ce188d4d |
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 | ***************************************************************************/ |
ce188d4d |
39 | |
9c659ffe |
40 | #include <stddef.h> |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | #include <time.h> |
ce188d4d |
45 | #include "chd.h" |
46 | #include "cdrom.h" |
ce188d4d |
47 | #include "flac.h" |
9c659ffe |
48 | #include "huffman.h" |
ce188d4d |
49 | #include "LzmaEnc.h" |
50 | #include "LzmaDec.h" |
9c659ffe |
51 | #include "md5.h" |
52 | #include "sha1.h" |
53 | #include "zlib.h" |
ce188d4d |
54 | |
55 | #define TRUE 1 |
56 | #define FALSE 0 |
57 | |
58 | #define MAX(x, y) (((x) > (y)) ? (x) : (y)) |
59 | #define MIN(x, y) (((x) < (y)) ? (x) : (y)) |
60 | |
61 | #define SHA1_DIGEST_SIZE 20 |
62 | |
ce188d4d |
63 | /*************************************************************************** |
64 | DEBUGGING |
65 | ***************************************************************************/ |
66 | |
67 | #define PRINTF_MAX_HUNK (0) |
68 | |
ce188d4d |
69 | /*************************************************************************** |
70 | CONSTANTS |
71 | ***************************************************************************/ |
72 | |
73 | #define MAP_STACK_ENTRIES 512 /* max number of entries to use on the stack */ |
74 | #define MAP_ENTRY_SIZE 16 /* V3 and later */ |
75 | #define OLD_MAP_ENTRY_SIZE 8 /* V1-V2 */ |
76 | #define METADATA_HEADER_SIZE 16 /* metadata header size */ |
77 | #define CRCMAP_HASH_SIZE 4095 /* number of CRC hashtable entries */ |
78 | |
79 | #define MAP_ENTRY_FLAG_TYPE_MASK 0x0f /* what type of hunk */ |
80 | #define MAP_ENTRY_FLAG_NO_CRC 0x10 /* no CRC is present */ |
81 | |
82 | #define CHD_V1_SECTOR_SIZE 512 /* size of a "sector" in the V1 header */ |
83 | |
84 | #define COOKIE_VALUE 0xbaadf00d |
85 | #define MAX_ZLIB_ALLOCS 64 |
86 | |
87 | #define END_OF_LIST_COOKIE "EndOfListCookie" |
88 | |
89 | #define NO_MATCH (~0) |
90 | |
91 | static const uint8_t s_cd_sync_header[12] = { 0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00 }; |
92 | |
9c659ffe |
93 | /* V3-V4 entry types */ |
ce188d4d |
94 | enum |
95 | { |
9c659ffe |
96 | V34_MAP_ENTRY_TYPE_INVALID = 0, /* invalid type */ |
97 | V34_MAP_ENTRY_TYPE_COMPRESSED = 1, /* standard compression */ |
98 | V34_MAP_ENTRY_TYPE_UNCOMPRESSED = 2, /* uncompressed data */ |
99 | V34_MAP_ENTRY_TYPE_MINI = 3, /* mini: use offset as raw data */ |
100 | V34_MAP_ENTRY_TYPE_SELF_HUNK = 4, /* same as another hunk in this file */ |
101 | V34_MAP_ENTRY_TYPE_PARENT_HUNK = 5, /* same as a hunk in the parent file */ |
102 | V34_MAP_ENTRY_TYPE_2ND_COMPRESSED = 6 /* compressed with secondary algorithm (usually FLAC CDDA) */ |
ce188d4d |
103 | }; |
104 | |
9c659ffe |
105 | /* V5 compression types */ |
ce188d4d |
106 | enum |
107 | { |
9c659ffe |
108 | /* codec #0 |
109 | * these types are live when running */ |
ce188d4d |
110 | COMPRESSION_TYPE_0 = 0, |
9c659ffe |
111 | /* codec #1 */ |
ce188d4d |
112 | COMPRESSION_TYPE_1 = 1, |
9c659ffe |
113 | /* codec #2 */ |
ce188d4d |
114 | COMPRESSION_TYPE_2 = 2, |
9c659ffe |
115 | /* codec #3 */ |
ce188d4d |
116 | COMPRESSION_TYPE_3 = 3, |
9c659ffe |
117 | /* no compression; implicit length = hunkbytes */ |
ce188d4d |
118 | COMPRESSION_NONE = 4, |
9c659ffe |
119 | /* same as another block in this chd */ |
ce188d4d |
120 | COMPRESSION_SELF = 5, |
9c659ffe |
121 | /* same as a hunk's worth of units in the parent chd */ |
ce188d4d |
122 | COMPRESSION_PARENT = 6, |
123 | |
9c659ffe |
124 | /* start of small RLE run (4-bit length) |
125 | * these additional pseudo-types are used for compressed encodings: */ |
ce188d4d |
126 | COMPRESSION_RLE_SMALL, |
9c659ffe |
127 | /* start of large RLE run (8-bit length) */ |
ce188d4d |
128 | COMPRESSION_RLE_LARGE, |
9c659ffe |
129 | /* same as the last COMPRESSION_SELF block */ |
ce188d4d |
130 | COMPRESSION_SELF_0, |
9c659ffe |
131 | /* same as the last COMPRESSION_SELF block + 1 */ |
ce188d4d |
132 | COMPRESSION_SELF_1, |
9c659ffe |
133 | /* same block in the parent */ |
ce188d4d |
134 | COMPRESSION_PARENT_SELF, |
9c659ffe |
135 | /* same as the last COMPRESSION_PARENT block */ |
ce188d4d |
136 | COMPRESSION_PARENT_0, |
9c659ffe |
137 | /* same as the last COMPRESSION_PARENT block + 1 */ |
ce188d4d |
138 | COMPRESSION_PARENT_1 |
139 | }; |
140 | |
ce188d4d |
141 | /*************************************************************************** |
142 | MACROS |
143 | ***************************************************************************/ |
144 | |
145 | #define EARLY_EXIT(x) do { (void)(x); goto cleanup; } while (0) |
146 | |
ce188d4d |
147 | /*************************************************************************** |
148 | TYPE DEFINITIONS |
149 | ***************************************************************************/ |
150 | |
151 | /* interface to a codec */ |
152 | typedef struct _codec_interface codec_interface; |
153 | struct _codec_interface |
154 | { |
155 | UINT32 compression; /* type of compression */ |
156 | const char *compname; /* name of the algorithm */ |
157 | UINT8 lossy; /* is this a lossy algorithm? */ |
158 | chd_error (*init)(void *codec, UINT32 hunkbytes); /* codec initialize */ |
159 | void (*free)(void *codec); /* codec free */ |
160 | chd_error (*decompress)(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); /* decompress data */ |
161 | chd_error (*config)(void *codec, int param, void *config); /* configure */ |
162 | }; |
163 | |
ce188d4d |
164 | /* a single map entry */ |
165 | typedef struct _map_entry map_entry; |
166 | struct _map_entry |
167 | { |
168 | UINT64 offset; /* offset within the file of the data */ |
169 | UINT32 crc; /* 32-bit CRC of the data */ |
170 | UINT32 length; /* length of the data */ |
171 | UINT8 flags; /* misc flags */ |
172 | }; |
173 | |
ce188d4d |
174 | /* simple linked-list of hunks used for our CRC map */ |
175 | typedef struct _crcmap_entry crcmap_entry; |
176 | struct _crcmap_entry |
177 | { |
178 | UINT32 hunknum; /* hunk number */ |
179 | crcmap_entry * next; /* next entry in list */ |
180 | }; |
181 | |
