| 1 | /* |
| 2 | * Copyright (c) Yann Collet, Meta Platforms, Inc. and affiliates. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This source code is licensed under both the BSD-style license (found in the |
| 6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| 7 | * in the COPYING file in the root directory of this source tree). |
| 8 | * You may select, at your option, one of the above-listed licenses. |
| 9 | */ |
| 10 | |
| 11 | |
| 12 | /*- Dependencies -*/ |
| 13 | #include <stddef.h> /* size_t, ptrdiff_t */ |
| 14 | #include <string.h> /* memcpy */ |
| 15 | #include <stdlib.h> /* malloc, free, qsort */ |
| 16 | |
| 17 | #ifndef XXH_STATIC_LINKING_ONLY |
| 18 | # define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */ |
| 19 | #endif |
| 20 | #include "../common/xxhash.h" /* XXH64_* */ |
| 21 | #include "zstd_v07.h" |
| 22 | |
| 23 | #define FSEv07_STATIC_LINKING_ONLY /* FSEv07_MIN_TABLELOG */ |
| 24 | #define HUFv07_STATIC_LINKING_ONLY /* HUFv07_TABLELOG_ABSOLUTEMAX */ |
| 25 | #define ZSTDv07_STATIC_LINKING_ONLY |
| 26 | |
| 27 | #include "../common/compiler.h" |
| 28 | #include "../common/error_private.h" |
| 29 | |
| 30 | |
| 31 | #ifdef ZSTDv07_STATIC_LINKING_ONLY |
| 32 | |
| 33 | /* ==================================================================================== |
| 34 | * The definitions in this section are considered experimental. |
| 35 | * They should never be used with a dynamic library, as they may change in the future. |
| 36 | * They are provided for advanced usages. |
| 37 | * Use them only in association with static linking. |
| 38 | * ==================================================================================== */ |
| 39 | |
| 40 | /*--- Constants ---*/ |
| 41 | #define ZSTDv07_MAGIC_SKIPPABLE_START 0x184D2A50U |
| 42 | |
| 43 | #define ZSTDv07_WINDOWLOG_MAX_32 25 |
| 44 | #define ZSTDv07_WINDOWLOG_MAX_64 27 |
| 45 | #define ZSTDv07_WINDOWLOG_MAX ((U32)(MEM_32bits() ? ZSTDv07_WINDOWLOG_MAX_32 : ZSTDv07_WINDOWLOG_MAX_64)) |
| 46 | #define ZSTDv07_WINDOWLOG_MIN 18 |
| 47 | #define ZSTDv07_CHAINLOG_MAX (ZSTDv07_WINDOWLOG_MAX+1) |
| 48 | #define ZSTDv07_CHAINLOG_MIN 4 |
| 49 | #define ZSTDv07_HASHLOG_MAX ZSTDv07_WINDOWLOG_MAX |
| 50 | #define ZSTDv07_HASHLOG_MIN 12 |
| 51 | #define ZSTDv07_HASHLOG3_MAX 17 |
| 52 | #define ZSTDv07_SEARCHLOG_MAX (ZSTDv07_WINDOWLOG_MAX-1) |
| 53 | #define ZSTDv07_SEARCHLOG_MIN 1 |
| 54 | #define ZSTDv07_SEARCHLENGTH_MAX 7 |
| 55 | #define ZSTDv07_SEARCHLENGTH_MIN 3 |
| 56 | #define ZSTDv07_TARGETLENGTH_MIN 4 |
| 57 | #define ZSTDv07_TARGETLENGTH_MAX 999 |
| 58 | |
| 59 | #define ZSTDv07_FRAMEHEADERSIZE_MAX 18 /* for static allocation */ |
| 60 | static const size_t ZSTDv07_frameHeaderSize_min = 5; |
| 61 | static const size_t ZSTDv07_frameHeaderSize_max = ZSTDv07_FRAMEHEADERSIZE_MAX; |
| 62 | static const size_t ZSTDv07_skippableHeaderSize = 8; /* magic number + skippable frame length */ |
| 63 | |
| 64 | |
| 65 | /* custom memory allocation functions */ |
| 66 | typedef void* (*ZSTDv07_allocFunction) (void* opaque, size_t size); |
| 67 | typedef void (*ZSTDv07_freeFunction) (void* opaque, void* address); |
| 68 | typedef struct { ZSTDv07_allocFunction customAlloc; ZSTDv07_freeFunction customFree; void* opaque; } ZSTDv07_customMem; |
| 69 | |
| 70 | |
| 71 | /*--- Advanced Decompression functions ---*/ |
| 72 | |
| 73 | /*! ZSTDv07_estimateDCtxSize() : |
| 74 | * Gives the potential amount of memory allocated to create a ZSTDv07_DCtx */ |
| 75 | ZSTDLIBv07_API size_t ZSTDv07_estimateDCtxSize(void); |
| 76 | |
| 77 | /*! ZSTDv07_createDCtx_advanced() : |
| 78 | * Create a ZSTD decompression context using external alloc and free functions */ |
| 79 | ZSTDLIBv07_API ZSTDv07_DCtx* ZSTDv07_createDCtx_advanced(ZSTDv07_customMem customMem); |
| 80 | |
| 81 | /*! ZSTDv07_sizeofDCtx() : |
| 82 | * Gives the amount of memory used by a given ZSTDv07_DCtx */ |
| 83 | ZSTDLIBv07_API size_t ZSTDv07_sizeofDCtx(const ZSTDv07_DCtx* dctx); |
| 84 | |
| 85 | |
| 86 | /* ****************************************************************** |
| 87 | * Buffer-less streaming functions (synchronous mode) |
| 88 | ********************************************************************/ |
| 89 | |
| 90 | ZSTDLIBv07_API size_t ZSTDv07_decompressBegin(ZSTDv07_DCtx* dctx); |
| 91 | ZSTDLIBv07_API size_t ZSTDv07_decompressBegin_usingDict(ZSTDv07_DCtx* dctx, const void* dict, size_t dictSize); |
| 92 | ZSTDLIBv07_API void ZSTDv07_copyDCtx(ZSTDv07_DCtx* dctx, const ZSTDv07_DCtx* preparedDCtx); |
| 93 | |
| 94 | ZSTDLIBv07_API size_t ZSTDv07_nextSrcSizeToDecompress(ZSTDv07_DCtx* dctx); |
| 95 | ZSTDLIBv07_API size_t ZSTDv07_decompressContinue(ZSTDv07_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); |
| 96 | |
| 97 | /* |
| 98 | Buffer-less streaming decompression (synchronous mode) |
| 99 | |
| 100 | A ZSTDv07_DCtx object is required to track streaming operations. |
| 101 | Use ZSTDv07_createDCtx() / ZSTDv07_freeDCtx() to manage it. |
| 102 | A ZSTDv07_DCtx object can be re-used multiple times. |
| 103 | |
| 104 | First optional operation is to retrieve frame parameters, using ZSTDv07_getFrameParams(), which doesn't consume the input. |
| 105 | It can provide the minimum size of rolling buffer required to properly decompress data (`windowSize`), |
| 106 | and optionally the final size of uncompressed content. |
| 107 | (Note : content size is an optional info that may not be present. 0 means : content size unknown) |
| 108 | Frame parameters are extracted from the beginning of compressed frame. |
| 109 | The amount of data to read is variable, from ZSTDv07_frameHeaderSize_min to ZSTDv07_frameHeaderSize_max (so if `srcSize` >= ZSTDv07_frameHeaderSize_max, it will always work) |
| 110 | If `srcSize` is too small for operation to succeed, function will return the minimum size it requires to produce a result. |
| 111 | Result : 0 when successful, it means the ZSTDv07_frameParams structure has been filled. |
| 112 | >0 : means there is not enough data into `src`. Provides the expected size to successfully decode header. |
| 113 | errorCode, which can be tested using ZSTDv07_isError() |
| 114 | |
| 115 | Start decompression, with ZSTDv07_decompressBegin() or ZSTDv07_decompressBegin_usingDict(). |
| 116 | Alternatively, you can copy a prepared context, using ZSTDv07_copyDCtx(). |
| 117 | |
| 118 | Then use ZSTDv07_nextSrcSizeToDecompress() and ZSTDv07_decompressContinue() alternatively. |
| 119 | ZSTDv07_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTDv07_decompressContinue(). |
| 120 | ZSTDv07_decompressContinue() requires this exact amount of bytes, or it will fail. |
| 121 | |
| 122 | @result of ZSTDv07_decompressContinue() is the number of bytes regenerated within 'dst' (necessarily <= dstCapacity). |
| 123 | It can be zero, which is not an error; it just means ZSTDv07_decompressContinue() has decoded some header. |
| 124 | |
| 125 | ZSTDv07_decompressContinue() needs previous data blocks during decompression, up to `windowSize`. |
| 126 | They should preferably be located contiguously, prior to current block. |
| 127 | Alternatively, a round buffer of sufficient size is also possible. Sufficient size is determined by frame parameters. |
| 128 | ZSTDv07_decompressContinue() is very sensitive to contiguity, |
| 129 | if 2 blocks don't follow each other, make sure that either the compressor breaks contiguity at the same place, |
| 130 | or that previous contiguous segment is large enough to properly handle maximum back-reference. |
| 131 | |
| 132 | A frame is fully decoded when ZSTDv07_nextSrcSizeToDecompress() returns zero. |
| 133 | Context can then be reset to start a new decompression. |
| 134 | |
| 135 | |
| 136 | == Special case : skippable frames == |
| 137 | |
| 138 | Skippable frames allow the integration of user-defined data into a flow of concatenated frames. |
| 139 | Skippable frames will be ignored (skipped) by a decompressor. The format of skippable frame is following: |
| 140 | a) Skippable frame ID - 4 Bytes, Little endian format, any value from 0x184D2A50 to 0x184D2A5F |
| 141 | b) Frame Size - 4 Bytes, Little endian format, unsigned 32-bits |
| 142 | c) Frame Content - any content (User Data) of length equal to Frame Size |
| 143 | For skippable frames ZSTDv07_decompressContinue() always returns 0. |
| 144 | For skippable frames ZSTDv07_getFrameParams() returns fparamsPtr->windowLog==0 what means that a frame is skippable. |
| 145 | It also returns Frame Size as fparamsPtr->frameContentSize. |
| 146 | */ |
| 147 | |
| 148 | |
| 149 | /* ************************************** |
| 150 | * Block functions |
| 151 | ****************************************/ |
| 152 | /*! Block functions produce and decode raw zstd blocks, without frame metadata. |
| 153 | Frame metadata cost is typically ~18 bytes, which can be non-negligible for very small blocks (< 100 bytes). |
| 154 | User will have to take in charge required information to regenerate data, such as compressed and content sizes. |
| 155 | |
| 156 | A few rules to respect : |
| 157 | - Compressing and decompressing require a context structure |
| 158 | + Use ZSTDv07_createCCtx() and ZSTDv07_createDCtx() |
| 159 | - It is necessary to init context before starting |
| 160 | + compression : ZSTDv07_compressBegin() |
| 161 | + decompression : ZSTDv07_decompressBegin() |
| 162 | + variants _usingDict() are also allowed |
| 163 | + copyCCtx() and copyDCtx() work too |
| 164 | - Block size is limited, it must be <= ZSTDv07_getBlockSizeMax() |
| 165 | + If you need to compress more, cut data into multiple blocks |
| 166 | + Consider using the regular ZSTDv07_compress() instead, as frame metadata costs become negligible when source size is large. |
| 167 | - When a block is considered not compressible enough, ZSTDv07_compressBlock() result will be zero. |
| 168 | In which case, nothing is produced into `dst`. |
| 169 | + User must test for such outcome and deal directly with uncompressed data |
| 170 | + ZSTDv07_decompressBlock() doesn't accept uncompressed data as input !!! |
| 171 | + In case of multiple successive blocks, decoder must be informed of uncompressed block existence to follow proper history. |
| 172 | Use ZSTDv07_insertBlock() in such a case. |
| 173 | */ |
| 174 | |
| 175 | #define ZSTDv07_BLOCKSIZE_ABSOLUTEMAX (128 * 1024) /* define, for static allocation */ |
| 176 | ZSTDLIBv07_API size_t ZSTDv07_decompressBlock(ZSTDv07_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); |
| 177 | ZSTDLIBv07_API size_t ZSTDv07_insertBlock(ZSTDv07_DCtx* dctx, const void* blockStart, size_t blockSize); /**< insert block into `dctx` history. Useful for uncompressed blocks */ |
| 178 | |
| 179 | |
| 180 | #endif /* ZSTDv07_STATIC_LINKING_ONLY */ |
| 181 | |
| 182 | |
| 183 | /* ****************************************************************** |
| 184 | mem.h |
| 185 | low-level memory access routines |
| 186 | Copyright (C) 2013-2015, Yann Collet. |
| 187 | |
| 188 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 189 | |
| 190 | Redistribution and use in source and binary forms, with or without |
| 191 | modification, are permitted provided that the following conditions are |
| 192 | met: |
| 193 | |
| 194 | * Redistributions of source code must retain the above copyright |
| 195 | notice, this list of conditions and the following disclaimer. |
| 196 | * Redistributions in binary form must reproduce the above |
| 197 | copyright notice, this list of conditions and the following disclaimer |
| 198 | in the documentation and/or other materials provided with the |
| 199 | distribution. |
| 200 | |
| 201 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 202 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 203 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 204 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 205 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 206 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 207 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 208 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 209 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 210 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 211 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 212 | |
| 213 | You can contact the author at : |
| 214 | - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 215 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 216 | ****************************************************************** */ |
| 217 | #ifndef MEM_H_MODULE |
| 218 | #define MEM_H_MODULE |
| 219 | |
| 220 | #if defined (__cplusplus) |
| 221 | extern "C" { |
| 222 | #endif |
| 223 | |
| 224 | /*-**************************************** |
| 225 | * Compiler specifics |
| 226 | ******************************************/ |
| 227 | #if defined(_MSC_VER) /* Visual Studio */ |
| 228 | # include <stdlib.h> /* _byteswap_ulong */ |
| 229 | # include <intrin.h> /* _byteswap_* */ |
| 230 | #endif |
| 231 | |
| 232 | |
| 233 | /*-************************************************************** |
| 234 | * Basic Types |
| 235 | *****************************************************************/ |
| 236 | #if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) ) |
| 237 | # if defined(_AIX) |
| 238 | # include <inttypes.h> |
| 239 | # else |
| 240 | # include <stdint.h> /* intptr_t */ |
| 241 | # endif |
| 242 | typedef uint8_t BYTE; |
| 243 | typedef uint16_t U16; |
| 244 | typedef int16_t S16; |
| 245 | typedef uint32_t U32; |
| 246 | typedef int32_t S32; |
| 247 | typedef uint64_t U64; |
| 248 | typedef int64_t S64; |
| 249 | #else |
| 250 | typedef unsigned char BYTE; |
| 251 | typedef unsigned short U16; |
| 252 | typedef signed short S16; |
| 253 | typedef unsigned int U32; |
| 254 | typedef signed int S32; |
| 255 | typedef unsigned long long U64; |
| 256 | typedef signed long long S64; |
| 257 | #endif |
| 258 | |
| 259 | |
| 260 | /*-************************************************************** |
| 261 | * Memory I/O |
| 262 | *****************************************************************/ |
| 263 | |
| 264 | MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t)==4; } |
| 265 | MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t)==8; } |
| 266 | |
| 267 | MEM_STATIC unsigned MEM_isLittleEndian(void) |
| 268 | { |
| 269 | const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ |
| 270 | return one.c[0]; |
| 271 | } |
| 272 | |
| 273 | MEM_STATIC U16 MEM_read16(const void* memPtr) |
| 274 | { |
| 275 | U16 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 276 | } |
| 277 | |
| 278 | MEM_STATIC U32 MEM_read32(const void* memPtr) |
| 279 | { |
| 280 | U32 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 281 | } |
| 282 | |
| 283 | MEM_STATIC U64 MEM_read64(const void* memPtr) |
| 284 | { |
| 285 | U64 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 286 | } |
| 287 | |
| 288 | MEM_STATIC void MEM_write16(void* memPtr, U16 value) |
| 289 | { |
| 290 | memcpy(memPtr, &value, sizeof(value)); |
| 291 | } |
| 292 | |
| 293 | MEM_STATIC U32 MEM_swap32(U32 in) |
| 294 | { |
| 295 | #if defined(_MSC_VER) /* Visual Studio */ |
| 296 | return _byteswap_ulong(in); |
| 297 | #elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403) |
| 298 | return __builtin_bswap32(in); |
| 299 | #else |
| 300 | return ((in << 24) & 0xff000000 ) | |
| 301 | ((in << 8) & 0x00ff0000 ) | |
| 302 | ((in >> 8) & 0x0000ff00 ) | |
| 303 | ((in >> 24) & 0x000000ff ); |
| 304 | #endif |
| 305 | } |
| 306 | |
| 307 | MEM_STATIC U64 MEM_swap64(U64 in) |
| 308 | { |
| 309 | #if defined(_MSC_VER) /* Visual Studio */ |
| 310 | return _byteswap_uint64(in); |
| 311 | #elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403) |
| 312 | return __builtin_bswap64(in); |
| 313 | #else |
| 314 | return ((in << 56) & 0xff00000000000000ULL) | |
| 315 | ((in << 40) & 0x00ff000000000000ULL) | |
| 316 | ((in << 24) & 0x0000ff0000000000ULL) | |
| 317 | ((in << 8) & 0x000000ff00000000ULL) | |
| 318 | ((in >> 8) & 0x00000000ff000000ULL) | |
| 319 | ((in >> 24) & 0x0000000000ff0000ULL) | |
| 320 | ((in >> 40) & 0x000000000000ff00ULL) | |
| 321 | ((in >> 56) & 0x00000000000000ffULL); |
| 322 | #endif |
| 323 | } |
| 324 | |
| 325 | |
| 326 | /*=== Little endian r/w ===*/ |
| 327 | |
| 328 | MEM_STATIC U16 MEM_readLE16(const void* memPtr) |
| 329 | { |
| 330 | if (MEM_isLittleEndian()) |
| 331 | return MEM_read16(memPtr); |
| 332 | else { |
| 333 | const BYTE* p = (const BYTE*)memPtr; |
| 334 | return (U16)(p[0] + (p[1]<<8)); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) |
| 339 | { |
| 340 | if (MEM_isLittleEndian()) { |
| 341 | MEM_write16(memPtr, val); |
| 342 | } else { |
| 343 | BYTE* p = (BYTE*)memPtr; |
| 344 | p[0] = (BYTE)val; |
| 345 | p[1] = (BYTE)(val>>8); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | MEM_STATIC U32 MEM_readLE32(const void* memPtr) |
| 350 | { |
| 351 | if (MEM_isLittleEndian()) |
| 352 | return MEM_read32(memPtr); |
| 353 | else |
| 354 | return MEM_swap32(MEM_read32(memPtr)); |
| 355 | } |
| 356 | |
| 357 | |
| 358 | MEM_STATIC U64 MEM_readLE64(const void* memPtr) |
| 359 | { |
| 360 | if (MEM_isLittleEndian()) |
| 361 | return MEM_read64(memPtr); |
| 362 | else |
| 363 | return MEM_swap64(MEM_read64(memPtr)); |
| 364 | } |
| 365 | |
| 366 | MEM_STATIC size_t MEM_readLEST(const void* memPtr) |
| 367 | { |
| 368 | if (MEM_32bits()) |
| 369 | return (size_t)MEM_readLE32(memPtr); |
| 370 | else |
| 371 | return (size_t)MEM_readLE64(memPtr); |
| 372 | } |
| 373 | |
| 374 | |
| 375 | |
| 376 | #if defined (__cplusplus) |
| 377 | } |
| 378 | #endif |
| 379 | |
| 380 | #endif /* MEM_H_MODULE */ |
| 381 | /* ****************************************************************** |
| 382 | bitstream |
| 383 | Part of FSE library |
| 384 | header file (to include) |
| 385 | Copyright (C) 2013-2016, Yann Collet. |
| 386 | |
| 387 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 388 | |
| 389 | Redistribution and use in source and binary forms, with or without |
| 390 | modification, are permitted provided that the following conditions are |
| 391 | met: |
| 392 | |
| 393 | * Redistributions of source code must retain the above copyright |
| 394 | notice, this list of conditions and the following disclaimer. |
| 395 | * Redistributions in binary form must reproduce the above |
| 396 | copyright notice, this list of conditions and the following disclaimer |
| 397 | in the documentation and/or other materials provided with the |
| 398 | distribution. |
| 399 | |
| 400 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 401 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 402 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 403 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 404 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 405 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 406 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 407 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 408 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 409 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 410 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 411 | |
| 412 | You can contact the author at : |
| 413 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 414 | ****************************************************************** */ |
| 415 | #ifndef BITSTREAM_H_MODULE |
| 416 | #define BITSTREAM_H_MODULE |
| 417 | |
| 418 | #if defined (__cplusplus) |
| 419 | extern "C" { |
| 420 | #endif |
| 421 | |
| 422 | |
| 423 | /* |
| 424 | * This API consists of small unitary functions, which must be inlined for best performance. |
| 425 | * Since link-time-optimization is not available for all compilers, |
| 426 | * these functions are defined into a .h to be included. |
| 427 | */ |
| 428 | |
| 429 | |
| 430 | /*========================================= |
| 431 | * Target specific |
| 432 | =========================================*/ |
| 433 | #if defined(__BMI__) && defined(__GNUC__) |
| 434 | # include <immintrin.h> /* support for bextr (experimental) */ |
| 435 | #endif |
| 436 | |
| 437 | /*-******************************************** |
| 438 | * bitStream decoding API (read backward) |
| 439 | **********************************************/ |
| 440 | typedef struct |
| 441 | { |
| 442 | size_t bitContainer; |
| 443 | unsigned bitsConsumed; |
| 444 | const char* ptr; |
| 445 | const char* start; |
| 446 | } BITv07_DStream_t; |
| 447 | |
| 448 | typedef enum { BITv07_DStream_unfinished = 0, |
| 449 | BITv07_DStream_endOfBuffer = 1, |
| 450 | BITv07_DStream_completed = 2, |
| 451 | BITv07_DStream_overflow = 3 } BITv07_DStream_status; /* result of BITv07_reloadDStream() */ |
| 452 | /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ |
| 453 | |
| 454 | MEM_STATIC size_t BITv07_initDStream(BITv07_DStream_t* bitD, const void* srcBuffer, size_t srcSize); |
| 455 | MEM_STATIC size_t BITv07_readBits(BITv07_DStream_t* bitD, unsigned nbBits); |
| 456 | MEM_STATIC BITv07_DStream_status BITv07_reloadDStream(BITv07_DStream_t* bitD); |
| 457 | MEM_STATIC unsigned BITv07_endOfDStream(const BITv07_DStream_t* bitD); |
| 458 | |
| 459 | |
| 460 | |
| 461 | /*-**************************************** |
| 462 | * unsafe API |
| 463 | ******************************************/ |
| 464 | MEM_STATIC size_t BITv07_readBitsFast(BITv07_DStream_t* bitD, unsigned nbBits); |
| 465 | /* faster, but works only if nbBits >= 1 */ |
| 466 | |
| 467 | |
| 468 | |
| 469 | /*-************************************************************** |
| 470 | * Internal functions |
| 471 | ****************************************************************/ |
| 472 | MEM_STATIC unsigned BITv07_highbit32 (U32 val) |
| 473 | { |
| 474 | # if defined(_MSC_VER) /* Visual */ |
| 475 | unsigned long r; |
| 476 | return _BitScanReverse(&r, val) ? (unsigned)r : 0; |
| 477 | # elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ |
| 478 | return __builtin_clz (val) ^ 31; |
| 479 | # else /* Software version */ |
| 480 | static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; |
| 481 | U32 v = val; |
| 482 | v |= v >> 1; |
| 483 | v |= v >> 2; |
| 484 | v |= v >> 4; |
| 485 | v |= v >> 8; |
| 486 | v |= v >> 16; |
| 487 | return DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; |
| 488 | # endif |
| 489 | } |
| 490 | |
| 491 | |
| 492 | |
| 493 | /*-******************************************************** |
| 494 | * bitStream decoding |
| 495 | **********************************************************/ |
| 496 | /*! BITv07_initDStream() : |
| 497 | * Initialize a BITv07_DStream_t. |
| 498 | * `bitD` : a pointer to an already allocated BITv07_DStream_t structure. |
| 499 | * `srcSize` must be the *exact* size of the bitStream, in bytes. |
| 500 | * @return : size of stream (== srcSize) or an errorCode if a problem is detected |
| 501 | */ |
| 502 | MEM_STATIC size_t BITv07_initDStream(BITv07_DStream_t* bitD, const void* srcBuffer, size_t srcSize) |
| 503 | { |
| 504 | if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } |
| 505 | |
| 506 | if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */ |
| 507 | bitD->start = (const char*)srcBuffer; |
| 508 | bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer); |
| 509 | bitD->bitContainer = MEM_readLEST(bitD->ptr); |
| 510 | { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; |
| 511 | bitD->bitsConsumed = lastByte ? 8 - BITv07_highbit32(lastByte) : 0; |
| 512 | if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ } |
| 513 | } else { |
| 514 | bitD->start = (const char*)srcBuffer; |
| 515 | bitD->ptr = bitD->start; |
| 516 | bitD->bitContainer = *(const BYTE*)(bitD->start); |
| 517 | switch(srcSize) |
| 518 | { |
| 519 | case 7: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[6]) << (sizeof(bitD->bitContainer)*8 - 16);/* fall-through */ |
| 520 | case 6: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[5]) << (sizeof(bitD->bitContainer)*8 - 24);/* fall-through */ |
| 521 | case 5: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[4]) << (sizeof(bitD->bitContainer)*8 - 32);/* fall-through */ |
| 522 | case 4: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[3]) << 24; /* fall-through */ |
| 523 | case 3: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[2]) << 16; /* fall-through */ |
| 524 | case 2: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[1]) << 8; /* fall-through */ |
| 525 | default: break; |
| 526 | } |
| 527 | { BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1]; |
| 528 | bitD->bitsConsumed = lastByte ? 8 - BITv07_highbit32(lastByte) : 0; |
| 529 | if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ } |
| 530 | bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize)*8; |
| 531 | } |
| 532 | |
| 533 | return srcSize; |
| 534 | } |
| 535 | |
| 536 | |
| 537 | MEM_STATIC size_t BITv07_lookBits(const BITv07_DStream_t* bitD, U32 nbBits) |
