b24e7fce |
1 | /*************************************************************************** |
2 | |
3 | chd.c |
4 | |
5 | MAME Compressed Hunks of Data file format |
6 | |
7 | **************************************************************************** |
8 | |
9 | Copyright Aaron Giles |
10 | All rights reserved. |
11 | |
12 | Redistribution and use in source and binary forms, with or without |
13 | modification, are permitted provided that the following conditions are |
14 | met: |
15 | |
16 | * Redistributions of source code must retain the above copyright |
17 | notice, this list of conditions and the following disclaimer. |
18 | * Redistributions in binary form must reproduce the above copyright |
19 | notice, this list of conditions and the following disclaimer in |
20 | the documentation and/or other materials provided with the |
21 | distribution. |
22 | * Neither the name 'MAME' nor the names of its contributors may be |
23 | used to endorse or promote products derived from this software |
24 | without specific prior written permission. |
25 | |
26 | THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR |
27 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
28 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
29 | DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, |
30 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
31 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
32 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
33 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
34 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
35 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
36 | POSSIBILITY OF SUCH DAMAGE. |
37 | |
38 | ***************************************************************************/ |
39 | |
40 | #include <stddef.h> |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | #include <time.h> |
45 | |
46 | #include <libchdr/chd.h> |
47 | #include <libchdr/cdrom.h> |
48 | #include <libchdr/flac.h> |
49 | #include <libchdr/huffman.h> |
648db22b |
50 | #include <zstd.h> |
b24e7fce |
51 | |
52 | #include "LzmaEnc.h" |
53 | #include "LzmaDec.h" |
9e052883 |
54 | #if defined(__PS3__) || defined(__PSL1GHT__) |
55 | #define __MACTYPES__ |
56 | #endif |
648db22b |
57 | #include <zlib.h> |
b24e7fce |
58 | |
59 | #undef TRUE |
60 | #undef FALSE |
61 | #define TRUE 1 |
62 | #define FALSE 0 |
63 | |
64 | #undef MAX |
65 | #undef MIN |
66 | #define MAX(x, y) (((x) > (y)) ? (x) : (y)) |
67 | #define MIN(x, y) (((x) < (y)) ? (x) : (y)) |
68 | |
69 | #define SHA1_DIGEST_SIZE 20 |
70 | |
71 | /*************************************************************************** |
72 | DEBUGGING |
73 | ***************************************************************************/ |
74 | |
75 | #define PRINTF_MAX_HUNK (0) |
76 | |
77 | /*************************************************************************** |
78 | CONSTANTS |
79 | ***************************************************************************/ |
80 | |
81 | #define MAP_STACK_ENTRIES 512 /* max number of entries to use on the stack */ |
82 | #define MAP_ENTRY_SIZE 16 /* V3 and later */ |
83 | #define OLD_MAP_ENTRY_SIZE 8 /* V1-V2 */ |
84 | #define METADATA_HEADER_SIZE 16 /* metadata header size */ |
85 | |
86 | #define MAP_ENTRY_FLAG_TYPE_MASK 0x0f /* what type of hunk */ |
87 | #define MAP_ENTRY_FLAG_NO_CRC 0x10 /* no CRC is present */ |
88 | |
89 | #define CHD_V1_SECTOR_SIZE 512 /* size of a "sector" in the V1 header */ |
90 | |
91 | #define COOKIE_VALUE 0xbaadf00d |
92 | #define MAX_ZLIB_ALLOCS 64 |
93 | |
94 | #define END_OF_LIST_COOKIE "EndOfListCookie" |
95 | |
96 | #define NO_MATCH (~0) |
97 | |
98 | #ifdef WANT_RAW_DATA_SECTOR |
99 | static const uint8_t s_cd_sync_header[12] = { 0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00 }; |
100 | #endif |
101 | |
102 | /* V3-V4 entry types */ |
103 | enum |
104 | { |
105 | V34_MAP_ENTRY_TYPE_INVALID = 0, /* invalid type */ |
106 | V34_MAP_ENTRY_TYPE_COMPRESSED = 1, /* standard compression */ |
107 | V34_MAP_ENTRY_TYPE_UNCOMPRESSED = 2, /* uncompressed data */ |
108 | V34_MAP_ENTRY_TYPE_MINI = 3, /* mini: use offset as raw data */ |
109 | V34_MAP_ENTRY_TYPE_SELF_HUNK = 4, /* same as another hunk in this file */ |
110 | V34_MAP_ENTRY_TYPE_PARENT_HUNK = 5, /* same as a hunk in the parent file */ |
111 | V34_MAP_ENTRY_TYPE_2ND_COMPRESSED = 6 /* compressed with secondary algorithm (usually FLAC CDDA) */ |
112 | }; |
113 | |
114 | /* V5 compression types */ |
115 | enum |
116 | { |
117 | /* codec #0 |
118 | * these types are live when running */ |
119 | COMPRESSION_TYPE_0 = 0, |
120 | /* codec #1 */ |
121 | COMPRESSION_TYPE_1 = 1, |
122 | /* codec #2 */ |
123 | COMPRESSION_TYPE_2 = 2, |
124 | /* codec #3 */ |
125 | COMPRESSION_TYPE_3 = 3, |
126 | /* no compression; implicit length = hunkbytes */ |
127 | COMPRESSION_NONE = 4, |
128 | /* same as another block in this chd */ |
129 | COMPRESSION_SELF = 5, |
130 | /* same as a hunk's worth of units in the parent chd */ |
131 | COMPRESSION_PARENT = 6, |
132 | |
133 | /* start of small RLE run (4-bit length) |
134 | * these additional pseudo-types are used for compressed encodings: */ |
135 | COMPRESSION_RLE_SMALL, |
136 | /* start of large RLE run (8-bit length) */ |
137 | COMPRESSION_RLE_LARGE, |
138 | /* same as the last COMPRESSION_SELF block */ |
139 | COMPRESSION_SELF_0, |
140 | /* same as the last COMPRESSION_SELF block + 1 */ |
141 | COMPRESSION_SELF_1, |
142 | /* same block in the parent */ |
143 | COMPRESSION_PARENT_SELF, |
144 | /* same as the last COMPRESSION_PARENT block */ |
145 | COMPRESSION_PARENT_0, |
146 | /* same as the last COMPRESSION_PARENT block + 1 */ |
147 | COMPRESSION_PARENT_1 |
148 | }; |
149 | |
150 | /*************************************************************************** |
151 | MACROS |
152 | ***************************************************************************/ |
153 | |
154 | #define EARLY_EXIT(x) do { (void)(x); goto cleanup; } while (0) |
155 | |
156 | /*************************************************************************** |
157 | TYPE DEFINITIONS |
158 | ***************************************************************************/ |
159 | |
160 | /* interface to a codec */ |
161 | typedef struct _codec_interface codec_interface; |
162 | struct _codec_interface |
163 | { |
164 | UINT32 compression; /* type of compression */ |
165 | const char *compname; /* name of the algorithm */ |
166 | UINT8 lossy; /* is this a lossy algorithm? */ |
167 | chd_error (*init)(void *codec, UINT32 hunkbytes); /* codec initialize */ |
168 | void (*free)(void *codec); /* codec free */ |
169 | chd_error (*decompress)(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); /* decompress data */ |
170 | chd_error (*config)(void *codec, int param, void *config); /* configure */ |
171 | }; |
172 | |
173 | /* a single map entry */ |
174 | typedef struct _map_entry map_entry; |
175 | struct _map_entry |
176 | { |
177 | UINT64 offset; /* offset within the file of the data */ |
178 | UINT32 crc; /* 32-bit CRC of the data */ |
179 | UINT32 length; /* length of the data */ |
180 | UINT8 flags; /* misc flags */ |
181 | }; |
182 | |
183 | /* a single metadata entry */ |
184 | typedef struct _metadata_entry metadata_entry; |
185 | struct _metadata_entry |
186 | { |
187 | UINT64 offset; /* offset within the file of the header */ |
188 | UINT64 next; /* offset within the file of the next header */ |
189 | UINT64 prev; /* offset within the file of the previous header */ |
190 | UINT32 length; /* length of the metadata */ |
191 | UINT32 metatag; /* metadata tag */ |
192 | UINT8 flags; /* flag bits */ |
193 | }; |
194 | |
195 | /* codec-private data for the ZLIB codec */ |
196 | |
197 | typedef struct _zlib_allocator zlib_allocator; |
198 | struct _zlib_allocator |
199 | { |
200 | UINT32 * allocptr[MAX_ZLIB_ALLOCS]; |
201 | UINT32 * allocptr2[MAX_ZLIB_ALLOCS]; |
202 | }; |
203 | |
204 | typedef struct _zlib_codec_data zlib_codec_data; |
205 | struct _zlib_codec_data |
206 | { |
207 | z_stream inflater; |
208 | zlib_allocator allocator; |
209 | }; |
210 | |
211 | /* codec-private data for the LZMA codec */ |
212 | #define MAX_LZMA_ALLOCS 64 |
213 | |
214 | typedef struct _lzma_allocator lzma_allocator; |
215 | struct _lzma_allocator |
216 | { |
217 | void *(*Alloc)(void *p, size_t size); |
218 | void (*Free)(void *p, void *address); /* address can be 0 */ |
219 | void (*FreeSz)(void *p, void *address, size_t size); /* address can be 0 */ |
220 | uint32_t* allocptr[MAX_LZMA_ALLOCS]; |
221 | uint32_t* allocptr2[MAX_LZMA_ALLOCS]; |
222 | }; |
223 | |
224 | typedef struct _lzma_codec_data lzma_codec_data; |
225 | struct _lzma_codec_data |
226 | { |
227 | CLzmaDec decoder; |
228 | lzma_allocator allocator; |
229 | }; |
230 | |
9e052883 |
231 | typedef struct _huff_codec_data huff_codec_data; |
232 | struct _huff_codec_data |
233 | { |
234 | struct huffman_decoder* decoder; |
235 | }; |
236 | |
648db22b |
237 | typedef struct _zstd_codec_data zstd_codec_data; |
238 | struct _zstd_codec_data |
239 | { |
240 | ZSTD_DStream *dstream; |
241 | }; |
242 | |
b24e7fce |
243 | /* codec-private data for the CDZL codec */ |
244 | typedef struct _cdzl_codec_data cdzl_codec_data; |
245 | struct _cdzl_codec_data { |
246 | /* internal state */ |
247 | zlib_codec_data base_decompressor; |
248 | #ifdef WANT_SUBCODE |
249 | zlib_codec_data subcode_decompressor; |
250 | #endif |
251 | uint8_t* buffer; |
252 | }; |
253 | |
254 | /* codec-private data for the CDLZ codec */ |
255 | typedef struct _cdlz_codec_data cdlz_codec_data; |
256 | struct _cdlz_codec_data { |
257 | /* internal state */ |
258 | lzma_codec_data base_decompressor; |
259 | #ifdef WANT_SUBCODE |
260 | zlib_codec_data subcode_decompressor; |
261 | #endif |
262 | uint8_t* buffer; |
263 | }; |
264 | |
9e052883 |
265 | /* codec-private data for the FLAC codec */ |
266 | typedef struct _flac_codec_data flac_codec_data; |
267 | struct _flac_codec_data { |
268 | /* internal state */ |
269 | int native_endian; |
270 | flac_decoder decoder; |
271 | }; |
272 | |
b24e7fce |
273 | /* codec-private data for the CDFL codec */ |
274 | typedef struct _cdfl_codec_data cdfl_codec_data; |
275 | struct _cdfl_codec_data { |
276 | /* internal state */ |
277 | int swap_endian; |
278 | flac_decoder decoder; |
279 | #ifdef WANT_SUBCODE |
280 | zlib_codec_data subcode_decompressor; |
281 | #endif |
282 | uint8_t* buffer; |
283 | }; |
284 | |
648db22b |
285 | typedef struct _cdzs_codec_data cdzs_codec_data; |
286 | struct _cdzs_codec_data |
287 | { |
288 | zstd_codec_data base_decompressor; |
289 | #ifdef WANT_SUBCODE |
290 | zstd_codec_data subcode_decompressor; |
291 | #endif |
292 | uint8_t* buffer; |
293 | }; |
294 | |
b24e7fce |
295 | /* internal representation of an open CHD file */ |
296 | struct _chd_file |
297 | { |
298 | UINT32 cookie; /* cookie, should equal COOKIE_VALUE */ |
299 | |
300 | core_file * file; /* handle to the open core file */ |
b24e7fce |
301 | chd_header header; /* header, extracted from file */ |
302 | |
303 | chd_file * parent; /* pointer to parent file, or NULL */ |
304 | |
305 | map_entry * map; /* array of map entries */ |
306 | |
307 | #ifdef NEED_CACHE_HUNK |
308 | UINT8 * cache; /* hunk cache pointer */ |
309 | UINT32 cachehunk; /* index of currently cached hunk */ |
310 | |
311 | UINT8 * compare; /* hunk compare pointer */ |
312 | UINT32 comparehunk; /* index of current compare data */ |
313 | #endif |
314 | |
315 | UINT8 * compressed; /* pointer to buffer for compressed data */ |
316 | const codec_interface * codecintf[4]; /* interface to the codec */ |
317 | |
318 | zlib_codec_data zlib_codec_data; /* zlib codec data */ |
9e052883 |
319 | lzma_codec_data lzma_codec_data; /* lzma codec data */ |
320 | huff_codec_data huff_codec_data; /* huff codec data */ |
321 | flac_codec_data flac_codec_data; /* flac codec data */ |
648db22b |
322 | zstd_codec_data zstd_codec_data; /* zstd codec data */ |
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323 | cdzl_codec_data cdzl_codec_data; /* cdzl codec data */ |
324 | cdlz_codec_data cdlz_codec_data; /* cdlz codec data */ |
325 | cdfl_codec_data cdfl_codec_data; /* cdfl codec data */ |
648db22b |
326 | cdzs_codec_data cdzs_codec_data; /* cdzs codec data */ |
b24e7fce |
327 | |
328 | #ifdef NEED_CACHE_HUNK |
329 | UINT32 maxhunk; /* maximum hunk accessed */ |
330 | #endif |
331 | |
332 | UINT8 * file_cache; /* cache of underlying file */ |
333 | }; |
334 | |
335 | |
336 | /*************************************************************************** |
337 | GLOBAL VARIABLES |
338 | ***************************************************************************/ |
339 | |
340 | static const UINT8 nullmd5[CHD_MD5_BYTES] = { 0 }; |
341 | static const UINT8 nullsha1[CHD_SHA1_BYTES] = { 0 }; |
342 | |
343 | /*************************************************************************** |
344 | PROTOTYPES |
345 | ***************************************************************************/ |
346 | |
9e052883 |
347 | /* core_file wrappers over stdio */ |
348 | static core_file *core_stdio_fopen(char const *path); |
349 | static UINT64 core_stdio_fsize(core_file *file); |
350 | static size_t core_stdio_fread(void *ptr, size_t size, size_t nmemb, core_file *file); |
351 | static int core_stdio_fclose(core_file *file); |
352 | static int core_stdio_fclose_nonowner(core_file *file); // alternate fclose used by chd_open_file |
353 | static int core_stdio_fseek(core_file* file, INT64 offset, int whence); |
354 | |
b24e7fce |
355 | /* internal header operations */ |
356 | static chd_error header_validate(const chd_header *header); |
357 | static chd_error header_read(chd_file *chd, chd_header *header); |
358 | |
359 | /* internal hunk read/write */ |
360 | #ifdef NEED_CACHE_HUNK |
361 | static chd_error hunk_read_into_cache(chd_file *chd, UINT32 hunknum); |
362 | #endif |
363 | static chd_error hunk_read_into_memory(chd_file *chd, UINT32 hunknum, UINT8 *dest); |
364 | |
365 | /* internal map access */ |
366 | static chd_error map_read(chd_file *chd); |
367 | |
368 | /* metadata management */ |
369 | static chd_error metadata_find_entry(chd_file *chd, UINT32 metatag, UINT32 metaindex, metadata_entry *metaentry); |
370 | |
371 | /* zlib compression codec */ |
372 | static chd_error zlib_codec_init(void *codec, uint32_t hunkbytes); |
373 | static void zlib_codec_free(void *codec); |
374 | static chd_error zlib_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
375 | static voidpf zlib_fast_alloc(voidpf opaque, uInt items, uInt size); |
376 | static void zlib_fast_free(voidpf opaque, voidpf address); |
377 | static void zlib_allocator_free(voidpf opaque); |
378 | |
379 | /* lzma compression codec */ |
380 | static chd_error lzma_codec_init(void *codec, uint32_t hunkbytes); |
381 | static void lzma_codec_free(void *codec); |
382 | static chd_error lzma_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
383 | |
9e052883 |
384 | /* huff compression codec */ |
385 | static chd_error huff_codec_init(void *codec, uint32_t hunkbytes); |
386 | static void huff_codec_free(void *codec); |
387 | static chd_error huff_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
388 | |
389 | /* flac compression codec */ |
390 | static chd_error flac_codec_init(void *codec, uint32_t hunkbytes); |