ce188d4d |
182 | /* a single metadata entry */ |
183 | typedef struct _metadata_entry metadata_entry; |
184 | struct _metadata_entry |
185 | { |
186 | UINT64 offset; /* offset within the file of the header */ |
187 | UINT64 next; /* offset within the file of the next header */ |
188 | UINT64 prev; /* offset within the file of the previous header */ |
189 | UINT32 length; /* length of the metadata */ |
190 | UINT32 metatag; /* metadata tag */ |
191 | UINT8 flags; /* flag bits */ |
192 | }; |
193 | |
194 | /* codec-private data for the ZLIB codec */ |
195 | |
196 | typedef struct _zlib_allocator zlib_allocator; |
197 | struct _zlib_allocator |
198 | { |
199 | UINT32 * allocptr[MAX_ZLIB_ALLOCS]; |
200 | }; |
201 | |
202 | typedef struct _zlib_codec_data zlib_codec_data; |
203 | struct _zlib_codec_data |
204 | { |
205 | z_stream inflater; |
206 | zlib_allocator allocator; |
207 | }; |
208 | |
209 | /* codec-private data for the LZMA codec */ |
210 | #define MAX_LZMA_ALLOCS 64 |
211 | |
212 | typedef struct _lzma_allocator lzma_allocator; |
213 | struct _lzma_allocator |
214 | { |
215 | void *(*Alloc)(void *p, size_t size); |
216 | void (*Free)(void *p, void *address); /* address can be 0 */ |
217 | void (*FreeSz)(void *p, void *address, size_t size); /* address can be 0 */ |
218 | uint32_t* allocptr[MAX_LZMA_ALLOCS]; |
219 | }; |
220 | |
221 | typedef struct _lzma_codec_data lzma_codec_data; |
9c659ffe |
222 | struct _lzma_codec_data |
ce188d4d |
223 | { |
224 | CLzmaDec decoder; |
225 | lzma_allocator allocator; |
226 | }; |
227 | |
228 | /* codec-private data for the CDZL codec */ |
229 | typedef struct _cdzl_codec_data cdzl_codec_data; |
230 | struct _cdzl_codec_data { |
9c659ffe |
231 | /* internal state */ |
ce188d4d |
232 | zlib_codec_data base_decompressor; |
233 | zlib_codec_data subcode_decompressor; |
234 | uint8_t* buffer; |
235 | }; |
236 | |
237 | /* codec-private data for the CDLZ codec */ |
238 | typedef struct _cdlz_codec_data cdlz_codec_data; |
239 | struct _cdlz_codec_data { |
9c659ffe |
240 | /* internal state */ |
ce188d4d |
241 | lzma_codec_data base_decompressor; |
242 | zlib_codec_data subcode_decompressor; |
243 | uint8_t* buffer; |
244 | }; |
245 | |
246 | /* codec-private data for the CDFL codec */ |
247 | typedef struct _cdfl_codec_data cdfl_codec_data; |
248 | struct _cdfl_codec_data { |
9c659ffe |
249 | /* internal state */ |
ce188d4d |
250 | int swap_endian; |
251 | flac_decoder decoder; |
252 | z_stream inflater; |
253 | zlib_allocator allocator; |
254 | uint8_t* buffer; |
255 | }; |
256 | |
257 | /* internal representation of an open CHD file */ |
258 | struct _chd_file |
259 | { |
260 | UINT32 cookie; /* cookie, should equal COOKIE_VALUE */ |
261 | |
262 | core_file * file; /* handle to the open core file */ |
263 | UINT8 owns_file; /* flag indicating if this file should be closed on chd_close() */ |
264 | chd_header header; /* header, extracted from file */ |
265 | |
266 | chd_file * parent; /* pointer to parent file, or NULL */ |
267 | |
268 | map_entry * map; /* array of map entries */ |
269 | |
270 | UINT8 * cache; /* hunk cache pointer */ |
271 | UINT32 cachehunk; /* index of currently cached hunk */ |
272 | |
273 | UINT8 * compare; /* hunk compare pointer */ |
274 | UINT32 comparehunk; /* index of current compare data */ |
275 | |
276 | UINT8 * compressed; /* pointer to buffer for compressed data */ |
277 | const codec_interface * codecintf[4]; /* interface to the codec */ |
278 | |
279 | zlib_codec_data zlib_codec_data; /* zlib codec data */ |
280 | cdzl_codec_data cdzl_codec_data; /* cdzl codec data */ |
281 | cdlz_codec_data cdlz_codec_data; /* cdlz codec data */ |
282 | cdfl_codec_data cdfl_codec_data; /* cdfl codec data */ |
283 | |
284 | crcmap_entry * crcmap; /* CRC map entries */ |
285 | crcmap_entry * crcfree; /* free list CRC entries */ |
286 | crcmap_entry ** crctable; /* table of CRC entries */ |
287 | |
288 | UINT32 maxhunk; /* maximum hunk accessed */ |
289 | |
290 | UINT8 compressing; /* are we compressing? */ |
291 | MD5_CTX compmd5; /* running MD5 during compression */ |
292 | SHA1_CTX compsha1; /* running SHA1 during compression */ |
293 | UINT32 comphunk; /* next hunk we will compress */ |
294 | |
295 | UINT8 verifying; /* are we verifying? */ |
296 | MD5_CTX vermd5; /* running MD5 during verification */ |
297 | SHA1_CTX versha1; /* running SHA1 during verification */ |
298 | UINT32 verhunk; /* next hunk we will verify */ |
299 | |
300 | UINT32 async_hunknum; /* hunk index for asynchronous operations */ |
301 | void * async_buffer; /* buffer pointer for asynchronous operations */ |
302 | |
9c659ffe |
303 | UINT8 * file_cache; /* cache of underlying file */ |
ce188d4d |
304 | }; |
305 | |
ce188d4d |
306 | /* a single metadata hash entry */ |
307 | typedef struct _metadata_hash metadata_hash; |
308 | struct _metadata_hash |
309 | { |
310 | UINT8 tag[4]; /* tag of the metadata in big-endian */ |
311 | UINT8 sha1[CHD_SHA1_BYTES]; /* hash */ |
312 | }; |
313 | |
ce188d4d |
314 | /*************************************************************************** |
315 | GLOBAL VARIABLES |
316 | ***************************************************************************/ |
317 | |
318 | static const UINT8 nullmd5[CHD_MD5_BYTES] = { 0 }; |
319 | static const UINT8 nullsha1[CHD_SHA1_BYTES] = { 0 }; |
320 | |
ce188d4d |
321 | /*************************************************************************** |
322 | PROTOTYPES |
323 | ***************************************************************************/ |
324 | |
325 | /* internal header operations */ |
326 | static chd_error header_validate(const chd_header *header); |
9c659ffe |
327 | static chd_error header_read(chd_file *chd, chd_header *header); |
ce188d4d |
328 | |
329 | /* internal hunk read/write */ |
330 | static chd_error hunk_read_into_cache(chd_file *chd, UINT32 hunknum); |
331 | static chd_error hunk_read_into_memory(chd_file *chd, UINT32 hunknum, UINT8 *dest); |
332 | |
333 | /* internal map access */ |
334 | static chd_error map_read(chd_file *chd); |
335 | |
336 | /* metadata management */ |