| 538 | { |
| 539 | U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1; |
| 540 | return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); |
| 541 | } |
| 542 | |
| 543 | /*! BITv07_lookBitsFast() : |
| 544 | * unsafe version; only works if nbBits >= 1 */ |
| 545 | MEM_STATIC size_t BITv07_lookBitsFast(const BITv07_DStream_t* bitD, U32 nbBits) |
| 546 | { |
| 547 | U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1; |
| 548 | return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); |
| 549 | } |
| 550 | |
| 551 | MEM_STATIC void BITv07_skipBits(BITv07_DStream_t* bitD, U32 nbBits) |
| 552 | { |
| 553 | bitD->bitsConsumed += nbBits; |
| 554 | } |
| 555 | |
| 556 | MEM_STATIC size_t BITv07_readBits(BITv07_DStream_t* bitD, U32 nbBits) |
| 557 | { |
| 558 | size_t const value = BITv07_lookBits(bitD, nbBits); |
| 559 | BITv07_skipBits(bitD, nbBits); |
| 560 | return value; |
| 561 | } |
| 562 | |
| 563 | /*! BITv07_readBitsFast() : |
| 564 | * unsafe version; only works if nbBits >= 1 */ |
| 565 | MEM_STATIC size_t BITv07_readBitsFast(BITv07_DStream_t* bitD, U32 nbBits) |
| 566 | { |
| 567 | size_t const value = BITv07_lookBitsFast(bitD, nbBits); |
| 568 | BITv07_skipBits(bitD, nbBits); |
| 569 | return value; |
| 570 | } |
| 571 | |
| 572 | MEM_STATIC BITv07_DStream_status BITv07_reloadDStream(BITv07_DStream_t* bitD) |
| 573 | { |
| 574 | if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should not happen => corruption detected */ |
| 575 | return BITv07_DStream_overflow; |
| 576 | |
| 577 | if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) { |
| 578 | bitD->ptr -= bitD->bitsConsumed >> 3; |
| 579 | bitD->bitsConsumed &= 7; |
| 580 | bitD->bitContainer = MEM_readLEST(bitD->ptr); |
| 581 | return BITv07_DStream_unfinished; |
| 582 | } |
| 583 | if (bitD->ptr == bitD->start) { |
| 584 | if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BITv07_DStream_endOfBuffer; |
| 585 | return BITv07_DStream_completed; |
| 586 | } |
| 587 | { U32 nbBytes = bitD->bitsConsumed >> 3; |
| 588 | BITv07_DStream_status result = BITv07_DStream_unfinished; |
| 589 | if (bitD->ptr - nbBytes < bitD->start) { |
| 590 | nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ |
| 591 | result = BITv07_DStream_endOfBuffer; |
| 592 | } |
| 593 | bitD->ptr -= nbBytes; |
| 594 | bitD->bitsConsumed -= nbBytes*8; |
| 595 | bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ |
| 596 | return result; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | /*! BITv07_endOfDStream() : |
| 601 | * @return Tells if DStream has exactly reached its end (all bits consumed). |
| 602 | */ |
| 603 | MEM_STATIC unsigned BITv07_endOfDStream(const BITv07_DStream_t* DStream) |
| 604 | { |
| 605 | return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); |
| 606 | } |
| 607 | |
| 608 | #if defined (__cplusplus) |
| 609 | } |
| 610 | #endif |
| 611 | |
| 612 | #endif /* BITSTREAM_H_MODULE */ |
| 613 | /* ****************************************************************** |
| 614 | FSE : Finite State Entropy codec |
| 615 | Public Prototypes declaration |
| 616 | Copyright (C) 2013-2016, Yann Collet. |
| 617 | |
| 618 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 619 | |
| 620 | Redistribution and use in source and binary forms, with or without |
| 621 | modification, are permitted provided that the following conditions are |
| 622 | met: |
| 623 | |
| 624 | * Redistributions of source code must retain the above copyright |
| 625 | notice, this list of conditions and the following disclaimer. |
| 626 | * Redistributions in binary form must reproduce the above |
| 627 | copyright notice, this list of conditions and the following disclaimer |
| 628 | in the documentation and/or other materials provided with the |
| 629 | distribution. |
| 630 | |
| 631 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 632 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 633 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 634 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 635 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 636 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 637 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 638 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 639 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 640 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 641 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 642 | |
| 643 | You can contact the author at : |
| 644 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 645 | ****************************************************************** */ |
| 646 | #ifndef FSEv07_H |
| 647 | #define FSEv07_H |
| 648 | |
| 649 | #if defined (__cplusplus) |
| 650 | extern "C" { |
| 651 | #endif |
| 652 | |
| 653 | |
| 654 | |
| 655 | /*-**************************************** |
| 656 | * FSE simple functions |
| 657 | ******************************************/ |
| 658 | |
| 659 | /*! FSEv07_decompress(): |
| 660 | Decompress FSE data from buffer 'cSrc', of size 'cSrcSize', |
| 661 | into already allocated destination buffer 'dst', of size 'dstCapacity'. |
| 662 | @return : size of regenerated data (<= maxDstSize), |
| 663 | or an error code, which can be tested using FSEv07_isError() . |
| 664 | |
| 665 | ** Important ** : FSEv07_decompress() does not decompress non-compressible nor RLE data !!! |
| 666 | Why ? : making this distinction requires a header. |
| 667 | Header management is intentionally delegated to the user layer, which can better manage special cases. |
| 668 | */ |
| 669 | size_t FSEv07_decompress(void* dst, size_t dstCapacity, |
| 670 | const void* cSrc, size_t cSrcSize); |
| 671 | |
| 672 | |
| 673 | /* Error Management */ |
| 674 | unsigned FSEv07_isError(size_t code); /* tells if a return value is an error code */ |
| 675 | const char* FSEv07_getErrorName(size_t code); /* provides error code string (useful for debugging) */ |
| 676 | |
| 677 | |
| 678 | /*-***************************************** |
| 679 | * FSE detailed API |
| 680 | ******************************************/ |
| 681 | /*! |
| 682 | FSEv07_decompress() does the following: |
| 683 | 1. read normalized counters with readNCount() |
| 684 | 2. build decoding table 'DTable' from normalized counters |
| 685 | 3. decode the data stream using decoding table 'DTable' |
| 686 | |
| 687 | The following API allows targeting specific sub-functions for advanced tasks. |
| 688 | For example, it's possible to compress several blocks using the same 'CTable', |
| 689 | or to save and provide normalized distribution using external method. |
| 690 | */ |
| 691 | |
| 692 | |
| 693 | /* *** DECOMPRESSION *** */ |
| 694 | |
| 695 | /*! FSEv07_readNCount(): |
| 696 | Read compactly saved 'normalizedCounter' from 'rBuffer'. |
| 697 | @return : size read from 'rBuffer', |
| 698 | or an errorCode, which can be tested using FSEv07_isError(). |
| 699 | maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */ |
| 700 | size_t FSEv07_readNCount (short* normalizedCounter, unsigned* maxSymbolValuePtr, unsigned* tableLogPtr, const void* rBuffer, size_t rBuffSize); |
| 701 | |
| 702 | /*! Constructor and Destructor of FSEv07_DTable. |
| 703 | Note that its size depends on 'tableLog' */ |
| 704 | typedef unsigned FSEv07_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ |
| 705 | FSEv07_DTable* FSEv07_createDTable(unsigned tableLog); |
| 706 | void FSEv07_freeDTable(FSEv07_DTable* dt); |
| 707 | |
| 708 | /*! FSEv07_buildDTable(): |
| 709 | Builds 'dt', which must be already allocated, using FSEv07_createDTable(). |
| 710 | return : 0, or an errorCode, which can be tested using FSEv07_isError() */ |
| 711 | size_t FSEv07_buildDTable (FSEv07_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); |
| 712 | |
| 713 | /*! FSEv07_decompress_usingDTable(): |
| 714 | Decompress compressed source `cSrc` of size `cSrcSize` using `dt` |
| 715 | into `dst` which must be already allocated. |
| 716 | @return : size of regenerated data (necessarily <= `dstCapacity`), |
| 717 | or an errorCode, which can be tested using FSEv07_isError() */ |
| 718 | size_t FSEv07_decompress_usingDTable(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, const FSEv07_DTable* dt); |
| 719 | |
| 720 | /*! |
| 721 | Tutorial : |
| 722 | ---------- |
| 723 | (Note : these functions only decompress FSE-compressed blocks. |
| 724 | If block is uncompressed, use memcpy() instead |
| 725 | If block is a single repeated byte, use memset() instead ) |
| 726 | |
| 727 | The first step is to obtain the normalized frequencies of symbols. |
| 728 | This can be performed by FSEv07_readNCount() if it was saved using FSEv07_writeNCount(). |
| 729 | 'normalizedCounter' must be already allocated, and have at least 'maxSymbolValuePtr[0]+1' cells of signed short. |
| 730 | In practice, that means it's necessary to know 'maxSymbolValue' beforehand, |
| 731 | or size the table to handle worst case situations (typically 256). |
| 732 | FSEv07_readNCount() will provide 'tableLog' and 'maxSymbolValue'. |
| 733 | The result of FSEv07_readNCount() is the number of bytes read from 'rBuffer'. |
| 734 | Note that 'rBufferSize' must be at least 4 bytes, even if useful information is less than that. |
| 735 | If there is an error, the function will return an error code, which can be tested using FSEv07_isError(). |
| 736 | |
| 737 | The next step is to build the decompression tables 'FSEv07_DTable' from 'normalizedCounter'. |
| 738 | This is performed by the function FSEv07_buildDTable(). |
| 739 | The space required by 'FSEv07_DTable' must be already allocated using FSEv07_createDTable(). |
| 740 | If there is an error, the function will return an error code, which can be tested using FSEv07_isError(). |
| 741 | |
| 742 | `FSEv07_DTable` can then be used to decompress `cSrc`, with FSEv07_decompress_usingDTable(). |
| 743 | `cSrcSize` must be strictly correct, otherwise decompression will fail. |
| 744 | FSEv07_decompress_usingDTable() result will tell how many bytes were regenerated (<=`dstCapacity`). |
| 745 | If there is an error, the function will return an error code, which can be tested using FSEv07_isError(). (ex: dst buffer too small) |
| 746 | */ |
| 747 | |
| 748 | |
| 749 | #ifdef FSEv07_STATIC_LINKING_ONLY |
| 750 | |
| 751 | |
| 752 | /* ***************************************** |
| 753 | * Static allocation |
| 754 | *******************************************/ |
| 755 | /* FSE buffer bounds */ |
| 756 | #define FSEv07_NCOUNTBOUND 512 |
| 757 | #define FSEv07_BLOCKBOUND(size) (size + (size>>7)) |
| 758 | |
| 759 | /* It is possible to statically allocate FSE CTable/DTable as a table of unsigned using below macros */ |
| 760 | #define FSEv07_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog)) |
| 761 | |
| 762 | |
| 763 | /* ***************************************** |
| 764 | * FSE advanced API |
| 765 | *******************************************/ |
| 766 | size_t FSEv07_countFast(unsigned* count, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize); |
| 767 | /**< same as FSEv07_count(), but blindly trusts that all byte values within src are <= *maxSymbolValuePtr */ |
| 768 | |
| 769 | unsigned FSEv07_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus); |
| 770 | /**< same as FSEv07_optimalTableLog(), which used `minus==2` */ |
| 771 | |
| 772 | size_t FSEv07_buildDTable_raw (FSEv07_DTable* dt, unsigned nbBits); |
| 773 | /**< build a fake FSEv07_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */ |
| 774 | |
| 775 | size_t FSEv07_buildDTable_rle (FSEv07_DTable* dt, unsigned char symbolValue); |
| 776 | /**< build a fake FSEv07_DTable, designed to always generate the same symbolValue */ |
| 777 | |
| 778 | |
| 779 | |
| 780 | /* ***************************************** |
| 781 | * FSE symbol decompression API |
| 782 | *******************************************/ |
| 783 | typedef struct |
| 784 | { |
| 785 | size_t state; |
| 786 | const void* table; /* precise table may vary, depending on U16 */ |
| 787 | } FSEv07_DState_t; |
| 788 | |
| 789 | |
| 790 | static void FSEv07_initDState(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD, const FSEv07_DTable* dt); |
| 791 | |
| 792 | static unsigned char FSEv07_decodeSymbol(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD); |
| 793 | |
| 794 | |
| 795 | |
| 796 | /* ***************************************** |
| 797 | * FSE unsafe API |
| 798 | *******************************************/ |
| 799 | static unsigned char FSEv07_decodeSymbolFast(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD); |
| 800 | /* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */ |
| 801 | |
| 802 | |
| 803 | /* ====== Decompression ====== */ |
| 804 | |
| 805 | typedef struct { |
| 806 | U16 tableLog; |
| 807 | U16 fastMode; |
| 808 | } FSEv07_DTableHeader; /* sizeof U32 */ |
| 809 | |
| 810 | typedef struct |
| 811 | { |
| 812 | unsigned short newState; |
| 813 | unsigned char symbol; |
| 814 | unsigned char nbBits; |
| 815 | } FSEv07_decode_t; /* size == U32 */ |
| 816 | |
| 817 | MEM_STATIC void FSEv07_initDState(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD, const FSEv07_DTable* dt) |
| 818 | { |
| 819 | const void* ptr = dt; |
| 820 | const FSEv07_DTableHeader* const DTableH = (const FSEv07_DTableHeader*)ptr; |
| 821 | DStatePtr->state = BITv07_readBits(bitD, DTableH->tableLog); |
| 822 | BITv07_reloadDStream(bitD); |
| 823 | DStatePtr->table = dt + 1; |
| 824 | } |
| 825 | |
| 826 | MEM_STATIC BYTE FSEv07_peekSymbol(const FSEv07_DState_t* DStatePtr) |
| 827 | { |
| 828 | FSEv07_decode_t const DInfo = ((const FSEv07_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 829 | return DInfo.symbol; |
| 830 | } |
| 831 | |
| 832 | MEM_STATIC void FSEv07_updateState(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD) |
| 833 | { |
| 834 | FSEv07_decode_t const DInfo = ((const FSEv07_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 835 | U32 const nbBits = DInfo.nbBits; |
| 836 | size_t const lowBits = BITv07_readBits(bitD, nbBits); |
| 837 | DStatePtr->state = DInfo.newState + lowBits; |
| 838 | } |
| 839 | |
| 840 | MEM_STATIC BYTE FSEv07_decodeSymbol(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD) |
| 841 | { |
| 842 | FSEv07_decode_t const DInfo = ((const FSEv07_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 843 | U32 const nbBits = DInfo.nbBits; |
| 844 | BYTE const symbol = DInfo.symbol; |
| 845 | size_t const lowBits = BITv07_readBits(bitD, nbBits); |
| 846 | |
| 847 | DStatePtr->state = DInfo.newState + lowBits; |
| 848 | return symbol; |
| 849 | } |
| 850 | |
| 851 | /*! FSEv07_decodeSymbolFast() : |
| 852 | unsafe, only works if no symbol has a probability > 50% */ |
| 853 | MEM_STATIC BYTE FSEv07_decodeSymbolFast(FSEv07_DState_t* DStatePtr, BITv07_DStream_t* bitD) |
| 854 | { |
| 855 | FSEv07_decode_t const DInfo = ((const FSEv07_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 856 | U32 const nbBits = DInfo.nbBits; |
| 857 | BYTE const symbol = DInfo.symbol; |
| 858 | size_t const lowBits = BITv07_readBitsFast(bitD, nbBits); |
| 859 | |
| 860 | DStatePtr->state = DInfo.newState + lowBits; |
| 861 | return symbol; |
| 862 | } |
| 863 | |
| 864 | |
| 865 | |
| 866 | #ifndef FSEv07_COMMONDEFS_ONLY |
| 867 | |
| 868 | /* ************************************************************** |
| 869 | * Tuning parameters |
| 870 | ****************************************************************/ |
| 871 | /*!MEMORY_USAGE : |
| 872 | * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) |
| 873 | * Increasing memory usage improves compression ratio |
| 874 | * Reduced memory usage can improve speed, due to cache effect |
| 875 | * Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ |
| 876 | #define FSEv07_MAX_MEMORY_USAGE 14 |
| 877 | #define FSEv07_DEFAULT_MEMORY_USAGE 13 |
| 878 | |
| 879 | /*!FSEv07_MAX_SYMBOL_VALUE : |
| 880 | * Maximum symbol value authorized. |
| 881 | * Required for proper stack allocation */ |
| 882 | #define FSEv07_MAX_SYMBOL_VALUE 255 |
| 883 | |
| 884 | |
| 885 | /* ************************************************************** |
| 886 | * template functions type & suffix |
| 887 | ****************************************************************/ |
| 888 | #define FSEv07_FUNCTION_TYPE BYTE |
| 889 | #define FSEv07_FUNCTION_EXTENSION |
| 890 | #define FSEv07_DECODE_TYPE FSEv07_decode_t |
| 891 | |
| 892 | |
| 893 | #endif /* !FSEv07_COMMONDEFS_ONLY */ |
| 894 | |
| 895 | |
| 896 | /* *************************************************************** |
| 897 | * Constants |
| 898 | *****************************************************************/ |
| 899 | #define FSEv07_MAX_TABLELOG (FSEv07_MAX_MEMORY_USAGE-2) |
| 900 | #define FSEv07_MAX_TABLESIZE (1U<<FSEv07_MAX_TABLELOG) |
| 901 | #define FSEv07_MAXTABLESIZE_MASK (FSEv07_MAX_TABLESIZE-1) |
| 902 | #define FSEv07_DEFAULT_TABLELOG (FSEv07_DEFAULT_MEMORY_USAGE-2) |
| 903 | #define FSEv07_MIN_TABLELOG 5 |
| 904 | |
| 905 | #define FSEv07_TABLELOG_ABSOLUTE_MAX 15 |
| 906 | #if FSEv07_MAX_TABLELOG > FSEv07_TABLELOG_ABSOLUTE_MAX |
| 907 | # error "FSEv07_MAX_TABLELOG > FSEv07_TABLELOG_ABSOLUTE_MAX is not supported" |
| 908 | #endif |
| 909 | |
| 910 | #define FSEv07_TABLESTEP(tableSize) ((tableSize>>1) + (tableSize>>3) + 3) |
| 911 | |
| 912 | |
| 913 | #endif /* FSEv07_STATIC_LINKING_ONLY */ |
| 914 | |
| 915 | |
| 916 | #if defined (__cplusplus) |
| 917 | } |
| 918 | #endif |
| 919 | |
| 920 | #endif /* FSEv07_H */ |
| 921 | /* ****************************************************************** |
| 922 | Huffman coder, part of New Generation Entropy library |
| 923 | header file |
| 924 | Copyright (C) 2013-2016, Yann Collet. |
| 925 | |
| 926 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 927 | |
| 928 | Redistribution and use in source and binary forms, with or without |
| 929 | modification, are permitted provided that the following conditions are |
| 930 | met: |
| 931 | |
| 932 | * Redistributions of source code must retain the above copyright |
| 933 | notice, this list of conditions and the following disclaimer. |
| 934 | * Redistributions in binary form must reproduce the above |
| 935 | copyright notice, this list of conditions and the following disclaimer |
| 936 | in the documentation and/or other materials provided with the |
| 937 | distribution. |
| 938 | |
| 939 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 940 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 941 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 942 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 943 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 944 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 945 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 946 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 947 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 948 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 949 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 950 | |
| 951 | You can contact the author at : |
| 952 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 953 | ****************************************************************** */ |
| 954 | #ifndef HUFv07_H_298734234 |
| 955 | #define HUFv07_H_298734234 |
| 956 | |
| 957 | #if defined (__cplusplus) |
| 958 | extern "C" { |
| 959 | #endif |
| 960 | |
| 961 | |
| 962 | |
| 963 | /* *** simple functions *** */ |
| 964 | /** |
| 965 | HUFv07_decompress() : |
| 966 | Decompress HUF data from buffer 'cSrc', of size 'cSrcSize', |
| 967 | into already allocated buffer 'dst', of minimum size 'dstSize'. |
| 968 | `dstSize` : **must** be the ***exact*** size of original (uncompressed) data. |
| 969 | Note : in contrast with FSE, HUFv07_decompress can regenerate |
| 970 | RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, |
| 971 | because it knows size to regenerate. |
| 972 | @return : size of regenerated data (== dstSize), |
| 973 | or an error code, which can be tested using HUFv07_isError() |
| 974 | */ |
| 975 | size_t HUFv07_decompress(void* dst, size_t dstSize, |
| 976 | const void* cSrc, size_t cSrcSize); |
| 977 | |
| 978 | |
| 979 | /* **************************************** |
| 980 | * Tool functions |
| 981 | ******************************************/ |
| 982 | #define HUFv07_BLOCKSIZE_MAX (128 * 1024) |
| 983 | |
| 984 | /* Error Management */ |
| 985 | unsigned HUFv07_isError(size_t code); /**< tells if a return value is an error code */ |
| 986 | const char* HUFv07_getErrorName(size_t code); /**< provides error code string (useful for debugging) */ |
| 987 | |
| 988 | |
| 989 | /* *** Advanced function *** */ |
| 990 | |
| 991 | |
| 992 | #ifdef HUFv07_STATIC_LINKING_ONLY |
| 993 | |
| 994 | |
| 995 | /* *** Constants *** */ |
| 996 | #define HUFv07_TABLELOG_ABSOLUTEMAX 16 /* absolute limit of HUFv07_MAX_TABLELOG. Beyond that value, code does not work */ |
| 997 | #define HUFv07_TABLELOG_MAX 12 /* max configured tableLog (for static allocation); can be modified up to HUFv07_ABSOLUTEMAX_TABLELOG */ |
| 998 | #define HUFv07_TABLELOG_DEFAULT 11 /* tableLog by default, when not specified */ |
| 999 | #define HUFv07_SYMBOLVALUE_MAX 255 |
| 1000 | #if (HUFv07_TABLELOG_MAX > HUFv07_TABLELOG_ABSOLUTEMAX) |
| 1001 | # error "HUFv07_TABLELOG_MAX is too large !" |
| 1002 | #endif |
| 1003 | |
| 1004 | |
| 1005 | /* **************************************** |
| 1006 | * Static allocation |
| 1007 | ******************************************/ |
| 1008 | /* HUF buffer bounds */ |
| 1009 | #define HUFv07_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */ |
| 1010 | |
| 1011 | /* static allocation of HUF's DTable */ |
| 1012 | typedef U32 HUFv07_DTable; |
| 1013 | #define HUFv07_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog))) |
| 1014 | #define HUFv07_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ |
| 1015 | HUFv07_DTable DTable[HUFv07_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1)*0x1000001) } |
| 1016 | #define HUFv07_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \ |
| 1017 | HUFv07_DTable DTable[HUFv07_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog)*0x1000001) } |
| 1018 | |
| 1019 | |
| 1020 | /* **************************************** |
| 1021 | * Advanced decompression functions |
| 1022 | ******************************************/ |
| 1023 | size_t HUFv07_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ |
| 1024 | size_t HUFv07_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ |
| 1025 | |
| 1026 | size_t HUFv07_decompress4X_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< decodes RLE and uncompressed */ |
| 1027 | size_t HUFv07_decompress4X_hufOnly(HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< considers RLE and uncompressed as errors */ |
| 1028 | size_t HUFv07_decompress4X2_DCtx(HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ |
| 1029 | size_t HUFv07_decompress4X4_DCtx(HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ |
| 1030 | |
| 1031 | size_t HUFv07_decompress1X_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); |
| 1032 | size_t HUFv07_decompress1X2_DCtx(HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */ |
| 1033 | size_t HUFv07_decompress1X4_DCtx(HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */ |
| 1034 | |
| 1035 | |
| 1036 | /* **************************************** |
| 1037 | * HUF detailed API |
| 1038 | ******************************************/ |
| 1039 | /*! |
| 1040 | The following API allows targeting specific sub-functions for advanced tasks. |
| 1041 | For example, it's possible to compress several blocks using the same 'CTable', |
| 1042 | or to save and regenerate 'CTable' using external methods. |
| 1043 | */ |
| 1044 | /* FSEv07_count() : find it within "fse.h" */ |
| 1045 | |
| 1046 | /*! HUFv07_readStats() : |
| 1047 | Read compact Huffman tree, saved by HUFv07_writeCTable(). |
| 1048 | `huffWeight` is destination buffer. |
| 1049 | @return : size read from `src` , or an error Code . |
| 1050 | Note : Needed by HUFv07_readCTable() and HUFv07_readDTableXn() . */ |
| 1051 | size_t HUFv07_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, |
| 1052 | U32* nbSymbolsPtr, U32* tableLogPtr, |
| 1053 | const void* src, size_t srcSize); |
| 1054 | |
| 1055 | |
| 1056 | /* |
| 1057 | HUFv07_decompress() does the following: |
| 1058 | 1. select the decompression algorithm (X2, X4) based on pre-computed heuristics |
| 1059 | 2. build Huffman table from save, using HUFv07_readDTableXn() |
| 1060 | 3. decode 1 or 4 segments in parallel using HUFv07_decompressSXn_usingDTable |
| 1061 | */ |
| 1062 | |
| 1063 | /** HUFv07_selectDecoder() : |
| 1064 | * Tells which decoder is likely to decode faster, |
| 1065 | * based on a set of pre-determined metrics. |
| 1066 | * @return : 0==HUFv07_decompress4X2, 1==HUFv07_decompress4X4 . |