391 | static void flac_codec_free(void *codec); |
392 | static chd_error flac_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
393 | |
648db22b |
394 | /* zstd compression codec */ |
395 | static chd_error zstd_codec_init(void *codec, uint32_t hunkbytes); |
396 | static void zstd_codec_free(void *codec); |
397 | static chd_error zstd_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
398 | |
399 | |
b24e7fce |
400 | /* cdzl compression codec */ |
401 | static chd_error cdzl_codec_init(void* codec, uint32_t hunkbytes); |
402 | static void cdzl_codec_free(void* codec); |
403 | static chd_error cdzl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
404 | |
405 | /* cdlz compression codec */ |
406 | static chd_error cdlz_codec_init(void* codec, uint32_t hunkbytes); |
407 | static void cdlz_codec_free(void* codec); |
408 | static chd_error cdlz_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
409 | |
410 | /* cdfl compression codec */ |
411 | static chd_error cdfl_codec_init(void* codec, uint32_t hunkbytes); |
412 | static void cdfl_codec_free(void* codec); |
413 | static chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
414 | |
648db22b |
415 | /* cdzs compression codec */ |
416 | static chd_error cdzs_codec_init(void *codec, uint32_t hunkbytes); |
417 | static void cdzs_codec_free(void *codec); |
418 | static chd_error cdzs_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
419 | |
b24e7fce |
420 | /*************************************************************************** |
421 | * LZMA ALLOCATOR HELPER |
422 | *************************************************************************** |
423 | */ |
424 | |
425 | static void *lzma_fast_alloc(void *p, size_t size); |
426 | static void lzma_fast_free(void *p, void *address); |
427 | |
428 | /*------------------------------------------------- |
429 | * lzma_allocator_init |
430 | *------------------------------------------------- |
431 | */ |
432 | |
433 | static void lzma_allocator_init(void* p) |
434 | { |
435 | lzma_allocator *codec = (lzma_allocator *)(p); |
436 | |
437 | /* reset pointer list */ |
438 | memset(codec->allocptr, 0, sizeof(codec->allocptr)); |
439 | memset(codec->allocptr2, 0, sizeof(codec->allocptr2)); |
440 | codec->Alloc = lzma_fast_alloc; |
441 | codec->Free = lzma_fast_free; |
442 | } |
443 | |
444 | /*------------------------------------------------- |
445 | * lzma_allocator_free |
446 | *------------------------------------------------- |
447 | */ |
448 | |
449 | static void lzma_allocator_free(void* p ) |
450 | { |
451 | int i; |
452 | lzma_allocator *codec = (lzma_allocator *)(p); |
453 | |
454 | /* free our memory */ |
455 | for (i = 0 ; i < MAX_LZMA_ALLOCS ; i++) |
456 | { |
457 | if (codec->allocptr[i] != NULL) |
458 | free(codec->allocptr[i]); |
459 | } |
460 | } |
461 | |
462 | /*------------------------------------------------- |
463 | * lzma_fast_alloc - fast malloc for lzma, which |
464 | * allocates and frees memory frequently |
465 | *------------------------------------------------- |
466 | */ |
467 | |
468 | /* Huge alignment values for possible SIMD optimization by compiler (NEON, SSE, AVX) */ |
469 | #define LZMA_MIN_ALIGNMENT_BITS 512 |
470 | #define LZMA_MIN_ALIGNMENT_BYTES (LZMA_MIN_ALIGNMENT_BITS / 8) |
471 | |
472 | static void *lzma_fast_alloc(void *p, size_t size) |
473 | { |
474 | int scan; |
475 | uint32_t *addr = NULL; |
476 | lzma_allocator *codec = (lzma_allocator *)(p); |
477 | uintptr_t vaddr = 0; |
478 | |
479 | /* compute the size, rounding to the nearest 1k */ |
480 | size = (size + 0x3ff) & ~0x3ff; |
481 | |
482 | /* reuse a hunk if we can */ |
483 | for (scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
484 | { |
485 | uint32_t *ptr = codec->allocptr[scan]; |
486 | if (ptr != NULL && size == *ptr) |
487 | { |
488 | /* set the low bit of the size so we don't match next time */ |
489 | *ptr |= 1; |
490 | |
491 | /* return aligned address of the block */ |
492 | return codec->allocptr2[scan]; |
493 | } |
494 | } |
495 | |
496 | /* alloc a new one and put it into the list */ |
497 | addr = (uint32_t *)malloc(size + sizeof(uint32_t) + LZMA_MIN_ALIGNMENT_BYTES); |
498 | if (addr==NULL) |
499 | return NULL; |
500 | for (scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
501 | { |
502 | if (codec->allocptr[scan] == NULL) |
503 | { |
504 | /* store block address */ |
505 | codec->allocptr[scan] = addr; |
506 | |
507 | /* compute aligned address, store it */ |
508 | vaddr = (uintptr_t)addr; |
509 | vaddr = (vaddr + sizeof(uint32_t) + (LZMA_MIN_ALIGNMENT_BYTES-1)) & (~(LZMA_MIN_ALIGNMENT_BYTES-1)); |
510 | codec->allocptr2[scan] = (uint32_t*)vaddr; |
511 | break; |
512 | } |
513 | } |
514 | |
515 | /* set the low bit of the size so we don't match next time */ |
516 | *addr = size | 1; |
517 | |
518 | /* return aligned address */ |
519 | return (void*)vaddr; |
520 | } |
521 | |
522 | /*------------------------------------------------- |
523 | * lzma_fast_free - fast free for lzma, which |
524 | * allocates and frees memory frequently |
525 | *------------------------------------------------- |
526 | */ |
527 | |
528 | static void lzma_fast_free(void *p, void *address) |
529 | { |
530 | int scan; |
531 | uint32_t *ptr = NULL; |
532 | lzma_allocator *codec = NULL; |
533 | |
534 | if (address == NULL) |
535 | return; |
536 | |
537 | codec = (lzma_allocator *)(p); |
538 | |
539 | /* find the hunk */ |
540 | ptr = (uint32_t *)address; |
541 | for (scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
542 | { |
543 | if (ptr == codec->allocptr2[scan]) |
544 | { |
545 | /* clear the low bit of the size to allow matches */ |
546 | *codec->allocptr[scan] &= ~1; |
547 | return; |
548 | } |
549 | } |
550 | } |
551 | |
552 | /*************************************************************************** |
553 | * LZMA DECOMPRESSOR |
554 | *************************************************************************** |
555 | */ |
556 | |
557 | /*------------------------------------------------- |
558 | * lzma_codec_init - constructor |
559 | *------------------------------------------------- |
560 | */ |
561 | |
562 | static chd_error lzma_codec_init(void* codec, uint32_t hunkbytes) |
563 | { |
564 | CLzmaEncHandle enc; |
565 | CLzmaEncProps encoder_props; |
566 | Byte decoder_props[LZMA_PROPS_SIZE]; |
567 | SizeT props_size; |
568 | lzma_allocator* alloc; |
569 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
570 | |
571 | /* construct the decoder */ |
572 | LzmaDec_Construct(&lzma_codec->decoder); |
573 | |
574 | /* FIXME: this code is written in a way that makes it impossible to safely upgrade the LZMA SDK |
575 | * This code assumes that the current version of the encoder imposes the same requirements on the |
576 | * decoder as the encoder used to produce the file. This is not necessarily true. The format |
577 | * needs to be changed so the encoder properties are written to the file. |
578 | |
579 | * configure the properties like the compressor did */ |
580 | LzmaEncProps_Init(&encoder_props); |
581 | encoder_props.level = 9; |
582 | encoder_props.reduceSize = hunkbytes; |
583 | LzmaEncProps_Normalize(&encoder_props); |
584 | |
585 | /* convert to decoder properties */ |
586 | alloc = &lzma_codec->allocator; |
587 | lzma_allocator_init(alloc); |
588 | enc = LzmaEnc_Create((ISzAlloc*)alloc); |
589 | if (!enc) |
590 | return CHDERR_DECOMPRESSION_ERROR; |
591 | if (LzmaEnc_SetProps(enc, &encoder_props) != SZ_OK) |
592 | { |
593 | LzmaEnc_Destroy(enc, (ISzAlloc*)&alloc, (ISzAlloc*)&alloc); |
594 | return CHDERR_DECOMPRESSION_ERROR; |
595 | } |
596 | props_size = sizeof(decoder_props); |
597 | if (LzmaEnc_WriteProperties(enc, decoder_props, &props_size) != SZ_OK) |
598 | { |
599 | LzmaEnc_Destroy(enc, (ISzAlloc*)alloc, (ISzAlloc*)alloc); |
600 | return CHDERR_DECOMPRESSION_ERROR; |
601 | } |
602 | LzmaEnc_Destroy(enc, (ISzAlloc*)alloc, (ISzAlloc*)alloc); |
603 | |
604 | /* do memory allocations */ |
605 | if (LzmaDec_Allocate(&lzma_codec->decoder, decoder_props, LZMA_PROPS_SIZE, (ISzAlloc*)alloc) != SZ_OK) |
606 | return CHDERR_DECOMPRESSION_ERROR; |
607 | |
608 | /* Okay */ |
609 | return CHDERR_NONE; |
610 | } |
611 | |
612 | /*------------------------------------------------- |
613 | * lzma_codec_free |
614 | *------------------------------------------------- |
615 | */ |
616 | |
617 | static void lzma_codec_free(void* codec) |
618 | { |
619 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
620 | |
621 | /* free memory */ |
622 | LzmaDec_Free(&lzma_codec->decoder, (ISzAlloc*)&lzma_codec->allocator); |
623 | lzma_allocator_free(&lzma_codec->allocator); |
624 | } |
625 | |
626 | /*------------------------------------------------- |
627 | * decompress - decompress data using the LZMA |
628 | * codec |
629 | *------------------------------------------------- |
630 | */ |
631 | |
632 | static chd_error lzma_codec_decompress(void* codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
633 | { |
634 | ELzmaStatus status; |
635 | SRes res; |
636 | SizeT consumedlen, decodedlen; |
637 | /* initialize */ |
638 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
639 | LzmaDec_Init(&lzma_codec->decoder); |
640 | |
641 | /* decode */ |
642 | consumedlen = complen; |
643 | decodedlen = destlen; |
644 | res = LzmaDec_DecodeToBuf(&lzma_codec->decoder, dest, &decodedlen, src, &consumedlen, LZMA_FINISH_END, &status); |
645 | if ((res != SZ_OK && res != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK) || consumedlen != complen || decodedlen != destlen) |
646 | return CHDERR_DECOMPRESSION_ERROR; |
647 | return CHDERR_NONE; |
648 | } |
649 | |
650 | /* cdlz */ |
651 | static chd_error cdlz_codec_init(void* codec, uint32_t hunkbytes) |
652 | { |
653 | chd_error ret; |
654 | cdlz_codec_data* cdlz = (cdlz_codec_data*) codec; |
655 | |
656 | /* allocate buffer */ |
657 | cdlz->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
658 | if (cdlz->buffer == NULL) |
659 | return CHDERR_OUT_OF_MEMORY; |
660 | |
661 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
662 | ret = lzma_codec_init(&cdlz->base_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
663 | if (ret != CHDERR_NONE) |
664 | return ret; |
665 | |
666 | #ifdef WANT_SUBCODE |
667 | ret = zlib_codec_init(&cdlz->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SUBCODE_DATA); |
668 | if (ret != CHDERR_NONE) |
669 | return ret; |
670 | #endif |
671 | |
672 | if (hunkbytes % CD_FRAME_SIZE != 0) |
673 | return CHDERR_CODEC_ERROR; |
674 | |
675 | return CHDERR_NONE; |
676 | } |
677 | |
678 | static void cdlz_codec_free(void* codec) |
679 | { |
680 | cdlz_codec_data* cdlz = (cdlz_codec_data*) codec; |
681 | free(cdlz->buffer); |
682 | lzma_codec_free(&cdlz->base_decompressor); |
683 | #ifdef WANT_SUBCODE |
684 | zlib_codec_free(&cdlz->subcode_decompressor); |
685 | #endif |
686 | } |
687 | |
688 | static chd_error cdlz_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
689 | { |
690 | uint32_t framenum; |
691 | cdlz_codec_data* cdlz = (cdlz_codec_data*)codec; |
692 | |
693 | /* determine header bytes */ |
694 | uint32_t frames = destlen / CD_FRAME_SIZE; |
695 | uint32_t complen_bytes = (destlen < 65536) ? 2 : 3; |
696 | uint32_t ecc_bytes = (frames + 7) / 8; |
697 | uint32_t header_bytes = ecc_bytes + complen_bytes; |
698 | |
699 | /* extract compressed length of base */ |
700 | uint32_t complen_base = (src[ecc_bytes + 0] << 8) | src[ecc_bytes + 1]; |
701 | if (complen_bytes > 2) |
702 | complen_base = (complen_base << 8) | src[ecc_bytes + 2]; |
703 | |
704 | /* reset and decode */ |
705 | lzma_codec_decompress(&cdlz->base_decompressor, &src[header_bytes], complen_base, &cdlz->buffer[0], frames * CD_MAX_SECTOR_DATA); |
706 | #ifdef WANT_SUBCODE |
707 | zlib_codec_decompress(&cdlz->subcode_decompressor, &src[header_bytes + complen_base], complen - complen_base - header_bytes, &cdlz->buffer[frames * CD_MAX_SECTOR_DATA], frames * CD_MAX_SUBCODE_DATA); |
708 | #endif |
709 | |
710 | /* reassemble the data */ |
711 | for (framenum = 0; framenum < frames; framenum++) |
712 | { |
713 | uint8_t *sector; |
714 | |
715 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdlz->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
716 | #ifdef WANT_SUBCODE |
717 | memcpy(&dest[framenum * CD_FRAME_SIZE + CD_MAX_SECTOR_DATA], &cdlz->buffer[frames * CD_MAX_SECTOR_DATA + framenum * CD_MAX_SUBCODE_DATA], CD_MAX_SUBCODE_DATA); |
718 | #endif |
719 | |
720 | #ifdef WANT_RAW_DATA_SECTOR |
721 | /* reconstitute the ECC data and sync header */ |
722 | sector = (uint8_t *)&dest[framenum * CD_FRAME_SIZE]; |
723 | if ((src[framenum / 8] & (1 << (framenum % 8))) != 0) |
724 | { |
725 | memcpy(sector, s_cd_sync_header, sizeof(s_cd_sync_header)); |
726 | ecc_generate(sector); |
727 | } |
728 | #endif |
729 | } |
730 | return CHDERR_NONE; |
731 | } |
732 | |
733 | /* cdzl */ |
734 | |
735 | static chd_error cdzl_codec_init(void *codec, uint32_t hunkbytes) |
736 | { |
737 | chd_error ret; |
738 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
739 | |
740 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
741 | if (hunkbytes % CD_FRAME_SIZE != 0) |
742 | return CHDERR_CODEC_ERROR; |
743 | |
744 | cdzl->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
745 | if (cdzl->buffer == NULL) |
746 | return CHDERR_OUT_OF_MEMORY; |
747 | |
748 | ret = zlib_codec_init(&cdzl->base_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
749 | if (ret != CHDERR_NONE) |
750 | return ret; |
751 | |
752 | #ifdef WANT_SUBCODE |
753 | ret = zlib_codec_init(&cdzl->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SUBCODE_DATA); |
754 | if (ret != CHDERR_NONE) |
755 | return ret; |
756 | #endif |
757 | |
758 | return CHDERR_NONE; |
759 | } |
760 | |
761 | static void cdzl_codec_free(void *codec) |
762 | { |
763 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
764 | zlib_codec_free(&cdzl->base_decompressor); |
765 | #ifdef WANT_SUBCODE |
766 | zlib_codec_free(&cdzl->subcode_decompressor); |
767 | #endif |
768 | free(cdzl->buffer); |
769 | } |
770 | |
771 | static chd_error cdzl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
772 | { |
773 | uint32_t framenum; |
774 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
775 | |
776 | /* determine header bytes */ |
777 | uint32_t frames = destlen / CD_FRAME_SIZE; |
778 | uint32_t complen_bytes = (destlen < 65536) ? 2 : 3; |
779 | uint32_t ecc_bytes = (frames + 7) / 8; |
780 | uint32_t header_bytes = ecc_bytes + complen_bytes; |
781 | |
782 | /* extract compressed length of base */ |
783 | uint32_t complen_base = (src[ecc_bytes + 0] << 8) | src[ecc_bytes + 1]; |
784 | if (complen_bytes > 2) |
785 | complen_base = (complen_base << 8) | src[ecc_bytes + 2]; |
786 | |
787 | /* reset and decode */ |
788 | zlib_codec_decompress(&cdzl->base_decompressor, &src[header_bytes], complen_base, &cdzl->buffer[0], frames * CD_MAX_SECTOR_DATA); |
789 | #ifdef WANT_SUBCODE |
790 | zlib_codec_decompress(&cdzl->subcode_decompressor, &src[header_bytes + complen_base], complen - complen_base - header_bytes, &cdzl->buffer[frames * CD_MAX_SECTOR_DATA], frames * CD_MAX_SUBCODE_DATA); |
791 | #endif |
792 | |
793 | /* reassemble the data */ |
794 | for (framenum = 0; framenum < frames; framenum++) |
795 | { |
796 | uint8_t *sector; |
797 | |