337 | static chd_error metadata_find_entry(chd_file *chd, UINT32 metatag, UINT32 metaindex, metadata_entry *metaentry); |
338 | |
ce188d4d |
339 | /* zlib compression codec */ |
340 | static chd_error zlib_codec_init(void *codec, uint32_t hunkbytes); |
341 | static void zlib_codec_free(void *codec); |
342 | static chd_error zlib_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
343 | static voidpf zlib_fast_alloc(voidpf opaque, uInt items, uInt size); |
344 | static void zlib_fast_free(voidpf opaque, voidpf address); |
345 | |
346 | /* lzma compression codec */ |
347 | static chd_error lzma_codec_init(void *codec, uint32_t hunkbytes); |
348 | static void lzma_codec_free(void *codec); |
349 | static chd_error lzma_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
350 | |
351 | /* cdzl compression codec */ |
352 | static chd_error cdzl_codec_init(void* codec, uint32_t hunkbytes); |
353 | static void cdzl_codec_free(void* codec); |
354 | static chd_error cdzl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
355 | |
356 | /* cdlz compression codec */ |
357 | static chd_error cdlz_codec_init(void* codec, uint32_t hunkbytes); |
358 | static void cdlz_codec_free(void* codec); |
359 | static chd_error cdlz_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
360 | |
361 | /* cdfl compression codec */ |
362 | static chd_error cdfl_codec_init(void* codec, uint32_t hunkbytes); |
363 | static void cdfl_codec_free(void* codec); |
364 | static chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen); |
365 | |
9c659ffe |
366 | /*************************************************************************** |
367 | * LZMA ALLOCATOR HELPER |
368 | *************************************************************************** |
369 | */ |
ce188d4d |
370 | |
371 | void *lzma_fast_alloc(void *p, size_t size); |
372 | void lzma_fast_free(void *p, void *address); |
373 | |
9c659ffe |
374 | /*------------------------------------------------- |
375 | * lzma_allocator_init |
376 | *------------------------------------------------- |
377 | */ |
ce188d4d |
378 | |
379 | void lzma_allocator_init(void* p) |
380 | { |
381 | lzma_allocator *codec = (lzma_allocator *)(p); |
382 | |
9c659ffe |
383 | /* reset pointer list */ |
ce188d4d |
384 | memset(codec->allocptr, 0, sizeof(codec->allocptr)); |
385 | codec->Alloc = lzma_fast_alloc; |
386 | codec->Free = lzma_fast_free; |
387 | } |
388 | |
9c659ffe |
389 | /*------------------------------------------------- |
390 | * lzma_allocator_free |
391 | *------------------------------------------------- |
392 | */ |
ce188d4d |
393 | |
394 | void lzma_allocator_free(void* p ) |
395 | { |
ce188d4d |
396 | lzma_allocator *codec = (lzma_allocator *)(p); |
397 | |
9c659ffe |
398 | /* free our memory */ |
399 | for (int i = 0 ; i < MAX_LZMA_ALLOCS ; i++) |
ce188d4d |
400 | { |
401 | if (codec->allocptr[i] != NULL) |
402 | free(codec->allocptr[i]); |
403 | } |
404 | } |
405 | |
9c659ffe |
406 | /*------------------------------------------------- |
407 | * lzma_fast_alloc - fast malloc for lzma, which |
408 | * allocates and frees memory frequently |
409 | *------------------------------------------------- |
410 | */ |
ce188d4d |
411 | |
412 | void *lzma_fast_alloc(void *p, size_t size) |
413 | { |
ce188d4d |
414 | lzma_allocator *codec = (lzma_allocator *)(p); |
415 | |
9c659ffe |
416 | /* compute the size, rounding to the nearest 1k */ |
ce188d4d |
417 | size = (size + 0x3ff) & ~0x3ff; |
418 | |
9c659ffe |
419 | /* reuse a hunk if we can */ |
420 | for (int scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
ce188d4d |
421 | { |
422 | uint32_t *ptr = codec->allocptr[scan]; |
423 | if (ptr != NULL && size == *ptr) |
424 | { |
9c659ffe |
425 | /* set the low bit of the size so we don't match next time */ |
ce188d4d |
426 | *ptr |= 1; |
427 | return ptr + 1; |
428 | } |
429 | } |
430 | |
9c659ffe |
431 | /* alloc a new one and put it into the list */ |
432 | uint32_t *addr = (uint32_t *)malloc(sizeof(uint8_t) * size + sizeof(uintptr_t)); |
ce188d4d |
433 | if (addr==NULL) |
434 | return NULL; |
9c659ffe |
435 | for (int scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
ce188d4d |
436 | { |
437 | if (codec->allocptr[scan] == NULL) |
438 | { |
439 | codec->allocptr[scan] = addr; |
440 | break; |
441 | } |
442 | } |
443 | |
9c659ffe |
444 | /* set the low bit of the size so we don't match next time */ |
ce188d4d |
445 | *addr = size | 1; |
9c659ffe |
446 | return addr + (sizeof(uint32_t) == sizeof(uintptr_t) ? 1 : 2); |
ce188d4d |
447 | } |
448 | |
9c659ffe |
449 | /*------------------------------------------------- |
450 | * lzma_fast_free - fast free for lzma, which |
451 | * allocates and frees memory frequently |
452 | *------------------------------------------------- |
453 | */ |
ce188d4d |
454 | |
455 | void lzma_fast_free(void *p, void *address) |
456 | { |
ce188d4d |
457 | if (address == NULL) |
458 | return; |
459 | |
9c659ffe |
460 | lzma_allocator *codec = (lzma_allocator *)(p); |
ce188d4d |
461 | |
9c659ffe |
462 | /* find the hunk */ |
463 | uint32_t *ptr = (uint32_t *)(address) - 1; |
464 | for (int scan = 0; scan < MAX_LZMA_ALLOCS; scan++) |
ce188d4d |
465 | { |
466 | if (ptr == codec->allocptr[scan]) |
467 | { |
9c659ffe |
468 | /* clear the low bit of the size to allow matches */ |
ce188d4d |
469 | *ptr &= ~1; |
470 | return; |
471 | } |
472 | } |
473 | } |
474 | |
9c659ffe |
475 | /*************************************************************************** |
476 | * LZMA DECOMPRESSOR |
477 | *************************************************************************** |
478 | */ |
ce188d4d |
479 | |
9c659ffe |
480 | /*------------------------------------------------- |
481 | * lzma_codec_init - constructor |
482 | *------------------------------------------------- |
483 | */ |
ce188d4d |
484 | |
485 | chd_error lzma_codec_init(void* codec, uint32_t hunkbytes) |
486 | { |
ce188d4d |
487 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
488 | |
9c659ffe |
489 | /* construct the decoder */ |
ce188d4d |
490 | LzmaDec_Construct(&lzma_codec->decoder); |