| 1067 | * Assumption : 0 < cSrcSize < dstSize <= 128 KB */ |
| 1068 | U32 HUFv07_selectDecoder (size_t dstSize, size_t cSrcSize); |
| 1069 | |
| 1070 | size_t HUFv07_readDTableX2 (HUFv07_DTable* DTable, const void* src, size_t srcSize); |
| 1071 | size_t HUFv07_readDTableX4 (HUFv07_DTable* DTable, const void* src, size_t srcSize); |
| 1072 | |
| 1073 | size_t HUFv07_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1074 | size_t HUFv07_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1075 | size_t HUFv07_decompress4X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1076 | |
| 1077 | |
| 1078 | /* single stream variants */ |
| 1079 | size_t HUFv07_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ |
| 1080 | size_t HUFv07_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */ |
| 1081 | |
| 1082 | size_t HUFv07_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1083 | size_t HUFv07_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1084 | size_t HUFv07_decompress1X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUFv07_DTable* DTable); |
| 1085 | |
| 1086 | |
| 1087 | #endif /* HUFv07_STATIC_LINKING_ONLY */ |
| 1088 | |
| 1089 | |
| 1090 | #if defined (__cplusplus) |
| 1091 | } |
| 1092 | #endif |
| 1093 | |
| 1094 | #endif /* HUFv07_H_298734234 */ |
| 1095 | /* |
| 1096 | Common functions of New Generation Entropy library |
| 1097 | Copyright (C) 2016, Yann Collet. |
| 1098 | |
| 1099 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 1100 | |
| 1101 | Redistribution and use in source and binary forms, with or without |
| 1102 | modification, are permitted provided that the following conditions are |
| 1103 | met: |
| 1104 | |
| 1105 | * Redistributions of source code must retain the above copyright |
| 1106 | notice, this list of conditions and the following disclaimer. |
| 1107 | * Redistributions in binary form must reproduce the above |
| 1108 | copyright notice, this list of conditions and the following disclaimer |
| 1109 | in the documentation and/or other materials provided with the |
| 1110 | distribution. |
| 1111 | |
| 1112 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 1113 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 1114 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 1115 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 1116 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 1117 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 1118 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 1119 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 1120 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 1121 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 1122 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 1123 | |
| 1124 | You can contact the author at : |
| 1125 | - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 1126 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 1127 | *************************************************************************** */ |
| 1128 | |
| 1129 | |
| 1130 | |
| 1131 | /*-**************************************** |
| 1132 | * FSE Error Management |
| 1133 | ******************************************/ |
| 1134 | unsigned FSEv07_isError(size_t code) { return ERR_isError(code); } |
| 1135 | |
| 1136 | const char* FSEv07_getErrorName(size_t code) { return ERR_getErrorName(code); } |
| 1137 | |
| 1138 | |
| 1139 | /* ************************************************************** |
| 1140 | * HUF Error Management |
| 1141 | ****************************************************************/ |
| 1142 | unsigned HUFv07_isError(size_t code) { return ERR_isError(code); } |
| 1143 | |
| 1144 | const char* HUFv07_getErrorName(size_t code) { return ERR_getErrorName(code); } |
| 1145 | |
| 1146 | |
| 1147 | /*-************************************************************** |
| 1148 | * FSE NCount encoding-decoding |
| 1149 | ****************************************************************/ |
| 1150 | static short FSEv07_abs(short a) { return (short)(a<0 ? -a : a); } |
| 1151 | |
| 1152 | size_t FSEv07_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, |
| 1153 | const void* headerBuffer, size_t hbSize) |
| 1154 | { |
| 1155 | const BYTE* const istart = (const BYTE*) headerBuffer; |
| 1156 | const BYTE* const iend = istart + hbSize; |
| 1157 | const BYTE* ip = istart; |
| 1158 | int nbBits; |
| 1159 | int remaining; |
| 1160 | int threshold; |
| 1161 | U32 bitStream; |
| 1162 | int bitCount; |
| 1163 | unsigned charnum = 0; |
| 1164 | int previous0 = 0; |
| 1165 | |
| 1166 | if (hbSize < 4) return ERROR(srcSize_wrong); |
| 1167 | bitStream = MEM_readLE32(ip); |
| 1168 | nbBits = (bitStream & 0xF) + FSEv07_MIN_TABLELOG; /* extract tableLog */ |
| 1169 | if (nbBits > FSEv07_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); |
| 1170 | bitStream >>= 4; |
| 1171 | bitCount = 4; |
| 1172 | *tableLogPtr = nbBits; |
| 1173 | remaining = (1<<nbBits)+1; |
| 1174 | threshold = 1<<nbBits; |
| 1175 | nbBits++; |
| 1176 | |
| 1177 | while ((remaining>1) && (charnum<=*maxSVPtr)) { |
| 1178 | if (previous0) { |
| 1179 | unsigned n0 = charnum; |
| 1180 | while ((bitStream & 0xFFFF) == 0xFFFF) { |
| 1181 | n0+=24; |
| 1182 | if (ip < iend-5) { |
| 1183 | ip+=2; |
| 1184 | bitStream = MEM_readLE32(ip) >> bitCount; |
| 1185 | } else { |
| 1186 | bitStream >>= 16; |
| 1187 | bitCount+=16; |
| 1188 | } } |
| 1189 | while ((bitStream & 3) == 3) { |
| 1190 | n0+=3; |
| 1191 | bitStream>>=2; |
| 1192 | bitCount+=2; |
| 1193 | } |
| 1194 | n0 += bitStream & 3; |
| 1195 | bitCount += 2; |
| 1196 | if (n0 > *maxSVPtr) return ERROR(maxSymbolValue_tooSmall); |
| 1197 | while (charnum < n0) normalizedCounter[charnum++] = 0; |
| 1198 | if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { |
| 1199 | ip += bitCount>>3; |
| 1200 | bitCount &= 7; |
| 1201 | bitStream = MEM_readLE32(ip) >> bitCount; |
| 1202 | } |
| 1203 | else |
| 1204 | bitStream >>= 2; |
| 1205 | } |
| 1206 | { short const max = (short)((2*threshold-1)-remaining); |
| 1207 | short count; |
| 1208 | |
| 1209 | if ((bitStream & (threshold-1)) < (U32)max) { |
| 1210 | count = (short)(bitStream & (threshold-1)); |
| 1211 | bitCount += nbBits-1; |
| 1212 | } else { |
| 1213 | count = (short)(bitStream & (2*threshold-1)); |
| 1214 | if (count >= threshold) count -= max; |
| 1215 | bitCount += nbBits; |
| 1216 | } |
| 1217 | |
| 1218 | count--; /* extra accuracy */ |
| 1219 | remaining -= FSEv07_abs(count); |
| 1220 | normalizedCounter[charnum++] = count; |
| 1221 | previous0 = !count; |
| 1222 | while (remaining < threshold) { |
| 1223 | nbBits--; |
| 1224 | threshold >>= 1; |
| 1225 | } |
| 1226 | |
| 1227 | if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { |
| 1228 | ip += bitCount>>3; |
| 1229 | bitCount &= 7; |
| 1230 | } else { |
| 1231 | bitCount -= (int)(8 * (iend - 4 - ip)); |
| 1232 | ip = iend - 4; |
| 1233 | } |
| 1234 | bitStream = MEM_readLE32(ip) >> (bitCount & 31); |
| 1235 | } } /* while ((remaining>1) && (charnum<=*maxSVPtr)) */ |
| 1236 | if (remaining != 1) return ERROR(GENERIC); |
| 1237 | *maxSVPtr = charnum-1; |
| 1238 | |
| 1239 | ip += (bitCount+7)>>3; |
| 1240 | if ((size_t)(ip-istart) > hbSize) return ERROR(srcSize_wrong); |
| 1241 | return ip-istart; |
| 1242 | } |
| 1243 | |
| 1244 | |
| 1245 | /*! HUFv07_readStats() : |
| 1246 | Read compact Huffman tree, saved by HUFv07_writeCTable(). |
| 1247 | `huffWeight` is destination buffer. |
| 1248 | @return : size read from `src` , or an error Code . |
| 1249 | Note : Needed by HUFv07_readCTable() and HUFv07_readDTableXn() . |
| 1250 | */ |
| 1251 | size_t HUFv07_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, |
| 1252 | U32* nbSymbolsPtr, U32* tableLogPtr, |
| 1253 | const void* src, size_t srcSize) |
| 1254 | { |
| 1255 | U32 weightTotal; |
| 1256 | const BYTE* ip = (const BYTE*) src; |
| 1257 | size_t iSize; |
| 1258 | size_t oSize; |
| 1259 | |
| 1260 | if (!srcSize) return ERROR(srcSize_wrong); |
| 1261 | iSize = ip[0]; |
| 1262 | /* memset(huffWeight, 0, hwSize); */ /* is not necessary, even though some analyzer complain ... */ |
| 1263 | |
| 1264 | if (iSize >= 128) { /* special header */ |
| 1265 | if (iSize >= (242)) { /* RLE */ |
| 1266 | static U32 l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; |
| 1267 | oSize = l[iSize-242]; |
| 1268 | memset(huffWeight, 1, hwSize); |
| 1269 | iSize = 0; |
| 1270 | } |
| 1271 | else { /* Incompressible */ |
| 1272 | oSize = iSize - 127; |
| 1273 | iSize = ((oSize+1)/2); |
| 1274 | if (iSize+1 > srcSize) return ERROR(srcSize_wrong); |
| 1275 | if (oSize >= hwSize) return ERROR(corruption_detected); |
| 1276 | ip += 1; |
| 1277 | { U32 n; |
| 1278 | for (n=0; n<oSize; n+=2) { |
| 1279 | huffWeight[n] = ip[n/2] >> 4; |
| 1280 | huffWeight[n+1] = ip[n/2] & 15; |
| 1281 | } } } } |
| 1282 | else { /* header compressed with FSE (normal case) */ |
| 1283 | if (iSize+1 > srcSize) return ERROR(srcSize_wrong); |
| 1284 | oSize = FSEv07_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */ |
| 1285 | if (FSEv07_isError(oSize)) return oSize; |
| 1286 | } |
| 1287 | |
| 1288 | /* collect weight stats */ |
| 1289 | memset(rankStats, 0, (HUFv07_TABLELOG_ABSOLUTEMAX + 1) * sizeof(U32)); |
| 1290 | weightTotal = 0; |
| 1291 | { U32 n; for (n=0; n<oSize; n++) { |
| 1292 | if (huffWeight[n] >= HUFv07_TABLELOG_ABSOLUTEMAX) return ERROR(corruption_detected); |
| 1293 | rankStats[huffWeight[n]]++; |
| 1294 | weightTotal += (1 << huffWeight[n]) >> 1; |
| 1295 | } } |
| 1296 | if (weightTotal == 0) return ERROR(corruption_detected); |
| 1297 | |
| 1298 | /* get last non-null symbol weight (implied, total must be 2^n) */ |
| 1299 | { U32 const tableLog = BITv07_highbit32(weightTotal) + 1; |
| 1300 | if (tableLog > HUFv07_TABLELOG_ABSOLUTEMAX) return ERROR(corruption_detected); |
| 1301 | *tableLogPtr = tableLog; |
| 1302 | /* determine last weight */ |
| 1303 | { U32 const total = 1 << tableLog; |
| 1304 | U32 const rest = total - weightTotal; |
| 1305 | U32 const verif = 1 << BITv07_highbit32(rest); |
| 1306 | U32 const lastWeight = BITv07_highbit32(rest) + 1; |
| 1307 | if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ |
| 1308 | huffWeight[oSize] = (BYTE)lastWeight; |
| 1309 | rankStats[lastWeight]++; |
| 1310 | } } |
| 1311 | |
| 1312 | /* check tree construction validity */ |
| 1313 | if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ |
| 1314 | |
| 1315 | /* results */ |
| 1316 | *nbSymbolsPtr = (U32)(oSize+1); |
| 1317 | return iSize+1; |
| 1318 | } |
| 1319 | /* ****************************************************************** |
| 1320 | FSE : Finite State Entropy decoder |
| 1321 | Copyright (C) 2013-2015, Yann Collet. |
| 1322 | |
| 1323 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 1324 | |
| 1325 | Redistribution and use in source and binary forms, with or without |
| 1326 | modification, are permitted provided that the following conditions are |
| 1327 | met: |
| 1328 | |
| 1329 | * Redistributions of source code must retain the above copyright |
| 1330 | notice, this list of conditions and the following disclaimer. |
| 1331 | * Redistributions in binary form must reproduce the above |
| 1332 | copyright notice, this list of conditions and the following disclaimer |
| 1333 | in the documentation and/or other materials provided with the |
| 1334 | distribution. |
| 1335 | |
| 1336 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 1337 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 1338 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 1339 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 1340 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 1341 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 1342 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 1343 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 1344 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 1345 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 1346 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 1347 | |
| 1348 | You can contact the author at : |
| 1349 | - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 1350 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 1351 | ****************************************************************** */ |
| 1352 | |
| 1353 | |
| 1354 | /* ************************************************************** |
| 1355 | * Compiler specifics |
| 1356 | ****************************************************************/ |
| 1357 | #ifdef _MSC_VER /* Visual Studio */ |
| 1358 | # define FORCE_INLINE static __forceinline |
| 1359 | # include <intrin.h> /* For Visual 2005 */ |
| 1360 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 1361 | # pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ |
| 1362 | #else |
| 1363 | # if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ |
| 1364 | # ifdef __GNUC__ |
| 1365 | # define FORCE_INLINE static inline __attribute__((always_inline)) |
| 1366 | # else |
| 1367 | # define FORCE_INLINE static inline |
| 1368 | # endif |
| 1369 | # else |
| 1370 | # define FORCE_INLINE static |
| 1371 | # endif /* __STDC_VERSION__ */ |
| 1372 | #endif |
| 1373 | |
| 1374 | |
| 1375 | /* ************************************************************** |
| 1376 | * Error Management |
| 1377 | ****************************************************************/ |
| 1378 | #define FSEv07_isError ERR_isError |
| 1379 | #define FSEv07_STATIC_ASSERT(c) { enum { FSEv07_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ |
| 1380 | |
| 1381 | |
| 1382 | /* ************************************************************** |
| 1383 | * Complex types |
| 1384 | ****************************************************************/ |
| 1385 | typedef U32 DTable_max_t[FSEv07_DTABLE_SIZE_U32(FSEv07_MAX_TABLELOG)]; |
| 1386 | |
| 1387 | |
| 1388 | /* ************************************************************** |
| 1389 | * Templates |
| 1390 | ****************************************************************/ |
| 1391 | /* |
| 1392 | designed to be included |
| 1393 | for type-specific functions (template emulation in C) |
| 1394 | Objective is to write these functions only once, for improved maintenance |
| 1395 | */ |
| 1396 | |
| 1397 | /* safety checks */ |
| 1398 | #ifndef FSEv07_FUNCTION_EXTENSION |
| 1399 | # error "FSEv07_FUNCTION_EXTENSION must be defined" |
| 1400 | #endif |
| 1401 | #ifndef FSEv07_FUNCTION_TYPE |
| 1402 | # error "FSEv07_FUNCTION_TYPE must be defined" |
| 1403 | #endif |
| 1404 | |
| 1405 | /* Function names */ |
| 1406 | #define FSEv07_CAT(X,Y) X##Y |
| 1407 | #define FSEv07_FUNCTION_NAME(X,Y) FSEv07_CAT(X,Y) |
| 1408 | #define FSEv07_TYPE_NAME(X,Y) FSEv07_CAT(X,Y) |
| 1409 | |
| 1410 | |
| 1411 | /* Function templates */ |
| 1412 | FSEv07_DTable* FSEv07_createDTable (unsigned tableLog) |
| 1413 | { |
| 1414 | if (tableLog > FSEv07_TABLELOG_ABSOLUTE_MAX) tableLog = FSEv07_TABLELOG_ABSOLUTE_MAX; |
| 1415 | return (FSEv07_DTable*)malloc( FSEv07_DTABLE_SIZE_U32(tableLog) * sizeof (U32) ); |
| 1416 | } |
| 1417 | |
| 1418 | void FSEv07_freeDTable (FSEv07_DTable* dt) |
| 1419 | { |
| 1420 | free(dt); |
| 1421 | } |
| 1422 | |
| 1423 | size_t FSEv07_buildDTable(FSEv07_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) |
| 1424 | { |
| 1425 | void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */ |
| 1426 | FSEv07_DECODE_TYPE* const tableDecode = (FSEv07_DECODE_TYPE*) (tdPtr); |
| 1427 | U16 symbolNext[FSEv07_MAX_SYMBOL_VALUE+1]; |
| 1428 | |
| 1429 | U32 const maxSV1 = maxSymbolValue + 1; |
| 1430 | U32 const tableSize = 1 << tableLog; |
| 1431 | U32 highThreshold = tableSize-1; |
| 1432 | |
| 1433 | /* Sanity Checks */ |
| 1434 | if (maxSymbolValue > FSEv07_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); |
| 1435 | if (tableLog > FSEv07_MAX_TABLELOG) return ERROR(tableLog_tooLarge); |
| 1436 | |
| 1437 | /* Init, lay down lowprob symbols */ |
| 1438 | { FSEv07_DTableHeader DTableH; |
| 1439 | DTableH.tableLog = (U16)tableLog; |
| 1440 | DTableH.fastMode = 1; |
| 1441 | { S16 const largeLimit= (S16)(1 << (tableLog-1)); |
| 1442 | U32 s; |
| 1443 | for (s=0; s<maxSV1; s++) { |
| 1444 | if (normalizedCounter[s]==-1) { |
| 1445 | tableDecode[highThreshold--].symbol = (FSEv07_FUNCTION_TYPE)s; |
| 1446 | symbolNext[s] = 1; |
| 1447 | } else { |
| 1448 | if (normalizedCounter[s] >= largeLimit) DTableH.fastMode=0; |
| 1449 | symbolNext[s] = normalizedCounter[s]; |
| 1450 | } } } |
| 1451 | memcpy(dt, &DTableH, sizeof(DTableH)); |
| 1452 | } |
| 1453 | |
| 1454 | /* Spread symbols */ |
| 1455 | { U32 const tableMask = tableSize-1; |
| 1456 | U32 const step = FSEv07_TABLESTEP(tableSize); |
| 1457 | U32 s, position = 0; |
| 1458 | for (s=0; s<maxSV1; s++) { |
| 1459 | int i; |
| 1460 | for (i=0; i<normalizedCounter[s]; i++) { |
| 1461 | tableDecode[position].symbol = (FSEv07_FUNCTION_TYPE)s; |
| 1462 | position = (position + step) & tableMask; |
| 1463 | while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */ |
| 1464 | } } |
| 1465 | |
| 1466 | if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ |
| 1467 | } |
| 1468 | |
| 1469 | /* Build Decoding table */ |
| 1470 | { U32 u; |
| 1471 | for (u=0; u<tableSize; u++) { |
| 1472 | FSEv07_FUNCTION_TYPE const symbol = (FSEv07_FUNCTION_TYPE)(tableDecode[u].symbol); |
| 1473 | U16 nextState = symbolNext[symbol]++; |
| 1474 | tableDecode[u].nbBits = (BYTE) (tableLog - BITv07_highbit32 ((U32)nextState) ); |
| 1475 | tableDecode[u].newState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize); |
| 1476 | } } |
| 1477 | |
| 1478 | return 0; |
| 1479 | } |
| 1480 | |
| 1481 | |
| 1482 | |
| 1483 | #ifndef FSEv07_COMMONDEFS_ONLY |
| 1484 | |
| 1485 | /*-******************************************************* |
| 1486 | * Decompression (Byte symbols) |
| 1487 | *********************************************************/ |
| 1488 | size_t FSEv07_buildDTable_rle (FSEv07_DTable* dt, BYTE symbolValue) |
| 1489 | { |
| 1490 | void* ptr = dt; |
| 1491 | FSEv07_DTableHeader* const DTableH = (FSEv07_DTableHeader*)ptr; |
| 1492 | void* dPtr = dt + 1; |
| 1493 | FSEv07_decode_t* const cell = (FSEv07_decode_t*)dPtr; |
| 1494 | |
| 1495 | DTableH->tableLog = 0; |
| 1496 | DTableH->fastMode = 0; |
| 1497 | |
| 1498 | cell->newState = 0; |
| 1499 | cell->symbol = symbolValue; |
| 1500 | cell->nbBits = 0; |
| 1501 | |
| 1502 | return 0; |
| 1503 | } |
| 1504 | |
| 1505 | |
| 1506 | size_t FSEv07_buildDTable_raw (FSEv07_DTable* dt, unsigned nbBits) |
| 1507 | { |
| 1508 | void* ptr = dt; |
| 1509 | FSEv07_DTableHeader* const DTableH = (FSEv07_DTableHeader*)ptr; |
| 1510 | void* dPtr = dt + 1; |
| 1511 | FSEv07_decode_t* const dinfo = (FSEv07_decode_t*)dPtr; |
| 1512 | const unsigned tableSize = 1 << nbBits; |
| 1513 | const unsigned tableMask = tableSize - 1; |
| 1514 | const unsigned maxSV1 = tableMask+1; |
| 1515 | unsigned s; |
| 1516 | |
| 1517 | /* Sanity checks */ |
| 1518 | if (nbBits < 1) return ERROR(GENERIC); /* min size */ |
| 1519 | |
| 1520 | /* Build Decoding Table */ |
| 1521 | DTableH->tableLog = (U16)nbBits; |
| 1522 | DTableH->fastMode = 1; |
| 1523 | for (s=0; s<maxSV1; s++) { |
| 1524 | dinfo[s].newState = 0; |
| 1525 | dinfo[s].symbol = (BYTE)s; |
| 1526 | dinfo[s].nbBits = (BYTE)nbBits; |
| 1527 | } |
| 1528 | |
| 1529 | return 0; |
| 1530 | } |
| 1531 | |
| 1532 | FORCE_INLINE size_t FSEv07_decompress_usingDTable_generic( |
| 1533 | void* dst, size_t maxDstSize, |
| 1534 | const void* cSrc, size_t cSrcSize, |
| 1535 | const FSEv07_DTable* dt, const unsigned fast) |
| 1536 | { |
| 1537 | BYTE* const ostart = (BYTE*) dst; |
| 1538 | BYTE* op = ostart; |
| 1539 | BYTE* const omax = op + maxDstSize; |
| 1540 | BYTE* const olimit = omax-3; |
| 1541 | |
| 1542 | BITv07_DStream_t bitD; |
| 1543 | FSEv07_DState_t state1; |
| 1544 | FSEv07_DState_t state2; |
| 1545 | |
| 1546 | /* Init */ |
| 1547 | { size_t const errorCode = BITv07_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */ |
| 1548 | if (FSEv07_isError(errorCode)) return errorCode; } |
| 1549 | |
| 1550 | FSEv07_initDState(&state1, &bitD, dt); |
| 1551 | FSEv07_initDState(&state2, &bitD, dt); |
| 1552 | |
| 1553 | #define FSEv07_GETSYMBOL(statePtr) fast ? FSEv07_decodeSymbolFast(statePtr, &bitD) : FSEv07_decodeSymbol(statePtr, &bitD) |
| 1554 | |
| 1555 | /* 4 symbols per loop */ |
| 1556 | for ( ; (BITv07_reloadDStream(&bitD)==BITv07_DStream_unfinished) && (op<olimit) ; op+=4) { |
| 1557 | op[0] = FSEv07_GETSYMBOL(&state1); |
| 1558 | |
| 1559 | if (FSEv07_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1560 | BITv07_reloadDStream(&bitD); |
| 1561 | |
| 1562 | op[1] = FSEv07_GETSYMBOL(&state2); |
| 1563 | |
| 1564 | if (FSEv07_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1565 | { if (BITv07_reloadDStream(&bitD) > BITv07_DStream_unfinished) { op+=2; break; } } |
| 1566 | |
| 1567 | op[2] = FSEv07_GETSYMBOL(&state1); |
| 1568 | |
| 1569 | if (FSEv07_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1570 | BITv07_reloadDStream(&bitD); |
| 1571 | |
| 1572 | op[3] = FSEv07_GETSYMBOL(&state2); |
| 1573 | } |
| 1574 | |
| 1575 | /* tail */ |
| 1576 | /* note : BITv07_reloadDStream(&bitD) >= FSEv07_DStream_partiallyFilled; Ends at exactly BITv07_DStream_completed */ |
| 1577 | while (1) { |
| 1578 | if (op>(omax-2)) return ERROR(dstSize_tooSmall); |
| 1579 | |
| 1580 | *op++ = FSEv07_GETSYMBOL(&state1); |
| 1581 | |
| 1582 | if (BITv07_reloadDStream(&bitD)==BITv07_DStream_overflow) { |
| 1583 | *op++ = FSEv07_GETSYMBOL(&state2); |
| 1584 | break; |
| 1585 | } |
| 1586 | |
| 1587 | if (op>(omax-2)) return ERROR(dstSize_tooSmall); |
| 1588 | |
| 1589 | *op++ = FSEv07_GETSYMBOL(&state2); |
| 1590 | |
| 1591 | if (BITv07_reloadDStream(&bitD)==BITv07_DStream_overflow) { |
| 1592 | *op++ = FSEv07_GETSYMBOL(&state1); |
| 1593 | break; |
| 1594 | } } |
| 1595 | |
| 1596 | return op-ostart; |
| 1597 | } |
| 1598 | |
| 1599 | |
| 1600 | size_t FSEv07_decompress_usingDTable(void* dst, size_t originalSize, |
| 1601 | const void* cSrc, size_t cSrcSize, |
| 1602 | const FSEv07_DTable* dt) |
| 1603 | { |
| 1604 | const void* ptr = dt; |
| 1605 | const FSEv07_DTableHeader* DTableH = (const FSEv07_DTableHeader*)ptr; |
| 1606 | const U32 fastMode = DTableH->fastMode; |
| 1607 | |
| 1608 | /* select fast mode (static) */ |
| 1609 | if (fastMode) return FSEv07_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); |
| 1610 | return FSEv07_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); |
| 1611 | } |
| 1612 | |
| 1613 | |
| 1614 | size_t FSEv07_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) |
| 1615 | { |
| 1616 | const BYTE* const istart = (const BYTE*)cSrc; |
| 1617 | const BYTE* ip = istart; |
| 1618 | short counting[FSEv07_MAX_SYMBOL_VALUE+1]; |
| 1619 | DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ |
| 1620 | unsigned tableLog; |
| 1621 | unsigned maxSymbolValue = FSEv07_MAX_SYMBOL_VALUE; |
| 1622 | |
| 1623 | if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */ |
| 1624 | |
| 1625 | /* normal FSE decoding mode */ |
| 1626 | { size_t const NCountLength = FSEv07_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); |
| 1627 | if (FSEv07_isError(NCountLength)) return NCountLength; |
| 1628 | if (NCountLength >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */ |
| 1629 | ip += NCountLength; |
| 1630 | cSrcSize -= NCountLength; |
| 1631 | } |
| 1632 | |
| 1633 | { size_t const errorCode = FSEv07_buildDTable (dt, counting, maxSymbolValue, tableLog); |
| 1634 | if (FSEv07_isError(errorCode)) return errorCode; } |
| 1635 | |
| 1636 | return FSEv07_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); /* always return, even if it is an error code */ |
| 1637 | } |
| 1638 | |
| 1639 | |
| 1640 | |
| 1641 | #endif /* FSEv07_COMMONDEFS_ONLY */ |
| 1642 | |
| 1643 | /* ****************************************************************** |
| 1644 | Huffman decoder, part of New Generation Entropy library |
| 1645 | Copyright (C) 2013-2016, Yann Collet. |
| 1646 | |
| 1647 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 1648 | |
| 1649 | Redistribution and use in source and binary forms, with or without |
| 1650 | modification, are permitted provided that the following conditions are |
| 1651 | met: |
| 1652 | |
| 1653 | * Redistributions of source code must retain the above copyright |
| 1654 | notice, this list of conditions and the following disclaimer. |
| 1655 | * Redistributions in binary form must reproduce the above |
| 1656 | copyright notice, this list of conditions and the following disclaimer |
| 1657 | in the documentation and/or other materials provided with the |
| 1658 | distribution. |
| 1659 | |