798 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdzl->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
799 | #ifdef WANT_SUBCODE |
800 | memcpy(&dest[framenum * CD_FRAME_SIZE + CD_MAX_SECTOR_DATA], &cdzl->buffer[frames * CD_MAX_SECTOR_DATA + framenum * CD_MAX_SUBCODE_DATA], CD_MAX_SUBCODE_DATA); |
801 | #endif |
802 | |
803 | #ifdef WANT_RAW_DATA_SECTOR |
804 | /* reconstitute the ECC data and sync header */ |
805 | sector = (uint8_t *)&dest[framenum * CD_FRAME_SIZE]; |
806 | if ((src[framenum / 8] & (1 << (framenum % 8))) != 0) |
807 | { |
808 | memcpy(sector, s_cd_sync_header, sizeof(s_cd_sync_header)); |
809 | ecc_generate(sector); |
810 | } |
811 | #endif |
812 | } |
813 | return CHDERR_NONE; |
814 | } |
815 | |
9e052883 |
816 | /*************************************************************************** |
817 | * HUFFMAN DECOMPRESSOR |
818 | *************************************************************************** |
819 | */ |
820 | |
821 | static chd_error huff_codec_init(void* codec, uint32_t hunkbytes) |
822 | { |
823 | huff_codec_data* huff_codec = (huff_codec_data*) codec; |
824 | huff_codec->decoder = create_huffman_decoder(256, 16); |
825 | return CHDERR_NONE; |
826 | } |
827 | |
828 | static void huff_codec_free(void *codec) |
829 | { |
830 | huff_codec_data* huff_codec = (huff_codec_data*) codec; |
831 | delete_huffman_decoder(huff_codec->decoder); |
832 | } |
833 | |
834 | static chd_error huff_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
835 | { |
836 | huff_codec_data* huff_codec = (huff_codec_data*) codec; |
837 | struct bitstream* bitbuf = create_bitstream(src, complen); |
838 | |
839 | // first import the tree |
840 | enum huffman_error err = huffman_import_tree_huffman(huff_codec->decoder, bitbuf); |
841 | if (err != HUFFERR_NONE) |
842 | { |
843 | free(bitbuf); |
648db22b |
844 | return CHDERR_DECOMPRESSION_ERROR; |
9e052883 |
845 | } |
846 | |
847 | // then decode the data |
648db22b |
848 | uint32_t cur; |
849 | for (cur = 0; cur < destlen; cur++) |
9e052883 |
850 | dest[cur] = huffman_decode_one(huff_codec->decoder, bitbuf); |
851 | bitstream_flush(bitbuf); |
852 | chd_error result = bitstream_overflow(bitbuf) ? CHDERR_DECOMPRESSION_ERROR : CHDERR_NONE; |
853 | |
854 | free(bitbuf); |
855 | return result; |
856 | } |
857 | |
b24e7fce |
858 | /*************************************************************************** |
859 | * CD FLAC DECOMPRESSOR |
860 | *************************************************************************** |
861 | */ |
862 | |
863 | /*------------------------------------------------------ |
9e052883 |
864 | * flac_codec_blocksize - return the optimal block size |
b24e7fce |
865 | *------------------------------------------------------ |
866 | */ |
867 | |
9e052883 |
868 | static uint32_t flac_codec_blocksize(uint32_t bytes) |
b24e7fce |
869 | { |
870 | /* determine FLAC block size, which must be 16-65535 |
871 | * clamp to 2k since that's supposed to be the sweet spot */ |
9e052883 |
872 | uint32_t blocksize = bytes / 4; |
873 | while (blocksize > 2048) |
874 | blocksize /= 2; |
875 | return blocksize; |
876 | } |
877 | |
878 | static chd_error flac_codec_init(void *codec, uint32_t hunkbytes) |
879 | { |
880 | uint16_t native_endian = 0; |
881 | flac_codec_data *flac = (flac_codec_data*)codec; |
882 | |
883 | /* make sure the CHD's hunk size is an even multiple of the sample size */ |
884 | if (hunkbytes % 4 != 0) |
885 | return CHDERR_CODEC_ERROR; |
886 | |
887 | /* determine whether we want native or swapped samples */ |
888 | *(uint8_t *)(&native_endian) = 1; |
889 | flac->native_endian = (native_endian & 1); |
890 | |
891 | /* flac decoder init */ |
892 | if (flac_decoder_init(&flac->decoder)) |
893 | return CHDERR_OUT_OF_MEMORY; |
894 | |
895 | return CHDERR_NONE; |
896 | } |
897 | |
898 | static void flac_codec_free(void *codec) |
899 | { |
900 | flac_codec_data *flac = (flac_codec_data*)codec; |
901 | flac_decoder_free(&flac->decoder); |
902 | } |
903 | |
904 | static chd_error flac_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
905 | { |
906 | flac_codec_data *flac = (flac_codec_data*)codec; |
907 | int swap_endian; |
908 | |
909 | if (src[0] == 'L') |
910 | swap_endian = !flac->native_endian; |
911 | else if (src[0] == 'B') |
912 | swap_endian = flac->native_endian; |
913 | else |
914 | return CHDERR_DECOMPRESSION_ERROR; |
915 | |
916 | if (!flac_decoder_reset(&flac->decoder, 44100, 2, flac_codec_blocksize(destlen), src + 1, complen - 1)) |
917 | return CHDERR_DECOMPRESSION_ERROR; |
918 | if (!flac_decoder_decode_interleaved(&flac->decoder, (int16_t *)(dest), destlen/4, swap_endian)) |
919 | return CHDERR_DECOMPRESSION_ERROR; |
920 | flac_decoder_finish(&flac->decoder); |
921 | |
922 | return CHDERR_NONE; |
923 | } |
924 | |
925 | static uint32_t cdfl_codec_blocksize(uint32_t bytes) |
926 | { |
927 | // for CDs it seems that CD_MAX_SECTOR_DATA is the right target |
928 | uint32_t blocksize = bytes / 4; |
929 | while (blocksize > CD_MAX_SECTOR_DATA) |
930 | blocksize /= 2; |
931 | return blocksize; |
b24e7fce |
932 | } |
933 | |
934 | static chd_error cdfl_codec_init(void *codec, uint32_t hunkbytes) |
935 | { |
936 | #ifdef WANT_SUBCODE |
937 | chd_error ret; |
938 | #endif |
939 | uint16_t native_endian = 0; |
940 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
941 | |
942 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
943 | if (hunkbytes % CD_FRAME_SIZE != 0) |
944 | return CHDERR_CODEC_ERROR; |
945 | |
946 | cdfl->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
947 | if (cdfl->buffer == NULL) |
948 | return CHDERR_OUT_OF_MEMORY; |
949 | |
950 | /* determine whether we want native or swapped samples */ |
951 | *(uint8_t *)(&native_endian) = 1; |
952 | cdfl->swap_endian = (native_endian & 1); |
953 | |
954 | #ifdef WANT_SUBCODE |
955 | /* init zlib inflater */ |
956 | ret = zlib_codec_init(&cdfl->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
957 | if (ret != CHDERR_NONE) |
958 | return ret; |
959 | #endif |
960 | |
961 | /* flac decoder init */ |
962 | if (flac_decoder_init(&cdfl->decoder)) |
963 | return CHDERR_OUT_OF_MEMORY; |
964 | |
965 | return CHDERR_NONE; |
966 | } |
967 | |
968 | static void cdfl_codec_free(void *codec) |
969 | { |
970 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
971 | flac_decoder_free(&cdfl->decoder); |
972 | #ifdef WANT_SUBCODE |
973 | zlib_codec_free(&cdfl->subcode_decompressor); |
974 | #endif |
975 | if (cdfl->buffer) |
976 | free(cdfl->buffer); |
977 | } |
978 | |
979 | static chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
980 | { |
981 | uint32_t framenum; |
982 | uint8_t *buffer; |
983 | #ifdef WANT_SUBCODE |
984 | uint32_t offset; |
985 | chd_error ret; |
986 | #endif |
987 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
988 | |
989 | /* reset and decode */ |
990 | uint32_t frames = destlen / CD_FRAME_SIZE; |
991 | |
992 | if (!flac_decoder_reset(&cdfl->decoder, 44100, 2, cdfl_codec_blocksize(frames * CD_MAX_SECTOR_DATA), src, complen)) |
993 | return CHDERR_DECOMPRESSION_ERROR; |
994 | buffer = &cdfl->buffer[0]; |
995 | if (!flac_decoder_decode_interleaved(&cdfl->decoder, (int16_t *)(buffer), frames * CD_MAX_SECTOR_DATA/4, cdfl->swap_endian)) |
996 | return CHDERR_DECOMPRESSION_ERROR; |
997 | |
998 | #ifdef WANT_SUBCODE |
999 | /* inflate the subcode data */ |
1000 | offset = flac_decoder_finish(&cdfl->decoder); |
1001 | ret = zlib_codec_decompress(&cdfl->subcode_decompressor, src + offset, complen - offset, &cdfl->buffer[frames * CD_MAX_SECTOR_DATA], frames * CD_MAX_SUBCODE_DATA); |
1002 | if (ret != CHDERR_NONE) |
1003 | return ret; |
1004 | #else |
1005 | flac_decoder_finish(&cdfl->decoder); |
1006 | #endif |
1007 | |
1008 | /* reassemble the data */ |
1009 | for (framenum = 0; framenum < frames; framenum++) |
1010 | { |
1011 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdfl->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
1012 | #ifdef WANT_SUBCODE |
1013 | memcpy(&dest[framenum * CD_FRAME_SIZE + CD_MAX_SECTOR_DATA], &cdfl->buffer[frames * CD_MAX_SECTOR_DATA + framenum * CD_MAX_SUBCODE_DATA], CD_MAX_SUBCODE_DATA); |
1014 | #endif |
1015 | } |
1016 | |
1017 | return CHDERR_NONE; |
1018 | } |
648db22b |
1019 | |
1020 | |
1021 | /*************************************************************************** |
1022 | * ZSTD DECOMPRESSOR |
1023 | *************************************************************************** |
1024 | */ |
1025 | |
1026 | /*------------------------------------------------- |
1027 | * zstd_codec_init - constructor |
1028 | *------------------------------------------------- |
1029 | */ |
1030 | |
1031 | static chd_error zstd_codec_init(void* codec, uint32_t hunkbytes) |
1032 | { |
1033 | zstd_codec_data* zstd_codec = (zstd_codec_data*) codec; |
1034 | |
1035 | zstd_codec->dstream = ZSTD_createDStream(); |
1036 | if (!zstd_codec->dstream) { |
1037 | printf("NO DSTREAM CREATED!\n"); |
1038 | return CHDERR_DECOMPRESSION_ERROR; |
1039 | } |
1040 | return CHDERR_NONE; |
1041 | } |
1042 | |
1043 | /*------------------------------------------------- |
1044 | * zstd_codec_free |
1045 | *------------------------------------------------- |
1046 | */ |
1047 | |
1048 | static void zstd_codec_free(void* codec) |
1049 | { |
1050 | zstd_codec_data* zstd_codec = (zstd_codec_data*) codec; |
1051 | |
1052 | ZSTD_freeDStream(zstd_codec->dstream); |
1053 | } |
1054 | |
1055 | /*------------------------------------------------- |
1056 | * decompress - decompress data using the ZSTD |
1057 | * codec |
1058 | *------------------------------------------------- |
1059 | */ |
1060 | static chd_error zstd_codec_decompress(void* codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
1061 | { |
1062 | /* initialize */ |
1063 | zstd_codec_data* zstd_codec = (zstd_codec_data*) codec; |
1064 | //reset decompressor |
1065 | size_t zstd_res = ZSTD_initDStream(zstd_codec->dstream); |
1066 | if (ZSTD_isError(zstd_res)) |
1067 | { |
1068 | printf("INITI DSTREAM FAILED!\n"); |
1069 | return CHDERR_DECOMPRESSION_ERROR; |
1070 | } |
1071 | |
1072 | ZSTD_inBuffer input = {src, complen, 0}; |
1073 | ZSTD_outBuffer output = {dest, destlen, 0 }; |
1074 | |
1075 | while ((input.pos < input.size) && (output.pos < output.size)) |
1076 | { |
1077 | zstd_res = ZSTD_decompressStream(zstd_codec->dstream, &output, &input); |
1078 | if (ZSTD_isError(zstd_res)) |
1079 | { |
1080 | printf("DECOMPRESSION ERROR IN LOOP\n"); |
1081 | return CHDERR_DECOMPRESSION_ERROR; |
1082 | } |
1083 | } |
1084 | if (output.pos != output.size) |
1085 | { |
1086 | printf("OUTPUT DOESN'T MATCH!\n"); |
1087 | return CHDERR_DECOMPRESSION_ERROR; |
1088 | } |
1089 | return CHDERR_NONE; |
1090 | |
1091 | } |
1092 | |
1093 | /* cdzs */ |
1094 | static chd_error cdzs_codec_init(void* codec, uint32_t hunkbytes) |
1095 | { |
1096 | chd_error ret; |
1097 | cdzs_codec_data* cdzs = (cdzs_codec_data*) codec; |
1098 | |
1099 | /* allocate buffer */ |
1100 | cdzs->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
1101 | if (cdzs->buffer == NULL) |
1102 | return CHDERR_OUT_OF_MEMORY; |
1103 | |
1104 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
1105 | ret = zstd_codec_init(&cdzs->base_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
1106 | if (ret != CHDERR_NONE) |
1107 | return ret; |
1108 | |
1109 | #ifdef WANT_SUBCODE |
1110 | ret = zstd_codec_init(&cdzs->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SUBCODE_DATA); |
1111 | if (ret != CHDERR_NONE) |
1112 | return ret; |
1113 | #endif |
1114 | |
1115 | if (hunkbytes % CD_FRAME_SIZE != 0) |
1116 | return CHDERR_CODEC_ERROR; |
1117 | |
1118 | return CHDERR_NONE; |
1119 | } |
1120 | |
1121 | static void cdzs_codec_free(void* codec) |
1122 | { |
1123 | cdzs_codec_data* cdzs = (cdzs_codec_data*) codec; |
1124 | free(cdzs->buffer); |
1125 | zstd_codec_free(&cdzs->base_decompressor); |
1126 | #ifdef WANT_SUBCODE |
1127 | zstd_codec_free(&cdzs->subcode_decompressor); |
1128 | #endif |
1129 | } |
1130 | |
1131 | static chd_error cdzs_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
1132 | { |
1133 | uint32_t framenum; |
1134 | cdzs_codec_data* cdzs = (cdzs_codec_data*)codec; |
1135 | |
1136 | /* determine header bytes */ |
1137 | uint32_t frames = destlen / CD_FRAME_SIZE; |
1138 | uint32_t complen_bytes = (destlen < 65536) ? 2 : 3; |
1139 | uint32_t ecc_bytes = (frames + 7) / 8; |
1140 | uint32_t header_bytes = ecc_bytes + complen_bytes; |
1141 | |
1142 | /* extract compressed length of base */ |
1143 | uint32_t complen_base = (src[ecc_bytes + 0] << 8) | src[ecc_bytes + 1]; |
1144 | if (complen_bytes > 2) |
1145 | complen_base = (complen_base << 8) | src[ecc_bytes + 2]; |
1146 | |
1147 | /* reset and decode */ |
1148 | zstd_codec_decompress(&cdzs->base_decompressor, &src[header_bytes], complen_base, &cdzs->buffer[0], frames * CD_MAX_SECTOR_DATA); |
1149 | #ifdef WANT_SUBCODE |
1150 | zstd_codec_decompress(&cdzs->subcode_decompressor, &src[header_bytes + complen_base], complen - complen_base - header_bytes, &cdzs->buffer[frames * CD_MAX_SECTOR_DATA], frames * CD_MAX_SUBCODE_DATA); |
1151 | #endif |
1152 | |
1153 | /* reassemble the data */ |
1154 | for (framenum = 0; framenum < frames; framenum++) |
1155 | { |
1156 | uint8_t *sector; |
1157 | |
1158 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdzs->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
1159 | #ifdef WANT_SUBCODE |
1160 | memcpy(&dest[framenum * CD_FRAME_SIZE + CD_MAX_SECTOR_DATA], &cdzs->buffer[frames * CD_MAX_SECTOR_DATA + framenum * CD_MAX_SUBCODE_DATA], CD_MAX_SUBCODE_DATA); |
1161 | #endif |
1162 | |
1163 | #ifdef WANT_RAW_DATA_SECTOR |
1164 | /* reconstitute the ECC data and sync header */ |
1165 | sector = (uint8_t *)&dest[framenum * CD_FRAME_SIZE]; |
1166 | if ((src[framenum / 8] & (1 << (framenum % 8))) != 0) |
1167 | { |
1168 | memcpy(sector, s_cd_sync_header, sizeof(s_cd_sync_header)); |
1169 | ecc_generate(sector); |
1170 | } |
1171 | #endif |
1172 | } |
1173 | return CHDERR_NONE; |
1174 | } |
1175 | |
b24e7fce |
1176 | /*************************************************************************** |
1177 | CODEC INTERFACES |
1178 | ***************************************************************************/ |
1179 | |
1180 | static const codec_interface codec_interfaces[] = |
1181 | { |
1182 | /* "none" or no compression */ |
1183 | { |
1184 | CHDCOMPRESSION_NONE, |
1185 | "none", |
1186 | FALSE, |
1187 | NULL, |
1188 | NULL, |
1189 | NULL, |
1190 | NULL |
1191 | }, |
1192 | |
1193 | /* standard zlib compression */ |
1194 | { |
1195 | CHDCOMPRESSION_ZLIB, |
1196 | "zlib", |
1197 | FALSE, |
1198 | zlib_codec_init, |
1199 | zlib_codec_free, |
1200 | zlib_codec_decompress, |
1201 | NULL |
1202 | }, |
1203 | |
1204 | /* zlib+ compression */ |
1205 | { |
1206 | CHDCOMPRESSION_ZLIB_PLUS, |
1207 | "zlib+", |
1208 | FALSE, |
1209 | zlib_codec_init, |
1210 | zlib_codec_free, |
1211 | zlib_codec_decompress, |
1212 | NULL |
1213 | }, |
1214 | |
1215 | /* V5 zlib compression */ |
1216 | { |
1217 | CHD_CODEC_ZLIB, |
1218 | "zlib (Deflate)", |
1219 | FALSE, |
1220 | zlib_codec_init, |
1221 | zlib_codec_free, |
1222 | zlib_codec_decompress, |
1223 | NULL |
1224 | }, |
1225 | |
9e052883 |
1226 | /* V5 lzma compression */ |
1227 | { |
1228 | CHD_CODEC_LZMA, |