491 | |
9c659ffe |
492 | /* FIXME: this code is written in a way that makes it impossible to safely upgrade the LZMA SDK |
493 | * This code assumes that the current version of the encoder imposes the same requirements on the |
494 | * decoder as the encoder used to produce the file. This is not necessarily true. The format |
495 | * needs to be changed so the encoder properties are written to the file. |
ce188d4d |
496 | |
9c659ffe |
497 | * configure the properties like the compressor did */ |
498 | CLzmaEncProps encoder_props; |
ce188d4d |
499 | LzmaEncProps_Init(&encoder_props); |
500 | encoder_props.level = 9; |
501 | encoder_props.reduceSize = hunkbytes; |
502 | LzmaEncProps_Normalize(&encoder_props); |
503 | |
9c659ffe |
504 | /* convert to decoder properties */ |
505 | lzma_allocator* alloc = &lzma_codec->allocator; |
ce188d4d |
506 | lzma_allocator_init(alloc); |
9c659ffe |
507 | CLzmaEncHandle enc = LzmaEnc_Create((ISzAlloc*)alloc); |
ce188d4d |
508 | if (!enc) |
509 | return CHDERR_DECOMPRESSION_ERROR; |
510 | if (LzmaEnc_SetProps(enc, &encoder_props) != SZ_OK) |
511 | { |
512 | LzmaEnc_Destroy(enc, (ISzAlloc*)&alloc, (ISzAlloc*)&alloc); |
513 | return CHDERR_DECOMPRESSION_ERROR; |
514 | } |
9c659ffe |
515 | Byte decoder_props[LZMA_PROPS_SIZE]; |
516 | SizeT props_size = sizeof(decoder_props); |
ce188d4d |
517 | if (LzmaEnc_WriteProperties(enc, decoder_props, &props_size) != SZ_OK) |
518 | { |
519 | LzmaEnc_Destroy(enc, (ISzAlloc*)alloc, (ISzAlloc*)alloc); |
520 | return CHDERR_DECOMPRESSION_ERROR; |
521 | } |
522 | LzmaEnc_Destroy(enc, (ISzAlloc*)alloc, (ISzAlloc*)alloc); |
523 | |
9c659ffe |
524 | /* do memory allocations */ |
ce188d4d |
525 | if (LzmaDec_Allocate(&lzma_codec->decoder, decoder_props, LZMA_PROPS_SIZE, (ISzAlloc*)alloc) != SZ_OK) |
526 | return CHDERR_DECOMPRESSION_ERROR; |
9c659ffe |
527 | |
528 | /* Okay */ |
ce188d4d |
529 | return CHDERR_NONE; |
530 | } |
531 | |
9c659ffe |
532 | /*------------------------------------------------- |
533 | * lzma_codec_free |
534 | *------------------------------------------------- |
535 | */ |
ce188d4d |
536 | |
537 | void lzma_codec_free(void* codec) |
538 | { |
539 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
540 | |
9c659ffe |
541 | /* free memory */ |
ce188d4d |
542 | LzmaDec_Free(&lzma_codec->decoder, (ISzAlloc*)&lzma_codec->allocator); |
9c659ffe |
543 | lzma_allocator_free(&lzma_codec->allocator); |
ce188d4d |
544 | } |
545 | |
9c659ffe |
546 | /*------------------------------------------------- |
547 | * decompress - decompress data using the LZMA |
548 | * codec |
549 | *------------------------------------------------- |
550 | */ |
ce188d4d |
551 | |
552 | chd_error lzma_codec_decompress(void* codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
553 | { |
9c659ffe |
554 | /* initialize */ |
ce188d4d |
555 | lzma_codec_data* lzma_codec = (lzma_codec_data*) codec; |
556 | LzmaDec_Init(&lzma_codec->decoder); |
557 | |
9c659ffe |
558 | /* decode */ |
559 | SizeT consumedlen = complen; |
560 | SizeT decodedlen = destlen; |
561 | ELzmaStatus status; |
562 | SRes res = LzmaDec_DecodeToBuf(&lzma_codec->decoder, dest, &decodedlen, src, &consumedlen, LZMA_FINISH_END, &status); |
ce188d4d |
563 | if ((res != SZ_OK && res != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK) || consumedlen != complen || decodedlen != destlen) |
564 | return CHDERR_DECOMPRESSION_ERROR; |
565 | return CHDERR_NONE; |
566 | } |
567 | |
9c659ffe |
568 | /* cdlz */ |
ce188d4d |
569 | chd_error cdlz_codec_init(void* codec, uint32_t hunkbytes) |
570 | { |
571 | cdlz_codec_data* cdlz = (cdlz_codec_data*) codec; |
572 | |
9c659ffe |
573 | /* allocate buffer */ |
ce188d4d |
574 | cdlz->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
9c659ffe |
575 | |
576 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
ce188d4d |
577 | lzma_codec_init(&cdlz->base_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
578 | zlib_codec_init(&cdlz->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SUBCODE_DATA); |
579 | |
580 | if (hunkbytes % CD_FRAME_SIZE != 0) |
581 | return CHDERR_CODEC_ERROR; |
582 | |
583 | return CHDERR_NONE; |
584 | } |
585 | |
586 | void cdlz_codec_free(void* codec) |
587 | { |
9c659ffe |
588 | cdlz_codec_data* cdlz = (cdlz_codec_data*) codec; |
589 | free(cdlz->buffer); |
590 | lzma_codec_free(&cdlz->base_decompressor); |
591 | zlib_codec_free(&cdlz->subcode_decompressor); |
ce188d4d |
592 | } |
593 | |
594 | chd_error cdlz_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
595 | { |
9c659ffe |
596 | uint8_t *sector; |
ce188d4d |
597 | cdlz_codec_data* cdlz = (cdlz_codec_data*)codec; |
598 | |
9c659ffe |
599 | /* determine header bytes */ |
ce188d4d |
600 | uint32_t frames = destlen / CD_FRAME_SIZE; |
601 | uint32_t complen_bytes = (destlen < 65536) ? 2 : 3; |
602 | uint32_t ecc_bytes = (frames + 7) / 8; |
603 | uint32_t header_bytes = ecc_bytes + complen_bytes; |
604 | |
9c659ffe |
605 | /* extract compressed length of base */ |
ce188d4d |
606 | uint32_t complen_base = (src[ecc_bytes + 0] << 8) | src[ecc_bytes + 1]; |
607 | if (complen_bytes > 2) |
608 | complen_base = (complen_base << 8) | src[ecc_bytes + 2]; |
609 | |
9c659ffe |
610 | /* reset and decode */ |
ce188d4d |
611 | lzma_codec_decompress(&cdlz->base_decompressor, &src[header_bytes], complen_base, &cdlz->buffer[0], frames * CD_MAX_SECTOR_DATA); |
612 | 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); |
613 | |
9c659ffe |
614 | /* reassemble the data */ |
615 | for (uint32_t framenum = 0; framenum < frames; framenum++) |
ce188d4d |
616 | { |
ce188d4d |
617 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdlz->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
618 | 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); |
619 | |
9c659ffe |
620 | /* reconstitute the ECC data and sync header */ |
621 | sector = (uint8_t *)&dest[framenum * CD_FRAME_SIZE]; |
ce188d4d |
622 | if ((src[framenum / 8] & (1 << (framenum % 8))) != 0) |
623 | { |
624 | memcpy(sector, s_cd_sync_header, sizeof(s_cd_sync_header)); |
625 | ecc_generate(sector); |
626 | } |