| 1660 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 1661 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 1662 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 1663 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 1664 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 1665 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 1666 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 1667 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 1668 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 1669 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 1670 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 1671 | |
| 1672 | You can contact the author at : |
| 1673 | - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 1674 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 1675 | ****************************************************************** */ |
| 1676 | |
| 1677 | /* ************************************************************** |
| 1678 | * Compiler specifics |
| 1679 | ****************************************************************/ |
| 1680 | #if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
| 1681 | /* inline is defined */ |
| 1682 | #elif defined(_MSC_VER) |
| 1683 | # define inline __inline |
| 1684 | #else |
| 1685 | # define inline /* disable inline */ |
| 1686 | #endif |
| 1687 | |
| 1688 | |
| 1689 | #ifdef _MSC_VER /* Visual Studio */ |
| 1690 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 1691 | #endif |
| 1692 | |
| 1693 | |
| 1694 | |
| 1695 | /* ************************************************************** |
| 1696 | * Error Management |
| 1697 | ****************************************************************/ |
| 1698 | #define HUFv07_STATIC_ASSERT(c) { enum { HUFv07_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ |
| 1699 | |
| 1700 | |
| 1701 | /*-***************************/ |
| 1702 | /* generic DTableDesc */ |
| 1703 | /*-***************************/ |
| 1704 | |
| 1705 | typedef struct { BYTE maxTableLog; BYTE tableType; BYTE tableLog; BYTE reserved; } DTableDesc; |
| 1706 | |
| 1707 | static DTableDesc HUFv07_getDTableDesc(const HUFv07_DTable* table) |
| 1708 | { |
| 1709 | DTableDesc dtd; |
| 1710 | memcpy(&dtd, table, sizeof(dtd)); |
| 1711 | return dtd; |
| 1712 | } |
| 1713 | |
| 1714 | |
| 1715 | /*-***************************/ |
| 1716 | /* single-symbol decoding */ |
| 1717 | /*-***************************/ |
| 1718 | |
| 1719 | typedef struct { BYTE byte; BYTE nbBits; } HUFv07_DEltX2; /* single-symbol decoding */ |
| 1720 | |
| 1721 | size_t HUFv07_readDTableX2 (HUFv07_DTable* DTable, const void* src, size_t srcSize) |
| 1722 | { |
| 1723 | BYTE huffWeight[HUFv07_SYMBOLVALUE_MAX + 1]; |
| 1724 | U32 rankVal[HUFv07_TABLELOG_ABSOLUTEMAX + 1]; /* large enough for values from 0 to 16 */ |
| 1725 | U32 tableLog = 0; |
| 1726 | U32 nbSymbols = 0; |
| 1727 | size_t iSize; |
| 1728 | void* const dtPtr = DTable + 1; |
| 1729 | HUFv07_DEltX2* const dt = (HUFv07_DEltX2*)dtPtr; |
| 1730 | |
| 1731 | HUFv07_STATIC_ASSERT(sizeof(DTableDesc) == sizeof(HUFv07_DTable)); |
| 1732 | /* memset(huffWeight, 0, sizeof(huffWeight)); */ /* is not necessary, even though some analyzer complain ... */ |
| 1733 | |
| 1734 | iSize = HUFv07_readStats(huffWeight, HUFv07_SYMBOLVALUE_MAX + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); |
| 1735 | if (HUFv07_isError(iSize)) return iSize; |
| 1736 | |
| 1737 | /* Table header */ |
| 1738 | { DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 1739 | if (tableLog > (U32)(dtd.maxTableLog+1)) return ERROR(tableLog_tooLarge); /* DTable too small, huffman tree cannot fit in */ |
| 1740 | dtd.tableType = 0; |
| 1741 | dtd.tableLog = (BYTE)tableLog; |
| 1742 | memcpy(DTable, &dtd, sizeof(dtd)); |
| 1743 | } |
| 1744 | |
| 1745 | /* Prepare ranks */ |
| 1746 | { U32 n, nextRankStart = 0; |
| 1747 | for (n=1; n<tableLog+1; n++) { |
| 1748 | U32 current = nextRankStart; |
| 1749 | nextRankStart += (rankVal[n] << (n-1)); |
| 1750 | rankVal[n] = current; |
| 1751 | } } |
| 1752 | |
| 1753 | /* fill DTable */ |
| 1754 | { U32 n; |
| 1755 | for (n=0; n<nbSymbols; n++) { |
| 1756 | U32 const w = huffWeight[n]; |
| 1757 | U32 const length = (1 << w) >> 1; |
| 1758 | U32 i; |
| 1759 | HUFv07_DEltX2 D; |
| 1760 | D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); |
| 1761 | for (i = rankVal[w]; i < rankVal[w] + length; i++) |
| 1762 | dt[i] = D; |
| 1763 | rankVal[w] += length; |
| 1764 | } } |
| 1765 | |
| 1766 | return iSize; |
| 1767 | } |
| 1768 | |
| 1769 | |
| 1770 | static BYTE HUFv07_decodeSymbolX2(BITv07_DStream_t* Dstream, const HUFv07_DEltX2* dt, const U32 dtLog) |
| 1771 | { |
| 1772 | size_t const val = BITv07_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ |
| 1773 | BYTE const c = dt[val].byte; |
| 1774 | BITv07_skipBits(Dstream, dt[val].nbBits); |
| 1775 | return c; |
| 1776 | } |
| 1777 | |
| 1778 | #define HUFv07_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ |
| 1779 | *ptr++ = HUFv07_decodeSymbolX2(DStreamPtr, dt, dtLog) |
| 1780 | |
| 1781 | #define HUFv07_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ |
| 1782 | if (MEM_64bits() || (HUFv07_TABLELOG_MAX<=12)) \ |
| 1783 | HUFv07_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
| 1784 | |
| 1785 | #define HUFv07_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ |
| 1786 | if (MEM_64bits()) \ |
| 1787 | HUFv07_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
| 1788 | |
| 1789 | static inline size_t HUFv07_decodeStreamX2(BYTE* p, BITv07_DStream_t* const bitDPtr, BYTE* const pEnd, const HUFv07_DEltX2* const dt, const U32 dtLog) |
| 1790 | { |
| 1791 | BYTE* const pStart = p; |
| 1792 | |
| 1793 | /* up to 4 symbols at a time */ |
| 1794 | while ((BITv07_reloadDStream(bitDPtr) == BITv07_DStream_unfinished) && (p <= pEnd-4)) { |
| 1795 | HUFv07_DECODE_SYMBOLX2_2(p, bitDPtr); |
| 1796 | HUFv07_DECODE_SYMBOLX2_1(p, bitDPtr); |
| 1797 | HUFv07_DECODE_SYMBOLX2_2(p, bitDPtr); |
| 1798 | HUFv07_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1799 | } |
| 1800 | |
| 1801 | /* closer to the end */ |
| 1802 | while ((BITv07_reloadDStream(bitDPtr) == BITv07_DStream_unfinished) && (p < pEnd)) |
| 1803 | HUFv07_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1804 | |
| 1805 | /* no more data to retrieve from bitstream, hence no need to reload */ |
| 1806 | while (p < pEnd) |
| 1807 | HUFv07_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1808 | |
| 1809 | return pEnd-pStart; |
| 1810 | } |
| 1811 | |
| 1812 | static size_t HUFv07_decompress1X2_usingDTable_internal( |
| 1813 | void* dst, size_t dstSize, |
| 1814 | const void* cSrc, size_t cSrcSize, |
| 1815 | const HUFv07_DTable* DTable) |
| 1816 | { |
| 1817 | BYTE* op = (BYTE*)dst; |
| 1818 | BYTE* const oend = op + dstSize; |
| 1819 | const void* dtPtr = DTable + 1; |
| 1820 | const HUFv07_DEltX2* const dt = (const HUFv07_DEltX2*)dtPtr; |
| 1821 | BITv07_DStream_t bitD; |
| 1822 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 1823 | U32 const dtLog = dtd.tableLog; |
| 1824 | |
| 1825 | { size_t const errorCode = BITv07_initDStream(&bitD, cSrc, cSrcSize); |
| 1826 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 1827 | |
| 1828 | HUFv07_decodeStreamX2(op, &bitD, oend, dt, dtLog); |
| 1829 | |
| 1830 | /* check */ |
| 1831 | if (!BITv07_endOfDStream(&bitD)) return ERROR(corruption_detected); |
| 1832 | |
| 1833 | return dstSize; |
| 1834 | } |
| 1835 | |
| 1836 | size_t HUFv07_decompress1X2_usingDTable( |
| 1837 | void* dst, size_t dstSize, |
| 1838 | const void* cSrc, size_t cSrcSize, |
| 1839 | const HUFv07_DTable* DTable) |
| 1840 | { |
| 1841 | DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 1842 | if (dtd.tableType != 0) return ERROR(GENERIC); |
| 1843 | return HUFv07_decompress1X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
| 1844 | } |
| 1845 | |
| 1846 | size_t HUFv07_decompress1X2_DCtx (HUFv07_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 1847 | { |
| 1848 | const BYTE* ip = (const BYTE*) cSrc; |
| 1849 | |
| 1850 | size_t const hSize = HUFv07_readDTableX2 (DCtx, cSrc, cSrcSize); |
| 1851 | if (HUFv07_isError(hSize)) return hSize; |
| 1852 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
| 1853 | ip += hSize; cSrcSize -= hSize; |
| 1854 | |
| 1855 | return HUFv07_decompress1X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); |
| 1856 | } |
| 1857 | |
| 1858 | size_t HUFv07_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 1859 | { |
| 1860 | HUFv07_CREATE_STATIC_DTABLEX2(DTable, HUFv07_TABLELOG_MAX); |
| 1861 | return HUFv07_decompress1X2_DCtx (DTable, dst, dstSize, cSrc, cSrcSize); |
| 1862 | } |
| 1863 | |
| 1864 | |
| 1865 | static size_t HUFv07_decompress4X2_usingDTable_internal( |
| 1866 | void* dst, size_t dstSize, |
| 1867 | const void* cSrc, size_t cSrcSize, |
| 1868 | const HUFv07_DTable* DTable) |
| 1869 | { |
| 1870 | /* Check */ |
| 1871 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
| 1872 | |
| 1873 | { const BYTE* const istart = (const BYTE*) cSrc; |
| 1874 | BYTE* const ostart = (BYTE*) dst; |
| 1875 | BYTE* const oend = ostart + dstSize; |
| 1876 | const void* const dtPtr = DTable + 1; |
| 1877 | const HUFv07_DEltX2* const dt = (const HUFv07_DEltX2*)dtPtr; |
| 1878 | |
| 1879 | /* Init */ |
| 1880 | BITv07_DStream_t bitD1; |
| 1881 | BITv07_DStream_t bitD2; |
| 1882 | BITv07_DStream_t bitD3; |
| 1883 | BITv07_DStream_t bitD4; |
| 1884 | size_t const length1 = MEM_readLE16(istart); |
| 1885 | size_t const length2 = MEM_readLE16(istart+2); |
| 1886 | size_t const length3 = MEM_readLE16(istart+4); |
| 1887 | size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); |
| 1888 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
| 1889 | const BYTE* const istart2 = istart1 + length1; |
| 1890 | const BYTE* const istart3 = istart2 + length2; |
| 1891 | const BYTE* const istart4 = istart3 + length3; |
| 1892 | const size_t segmentSize = (dstSize+3) / 4; |
| 1893 | BYTE* const opStart2 = ostart + segmentSize; |
| 1894 | BYTE* const opStart3 = opStart2 + segmentSize; |
| 1895 | BYTE* const opStart4 = opStart3 + segmentSize; |
| 1896 | BYTE* op1 = ostart; |
| 1897 | BYTE* op2 = opStart2; |
| 1898 | BYTE* op3 = opStart3; |
| 1899 | BYTE* op4 = opStart4; |
| 1900 | U32 endSignal; |
| 1901 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 1902 | U32 const dtLog = dtd.tableLog; |
| 1903 | |
| 1904 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
| 1905 | { size_t const errorCode = BITv07_initDStream(&bitD1, istart1, length1); |
| 1906 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 1907 | { size_t const errorCode = BITv07_initDStream(&bitD2, istart2, length2); |
| 1908 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 1909 | { size_t const errorCode = BITv07_initDStream(&bitD3, istart3, length3); |
| 1910 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 1911 | { size_t const errorCode = BITv07_initDStream(&bitD4, istart4, length4); |
| 1912 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 1913 | |
| 1914 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
| 1915 | endSignal = BITv07_reloadDStream(&bitD1) | BITv07_reloadDStream(&bitD2) | BITv07_reloadDStream(&bitD3) | BITv07_reloadDStream(&bitD4); |
| 1916 | for ( ; (endSignal==BITv07_DStream_unfinished) && (op4<(oend-7)) ; ) { |
| 1917 | HUFv07_DECODE_SYMBOLX2_2(op1, &bitD1); |
| 1918 | HUFv07_DECODE_SYMBOLX2_2(op2, &bitD2); |
| 1919 | HUFv07_DECODE_SYMBOLX2_2(op3, &bitD3); |
| 1920 | HUFv07_DECODE_SYMBOLX2_2(op4, &bitD4); |
| 1921 | HUFv07_DECODE_SYMBOLX2_1(op1, &bitD1); |
| 1922 | HUFv07_DECODE_SYMBOLX2_1(op2, &bitD2); |
| 1923 | HUFv07_DECODE_SYMBOLX2_1(op3, &bitD3); |
| 1924 | HUFv07_DECODE_SYMBOLX2_1(op4, &bitD4); |
| 1925 | HUFv07_DECODE_SYMBOLX2_2(op1, &bitD1); |
| 1926 | HUFv07_DECODE_SYMBOLX2_2(op2, &bitD2); |
| 1927 | HUFv07_DECODE_SYMBOLX2_2(op3, &bitD3); |
| 1928 | HUFv07_DECODE_SYMBOLX2_2(op4, &bitD4); |
| 1929 | HUFv07_DECODE_SYMBOLX2_0(op1, &bitD1); |
| 1930 | HUFv07_DECODE_SYMBOLX2_0(op2, &bitD2); |
| 1931 | HUFv07_DECODE_SYMBOLX2_0(op3, &bitD3); |
| 1932 | HUFv07_DECODE_SYMBOLX2_0(op4, &bitD4); |
| 1933 | endSignal = BITv07_reloadDStream(&bitD1) | BITv07_reloadDStream(&bitD2) | BITv07_reloadDStream(&bitD3) | BITv07_reloadDStream(&bitD4); |
| 1934 | } |
| 1935 | |
| 1936 | /* check corruption */ |
| 1937 | if (op1 > opStart2) return ERROR(corruption_detected); |
| 1938 | if (op2 > opStart3) return ERROR(corruption_detected); |
| 1939 | if (op3 > opStart4) return ERROR(corruption_detected); |
| 1940 | /* note : op4 supposed already verified within main loop */ |
| 1941 | |
| 1942 | /* finish bitStreams one by one */ |
| 1943 | HUFv07_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); |
| 1944 | HUFv07_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); |
| 1945 | HUFv07_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); |
| 1946 | HUFv07_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); |
| 1947 | |
| 1948 | /* check */ |
| 1949 | endSignal = BITv07_endOfDStream(&bitD1) & BITv07_endOfDStream(&bitD2) & BITv07_endOfDStream(&bitD3) & BITv07_endOfDStream(&bitD4); |
| 1950 | if (!endSignal) return ERROR(corruption_detected); |
| 1951 | |
| 1952 | /* decoded size */ |
| 1953 | return dstSize; |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | |
| 1958 | size_t HUFv07_decompress4X2_usingDTable( |
| 1959 | void* dst, size_t dstSize, |
| 1960 | const void* cSrc, size_t cSrcSize, |
| 1961 | const HUFv07_DTable* DTable) |
| 1962 | { |
| 1963 | DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 1964 | if (dtd.tableType != 0) return ERROR(GENERIC); |
| 1965 | return HUFv07_decompress4X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
| 1966 | } |
| 1967 | |
| 1968 | |
| 1969 | size_t HUFv07_decompress4X2_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 1970 | { |
| 1971 | const BYTE* ip = (const BYTE*) cSrc; |
| 1972 | |
| 1973 | size_t const hSize = HUFv07_readDTableX2 (dctx, cSrc, cSrcSize); |
| 1974 | if (HUFv07_isError(hSize)) return hSize; |
| 1975 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
| 1976 | ip += hSize; cSrcSize -= hSize; |
| 1977 | |
| 1978 | return HUFv07_decompress4X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, dctx); |
| 1979 | } |
| 1980 | |
| 1981 | size_t HUFv07_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 1982 | { |
| 1983 | HUFv07_CREATE_STATIC_DTABLEX2(DTable, HUFv07_TABLELOG_MAX); |
| 1984 | return HUFv07_decompress4X2_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
| 1985 | } |
| 1986 | |
| 1987 | |
| 1988 | /* *************************/ |
| 1989 | /* double-symbols decoding */ |
| 1990 | /* *************************/ |
| 1991 | typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUFv07_DEltX4; /* double-symbols decoding */ |
| 1992 | |
| 1993 | typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; |
| 1994 | |
| 1995 | static void HUFv07_fillDTableX4Level2(HUFv07_DEltX4* DTable, U32 sizeLog, const U32 consumed, |
| 1996 | const U32* rankValOrigin, const int minWeight, |
| 1997 | const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, |
| 1998 | U32 nbBitsBaseline, U16 baseSeq) |
| 1999 | { |
| 2000 | HUFv07_DEltX4 DElt; |
| 2001 | U32 rankVal[HUFv07_TABLELOG_ABSOLUTEMAX + 1]; |
| 2002 | |
| 2003 | /* get pre-calculated rankVal */ |
| 2004 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
| 2005 | |
| 2006 | /* fill skipped values */ |
| 2007 | if (minWeight>1) { |
| 2008 | U32 i, skipSize = rankVal[minWeight]; |
| 2009 | MEM_writeLE16(&(DElt.sequence), baseSeq); |
| 2010 | DElt.nbBits = (BYTE)(consumed); |
| 2011 | DElt.length = 1; |
| 2012 | for (i = 0; i < skipSize; i++) |
| 2013 | DTable[i] = DElt; |
| 2014 | } |
| 2015 | |
| 2016 | /* fill DTable */ |
| 2017 | { U32 s; for (s=0; s<sortedListSize; s++) { /* note : sortedSymbols already skipped */ |
| 2018 | const U32 symbol = sortedSymbols[s].symbol; |
| 2019 | const U32 weight = sortedSymbols[s].weight; |
| 2020 | const U32 nbBits = nbBitsBaseline - weight; |
| 2021 | const U32 length = 1 << (sizeLog-nbBits); |
| 2022 | const U32 start = rankVal[weight]; |
| 2023 | U32 i = start; |
| 2024 | const U32 end = start + length; |
| 2025 | |
| 2026 | MEM_writeLE16(&(DElt.sequence), (U16)(baseSeq + (symbol << 8))); |
| 2027 | DElt.nbBits = (BYTE)(nbBits + consumed); |
| 2028 | DElt.length = 2; |
| 2029 | do { DTable[i++] = DElt; } while (i<end); /* since length >= 1 */ |
| 2030 | |
| 2031 | rankVal[weight] += length; |
| 2032 | }} |
| 2033 | } |
| 2034 | |
| 2035 | typedef U32 rankVal_t[HUFv07_TABLELOG_ABSOLUTEMAX][HUFv07_TABLELOG_ABSOLUTEMAX + 1]; |
| 2036 | |
| 2037 | static void HUFv07_fillDTableX4(HUFv07_DEltX4* DTable, const U32 targetLog, |
| 2038 | const sortedSymbol_t* sortedList, const U32 sortedListSize, |
| 2039 | const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, |
| 2040 | const U32 nbBitsBaseline) |
| 2041 | { |
| 2042 | U32 rankVal[HUFv07_TABLELOG_ABSOLUTEMAX + 1]; |
| 2043 | const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ |
| 2044 | const U32 minBits = nbBitsBaseline - maxWeight; |
| 2045 | U32 s; |
| 2046 | |
| 2047 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
| 2048 | |
| 2049 | /* fill DTable */ |
| 2050 | for (s=0; s<sortedListSize; s++) { |
| 2051 | const U16 symbol = sortedList[s].symbol; |
| 2052 | const U32 weight = sortedList[s].weight; |
| 2053 | const U32 nbBits = nbBitsBaseline - weight; |
| 2054 | const U32 start = rankVal[weight]; |
| 2055 | const U32 length = 1 << (targetLog-nbBits); |
| 2056 | |
| 2057 | if (targetLog-nbBits >= minBits) { /* enough room for a second symbol */ |
| 2058 | U32 sortedRank; |
| 2059 | int minWeight = nbBits + scaleLog; |
| 2060 | if (minWeight < 1) minWeight = 1; |
| 2061 | sortedRank = rankStart[minWeight]; |
| 2062 | HUFv07_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, |
| 2063 | rankValOrigin[nbBits], minWeight, |
| 2064 | sortedList+sortedRank, sortedListSize-sortedRank, |
| 2065 | nbBitsBaseline, symbol); |
| 2066 | } else { |
| 2067 | HUFv07_DEltX4 DElt; |
| 2068 | MEM_writeLE16(&(DElt.sequence), symbol); |
| 2069 | DElt.nbBits = (BYTE)(nbBits); |
| 2070 | DElt.length = 1; |
| 2071 | { U32 u; |
| 2072 | const U32 end = start + length; |
| 2073 | for (u = start; u < end; u++) DTable[u] = DElt; |
| 2074 | } } |
| 2075 | rankVal[weight] += length; |
| 2076 | } |
| 2077 | } |
| 2078 | |
| 2079 | size_t HUFv07_readDTableX4 (HUFv07_DTable* DTable, const void* src, size_t srcSize) |
| 2080 | { |
| 2081 | BYTE weightList[HUFv07_SYMBOLVALUE_MAX + 1]; |
| 2082 | sortedSymbol_t sortedSymbol[HUFv07_SYMBOLVALUE_MAX + 1]; |
| 2083 | U32 rankStats[HUFv07_TABLELOG_ABSOLUTEMAX + 1] = { 0 }; |
| 2084 | U32 rankStart0[HUFv07_TABLELOG_ABSOLUTEMAX + 2] = { 0 }; |
| 2085 | U32* const rankStart = rankStart0+1; |
| 2086 | rankVal_t rankVal; |
| 2087 | U32 tableLog, maxW, sizeOfSort, nbSymbols; |
| 2088 | DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 2089 | U32 const maxTableLog = dtd.maxTableLog; |
| 2090 | size_t iSize; |
| 2091 | void* dtPtr = DTable+1; /* force compiler to avoid strict-aliasing */ |
| 2092 | HUFv07_DEltX4* const dt = (HUFv07_DEltX4*)dtPtr; |
| 2093 | |
| 2094 | HUFv07_STATIC_ASSERT(sizeof(HUFv07_DEltX4) == sizeof(HUFv07_DTable)); /* if compilation fails here, assertion is false */ |
| 2095 | if (maxTableLog > HUFv07_TABLELOG_ABSOLUTEMAX) return ERROR(tableLog_tooLarge); |
| 2096 | /* memset(weightList, 0, sizeof(weightList)); */ /* is not necessary, even though some analyzer complain ... */ |
| 2097 | |
| 2098 | iSize = HUFv07_readStats(weightList, HUFv07_SYMBOLVALUE_MAX + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); |
| 2099 | if (HUFv07_isError(iSize)) return iSize; |
| 2100 | |
| 2101 | /* check result */ |
| 2102 | if (tableLog > maxTableLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ |
| 2103 | |
| 2104 | /* find maxWeight */ |
| 2105 | for (maxW = tableLog; rankStats[maxW]==0; maxW--) {} /* necessarily finds a solution before 0 */ |
| 2106 | |
| 2107 | /* Get start index of each weight */ |
| 2108 | { U32 w, nextRankStart = 0; |
| 2109 | for (w=1; w<maxW+1; w++) { |
| 2110 | U32 current = nextRankStart; |
| 2111 | nextRankStart += rankStats[w]; |
| 2112 | rankStart[w] = current; |
| 2113 | } |
| 2114 | rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ |
| 2115 | sizeOfSort = nextRankStart; |
| 2116 | } |
| 2117 | |
| 2118 | /* sort symbols by weight */ |
| 2119 | { U32 s; |
| 2120 | for (s=0; s<nbSymbols; s++) { |
| 2121 | U32 const w = weightList[s]; |
| 2122 | U32 const r = rankStart[w]++; |
| 2123 | sortedSymbol[r].symbol = (BYTE)s; |
| 2124 | sortedSymbol[r].weight = (BYTE)w; |
| 2125 | } |
| 2126 | rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */ |
| 2127 | } |
| 2128 | |
| 2129 | /* Build rankVal */ |
| 2130 | { U32* const rankVal0 = rankVal[0]; |
| 2131 | { int const rescale = (maxTableLog-tableLog) - 1; /* tableLog <= maxTableLog */ |
| 2132 | U32 nextRankVal = 0; |
| 2133 | U32 w; |
| 2134 | for (w=1; w<maxW+1; w++) { |
| 2135 | U32 current = nextRankVal; |
| 2136 | nextRankVal += rankStats[w] << (w+rescale); |
| 2137 | rankVal0[w] = current; |
| 2138 | } } |
| 2139 | { U32 const minBits = tableLog+1 - maxW; |
| 2140 | U32 consumed; |
| 2141 | for (consumed = minBits; consumed < maxTableLog - minBits + 1; consumed++) { |
| 2142 | U32* const rankValPtr = rankVal[consumed]; |
| 2143 | U32 w; |
| 2144 | for (w = 1; w < maxW+1; w++) { |
| 2145 | rankValPtr[w] = rankVal0[w] >> consumed; |
| 2146 | } } } } |
| 2147 | |
| 2148 | HUFv07_fillDTableX4(dt, maxTableLog, |
| 2149 | sortedSymbol, sizeOfSort, |
| 2150 | rankStart0, rankVal, maxW, |
| 2151 | tableLog+1); |
| 2152 | |
| 2153 | dtd.tableLog = (BYTE)maxTableLog; |
| 2154 | dtd.tableType = 1; |
| 2155 | memcpy(DTable, &dtd, sizeof(dtd)); |
| 2156 | return iSize; |
| 2157 | } |
| 2158 | |
| 2159 | |
| 2160 | static U32 HUFv07_decodeSymbolX4(void* op, BITv07_DStream_t* DStream, const HUFv07_DEltX4* dt, const U32 dtLog) |
| 2161 | { |
| 2162 | const size_t val = BITv07_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
| 2163 | memcpy(op, dt+val, 2); |
| 2164 | BITv07_skipBits(DStream, dt[val].nbBits); |
| 2165 | return dt[val].length; |
| 2166 | } |
| 2167 | |
| 2168 | static U32 HUFv07_decodeLastSymbolX4(void* op, BITv07_DStream_t* DStream, const HUFv07_DEltX4* dt, const U32 dtLog) |
| 2169 | { |
| 2170 | const size_t val = BITv07_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
| 2171 | memcpy(op, dt+val, 1); |
| 2172 | if (dt[val].length==1) BITv07_skipBits(DStream, dt[val].nbBits); |
| 2173 | else { |
| 2174 | if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) { |
| 2175 | BITv07_skipBits(DStream, dt[val].nbBits); |
| 2176 | if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) |
| 2177 | DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ |
| 2178 | } } |
| 2179 | return 1; |
| 2180 | } |
| 2181 | |
| 2182 | |
| 2183 | #define HUFv07_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ |
| 2184 | ptr += HUFv07_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2185 | |
| 2186 | #define HUFv07_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ |
| 2187 | if (MEM_64bits() || (HUFv07_TABLELOG_MAX<=12)) \ |
| 2188 | ptr += HUFv07_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2189 | |
| 2190 | #define HUFv07_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ |
| 2191 | if (MEM_64bits()) \ |
| 2192 | ptr += HUFv07_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2193 | |
| 2194 | static inline size_t HUFv07_decodeStreamX4(BYTE* p, BITv07_DStream_t* bitDPtr, BYTE* const pEnd, const HUFv07_DEltX4* const dt, const U32 dtLog) |
| 2195 | { |
| 2196 | BYTE* const pStart = p; |
| 2197 | |
| 2198 | /* up to 8 symbols at a time */ |
| 2199 | while ((BITv07_reloadDStream(bitDPtr) == BITv07_DStream_unfinished) && (p < pEnd-7)) { |
| 2200 | HUFv07_DECODE_SYMBOLX4_2(p, bitDPtr); |
| 2201 | HUFv07_DECODE_SYMBOLX4_1(p, bitDPtr); |
| 2202 | HUFv07_DECODE_SYMBOLX4_2(p, bitDPtr); |
| 2203 | HUFv07_DECODE_SYMBOLX4_0(p, bitDPtr); |
| 2204 | } |
| 2205 | |
| 2206 | /* closer to end : up to 2 symbols at a time */ |
| 2207 | while ((BITv07_reloadDStream(bitDPtr) == BITv07_DStream_unfinished) && (p <= pEnd-2)) |
| 2208 | HUFv07_DECODE_SYMBOLX4_0(p, bitDPtr); |
| 2209 | |
| 2210 | while (p <= pEnd-2) |
| 2211 | HUFv07_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ |
| 2212 | |
| 2213 | if (p < pEnd) |
| 2214 | p += HUFv07_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); |
| 2215 | |
| 2216 | return p-pStart; |
| 2217 | } |
| 2218 | |
| 2219 | |
| 2220 | static size_t HUFv07_decompress1X4_usingDTable_internal( |
| 2221 | void* dst, size_t dstSize, |
| 2222 | const void* cSrc, size_t cSrcSize, |
| 2223 | const HUFv07_DTable* DTable) |
| 2224 | { |
| 2225 | BITv07_DStream_t bitD; |
| 2226 | |
| 2227 | /* Init */ |
| 2228 | { size_t const errorCode = BITv07_initDStream(&bitD, cSrc, cSrcSize); |
| 2229 | if (HUFv07_isError(errorCode)) return errorCode; |
| 2230 | } |
| 2231 | |
| 2232 | /* decode */ |
| 2233 | { BYTE* const ostart = (BYTE*) dst; |
| 2234 | BYTE* const oend = ostart + dstSize; |