1229 | "lzma (LZMA)", |
1230 | FALSE, |
1231 | lzma_codec_init, |
1232 | lzma_codec_free, |
1233 | lzma_codec_decompress, |
1234 | NULL |
1235 | }, |
1236 | |
1237 | /* V5 huffman compression */ |
1238 | { |
1239 | CHD_CODEC_HUFFMAN, |
1240 | "Huffman", |
1241 | FALSE, |
1242 | huff_codec_init, |
1243 | huff_codec_free, |
1244 | huff_codec_decompress, |
1245 | NULL |
1246 | }, |
1247 | |
1248 | /* V5 flac compression */ |
1249 | { |
1250 | CHD_CODEC_FLAC, |
1251 | "flac (FLAC)", |
1252 | FALSE, |
1253 | flac_codec_init, |
1254 | flac_codec_free, |
1255 | flac_codec_decompress, |
1256 | NULL |
1257 | }, |
648db22b |
1258 | /* V5 zstd compression */ |
1259 | { |
1260 | CHD_CODEC_ZSTD, |
1261 | "ZStandard", |
1262 | FALSE, |
1263 | zstd_codec_init, |
1264 | zstd_codec_free, |
1265 | zstd_codec_decompress, |
1266 | NULL |
1267 | }, |
9e052883 |
1268 | |
b24e7fce |
1269 | /* V5 CD zlib compression */ |
1270 | { |
1271 | CHD_CODEC_CD_ZLIB, |
1272 | "cdzl (CD Deflate)", |
1273 | FALSE, |
1274 | cdzl_codec_init, |
1275 | cdzl_codec_free, |
1276 | cdzl_codec_decompress, |
1277 | NULL |
1278 | }, |
1279 | |
1280 | /* V5 CD lzma compression */ |
1281 | { |
1282 | CHD_CODEC_CD_LZMA, |
1283 | "cdlz (CD LZMA)", |
1284 | FALSE, |
1285 | cdlz_codec_init, |
1286 | cdlz_codec_free, |
1287 | cdlz_codec_decompress, |
1288 | NULL |
1289 | }, |
1290 | |
1291 | /* V5 CD flac compression */ |
1292 | { |
1293 | CHD_CODEC_CD_FLAC, |
1294 | "cdfl (CD FLAC)", |
1295 | FALSE, |
1296 | cdfl_codec_init, |
1297 | cdfl_codec_free, |
1298 | cdfl_codec_decompress, |
1299 | NULL |
1300 | }, |
648db22b |
1301 | /* V5 CD zstd compression */ |
1302 | { |
1303 | CHD_CODEC_CD_ZSTD, |
1304 | "cdzs (CD ZStandard)", |
1305 | FALSE, |
1306 | cdzs_codec_init, |
1307 | cdzs_codec_free, |
1308 | cdzs_codec_decompress, |
1309 | NULL |
1310 | } |
1311 | |
b24e7fce |
1312 | }; |
1313 | |
1314 | /*************************************************************************** |
1315 | INLINE FUNCTIONS |
1316 | ***************************************************************************/ |
1317 | |
1318 | /*------------------------------------------------- |
1319 | get_bigendian_uint64 - fetch a UINT64 from |
1320 | the data stream in bigendian order |
1321 | -------------------------------------------------*/ |
1322 | |
1323 | static inline UINT64 get_bigendian_uint64(const UINT8 *base) |
1324 | { |
1325 | return ((UINT64)base[0] << 56) | ((UINT64)base[1] << 48) | ((UINT64)base[2] << 40) | ((UINT64)base[3] << 32) | |
1326 | ((UINT64)base[4] << 24) | ((UINT64)base[5] << 16) | ((UINT64)base[6] << 8) | (UINT64)base[7]; |
1327 | } |
1328 | |
1329 | /*------------------------------------------------- |
1330 | put_bigendian_uint64 - write a UINT64 to |
1331 | the data stream in bigendian order |
1332 | -------------------------------------------------*/ |
1333 | |
1334 | static inline void put_bigendian_uint64(UINT8 *base, UINT64 value) |
1335 | { |
1336 | base[0] = value >> 56; |
1337 | base[1] = value >> 48; |
1338 | base[2] = value >> 40; |
1339 | base[3] = value >> 32; |
1340 | base[4] = value >> 24; |
1341 | base[5] = value >> 16; |
1342 | base[6] = value >> 8; |
1343 | base[7] = value; |
1344 | } |
1345 | |
1346 | /*------------------------------------------------- |
1347 | get_bigendian_uint48 - fetch a UINT48 from |
1348 | the data stream in bigendian order |
1349 | -------------------------------------------------*/ |
1350 | |
1351 | static inline UINT64 get_bigendian_uint48(const UINT8 *base) |
1352 | { |
1353 | return ((UINT64)base[0] << 40) | ((UINT64)base[1] << 32) | |
1354 | ((UINT64)base[2] << 24) | ((UINT64)base[3] << 16) | ((UINT64)base[4] << 8) | (UINT64)base[5]; |
1355 | } |
1356 | |
1357 | /*------------------------------------------------- |
1358 | put_bigendian_uint48 - write a UINT48 to |
1359 | the data stream in bigendian order |
1360 | -------------------------------------------------*/ |
1361 | |
1362 | static inline void put_bigendian_uint48(UINT8 *base, UINT64 value) |
1363 | { |
1364 | value &= 0xffffffffffff; |
1365 | base[0] = value >> 40; |
1366 | base[1] = value >> 32; |
1367 | base[2] = value >> 24; |
1368 | base[3] = value >> 16; |
1369 | base[4] = value >> 8; |
1370 | base[5] = value; |
1371 | } |
1372 | /*------------------------------------------------- |
1373 | get_bigendian_uint32 - fetch a UINT32 from |
1374 | the data stream in bigendian order |
1375 | -------------------------------------------------*/ |
1376 | |
1377 | static inline UINT32 get_bigendian_uint32(const UINT8 *base) |
1378 | { |
1379 | return (base[0] << 24) | (base[1] << 16) | (base[2] << 8) | base[3]; |
1380 | } |
1381 | |
1382 | /*------------------------------------------------- |
1383 | put_bigendian_uint32 - write a UINT32 to |
1384 | the data stream in bigendian order |
1385 | -------------------------------------------------*/ |
1386 | |
1387 | static inline void put_bigendian_uint32(UINT8 *base, UINT32 value) |
1388 | { |
1389 | base[0] = value >> 24; |
1390 | base[1] = value >> 16; |
1391 | base[2] = value >> 8; |
1392 | base[3] = value; |
1393 | } |
1394 | |
1395 | /*------------------------------------------------- |
1396 | put_bigendian_uint24 - write a UINT24 to |
1397 | the data stream in bigendian order |
1398 | -------------------------------------------------*/ |
1399 | |
1400 | static inline void put_bigendian_uint24(UINT8 *base, UINT32 value) |
1401 | { |
1402 | value &= 0xffffff; |
1403 | base[0] = value >> 16; |
1404 | base[1] = value >> 8; |
1405 | base[2] = value; |
1406 | } |
1407 | |
1408 | /*------------------------------------------------- |
1409 | get_bigendian_uint24 - fetch a UINT24 from |
1410 | the data stream in bigendian order |
1411 | -------------------------------------------------*/ |
1412 | |
1413 | static inline UINT32 get_bigendian_uint24(const UINT8 *base) |
1414 | { |
1415 | return (base[0] << 16) | (base[1] << 8) | base[2]; |
1416 | } |
1417 | |
1418 | /*------------------------------------------------- |
1419 | get_bigendian_uint16 - fetch a UINT16 from |
1420 | the data stream in bigendian order |
1421 | -------------------------------------------------*/ |
1422 | |
1423 | static inline UINT16 get_bigendian_uint16(const UINT8 *base) |
1424 | { |
1425 | return (base[0] << 8) | base[1]; |
1426 | } |
1427 | |
1428 | /*------------------------------------------------- |
1429 | put_bigendian_uint16 - write a UINT16 to |
1430 | the data stream in bigendian order |
1431 | -------------------------------------------------*/ |
1432 | |
1433 | static inline void put_bigendian_uint16(UINT8 *base, UINT16 value) |
1434 | { |
1435 | base[0] = value >> 8; |
1436 | base[1] = value; |
1437 | } |
1438 | |
1439 | /*------------------------------------------------- |
1440 | map_extract - extract a single map |
1441 | entry from the datastream |
1442 | -------------------------------------------------*/ |
1443 | |
1444 | static inline void map_extract(const UINT8 *base, map_entry *entry) |
1445 | { |
1446 | entry->offset = get_bigendian_uint64(&base[0]); |
1447 | entry->crc = get_bigendian_uint32(&base[8]); |
1448 | entry->length = get_bigendian_uint16(&base[12]) | (base[14] << 16); |
1449 | entry->flags = base[15]; |
1450 | } |
1451 | |
1452 | /*------------------------------------------------- |
1453 | map_assemble - write a single map |
1454 | entry to the datastream |
1455 | -------------------------------------------------*/ |
1456 | |
1457 | static inline void map_assemble(UINT8 *base, map_entry *entry) |
1458 | { |
1459 | put_bigendian_uint64(&base[0], entry->offset); |
1460 | put_bigendian_uint32(&base[8], entry->crc); |
1461 | put_bigendian_uint16(&base[12], entry->length); |
1462 | base[14] = entry->length >> 16; |
1463 | base[15] = entry->flags; |
1464 | } |
1465 | |
1466 | /*------------------------------------------------- |
1467 | map_size_v5 - calculate CHDv5 map size |
1468 | -------------------------------------------------*/ |
1469 | static inline int map_size_v5(chd_header* header) |
1470 | { |
1471 | return header->hunkcount * header->mapentrybytes; |
1472 | } |
1473 | |
1474 | /*------------------------------------------------- |
1475 | crc16 - calculate CRC16 (from hashing.cpp) |
1476 | -------------------------------------------------*/ |
1477 | uint16_t crc16(const void *data, uint32_t length) |
1478 | { |
1479 | uint16_t crc = 0xffff; |
1480 | |
1481 | static const uint16_t s_table[256] = |
1482 | { |
1483 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, |
1484 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, |
1485 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, |
1486 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, |
1487 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, |
1488 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, |
1489 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, |
1490 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, |
1491 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
1492 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, |
1493 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, |
1494 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, |
1495 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, |
1496 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, |
1497 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, |
1498 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, |
1499 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, |
1500 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
1501 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, |
1502 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, |
1503 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, |
1504 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
1505 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, |
1506 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, |
1507 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, |
1508 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, |
1509 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
1510 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, |
1511 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, |
1512 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, |
1513 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, |
1514 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 |
1515 | }; |
1516 | |
1517 | const uint8_t *src = (uint8_t*)data; |
1518 | |
1519 | /* fetch the current value into a local and rip through the source data */ |
1520 | while (length-- != 0) |
1521 | crc = (crc << 8) ^ s_table[(crc >> 8) ^ *src++]; |
1522 | return crc; |
1523 | } |
1524 | |
1525 | /*------------------------------------------------- |
1526 | compressed - test if CHD file is compressed |
1527 | +-------------------------------------------------*/ |
1528 | static inline int chd_compressed(chd_header* header) { |
1529 | return header->compression[0] != CHD_CODEC_NONE; |
1530 | } |
1531 | |
1532 | /*------------------------------------------------- |
1533 | decompress_v5_map - decompress the v5 map |
1534 | -------------------------------------------------*/ |
1535 | |
1536 | static chd_error decompress_v5_map(chd_file* chd, chd_header* header) |
1537 | { |
1538 | int result = 0; |
9e052883 |
1539 | uint32_t hunknum; |
b24e7fce |
1540 | int repcount = 0; |
1541 | uint8_t lastcomp = 0; |
1542 | uint32_t last_self = 0; |
1543 | uint64_t last_parent = 0; |
1544 | struct bitstream* bitbuf; |
1545 | uint32_t mapbytes; |
1546 | uint64_t firstoffs; |
1547 | uint16_t mapcrc; |
1548 | uint8_t lengthbits; |
1549 | uint8_t selfbits; |
1550 | uint8_t parentbits; |
1551 | uint8_t *compressed_ptr; |
1552 | uint8_t rawbuf[16]; |
1553 | struct huffman_decoder* decoder; |
1554 | enum huffman_error err; |
1555 | uint64_t curoffset; |
1556 | int rawmapsize = map_size_v5(header); |
1557 | |
1558 | if (!chd_compressed(header)) |
1559 | { |
1560 | header->rawmap = (uint8_t*)malloc(rawmapsize); |
9e052883 |
1561 | if (header->rawmap == NULL) |
1562 | return CHDERR_OUT_OF_MEMORY; |
b24e7fce |
1563 | core_fseek(chd->file, header->mapoffset, SEEK_SET); |
1564 | result = core_fread(chd->file, header->rawmap, rawmapsize); |
1565 | return CHDERR_NONE; |
1566 | } |
1567 | |
1568 | /* read the reader */ |
1569 | core_fseek(chd->file, header->mapoffset, SEEK_SET); |
1570 | result = core_fread(chd->file, rawbuf, sizeof(rawbuf)); |
1571 | mapbytes = get_bigendian_uint32(&rawbuf[0]); |
1572 | firstoffs = get_bigendian_uint48(&rawbuf[4]); |
1573 | mapcrc = get_bigendian_uint16(&rawbuf[10]); |
1574 | lengthbits = rawbuf[12]; |
1575 | selfbits = rawbuf[13]; |
1576 | parentbits = rawbuf[14]; |
1577 | |
1578 | /* now read the map */ |
1579 | compressed_ptr = (uint8_t*)malloc(sizeof(uint8_t) * mapbytes); |
9e052883 |
1580 | if (compressed_ptr == NULL) |
1581 | return CHDERR_OUT_OF_MEMORY; |
b24e7fce |
1582 | core_fseek(chd->file, header->mapoffset + 16, SEEK_SET); |
1583 | result = core_fread(chd->file, compressed_ptr, mapbytes); |
1584 | bitbuf = create_bitstream(compressed_ptr, sizeof(uint8_t) * mapbytes); |
1585 | header->rawmap = (uint8_t*)malloc(rawmapsize); |
9e052883 |
1586 | if (header->rawmap == NULL) |
1587 | { |
1588 | free(compressed_ptr); |
1589 | free(bitbuf); |
1590 | return CHDERR_OUT_OF_MEMORY; |
1591 | } |
b24e7fce |
1592 | |
1593 | /* first decode the compression types */ |
1594 | decoder = create_huffman_decoder(16, 8); |
1595 | if (decoder == NULL) |
1596 | { |
1597 | free(compressed_ptr); |
1598 | free(bitbuf); |
1599 | return CHDERR_OUT_OF_MEMORY; |
1600 | } |
1601 | |
1602 | err = huffman_import_tree_rle(decoder, bitbuf); |
1603 | if (err != HUFFERR_NONE) |
1604 | { |
1605 | free(compressed_ptr); |
1606 | free(bitbuf); |
1607 | delete_huffman_decoder(decoder); |
1608 | return CHDERR_DECOMPRESSION_ERROR; |
1609 | } |
1610 | |
1611 | for (hunknum = 0; hunknum < header->hunkcount; hunknum++) |
1612 | { |
1613 | uint8_t *rawmap = header->rawmap + (hunknum * 12); |
1614 | if (repcount > 0) |
1615 | rawmap[0] = lastcomp, repcount--; |
1616 | else |
1617 | { |
1618 | uint8_t val = huffman_decode_one(decoder, bitbuf); |
1619 | if (val == COMPRESSION_RLE_SMALL) |
1620 | rawmap[0] = lastcomp, repcount = 2 + huffman_decode_one(decoder, bitbuf); |
1621 | else if (val == COMPRESSION_RLE_LARGE) |
1622 | rawmap[0] = lastcomp, repcount = 2 + 16 + (huffman_decode_one(decoder, bitbuf) << 4), repcount += huffman_decode_one(decoder, bitbuf); |
1623 | else |
1624 | rawmap[0] = lastcomp = val; |
1625 | } |
1626 | } |
1627 | |
1628 | /* then iterate through the hunks and extract the needed data */ |
1629 | curoffset = firstoffs; |
1630 | for (hunknum = 0; hunknum < header->hunkcount; hunknum++) |
1631 | { |
1632 | uint8_t *rawmap = header->rawmap + (hunknum * 12); |
1633 | uint64_t offset = curoffset; |
1634 | uint32_t length = 0; |
1635 | uint16_t crc = 0; |
1636 | switch (rawmap[0]) |
1637 | { |
1638 | /* base types */ |
1639 | case COMPRESSION_TYPE_0: |
1640 | case COMPRESSION_TYPE_1: |
1641 | case COMPRESSION_TYPE_2: |
1642 | case COMPRESSION_TYPE_3: |
1643 | curoffset += length = bitstream_read(bitbuf, lengthbits); |
1644 | crc = bitstream_read(bitbuf, 16); |
1645 | break; |
1646 | |
1647 | case COMPRESSION_NONE: |