627 | } |
628 | return CHDERR_NONE; |
629 | } |
630 | |
9c659ffe |
631 | /* cdzl */ |
ce188d4d |
632 | |
633 | chd_error cdzl_codec_init(void *codec, uint32_t hunkbytes) |
634 | { |
635 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
636 | |
9c659ffe |
637 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
ce188d4d |
638 | zlib_codec_init(&cdzl->base_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SECTOR_DATA); |
639 | zlib_codec_init(&cdzl->subcode_decompressor, (hunkbytes / CD_FRAME_SIZE) * CD_MAX_SUBCODE_DATA); |
640 | |
641 | cdzl->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
642 | if (hunkbytes % CD_FRAME_SIZE != 0) |
643 | return CHDERR_CODEC_ERROR; |
644 | |
645 | return CHDERR_NONE; |
646 | } |
647 | |
648 | void cdzl_codec_free(void *codec) |
649 | { |
9c659ffe |
650 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
651 | zlib_codec_free(&cdzl->base_decompressor); |
652 | zlib_codec_free(&cdzl->subcode_decompressor); |
653 | free(cdzl->buffer); |
ce188d4d |
654 | } |
655 | |
656 | chd_error cdzl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
657 | { |
9c659ffe |
658 | uint8_t *sector; |
ce188d4d |
659 | cdzl_codec_data* cdzl = (cdzl_codec_data*)codec; |
9c659ffe |
660 | |
661 | /* determine header bytes */ |
ce188d4d |
662 | uint32_t frames = destlen / CD_FRAME_SIZE; |
663 | uint32_t complen_bytes = (destlen < 65536) ? 2 : 3; |
664 | uint32_t ecc_bytes = (frames + 7) / 8; |
665 | uint32_t header_bytes = ecc_bytes + complen_bytes; |
666 | |
9c659ffe |
667 | /* extract compressed length of base */ |
ce188d4d |
668 | uint32_t complen_base = (src[ecc_bytes + 0] << 8) | src[ecc_bytes + 1]; |
669 | if (complen_bytes > 2) |
670 | complen_base = (complen_base << 8) | src[ecc_bytes + 2]; |
671 | |
9c659ffe |
672 | /* reset and decode */ |
ce188d4d |
673 | zlib_codec_decompress(&cdzl->base_decompressor, &src[header_bytes], complen_base, &cdzl->buffer[0], frames * CD_MAX_SECTOR_DATA); |
674 | 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); |
675 | |
9c659ffe |
676 | /* reassemble the data */ |
677 | for (uint32_t framenum = 0; framenum < frames; framenum++) |
ce188d4d |
678 | { |
ce188d4d |
679 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdzl->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
680 | 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); |
681 | |
9c659ffe |
682 | /* reconstitute the ECC data and sync header */ |
683 | sector = (uint8_t *)&dest[framenum * CD_FRAME_SIZE]; |
ce188d4d |
684 | if ((src[framenum / 8] & (1 << (framenum % 8))) != 0) |
685 | { |
686 | memcpy(sector, s_cd_sync_header, sizeof(s_cd_sync_header)); |
687 | ecc_generate(sector); |
688 | } |
689 | } |
690 | return CHDERR_NONE; |
691 | } |
692 | |
9c659ffe |
693 | /*************************************************************************** |
694 | * CD FLAC DECOMPRESSOR |
695 | *************************************************************************** |
696 | */ |
ce188d4d |
697 | |
9c659ffe |
698 | /*------------------------------------------------------ |
699 | * cdfl_codec_blocksize - return the optimal block size |
700 | *------------------------------------------------------ |
701 | */ |
ce188d4d |
702 | |
703 | static uint32_t cdfl_codec_blocksize(uint32_t bytes) |
704 | { |
9c659ffe |
705 | /* determine FLAC block size, which must be 16-65535 |
706 | * clamp to 2k since that's supposed to be the sweet spot */ |
ce188d4d |
707 | uint32_t hunkbytes = bytes / 4; |
708 | while (hunkbytes > 2048) |
709 | hunkbytes /= 2; |
710 | return hunkbytes; |
711 | } |
712 | |
713 | chd_error cdfl_codec_init(void *codec, uint32_t hunkbytes) |
714 | { |
ce188d4d |
715 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
716 | |
717 | cdfl->buffer = (uint8_t*)malloc(sizeof(uint8_t) * hunkbytes); |
718 | |
9c659ffe |
719 | /* make sure the CHD's hunk size is an even multiple of the frame size */ |
ce188d4d |
720 | if (hunkbytes % CD_FRAME_SIZE != 0) |
721 | return CHDERR_CODEC_ERROR; |
722 | |
9c659ffe |
723 | /* determine whether we want native or swapped samples */ |
724 | uint16_t native_endian = 0; |
ce188d4d |
725 | *(uint8_t *)(&native_endian) = 1; |
726 | cdfl->swap_endian = (native_endian & 1); |
727 | |
9c659ffe |
728 | /* init the inflater */ |
729 | cdfl->inflater.next_in = (Bytef *)cdfl; /* bogus, but that's ok */ |
ce188d4d |
730 | cdfl->inflater.avail_in = 0; |
9c659ffe |
731 | #if 0 |
732 | cdfl->allocator.install(cdfl->inflater); |
733 | #endif |
ce188d4d |
734 | cdfl->inflater.zalloc = zlib_fast_alloc; |
735 | cdfl->inflater.zfree = zlib_fast_free; |
736 | cdfl->inflater.opaque = &cdfl->allocator; |
9c659ffe |
737 | int zerr = inflateInit2(&cdfl->inflater, -MAX_WBITS); |
ce188d4d |
738 | |
9c659ffe |
739 | /* convert errors */ |
ce188d4d |
740 | if (zerr == Z_MEM_ERROR) |
741 | return CHDERR_OUT_OF_MEMORY; |
742 | else if (zerr != Z_OK) |
743 | return CHDERR_CODEC_ERROR; |
744 | |
9c659ffe |
745 | /* flac decoder init */ |
ce188d4d |
746 | flac_decoder_init(&cdfl->decoder); |
ce188d4d |
747 | return CHDERR_NONE; |
748 | } |
749 | |
750 | void cdfl_codec_free(void *codec) |
751 | { |
752 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
9c659ffe |
753 | free(cdfl->buffer); |
ce188d4d |
754 | inflateEnd(&cdfl->inflater); |
9c659ffe |
755 | flac_decoder_free(&cdfl->decoder); |
ce188d4d |
756 | } |
757 | |
758 | chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
759 | { |
ce188d4d |
760 | cdfl_codec_data *cdfl = (cdfl_codec_data*)codec; |
761 | |
9c659ffe |
762 | /* reset and decode */ |
ce188d4d |
763 | uint32_t frames = destlen / CD_FRAME_SIZE; |
9c659ffe |
764 | |
ce188d4d |
765 | if (!flac_decoder_reset(&cdfl->decoder, 44100, 2, cdfl_codec_blocksize(frames * CD_MAX_SECTOR_DATA), src, complen)) |
766 | return CHDERR_DECOMPRESSION_ERROR; |
9c659ffe |
767 | uint8_t *buffer = &cdfl->buffer[0]; |
ce188d4d |
768 | if (!flac_decoder_decode_interleaved(&cdfl->decoder, (int16_t *)(buffer), frames * CD_MAX_SECTOR_DATA/4, cdfl->swap_endian)) |
769 | return CHDERR_DECOMPRESSION_ERROR; |
770 | |
9c659ffe |
771 | /* inflate the subcode data */ |