| 2235 | const void* const dtPtr = DTable+1; /* force compiler to not use strict-aliasing */ |
| 2236 | const HUFv07_DEltX4* const dt = (const HUFv07_DEltX4*)dtPtr; |
| 2237 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 2238 | HUFv07_decodeStreamX4(ostart, &bitD, oend, dt, dtd.tableLog); |
| 2239 | } |
| 2240 | |
| 2241 | /* check */ |
| 2242 | if (!BITv07_endOfDStream(&bitD)) return ERROR(corruption_detected); |
| 2243 | |
| 2244 | /* decoded size */ |
| 2245 | return dstSize; |
| 2246 | } |
| 2247 | |
| 2248 | size_t HUFv07_decompress1X4_usingDTable( |
| 2249 | void* dst, size_t dstSize, |
| 2250 | const void* cSrc, size_t cSrcSize, |
| 2251 | const HUFv07_DTable* DTable) |
| 2252 | { |
| 2253 | DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 2254 | if (dtd.tableType != 1) return ERROR(GENERIC); |
| 2255 | return HUFv07_decompress1X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
| 2256 | } |
| 2257 | |
| 2258 | size_t HUFv07_decompress1X4_DCtx (HUFv07_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2259 | { |
| 2260 | const BYTE* ip = (const BYTE*) cSrc; |
| 2261 | |
| 2262 | size_t const hSize = HUFv07_readDTableX4 (DCtx, cSrc, cSrcSize); |
| 2263 | if (HUFv07_isError(hSize)) return hSize; |
| 2264 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
| 2265 | ip += hSize; cSrcSize -= hSize; |
| 2266 | |
| 2267 | return HUFv07_decompress1X4_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); |
| 2268 | } |
| 2269 | |
| 2270 | size_t HUFv07_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2271 | { |
| 2272 | HUFv07_CREATE_STATIC_DTABLEX4(DTable, HUFv07_TABLELOG_MAX); |
| 2273 | return HUFv07_decompress1X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
| 2274 | } |
| 2275 | |
| 2276 | static size_t HUFv07_decompress4X4_usingDTable_internal( |
| 2277 | void* dst, size_t dstSize, |
| 2278 | const void* cSrc, size_t cSrcSize, |
| 2279 | const HUFv07_DTable* DTable) |
| 2280 | { |
| 2281 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
| 2282 | |
| 2283 | { const BYTE* const istart = (const BYTE*) cSrc; |
| 2284 | BYTE* const ostart = (BYTE*) dst; |
| 2285 | BYTE* const oend = ostart + dstSize; |
| 2286 | const void* const dtPtr = DTable+1; |
| 2287 | const HUFv07_DEltX4* const dt = (const HUFv07_DEltX4*)dtPtr; |
| 2288 | |
| 2289 | /* Init */ |
| 2290 | BITv07_DStream_t bitD1; |
| 2291 | BITv07_DStream_t bitD2; |
| 2292 | BITv07_DStream_t bitD3; |
| 2293 | BITv07_DStream_t bitD4; |
| 2294 | size_t const length1 = MEM_readLE16(istart); |
| 2295 | size_t const length2 = MEM_readLE16(istart+2); |
| 2296 | size_t const length3 = MEM_readLE16(istart+4); |
| 2297 | size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); |
| 2298 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
| 2299 | const BYTE* const istart2 = istart1 + length1; |
| 2300 | const BYTE* const istart3 = istart2 + length2; |
| 2301 | const BYTE* const istart4 = istart3 + length3; |
| 2302 | size_t const segmentSize = (dstSize+3) / 4; |
| 2303 | BYTE* const opStart2 = ostart + segmentSize; |
| 2304 | BYTE* const opStart3 = opStart2 + segmentSize; |
| 2305 | BYTE* const opStart4 = opStart3 + segmentSize; |
| 2306 | BYTE* op1 = ostart; |
| 2307 | BYTE* op2 = opStart2; |
| 2308 | BYTE* op3 = opStart3; |
| 2309 | BYTE* op4 = opStart4; |
| 2310 | U32 endSignal; |
| 2311 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 2312 | U32 const dtLog = dtd.tableLog; |
| 2313 | |
| 2314 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
| 2315 | { size_t const errorCode = BITv07_initDStream(&bitD1, istart1, length1); |
| 2316 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 2317 | { size_t const errorCode = BITv07_initDStream(&bitD2, istart2, length2); |
| 2318 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 2319 | { size_t const errorCode = BITv07_initDStream(&bitD3, istart3, length3); |
| 2320 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 2321 | { size_t const errorCode = BITv07_initDStream(&bitD4, istart4, length4); |
| 2322 | if (HUFv07_isError(errorCode)) return errorCode; } |
| 2323 | |
| 2324 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
| 2325 | endSignal = BITv07_reloadDStream(&bitD1) | BITv07_reloadDStream(&bitD2) | BITv07_reloadDStream(&bitD3) | BITv07_reloadDStream(&bitD4); |
| 2326 | for ( ; (endSignal==BITv07_DStream_unfinished) && (op4<(oend-7)) ; ) { |
| 2327 | HUFv07_DECODE_SYMBOLX4_2(op1, &bitD1); |
| 2328 | HUFv07_DECODE_SYMBOLX4_2(op2, &bitD2); |
| 2329 | HUFv07_DECODE_SYMBOLX4_2(op3, &bitD3); |
| 2330 | HUFv07_DECODE_SYMBOLX4_2(op4, &bitD4); |
| 2331 | HUFv07_DECODE_SYMBOLX4_1(op1, &bitD1); |
| 2332 | HUFv07_DECODE_SYMBOLX4_1(op2, &bitD2); |
| 2333 | HUFv07_DECODE_SYMBOLX4_1(op3, &bitD3); |
| 2334 | HUFv07_DECODE_SYMBOLX4_1(op4, &bitD4); |
| 2335 | HUFv07_DECODE_SYMBOLX4_2(op1, &bitD1); |
| 2336 | HUFv07_DECODE_SYMBOLX4_2(op2, &bitD2); |
| 2337 | HUFv07_DECODE_SYMBOLX4_2(op3, &bitD3); |
| 2338 | HUFv07_DECODE_SYMBOLX4_2(op4, &bitD4); |
| 2339 | HUFv07_DECODE_SYMBOLX4_0(op1, &bitD1); |
| 2340 | HUFv07_DECODE_SYMBOLX4_0(op2, &bitD2); |
| 2341 | HUFv07_DECODE_SYMBOLX4_0(op3, &bitD3); |
| 2342 | HUFv07_DECODE_SYMBOLX4_0(op4, &bitD4); |
| 2343 | |
| 2344 | endSignal = BITv07_reloadDStream(&bitD1) | BITv07_reloadDStream(&bitD2) | BITv07_reloadDStream(&bitD3) | BITv07_reloadDStream(&bitD4); |
| 2345 | } |
| 2346 | |
| 2347 | /* check corruption */ |
| 2348 | if (op1 > opStart2) return ERROR(corruption_detected); |
| 2349 | if (op2 > opStart3) return ERROR(corruption_detected); |
| 2350 | if (op3 > opStart4) return ERROR(corruption_detected); |
| 2351 | /* note : op4 supposed already verified within main loop */ |
| 2352 | |
| 2353 | /* finish bitStreams one by one */ |
| 2354 | HUFv07_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); |
| 2355 | HUFv07_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); |
| 2356 | HUFv07_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); |
| 2357 | HUFv07_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); |
| 2358 | |
| 2359 | /* check */ |
| 2360 | { U32 const endCheck = BITv07_endOfDStream(&bitD1) & BITv07_endOfDStream(&bitD2) & BITv07_endOfDStream(&bitD3) & BITv07_endOfDStream(&bitD4); |
| 2361 | if (!endCheck) return ERROR(corruption_detected); } |
| 2362 | |
| 2363 | /* decoded size */ |
| 2364 | return dstSize; |
| 2365 | } |
| 2366 | } |
| 2367 | |
| 2368 | |
| 2369 | size_t HUFv07_decompress4X4_usingDTable( |
| 2370 | void* dst, size_t dstSize, |
| 2371 | const void* cSrc, size_t cSrcSize, |
| 2372 | const HUFv07_DTable* DTable) |
| 2373 | { |
| 2374 | DTableDesc dtd = HUFv07_getDTableDesc(DTable); |
| 2375 | if (dtd.tableType != 1) return ERROR(GENERIC); |
| 2376 | return HUFv07_decompress4X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
| 2377 | } |
| 2378 | |
| 2379 | |
| 2380 | size_t HUFv07_decompress4X4_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2381 | { |
| 2382 | const BYTE* ip = (const BYTE*) cSrc; |
| 2383 | |
| 2384 | size_t hSize = HUFv07_readDTableX4 (dctx, cSrc, cSrcSize); |
| 2385 | if (HUFv07_isError(hSize)) return hSize; |
| 2386 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
| 2387 | ip += hSize; cSrcSize -= hSize; |
| 2388 | |
| 2389 | return HUFv07_decompress4X4_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx); |
| 2390 | } |
| 2391 | |
| 2392 | size_t HUFv07_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2393 | { |
| 2394 | HUFv07_CREATE_STATIC_DTABLEX4(DTable, HUFv07_TABLELOG_MAX); |
| 2395 | return HUFv07_decompress4X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
| 2396 | } |
| 2397 | |
| 2398 | |
| 2399 | /* ********************************/ |
| 2400 | /* Generic decompression selector */ |
| 2401 | /* ********************************/ |
| 2402 | |
| 2403 | size_t HUFv07_decompress1X_usingDTable(void* dst, size_t maxDstSize, |
| 2404 | const void* cSrc, size_t cSrcSize, |
| 2405 | const HUFv07_DTable* DTable) |
| 2406 | { |
| 2407 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 2408 | return dtd.tableType ? HUFv07_decompress1X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : |
| 2409 | HUFv07_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); |
| 2410 | } |
| 2411 | |
| 2412 | size_t HUFv07_decompress4X_usingDTable(void* dst, size_t maxDstSize, |
| 2413 | const void* cSrc, size_t cSrcSize, |
| 2414 | const HUFv07_DTable* DTable) |
| 2415 | { |
| 2416 | DTableDesc const dtd = HUFv07_getDTableDesc(DTable); |
| 2417 | return dtd.tableType ? HUFv07_decompress4X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : |
| 2418 | HUFv07_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); |
| 2419 | } |
| 2420 | |
| 2421 | |
| 2422 | typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; |
| 2423 | static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = |
| 2424 | { |
| 2425 | /* single, double, quad */ |
| 2426 | {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ |
| 2427 | {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ |
| 2428 | {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ |
| 2429 | {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ |
| 2430 | {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ |
| 2431 | {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ |
| 2432 | {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ |
| 2433 | {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ |
| 2434 | {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ |
| 2435 | {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ |
| 2436 | {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ |
| 2437 | {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ |
| 2438 | {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ |
| 2439 | {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ |
| 2440 | {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ |
| 2441 | {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ |
| 2442 | }; |
| 2443 | |
| 2444 | /** HUFv07_selectDecoder() : |
| 2445 | * Tells which decoder is likely to decode faster, |
| 2446 | * based on a set of pre-determined metrics. |
| 2447 | * @return : 0==HUFv07_decompress4X2, 1==HUFv07_decompress4X4 . |
| 2448 | * Assumption : 0 < cSrcSize < dstSize <= 128 KB */ |
| 2449 | U32 HUFv07_selectDecoder (size_t dstSize, size_t cSrcSize) |
| 2450 | { |
| 2451 | /* decoder timing evaluation */ |
| 2452 | U32 const Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */ |
| 2453 | U32 const D256 = (U32)(dstSize >> 8); |
| 2454 | U32 const DTime0 = algoTime[Q][0].tableTime + (algoTime[Q][0].decode256Time * D256); |
| 2455 | U32 DTime1 = algoTime[Q][1].tableTime + (algoTime[Q][1].decode256Time * D256); |
| 2456 | DTime1 += DTime1 >> 3; /* advantage to algorithm using less memory, for cache eviction */ |
| 2457 | |
| 2458 | return DTime1 < DTime0; |
| 2459 | } |
| 2460 | |
| 2461 | |
| 2462 | typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); |
| 2463 | |
| 2464 | size_t HUFv07_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2465 | { |
| 2466 | static const decompressionAlgo decompress[2] = { HUFv07_decompress4X2, HUFv07_decompress4X4 }; |
| 2467 | |
| 2468 | /* validation checks */ |
| 2469 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
| 2470 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
| 2471 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
| 2472 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
| 2473 | |
| 2474 | { U32 const algoNb = HUFv07_selectDecoder(dstSize, cSrcSize); |
| 2475 | return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); |
| 2476 | } |
| 2477 | |
| 2478 | /* return HUFv07_decompress4X2(dst, dstSize, cSrc, cSrcSize); */ /* multi-streams single-symbol decoding */ |
| 2479 | /* return HUFv07_decompress4X4(dst, dstSize, cSrc, cSrcSize); */ /* multi-streams double-symbols decoding */ |
| 2480 | } |
| 2481 | |
| 2482 | size_t HUFv07_decompress4X_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2483 | { |
| 2484 | /* validation checks */ |
| 2485 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
| 2486 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
| 2487 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
| 2488 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
| 2489 | |
| 2490 | { U32 const algoNb = HUFv07_selectDecoder(dstSize, cSrcSize); |
| 2491 | return algoNb ? HUFv07_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
| 2492 | HUFv07_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
| 2493 | } |
| 2494 | } |
| 2495 | |
| 2496 | size_t HUFv07_decompress4X_hufOnly (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2497 | { |
| 2498 | /* validation checks */ |
| 2499 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
| 2500 | if ((cSrcSize >= dstSize) || (cSrcSize <= 1)) return ERROR(corruption_detected); /* invalid */ |
| 2501 | |
| 2502 | { U32 const algoNb = HUFv07_selectDecoder(dstSize, cSrcSize); |
| 2503 | return algoNb ? HUFv07_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
| 2504 | HUFv07_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
| 2505 | } |
| 2506 | } |
| 2507 | |
| 2508 | size_t HUFv07_decompress1X_DCtx (HUFv07_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2509 | { |
| 2510 | /* validation checks */ |
| 2511 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
| 2512 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
| 2513 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
| 2514 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
| 2515 | |
| 2516 | { U32 const algoNb = HUFv07_selectDecoder(dstSize, cSrcSize); |
| 2517 | return algoNb ? HUFv07_decompress1X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
| 2518 | HUFv07_decompress1X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
| 2519 | } |
| 2520 | } |
| 2521 | /* |
| 2522 | Common functions of Zstd compression library |
| 2523 | Copyright (C) 2015-2016, Yann Collet. |
| 2524 | |
| 2525 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 2526 | |
| 2527 | Redistribution and use in source and binary forms, with or without |
| 2528 | modification, are permitted provided that the following conditions are |
| 2529 | met: |
| 2530 | * Redistributions of source code must retain the above copyright |
| 2531 | notice, this list of conditions and the following disclaimer. |
| 2532 | * Redistributions in binary form must reproduce the above |
| 2533 | copyright notice, this list of conditions and the following disclaimer |
| 2534 | in the documentation and/or other materials provided with the |
| 2535 | distribution. |
| 2536 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 2537 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 2538 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 2539 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 2540 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 2541 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 2542 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 2543 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 2544 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 2545 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 2546 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 2547 | |
| 2548 | You can contact the author at : |
| 2549 | - zstd homepage : https://facebook.github.io/zstd/ |
| 2550 | */ |
| 2551 | |
| 2552 | |
| 2553 | |
| 2554 | /*-**************************************** |
| 2555 | * ZSTD Error Management |
| 2556 | ******************************************/ |
| 2557 | /*! ZSTDv07_isError() : |
| 2558 | * tells if a return value is an error code */ |
| 2559 | unsigned ZSTDv07_isError(size_t code) { return ERR_isError(code); } |
| 2560 | |
| 2561 | /*! ZSTDv07_getErrorName() : |
| 2562 | * provides error code string from function result (useful for debugging) */ |
| 2563 | const char* ZSTDv07_getErrorName(size_t code) { return ERR_getErrorName(code); } |
| 2564 | |
| 2565 | |
| 2566 | |
| 2567 | /* ************************************************************** |
| 2568 | * ZBUFF Error Management |
| 2569 | ****************************************************************/ |
| 2570 | unsigned ZBUFFv07_isError(size_t errorCode) { return ERR_isError(errorCode); } |
| 2571 | |
| 2572 | const char* ZBUFFv07_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); } |
| 2573 | |
| 2574 | |
| 2575 | |
| 2576 | static void* ZSTDv07_defaultAllocFunction(void* opaque, size_t size) |
| 2577 | { |
| 2578 | void* address = malloc(size); |
| 2579 | (void)opaque; |
| 2580 | /* printf("alloc %p, %d opaque=%p \n", address, (int)size, opaque); */ |
| 2581 | return address; |
| 2582 | } |
| 2583 | |
| 2584 | static void ZSTDv07_defaultFreeFunction(void* opaque, void* address) |
| 2585 | { |
| 2586 | (void)opaque; |
| 2587 | /* if (address) printf("free %p opaque=%p \n", address, opaque); */ |
| 2588 | free(address); |
| 2589 | } |
| 2590 | /* |
| 2591 | zstd_internal - common functions to include |
| 2592 | Header File for include |
| 2593 | Copyright (C) 2014-2016, Yann Collet. |
| 2594 | |
| 2595 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 2596 | |
| 2597 | Redistribution and use in source and binary forms, with or without |
| 2598 | modification, are permitted provided that the following conditions are |
| 2599 | met: |
| 2600 | * Redistributions of source code must retain the above copyright |
| 2601 | notice, this list of conditions and the following disclaimer. |
| 2602 | * Redistributions in binary form must reproduce the above |
| 2603 | copyright notice, this list of conditions and the following disclaimer |
| 2604 | in the documentation and/or other materials provided with the |
| 2605 | distribution. |
| 2606 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 2607 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 2608 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 2609 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 2610 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 2611 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 2612 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 2613 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 2614 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 2615 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 2616 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 2617 | |
| 2618 | You can contact the author at : |
| 2619 | - zstd homepage : https://www.zstd.net |
| 2620 | */ |
| 2621 | #ifndef ZSTDv07_CCOMMON_H_MODULE |
| 2622 | #define ZSTDv07_CCOMMON_H_MODULE |
| 2623 | |
| 2624 | |
| 2625 | /*-************************************* |
| 2626 | * Common macros |
| 2627 | ***************************************/ |
| 2628 | #define MIN(a,b) ((a)<(b) ? (a) : (b)) |
| 2629 | #define MAX(a,b) ((a)>(b) ? (a) : (b)) |
| 2630 | |
| 2631 | |
| 2632 | /*-************************************* |
| 2633 | * Common constants |
| 2634 | ***************************************/ |
| 2635 | #define ZSTDv07_OPT_NUM (1<<12) |
| 2636 | #define ZSTDv07_DICT_MAGIC 0xEC30A437 /* v0.7 */ |
| 2637 | |
| 2638 | #define ZSTDv07_REP_NUM 3 |
| 2639 | #define ZSTDv07_REP_INIT ZSTDv07_REP_NUM |
| 2640 | #define ZSTDv07_REP_MOVE (ZSTDv07_REP_NUM-1) |
| 2641 | static const U32 repStartValue[ZSTDv07_REP_NUM] = { 1, 4, 8 }; |
| 2642 | |
| 2643 | #define KB *(1 <<10) |
| 2644 | #define MB *(1 <<20) |
| 2645 | #define GB *(1U<<30) |
| 2646 | |
| 2647 | #define BIT7 128 |
| 2648 | #define BIT6 64 |
| 2649 | #define BIT5 32 |
| 2650 | #define BIT4 16 |
| 2651 | #define BIT1 2 |
| 2652 | #define BIT0 1 |
| 2653 | |
| 2654 | #define ZSTDv07_WINDOWLOG_ABSOLUTEMIN 10 |
| 2655 | static const size_t ZSTDv07_fcs_fieldSize[4] = { 0, 2, 4, 8 }; |
| 2656 | static const size_t ZSTDv07_did_fieldSize[4] = { 0, 1, 2, 4 }; |
| 2657 | |
| 2658 | #define ZSTDv07_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */ |
| 2659 | static const size_t ZSTDv07_blockHeaderSize = ZSTDv07_BLOCKHEADERSIZE; |
| 2660 | typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t; |
| 2661 | |
| 2662 | #define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */ |
| 2663 | #define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */ |
| 2664 | |
| 2665 | #define ZSTD_HUFFDTABLE_CAPACITY_LOG 12 |
| 2666 | typedef enum { lbt_huffman, lbt_repeat, lbt_raw, lbt_rle } litBlockType_t; |
| 2667 | |
| 2668 | #define LONGNBSEQ 0x7F00 |
| 2669 | |
| 2670 | #define MINMATCH 3 |
| 2671 | #define EQUAL_READ32 4 |
| 2672 | |
| 2673 | #define Litbits 8 |
| 2674 | #define MaxLit ((1<<Litbits) - 1) |
| 2675 | #define MaxML 52 |
| 2676 | #define MaxLL 35 |
| 2677 | #define MaxOff 28 |
| 2678 | #define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */ |
| 2679 | #define MLFSELog 9 |
| 2680 | #define LLFSELog 9 |
| 2681 | #define OffFSELog 8 |
| 2682 | |
| 2683 | #define FSEv07_ENCODING_RAW 0 |
| 2684 | #define FSEv07_ENCODING_RLE 1 |
| 2685 | #define FSEv07_ENCODING_STATIC 2 |
| 2686 | #define FSEv07_ENCODING_DYNAMIC 3 |
| 2687 | |
| 2688 | #define ZSTD_CONTENTSIZE_ERROR (0ULL - 2) |
| 2689 | |
| 2690 | static const U32 LL_bits[MaxLL+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 2691 | 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9,10,11,12, |
| 2692 | 13,14,15,16 }; |
| 2693 | static const S16 LL_defaultNorm[MaxLL+1] = { 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, |
| 2694 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1, |
| 2695 | -1,-1,-1,-1 }; |
| 2696 | static const U32 LL_defaultNormLog = 6; |
| 2697 | |
| 2698 | static const U32 ML_bits[MaxML+1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 2699 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 2700 | 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9,10,11, |
| 2701 | 12,13,14,15,16 }; |
| 2702 | static const S16 ML_defaultNorm[MaxML+1] = { 1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, |
| 2703 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 2704 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,-1,-1, |
| 2705 | -1,-1,-1,-1,-1 }; |
| 2706 | static const U32 ML_defaultNormLog = 6; |
| 2707 | |
| 2708 | static const S16 OF_defaultNorm[MaxOff+1] = { 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, |
| 2709 | 1, 1, 1, 1, 1, 1, 1, 1,-1,-1,-1,-1,-1 }; |
| 2710 | static const U32 OF_defaultNormLog = 5; |
| 2711 | |
| 2712 | |
| 2713 | /*-******************************************* |
| 2714 | * Shared functions to include for inlining |
| 2715 | *********************************************/ |
| 2716 | static void ZSTDv07_copy8(void* dst, const void* src) { memcpy(dst, src, 8); } |
| 2717 | #define COPY8(d,s) { ZSTDv07_copy8(d,s); d+=8; s+=8; } |
| 2718 | |
| 2719 | /*! ZSTDv07_wildcopy() : |
| 2720 | * custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */ |
| 2721 | #define WILDCOPY_OVERLENGTH 8 |
| 2722 | MEM_STATIC void ZSTDv07_wildcopy(void* dst, const void* src, ptrdiff_t length) |
| 2723 | { |
| 2724 | const BYTE* ip = (const BYTE*)src; |
| 2725 | BYTE* op = (BYTE*)dst; |
| 2726 | BYTE* const oend = op + length; |
| 2727 | do |
| 2728 | COPY8(op, ip) |
| 2729 | while (op < oend); |
| 2730 | } |
| 2731 | |
| 2732 | |
| 2733 | /*-******************************************* |
| 2734 | * Private interfaces |
| 2735 | *********************************************/ |
| 2736 | typedef struct ZSTDv07_stats_s ZSTDv07_stats_t; |
| 2737 | |
| 2738 | typedef struct { |
| 2739 | U32 off; |
| 2740 | U32 len; |
| 2741 | } ZSTDv07_match_t; |
| 2742 | |
| 2743 | typedef struct { |
| 2744 | U32 price; |
| 2745 | U32 off; |
| 2746 | U32 mlen; |
| 2747 | U32 litlen; |
| 2748 | U32 rep[ZSTDv07_REP_INIT]; |
| 2749 | } ZSTDv07_optimal_t; |
| 2750 | |
| 2751 | struct ZSTDv07_stats_s { U32 unused; }; |
| 2752 | |
| 2753 | typedef struct { |
| 2754 | void* buffer; |
| 2755 | U32* offsetStart; |
| 2756 | U32* offset; |
| 2757 | BYTE* offCodeStart; |
| 2758 | BYTE* litStart; |
| 2759 | BYTE* lit; |
| 2760 | U16* litLengthStart; |
| 2761 | U16* litLength; |
| 2762 | BYTE* llCodeStart; |
| 2763 | U16* matchLengthStart; |
| 2764 | U16* matchLength; |
| 2765 | BYTE* mlCodeStart; |
| 2766 | U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */ |
| 2767 | U32 longLengthPos; |
| 2768 | /* opt */ |
| 2769 | ZSTDv07_optimal_t* priceTable; |
| 2770 | ZSTDv07_match_t* matchTable; |
| 2771 | U32* matchLengthFreq; |
| 2772 | U32* litLengthFreq; |
| 2773 | U32* litFreq; |
| 2774 | U32* offCodeFreq; |
| 2775 | U32 matchLengthSum; |
| 2776 | U32 matchSum; |
| 2777 | U32 litLengthSum; |
| 2778 | U32 litSum; |
| 2779 | U32 offCodeSum; |
| 2780 | U32 log2matchLengthSum; |
| 2781 | U32 log2matchSum; |
| 2782 | U32 log2litLengthSum; |
| 2783 | U32 log2litSum; |
| 2784 | U32 log2offCodeSum; |
| 2785 | U32 factor; |
| 2786 | U32 cachedPrice; |
| 2787 | U32 cachedLitLength; |
| 2788 | const BYTE* cachedLiterals; |
| 2789 | ZSTDv07_stats_t stats; |
| 2790 | } seqStore_t; |
| 2791 | |