1648 | curoffset += length = header->hunkbytes; |
1649 | crc = bitstream_read(bitbuf, 16); |
1650 | break; |
1651 | |
1652 | case COMPRESSION_SELF: |
1653 | last_self = offset = bitstream_read(bitbuf, selfbits); |
1654 | break; |
1655 | |
1656 | case COMPRESSION_PARENT: |
1657 | offset = bitstream_read(bitbuf, parentbits); |
1658 | last_parent = offset; |
1659 | break; |
1660 | |
1661 | /* pseudo-types; convert into base types */ |
1662 | case COMPRESSION_SELF_1: |
1663 | last_self++; |
1664 | case COMPRESSION_SELF_0: |
1665 | rawmap[0] = COMPRESSION_SELF; |
1666 | offset = last_self; |
1667 | break; |
1668 | |
1669 | case COMPRESSION_PARENT_SELF: |
1670 | rawmap[0] = COMPRESSION_PARENT; |
1671 | last_parent = offset = ( ((uint64_t)hunknum) * ((uint64_t)header->hunkbytes) ) / header->unitbytes; |
1672 | break; |
1673 | |
1674 | case COMPRESSION_PARENT_1: |
1675 | last_parent += header->hunkbytes / header->unitbytes; |
1676 | case COMPRESSION_PARENT_0: |
1677 | rawmap[0] = COMPRESSION_PARENT; |
1678 | offset = last_parent; |
1679 | break; |
1680 | } |
1681 | /* UINT24 length */ |
1682 | put_bigendian_uint24(&rawmap[1], length); |
1683 | |
1684 | /* UINT48 offset */ |
1685 | put_bigendian_uint48(&rawmap[4], offset); |
1686 | |
1687 | /* crc16 */ |
1688 | put_bigendian_uint16(&rawmap[10], crc); |
1689 | } |
1690 | |
1691 | /* free memory */ |
1692 | free(compressed_ptr); |
1693 | free(bitbuf); |
1694 | delete_huffman_decoder(decoder); |
1695 | |
1696 | /* verify the final CRC */ |
1697 | if (crc16(&header->rawmap[0], header->hunkcount * 12) != mapcrc) |
1698 | return CHDERR_DECOMPRESSION_ERROR; |
1699 | |
1700 | return CHDERR_NONE; |
1701 | } |
1702 | |
1703 | /*------------------------------------------------- |
1704 | map_extract_old - extract a single map |
1705 | entry in old format from the datastream |
1706 | -------------------------------------------------*/ |
1707 | |
1708 | static inline void map_extract_old(const UINT8 *base, map_entry *entry, UINT32 hunkbytes) |
1709 | { |
1710 | entry->offset = get_bigendian_uint64(&base[0]); |
1711 | entry->crc = 0; |
1712 | entry->length = entry->offset >> 44; |
1713 | entry->flags = MAP_ENTRY_FLAG_NO_CRC | ((entry->length == hunkbytes) ? V34_MAP_ENTRY_TYPE_UNCOMPRESSED : V34_MAP_ENTRY_TYPE_COMPRESSED); |
1714 | #ifdef __MWERKS__ |
1715 | entry->offset = entry->offset & 0x00000FFFFFFFFFFFLL; |
1716 | #else |
1717 | entry->offset = (entry->offset << 20) >> 20; |
1718 | #endif |
1719 | } |
1720 | |
1721 | /*************************************************************************** |
1722 | CHD FILE MANAGEMENT |
1723 | ***************************************************************************/ |
1724 | |
1725 | /*------------------------------------------------- |
1726 | chd_open_file - open a CHD file for access |
1727 | -------------------------------------------------*/ |
1728 | |
9e052883 |
1729 | CHD_EXPORT chd_error chd_open_file(FILE *file, int mode, chd_file *parent, chd_file **chd) { |
1730 | core_file *stream = malloc(sizeof(core_file)); |
1731 | if (!stream) |
1732 | return CHDERR_OUT_OF_MEMORY; |
1733 | stream->argp = file; |
1734 | stream->fsize = core_stdio_fsize; |
1735 | stream->fread = core_stdio_fread; |
1736 | stream->fclose = core_stdio_fclose_nonowner; |
1737 | stream->fseek = core_stdio_fseek; |
1738 | |
1739 | return chd_open_core_file(stream, mode, parent, chd); |
1740 | } |
1741 | |
1742 | /*------------------------------------------------- |
1743 | chd_open_core_file - open a CHD file for access |
1744 | -------------------------------------------------*/ |
1745 | |
1746 | CHD_EXPORT chd_error chd_open_core_file(core_file *file, int mode, chd_file *parent, chd_file **chd) |
b24e7fce |
1747 | { |
1748 | chd_file *newchd = NULL; |
1749 | chd_error err; |
1750 | int intfnum; |
1751 | |
1752 | /* verify parameters */ |
1753 | if (file == NULL) |
1754 | EARLY_EXIT(err = CHDERR_INVALID_PARAMETER); |
1755 | |
1756 | /* punt if invalid parent */ |
1757 | if (parent != NULL && parent->cookie != COOKIE_VALUE) |
1758 | EARLY_EXIT(err = CHDERR_INVALID_PARAMETER); |
1759 | |
1760 | /* allocate memory for the final result */ |
1761 | newchd = (chd_file *)malloc(sizeof(**chd)); |
1762 | if (newchd == NULL) |
1763 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
1764 | memset(newchd, 0, sizeof(*newchd)); |
1765 | newchd->cookie = COOKIE_VALUE; |
1766 | newchd->parent = parent; |
1767 | newchd->file = file; |
1768 | |
1769 | /* now attempt to read the header */ |
1770 | err = header_read(newchd, &newchd->header); |
1771 | if (err != CHDERR_NONE) |
1772 | EARLY_EXIT(err); |
1773 | |
1774 | /* validate the header */ |
1775 | err = header_validate(&newchd->header); |
1776 | if (err != CHDERR_NONE) |
1777 | EARLY_EXIT(err); |
1778 | |
1779 | /* make sure we don't open a read-only file writeable */ |
1780 | if (mode == CHD_OPEN_READWRITE && !(newchd->header.flags & CHDFLAGS_IS_WRITEABLE)) |
1781 | EARLY_EXIT(err = CHDERR_FILE_NOT_WRITEABLE); |
1782 | |
1783 | /* also, never open an older version writeable */ |
1784 | if (mode == CHD_OPEN_READWRITE && newchd->header.version < CHD_HEADER_VERSION) |
1785 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_VERSION); |
1786 | |
1787 | /* if we need a parent, make sure we have one */ |
1788 | if (parent == NULL) |
1789 | { |
1790 | /* Detect parent requirement for versions below 5 */ |
1791 | if (newchd->header.version < 5 && newchd->header.flags & CHDFLAGS_HAS_PARENT) |
1792 | EARLY_EXIT(err = CHDERR_REQUIRES_PARENT); |
1793 | /* Detection for version 5 and above - if parentsha1 != 0, we have a parent */ |
1794 | else if (newchd->header.version >= 5 && memcmp(nullsha1, newchd->header.parentsha1, sizeof(newchd->header.parentsha1)) != 0) |
1795 | EARLY_EXIT(err = CHDERR_REQUIRES_PARENT); |
1796 | } |
1797 | |
1798 | /* make sure we have a valid parent */ |
1799 | if (parent != NULL) |
1800 | { |
1801 | /* check MD5 if it isn't empty */ |
1802 | if (memcmp(nullmd5, newchd->header.parentmd5, sizeof(newchd->header.parentmd5)) != 0 && |
1803 | memcmp(nullmd5, newchd->parent->header.md5, sizeof(newchd->parent->header.md5)) != 0 && |
1804 | memcmp(newchd->parent->header.md5, newchd->header.parentmd5, sizeof(newchd->header.parentmd5)) != 0) |
1805 | EARLY_EXIT(err = CHDERR_INVALID_PARENT); |
1806 | |
1807 | /* check SHA1 if it isn't empty */ |
1808 | if (memcmp(nullsha1, newchd->header.parentsha1, sizeof(newchd->header.parentsha1)) != 0 && |
1809 | memcmp(nullsha1, newchd->parent->header.sha1, sizeof(newchd->parent->header.sha1)) != 0 && |
1810 | memcmp(newchd->parent->header.sha1, newchd->header.parentsha1, sizeof(newchd->header.parentsha1)) != 0) |
1811 | EARLY_EXIT(err = CHDERR_INVALID_PARENT); |
1812 | } |
1813 | |
1814 | /* now read the hunk map */ |
1815 | if (newchd->header.version < 5) |
1816 | { |
1817 | err = map_read(newchd); |
1818 | if (err != CHDERR_NONE) |
1819 | EARLY_EXIT(err); |
1820 | } |
1821 | else |
1822 | { |
1823 | err = decompress_v5_map(newchd, &(newchd->header)); |
1824 | } |
1825 | if (err != CHDERR_NONE) |
1826 | EARLY_EXIT(err); |
1827 | |
1828 | #ifdef NEED_CACHE_HUNK |
1829 | /* allocate and init the hunk cache */ |
1830 | newchd->cache = (UINT8 *)malloc(newchd->header.hunkbytes); |
1831 | newchd->compare = (UINT8 *)malloc(newchd->header.hunkbytes); |
1832 | if (newchd->cache == NULL || newchd->compare == NULL) |
1833 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
1834 | newchd->cachehunk = ~0; |
1835 | newchd->comparehunk = ~0; |
1836 | #endif |
1837 | |
1838 | /* allocate the temporary compressed buffer */ |
1839 | newchd->compressed = (UINT8 *)malloc(newchd->header.hunkbytes); |
1840 | if (newchd->compressed == NULL) |
1841 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
1842 | |
1843 | /* find the codec interface */ |
1844 | if (newchd->header.version < 5) |
1845 | { |
1846 | for (intfnum = 0; intfnum < ARRAY_LENGTH(codec_interfaces); intfnum++) |
1847 | { |
1848 | if (codec_interfaces[intfnum].compression == newchd->header.compression[0]) |
1849 | { |
1850 | newchd->codecintf[0] = &codec_interfaces[intfnum]; |
1851 | break; |
1852 | } |
1853 | } |
1854 | |
1855 | if (intfnum == ARRAY_LENGTH(codec_interfaces)) |
1856 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1857 | |
1858 | /* initialize the codec */ |
1859 | if (newchd->codecintf[0]->init != NULL) |
1860 | { |
1861 | err = (*newchd->codecintf[0]->init)(&newchd->zlib_codec_data, newchd->header.hunkbytes); |
1862 | if (err != CHDERR_NONE) |
1863 | EARLY_EXIT(err); |
1864 | } |
1865 | } |
1866 | else |
1867 | { |
1868 | int decompnum; |
1869 | /* verify the compression types and initialize the codecs */ |
1870 | for (decompnum = 0; decompnum < ARRAY_LENGTH(newchd->header.compression); decompnum++) |
1871 | { |
1872 | int i; |
1873 | for (i = 0 ; i < ARRAY_LENGTH(codec_interfaces) ; i++) |
1874 | { |
1875 | if (codec_interfaces[i].compression == newchd->header.compression[decompnum]) |
1876 | { |
1877 | newchd->codecintf[decompnum] = &codec_interfaces[i]; |
1878 | break; |
1879 | } |
1880 | } |
1881 | |
1882 | if (newchd->codecintf[decompnum] == NULL && newchd->header.compression[decompnum] != 0) |
1883 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1884 | |
1885 | /* initialize the codec */ |
1886 | if (newchd->codecintf[decompnum]->init != NULL) |
1887 | { |
1888 | void* codec = NULL; |
1889 | switch (newchd->header.compression[decompnum]) |
1890 | { |
1891 | case CHD_CODEC_ZLIB: |
1892 | codec = &newchd->zlib_codec_data; |
1893 | break; |
1894 | |
9e052883 |
1895 | case CHD_CODEC_LZMA: |
1896 | codec = &newchd->lzma_codec_data; |
1897 | break; |
1898 | |
1899 | case CHD_CODEC_HUFFMAN: |
1900 | codec = &newchd->huff_codec_data; |
1901 | break; |
1902 | |
1903 | case CHD_CODEC_FLAC: |
1904 | codec = &newchd->flac_codec_data; |
1905 | break; |
1906 | |
648db22b |
1907 | case CHD_CODEC_ZSTD: |
1908 | codec = &newchd->zstd_codec_data; |
1909 | break; |
1910 | |
b24e7fce |
1911 | case CHD_CODEC_CD_ZLIB: |
1912 | codec = &newchd->cdzl_codec_data; |
1913 | break; |
1914 | |
1915 | case CHD_CODEC_CD_LZMA: |
1916 | codec = &newchd->cdlz_codec_data; |
1917 | break; |
1918 | |
1919 | case CHD_CODEC_CD_FLAC: |
1920 | codec = &newchd->cdfl_codec_data; |
1921 | break; |
648db22b |
1922 | |
1923 | case CHD_CODEC_CD_ZSTD: |
1924 | codec = &newchd->cdzs_codec_data; |
1925 | break; |
b24e7fce |
1926 | } |
1927 | |
1928 | if (codec == NULL) |
1929 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1930 | |
1931 | err = (*newchd->codecintf[decompnum]->init)(codec, newchd->header.hunkbytes); |
1932 | if (err != CHDERR_NONE) |
1933 | EARLY_EXIT(err); |
1934 | } |
1935 | } |
1936 | } |
1937 | |
1938 | /* all done */ |
1939 | *chd = newchd; |
1940 | return CHDERR_NONE; |
1941 | |
1942 | cleanup: |
1943 | if (newchd != NULL) |
1944 | chd_close(newchd); |
1945 | return err; |
1946 | } |
1947 | |
1948 | /*------------------------------------------------- |
1949 | chd_precache - precache underlying file in |
1950 | memory |
1951 | -------------------------------------------------*/ |
1952 | |
1953 | CHD_EXPORT chd_error chd_precache(chd_file *chd) |
1954 | { |
9e052883 |
1955 | INT64 count; |
1956 | UINT64 size; |
b24e7fce |
1957 | |
1958 | if (chd->file_cache == NULL) |
1959 | { |
9e052883 |
1960 | size = core_fsize(chd->file); |
1961 | if ((INT64)size <= 0) |
b24e7fce |
1962 | return CHDERR_INVALID_DATA; |
1963 | chd->file_cache = malloc(size); |
1964 | if (chd->file_cache == NULL) |
1965 | return CHDERR_OUT_OF_MEMORY; |
1966 | core_fseek(chd->file, 0, SEEK_SET); |
1967 | count = core_fread(chd->file, chd->file_cache, size); |
1968 | if (count != size) |
1969 | { |
1970 | free(chd->file_cache); |
1971 | chd->file_cache = NULL; |
1972 | return CHDERR_READ_ERROR; |
1973 | } |
1974 | } |
1975 | |
1976 | return CHDERR_NONE; |
1977 | } |
1978 | |
1979 | /*------------------------------------------------- |
1980 | chd_open - open a CHD file by |
1981 | filename |
1982 | -------------------------------------------------*/ |
1983 | |
1984 | CHD_EXPORT chd_error chd_open(const char *filename, int mode, chd_file *parent, chd_file **chd) |
1985 | { |
1986 | chd_error err; |
1987 | core_file *file = NULL; |
1988 | |
9e052883 |
1989 | if (filename == NULL) |
1990 | { |
1991 | err = CHDERR_INVALID_PARAMETER; |
1992 | goto cleanup; |
1993 | } |
1994 | |
b24e7fce |
1995 | /* choose the proper mode */ |
1996 | switch(mode) |
1997 | { |
1998 | case CHD_OPEN_READ: |
1999 | break; |
2000 | |
2001 | default: |
2002 | err = CHDERR_INVALID_PARAMETER; |
2003 | goto cleanup; |
2004 | } |
2005 | |
2006 | /* open the file */ |
9e052883 |
2007 | file = core_stdio_fopen(filename); |
b24e7fce |
2008 | if (file == 0) |
2009 | { |
2010 | err = CHDERR_FILE_NOT_FOUND; |
2011 | goto cleanup; |
2012 | } |
2013 | |
2014 | /* now open the CHD */ |
9e052883 |
2015 | return chd_open_core_file(file, mode, parent, chd); |
b24e7fce |
2016 | |
2017 | cleanup: |
2018 | if ((err != CHDERR_NONE) && (file != NULL)) |
2019 | core_fclose(file); |
2020 | return err; |
2021 | } |
2022 | |
2023 | /*------------------------------------------------- |
2024 | chd_close - close a CHD file for access |
2025 | -------------------------------------------------*/ |
2026 | |
2027 | CHD_EXPORT void chd_close(chd_file *chd) |
2028 | { |
2029 | /* punt if NULL or invalid */ |
2030 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
2031 | return; |
2032 | |
2033 | /* deinit the codec */ |
2034 | if (chd->header.version < 5) |
2035 | { |
2036 | if (chd->codecintf[0] != NULL && chd->codecintf[0]->free != NULL) |
2037 | (*chd->codecintf[0]->free)(&chd->zlib_codec_data); |
2038 | } |
2039 | else |
2040 | { |
2041 | int i; |
2042 | /* Free the codecs */ |
2043 | for (i = 0 ; i < ARRAY_LENGTH(chd->codecintf); i++) |
2044 | { |
2045 | void* codec = NULL; |
2046 | |
2047 | if (chd->codecintf[i] == NULL) |
2048 | continue; |
2049 | |
2050 | switch (chd->codecintf[i]->compression) |
2051 | { |
b24e7fce |
2052 | case CHD_CODEC_ZLIB: |
2053 | codec = &chd->zlib_codec_data; |
2054 | break; |
2055 | |
9e052883 |
2056 | case CHD_CODEC_LZMA: |
2057 | codec = &chd->lzma_codec_data; |
2058 | break; |
2059 | |
2060 | case CHD_CODEC_HUFFMAN: |
2061 | codec = &chd->huff_codec_data; |
2062 | break; |
2063 | |
2064 | case CHD_CODEC_FLAC: |
2065 | codec = &chd->flac_codec_data; |
2066 | break; |
2067 | |
648db22b |
2068 | case CHD_CODEC_ZSTD: |
2069 | codec = &chd->zstd_codec_data; |
2070 | break; |
2071 | |
b24e7fce |
2072 | case CHD_CODEC_CD_ZLIB: |
2073 | codec = &chd->cdzl_codec_data; |
2074 | break; |
2075 | |
9e052883 |
2076 | case CHD_CODEC_CD_LZMA: |
2077 | codec = &chd->cdlz_codec_data; |
2078 | break; |
2079 | |
b24e7fce |
2080 | case CHD_CODEC_CD_FLAC: |
2081 | codec = &chd->cdfl_codec_data; |
2082 | break; |
648db22b |
2083 | |
2084 | case CHD_CODEC_CD_ZSTD: |
2085 | codec = &chd->cdzs_codec_data; |
2086 | break; |
b24e7fce |
2087 | } |
2088 | |
2089 | if (codec) |
2090 | { |
2091 | (*chd->codecintf[i]->free)(codec); |
2092 | } |
2093 | } |
2094 | |
2095 | /* Free the raw map */ |
2096 | if (chd->header.rawmap != NULL) |
2097 | free(chd->header.rawmap); |
2098 | } |
2099 | |
2100 | /* free the compressed data buffer */ |
2101 | if (chd->compressed != NULL) |
2102 | free(chd->compressed); |
2103 | |
2104 | #ifdef NEED_CACHE_HUNK |