772 | uint32_t offset = flac_decoder_finish(&cdfl->decoder); |
ce188d4d |
773 | cdfl->inflater.next_in = (Bytef *)(src + offset); |
774 | cdfl->inflater.avail_in = complen - offset; |
775 | cdfl->inflater.total_in = 0; |
776 | cdfl->inflater.next_out = &cdfl->buffer[frames * CD_MAX_SECTOR_DATA]; |
777 | cdfl->inflater.avail_out = frames * CD_MAX_SUBCODE_DATA; |
778 | cdfl->inflater.total_out = 0; |
9c659ffe |
779 | int zerr = inflateReset(&cdfl->inflater); |
ce188d4d |
780 | if (zerr != Z_OK) |
781 | return CHDERR_DECOMPRESSION_ERROR; |
782 | |
9c659ffe |
783 | /* do it */ |
ce188d4d |
784 | zerr = inflate(&cdfl->inflater, Z_FINISH); |
785 | if (zerr != Z_STREAM_END) |
786 | return CHDERR_DECOMPRESSION_ERROR; |
787 | if (cdfl->inflater.total_out != frames * CD_MAX_SUBCODE_DATA) |
788 | return CHDERR_DECOMPRESSION_ERROR; |
789 | |
9c659ffe |
790 | /* reassemble the data */ |
791 | for (uint32_t framenum = 0; framenum < frames; framenum++) |
ce188d4d |
792 | { |
793 | memcpy(&dest[framenum * CD_FRAME_SIZE], &cdfl->buffer[framenum * CD_MAX_SECTOR_DATA], CD_MAX_SECTOR_DATA); |
794 | 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); |
795 | } |
796 | |
797 | return CHDERR_NONE; |
798 | } |
799 | /*************************************************************************** |
800 | CODEC INTERFACES |
801 | ***************************************************************************/ |
802 | |
ce188d4d |
803 | static const codec_interface codec_interfaces[] = |
804 | { |
805 | /* "none" or no compression */ |
806 | { |
807 | CHDCOMPRESSION_NONE, |
808 | "none", |
809 | FALSE, |
810 | NULL, |
811 | NULL, |
812 | NULL, |
813 | NULL |
814 | }, |
815 | |
816 | /* standard zlib compression */ |
817 | { |
818 | CHDCOMPRESSION_ZLIB, |
819 | "zlib", |
820 | FALSE, |
821 | zlib_codec_init, |
822 | zlib_codec_free, |
823 | zlib_codec_decompress, |
824 | NULL |
825 | }, |
826 | |
827 | /* zlib+ compression */ |
828 | { |
829 | CHDCOMPRESSION_ZLIB_PLUS, |
830 | "zlib+", |
831 | FALSE, |
832 | zlib_codec_init, |
833 | zlib_codec_free, |
834 | zlib_codec_decompress, |
835 | NULL |
836 | }, |
837 | |
9c659ffe |
838 | /* V5 zlib compression */ |
839 | { |
840 | CHD_CODEC_ZLIB, |
841 | "zlib (Deflate)", |
842 | FALSE, |
843 | zlib_codec_init, |
844 | zlib_codec_free, |
845 | zlib_codec_decompress, |
846 | NULL |
847 | }, |
848 | |
ce188d4d |
849 | /* V5 CD zlib compression */ |
850 | { |
851 | CHD_CODEC_CD_ZLIB, |
852 | "cdzl (CD Deflate)", |
853 | FALSE, |
854 | cdzl_codec_init, |
855 | cdzl_codec_free, |
856 | cdzl_codec_decompress, |
857 | NULL |
9c659ffe |
858 | }, |
ce188d4d |
859 | |
860 | /* V5 CD lzma compression */ |
861 | { |
862 | CHD_CODEC_CD_LZMA, |
863 | "cdlz (CD LZMA)", |
864 | FALSE, |
865 | cdlz_codec_init, |
866 | cdlz_codec_free, |
867 | cdlz_codec_decompress, |
868 | NULL |
9c659ffe |
869 | }, |
ce188d4d |
870 | |
871 | /* V5 CD flac compression */ |
872 | { |
873 | CHD_CODEC_CD_FLAC, |
874 | "cdfl (CD FLAC)", |
875 | FALSE, |
876 | cdfl_codec_init, |
877 | cdfl_codec_free, |
878 | cdfl_codec_decompress, |
879 | NULL |
9c659ffe |
880 | }, |
ce188d4d |
881 | }; |
882 | |
883 | /*************************************************************************** |
884 | INLINE FUNCTIONS |
885 | ***************************************************************************/ |
886 | |
887 | /*------------------------------------------------- |
888 | get_bigendian_uint64 - fetch a UINT64 from |
889 | the data stream in bigendian order |
890 | -------------------------------------------------*/ |
891 | |
892 | static inline UINT64 get_bigendian_uint64(const UINT8 *base) |
893 | { |
894 | return ((UINT64)base[0] << 56) | ((UINT64)base[1] << 48) | ((UINT64)base[2] << 40) | ((UINT64)base[3] << 32) | |
895 | ((UINT64)base[4] << 24) | ((UINT64)base[5] << 16) | ((UINT64)base[6] << 8) | (UINT64)base[7]; |
896 | } |
897 | |
ce188d4d |
898 | /*------------------------------------------------- |
899 | put_bigendian_uint64 - write a UINT64 to |
900 | the data stream in bigendian order |
901 | -------------------------------------------------*/ |
902 | |
903 | static inline void put_bigendian_uint64(UINT8 *base, UINT64 value) |
904 | { |
905 | base[0] = value >> 56; |
906 | base[1] = value >> 48; |
907 | base[2] = value >> 40; |
908 | base[3] = value >> 32; |
909 | base[4] = value >> 24; |
910 | base[5] = value >> 16; |
911 | base[6] = value >> 8; |
912 | base[7] = value; |
913 | } |
914 | |
915 | /*------------------------------------------------- |
916 | get_bigendian_uint48 - fetch a UINT48 from |
917 | the data stream in bigendian order |
918 | -------------------------------------------------*/ |
919 | |
920 | static inline UINT64 get_bigendian_uint48(const UINT8 *base) |
921 | { |
922 | return ((UINT64)base[0] << 40) | ((UINT64)base[1] << 32) | |
923 | ((UINT64)base[2] << 24) | ((UINT64)base[3] << 16) | ((UINT64)base[4] << 8) | (UINT64)base[5]; |
924 | } |
925 | |
926 | /*------------------------------------------------- |
927 | put_bigendian_uint48 - write a UINT48 to |
928 | the data stream in bigendian order |
929 | -------------------------------------------------*/ |
930 | |
931 | static inline void put_bigendian_uint48(UINT8 *base, UINT64 value) |
932 | { |
9c659ffe |
933 | value &= 0xffffffffffff; |
ce188d4d |
934 | base[0] = value >> 40; |
935 | base[1] = value >> 32; |
936 | base[2] = value >> 24; |
937 | base[3] = value >> 16; |
938 | base[4] = value >> 8; |
939 | base[5] = value; |
940 | } |
941 | /*------------------------------------------------- |
942 | get_bigendian_uint32 - fetch a UINT32 from |
943 | the data stream in bigendian order |
944 | -------------------------------------------------*/ |
945 | |
946 | static inline UINT32 get_bigendian_uint32(const UINT8 *base) |
947 | { |
948 | return (base[0] << 24) | (base[1] << 16) | (base[2] << 8) | base[3]; |
949 | } |
950 | |
ce188d4d |
951 | /*------------------------------------------------- |
952 | put_bigendian_uint32 - write a UINT32 to |
953 | the data stream in bigendian order |
954 | -------------------------------------------------*/ |
955 | |
9c659ffe |
