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