2105 | /* free the hunk cache and compare data */ |
2106 | if (chd->compare != NULL) |
2107 | free(chd->compare); |
2108 | if (chd->cache != NULL) |
2109 | free(chd->cache); |
2110 | #endif |
2111 | |
2112 | /* free the hunk map */ |
2113 | if (chd->map != NULL) |
2114 | free(chd->map); |
2115 | |
2116 | /* close the file */ |
9e052883 |
2117 | if (chd->file != NULL) |
b24e7fce |
2118 | core_fclose(chd->file); |
2119 | |
2120 | #ifdef NEED_CACHE_HUNK |
2121 | if (PRINTF_MAX_HUNK) printf("Max hunk = %d/%d\n", chd->maxhunk, chd->header.totalhunks); |
2122 | #endif |
2123 | if (chd->file_cache) |
2124 | free(chd->file_cache); |
2125 | |
2126 | if (chd->parent) |
2127 | chd_close(chd->parent); |
2128 | |
2129 | /* free our memory */ |
2130 | free(chd); |
2131 | } |
2132 | |
2133 | /*------------------------------------------------- |
2134 | chd_core_file - return the associated |
2135 | core_file |
2136 | -------------------------------------------------*/ |
2137 | |
2138 | CHD_EXPORT core_file *chd_core_file(chd_file *chd) |
2139 | { |
2140 | return chd->file; |
2141 | } |
2142 | |
2143 | /*------------------------------------------------- |
2144 | chd_error_string - return an error string for |
2145 | the given CHD error |
2146 | -------------------------------------------------*/ |
2147 | |
2148 | CHD_EXPORT const char *chd_error_string(chd_error err) |
2149 | { |
2150 | switch (err) |
2151 | { |
2152 | case CHDERR_NONE: return "no error"; |
2153 | case CHDERR_NO_INTERFACE: return "no drive interface"; |
2154 | case CHDERR_OUT_OF_MEMORY: return "out of memory"; |
2155 | case CHDERR_INVALID_FILE: return "invalid file"; |
2156 | case CHDERR_INVALID_PARAMETER: return "invalid parameter"; |
2157 | case CHDERR_INVALID_DATA: return "invalid data"; |
2158 | case CHDERR_FILE_NOT_FOUND: return "file not found"; |
2159 | case CHDERR_REQUIRES_PARENT: return "requires parent"; |
2160 | case CHDERR_FILE_NOT_WRITEABLE: return "file not writeable"; |
2161 | case CHDERR_READ_ERROR: return "read error"; |
2162 | case CHDERR_WRITE_ERROR: return "write error"; |
2163 | case CHDERR_CODEC_ERROR: return "codec error"; |
2164 | case CHDERR_INVALID_PARENT: return "invalid parent"; |
2165 | case CHDERR_HUNK_OUT_OF_RANGE: return "hunk out of range"; |
2166 | case CHDERR_DECOMPRESSION_ERROR: return "decompression error"; |
2167 | case CHDERR_COMPRESSION_ERROR: return "compression error"; |
2168 | case CHDERR_CANT_CREATE_FILE: return "can't create file"; |
2169 | case CHDERR_CANT_VERIFY: return "can't verify file"; |
2170 | case CHDERR_NOT_SUPPORTED: return "operation not supported"; |
2171 | case CHDERR_METADATA_NOT_FOUND: return "can't find metadata"; |
2172 | case CHDERR_INVALID_METADATA_SIZE: return "invalid metadata size"; |
2173 | case CHDERR_UNSUPPORTED_VERSION: return "unsupported CHD version"; |
2174 | case CHDERR_VERIFY_INCOMPLETE: return "incomplete verify"; |
2175 | case CHDERR_INVALID_METADATA: return "invalid metadata"; |
2176 | case CHDERR_INVALID_STATE: return "invalid state"; |
2177 | case CHDERR_OPERATION_PENDING: return "operation pending"; |
2178 | case CHDERR_NO_ASYNC_OPERATION: return "no async operation in progress"; |
2179 | case CHDERR_UNSUPPORTED_FORMAT: return "unsupported format"; |
2180 | default: return "undocumented error"; |
2181 | } |
2182 | } |
2183 | |
2184 | /*************************************************************************** |
2185 | CHD HEADER MANAGEMENT |
2186 | ***************************************************************************/ |
2187 | |
2188 | /*------------------------------------------------- |
2189 | chd_get_header - return a pointer to the |
2190 | extracted header data |
2191 | -------------------------------------------------*/ |
2192 | |
2193 | CHD_EXPORT const chd_header *chd_get_header(chd_file *chd) |
2194 | { |
2195 | /* punt if NULL or invalid */ |
2196 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
2197 | return NULL; |
2198 | |
2199 | return &chd->header; |
2200 | } |
2201 | |
2202 | /*------------------------------------------------- |
2203 | chd_read_header - read CHD header data |
2204 | from file into the pointed struct |
2205 | -------------------------------------------------*/ |
2206 | CHD_EXPORT chd_error chd_read_header(const char *filename, chd_header *header) |
2207 | { |
2208 | chd_error err = CHDERR_NONE; |
2209 | chd_file chd; |
2210 | |
2211 | /* punt if NULL */ |
2212 | if (filename == NULL || header == NULL) |
2213 | EARLY_EXIT(err = CHDERR_INVALID_PARAMETER); |
2214 | |
2215 | /* open the file */ |
9e052883 |
2216 | chd.file = core_stdio_fopen(filename); |
b24e7fce |
2217 | if (chd.file == NULL) |
2218 | EARLY_EXIT(err = CHDERR_FILE_NOT_FOUND); |
2219 | |
2220 | /* attempt to read the header */ |
2221 | err = header_read(&chd, header); |
2222 | if (err != CHDERR_NONE) |
2223 | EARLY_EXIT(err); |
2224 | |
2225 | /* validate the header */ |
2226 | err = header_validate(header); |
2227 | if (err != CHDERR_NONE) |
2228 | EARLY_EXIT(err); |
2229 | |
2230 | cleanup: |
2231 | if (chd.file != NULL) |
2232 | core_fclose(chd.file); |
2233 | |
2234 | return err; |
2235 | } |
2236 | |
2237 | /*************************************************************************** |
2238 | CORE DATA READ/WRITE |
2239 | ***************************************************************************/ |
2240 | |
2241 | /*------------------------------------------------- |
2242 | chd_read - read a single hunk from the CHD |
2243 | file |
2244 | -------------------------------------------------*/ |
2245 | |
2246 | CHD_EXPORT chd_error chd_read(chd_file *chd, UINT32 hunknum, void *buffer) |
2247 | { |
2248 | /* punt if NULL or invalid */ |
2249 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
2250 | return CHDERR_INVALID_PARAMETER; |
2251 | |
2252 | /* if we're past the end, fail */ |
2253 | if (hunknum >= chd->header.totalhunks) |
2254 | return CHDERR_HUNK_OUT_OF_RANGE; |
2255 | |
2256 | /* perform the read */ |
2257 | return hunk_read_into_memory(chd, hunknum, (UINT8 *)buffer); |
2258 | } |
2259 | |
2260 | /*************************************************************************** |
2261 | METADATA MANAGEMENT |
2262 | ***************************************************************************/ |
2263 | |
2264 | /*------------------------------------------------- |
2265 | chd_get_metadata - get the indexed metadata |
2266 | of the given type |
2267 | -------------------------------------------------*/ |
2268 | |
2269 | CHD_EXPORT chd_error chd_get_metadata(chd_file *chd, UINT32 searchtag, UINT32 searchindex, void *output, UINT32 outputlen, UINT32 *resultlen, UINT32 *resulttag, UINT8 *resultflags) |
2270 | { |
2271 | metadata_entry metaentry; |
2272 | chd_error err; |
2273 | UINT32 count; |
2274 | |
2275 | /* if we didn't find it, just return */ |
2276 | err = metadata_find_entry(chd, searchtag, searchindex, &metaentry); |
2277 | if (err != CHDERR_NONE) |
2278 | { |
2279 | /* unless we're an old version and they are requesting hard disk metadata */ |
2280 | if (chd->header.version < 3 && (searchtag == HARD_DISK_METADATA_TAG || searchtag == CHDMETATAG_WILDCARD) && searchindex == 0) |
2281 | { |
2282 | char faux_metadata[256]; |
2283 | UINT32 faux_length; |
2284 | |
2285 | /* fill in the faux metadata */ |
2286 | sprintf(faux_metadata, HARD_DISK_METADATA_FORMAT, chd->header.obsolete_cylinders, chd->header.obsolete_heads, chd->header.obsolete_sectors, chd->header.hunkbytes / chd->header.obsolete_hunksize); |
2287 | faux_length = (UINT32)strlen(faux_metadata) + 1; |
2288 | |
2289 | /* copy the metadata itself */ |
2290 | memcpy(output, faux_metadata, MIN(outputlen, faux_length)); |
2291 | |
2292 | /* return the length of the data and the tag */ |
2293 | if (resultlen != NULL) |
2294 | *resultlen = faux_length; |
2295 | if (resulttag != NULL) |
2296 | *resulttag = HARD_DISK_METADATA_TAG; |
2297 | return CHDERR_NONE; |
2298 | } |
2299 | return err; |
2300 | } |
2301 | |
2302 | /* read the metadata */ |
2303 | outputlen = MIN(outputlen, metaentry.length); |
2304 | core_fseek(chd->file, metaentry.offset + METADATA_HEADER_SIZE, SEEK_SET); |
2305 | count = core_fread(chd->file, output, outputlen); |
2306 | if (count != outputlen) |
2307 | return CHDERR_READ_ERROR; |
2308 | |
2309 | /* return the length of the data and the tag */ |
2310 | if (resultlen != NULL) |
2311 | *resultlen = metaentry.length; |
2312 | if (resulttag != NULL) |
2313 | *resulttag = metaentry.metatag; |
2314 | if (resultflags != NULL) |
2315 | *resultflags = metaentry.flags; |
2316 | return CHDERR_NONE; |
2317 | } |
2318 | |
2319 | /*************************************************************************** |
2320 | CODEC INTERFACES |
2321 | ***************************************************************************/ |
2322 | |
2323 | /*------------------------------------------------- |
2324 | chd_codec_config - set internal codec |
2325 | parameters |
2326 | -------------------------------------------------*/ |
2327 | |
2328 | CHD_EXPORT chd_error chd_codec_config(chd_file *chd, int param, void *config) |
2329 | { |
2330 | return CHDERR_INVALID_PARAMETER; |
2331 | } |
2332 | |
2333 | /*------------------------------------------------- |
2334 | chd_get_codec_name - get the name of a |
2335 | particular codec |
2336 | -------------------------------------------------*/ |
2337 | |
2338 | CHD_EXPORT const char *chd_get_codec_name(UINT32 codec) |
2339 | { |
2340 | return "Unknown"; |
2341 | } |
2342 | |
2343 | /*************************************************************************** |
2344 | INTERNAL HEADER OPERATIONS |
2345 | ***************************************************************************/ |
2346 | |
2347 | /*------------------------------------------------- |
2348 | header_validate - check the validity of a |
2349 | CHD header |
2350 | -------------------------------------------------*/ |
2351 | |
2352 | static chd_error header_validate(const chd_header *header) |
2353 | { |
2354 | int intfnum; |
2355 | |
2356 | /* require a valid version */ |
2357 | if (header->version == 0 || header->version > CHD_HEADER_VERSION) |
2358 | return CHDERR_UNSUPPORTED_VERSION; |
2359 | |
2360 | /* require a valid length */ |
2361 | if ((header->version == 1 && header->length != CHD_V1_HEADER_SIZE) || |
2362 | (header->version == 2 && header->length != CHD_V2_HEADER_SIZE) || |
2363 | (header->version == 3 && header->length != CHD_V3_HEADER_SIZE) || |
2364 | (header->version == 4 && header->length != CHD_V4_HEADER_SIZE) || |
2365 | (header->version == 5 && header->length != CHD_V5_HEADER_SIZE)) |
2366 | return CHDERR_INVALID_PARAMETER; |
2367 | |
2368 | /* Do not validate v5 header */ |
2369 | if (header->version <= 4) |
2370 | { |
2371 | /* require valid flags */ |
2372 | if (header->flags & CHDFLAGS_UNDEFINED) |
2373 | return CHDERR_INVALID_PARAMETER; |
2374 | |
2375 | /* require a supported compression mechanism */ |
2376 | for (intfnum = 0; intfnum < ARRAY_LENGTH(codec_interfaces); intfnum++) |
2377 | if (codec_interfaces[intfnum].compression == header->compression[0]) |
2378 | break; |
2379 | |
2380 | if (intfnum == ARRAY_LENGTH(codec_interfaces)) |
2381 | return CHDERR_INVALID_PARAMETER; |
2382 | |
2383 | /* require a valid hunksize */ |
2384 | if (header->hunkbytes == 0 || header->hunkbytes >= 65536 * 256) |
2385 | return CHDERR_INVALID_PARAMETER; |
2386 | |
2387 | /* require a valid hunk count */ |
2388 | if (header->totalhunks == 0) |
2389 | return CHDERR_INVALID_PARAMETER; |
2390 | |
2391 | /* require a valid MD5 and/or SHA1 if we're using a parent */ |
2392 | if ((header->flags & CHDFLAGS_HAS_PARENT) && memcmp(header->parentmd5, nullmd5, sizeof(nullmd5)) == 0 && memcmp(header->parentsha1, nullsha1, sizeof(nullsha1)) == 0) |
2393 | return CHDERR_INVALID_PARAMETER; |
2394 | |
2395 | /* if we're V3 or later, the obsolete fields must be 0 */ |
2396 | if (header->version >= 3 && |
2397 | (header->obsolete_cylinders != 0 || header->obsolete_sectors != 0 || |
2398 | header->obsolete_heads != 0 || header->obsolete_hunksize != 0)) |
2399 | return CHDERR_INVALID_PARAMETER; |
2400 | |
2401 | /* if we're pre-V3, the obsolete fields must NOT be 0 */ |
2402 | if (header->version < 3 && |
2403 | (header->obsolete_cylinders == 0 || header->obsolete_sectors == 0 || |
2404 | header->obsolete_heads == 0 || header->obsolete_hunksize == 0)) |
2405 | return CHDERR_INVALID_PARAMETER; |
2406 | } |
2407 | |
2408 | return CHDERR_NONE; |
2409 | } |
2410 | |
2411 | /*------------------------------------------------- |
2412 | header_guess_unitbytes - for older CHD formats, |
2413 | guess at the bytes/unit based on metadata |
2414 | -------------------------------------------------*/ |
2415 | |
2416 | static UINT32 header_guess_unitbytes(chd_file *chd) |
2417 | { |
2418 | /* look for hard disk metadata; if found, then the unit size == sector size */ |
2419 | char metadata[512]; |
2420 | int i0, i1, i2, i3; |
2421 | if (chd_get_metadata(chd, HARD_DISK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE && |
2422 | sscanf(metadata, HARD_DISK_METADATA_FORMAT, &i0, &i1, &i2, &i3) == 4) |
2423 | return i3; |
2424 | |
2425 | /* look for CD-ROM metadata; if found, then the unit size == CD frame size */ |
2426 | if (chd_get_metadata(chd, CDROM_OLD_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
2427 | chd_get_metadata(chd, CDROM_TRACK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
2428 | chd_get_metadata(chd, CDROM_TRACK_METADATA2_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
2429 | chd_get_metadata(chd, GDROM_OLD_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
2430 | chd_get_metadata(chd, GDROM_TRACK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE) |
2431 | return CD_FRAME_SIZE; |
2432 | |
2433 | /* otherwise, just map 1:1 with the hunk size */ |
2434 | return chd->header.hunkbytes; |
2435 | } |
2436 | |
2437 | /*------------------------------------------------- |
2438 | header_read - read a CHD header into the |
2439 | internal data structure |
2440 | -------------------------------------------------*/ |
2441 | |
2442 | static chd_error header_read(chd_file *chd, chd_header *header) |
2443 | { |
2444 | UINT8 rawheader[CHD_MAX_HEADER_SIZE]; |
2445 | UINT32 count; |
2446 | |
2447 | /* punt if NULL */ |
2448 | if (header == NULL) |
2449 | return CHDERR_INVALID_PARAMETER; |
2450 | |
2451 | /* punt if invalid file */ |
2452 | if (chd->file == NULL) |
2453 | return CHDERR_INVALID_FILE; |
2454 | |
2455 | /* seek and read */ |
2456 | core_fseek(chd->file, 0, SEEK_SET); |
2457 | count = core_fread(chd->file, rawheader, sizeof(rawheader)); |
2458 | if (count != sizeof(rawheader)) |
2459 | return CHDERR_READ_ERROR; |
2460 | |
2461 | /* verify the tag */ |
2462 | if (strncmp((char *)rawheader, "MComprHD", 8) != 0) |
2463 | return CHDERR_INVALID_DATA; |
2464 | |
2465 | /* extract the direct data */ |
2466 | memset(header, 0, sizeof(*header)); |
2467 | header->length = get_bigendian_uint32(&rawheader[8]); |
2468 | header->version = get_bigendian_uint32(&rawheader[12]); |
2469 | |
2470 | /* make sure it's a version we understand */ |
2471 | if (header->version == 0 || header->version > CHD_HEADER_VERSION) |
2472 | return CHDERR_UNSUPPORTED_VERSION; |
2473 | |
2474 | /* make sure the length is expected */ |
2475 | if ((header->version == 1 && header->length != CHD_V1_HEADER_SIZE) || |