956 | static inline void put_bigendian_uint32(UINT8 *base, UINT32 value) |
ce188d4d |
957 | { |
9c659ffe |
958 | base[0] = value >> 24; |
959 | base[1] = value >> 16; |
960 | base[2] = value >> 8; |
961 | base[3] = value; |
ce188d4d |
962 | } |
963 | |
ce188d4d |
964 | /*------------------------------------------------- |
965 | put_bigendian_uint24 - write a UINT24 to |
966 | the data stream in bigendian order |
967 | -------------------------------------------------*/ |
968 | |
9c659ffe |
969 | static inline void put_bigendian_uint24(UINT8 *base, UINT32 value) |
ce188d4d |
970 | { |
971 | value &= 0xffffff; |
972 | base[0] = value >> 16; |
973 | base[1] = value >> 8; |
974 | base[2] = value; |
975 | } |
976 | |
977 | /*------------------------------------------------- |
978 | get_bigendian_uint24 - fetch a UINT24 from |
979 | the data stream in bigendian order |
980 | -------------------------------------------------*/ |
981 | |
982 | static inline UINT32 get_bigendian_uint24(const UINT8 *base) |
983 | { |
984 | return (base[0] << 16) | (base[1] << 8) | base[2]; |
985 | } |
986 | |
987 | /*------------------------------------------------- |
988 | get_bigendian_uint16 - fetch a UINT16 from |
989 | the data stream in bigendian order |
990 | -------------------------------------------------*/ |
991 | |
992 | static inline UINT16 get_bigendian_uint16(const UINT8 *base) |
993 | { |
994 | return (base[0] << 8) | base[1]; |
995 | } |
996 | |
ce188d4d |
997 | /*------------------------------------------------- |
998 | put_bigendian_uint16 - write a UINT16 to |
999 | the data stream in bigendian order |
1000 | -------------------------------------------------*/ |
1001 | |
1002 | static inline void put_bigendian_uint16(UINT8 *base, UINT16 value) |
1003 | { |
1004 | base[0] = value >> 8; |
1005 | base[1] = value; |
1006 | } |
1007 | |
ce188d4d |
1008 | /*------------------------------------------------- |
1009 | map_extract - extract a single map |
1010 | entry from the datastream |
1011 | -------------------------------------------------*/ |
1012 | |
1013 | static inline void map_extract(const UINT8 *base, map_entry *entry) |
1014 | { |
1015 | entry->offset = get_bigendian_uint64(&base[0]); |
1016 | entry->crc = get_bigendian_uint32(&base[8]); |
1017 | entry->length = get_bigendian_uint16(&base[12]) | (base[14] << 16); |
1018 | entry->flags = base[15]; |
1019 | } |
1020 | |
ce188d4d |
1021 | /*------------------------------------------------- |
1022 | map_assemble - write a single map |
1023 | entry to the datastream |
1024 | -------------------------------------------------*/ |
1025 | |
1026 | static inline void map_assemble(UINT8 *base, map_entry *entry) |
1027 | { |
1028 | put_bigendian_uint64(&base[0], entry->offset); |
1029 | put_bigendian_uint32(&base[8], entry->crc); |
1030 | put_bigendian_uint16(&base[12], entry->length); |
1031 | base[14] = entry->length >> 16; |
1032 | base[15] = entry->flags; |
1033 | } |
1034 | |
1035 | /*------------------------------------------------- |
1036 | map_size_v5 - calculate CHDv5 map size |
1037 | -------------------------------------------------*/ |
1038 | static inline int map_size_v5(chd_header* header) |
1039 | { |
1040 | return header->hunkcount * header->mapentrybytes; |
1041 | } |
1042 | |
ce188d4d |
1043 | /*------------------------------------------------- |
1044 | crc16 - calculate CRC16 (from hashing.cpp) |
1045 | -------------------------------------------------*/ |
1046 | uint16_t crc16(const void *data, uint32_t length) |
1047 | { |
1048 | uint16_t crc = 0xffff; |
1049 | |
1050 | static const uint16_t s_table[256] = |
1051 | { |
1052 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, |
1053 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, |
1054 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, |
1055 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, |
1056 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, |
1057 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, |
1058 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, |
1059 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, |
1060 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
1061 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, |
1062 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, |
1063 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, |
1064 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, |
1065 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, |
1066 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, |
1067 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, |
1068 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, |
1069 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
1070 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, |
1071 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, |
1072 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, |
1073 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
1074 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, |
1075 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, |
1076 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, |
1077 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, |
1078 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
1079 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, |
1080 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, |
1081 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, |
1082 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, |
1083 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 |
1084 | }; |
1085 | |
1086 | const uint8_t *src = (uint8_t*)data; |
1087 | |
9c659ffe |
1088 | /* fetch the current value into a local and rip through the source data */ |
ce188d4d |
1089 | while (length-- != 0) |
1090 | crc = (crc << 8) ^ s_table[(crc >> 8) ^ *src++]; |
1091 | return crc; |
1092 | } |
1093 | |
9c659ffe |
1094 | /*------------------------------------------------- |
1095 | compressed - test if CHD file is compressed |
1096 | +-------------------------------------------------*/ |