| 2792 | void ZSTDv07_seqToCodes(const seqStore_t* seqStorePtr, size_t const nbSeq); |
| 2793 | |
| 2794 | /* custom memory allocation functions */ |
| 2795 | static const ZSTDv07_customMem defaultCustomMem = { ZSTDv07_defaultAllocFunction, ZSTDv07_defaultFreeFunction, NULL }; |
| 2796 | |
| 2797 | #endif /* ZSTDv07_CCOMMON_H_MODULE */ |
| 2798 | /* |
| 2799 | zstd - standard compression library |
| 2800 | Copyright (C) 2014-2016, Yann Collet. |
| 2801 | |
| 2802 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 2803 | |
| 2804 | Redistribution and use in source and binary forms, with or without |
| 2805 | modification, are permitted provided that the following conditions are |
| 2806 | met: |
| 2807 | * Redistributions of source code must retain the above copyright |
| 2808 | notice, this list of conditions and the following disclaimer. |
| 2809 | * Redistributions in binary form must reproduce the above |
| 2810 | copyright notice, this list of conditions and the following disclaimer |
| 2811 | in the documentation and/or other materials provided with the |
| 2812 | distribution. |
| 2813 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 2814 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 2815 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 2816 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 2817 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 2818 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 2819 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 2820 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 2821 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 2822 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 2823 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 2824 | |
| 2825 | You can contact the author at : |
| 2826 | - zstd homepage : https://facebook.github.io/zstd |
| 2827 | */ |
| 2828 | |
| 2829 | /* *************************************************************** |
| 2830 | * Tuning parameters |
| 2831 | *****************************************************************/ |
| 2832 | /*! |
| 2833 | * HEAPMODE : |
| 2834 | * Select how default decompression function ZSTDv07_decompress() will allocate memory, |
| 2835 | * in memory stack (0), or in memory heap (1, requires malloc()) |
| 2836 | */ |
| 2837 | #ifndef ZSTDv07_HEAPMODE |
| 2838 | # define ZSTDv07_HEAPMODE 1 |
| 2839 | #endif |
| 2840 | |
| 2841 | |
| 2842 | /*-******************************************************* |
| 2843 | * Compiler specifics |
| 2844 | *********************************************************/ |
| 2845 | #ifdef _MSC_VER /* Visual Studio */ |
| 2846 | # include <intrin.h> /* For Visual 2005 */ |
| 2847 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 2848 | # pragma warning(disable : 4324) /* disable: C4324: padded structure */ |
| 2849 | # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ |
| 2850 | #endif |
| 2851 | |
| 2852 | |
| 2853 | /*-************************************* |
| 2854 | * Macros |
| 2855 | ***************************************/ |
| 2856 | #define ZSTDv07_isError ERR_isError /* for inlining */ |
| 2857 | #define FSEv07_isError ERR_isError |
| 2858 | #define HUFv07_isError ERR_isError |
| 2859 | |
| 2860 | |
| 2861 | /*_******************************************************* |
| 2862 | * Memory operations |
| 2863 | **********************************************************/ |
| 2864 | static void ZSTDv07_copy4(void* dst, const void* src) { memcpy(dst, src, 4); } |
| 2865 | |
| 2866 | |
| 2867 | /*-************************************************************* |
| 2868 | * Context management |
| 2869 | ***************************************************************/ |
| 2870 | typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader, |
| 2871 | ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock, |
| 2872 | ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTDv07_dStage; |
| 2873 | |
| 2874 | struct ZSTDv07_DCtx_s |
| 2875 | { |
| 2876 | FSEv07_DTable LLTable[FSEv07_DTABLE_SIZE_U32(LLFSELog)]; |
| 2877 | FSEv07_DTable OffTable[FSEv07_DTABLE_SIZE_U32(OffFSELog)]; |
| 2878 | FSEv07_DTable MLTable[FSEv07_DTABLE_SIZE_U32(MLFSELog)]; |
| 2879 | HUFv07_DTable hufTable[HUFv07_DTABLE_SIZE(ZSTD_HUFFDTABLE_CAPACITY_LOG)]; /* can accommodate HUFv07_decompress4X */ |
| 2880 | const void* previousDstEnd; |
| 2881 | const void* base; |
| 2882 | const void* vBase; |
| 2883 | const void* dictEnd; |
| 2884 | size_t expected; |
| 2885 | U32 rep[3]; |
| 2886 | ZSTDv07_frameParams fParams; |
| 2887 | blockType_t bType; /* used in ZSTDv07_decompressContinue(), to transfer blockType between header decoding and block decoding stages */ |
| 2888 | ZSTDv07_dStage stage; |
| 2889 | U32 litEntropy; |
| 2890 | U32 fseEntropy; |
| 2891 | XXH64_state_t xxhState; |
| 2892 | size_t headerSize; |
| 2893 | U32 dictID; |
| 2894 | const BYTE* litPtr; |
| 2895 | ZSTDv07_customMem customMem; |
| 2896 | size_t litSize; |
| 2897 | BYTE litBuffer[ZSTDv07_BLOCKSIZE_ABSOLUTEMAX + WILDCOPY_OVERLENGTH]; |
| 2898 | BYTE headerBuffer[ZSTDv07_FRAMEHEADERSIZE_MAX]; |
| 2899 | }; /* typedef'd to ZSTDv07_DCtx within "zstd_static.h" */ |
| 2900 | |
| 2901 | int ZSTDv07_isSkipFrame(ZSTDv07_DCtx* dctx); |
| 2902 | |
| 2903 | size_t ZSTDv07_sizeofDCtx (const ZSTDv07_DCtx* dctx) { return sizeof(*dctx); } |
| 2904 | |
| 2905 | size_t ZSTDv07_estimateDCtxSize(void) { return sizeof(ZSTDv07_DCtx); } |
| 2906 | |
| 2907 | size_t ZSTDv07_decompressBegin(ZSTDv07_DCtx* dctx) |
| 2908 | { |
| 2909 | dctx->expected = ZSTDv07_frameHeaderSize_min; |
| 2910 | dctx->stage = ZSTDds_getFrameHeaderSize; |
| 2911 | dctx->previousDstEnd = NULL; |
| 2912 | dctx->base = NULL; |
| 2913 | dctx->vBase = NULL; |
| 2914 | dctx->dictEnd = NULL; |
| 2915 | dctx->hufTable[0] = (HUFv07_DTable)((ZSTD_HUFFDTABLE_CAPACITY_LOG)*0x1000001); |
| 2916 | dctx->litEntropy = dctx->fseEntropy = 0; |
| 2917 | dctx->dictID = 0; |
| 2918 | { int i; for (i=0; i<ZSTDv07_REP_NUM; i++) dctx->rep[i] = repStartValue[i]; } |
| 2919 | return 0; |
| 2920 | } |
| 2921 | |
| 2922 | ZSTDv07_DCtx* ZSTDv07_createDCtx_advanced(ZSTDv07_customMem customMem) |
| 2923 | { |
| 2924 | ZSTDv07_DCtx* dctx; |
| 2925 | |
| 2926 | if (!customMem.customAlloc && !customMem.customFree) |
| 2927 | customMem = defaultCustomMem; |
| 2928 | |
| 2929 | if (!customMem.customAlloc || !customMem.customFree) |
| 2930 | return NULL; |
| 2931 | |
| 2932 | dctx = (ZSTDv07_DCtx*) customMem.customAlloc(customMem.opaque, sizeof(ZSTDv07_DCtx)); |
| 2933 | if (!dctx) return NULL; |
| 2934 | memcpy(&dctx->customMem, &customMem, sizeof(ZSTDv07_customMem)); |
| 2935 | ZSTDv07_decompressBegin(dctx); |
| 2936 | return dctx; |
| 2937 | } |
| 2938 | |
| 2939 | ZSTDv07_DCtx* ZSTDv07_createDCtx(void) |
| 2940 | { |
| 2941 | return ZSTDv07_createDCtx_advanced(defaultCustomMem); |
| 2942 | } |
| 2943 | |
| 2944 | size_t ZSTDv07_freeDCtx(ZSTDv07_DCtx* dctx) |
| 2945 | { |
| 2946 | if (dctx==NULL) return 0; /* support free on NULL */ |
| 2947 | dctx->customMem.customFree(dctx->customMem.opaque, dctx); |
| 2948 | return 0; /* reserved as a potential error code in the future */ |
| 2949 | } |
| 2950 | |
| 2951 | void ZSTDv07_copyDCtx(ZSTDv07_DCtx* dstDCtx, const ZSTDv07_DCtx* srcDCtx) |
| 2952 | { |
| 2953 | memcpy(dstDCtx, srcDCtx, |
| 2954 | sizeof(ZSTDv07_DCtx) - (ZSTDv07_BLOCKSIZE_ABSOLUTEMAX+WILDCOPY_OVERLENGTH + ZSTDv07_frameHeaderSize_max)); /* no need to copy workspace */ |
| 2955 | } |
| 2956 | |
| 2957 | |
| 2958 | /*-************************************************************* |
| 2959 | * Decompression section |
| 2960 | ***************************************************************/ |
| 2961 | |
| 2962 | /* Frame format description |
| 2963 | Frame Header - [ Block Header - Block ] - Frame End |
| 2964 | 1) Frame Header |
| 2965 | - 4 bytes - Magic Number : ZSTDv07_MAGICNUMBER (defined within zstd.h) |
| 2966 | - 1 byte - Frame Descriptor |
| 2967 | 2) Block Header |
| 2968 | - 3 bytes, starting with a 2-bits descriptor |
| 2969 | Uncompressed, Compressed, Frame End, unused |
| 2970 | 3) Block |
| 2971 | See Block Format Description |
| 2972 | 4) Frame End |
| 2973 | - 3 bytes, compatible with Block Header |
| 2974 | */ |
| 2975 | |
| 2976 | |
| 2977 | /* Frame Header : |
| 2978 | |
| 2979 | 1 byte - FrameHeaderDescription : |
| 2980 | bit 0-1 : dictID (0, 1, 2 or 4 bytes) |
| 2981 | bit 2 : checksumFlag |
| 2982 | bit 3 : reserved (must be zero) |
| 2983 | bit 4 : reserved (unused, can be any value) |
| 2984 | bit 5 : Single Segment (if 1, WindowLog byte is not present) |
| 2985 | bit 6-7 : FrameContentFieldSize (0, 2, 4, or 8) |
| 2986 | if (SkippedWindowLog && !FrameContentFieldsize) FrameContentFieldsize=1; |
| 2987 | |
| 2988 | Optional : WindowLog (0 or 1 byte) |
| 2989 | bit 0-2 : octal Fractional (1/8th) |
| 2990 | bit 3-7 : Power of 2, with 0 = 1 KB (up to 2 TB) |
| 2991 | |
| 2992 | Optional : dictID (0, 1, 2 or 4 bytes) |
| 2993 | Automatic adaptation |
| 2994 | 0 : no dictID |
| 2995 | 1 : 1 - 255 |
| 2996 | 2 : 256 - 65535 |
| 2997 | 4 : all other values |
| 2998 | |
| 2999 | Optional : content size (0, 1, 2, 4 or 8 bytes) |
| 3000 | 0 : unknown (fcfs==0 and swl==0) |
| 3001 | 1 : 0-255 bytes (fcfs==0 and swl==1) |
| 3002 | 2 : 256 - 65535+256 (fcfs==1) |
| 3003 | 4 : 0 - 4GB-1 (fcfs==2) |
| 3004 | 8 : 0 - 16EB-1 (fcfs==3) |
| 3005 | */ |
| 3006 | |
| 3007 | |
| 3008 | /* Compressed Block, format description |
| 3009 | |
| 3010 | Block = Literal Section - Sequences Section |
| 3011 | Prerequisite : size of (compressed) block, maximum size of regenerated data |
| 3012 | |
| 3013 | 1) Literal Section |
| 3014 | |
| 3015 | 1.1) Header : 1-5 bytes |
| 3016 | flags: 2 bits |
| 3017 | 00 compressed by Huff0 |
| 3018 | 01 unused |
| 3019 | 10 is Raw (uncompressed) |
| 3020 | 11 is Rle |
| 3021 | Note : using 01 => Huff0 with precomputed table ? |
| 3022 | Note : delta map ? => compressed ? |
| 3023 | |
| 3024 | 1.1.1) Huff0-compressed literal block : 3-5 bytes |
| 3025 | srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream |
| 3026 | srcSize < 1 KB => 3 bytes (2-2-10-10) |
| 3027 | srcSize < 16KB => 4 bytes (2-2-14-14) |
| 3028 | else => 5 bytes (2-2-18-18) |
| 3029 | big endian convention |
| 3030 | |
| 3031 | 1.1.2) Raw (uncompressed) literal block header : 1-3 bytes |
| 3032 | size : 5 bits: (IS_RAW<<6) + (0<<4) + size |
| 3033 | 12 bits: (IS_RAW<<6) + (2<<4) + (size>>8) |
| 3034 | size&255 |
| 3035 | 20 bits: (IS_RAW<<6) + (3<<4) + (size>>16) |
| 3036 | size>>8&255 |
| 3037 | size&255 |
| 3038 | |
| 3039 | 1.1.3) Rle (repeated single byte) literal block header : 1-3 bytes |
| 3040 | size : 5 bits: (IS_RLE<<6) + (0<<4) + size |
| 3041 | 12 bits: (IS_RLE<<6) + (2<<4) + (size>>8) |
| 3042 | size&255 |
| 3043 | 20 bits: (IS_RLE<<6) + (3<<4) + (size>>16) |
| 3044 | size>>8&255 |
| 3045 | size&255 |
| 3046 | |
| 3047 | 1.1.4) Huff0-compressed literal block, using precomputed CTables : 3-5 bytes |
| 3048 | srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream |
| 3049 | srcSize < 1 KB => 3 bytes (2-2-10-10) |
| 3050 | srcSize < 16KB => 4 bytes (2-2-14-14) |
| 3051 | else => 5 bytes (2-2-18-18) |
| 3052 | big endian convention |
| 3053 | |
| 3054 | 1- CTable available (stored into workspace ?) |
| 3055 | 2- Small input (fast heuristic ? Full comparison ? depend on clevel ?) |
| 3056 | |
| 3057 | |
| 3058 | 1.2) Literal block content |
| 3059 | |
| 3060 | 1.2.1) Huff0 block, using sizes from header |
| 3061 | See Huff0 format |
| 3062 | |
| 3063 | 1.2.2) Huff0 block, using prepared table |
| 3064 | |
| 3065 | 1.2.3) Raw content |
| 3066 | |
| 3067 | 1.2.4) single byte |
| 3068 | |
| 3069 | |
| 3070 | 2) Sequences section |
| 3071 | TO DO |
| 3072 | */ |
| 3073 | |
| 3074 | /** ZSTDv07_frameHeaderSize() : |
| 3075 | * srcSize must be >= ZSTDv07_frameHeaderSize_min. |
| 3076 | * @return : size of the Frame Header */ |
| 3077 | static size_t ZSTDv07_frameHeaderSize(const void* src, size_t srcSize) |
| 3078 | { |
| 3079 | if (srcSize < ZSTDv07_frameHeaderSize_min) return ERROR(srcSize_wrong); |
| 3080 | { BYTE const fhd = ((const BYTE*)src)[4]; |
| 3081 | U32 const dictID= fhd & 3; |
| 3082 | U32 const directMode = (fhd >> 5) & 1; |
| 3083 | U32 const fcsId = fhd >> 6; |
| 3084 | return ZSTDv07_frameHeaderSize_min + !directMode + ZSTDv07_did_fieldSize[dictID] + ZSTDv07_fcs_fieldSize[fcsId] |
| 3085 | + (directMode && !ZSTDv07_fcs_fieldSize[fcsId]); |
| 3086 | } |
| 3087 | } |
| 3088 | |
| 3089 | |
| 3090 | /** ZSTDv07_getFrameParams() : |
| 3091 | * decode Frame Header, or require larger `srcSize`. |
| 3092 | * @return : 0, `fparamsPtr` is correctly filled, |
| 3093 | * >0, `srcSize` is too small, result is expected `srcSize`, |
| 3094 | * or an error code, which can be tested using ZSTDv07_isError() */ |
| 3095 | size_t ZSTDv07_getFrameParams(ZSTDv07_frameParams* fparamsPtr, const void* src, size_t srcSize) |
| 3096 | { |
| 3097 | const BYTE* ip = (const BYTE*)src; |
| 3098 | |
| 3099 | if (srcSize < ZSTDv07_frameHeaderSize_min) return ZSTDv07_frameHeaderSize_min; |
| 3100 | memset(fparamsPtr, 0, sizeof(*fparamsPtr)); |
| 3101 | if (MEM_readLE32(src) != ZSTDv07_MAGICNUMBER) { |
| 3102 | if ((MEM_readLE32(src) & 0xFFFFFFF0U) == ZSTDv07_MAGIC_SKIPPABLE_START) { |
| 3103 | if (srcSize < ZSTDv07_skippableHeaderSize) return ZSTDv07_skippableHeaderSize; /* magic number + skippable frame length */ |
| 3104 | fparamsPtr->frameContentSize = MEM_readLE32((const char *)src + 4); |
| 3105 | fparamsPtr->windowSize = 0; /* windowSize==0 means a frame is skippable */ |
| 3106 | return 0; |
| 3107 | } |
| 3108 | return ERROR(prefix_unknown); |
| 3109 | } |
| 3110 | |
| 3111 | /* ensure there is enough `srcSize` to fully read/decode frame header */ |
| 3112 | { size_t const fhsize = ZSTDv07_frameHeaderSize(src, srcSize); |
| 3113 | if (srcSize < fhsize) return fhsize; } |
| 3114 | |
| 3115 | { BYTE const fhdByte = ip[4]; |
| 3116 | size_t pos = 5; |
| 3117 | U32 const dictIDSizeCode = fhdByte&3; |
| 3118 | U32 const checksumFlag = (fhdByte>>2)&1; |
| 3119 | U32 const directMode = (fhdByte>>5)&1; |
| 3120 | U32 const fcsID = fhdByte>>6; |
| 3121 | U32 const windowSizeMax = 1U << ZSTDv07_WINDOWLOG_MAX; |
| 3122 | U32 windowSize = 0; |
| 3123 | U32 dictID = 0; |
| 3124 | U64 frameContentSize = 0; |
| 3125 | if ((fhdByte & 0x08) != 0) /* reserved bits, which must be zero */ |
| 3126 | return ERROR(frameParameter_unsupported); |
| 3127 | if (!directMode) { |
| 3128 | BYTE const wlByte = ip[pos++]; |
| 3129 | U32 const windowLog = (wlByte >> 3) + ZSTDv07_WINDOWLOG_ABSOLUTEMIN; |
| 3130 | if (windowLog > ZSTDv07_WINDOWLOG_MAX) |
| 3131 | return ERROR(frameParameter_unsupported); |
| 3132 | windowSize = (1U << windowLog); |
| 3133 | windowSize += (windowSize >> 3) * (wlByte&7); |
| 3134 | } |
| 3135 | |
| 3136 | switch(dictIDSizeCode) |
| 3137 | { |
| 3138 | default: /* impossible */ |
| 3139 | case 0 : break; |
| 3140 | case 1 : dictID = ip[pos]; pos++; break; |
| 3141 | case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break; |
| 3142 | case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break; |
| 3143 | } |
| 3144 | switch(fcsID) |
| 3145 | { |
| 3146 | default: /* impossible */ |
| 3147 | case 0 : if (directMode) frameContentSize = ip[pos]; break; |
| 3148 | case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break; |
| 3149 | case 2 : frameContentSize = MEM_readLE32(ip+pos); break; |
| 3150 | case 3 : frameContentSize = MEM_readLE64(ip+pos); break; |
| 3151 | } |
| 3152 | if (!windowSize) windowSize = (U32)frameContentSize; |
| 3153 | if (windowSize > windowSizeMax) |
| 3154 | return ERROR(frameParameter_unsupported); |
| 3155 | fparamsPtr->frameContentSize = frameContentSize; |
| 3156 | fparamsPtr->windowSize = windowSize; |
| 3157 | fparamsPtr->dictID = dictID; |
| 3158 | fparamsPtr->checksumFlag = checksumFlag; |
| 3159 | } |
| 3160 | return 0; |
| 3161 | } |
| 3162 | |
| 3163 | |
| 3164 | /** ZSTDv07_getDecompressedSize() : |
| 3165 | * compatible with legacy mode |
| 3166 | * @return : decompressed size if known, 0 otherwise |
| 3167 | note : 0 can mean any of the following : |
| 3168 | - decompressed size is not provided within frame header |
| 3169 | - frame header unknown / not supported |
| 3170 | - frame header not completely provided (`srcSize` too small) */ |
| 3171 | unsigned long long ZSTDv07_getDecompressedSize(const void* src, size_t srcSize) |
| 3172 | { |
| 3173 | ZSTDv07_frameParams fparams; |
| 3174 | size_t const frResult = ZSTDv07_getFrameParams(&fparams, src, srcSize); |
| 3175 | if (frResult!=0) return 0; |
| 3176 | return fparams.frameContentSize; |
| 3177 | } |
| 3178 | |
| 3179 | |
| 3180 | /** ZSTDv07_decodeFrameHeader() : |
| 3181 | * `srcSize` must be the size provided by ZSTDv07_frameHeaderSize(). |
| 3182 | * @return : 0 if success, or an error code, which can be tested using ZSTDv07_isError() */ |
| 3183 | static size_t ZSTDv07_decodeFrameHeader(ZSTDv07_DCtx* dctx, const void* src, size_t srcSize) |
| 3184 | { |
| 3185 | size_t const result = ZSTDv07_getFrameParams(&(dctx->fParams), src, srcSize); |
| 3186 | if (dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID)) return ERROR(dictionary_wrong); |
| 3187 | if (dctx->fParams.checksumFlag) XXH64_reset(&dctx->xxhState, 0); |
| 3188 | return result; |
| 3189 | } |
| 3190 | |
| 3191 | |
| 3192 | typedef struct |
| 3193 | { |
| 3194 | blockType_t blockType; |
| 3195 | U32 origSize; |
| 3196 | } blockProperties_t; |
| 3197 | |
| 3198 | /*! ZSTDv07_getcBlockSize() : |
| 3199 | * Provides the size of compressed block from block header `src` */ |
| 3200 | static size_t ZSTDv07_getcBlockSize(const void* src, size_t srcSize, blockProperties_t* bpPtr) |
| 3201 | { |
| 3202 | const BYTE* const in = (const BYTE*)src; |
| 3203 | U32 cSize; |
| 3204 | |
| 3205 | if (srcSize < ZSTDv07_blockHeaderSize) return ERROR(srcSize_wrong); |
| 3206 | |
| 3207 | bpPtr->blockType = (blockType_t)((*in) >> 6); |
| 3208 | cSize = in[2] + (in[1]<<8) + ((in[0] & 7)<<16); |
| 3209 | bpPtr->origSize = (bpPtr->blockType == bt_rle) ? cSize : 0; |
| 3210 | |
| 3211 | if (bpPtr->blockType == bt_end) return 0; |
| 3212 | if (bpPtr->blockType == bt_rle) return 1; |
| 3213 | return cSize; |
| 3214 | } |
| 3215 | |
| 3216 | |
| 3217 | static size_t ZSTDv07_copyRawBlock(void* dst, size_t dstCapacity, const void* src, size_t srcSize) |
| 3218 | { |
| 3219 | if (srcSize > dstCapacity) return ERROR(dstSize_tooSmall); |
| 3220 | if (srcSize > 0) { |
| 3221 | memcpy(dst, src, srcSize); |
| 3222 | } |
| 3223 | return srcSize; |
| 3224 | } |
| 3225 | |
| 3226 | |
| 3227 | /*! ZSTDv07_decodeLiteralsBlock() : |
| 3228 | @return : nb of bytes read from src (< srcSize ) */ |
| 3229 | static size_t ZSTDv07_decodeLiteralsBlock(ZSTDv07_DCtx* dctx, |
| 3230 | const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */ |
| 3231 | { |
| 3232 | const BYTE* const istart = (const BYTE*) src; |
| 3233 | |
| 3234 | if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected); |
| 3235 | |
| 3236 | switch((litBlockType_t)(istart[0]>> 6)) |
| 3237 | { |
| 3238 | case lbt_huffman: |
| 3239 | { size_t litSize, litCSize, singleStream=0; |
| 3240 | U32 lhSize = (istart[0] >> 4) & 3; |
| 3241 | if (srcSize < 5) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for lhSize, + cSize (+nbSeq) */ |
| 3242 | switch(lhSize) |
| 3243 | { |
| 3244 | case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ |
| 3245 | /* 2 - 2 - 10 - 10 */ |
| 3246 | lhSize=3; |
| 3247 | singleStream = istart[0] & 16; |
| 3248 | litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); |
| 3249 | litCSize = ((istart[1] & 3) << 8) + istart[2]; |
| 3250 | break; |
| 3251 | case 2: |
| 3252 | /* 2 - 2 - 14 - 14 */ |
| 3253 | lhSize=4; |
| 3254 | litSize = ((istart[0] & 15) << 10) + (istart[1] << 2) + (istart[2] >> 6); |
| 3255 | litCSize = ((istart[2] & 63) << 8) + istart[3]; |
| 3256 | break; |
| 3257 | case 3: |
| 3258 | /* 2 - 2 - 18 - 18 */ |
| 3259 | lhSize=5; |
| 3260 | litSize = ((istart[0] & 15) << 14) + (istart[1] << 6) + (istart[2] >> 2); |
| 3261 | litCSize = ((istart[2] & 3) << 16) + (istart[3] << 8) + istart[4]; |
| 3262 | break; |
| 3263 | } |
| 3264 | if (litSize > ZSTDv07_BLOCKSIZE_ABSOLUTEMAX) return ERROR(corruption_detected); |
| 3265 | if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); |
| 3266 | |
| 3267 | if (HUFv07_isError(singleStream ? |
| 3268 | HUFv07_decompress1X2_DCtx(dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) : |
| 3269 | HUFv07_decompress4X_hufOnly (dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) )) |
| 3270 | return ERROR(corruption_detected); |
| 3271 | |
| 3272 | dctx->litPtr = dctx->litBuffer; |
| 3273 | dctx->litSize = litSize; |
| 3274 | dctx->litEntropy = 1; |
| 3275 | memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); |
| 3276 | return litCSize + lhSize; |
| 3277 | } |
| 3278 | case lbt_repeat: |
| 3279 | { size_t litSize, litCSize; |
| 3280 | U32 lhSize = ((istart[0]) >> 4) & 3; |
| 3281 | if (lhSize != 1) /* only case supported for now : small litSize, single stream */ |
| 3282 | return ERROR(corruption_detected); |
| 3283 | if (dctx->litEntropy==0) |
| 3284 | return ERROR(dictionary_corrupted); |
| 3285 | |
| 3286 | /* 2 - 2 - 10 - 10 */ |
| 3287 | lhSize=3; |
| 3288 | litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); |
| 3289 | litCSize = ((istart[1] & 3) << 8) + istart[2]; |
| 3290 | if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); |
| 3291 | |
| 3292 | { size_t const errorCode = HUFv07_decompress1X4_usingDTable(dctx->litBuffer, litSize, istart+lhSize, litCSize, dctx->hufTable); |
| 3293 | if (HUFv07_isError(errorCode)) return ERROR(corruption_detected); |
| 3294 | } |
| 3295 | dctx->litPtr = dctx->litBuffer; |
| 3296 | dctx->litSize = litSize; |
| 3297 | memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); |
| 3298 | return litCSize + lhSize; |
| 3299 | } |
| 3300 | case lbt_raw: |
| 3301 | { size_t litSize; |
| 3302 | U32 lhSize = ((istart[0]) >> 4) & 3; |
| 3303 | switch(lhSize) |
| 3304 | { |
| 3305 | case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ |
| 3306 | lhSize=1; |
| 3307 | litSize = istart[0] & 31; |
| 3308 | break; |
| 3309 | case 2: |
| 3310 | litSize = ((istart[0] & 15) << 8) + istart[1]; |
| 3311 | break; |
| 3312 | case 3: |
| 3313 | litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; |
| 3314 | break; |
| 3315 | } |
| 3316 | |
| 3317 | if (lhSize+litSize+WILDCOPY_OVERLENGTH > srcSize) { /* risk reading beyond src buffer with wildcopy */ |
| 3318 | if (litSize+lhSize > srcSize) return ERROR(corruption_detected); |
| 3319 | memcpy(dctx->litBuffer, istart+lhSize, litSize); |
| 3320 | dctx->litPtr = dctx->litBuffer; |
| 3321 | dctx->litSize = litSize; |
| 3322 | memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); |
| 3323 | return lhSize+litSize; |
| 3324 | } |
| 3325 | /* direct reference into compressed stream */ |
| 3326 | dctx->litPtr = istart+lhSize; |
| 3327 | dctx->litSize = litSize; |
| 3328 | return lhSize+litSize; |
| 3329 | } |
| 3330 | case lbt_rle: |
| 3331 | { size_t litSize; |
| 3332 | U32 lhSize = ((istart[0]) >> 4) & 3; |
| 3333 | switch(lhSize) |
| 3334 | { |
| 3335 | case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ |
| 3336 | lhSize = 1; |
| 3337 | litSize = istart[0] & 31; |
| 3338 | break; |
| 3339 | case 2: |
| 3340 | litSize = ((istart[0] & 15) << 8) + istart[1]; |
| 3341 | break; |
| 3342 | case 3: |
| 3343 | litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; |
| 3344 | if (srcSize<4) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4 */ |
| 3345 | break; |
| 3346 | } |
| 3347 | if (litSize > ZSTDv07_BLOCKSIZE_ABSOLUTEMAX) return ERROR(corruption_detected); |
| 3348 | memset(dctx->litBuffer, istart[lhSize], litSize + WILDCOPY_OVERLENGTH); |
| 3349 | dctx->litPtr = dctx->litBuffer; |
| 3350 | dctx->litSize = litSize; |
| 3351 | return lhSize+1; |
| 3352 | } |
| 3353 | default: |
| 3354 | return ERROR(corruption_detected); /* impossible */ |
| 3355 | } |
| 3356 | } |
| 3357 | |
| 3358 | |
| 3359 | /*! ZSTDv07_buildSeqTable() : |
| 3360 | @return : nb bytes read from src, |
| 3361 | or an error code if it fails, testable with ZSTDv07_isError() |
| 3362 | */ |
| 3363 | static size_t ZSTDv07_buildSeqTable(FSEv07_DTable* DTable, U32 type, U32 max, U32 maxLog, |
| 3364 | const void* src, size_t srcSize, |
| 3365 | const S16* defaultNorm, U32 defaultLog, U32 flagRepeatTable) |
| 3366 | { |
| 3367 | switch(type) |
| 3368 | { |
| 3369 | case FSEv07_ENCODING_RLE : |
| 3370 | if (!srcSize) return ERROR(srcSize_wrong); |
| 3371 | if ( (*(const BYTE*)src) > max) return ERROR(corruption_detected); |
| 3372 | FSEv07_buildDTable_rle(DTable, *(const BYTE*)src); /* if *src > max, data is corrupted */ |
| 3373 | return 1; |
| 3374 | case FSEv07_ENCODING_RAW : |
| 3375 | FSEv07_buildDTable(DTable, defaultNorm, max, defaultLog); |
| 3376 | return 0; |
| 3377 | case FSEv07_ENCODING_STATIC: |