2476 | (header->version == 2 && header->length != CHD_V2_HEADER_SIZE) || |
2477 | (header->version == 3 && header->length != CHD_V3_HEADER_SIZE) || |
2478 | (header->version == 4 && header->length != CHD_V4_HEADER_SIZE) || |
2479 | (header->version == 5 && header->length != CHD_V5_HEADER_SIZE)) |
2480 | |
2481 | return CHDERR_INVALID_DATA; |
2482 | |
2483 | /* extract the common data */ |
2484 | header->flags = get_bigendian_uint32(&rawheader[16]); |
2485 | header->compression[0] = get_bigendian_uint32(&rawheader[20]); |
2486 | header->compression[1] = CHD_CODEC_NONE; |
2487 | header->compression[2] = CHD_CODEC_NONE; |
2488 | header->compression[3] = CHD_CODEC_NONE; |
2489 | |
2490 | /* extract the V1/V2-specific data */ |
2491 | if (header->version < 3) |
2492 | { |
2493 | int seclen = (header->version == 1) ? CHD_V1_SECTOR_SIZE : get_bigendian_uint32(&rawheader[76]); |
2494 | header->obsolete_hunksize = get_bigendian_uint32(&rawheader[24]); |
2495 | header->totalhunks = get_bigendian_uint32(&rawheader[28]); |
2496 | header->obsolete_cylinders = get_bigendian_uint32(&rawheader[32]); |
2497 | header->obsolete_heads = get_bigendian_uint32(&rawheader[36]); |
2498 | header->obsolete_sectors = get_bigendian_uint32(&rawheader[40]); |
2499 | memcpy(header->md5, &rawheader[44], CHD_MD5_BYTES); |
2500 | memcpy(header->parentmd5, &rawheader[60], CHD_MD5_BYTES); |
2501 | header->logicalbytes = (UINT64)header->obsolete_cylinders * (UINT64)header->obsolete_heads * (UINT64)header->obsolete_sectors * (UINT64)seclen; |
2502 | header->hunkbytes = seclen * header->obsolete_hunksize; |
2503 | header->unitbytes = header_guess_unitbytes(chd); |
9e052883 |
2504 | if (header->unitbytes == 0) |
2505 | return CHDERR_INVALID_DATA; |
b24e7fce |
2506 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
2507 | header->metaoffset = 0; |
2508 | } |
2509 | |
2510 | /* extract the V3-specific data */ |
2511 | else if (header->version == 3) |
2512 | { |
2513 | header->totalhunks = get_bigendian_uint32(&rawheader[24]); |
2514 | header->logicalbytes = get_bigendian_uint64(&rawheader[28]); |
2515 | header->metaoffset = get_bigendian_uint64(&rawheader[36]); |
2516 | memcpy(header->md5, &rawheader[44], CHD_MD5_BYTES); |
2517 | memcpy(header->parentmd5, &rawheader[60], CHD_MD5_BYTES); |
2518 | header->hunkbytes = get_bigendian_uint32(&rawheader[76]); |
2519 | header->unitbytes = header_guess_unitbytes(chd); |
9e052883 |
2520 | if (header->unitbytes == 0) |
2521 | return CHDERR_INVALID_DATA; |
b24e7fce |
2522 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
2523 | memcpy(header->sha1, &rawheader[80], CHD_SHA1_BYTES); |
2524 | memcpy(header->parentsha1, &rawheader[100], CHD_SHA1_BYTES); |
2525 | } |
2526 | |
2527 | /* extract the V4-specific data */ |
2528 | else if (header->version == 4) |
2529 | { |
2530 | header->totalhunks = get_bigendian_uint32(&rawheader[24]); |
2531 | header->logicalbytes = get_bigendian_uint64(&rawheader[28]); |
2532 | header->metaoffset = get_bigendian_uint64(&rawheader[36]); |
2533 | header->hunkbytes = get_bigendian_uint32(&rawheader[44]); |
2534 | header->unitbytes = header_guess_unitbytes(chd); |
9e052883 |
2535 | if (header->unitbytes == 0) |
2536 | return CHDERR_INVALID_DATA; |
b24e7fce |
2537 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
2538 | memcpy(header->sha1, &rawheader[48], CHD_SHA1_BYTES); |
2539 | memcpy(header->parentsha1, &rawheader[68], CHD_SHA1_BYTES); |
2540 | memcpy(header->rawsha1, &rawheader[88], CHD_SHA1_BYTES); |
2541 | } |
2542 | |
2543 | /* extract the V5-specific data */ |
2544 | else if (header->version == 5) |
2545 | { |
2546 | /* TODO */ |
2547 | header->compression[0] = get_bigendian_uint32(&rawheader[16]); |
2548 | header->compression[1] = get_bigendian_uint32(&rawheader[20]); |
2549 | header->compression[2] = get_bigendian_uint32(&rawheader[24]); |
2550 | header->compression[3] = get_bigendian_uint32(&rawheader[28]); |
2551 | header->logicalbytes = get_bigendian_uint64(&rawheader[32]); |
2552 | header->mapoffset = get_bigendian_uint64(&rawheader[40]); |
2553 | header->metaoffset = get_bigendian_uint64(&rawheader[48]); |
2554 | header->hunkbytes = get_bigendian_uint32(&rawheader[56]); |
9e052883 |
2555 | if (header->hunkbytes == 0) |
2556 | return CHDERR_INVALID_DATA; |
b24e7fce |
2557 | header->hunkcount = (header->logicalbytes + header->hunkbytes - 1) / header->hunkbytes; |
2558 | header->unitbytes = get_bigendian_uint32(&rawheader[60]); |
9e052883 |
2559 | if (header->unitbytes == 0) |
2560 | return CHDERR_INVALID_DATA; |
b24e7fce |
2561 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
2562 | memcpy(header->sha1, &rawheader[84], CHD_SHA1_BYTES); |
2563 | memcpy(header->parentsha1, &rawheader[104], CHD_SHA1_BYTES); |
2564 | memcpy(header->rawsha1, &rawheader[64], CHD_SHA1_BYTES); |
2565 | |
2566 | /* determine properties of map entries */ |
2567 | header->mapentrybytes = chd_compressed(header) ? 12 : 4; |
2568 | |
2569 | /* hack */ |
2570 | header->totalhunks = header->hunkcount; |
2571 | } |
2572 | |
2573 | /* Unknown version */ |
2574 | else |
2575 | { |
2576 | /* TODO */ |
2577 | } |
2578 | |
2579 | /* guess it worked */ |
2580 | return CHDERR_NONE; |
2581 | } |
2582 | |
2583 | /*************************************************************************** |
2584 | INTERNAL HUNK READ/WRITE |
2585 | ***************************************************************************/ |
2586 | |
2587 | /*------------------------------------------------- |
2588 | hunk_read_compressed - read a compressed |
2589 | hunk |
2590 | -------------------------------------------------*/ |
2591 | |
2592 | static UINT8* hunk_read_compressed(chd_file *chd, UINT64 offset, size_t size) |
2593 | { |
2594 | #ifdef _MSC_VER |
2595 | size_t bytes; |
2596 | #else |
2597 | ssize_t bytes; |
2598 | #endif |
2599 | if (chd->file_cache != NULL) |
2600 | { |
2601 | return chd->file_cache + offset; |
2602 | } |
2603 | else |
2604 | { |
2605 | core_fseek(chd->file, offset, SEEK_SET); |
2606 | bytes = core_fread(chd->file, chd->compressed, size); |
2607 | if (bytes != size) |
2608 | return NULL; |
2609 | return chd->compressed; |
2610 | } |
2611 | } |
2612 | |
2613 | /*------------------------------------------------- |
2614 | hunk_read_uncompressed - read an uncompressed |
2615 | hunk |
2616 | -------------------------------------------------*/ |
2617 | |
2618 | static chd_error hunk_read_uncompressed(chd_file *chd, UINT64 offset, size_t size, UINT8 *dest) |
2619 | { |
2620 | #ifdef _MSC_VER |
2621 | size_t bytes; |
2622 | #else |
2623 | ssize_t bytes; |
2624 | #endif |
2625 | if (chd->file_cache != NULL) |
2626 | { |
2627 | memcpy(dest, chd->file_cache + offset, size); |
2628 | } |
2629 | else |
2630 | { |
2631 | core_fseek(chd->file, offset, SEEK_SET); |
2632 | bytes = core_fread(chd->file, dest, size); |
2633 | if (bytes != size) |
2634 | return CHDERR_READ_ERROR; |
2635 | } |
2636 | return CHDERR_NONE; |
2637 | } |
2638 | |
2639 | #ifdef NEED_CACHE_HUNK |
2640 | /*------------------------------------------------- |
2641 | hunk_read_into_cache - read a hunk into |
2642 | the CHD's hunk cache |
2643 | -------------------------------------------------*/ |
2644 | |
2645 | static chd_error hunk_read_into_cache(chd_file *chd, UINT32 hunknum) |
2646 | { |
2647 | chd_error err; |
2648 | |
2649 | /* track the max */ |
2650 | if (hunknum > chd->maxhunk) |
2651 | chd->maxhunk = hunknum; |
2652 | |
2653 | /* if we're already in the cache, we're done */ |
2654 | if (chd->cachehunk == hunknum) |
2655 | return CHDERR_NONE; |
2656 | chd->cachehunk = ~0; |
2657 | |
2658 | /* otherwise, read the data */ |
2659 | err = hunk_read_into_memory(chd, hunknum, chd->cache); |
2660 | if (err != CHDERR_NONE) |
2661 | return err; |
2662 | |
2663 | /* mark the hunk successfully cached in */ |
2664 | chd->cachehunk = hunknum; |
2665 | return CHDERR_NONE; |
2666 | } |
2667 | #endif |
2668 | |
2669 | /*------------------------------------------------- |
2670 | hunk_read_into_memory - read a hunk into |
2671 | memory at the given location |
2672 | -------------------------------------------------*/ |
2673 | |
2674 | static chd_error hunk_read_into_memory(chd_file *chd, UINT32 hunknum, UINT8 *dest) |
2675 | { |
2676 | chd_error err; |
2677 | |
2678 | /* punt if no file */ |
2679 | if (chd->file == NULL) |
2680 | return CHDERR_INVALID_FILE; |
2681 | |
2682 | /* return an error if out of range */ |
2683 | if (hunknum >= chd->header.totalhunks) |
2684 | return CHDERR_HUNK_OUT_OF_RANGE; |
2685 | |
2686 | if (dest == NULL) |
2687 | return CHDERR_INVALID_PARAMETER; |
2688 | |
2689 | if (chd->header.version < 5) |
2690 | { |
2691 | map_entry *entry = &chd->map[hunknum]; |
2692 | UINT32 bytes; |
2693 | UINT8* compressed_bytes; |
2694 | |
2695 | /* switch off the entry type */ |
2696 | switch (entry->flags & MAP_ENTRY_FLAG_TYPE_MASK) |
2697 | { |
2698 | /* compressed data */ |
2699 | case V34_MAP_ENTRY_TYPE_COMPRESSED: |
2700 | { |
2701 | void *codec = NULL; |
2702 | |
2703 | /* read it into the decompression buffer */ |
2704 | compressed_bytes = hunk_read_compressed(chd, entry->offset, entry->length); |
2705 | if (compressed_bytes == NULL) |
648db22b |
2706 | { |
b24e7fce |
2707 | return CHDERR_READ_ERROR; |
648db22b |
2708 | } |
b24e7fce |
2709 | |
2710 | /* now decompress using the codec */ |
2711 | err = CHDERR_NONE; |
2712 | codec = &chd->zlib_codec_data; |
2713 | if (chd->codecintf[0]->decompress != NULL) |
2714 | err = (*chd->codecintf[0]->decompress)(codec, compressed_bytes, entry->length, dest, chd->header.hunkbytes); |
2715 | if (err != CHDERR_NONE) |
2716 | return err; |
2717 | break; |
2718 | } |
2719 | |
2720 | /* uncompressed data */ |
2721 | case V34_MAP_ENTRY_TYPE_UNCOMPRESSED: |
2722 | err = hunk_read_uncompressed(chd, entry->offset, chd->header.hunkbytes, dest); |
2723 | if (err != CHDERR_NONE) |
2724 | return err; |
2725 | break; |
2726 | |
2727 | /* mini-compressed data */ |
2728 | case V34_MAP_ENTRY_TYPE_MINI: |
2729 | put_bigendian_uint64(&dest[0], entry->offset); |
2730 | for (bytes = 8; bytes < chd->header.hunkbytes; bytes++) |
2731 | dest[bytes] = dest[bytes - 8]; |
2732 | break; |
2733 | |
2734 | /* self-referenced data */ |
2735 | case V34_MAP_ENTRY_TYPE_SELF_HUNK: |
2736 | #ifdef NEED_CACHE_HUNK |
2737 | if (chd->cachehunk == entry->offset && dest == chd->cache) |
2738 | break; |
2739 | #endif |
2740 | return hunk_read_into_memory(chd, entry->offset, dest); |
2741 | |
2742 | /* parent-referenced data */ |
2743 | case V34_MAP_ENTRY_TYPE_PARENT_HUNK: |
2744 | err = hunk_read_into_memory(chd->parent, entry->offset, dest); |
2745 | if (err != CHDERR_NONE) |
2746 | return err; |
2747 | break; |
2748 | } |
2749 | return CHDERR_NONE; |
2750 | } |
2751 | else |
2752 | { |
2753 | void* codec = NULL; |
2754 | /* get a pointer to the map entry */ |
2755 | uint64_t blockoffs; |
2756 | uint32_t blocklen; |
2757 | #ifdef VERIFY_BLOCK_CRC |
2758 | uint16_t blockcrc; |
2759 | #endif |
2760 | uint8_t *rawmap = &chd->header.rawmap[chd->header.mapentrybytes * hunknum]; |
2761 | UINT8* compressed_bytes; |
2762 | |
2763 | /* uncompressed case */ |
2764 | if (!chd_compressed(&chd->header)) |
2765 | { |
2766 | blockoffs = (uint64_t)get_bigendian_uint32(rawmap) * (uint64_t)chd->header.hunkbytes; |
2767 | if (blockoffs != 0) { |
2768 | core_fseek(chd->file, blockoffs, SEEK_SET); |
2769 | int result = core_fread(chd->file, dest, chd->header.hunkbytes); |
2770 | /* TODO |
2771 | else if (m_parent_missing) |
2772 | throw CHDERR_REQUIRES_PARENT; */ |
2773 | } else if (chd->parent) { |
2774 | err = hunk_read_into_memory(chd->parent, hunknum, dest); |
2775 | if (err != CHDERR_NONE) |
2776 | return err; |
2777 | } else { |
2778 | memset(dest, 0, chd->header.hunkbytes); |
2779 | } |
2780 | |
2781 | return CHDERR_NONE; |
2782 | } |
2783 | |
2784 | /* compressed case */ |
2785 | blocklen = get_bigendian_uint24(&rawmap[1]); |
2786 | blockoffs = get_bigendian_uint48(&rawmap[4]); |
2787 | #ifdef VERIFY_BLOCK_CRC |
2788 | blockcrc = get_bigendian_uint16(&rawmap[10]); |
2789 | #endif |
2790 | codec = NULL; |
2791 | switch (rawmap[0]) |
2792 | { |
2793 | case COMPRESSION_TYPE_0: |
2794 | case COMPRESSION_TYPE_1: |
2795 | case COMPRESSION_TYPE_2: |
2796 | case COMPRESSION_TYPE_3: |
2797 | compressed_bytes = hunk_read_compressed(chd, blockoffs, blocklen); |
2798 | if (compressed_bytes == NULL) |
2799 | return CHDERR_READ_ERROR; |
2800 | switch (chd->codecintf[rawmap[0]]->compression) |
2801 | { |
b24e7fce |
2802 | case CHD_CODEC_ZLIB: |
2803 | codec = &chd->zlib_codec_data; |
2804 | break; |
2805 | |
9e052883 |
2806 | case CHD_CODEC_LZMA: |
2807 | codec = &chd->lzma_codec_data; |
2808 | break; |
2809 | |
2810 | case CHD_CODEC_HUFFMAN: |
2811 | codec = &chd->huff_codec_data; |
2812 | break; |
2813 | |
2814 | case CHD_CODEC_FLAC: |
2815 | codec = &chd->flac_codec_data; |
2816 | break; |
2817 | |
648db22b |
2818 | case CHD_CODEC_ZSTD: |
2819 | codec = &chd->zstd_codec_data; |
2820 | break; |
2821 | |
b24e7fce |
2822 | case CHD_CODEC_CD_ZLIB: |
2823 | codec = &chd->cdzl_codec_data; |
2824 | break; |
2825 | |
9e052883 |
2826 | case CHD_CODEC_CD_LZMA: |
2827 | codec = &chd->cdlz_codec_data; |
2828 | break; |
2829 | |
b24e7fce |
2830 | case CHD_CODEC_CD_FLAC: |
2831 | codec = &chd->cdfl_codec_data; |
2832 | break; |
648db22b |
2833 | |
2834 | case CHD_CODEC_CD_ZSTD: |
2835 | codec = &chd->cdzs_codec_data; |
2836 | break; |
b24e7fce |
2837 | } |
2838 | if (codec==NULL) |
2839 | return CHDERR_CODEC_ERROR; |
2840 | err = chd->codecintf[rawmap[0]]->decompress(codec, compressed_bytes, blocklen, dest, chd->header.hunkbytes); |
2841 | if (err != CHDERR_NONE) |
2842 | return err; |
2843 | #ifdef VERIFY_BLOCK_CRC |
2844 | if (crc16(dest, chd->header.hunkbytes) != blockcrc) |
2845 | return CHDERR_DECOMPRESSION_ERROR; |
2846 | #endif |
2847 | return CHDERR_NONE; |
2848 | |
2849 | case COMPRESSION_NONE: |
2850 | err = hunk_read_uncompressed(chd, blockoffs, blocklen, dest); |
2851 | if (err != CHDERR_NONE) |
2852 | return err; |
2853 | #ifdef VERIFY_BLOCK_CRC |
2854 | if (crc16(dest, chd->header.hunkbytes) != blockcrc) |
2855 | return CHDERR_DECOMPRESSION_ERROR; |
2856 | #endif |
2857 | return CHDERR_NONE; |
2858 | |
2859 | case COMPRESSION_SELF: |
2860 | return hunk_read_into_memory(chd, blockoffs, dest); |
2861 | |
2862 | case COMPRESSION_PARENT: |
2863 | if (chd->parent == NULL) |
2864 | return CHDERR_REQUIRES_PARENT; |
2865 | UINT8 units_in_hunk = chd->header.hunkbytes / chd->header.unitbytes; |
2866 | |
2867 | /* blockoffs is aligned to units_in_hunk */ |
2868 | if (blockoffs % units_in_hunk == 0) { |
2869 | return hunk_read_into_memory(chd->parent, blockoffs / units_in_hunk, dest); |
2870 | /* blockoffs is not aligned to units_in_hunk */ |
2871 | } else { |
2872 | UINT32 unit_in_hunk = blockoffs % units_in_hunk; |
2873 | UINT8 *buf = malloc(chd->header.hunkbytes); |
2874 | /* Read first half of hunk which contains blockoffs */ |
2875 | err = hunk_read_into_memory(chd->parent, blockoffs / units_in_hunk, buf); |
2876 | if (err != CHDERR_NONE) { |
2877 | free(buf); |
2878 | return err; |
2879 | } |
2880 | memcpy(dest, buf + unit_in_hunk * chd->header.unitbytes, (units_in_hunk - unit_in_hunk) * chd->header.unitbytes); |
2881 | /* Read second half of hunk which contains blockoffs */ |
