2 * Copyright (c) Meta Platforms, Inc. and affiliates.
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.
14 #if defined (__cplusplus)
18 /* *************************************
20 ***************************************/
21 #include "../common/mem.h" /* MEM_STATIC */
22 #include "../common/error_private.h" /* ERROR */
23 #include "../common/zstd_internal.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTD_frameSizeInfo */
25 #if !defined (ZSTD_LEGACY_SUPPORT) || (ZSTD_LEGACY_SUPPORT == 0)
26 # undef ZSTD_LEGACY_SUPPORT
27 # define ZSTD_LEGACY_SUPPORT 8
30 #if (ZSTD_LEGACY_SUPPORT <= 1)
31 # include "zstd_v01.h"
33 #if (ZSTD_LEGACY_SUPPORT <= 2)
34 # include "zstd_v02.h"
36 #if (ZSTD_LEGACY_SUPPORT <= 3)
37 # include "zstd_v03.h"
39 #if (ZSTD_LEGACY_SUPPORT <= 4)
40 # include "zstd_v04.h"
42 #if (ZSTD_LEGACY_SUPPORT <= 5)
43 # include "zstd_v05.h"
45 #if (ZSTD_LEGACY_SUPPORT <= 6)
46 # include "zstd_v06.h"
48 #if (ZSTD_LEGACY_SUPPORT <= 7)
49 # include "zstd_v07.h"
53 @return : > 0 if supported by legacy decoder. 0 otherwise.
54 return value is the version.
56 MEM_STATIC unsigned ZSTD_isLegacy(const void* src, size_t srcSize)
59 if (srcSize<4) return 0;
60 magicNumberLE = MEM_readLE32(src);
63 #if (ZSTD_LEGACY_SUPPORT <= 1)
64 case ZSTDv01_magicNumberLE:return 1;
66 #if (ZSTD_LEGACY_SUPPORT <= 2)
67 case ZSTDv02_magicNumber : return 2;
69 #if (ZSTD_LEGACY_SUPPORT <= 3)
70 case ZSTDv03_magicNumber : return 3;
72 #if (ZSTD_LEGACY_SUPPORT <= 4)
73 case ZSTDv04_magicNumber : return 4;
75 #if (ZSTD_LEGACY_SUPPORT <= 5)
76 case ZSTDv05_MAGICNUMBER : return 5;
78 #if (ZSTD_LEGACY_SUPPORT <= 6)
79 case ZSTDv06_MAGICNUMBER : return 6;
81 #if (ZSTD_LEGACY_SUPPORT <= 7)
82 case ZSTDv07_MAGICNUMBER : return 7;
89 MEM_STATIC unsigned long long ZSTD_getDecompressedSize_legacy(const void* src, size_t srcSize)
91 U32 const version = ZSTD_isLegacy(src, srcSize);
92 if (version < 5) return 0; /* no decompressed size in frame header, or not a legacy format */
93 #if (ZSTD_LEGACY_SUPPORT <= 5)
95 ZSTDv05_parameters fParams;
96 size_t const frResult = ZSTDv05_getFrameParams(&fParams, src, srcSize);
97 if (frResult != 0) return 0;
98 return fParams.srcSize;
101 #if (ZSTD_LEGACY_SUPPORT <= 6)
103 ZSTDv06_frameParams fParams;
104 size_t const frResult = ZSTDv06_getFrameParams(&fParams, src, srcSize);
105 if (frResult != 0) return 0;
106 return fParams.frameContentSize;
109 #if (ZSTD_LEGACY_SUPPORT <= 7)
111 ZSTDv07_frameParams fParams;
112 size_t const frResult = ZSTDv07_getFrameParams(&fParams, src, srcSize);
113 if (frResult != 0) return 0;
114 return fParams.frameContentSize;
117 return 0; /* should not be possible */
121 MEM_STATIC size_t ZSTD_decompressLegacy(
122 void* dst, size_t dstCapacity,
123 const void* src, size_t compressedSize,
124 const void* dict,size_t dictSize)
126 U32 const version = ZSTD_isLegacy(src, compressedSize);
127 (void)dst; (void)dstCapacity; (void)dict; (void)dictSize; /* unused when ZSTD_LEGACY_SUPPORT >= 8 */