| 3378 | if (!flagRepeatTable) return ERROR(corruption_detected); |
| 3379 | return 0; |
| 3380 | default : /* impossible */ |
| 3381 | case FSEv07_ENCODING_DYNAMIC : |
| 3382 | { U32 tableLog; |
| 3383 | S16 norm[MaxSeq+1]; |
| 3384 | size_t const headerSize = FSEv07_readNCount(norm, &max, &tableLog, src, srcSize); |
| 3385 | if (FSEv07_isError(headerSize)) return ERROR(corruption_detected); |
| 3386 | if (tableLog > maxLog) return ERROR(corruption_detected); |
| 3387 | FSEv07_buildDTable(DTable, norm, max, tableLog); |
| 3388 | return headerSize; |
| 3389 | } } |
| 3390 | } |
| 3391 | |
| 3392 | |
| 3393 | static size_t ZSTDv07_decodeSeqHeaders(int* nbSeqPtr, |
| 3394 | FSEv07_DTable* DTableLL, FSEv07_DTable* DTableML, FSEv07_DTable* DTableOffb, U32 flagRepeatTable, |
| 3395 | const void* src, size_t srcSize) |
| 3396 | { |
| 3397 | const BYTE* const istart = (const BYTE*)src; |
| 3398 | const BYTE* const iend = istart + srcSize; |
| 3399 | const BYTE* ip = istart; |
| 3400 | |
| 3401 | /* check */ |
| 3402 | if (srcSize < MIN_SEQUENCES_SIZE) return ERROR(srcSize_wrong); |
| 3403 | |
| 3404 | /* SeqHead */ |
| 3405 | { int nbSeq = *ip++; |
| 3406 | if (!nbSeq) { *nbSeqPtr=0; return 1; } |
| 3407 | if (nbSeq > 0x7F) { |
| 3408 | if (nbSeq == 0xFF) { |
| 3409 | if (ip+2 > iend) return ERROR(srcSize_wrong); |
| 3410 | nbSeq = MEM_readLE16(ip) + LONGNBSEQ, ip+=2; |
| 3411 | } else { |
| 3412 | if (ip >= iend) return ERROR(srcSize_wrong); |
| 3413 | nbSeq = ((nbSeq-0x80)<<8) + *ip++; |
| 3414 | } |
| 3415 | } |
| 3416 | *nbSeqPtr = nbSeq; |
| 3417 | } |
| 3418 | |
| 3419 | /* FSE table descriptors */ |
| 3420 | if (ip + 4 > iend) return ERROR(srcSize_wrong); /* min : header byte + all 3 are "raw", hence no header, but at least xxLog bits per type */ |
| 3421 | { U32 const LLtype = *ip >> 6; |
| 3422 | U32 const OFtype = (*ip >> 4) & 3; |
| 3423 | U32 const MLtype = (*ip >> 2) & 3; |
| 3424 | ip++; |
| 3425 | |
| 3426 | /* Build DTables */ |
| 3427 | { size_t const llhSize = ZSTDv07_buildSeqTable(DTableLL, LLtype, MaxLL, LLFSELog, ip, iend-ip, LL_defaultNorm, LL_defaultNormLog, flagRepeatTable); |
| 3428 | if (ZSTDv07_isError(llhSize)) return ERROR(corruption_detected); |
| 3429 | ip += llhSize; |
| 3430 | } |
| 3431 | { size_t const ofhSize = ZSTDv07_buildSeqTable(DTableOffb, OFtype, MaxOff, OffFSELog, ip, iend-ip, OF_defaultNorm, OF_defaultNormLog, flagRepeatTable); |
| 3432 | if (ZSTDv07_isError(ofhSize)) return ERROR(corruption_detected); |
| 3433 | ip += ofhSize; |
| 3434 | } |
| 3435 | { size_t const mlhSize = ZSTDv07_buildSeqTable(DTableML, MLtype, MaxML, MLFSELog, ip, iend-ip, ML_defaultNorm, ML_defaultNormLog, flagRepeatTable); |
| 3436 | if (ZSTDv07_isError(mlhSize)) return ERROR(corruption_detected); |
| 3437 | ip += mlhSize; |
| 3438 | } } |
| 3439 | |
| 3440 | return ip-istart; |
| 3441 | } |
| 3442 | |
| 3443 | |
| 3444 | typedef struct { |
| 3445 | size_t litLength; |
| 3446 | size_t matchLength; |
| 3447 | size_t offset; |
| 3448 | } seq_t; |
| 3449 | |
| 3450 | typedef struct { |
| 3451 | BITv07_DStream_t DStream; |
| 3452 | FSEv07_DState_t stateLL; |
| 3453 | FSEv07_DState_t stateOffb; |
| 3454 | FSEv07_DState_t stateML; |
| 3455 | size_t prevOffset[ZSTDv07_REP_INIT]; |
| 3456 | } seqState_t; |
| 3457 | |
| 3458 | |
| 3459 | static seq_t ZSTDv07_decodeSequence(seqState_t* seqState) |
| 3460 | { |
| 3461 | seq_t seq; |
| 3462 | |
| 3463 | U32 const llCode = FSEv07_peekSymbol(&(seqState->stateLL)); |
| 3464 | U32 const mlCode = FSEv07_peekSymbol(&(seqState->stateML)); |
| 3465 | U32 const ofCode = FSEv07_peekSymbol(&(seqState->stateOffb)); /* <= maxOff, by table construction */ |
| 3466 | |
| 3467 | U32 const llBits = LL_bits[llCode]; |
| 3468 | U32 const mlBits = ML_bits[mlCode]; |
| 3469 | U32 const ofBits = ofCode; |
| 3470 | U32 const totalBits = llBits+mlBits+ofBits; |
| 3471 | |
| 3472 | static const U32 LL_base[MaxLL+1] = { |
| 3473 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, |
| 3474 | 16, 18, 20, 22, 24, 28, 32, 40, 48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, |
| 3475 | 0x2000, 0x4000, 0x8000, 0x10000 }; |
| 3476 | |
| 3477 | static const U32 ML_base[MaxML+1] = { |
| 3478 | 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, |
| 3479 | 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, |
| 3480 | 35, 37, 39, 41, 43, 47, 51, 59, 67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803, |
| 3481 | 0x1003, 0x2003, 0x4003, 0x8003, 0x10003 }; |
| 3482 | |
| 3483 | static const U32 OF_base[MaxOff+1] = { |
| 3484 | 0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D, |
| 3485 | 0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD, |
| 3486 | 0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD, |
| 3487 | 0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD }; |
| 3488 | |
| 3489 | /* sequence */ |
| 3490 | { size_t offset; |
| 3491 | if (!ofCode) |
| 3492 | offset = 0; |
| 3493 | else { |
| 3494 | offset = OF_base[ofCode] + BITv07_readBits(&(seqState->DStream), ofBits); /* <= (ZSTDv07_WINDOWLOG_MAX-1) bits */ |
| 3495 | if (MEM_32bits()) BITv07_reloadDStream(&(seqState->DStream)); |
| 3496 | } |
| 3497 | |
| 3498 | if (ofCode <= 1) { |
| 3499 | if ((llCode == 0) & (offset <= 1)) offset = 1-offset; |
| 3500 | if (offset) { |
| 3501 | size_t const temp = seqState->prevOffset[offset]; |
| 3502 | if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1]; |
| 3503 | seqState->prevOffset[1] = seqState->prevOffset[0]; |
| 3504 | seqState->prevOffset[0] = offset = temp; |
| 3505 | } else { |
| 3506 | offset = seqState->prevOffset[0]; |
| 3507 | } |
| 3508 | } else { |
| 3509 | seqState->prevOffset[2] = seqState->prevOffset[1]; |
| 3510 | seqState->prevOffset[1] = seqState->prevOffset[0]; |
| 3511 | seqState->prevOffset[0] = offset; |
| 3512 | } |
| 3513 | seq.offset = offset; |
| 3514 | } |
| 3515 | |
| 3516 | seq.matchLength = ML_base[mlCode] + ((mlCode>31) ? BITv07_readBits(&(seqState->DStream), mlBits) : 0); /* <= 16 bits */ |
| 3517 | if (MEM_32bits() && (mlBits+llBits>24)) BITv07_reloadDStream(&(seqState->DStream)); |
| 3518 | |
| 3519 | seq.litLength = LL_base[llCode] + ((llCode>15) ? BITv07_readBits(&(seqState->DStream), llBits) : 0); /* <= 16 bits */ |
| 3520 | if (MEM_32bits() || |
| 3521 | (totalBits > 64 - 7 - (LLFSELog+MLFSELog+OffFSELog)) ) BITv07_reloadDStream(&(seqState->DStream)); |
| 3522 | |
| 3523 | /* ANS state update */ |
| 3524 | FSEv07_updateState(&(seqState->stateLL), &(seqState->DStream)); /* <= 9 bits */ |
| 3525 | FSEv07_updateState(&(seqState->stateML), &(seqState->DStream)); /* <= 9 bits */ |
| 3526 | if (MEM_32bits()) BITv07_reloadDStream(&(seqState->DStream)); /* <= 18 bits */ |
| 3527 | FSEv07_updateState(&(seqState->stateOffb), &(seqState->DStream)); /* <= 8 bits */ |
| 3528 | |
| 3529 | return seq; |
| 3530 | } |
| 3531 | |
| 3532 | |
| 3533 | static |
| 3534 | size_t ZSTDv07_execSequence(BYTE* op, |
| 3535 | BYTE* const oend, seq_t sequence, |
| 3536 | const BYTE** litPtr, const BYTE* const litLimit, |
| 3537 | const BYTE* const base, const BYTE* const vBase, const BYTE* const dictEnd) |
| 3538 | { |
| 3539 | BYTE* const oLitEnd = op + sequence.litLength; |
| 3540 | size_t const sequenceLength = sequence.litLength + sequence.matchLength; |
| 3541 | BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */ |
| 3542 | BYTE* const oend_w = oend-WILDCOPY_OVERLENGTH; |
| 3543 | const BYTE* const iLitEnd = *litPtr + sequence.litLength; |
| 3544 | const BYTE* match = oLitEnd - sequence.offset; |
| 3545 | |
| 3546 | /* check */ |
| 3547 | assert(oend >= op); |
| 3548 | if (sequence.litLength + WILDCOPY_OVERLENGTH > (size_t)(oend - op)) return ERROR(dstSize_tooSmall); |
| 3549 | if (sequenceLength > (size_t)(oend - op)) return ERROR(dstSize_tooSmall); |
| 3550 | assert(litLimit >= *litPtr); |
| 3551 | if (sequence.litLength > (size_t)(litLimit - *litPtr)) return ERROR(corruption_detected);; |
| 3552 | |
| 3553 | /* copy Literals */ |
| 3554 | ZSTDv07_wildcopy(op, *litPtr, (ptrdiff_t)sequence.litLength); /* note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */ |
| 3555 | op = oLitEnd; |
| 3556 | *litPtr = iLitEnd; /* update for next sequence */ |
| 3557 | |
| 3558 | /* copy Match */ |
| 3559 | if (sequence.offset > (size_t)(oLitEnd - base)) { |
| 3560 | /* offset beyond prefix */ |
| 3561 | if (sequence.offset > (size_t)(oLitEnd - vBase)) return ERROR(corruption_detected); |
| 3562 | match = dictEnd - (base-match); |
| 3563 | if (match + sequence.matchLength <= dictEnd) { |
| 3564 | memmove(oLitEnd, match, sequence.matchLength); |
| 3565 | return sequenceLength; |
| 3566 | } |
| 3567 | /* span extDict & currentPrefixSegment */ |
| 3568 | { size_t const length1 = (size_t)(dictEnd - match); |
| 3569 | memmove(oLitEnd, match, length1); |
| 3570 | op = oLitEnd + length1; |
| 3571 | sequence.matchLength -= length1; |
| 3572 | match = base; |
| 3573 | if (op > oend_w || sequence.matchLength < MINMATCH) { |
| 3574 | while (op < oMatchEnd) *op++ = *match++; |
| 3575 | return sequenceLength; |
| 3576 | } |
| 3577 | } } |
| 3578 | /* Requirement: op <= oend_w */ |
| 3579 | |
| 3580 | /* match within prefix */ |
| 3581 | if (sequence.offset < 8) { |
| 3582 | /* close range match, overlap */ |
| 3583 | static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */ |
| 3584 | static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */ |
| 3585 | int const sub2 = dec64table[sequence.offset]; |
| 3586 | op[0] = match[0]; |
| 3587 | op[1] = match[1]; |
| 3588 | op[2] = match[2]; |
| 3589 | op[3] = match[3]; |
| 3590 | match += dec32table[sequence.offset]; |
| 3591 | ZSTDv07_copy4(op+4, match); |
| 3592 | match -= sub2; |
| 3593 | } else { |
| 3594 | ZSTDv07_copy8(op, match); |
| 3595 | } |
| 3596 | op += 8; match += 8; |
| 3597 | |
| 3598 | if (oMatchEnd > oend-(16-MINMATCH)) { |
| 3599 | if (op < oend_w) { |
| 3600 | ZSTDv07_wildcopy(op, match, oend_w - op); |
| 3601 | match += oend_w - op; |
| 3602 | op = oend_w; |
| 3603 | } |
| 3604 | while (op < oMatchEnd) *op++ = *match++; |
| 3605 | } else { |
| 3606 | ZSTDv07_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */ |
| 3607 | } |
| 3608 | return sequenceLength; |
| 3609 | } |
| 3610 | |
| 3611 | |
| 3612 | static size_t ZSTDv07_decompressSequences( |
| 3613 | ZSTDv07_DCtx* dctx, |
| 3614 | void* dst, size_t maxDstSize, |
| 3615 | const void* seqStart, size_t seqSize) |
| 3616 | { |
| 3617 | const BYTE* ip = (const BYTE*)seqStart; |
| 3618 | const BYTE* const iend = ip + seqSize; |
| 3619 | BYTE* const ostart = (BYTE*)dst; |
| 3620 | BYTE* const oend = ostart + maxDstSize; |
| 3621 | BYTE* op = ostart; |
| 3622 | const BYTE* litPtr = dctx->litPtr; |
| 3623 | const BYTE* const litEnd = litPtr + dctx->litSize; |
| 3624 | FSEv07_DTable* DTableLL = dctx->LLTable; |
| 3625 | FSEv07_DTable* DTableML = dctx->MLTable; |
| 3626 | FSEv07_DTable* DTableOffb = dctx->OffTable; |
| 3627 | const BYTE* const base = (const BYTE*) (dctx->base); |
| 3628 | const BYTE* const vBase = (const BYTE*) (dctx->vBase); |
| 3629 | const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd); |
| 3630 | int nbSeq; |
| 3631 | |
| 3632 | /* Build Decoding Tables */ |
| 3633 | { size_t const seqHSize = ZSTDv07_decodeSeqHeaders(&nbSeq, DTableLL, DTableML, DTableOffb, dctx->fseEntropy, ip, seqSize); |
| 3634 | if (ZSTDv07_isError(seqHSize)) return seqHSize; |
| 3635 | ip += seqHSize; |
| 3636 | } |
| 3637 | |
| 3638 | /* Regen sequences */ |
| 3639 | if (nbSeq) { |
| 3640 | seqState_t seqState; |
| 3641 | dctx->fseEntropy = 1; |
| 3642 | { U32 i; for (i=0; i<ZSTDv07_REP_INIT; i++) seqState.prevOffset[i] = dctx->rep[i]; } |
| 3643 | { size_t const errorCode = BITv07_initDStream(&(seqState.DStream), ip, iend-ip); |
| 3644 | if (ERR_isError(errorCode)) return ERROR(corruption_detected); } |
| 3645 | FSEv07_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL); |
| 3646 | FSEv07_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb); |
| 3647 | FSEv07_initDState(&(seqState.stateML), &(seqState.DStream), DTableML); |
| 3648 | |
| 3649 | for ( ; (BITv07_reloadDStream(&(seqState.DStream)) <= BITv07_DStream_completed) && nbSeq ; ) { |
| 3650 | nbSeq--; |
| 3651 | { seq_t const sequence = ZSTDv07_decodeSequence(&seqState); |
| 3652 | size_t const oneSeqSize = ZSTDv07_execSequence(op, oend, sequence, &litPtr, litEnd, base, vBase, dictEnd); |
| 3653 | if (ZSTDv07_isError(oneSeqSize)) return oneSeqSize; |
| 3654 | op += oneSeqSize; |
| 3655 | } } |
| 3656 | |
| 3657 | /* check if reached exact end */ |
| 3658 | if (nbSeq) return ERROR(corruption_detected); |
| 3659 | /* save reps for next block */ |
| 3660 | { U32 i; for (i=0; i<ZSTDv07_REP_INIT; i++) dctx->rep[i] = (U32)(seqState.prevOffset[i]); } |
| 3661 | } |
| 3662 | |
| 3663 | /* last literal segment */ |
| 3664 | { size_t const lastLLSize = litEnd - litPtr; |
| 3665 | /* if (litPtr > litEnd) return ERROR(corruption_detected); */ /* too many literals already used */ |
| 3666 | if (lastLLSize > (size_t)(oend-op)) return ERROR(dstSize_tooSmall); |
| 3667 | if (lastLLSize > 0) { |
| 3668 | memcpy(op, litPtr, lastLLSize); |
| 3669 | op += lastLLSize; |
| 3670 | } |
| 3671 | } |
| 3672 | |
| 3673 | return op-ostart; |
| 3674 | } |
| 3675 | |
| 3676 | |
| 3677 | static void ZSTDv07_checkContinuity(ZSTDv07_DCtx* dctx, const void* dst) |
| 3678 | { |
| 3679 | if (dst != dctx->previousDstEnd) { /* not contiguous */ |
| 3680 | dctx->dictEnd = dctx->previousDstEnd; |
| 3681 | dctx->vBase = (const char*)dst - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); |
| 3682 | dctx->base = dst; |
| 3683 | dctx->previousDstEnd = dst; |
| 3684 | } |
| 3685 | } |
| 3686 | |
| 3687 | |
| 3688 | static size_t ZSTDv07_decompressBlock_internal(ZSTDv07_DCtx* dctx, |
| 3689 | void* dst, size_t dstCapacity, |
| 3690 | const void* src, size_t srcSize) |
| 3691 | { /* blockType == blockCompressed */ |
| 3692 | const BYTE* ip = (const BYTE*)src; |
| 3693 | |
| 3694 | if (srcSize >= ZSTDv07_BLOCKSIZE_ABSOLUTEMAX) return ERROR(srcSize_wrong); |
| 3695 | |
| 3696 | /* Decode literals sub-block */ |
| 3697 | { size_t const litCSize = ZSTDv07_decodeLiteralsBlock(dctx, src, srcSize); |
| 3698 | if (ZSTDv07_isError(litCSize)) return litCSize; |
| 3699 | ip += litCSize; |
| 3700 | srcSize -= litCSize; |
| 3701 | } |
| 3702 | return ZSTDv07_decompressSequences(dctx, dst, dstCapacity, ip, srcSize); |
| 3703 | } |
| 3704 | |
| 3705 | |
| 3706 | size_t ZSTDv07_decompressBlock(ZSTDv07_DCtx* dctx, |
| 3707 | void* dst, size_t dstCapacity, |
| 3708 | const void* src, size_t srcSize) |
| 3709 | { |
| 3710 | size_t dSize; |
| 3711 | ZSTDv07_checkContinuity(dctx, dst); |
| 3712 | dSize = ZSTDv07_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize); |
| 3713 | dctx->previousDstEnd = (char*)dst + dSize; |
| 3714 | return dSize; |
| 3715 | } |
| 3716 | |
| 3717 | |
| 3718 | /** ZSTDv07_insertBlock() : |
| 3719 | insert `src` block into `dctx` history. Useful to track uncompressed blocks. */ |
| 3720 | ZSTDLIBv07_API size_t ZSTDv07_insertBlock(ZSTDv07_DCtx* dctx, const void* blockStart, size_t blockSize) |
| 3721 | { |
| 3722 | ZSTDv07_checkContinuity(dctx, blockStart); |
| 3723 | dctx->previousDstEnd = (const char*)blockStart + blockSize; |
| 3724 | return blockSize; |
| 3725 | } |
| 3726 | |
| 3727 | |
| 3728 | static size_t ZSTDv07_generateNxBytes(void* dst, size_t dstCapacity, BYTE byte, size_t length) |
| 3729 | { |
| 3730 | if (length > dstCapacity) return ERROR(dstSize_tooSmall); |
| 3731 | if (length > 0) { |
| 3732 | memset(dst, byte, length); |
| 3733 | } |
| 3734 | return length; |
| 3735 | } |
| 3736 | |
| 3737 | |
| 3738 | /*! ZSTDv07_decompressFrame() : |
| 3739 | * `dctx` must be properly initialized */ |
| 3740 | static size_t ZSTDv07_decompressFrame(ZSTDv07_DCtx* dctx, |
| 3741 | void* dst, size_t dstCapacity, |
| 3742 | const void* src, size_t srcSize) |
| 3743 | { |
| 3744 | const BYTE* ip = (const BYTE*)src; |
| 3745 | const BYTE* const iend = ip + srcSize; |
| 3746 | BYTE* const ostart = (BYTE*)dst; |
| 3747 | BYTE* const oend = ostart + dstCapacity; |
| 3748 | BYTE* op = ostart; |
| 3749 | size_t remainingSize = srcSize; |
| 3750 | |
| 3751 | /* check */ |
| 3752 | if (srcSize < ZSTDv07_frameHeaderSize_min+ZSTDv07_blockHeaderSize) return ERROR(srcSize_wrong); |
| 3753 | |
| 3754 | /* Frame Header */ |
| 3755 | { size_t const frameHeaderSize = ZSTDv07_frameHeaderSize(src, ZSTDv07_frameHeaderSize_min); |
| 3756 | if (ZSTDv07_isError(frameHeaderSize)) return frameHeaderSize; |
| 3757 | if (srcSize < frameHeaderSize+ZSTDv07_blockHeaderSize) return ERROR(srcSize_wrong); |
| 3758 | if (ZSTDv07_decodeFrameHeader(dctx, src, frameHeaderSize)) return ERROR(corruption_detected); |
| 3759 | ip += frameHeaderSize; remainingSize -= frameHeaderSize; |
| 3760 | } |
| 3761 | |
| 3762 | /* Loop on each block */ |
| 3763 | while (1) { |
| 3764 | size_t decodedSize; |
| 3765 | blockProperties_t blockProperties; |
| 3766 | size_t const cBlockSize = ZSTDv07_getcBlockSize(ip, iend-ip, &blockProperties); |
| 3767 | if (ZSTDv07_isError(cBlockSize)) return cBlockSize; |
| 3768 | |
| 3769 | ip += ZSTDv07_blockHeaderSize; |
| 3770 | remainingSize -= ZSTDv07_blockHeaderSize; |
| 3771 | if (cBlockSize > remainingSize) return ERROR(srcSize_wrong); |
| 3772 | |
| 3773 | switch(blockProperties.blockType) |
| 3774 | { |
| 3775 | case bt_compressed: |
| 3776 | decodedSize = ZSTDv07_decompressBlock_internal(dctx, op, oend-op, ip, cBlockSize); |
| 3777 | break; |
| 3778 | case bt_raw : |
| 3779 | decodedSize = ZSTDv07_copyRawBlock(op, oend-op, ip, cBlockSize); |
| 3780 | break; |
| 3781 | case bt_rle : |
| 3782 | decodedSize = ZSTDv07_generateNxBytes(op, oend-op, *ip, blockProperties.origSize); |
| 3783 | break; |
| 3784 | case bt_end : |
| 3785 | /* end of frame */ |
| 3786 | if (remainingSize) return ERROR(srcSize_wrong); |
| 3787 | decodedSize = 0; |
| 3788 | break; |
| 3789 | default: |
| 3790 | return ERROR(GENERIC); /* impossible */ |
| 3791 | } |
| 3792 | if (blockProperties.blockType == bt_end) break; /* bt_end */ |
| 3793 | |
| 3794 | if (ZSTDv07_isError(decodedSize)) return decodedSize; |
| 3795 | if (dctx->fParams.checksumFlag) XXH64_update(&dctx->xxhState, op, decodedSize); |
| 3796 | op += decodedSize; |
| 3797 | ip += cBlockSize; |
| 3798 | remainingSize -= cBlockSize; |
| 3799 | } |
| 3800 | |
| 3801 | return op-ostart; |
| 3802 | } |
| 3803 | |
| 3804 | |
| 3805 | /*! ZSTDv07_decompress_usingPreparedDCtx() : |
| 3806 | * Same as ZSTDv07_decompress_usingDict, but using a reference context `preparedDCtx`, where dictionary has been loaded. |
| 3807 | * It avoids reloading the dictionary each time. |
| 3808 | * `preparedDCtx` must have been properly initialized using ZSTDv07_decompressBegin_usingDict(). |
| 3809 | * Requires 2 contexts : 1 for reference (preparedDCtx), which will not be modified, and 1 to run the decompression operation (dctx) */ |
| 3810 | static size_t ZSTDv07_decompress_usingPreparedDCtx(ZSTDv07_DCtx* dctx, const ZSTDv07_DCtx* refDCtx, |
| 3811 | void* dst, size_t dstCapacity, |
| 3812 | const void* src, size_t srcSize) |
| 3813 | { |
| 3814 | ZSTDv07_copyDCtx(dctx, refDCtx); |
| 3815 | ZSTDv07_checkContinuity(dctx, dst); |
| 3816 | return ZSTDv07_decompressFrame(dctx, dst, dstCapacity, src, srcSize); |
| 3817 | } |
| 3818 | |
| 3819 | |
| 3820 | size_t ZSTDv07_decompress_usingDict(ZSTDv07_DCtx* dctx, |
| 3821 | void* dst, size_t dstCapacity, |
| 3822 | const void* src, size_t srcSize, |
| 3823 | const void* dict, size_t dictSize) |
| 3824 | { |
| 3825 | ZSTDv07_decompressBegin_usingDict(dctx, dict, dictSize); |
| 3826 | ZSTDv07_checkContinuity(dctx, dst); |
| 3827 | return ZSTDv07_decompressFrame(dctx, dst, dstCapacity, src, srcSize); |
| 3828 | } |
| 3829 | |
| 3830 | |
| 3831 | size_t ZSTDv07_decompressDCtx(ZSTDv07_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) |
| 3832 | { |
| 3833 | return ZSTDv07_decompress_usingDict(dctx, dst, dstCapacity, src, srcSize, NULL, 0); |
| 3834 | } |
| 3835 | |
| 3836 | |
| 3837 | size_t ZSTDv07_decompress(void* dst, size_t dstCapacity, const void* src, size_t srcSize) |
| 3838 | { |
| 3839 | #if defined(ZSTDv07_HEAPMODE) && (ZSTDv07_HEAPMODE==1) |
| 3840 | size_t regenSize; |
| 3841 | ZSTDv07_DCtx* const dctx = ZSTDv07_createDCtx(); |
| 3842 | if (dctx==NULL) return ERROR(memory_allocation); |
| 3843 | regenSize = ZSTDv07_decompressDCtx(dctx, dst, dstCapacity, src, srcSize); |
| 3844 | ZSTDv07_freeDCtx(dctx); |
| 3845 | return regenSize; |
| 3846 | #else /* stack mode */ |
| 3847 | ZSTDv07_DCtx dctx; |
| 3848 | return ZSTDv07_decompressDCtx(&dctx, dst, dstCapacity, src, srcSize); |
| 3849 | #endif |
| 3850 | } |
| 3851 | |
| 3852 | /* ZSTD_errorFrameSizeInfoLegacy() : |
| 3853 | assumes `cSize` and `dBound` are _not_ NULL */ |
| 3854 | static void ZSTD_errorFrameSizeInfoLegacy(size_t* cSize, unsigned long long* dBound, size_t ret) |
| 3855 | { |
| 3856 | *cSize = ret; |
| 3857 | *dBound = ZSTD_CONTENTSIZE_ERROR; |
| 3858 | } |
| 3859 | |
| 3860 | void ZSTDv07_findFrameSizeInfoLegacy(const void *src, size_t srcSize, size_t* cSize, unsigned long long* dBound) |
| 3861 | { |
| 3862 | const BYTE* ip = (const BYTE*)src; |
| 3863 | size_t remainingSize = srcSize; |
| 3864 | size_t nbBlocks = 0; |
| 3865 | |
| 3866 | /* check */ |
| 3867 | if (srcSize < ZSTDv07_frameHeaderSize_min+ZSTDv07_blockHeaderSize) { |
| 3868 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); |
| 3869 | return; |
| 3870 | } |
| 3871 | |
| 3872 | /* Frame Header */ |
| 3873 | { size_t const frameHeaderSize = ZSTDv07_frameHeaderSize(src, srcSize); |
| 3874 | if (ZSTDv07_isError(frameHeaderSize)) { |
| 3875 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, frameHeaderSize); |
| 3876 | return; |
| 3877 | } |
| 3878 | if (MEM_readLE32(src) != ZSTDv07_MAGICNUMBER) { |
| 3879 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(prefix_unknown)); |
| 3880 | return; |
| 3881 | } |
| 3882 | if (srcSize < frameHeaderSize+ZSTDv07_blockHeaderSize) { |
| 3883 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); |
| 3884 | return; |
| 3885 | } |
| 3886 | ip += frameHeaderSize; remainingSize -= frameHeaderSize; |
| 3887 | } |
| 3888 | |
| 3889 | /* Loop on each block */ |
| 3890 | while (1) { |
| 3891 | blockProperties_t blockProperties; |
| 3892 | size_t const cBlockSize = ZSTDv07_getcBlockSize(ip, remainingSize, &blockProperties); |
| 3893 | if (ZSTDv07_isError(cBlockSize)) { |
| 3894 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, cBlockSize); |
| 3895 | return; |
| 3896 | } |
| 3897 | |
| 3898 | ip += ZSTDv07_blockHeaderSize; |
| 3899 | remainingSize -= ZSTDv07_blockHeaderSize; |
| 3900 | |
| 3901 | if (blockProperties.blockType == bt_end) break; |
| 3902 | |
| 3903 | if (cBlockSize > remainingSize) { |
| 3904 | ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); |
| 3905 | return; |
| 3906 | } |
| 3907 | |
| 3908 | ip += cBlockSize; |
| 3909 | remainingSize -= cBlockSize; |
| 3910 | nbBlocks++; |
| 3911 | } |
| 3912 | |
| 3913 | *cSize = ip - (const BYTE*)src; |
| 3914 | *dBound = nbBlocks * ZSTDv07_BLOCKSIZE_ABSOLUTEMAX; |
| 3915 | } |
| 3916 | |
| 3917 | /*_****************************** |
| 3918 | * Streaming Decompression API |
| 3919 | ********************************/ |
| 3920 | size_t ZSTDv07_nextSrcSizeToDecompress(ZSTDv07_DCtx* dctx) |
| 3921 | { |
| 3922 | return dctx->expected; |
| 3923 | } |
| 3924 | |
| 3925 | int ZSTDv07_isSkipFrame(ZSTDv07_DCtx* dctx) |
| 3926 | { |
| 3927 | return dctx->stage == ZSTDds_skipFrame; |
| 3928 | } |
| 3929 | |
| 3930 | /** ZSTDv07_decompressContinue() : |
| 3931 | * @return : nb of bytes generated into `dst` (necessarily <= `dstCapacity) |
| 3932 | * or an error code, which can be tested using ZSTDv07_isError() */ |
| 3933 | size_t ZSTDv07_decompressContinue(ZSTDv07_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize) |
| 3934 | { |
| 3935 | /* Sanity check */ |
| 3936 | if (srcSize != dctx->expected) return ERROR(srcSize_wrong); |
| 3937 | if (dstCapacity) ZSTDv07_checkContinuity(dctx, dst); |
| 3938 | |
| 3939 | switch (dctx->stage) |
| 3940 | { |
| 3941 | case ZSTDds_getFrameHeaderSize : |
| 3942 | if (srcSize != ZSTDv07_frameHeaderSize_min) return ERROR(srcSize_wrong); /* impossible */ |
| 3943 | if ((MEM_readLE32(src) & 0xFFFFFFF0U) == ZSTDv07_MAGIC_SKIPPABLE_START) { |
| 3944 | memcpy(dctx->headerBuffer, src, ZSTDv07_frameHeaderSize_min); |
| 3945 | dctx->expected = ZSTDv07_skippableHeaderSize - ZSTDv07_frameHeaderSize_min; /* magic number + skippable frame length */ |
| 3946 | dctx->stage = ZSTDds_decodeSkippableHeader; |
| 3947 | return 0; |
| 3948 | } |
| 3949 | dctx->headerSize = ZSTDv07_frameHeaderSize(src, ZSTDv07_frameHeaderSize_min); |
| 3950 | if (ZSTDv07_isError(dctx->headerSize)) return dctx->headerSize; |
| 3951 | memcpy(dctx->headerBuffer, src, ZSTDv07_frameHeaderSize_min); |
| 3952 | if (dctx->headerSize > ZSTDv07_frameHeaderSize_min) { |