2882 | err = hunk_read_into_memory(chd->parent, (blockoffs / units_in_hunk) + 1, buf); |
2883 | if (err != CHDERR_NONE) { |
2884 | free(buf); |
2885 | return err; |
2886 | } |
2887 | memcpy(dest + (units_in_hunk - unit_in_hunk) * chd->header.unitbytes, buf, unit_in_hunk * chd->header.unitbytes); |
2888 | free(buf); |
2889 | } |
2890 | } |
2891 | return CHDERR_NONE; |
2892 | } |
2893 | |
2894 | /* We should not reach this code */ |
2895 | return CHDERR_DECOMPRESSION_ERROR; |
2896 | } |
2897 | |
2898 | /*************************************************************************** |
2899 | INTERNAL MAP ACCESS |
2900 | ***************************************************************************/ |
2901 | |
2902 | /*------------------------------------------------- |
2903 | map_read - read the initial sector map |
2904 | -------------------------------------------------*/ |
2905 | |
2906 | static chd_error map_read(chd_file *chd) |
2907 | { |
2908 | UINT32 entrysize = (chd->header.version < 3) ? OLD_MAP_ENTRY_SIZE : MAP_ENTRY_SIZE; |
2909 | UINT8 raw_map_entries[MAP_STACK_ENTRIES * MAP_ENTRY_SIZE]; |
2910 | UINT64 fileoffset, maxoffset = 0; |
2911 | UINT8 cookie[MAP_ENTRY_SIZE]; |
2912 | UINT32 count; |
2913 | chd_error err; |
9e052883 |
2914 | UINT32 i; |
b24e7fce |
2915 | |
2916 | /* first allocate memory */ |
2917 | chd->map = (map_entry *)malloc(sizeof(chd->map[0]) * chd->header.totalhunks); |
2918 | if (!chd->map) |
2919 | return CHDERR_OUT_OF_MEMORY; |
2920 | |
2921 | /* read the map entries in in chunks and extract to the map list */ |
2922 | fileoffset = chd->header.length; |
2923 | for (i = 0; i < chd->header.totalhunks; i += MAP_STACK_ENTRIES) |
2924 | { |
2925 | /* compute how many entries this time */ |
2926 | int entries = chd->header.totalhunks - i, j; |
2927 | if (entries > MAP_STACK_ENTRIES) |
2928 | entries = MAP_STACK_ENTRIES; |
2929 | |
2930 | /* read that many */ |
2931 | core_fseek(chd->file, fileoffset, SEEK_SET); |
2932 | count = core_fread(chd->file, raw_map_entries, entries * entrysize); |
2933 | if (count != entries * entrysize) |
2934 | { |
2935 | err = CHDERR_READ_ERROR; |
2936 | goto cleanup; |
2937 | } |
2938 | fileoffset += entries * entrysize; |
2939 | |
2940 | /* process that many */ |
2941 | if (entrysize == MAP_ENTRY_SIZE) |
2942 | { |
2943 | for (j = 0; j < entries; j++) |
2944 | map_extract(&raw_map_entries[j * MAP_ENTRY_SIZE], &chd->map[i + j]); |
2945 | } |
2946 | else |
2947 | { |
2948 | for (j = 0; j < entries; j++) |
2949 | map_extract_old(&raw_map_entries[j * OLD_MAP_ENTRY_SIZE], &chd->map[i + j], chd->header.hunkbytes); |
2950 | } |
2951 | |
2952 | /* track the maximum offset */ |
2953 | for (j = 0; j < entries; j++) |
2954 | if ((chd->map[i + j].flags & MAP_ENTRY_FLAG_TYPE_MASK) == V34_MAP_ENTRY_TYPE_COMPRESSED || |
2955 | (chd->map[i + j].flags & MAP_ENTRY_FLAG_TYPE_MASK) == V34_MAP_ENTRY_TYPE_UNCOMPRESSED) |
2956 | maxoffset = MAX(maxoffset, chd->map[i + j].offset + chd->map[i + j].length); |
2957 | } |
2958 | |
2959 | /* verify the cookie */ |
2960 | core_fseek(chd->file, fileoffset, SEEK_SET); |
2961 | count = core_fread(chd->file, &cookie, entrysize); |
2962 | if (count != entrysize || memcmp(&cookie, END_OF_LIST_COOKIE, entrysize)) |
2963 | { |
2964 | err = CHDERR_INVALID_FILE; |
2965 | goto cleanup; |
2966 | } |
2967 | |
2968 | /* verify the length */ |
2969 | if (maxoffset > core_fsize(chd->file)) |
2970 | { |
2971 | err = CHDERR_INVALID_FILE; |
2972 | goto cleanup; |
2973 | } |
2974 | return CHDERR_NONE; |
2975 | |
2976 | cleanup: |
2977 | if (chd->map) |
2978 | free(chd->map); |
2979 | chd->map = NULL; |
2980 | return err; |
2981 | } |
2982 | |
2983 | /*************************************************************************** |
2984 | INTERNAL METADATA ACCESS |
2985 | ***************************************************************************/ |
2986 | |
2987 | /*------------------------------------------------- |
2988 | metadata_find_entry - find a metadata entry |
2989 | -------------------------------------------------*/ |
2990 | |
2991 | static chd_error metadata_find_entry(chd_file *chd, UINT32 metatag, UINT32 metaindex, metadata_entry *metaentry) |
2992 | { |
2993 | /* start at the beginning */ |
2994 | metaentry->offset = chd->header.metaoffset; |
2995 | metaentry->prev = 0; |
2996 | |
2997 | /* loop until we run out of options */ |
2998 | while (metaentry->offset != 0) |
2999 | { |
3000 | UINT8 raw_meta_header[METADATA_HEADER_SIZE]; |
3001 | UINT32 count; |
3002 | |
3003 | /* read the raw header */ |
3004 | core_fseek(chd->file, metaentry->offset, SEEK_SET); |
3005 | count = core_fread(chd->file, raw_meta_header, sizeof(raw_meta_header)); |
3006 | if (count != sizeof(raw_meta_header)) |
3007 | break; |
3008 | |
3009 | /* extract the data */ |
3010 | metaentry->metatag = get_bigendian_uint32(&raw_meta_header[0]); |
3011 | metaentry->length = get_bigendian_uint32(&raw_meta_header[4]); |
3012 | metaentry->next = get_bigendian_uint64(&raw_meta_header[8]); |
3013 | |
3014 | /* flags are encoded in the high byte of length */ |
3015 | metaentry->flags = metaentry->length >> 24; |
3016 | metaentry->length &= 0x00ffffff; |
3017 | |
3018 | /* if we got a match, proceed */ |
3019 | if (metatag == CHDMETATAG_WILDCARD || metaentry->metatag == metatag) |
3020 | if (metaindex-- == 0) |
3021 | return CHDERR_NONE; |
3022 | |
3023 | /* no match, fetch the next link */ |
3024 | metaentry->prev = metaentry->offset; |
3025 | metaentry->offset = metaentry->next; |
3026 | } |
3027 | |
3028 | /* if we get here, we didn't find it */ |
3029 | return CHDERR_METADATA_NOT_FOUND; |
3030 | } |
3031 | |
3032 | /*************************************************************************** |
3033 | ZLIB COMPRESSION CODEC |
3034 | ***************************************************************************/ |
3035 | |
3036 | /*------------------------------------------------- |
3037 | zlib_codec_init - initialize the ZLIB codec |
3038 | -------------------------------------------------*/ |
3039 | |
3040 | static chd_error zlib_codec_init(void *codec, uint32_t hunkbytes) |
3041 | { |
3042 | int zerr; |
3043 | chd_error err; |
3044 | zlib_codec_data *data = (zlib_codec_data*)codec; |
3045 | |
3046 | /* clear the buffers */ |
3047 | memset(data, 0, sizeof(zlib_codec_data)); |
3048 | |
3049 | /* init the inflater first */ |
3050 | data->inflater.next_in = (Bytef *)data; /* bogus, but that's ok */ |
3051 | data->inflater.avail_in = 0; |
3052 | data->inflater.zalloc = zlib_fast_alloc; |
3053 | data->inflater.zfree = zlib_fast_free; |
3054 | data->inflater.opaque = &data->allocator; |
3055 | zerr = inflateInit2(&data->inflater, -MAX_WBITS); |
3056 | |
3057 | /* convert errors */ |
3058 | if (zerr == Z_MEM_ERROR) |
3059 | err = CHDERR_OUT_OF_MEMORY; |
3060 | else if (zerr != Z_OK) |
3061 | err = CHDERR_CODEC_ERROR; |
3062 | else |
3063 | err = CHDERR_NONE; |
3064 | |
b24e7fce |
3065 | return err; |
3066 | } |
3067 | |
3068 | /*------------------------------------------------- |
3069 | zlib_codec_free - free data for the ZLIB |
3070 | codec |
3071 | -------------------------------------------------*/ |
3072 | |
3073 | static void zlib_codec_free(void *codec) |
3074 | { |
3075 | zlib_codec_data *data = (zlib_codec_data *)codec; |
3076 | |
3077 | /* deinit the streams */ |
3078 | if (data != NULL) |
3079 | { |
b24e7fce |
3080 | inflateEnd(&data->inflater); |
3081 | |
3082 | /* free our fast memory */ |
3083 | zlib_allocator_free(&data->allocator); |
3084 | } |
3085 | } |
3086 | |
3087 | /*------------------------------------------------- |
3088 | zlib_codec_decompress - decompress data using |
3089 | the ZLIB codec |
3090 | -------------------------------------------------*/ |
3091 | |
3092 | static chd_error zlib_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
3093 | { |
3094 | zlib_codec_data *data = (zlib_codec_data *)codec; |
3095 | int zerr; |
3096 | |
3097 | /* reset the decompressor */ |
3098 | data->inflater.next_in = (Bytef *)src; |
3099 | data->inflater.avail_in = complen; |
3100 | data->inflater.total_in = 0; |
3101 | data->inflater.next_out = (Bytef *)dest; |
3102 | data->inflater.avail_out = destlen; |
3103 | data->inflater.total_out = 0; |
3104 | zerr = inflateReset(&data->inflater); |
3105 | if (zerr != Z_OK) |
3106 | return CHDERR_DECOMPRESSION_ERROR; |
3107 | |
3108 | /* do it */ |
3109 | zerr = inflate(&data->inflater, Z_FINISH); |
3110 | if (data->inflater.total_out != destlen) |
3111 | return CHDERR_DECOMPRESSION_ERROR; |
3112 | |
3113 | return CHDERR_NONE; |
3114 | } |
3115 | |
3116 | /*------------------------------------------------- |
3117 | zlib_fast_alloc - fast malloc for ZLIB, which |
3118 | allocates and frees memory frequently |
3119 | -------------------------------------------------*/ |
3120 | |
3121 | /* Huge alignment values for possible SIMD optimization by compiler (NEON, SSE, AVX) */ |
3122 | #define ZLIB_MIN_ALIGNMENT_BITS 512 |
3123 | #define ZLIB_MIN_ALIGNMENT_BYTES (ZLIB_MIN_ALIGNMENT_BITS / 8) |
3124 | |
3125 | static voidpf zlib_fast_alloc(voidpf opaque, uInt items, uInt size) |
3126 | { |
3127 | zlib_allocator *alloc = (zlib_allocator *)opaque; |
3128 | uintptr_t paddr = 0; |
3129 | UINT32 *ptr; |
3130 | int i; |
3131 | |
3132 | /* compute the size, rounding to the nearest 1k */ |
3133 | size = (size * items + 0x3ff) & ~0x3ff; |
3134 | |
3135 | /* reuse a hunk if we can */ |
3136 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
3137 | { |
3138 | ptr = alloc->allocptr[i]; |
3139 | if (ptr && size == *ptr) |
3140 | { |
3141 | /* set the low bit of the size so we don't match next time */ |
3142 | *ptr |= 1; |
3143 | |
3144 | /* return aligned block address */ |
3145 | return (voidpf)(alloc->allocptr2[i]); |
3146 | } |
3147 | } |
3148 | |
3149 | /* alloc a new one */ |
3150 | ptr = (UINT32 *)malloc(size + sizeof(UINT32) + ZLIB_MIN_ALIGNMENT_BYTES); |
3151 | if (!ptr) |
3152 | return NULL; |
3153 | |
3154 | /* put it into the list */ |
3155 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
3156 | if (!alloc->allocptr[i]) |
3157 | { |
3158 | alloc->allocptr[i] = ptr; |
3159 | paddr = (((uintptr_t)ptr) + sizeof(UINT32) + (ZLIB_MIN_ALIGNMENT_BYTES-1)) & (~(ZLIB_MIN_ALIGNMENT_BYTES-1)); |
3160 | alloc->allocptr2[i] = (uint32_t*)paddr; |
3161 | break; |
3162 | } |
3163 | |
3164 | /* set the low bit of the size so we don't match next time */ |
3165 | *ptr = size | 1; |
3166 | |
3167 | /* return aligned block address */ |
3168 | return (voidpf)paddr; |
3169 | } |
3170 | |
3171 | /*------------------------------------------------- |
3172 | zlib_fast_free - fast free for ZLIB, which |
3173 | allocates and frees memory frequently |
3174 | -------------------------------------------------*/ |
3175 | |
3176 | static void zlib_fast_free(voidpf opaque, voidpf address) |
3177 | { |
3178 | zlib_allocator *alloc = (zlib_allocator *)opaque; |
3179 | UINT32 *ptr = (UINT32 *)address; |
3180 | int i; |
3181 | |
3182 | /* find the hunk */ |
3183 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
3184 | if (ptr == alloc->allocptr2[i]) |
3185 | { |
3186 | /* clear the low bit of the size to allow matches */ |
3187 | *(alloc->allocptr[i]) &= ~1; |
3188 | return; |
3189 | } |
3190 | } |
3191 | |
3192 | /*------------------------------------------------- |
3193 | zlib_allocator_free |
3194 | -------------------------------------------------*/ |
3195 | static void zlib_allocator_free(voidpf opaque) |
3196 | { |
3197 | zlib_allocator *alloc = (zlib_allocator *)opaque; |
3198 | int i; |
3199 | |
3200 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
3201 | if (alloc->allocptr[i]) |
3202 | free(alloc->allocptr[i]); |
3203 | } |
9e052883 |
3204 | |
3205 | /*------------------------------------------------- |
3206 | core_stdio_fopen - core_file wrapper over fopen |
3207 | -------------------------------------------------*/ |
3208 | static core_file *core_stdio_fopen(char const *path) { |
3209 | core_file *file = malloc(sizeof(core_file)); |
3210 | if (!file) |
3211 | return NULL; |
3212 | if (!(file->argp = fopen(path, "rb"))) { |
3213 | free(file); |
3214 | return NULL; |
3215 | } |
3216 | file->fsize = core_stdio_fsize; |
3217 | file->fread = core_stdio_fread; |
3218 | file->fclose = core_stdio_fclose; |
3219 | file->fseek = core_stdio_fseek; |
3220 | return file; |
3221 | } |
3222 | |
3223 | /*------------------------------------------------- |
3224 | core_stdio_fsize - core_file function for |
3225 | getting file size with stdio |
3226 | -------------------------------------------------*/ |
3227 | static UINT64 core_stdio_fsize(core_file *file) { |
3228 | #if defined USE_LIBRETRO_VFS |
3229 | #define core_stdio_fseek_impl fseek |
3230 | #define core_stdio_ftell_impl ftell |
3231 | #elif defined(__WIN32__) || defined(_WIN32) || defined(WIN32) || defined(__WIN64__) |
3232 | #define core_stdio_fseek_impl _fseeki64 |
3233 | #define core_stdio_ftell_impl _ftelli64 |
3234 | #elif defined(_LARGEFILE_SOURCE) && defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64 |
3235 | #define core_stdio_fseek_impl fseeko64 |
3236 | #define core_stdio_ftell_impl ftello64 |
3237 | #elif defined(__PS3__) && !defined(__PSL1GHT__) || defined(__SWITCH__) || defined(__vita__) |
3238 | #define core_stdio_fseek_impl(x,y,z) fseek(x,(off_t)y,z) |
3239 | #define core_stdio_ftell_impl(x) (off_t)ftell(x) |
3240 | #else |
3241 | #define core_stdio_fseek_impl fseeko |
3242 | #define core_stdio_ftell_impl ftello |
3243 | #endif |
3244 | FILE *fp; |
3245 | UINT64 p, rv; |
3246 | fp = (FILE*)file->argp; |
3247 | |
3248 | p = core_stdio_ftell_impl(fp); |
3249 | core_stdio_fseek_impl(fp, 0, SEEK_END); |
3250 | rv = core_stdio_ftell_impl(fp); |
3251 | core_stdio_fseek_impl(fp, p, SEEK_SET); |
3252 | return rv; |
3253 | } |
3254 | |
3255 | /*------------------------------------------------- |
3256 | core_stdio_fread - core_file wrapper over fread |
3257 | -------------------------------------------------*/ |
3258 | static size_t core_stdio_fread(void *ptr, size_t size, size_t nmemb, core_file *file) { |
3259 | return fread(ptr, size, nmemb, (FILE*)file->argp); |
3260 | } |
3261 | |
3262 | /*------------------------------------------------- |
3263 | core_stdio_fclose - core_file wrapper over fclose |
3264 | -------------------------------------------------*/ |
3265 | static int core_stdio_fclose(core_file *file) { |
3266 | int err = fclose((FILE*)file->argp); |
3267 | if (err == 0) |
3268 | free(file); |
3269 | return err; |
3270 | } |
3271 | |
3272 | /*------------------------------------------------- |
3273 | core_stdio_fclose_nonowner - don't call fclose because |
3274 | we don't own the underlying file, but do free the |
3275 | core_file because libchdr did allocate that itself. |
3276 | -------------------------------------------------*/ |
3277 | static int core_stdio_fclose_nonowner(core_file *file) { |
3278 | free(file); |
3279 | return 0; |
3280 | } |
3281 | |
3282 | /*------------------------------------------------- |
3283 | core_stdio_fseek - core_file wrapper over fclose |
3284 | -------------------------------------------------*/ |
3285 | static int core_stdio_fseek(core_file* file, INT64 offset, int whence) { |
3286 | return core_stdio_fseek_impl((FILE*)file->argp, offset, whence); |
3287 | } |