130 #if (ZSTD_LEGACY_SUPPORT <= 1)
132 return ZSTDv01_decompress(dst, dstCapacity, src, compressedSize);
134 #if (ZSTD_LEGACY_SUPPORT <= 2)
136 return ZSTDv02_decompress(dst, dstCapacity, src, compressedSize);
138 #if (ZSTD_LEGACY_SUPPORT <= 3)
140 return ZSTDv03_decompress(dst, dstCapacity, src, compressedSize);
142 #if (ZSTD_LEGACY_SUPPORT <= 4)
144 return ZSTDv04_decompress(dst, dstCapacity, src, compressedSize);
146 #if (ZSTD_LEGACY_SUPPORT <= 5)
149 ZSTDv05_DCtx* const zd = ZSTDv05_createDCtx();
150 if (zd==NULL) return ERROR(memory_allocation);
151 result = ZSTDv05_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
152 ZSTDv05_freeDCtx(zd);
156 #if (ZSTD_LEGACY_SUPPORT <= 6)
159 ZSTDv06_DCtx* const zd = ZSTDv06_createDCtx();
160 if (zd==NULL) return ERROR(memory_allocation);
161 result = ZSTDv06_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
162 ZSTDv06_freeDCtx(zd);
166 #if (ZSTD_LEGACY_SUPPORT <= 7)
169 ZSTDv07_DCtx* const zd = ZSTDv07_createDCtx();
170 if (zd==NULL) return ERROR(memory_allocation);
171 result = ZSTDv07_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
172 ZSTDv07_freeDCtx(zd);
177 return ERROR(prefix_unknown);
181 MEM_STATIC ZSTD_frameSizeInfo ZSTD_findFrameSizeInfoLegacy(const void *src, size_t srcSize)
183 ZSTD_frameSizeInfo frameSizeInfo;
184 U32 const version = ZSTD_isLegacy(src, srcSize);
187 #if (ZSTD_LEGACY_SUPPORT <= 1)
189 ZSTDv01_findFrameSizeInfoLegacy(src, srcSize,
190 &frameSizeInfo.compressedSize,
191 &frameSizeInfo.decompressedBound);
194 #if (ZSTD_LEGACY_SUPPORT <= 2)
196 ZSTDv02_findFrameSizeInfoLegacy(src, srcSize,
197 &frameSizeInfo.compressedSize,
198 &frameSizeInfo.decompressedBound);
201 #if (ZSTD_LEGACY_SUPPORT <= 3)
203 ZSTDv03_findFrameSizeInfoLegacy(src, srcSize,
204 &frameSizeInfo.compressedSize,
205 &frameSizeInfo.decompressedBound);
208 #if (ZSTD_LEGACY_SUPPORT <= 4)
210 ZSTDv04_findFrameSizeInfoLegacy(src, srcSize,
211 &frameSizeInfo.compressedSize,
212 &frameSizeInfo.decompressedBound);
215 #if (ZSTD_LEGACY_SUPPORT <= 5)
217 ZSTDv05_findFrameSizeInfoLegacy(src, srcSize,
218 &frameSizeInfo.compressedSize,
219 &frameSizeInfo.decompressedBound);
222 #if (ZSTD_LEGACY_SUPPORT <= 6)
224 ZSTDv06_findFrameSizeInfoLegacy(src, srcSize,
225 &frameSizeInfo.compressedSize,
226 &frameSizeInfo.decompressedBound);
229 #if (ZSTD_LEGACY_SUPPORT <= 7)
231 ZSTDv07_findFrameSizeInfoLegacy(src, srcSize,
232 &frameSizeInfo.compressedSize,
233 &frameSizeInfo.decompressedBound);
237 frameSizeInfo.compressedSize = ERROR(prefix_unknown);
238 frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
241 if (!ZSTD_isError(frameSizeInfo.compressedSize) && frameSizeInfo.compressedSize > srcSize) {
242 frameSizeInfo.compressedSize = ERROR(srcSize_wrong);
243 frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
245 /* In all cases, decompressedBound == nbBlocks * ZSTD_BLOCKSIZE_MAX.
246 * So we can compute nbBlocks without having to change every function.
