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