| 3953 | dctx->expected = dctx->headerSize - ZSTDv07_frameHeaderSize_min; |
| 3954 | dctx->stage = ZSTDds_decodeFrameHeader; |
| 3955 | return 0; |
| 3956 | } |
| 3957 | dctx->expected = 0; /* not necessary to copy more */ |
| 3958 | /* fall-through */ |
| 3959 | case ZSTDds_decodeFrameHeader: |
| 3960 | { size_t result; |
| 3961 | memcpy(dctx->headerBuffer + ZSTDv07_frameHeaderSize_min, src, dctx->expected); |
| 3962 | result = ZSTDv07_decodeFrameHeader(dctx, dctx->headerBuffer, dctx->headerSize); |
| 3963 | if (ZSTDv07_isError(result)) return result; |
| 3964 | dctx->expected = ZSTDv07_blockHeaderSize; |
| 3965 | dctx->stage = ZSTDds_decodeBlockHeader; |
| 3966 | return 0; |
| 3967 | } |
| 3968 | case ZSTDds_decodeBlockHeader: |
| 3969 | { blockProperties_t bp; |
| 3970 | size_t const cBlockSize = ZSTDv07_getcBlockSize(src, ZSTDv07_blockHeaderSize, &bp); |
| 3971 | if (ZSTDv07_isError(cBlockSize)) return cBlockSize; |
| 3972 | if (bp.blockType == bt_end) { |
| 3973 | if (dctx->fParams.checksumFlag) { |
| 3974 | U64 const h64 = XXH64_digest(&dctx->xxhState); |
| 3975 | U32 const h32 = (U32)(h64>>11) & ((1<<22)-1); |
| 3976 | const BYTE* const ip = (const BYTE*)src; |
| 3977 | U32 const check32 = ip[2] + (ip[1] << 8) + ((ip[0] & 0x3F) << 16); |
| 3978 | if (check32 != h32) return ERROR(checksum_wrong); |
| 3979 | } |
| 3980 | dctx->expected = 0; |
| 3981 | dctx->stage = ZSTDds_getFrameHeaderSize; |
| 3982 | } else { |
| 3983 | dctx->expected = cBlockSize; |
| 3984 | dctx->bType = bp.blockType; |
| 3985 | dctx->stage = ZSTDds_decompressBlock; |
| 3986 | } |
| 3987 | return 0; |
| 3988 | } |
| 3989 | case ZSTDds_decompressBlock: |
| 3990 | { size_t rSize; |
| 3991 | switch(dctx->bType) |
| 3992 | { |
| 3993 | case bt_compressed: |
| 3994 | rSize = ZSTDv07_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize); |
| 3995 | break; |
| 3996 | case bt_raw : |
| 3997 | rSize = ZSTDv07_copyRawBlock(dst, dstCapacity, src, srcSize); |
| 3998 | break; |
| 3999 | case bt_rle : |
| 4000 | return ERROR(GENERIC); /* not yet handled */ |
| 4001 | break; |
| 4002 | case bt_end : /* should never happen (filtered at phase 1) */ |
| 4003 | rSize = 0; |
| 4004 | break; |
| 4005 | default: |
| 4006 | return ERROR(GENERIC); /* impossible */ |
| 4007 | } |
| 4008 | dctx->stage = ZSTDds_decodeBlockHeader; |
| 4009 | dctx->expected = ZSTDv07_blockHeaderSize; |
| 4010 | if (ZSTDv07_isError(rSize)) return rSize; |
| 4011 | dctx->previousDstEnd = (char*)dst + rSize; |
| 4012 | if (dctx->fParams.checksumFlag) XXH64_update(&dctx->xxhState, dst, rSize); |
| 4013 | return rSize; |
| 4014 | } |
| 4015 | case ZSTDds_decodeSkippableHeader: |
| 4016 | { memcpy(dctx->headerBuffer + ZSTDv07_frameHeaderSize_min, src, dctx->expected); |
| 4017 | dctx->expected = MEM_readLE32(dctx->headerBuffer + 4); |
| 4018 | dctx->stage = ZSTDds_skipFrame; |
| 4019 | return 0; |
| 4020 | } |
| 4021 | case ZSTDds_skipFrame: |
| 4022 | { dctx->expected = 0; |
| 4023 | dctx->stage = ZSTDds_getFrameHeaderSize; |
| 4024 | return 0; |
| 4025 | } |
| 4026 | default: |
| 4027 | return ERROR(GENERIC); /* impossible */ |
| 4028 | } |
| 4029 | } |
| 4030 | |
| 4031 | |
| 4032 | static size_t ZSTDv07_refDictContent(ZSTDv07_DCtx* dctx, const void* dict, size_t dictSize) |
| 4033 | { |
| 4034 | dctx->dictEnd = dctx->previousDstEnd; |
| 4035 | dctx->vBase = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); |
| 4036 | dctx->base = dict; |
| 4037 | dctx->previousDstEnd = (const char*)dict + dictSize; |
| 4038 | return 0; |
| 4039 | } |
| 4040 | |
| 4041 | static size_t ZSTDv07_loadEntropy(ZSTDv07_DCtx* dctx, const void* const dict, size_t const dictSize) |
| 4042 | { |
| 4043 | const BYTE* dictPtr = (const BYTE*)dict; |
| 4044 | const BYTE* const dictEnd = dictPtr + dictSize; |
| 4045 | |
| 4046 | { size_t const hSize = HUFv07_readDTableX4(dctx->hufTable, dict, dictSize); |
| 4047 | if (HUFv07_isError(hSize)) return ERROR(dictionary_corrupted); |
| 4048 | dictPtr += hSize; |
| 4049 | } |
| 4050 | |
| 4051 | { short offcodeNCount[MaxOff+1]; |
| 4052 | U32 offcodeMaxValue=MaxOff, offcodeLog; |
| 4053 | size_t const offcodeHeaderSize = FSEv07_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr); |
| 4054 | if (FSEv07_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted); |
| 4055 | if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted); |
| 4056 | { size_t const errorCode = FSEv07_buildDTable(dctx->OffTable, offcodeNCount, offcodeMaxValue, offcodeLog); |
| 4057 | if (FSEv07_isError(errorCode)) return ERROR(dictionary_corrupted); } |
| 4058 | dictPtr += offcodeHeaderSize; |
| 4059 | } |
| 4060 | |
| 4061 | { short matchlengthNCount[MaxML+1]; |
| 4062 | unsigned matchlengthMaxValue = MaxML, matchlengthLog; |
| 4063 | size_t const matchlengthHeaderSize = FSEv07_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr); |
| 4064 | if (FSEv07_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted); |
| 4065 | if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted); |
| 4066 | { size_t const errorCode = FSEv07_buildDTable(dctx->MLTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog); |
| 4067 | if (FSEv07_isError(errorCode)) return ERROR(dictionary_corrupted); } |
| 4068 | dictPtr += matchlengthHeaderSize; |
| 4069 | } |
| 4070 | |
| 4071 | { short litlengthNCount[MaxLL+1]; |
| 4072 | unsigned litlengthMaxValue = MaxLL, litlengthLog; |
| 4073 | size_t const litlengthHeaderSize = FSEv07_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr); |
| 4074 | if (FSEv07_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted); |
| 4075 | if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted); |
| 4076 | { size_t const errorCode = FSEv07_buildDTable(dctx->LLTable, litlengthNCount, litlengthMaxValue, litlengthLog); |
| 4077 | if (FSEv07_isError(errorCode)) return ERROR(dictionary_corrupted); } |
| 4078 | dictPtr += litlengthHeaderSize; |
| 4079 | } |
| 4080 | |
| 4081 | if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted); |
| 4082 | dctx->rep[0] = MEM_readLE32(dictPtr+0); if (dctx->rep[0] == 0 || dctx->rep[0] >= dictSize) return ERROR(dictionary_corrupted); |
| 4083 | dctx->rep[1] = MEM_readLE32(dictPtr+4); if (dctx->rep[1] == 0 || dctx->rep[1] >= dictSize) return ERROR(dictionary_corrupted); |
| 4084 | dctx->rep[2] = MEM_readLE32(dictPtr+8); if (dctx->rep[2] == 0 || dctx->rep[2] >= dictSize) return ERROR(dictionary_corrupted); |
| 4085 | dictPtr += 12; |
| 4086 | |
| 4087 | dctx->litEntropy = dctx->fseEntropy = 1; |
| 4088 | return dictPtr - (const BYTE*)dict; |
| 4089 | } |
| 4090 | |
| 4091 | static size_t ZSTDv07_decompress_insertDictionary(ZSTDv07_DCtx* dctx, const void* dict, size_t dictSize) |
| 4092 | { |
| 4093 | if (dictSize < 8) return ZSTDv07_refDictContent(dctx, dict, dictSize); |
| 4094 | { U32 const magic = MEM_readLE32(dict); |
| 4095 | if (magic != ZSTDv07_DICT_MAGIC) { |
| 4096 | return ZSTDv07_refDictContent(dctx, dict, dictSize); /* pure content mode */ |
| 4097 | } } |
| 4098 | dctx->dictID = MEM_readLE32((const char*)dict + 4); |
| 4099 | |
| 4100 | /* load entropy tables */ |
| 4101 | dict = (const char*)dict + 8; |
| 4102 | dictSize -= 8; |
| 4103 | { size_t const eSize = ZSTDv07_loadEntropy(dctx, dict, dictSize); |
| 4104 | if (ZSTDv07_isError(eSize)) return ERROR(dictionary_corrupted); |
| 4105 | dict = (const char*)dict + eSize; |
| 4106 | dictSize -= eSize; |
| 4107 | } |
| 4108 | |
| 4109 | /* reference dictionary content */ |
| 4110 | return ZSTDv07_refDictContent(dctx, dict, dictSize); |
| 4111 | } |
| 4112 | |
| 4113 | |
| 4114 | size_t ZSTDv07_decompressBegin_usingDict(ZSTDv07_DCtx* dctx, const void* dict, size_t dictSize) |
| 4115 | { |
| 4116 | { size_t const errorCode = ZSTDv07_decompressBegin(dctx); |
| 4117 | if (ZSTDv07_isError(errorCode)) return errorCode; } |
| 4118 | |
| 4119 | if (dict && dictSize) { |
| 4120 | size_t const errorCode = ZSTDv07_decompress_insertDictionary(dctx, dict, dictSize); |
| 4121 | if (ZSTDv07_isError(errorCode)) return ERROR(dictionary_corrupted); |
| 4122 | } |
| 4123 | |
| 4124 | return 0; |
| 4125 | } |
| 4126 | |
| 4127 | |
| 4128 | struct ZSTDv07_DDict_s { |
| 4129 | void* dict; |
| 4130 | size_t dictSize; |
| 4131 | ZSTDv07_DCtx* refContext; |
| 4132 | }; /* typedef'd tp ZSTDv07_CDict within zstd.h */ |
| 4133 | |
| 4134 | static ZSTDv07_DDict* ZSTDv07_createDDict_advanced(const void* dict, size_t dictSize, ZSTDv07_customMem customMem) |
| 4135 | { |
| 4136 | if (!customMem.customAlloc && !customMem.customFree) |
| 4137 | customMem = defaultCustomMem; |
| 4138 | |
| 4139 | if (!customMem.customAlloc || !customMem.customFree) |
| 4140 | return NULL; |
| 4141 | |
| 4142 | { ZSTDv07_DDict* const ddict = (ZSTDv07_DDict*) customMem.customAlloc(customMem.opaque, sizeof(*ddict)); |
| 4143 | void* const dictContent = customMem.customAlloc(customMem.opaque, dictSize); |
| 4144 | ZSTDv07_DCtx* const dctx = ZSTDv07_createDCtx_advanced(customMem); |
| 4145 | |
| 4146 | if (!dictContent || !ddict || !dctx) { |
| 4147 | customMem.customFree(customMem.opaque, dictContent); |
| 4148 | customMem.customFree(customMem.opaque, ddict); |
| 4149 | customMem.customFree(customMem.opaque, dctx); |
| 4150 | return NULL; |
| 4151 | } |
| 4152 | |
| 4153 | memcpy(dictContent, dict, dictSize); |
| 4154 | { size_t const errorCode = ZSTDv07_decompressBegin_usingDict(dctx, dictContent, dictSize); |
| 4155 | if (ZSTDv07_isError(errorCode)) { |
| 4156 | customMem.customFree(customMem.opaque, dictContent); |
| 4157 | customMem.customFree(customMem.opaque, ddict); |
| 4158 | customMem.customFree(customMem.opaque, dctx); |
| 4159 | return NULL; |
| 4160 | } } |
| 4161 | |
| 4162 | ddict->dict = dictContent; |
| 4163 | ddict->dictSize = dictSize; |
| 4164 | ddict->refContext = dctx; |
| 4165 | return ddict; |
| 4166 | } |
| 4167 | } |
| 4168 | |
| 4169 | /*! ZSTDv07_createDDict() : |
| 4170 | * Create a digested dictionary, ready to start decompression without startup delay. |
| 4171 | * `dict` can be released after `ZSTDv07_DDict` creation */ |
| 4172 | ZSTDv07_DDict* ZSTDv07_createDDict(const void* dict, size_t dictSize) |
| 4173 | { |
| 4174 | ZSTDv07_customMem const allocator = { NULL, NULL, NULL }; |
| 4175 | return ZSTDv07_createDDict_advanced(dict, dictSize, allocator); |
| 4176 | } |
| 4177 | |
| 4178 | size_t ZSTDv07_freeDDict(ZSTDv07_DDict* ddict) |
| 4179 | { |
| 4180 | ZSTDv07_freeFunction const cFree = ddict->refContext->customMem.customFree; |
| 4181 | void* const opaque = ddict->refContext->customMem.opaque; |
| 4182 | ZSTDv07_freeDCtx(ddict->refContext); |
| 4183 | cFree(opaque, ddict->dict); |
| 4184 | cFree(opaque, ddict); |
| 4185 | return 0; |
| 4186 | } |
| 4187 | |
| 4188 | /*! ZSTDv07_decompress_usingDDict() : |
| 4189 | * Decompression using a pre-digested Dictionary |
| 4190 | * Use dictionary without significant overhead. */ |
| 4191 | ZSTDLIBv07_API size_t ZSTDv07_decompress_usingDDict(ZSTDv07_DCtx* dctx, |
| 4192 | void* dst, size_t dstCapacity, |
| 4193 | const void* src, size_t srcSize, |
| 4194 | const ZSTDv07_DDict* ddict) |
| 4195 | { |
| 4196 | return ZSTDv07_decompress_usingPreparedDCtx(dctx, ddict->refContext, |
| 4197 | dst, dstCapacity, |
| 4198 | src, srcSize); |
| 4199 | } |
| 4200 | /* |
| 4201 | Buffered version of Zstd compression library |
| 4202 | Copyright (C) 2015-2016, Yann Collet. |
| 4203 | |
| 4204 | BSD 2-Clause License (https://opensource.org/licenses/bsd-license.php) |
| 4205 | |
| 4206 | Redistribution and use in source and binary forms, with or without |
| 4207 | modification, are permitted provided that the following conditions are |
| 4208 | met: |
| 4209 | * Redistributions of source code must retain the above copyright |
| 4210 | notice, this list of conditions and the following disclaimer. |
| 4211 | * Redistributions in binary form must reproduce the above |
| 4212 | copyright notice, this list of conditions and the following disclaimer |
| 4213 | in the documentation and/or other materials provided with the |
| 4214 | distribution. |
| 4215 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 4216 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 4217 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 4218 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 4219 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 4220 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 4221 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 4222 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 4223 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 4224 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 4225 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 4226 | |
| 4227 | You can contact the author at : |
| 4228 | - zstd homepage : https://facebook.github.io/zstd/ |
| 4229 | */ |
| 4230 | |
| 4231 | |
| 4232 | |
| 4233 | /*-*************************************************************************** |
| 4234 | * Streaming decompression howto |
| 4235 | * |
| 4236 | * A ZBUFFv07_DCtx object is required to track streaming operations. |
| 4237 | * Use ZBUFFv07_createDCtx() and ZBUFFv07_freeDCtx() to create/release resources. |
| 4238 | * Use ZBUFFv07_decompressInit() to start a new decompression operation, |
| 4239 | * or ZBUFFv07_decompressInitDictionary() if decompression requires a dictionary. |
| 4240 | * Note that ZBUFFv07_DCtx objects can be re-init multiple times. |
| 4241 | * |
| 4242 | * Use ZBUFFv07_decompressContinue() repetitively to consume your input. |
| 4243 | * *srcSizePtr and *dstCapacityPtr can be any size. |
| 4244 | * The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. |
| 4245 | * Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. |
| 4246 | * The content of @dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change @dst. |
| 4247 | * @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency), |
| 4248 | * or 0 when a frame is completely decoded, |
| 4249 | * or an error code, which can be tested using ZBUFFv07_isError(). |
| 4250 | * |
| 4251 | * Hint : recommended buffer sizes (not compulsory) : ZBUFFv07_recommendedDInSize() and ZBUFFv07_recommendedDOutSize() |
| 4252 | * output : ZBUFFv07_recommendedDOutSize==128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. |
| 4253 | * input : ZBUFFv07_recommendedDInSize == 128KB + 3; |
| 4254 | * just follow indications from ZBUFFv07_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . |
| 4255 | * *******************************************************************************/ |
| 4256 | |
| 4257 | typedef enum { ZBUFFds_init, ZBUFFds_loadHeader, |
| 4258 | ZBUFFds_read, ZBUFFds_load, ZBUFFds_flush } ZBUFFv07_dStage; |
| 4259 | |
| 4260 | /* *** Resource management *** */ |
| 4261 | struct ZBUFFv07_DCtx_s { |
| 4262 | ZSTDv07_DCtx* zd; |
| 4263 | ZSTDv07_frameParams fParams; |
| 4264 | ZBUFFv07_dStage stage; |
| 4265 | char* inBuff; |
| 4266 | size_t inBuffSize; |
| 4267 | size_t inPos; |
| 4268 | char* outBuff; |
| 4269 | size_t outBuffSize; |
| 4270 | size_t outStart; |
| 4271 | size_t outEnd; |
| 4272 | size_t blockSize; |
| 4273 | BYTE headerBuffer[ZSTDv07_FRAMEHEADERSIZE_MAX]; |
| 4274 | size_t lhSize; |
| 4275 | ZSTDv07_customMem customMem; |
| 4276 | }; /* typedef'd to ZBUFFv07_DCtx within "zstd_buffered.h" */ |
| 4277 | |
| 4278 | ZSTDLIBv07_API ZBUFFv07_DCtx* ZBUFFv07_createDCtx_advanced(ZSTDv07_customMem customMem); |
| 4279 | |
| 4280 | ZBUFFv07_DCtx* ZBUFFv07_createDCtx(void) |
| 4281 | { |
| 4282 | return ZBUFFv07_createDCtx_advanced(defaultCustomMem); |
| 4283 | } |
| 4284 | |
| 4285 | ZBUFFv07_DCtx* ZBUFFv07_createDCtx_advanced(ZSTDv07_customMem customMem) |
| 4286 | { |
| 4287 | ZBUFFv07_DCtx* zbd; |
| 4288 | |
| 4289 | if (!customMem.customAlloc && !customMem.customFree) |
| 4290 | customMem = defaultCustomMem; |
| 4291 | |
| 4292 | if (!customMem.customAlloc || !customMem.customFree) |
| 4293 | return NULL; |
| 4294 | |
| 4295 | zbd = (ZBUFFv07_DCtx*)customMem.customAlloc(customMem.opaque, sizeof(ZBUFFv07_DCtx)); |
| 4296 | if (zbd==NULL) return NULL; |
| 4297 | memset(zbd, 0, sizeof(ZBUFFv07_DCtx)); |
| 4298 | memcpy(&zbd->customMem, &customMem, sizeof(ZSTDv07_customMem)); |
| 4299 | zbd->zd = ZSTDv07_createDCtx_advanced(customMem); |
| 4300 | if (zbd->zd == NULL) { ZBUFFv07_freeDCtx(zbd); return NULL; } |
| 4301 | zbd->stage = ZBUFFds_init; |
| 4302 | return zbd; |
| 4303 | } |
| 4304 | |
| 4305 | size_t ZBUFFv07_freeDCtx(ZBUFFv07_DCtx* zbd) |
| 4306 | { |
| 4307 | if (zbd==NULL) return 0; /* support free on null */ |
| 4308 | ZSTDv07_freeDCtx(zbd->zd); |
| 4309 | if (zbd->inBuff) zbd->customMem.customFree(zbd->customMem.opaque, zbd->inBuff); |
| 4310 | if (zbd->outBuff) zbd->customMem.customFree(zbd->customMem.opaque, zbd->outBuff); |
| 4311 | zbd->customMem.customFree(zbd->customMem.opaque, zbd); |
| 4312 | return 0; |
| 4313 | } |
| 4314 | |
| 4315 | |
| 4316 | /* *** Initialization *** */ |
| 4317 | |
| 4318 | size_t ZBUFFv07_decompressInitDictionary(ZBUFFv07_DCtx* zbd, const void* dict, size_t dictSize) |
| 4319 | { |
| 4320 | zbd->stage = ZBUFFds_loadHeader; |
| 4321 | zbd->lhSize = zbd->inPos = zbd->outStart = zbd->outEnd = 0; |
| 4322 | return ZSTDv07_decompressBegin_usingDict(zbd->zd, dict, dictSize); |
| 4323 | } |
| 4324 | |
| 4325 | size_t ZBUFFv07_decompressInit(ZBUFFv07_DCtx* zbd) |
| 4326 | { |
| 4327 | return ZBUFFv07_decompressInitDictionary(zbd, NULL, 0); |
| 4328 | } |
| 4329 | |
| 4330 | |
| 4331 | /* internal util function */ |
| 4332 | MEM_STATIC size_t ZBUFFv07_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize) |
| 4333 | { |
| 4334 | size_t const length = MIN(dstCapacity, srcSize); |
| 4335 | if (length > 0) { |
| 4336 | memcpy(dst, src, length); |
| 4337 | } |
| 4338 | return length; |
| 4339 | } |
| 4340 | |
| 4341 | |
| 4342 | /* *** Decompression *** */ |
| 4343 | |
| 4344 | size_t ZBUFFv07_decompressContinue(ZBUFFv07_DCtx* zbd, |
| 4345 | void* dst, size_t* dstCapacityPtr, |
| 4346 | const void* src, size_t* srcSizePtr) |
| 4347 | { |
| 4348 | const char* const istart = (const char*)src; |
| 4349 | const char* const iend = istart + *srcSizePtr; |
| 4350 | const char* ip = istart; |
| 4351 | char* const ostart = (char*)dst; |
| 4352 | char* const oend = ostart + *dstCapacityPtr; |
| 4353 | char* op = ostart; |
| 4354 | U32 notDone = 1; |
| 4355 | |
| 4356 | while (notDone) { |
| 4357 | switch(zbd->stage) |
| 4358 | { |
| 4359 | case ZBUFFds_init : |
| 4360 | return ERROR(init_missing); |
| 4361 | |
| 4362 | case ZBUFFds_loadHeader : |
| 4363 | { size_t const hSize = ZSTDv07_getFrameParams(&(zbd->fParams), zbd->headerBuffer, zbd->lhSize); |
| 4364 | if (ZSTDv07_isError(hSize)) return hSize; |
| 4365 | if (hSize != 0) { |
| 4366 | size_t const toLoad = hSize - zbd->lhSize; /* if hSize!=0, hSize > zbd->lhSize */ |
| 4367 | if (toLoad > (size_t)(iend-ip)) { /* not enough input to load full header */ |
| 4368 | if (ip != NULL) |
| 4369 | memcpy(zbd->headerBuffer + zbd->lhSize, ip, iend-ip); |
| 4370 | zbd->lhSize += iend-ip; |
| 4371 | *dstCapacityPtr = 0; |
| 4372 | return (hSize - zbd->lhSize) + ZSTDv07_blockHeaderSize; /* remaining header bytes + next block header */ |
| 4373 | } |
| 4374 | memcpy(zbd->headerBuffer + zbd->lhSize, ip, toLoad); zbd->lhSize = hSize; ip += toLoad; |
| 4375 | break; |
| 4376 | } } |
| 4377 | |
| 4378 | /* Consume header */ |
| 4379 | { size_t const h1Size = ZSTDv07_nextSrcSizeToDecompress(zbd->zd); /* == ZSTDv07_frameHeaderSize_min */ |
| 4380 | size_t const h1Result = ZSTDv07_decompressContinue(zbd->zd, NULL, 0, zbd->headerBuffer, h1Size); |
| 4381 | if (ZSTDv07_isError(h1Result)) return h1Result; |
| 4382 | if (h1Size < zbd->lhSize) { /* long header */ |
| 4383 | size_t const h2Size = ZSTDv07_nextSrcSizeToDecompress(zbd->zd); |
| 4384 | size_t const h2Result = ZSTDv07_decompressContinue(zbd->zd, NULL, 0, zbd->headerBuffer+h1Size, h2Size); |
| 4385 | if (ZSTDv07_isError(h2Result)) return h2Result; |
| 4386 | } } |
| 4387 | |
| 4388 | zbd->fParams.windowSize = MAX(zbd->fParams.windowSize, 1U << ZSTDv07_WINDOWLOG_ABSOLUTEMIN); |
| 4389 | |
| 4390 | /* Frame header instruct buffer sizes */ |
| 4391 | { size_t const blockSize = MIN(zbd->fParams.windowSize, ZSTDv07_BLOCKSIZE_ABSOLUTEMAX); |
| 4392 | zbd->blockSize = blockSize; |
| 4393 | if (zbd->inBuffSize < blockSize) { |
| 4394 | zbd->customMem.customFree(zbd->customMem.opaque, zbd->inBuff); |
| 4395 | zbd->inBuffSize = blockSize; |
| 4396 | zbd->inBuff = (char*)zbd->customMem.customAlloc(zbd->customMem.opaque, blockSize); |
| 4397 | if (zbd->inBuff == NULL) return ERROR(memory_allocation); |
| 4398 | } |
| 4399 | { size_t const neededOutSize = zbd->fParams.windowSize + blockSize + WILDCOPY_OVERLENGTH * 2; |
| 4400 | if (zbd->outBuffSize < neededOutSize) { |
| 4401 | zbd->customMem.customFree(zbd->customMem.opaque, zbd->outBuff); |
| 4402 | zbd->outBuffSize = neededOutSize; |
| 4403 | zbd->outBuff = (char*)zbd->customMem.customAlloc(zbd->customMem.opaque, neededOutSize); |
| 4404 | if (zbd->outBuff == NULL) return ERROR(memory_allocation); |
| 4405 | } } } |
| 4406 | zbd->stage = ZBUFFds_read; |
| 4407 | /* pass-through */ |
| 4408 | /* fall-through */ |
| 4409 | case ZBUFFds_read: |
| 4410 | { size_t const neededInSize = ZSTDv07_nextSrcSizeToDecompress(zbd->zd); |
| 4411 | if (neededInSize==0) { /* end of frame */ |
| 4412 | zbd->stage = ZBUFFds_init; |
| 4413 | notDone = 0; |
| 4414 | break; |
| 4415 | } |
| 4416 | if ((size_t)(iend-ip) >= neededInSize) { /* decode directly from src */ |
| 4417 | const int isSkipFrame = ZSTDv07_isSkipFrame(zbd->zd); |
| 4418 | size_t const decodedSize = ZSTDv07_decompressContinue(zbd->zd, |
| 4419 | zbd->outBuff + zbd->outStart, (isSkipFrame ? 0 : zbd->outBuffSize - zbd->outStart), |
| 4420 | ip, neededInSize); |
| 4421 | if (ZSTDv07_isError(decodedSize)) return decodedSize; |
| 4422 | ip += neededInSize; |
| 4423 | if (!decodedSize && !isSkipFrame) break; /* this was just a header */ |
| 4424 | zbd->outEnd = zbd->outStart + decodedSize; |
| 4425 | zbd->stage = ZBUFFds_flush; |
| 4426 | break; |
| 4427 | } |
| 4428 | if (ip==iend) { notDone = 0; break; } /* no more input */ |
| 4429 | zbd->stage = ZBUFFds_load; |
| 4430 | } |
| 4431 | /* fall-through */ |
| 4432 | case ZBUFFds_load: |
| 4433 | { size_t const neededInSize = ZSTDv07_nextSrcSizeToDecompress(zbd->zd); |
| 4434 | size_t const toLoad = neededInSize - zbd->inPos; /* should always be <= remaining space within inBuff */ |
| 4435 | size_t loadedSize; |
| 4436 | if (toLoad > zbd->inBuffSize - zbd->inPos) return ERROR(corruption_detected); /* should never happen */ |
| 4437 | loadedSize = ZBUFFv07_limitCopy(zbd->inBuff + zbd->inPos, toLoad, ip, iend-ip); |
| 4438 | ip += loadedSize; |
| 4439 | zbd->inPos += loadedSize; |
| 4440 | if (loadedSize < toLoad) { notDone = 0; break; } /* not enough input, wait for more */ |
| 4441 | |
| 4442 | /* decode loaded input */ |
| 4443 | { const int isSkipFrame = ZSTDv07_isSkipFrame(zbd->zd); |
| 4444 | size_t const decodedSize = ZSTDv07_decompressContinue(zbd->zd, |
| 4445 | zbd->outBuff + zbd->outStart, zbd->outBuffSize - zbd->outStart, |
| 4446 | zbd->inBuff, neededInSize); |
| 4447 | if (ZSTDv07_isError(decodedSize)) return decodedSize; |
| 4448 | zbd->inPos = 0; /* input is consumed */ |
| 4449 | if (!decodedSize && !isSkipFrame) { zbd->stage = ZBUFFds_read; break; } /* this was just a header */ |
| 4450 | zbd->outEnd = zbd->outStart + decodedSize; |
| 4451 | zbd->stage = ZBUFFds_flush; |
| 4452 | /* break; */ |
| 4453 | /* pass-through */ |
| 4454 | } |
| 4455 | } |
| 4456 | /* fall-through */ |
| 4457 | case ZBUFFds_flush: |
| 4458 | { size_t const toFlushSize = zbd->outEnd - zbd->outStart; |
| 4459 | size_t const flushedSize = ZBUFFv07_limitCopy(op, oend-op, zbd->outBuff + zbd->outStart, toFlushSize); |
| 4460 | op += flushedSize; |
| 4461 | zbd->outStart += flushedSize; |
| 4462 | if (flushedSize == toFlushSize) { |
| 4463 | zbd->stage = ZBUFFds_read; |
| 4464 | if (zbd->outStart + zbd->blockSize > zbd->outBuffSize) |
| 4465 | zbd->outStart = zbd->outEnd = 0; |
| 4466 | break; |
| 4467 | } |
| 4468 | /* cannot flush everything */ |
| 4469 | notDone = 0; |
| 4470 | break; |
| 4471 | } |
| 4472 | default: return ERROR(GENERIC); /* impossible */ |
| 4473 | } } |
| 4474 | |
| 4475 | /* result */ |
| 4476 | *srcSizePtr = ip-istart; |
| 4477 | *dstCapacityPtr = op-ostart; |
| 4478 | { size_t nextSrcSizeHint = ZSTDv07_nextSrcSizeToDecompress(zbd->zd); |
| 4479 | nextSrcSizeHint -= zbd->inPos; /* already loaded*/ |
| 4480 | return nextSrcSizeHint; |
| 4481 | } |
| 4482 | } |
| 4483 | |
| 4484 | |
| 4485 | |
| 4486 | /* ************************************* |
| 4487 | * Tool functions |
| 4488 | ***************************************/ |
| 4489 | size_t ZBUFFv07_recommendedDInSize(void) { return ZSTDv07_BLOCKSIZE_ABSOLUTEMAX + ZSTDv07_blockHeaderSize /* block header size*/ ; } |
| 4490 | size_t ZBUFFv07_recommendedDOutSize(void) { return ZSTDv07_BLOCKSIZE_ABSOLUTEMAX; } |