248 if (frameSizeInfo.decompressedBound != ZSTD_CONTENTSIZE_ERROR) {
249 assert((frameSizeInfo.decompressedBound & (ZSTD_BLOCKSIZE_MAX - 1)) == 0);
250 frameSizeInfo.nbBlocks = (size_t)(frameSizeInfo.decompressedBound / ZSTD_BLOCKSIZE_MAX);
252 return frameSizeInfo;
255 MEM_STATIC size_t ZSTD_findFrameCompressedSizeLegacy(const void *src, size_t srcSize)
257 ZSTD_frameSizeInfo frameSizeInfo = ZSTD_findFrameSizeInfoLegacy(src, srcSize);
258 return frameSizeInfo.compressedSize;
261 MEM_STATIC size_t ZSTD_freeLegacyStreamContext(void* legacyContext, U32 version)
270 return ERROR(version_unsupported);
271 #if (ZSTD_LEGACY_SUPPORT <= 4)
272 case 4 : return ZBUFFv04_freeDCtx((ZBUFFv04_DCtx*)legacyContext);
274 #if (ZSTD_LEGACY_SUPPORT <= 5)
275 case 5 : return ZBUFFv05_freeDCtx((ZBUFFv05_DCtx*)legacyContext);
277 #if (ZSTD_LEGACY_SUPPORT <= 6)
278 case 6 : return ZBUFFv06_freeDCtx((ZBUFFv06_DCtx*)legacyContext);
280 #if (ZSTD_LEGACY_SUPPORT <= 7)
281 case 7 : return ZBUFFv07_freeDCtx((ZBUFFv07_DCtx*)legacyContext);
287 MEM_STATIC size_t ZSTD_initLegacyStream(void** legacyContext, U32 prevVersion, U32 newVersion,
288 const void* dict, size_t dictSize)
290 DEBUGLOG(5, "ZSTD_initLegacyStream for v0.%u", newVersion);
291 if (prevVersion != newVersion) ZSTD_freeLegacyStreamContext(*legacyContext, prevVersion);
298 (void)dict; (void)dictSize;
300 #if (ZSTD_LEGACY_SUPPORT <= 4)
303 ZBUFFv04_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv04_createDCtx() : (ZBUFFv04_DCtx*)*legacyContext;
304 if (dctx==NULL) return ERROR(memory_allocation);
305 ZBUFFv04_decompressInit(dctx);
306 ZBUFFv04_decompressWithDictionary(dctx, dict, dictSize);
307 *legacyContext = dctx;
311 #if (ZSTD_LEGACY_SUPPORT <= 5)
314 ZBUFFv05_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv05_createDCtx() : (ZBUFFv05_DCtx*)*legacyContext;
315 if (dctx==NULL) return ERROR(memory_allocation);
316 ZBUFFv05_decompressInitDictionary(dctx, dict, dictSize);
317 *legacyContext = dctx;
321 #if (ZSTD_LEGACY_SUPPORT <= 6)
324 ZBUFFv06_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv06_createDCtx() : (ZBUFFv06_DCtx*)*legacyContext;
325 if (dctx==NULL) return ERROR(memory_allocation);
326 ZBUFFv06_decompressInitDictionary(dctx, dict, dictSize);
327 *legacyContext = dctx;
331 #if (ZSTD_LEGACY_SUPPORT <= 7)
334 ZBUFFv07_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv07_createDCtx() : (ZBUFFv07_DCtx*)*legacyContext;
335 if (dctx==NULL) return ERROR(memory_allocation);
336 ZBUFFv07_decompressInitDictionary(dctx, dict, dictSize);
337 *legacyContext = dctx;
346 MEM_STATIC size_t ZSTD_decompressLegacyStream(void* legacyContext, U32 version,
347 ZSTD_outBuffer* output, ZSTD_inBuffer* input)
349 DEBUGLOG(5, "ZSTD_decompressLegacyStream for v0.%u", version);
356 (void)legacyContext; (void)output; (void)input;
357 return ERROR(version_unsupported);
358 #if (ZSTD_LEGACY_SUPPORT <= 4)
361 ZBUFFv04_DCtx* dctx = (ZBUFFv04_DCtx*) legacyContext;
362 const void* src = (const char*)input->src + input->pos;
363 size_t readSize = input->size - input->pos;
364 void* dst = (char*)output->dst + output->pos;
365 size_t decodedSize = output->size - output->pos;
366 size_t const hintSize = ZBUFFv04_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
367 output->pos += decodedSize;
368 input->pos += readSize;
372 #if (ZSTD_LEGACY_SUPPORT <= 5)
375 ZBUFFv05_DCtx* dctx = (ZBUFFv05_DCtx*) legacyContext;
376 const void* src = (const char*)input->src + input->pos;
377 size_t readSize = input->size - input->pos;
378 void* dst = (char*)output->dst + output->pos;
379 size_t decodedSize = output->size - output->pos;
380 size_t const hintSize = ZBUFFv05_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
381 output->pos += decodedSize;
382 input->pos += readSize;
386 #if (ZSTD_LEGACY_SUPPORT <= 6)
389 ZBUFFv06_DCtx* dctx = (ZBUFFv06_DCtx*) legacyContext;
390 const void* src = (const char*)input->src + input->pos;
391 size_t readSize = input->size - input->pos;
392 void* dst = (char*)output->dst + output->pos;
393 size_t decodedSize = output->size - output->pos;
394 size_t const hintSize = ZBUFFv06_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
395 output->pos += decodedSize;
396 input->pos += readSize;
400 #if (ZSTD_LEGACY_SUPPORT <= 7)
403 ZBUFFv07_DCtx* dctx = (ZBUFFv07_DCtx*) legacyContext;
404 const void* src = (const char*)input->src + input->pos;
405 size_t readSize = input->size - input->pos;
406 void* dst = (char*)output->dst + output->pos;
407 size_t decodedSize = output->size - output->pos;
408 size_t const hintSize = ZBUFFv07_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
409 output->pos += decodedSize;
410 input->pos += readSize;
418 #if defined (__cplusplus)
422 #endif /* ZSTD_LEGACY_H */