1097 | |
1098 | static inline int compressed(chd_header* header) { |
1099 | return header->compression[0] != CHD_CODEC_NONE; |
1100 | } |
1101 | |
ce188d4d |
1102 | /*------------------------------------------------- |
1103 | decompress_v5_map - decompress the v5 map |
1104 | -------------------------------------------------*/ |
1105 | |
1106 | static chd_error decompress_v5_map(chd_file* chd, chd_header* header) |
1107 | { |
9c659ffe |
1108 | int rawmapsize = map_size_v5(header); |
ce188d4d |
1109 | |
9c659ffe |
1110 | if (!compressed(header)) |
ce188d4d |
1111 | { |
9c659ffe |
1112 | header->rawmap = (uint8_t*)malloc(rawmapsize); |
1113 | core_fseek(chd->file, header->mapoffset, SEEK_SET); |
1114 | core_fread(chd->file, header->rawmap, rawmapsize); |
1115 | return CHDERR_NONE; |
ce188d4d |
1116 | } |
1117 | |
9c659ffe |
1118 | /* read the reader */ |
1119 | uint8_t rawbuf[16]; |
ce188d4d |
1120 | core_fseek(chd->file, header->mapoffset, SEEK_SET); |
1121 | core_fread(chd->file, rawbuf, sizeof(rawbuf)); |
9c659ffe |
1122 | uint32_t const mapbytes = get_bigendian_uint32(&rawbuf[0]); |
1123 | uint64_t const firstoffs = get_bigendian_uint48(&rawbuf[4]); |
1124 | uint16_t const mapcrc = get_bigendian_uint16(&rawbuf[10]); |
1125 | uint8_t const lengthbits = rawbuf[12]; |
1126 | uint8_t const selfbits = rawbuf[13]; |
1127 | uint8_t const parentbits = rawbuf[14]; |
1128 | |
1129 | /* now read the map */ |
1130 | uint8_t* compressed = (uint8_t*)malloc(sizeof(uint8_t) * mapbytes); |
ce188d4d |
1131 | core_fseek(chd->file, header->mapoffset + 16, SEEK_SET); |
1132 | core_fread(chd->file, compressed, mapbytes); |
9c659ffe |
1133 | struct bitstream* bitbuf = create_bitstream(compressed, sizeof(uint8_t) * mapbytes); |
1134 | header->rawmap = (uint8_t*)malloc(rawmapsize); |
ce188d4d |
1135 | |
9c659ffe |
1136 | /* first decode the compression types */ |
1137 | struct huffman_decoder* decoder = create_huffman_decoder(16, 8); |
1138 | enum huffman_error err = huffman_import_tree_rle(decoder, bitbuf); |
ce188d4d |
1139 | if (err != HUFFERR_NONE) |
1140 | return CHDERR_DECOMPRESSION_ERROR; |
9c659ffe |
1141 | uint8_t lastcomp = 0; |
1142 | int repcount = 0; |
1143 | for (int hunknum = 0; hunknum < header->hunkcount; hunknum++) |
ce188d4d |
1144 | { |
1145 | uint8_t *rawmap = header->rawmap + (hunknum * 12); |
1146 | if (repcount > 0) |
1147 | rawmap[0] = lastcomp, repcount--; |
1148 | else |
1149 | { |
1150 | uint8_t val = huffman_decode_one(decoder, bitbuf); |
1151 | if (val == COMPRESSION_RLE_SMALL) |
1152 | rawmap[0] = lastcomp, repcount = 2 + huffman_decode_one(decoder, bitbuf); |
1153 | else if (val == COMPRESSION_RLE_LARGE) |
1154 | rawmap[0] = lastcomp, repcount = 2 + 16 + (huffman_decode_one(decoder, bitbuf) << 4), repcount += huffman_decode_one(decoder, bitbuf); |
1155 | else |
1156 | rawmap[0] = lastcomp = val; |
1157 | } |
1158 | } |
1159 | |
9c659ffe |
1160 | /* then iterate through the hunks and extract the needed data */ |
1161 | uint64_t curoffset = firstoffs; |
1162 | uint32_t last_self = 0; |
1163 | uint64_t last_parent = 0; |
1164 | for (int hunknum = 0; hunknum < header->hunkcount; hunknum++) |
ce188d4d |
1165 | { |
1166 | uint8_t *rawmap = header->rawmap + (hunknum * 12); |
1167 | uint64_t offset = curoffset; |
1168 | uint32_t length = 0; |
1169 | uint16_t crc = 0; |
1170 | switch (rawmap[0]) |
1171 | { |
9c659ffe |
1172 | /* base types */ |
ce188d4d |
1173 | case COMPRESSION_TYPE_0: |
1174 | case COMPRESSION_TYPE_1: |
1175 | case COMPRESSION_TYPE_2: |
1176 | case COMPRESSION_TYPE_3: |
1177 | curoffset += length = bitstream_read(bitbuf, lengthbits); |
1178 | crc = bitstream_read(bitbuf, 16); |
1179 | break; |
1180 | |
1181 | case COMPRESSION_NONE: |
1182 | curoffset += length = header->hunkbytes; |
1183 | crc = bitstream_read(bitbuf, 16); |
1184 | break; |
1185 | |
1186 | case COMPRESSION_SELF: |
1187 | last_self = offset = bitstream_read(bitbuf, selfbits); |
1188 | break; |
1189 | |
1190 | case COMPRESSION_PARENT: |
1191 | offset = bitstream_read(bitbuf, parentbits); |
1192 | last_parent = offset; |
1193 | break; |
1194 | |
9c659ffe |
1195 | /* pseudo-types; convert into base types */ |
ce188d4d |
1196 | case COMPRESSION_SELF_1: |
1197 | last_self++; |
1198 | case COMPRESSION_SELF_0: |
1199 | rawmap[0] = COMPRESSION_SELF; |
1200 | offset = last_self; |
1201 | break; |
1202 | |
1203 | case COMPRESSION_PARENT_SELF: |
1204 | rawmap[0] = COMPRESSION_PARENT; |
1205 | last_parent = offset = ( ((uint64_t)hunknum) * ((uint64_t)header->hunkbytes) ) / header->unitbytes; |
1206 | break; |
1207 | |
1208 | case COMPRESSION_PARENT_1: |
1209 | last_parent += header->hunkbytes / header->unitbytes; |
1210 | case COMPRESSION_PARENT_0: |
1211 | rawmap[0] = COMPRESSION_PARENT; |
1212 | offset = last_parent; |
1213 | break; |
1214 | } |
9c659ffe |
1215 | /* UINT24 length */ |
ce188d4d |
1216 | put_bigendian_uint24(&rawmap[1], length); |
1217 | |
9c659ffe |
1218 | /* UINT48 offset */ |
ce188d4d |
1219 | put_bigendian_uint48(&rawmap[4], offset); |
1220 | |
9c659ffe |
1221 | /* crc16 */ |
ce188d4d |
1222 | put_bigendian_uint16(&rawmap[10], crc); |
1223 | } |
1224 | |
9c659ffe |
1225 | free(compressed); |
1226 | free(bitbuf); |
1227 | free(decoder->lookup); |
1228 | free(decoder->huffnode); |
1229 | free(decoder); |
1230 | |
1231 | /* verify the final CRC */ |
ce188d4d |
1232 | if (crc16(&header->rawmap[0], header->hunkcount * 12) != mapcrc) |
1233 | return CHDERR_DECOMPRESSION_ERROR; |
1234 | |
1235 | return CHDERR_NONE; |
1236 | } |
1237 | |
1238 | /*------------------------------------------------- |
1239 | map_extract_old - extract a single map |
1240 | entry in old format from the datastream |
1241 | -------------------------------------------------*/ |
1242 | |
1243 | static inline void map_extract_old(const UINT8 *base, map_entry *entry, UINT32 hunkbytes) |
1244 | { |
1245 | entry->offset = get_bigendian_uint64(&base[0]); |
1246 | entry->crc = 0; |
1247 | entry->length = entry->offset >> 44; |
1248 | entry->flags = MAP_ENTRY_FLAG_NO_CRC | ((entry->length == hunkbytes) ? V34_MAP_ENTRY_TYPE_UNCOMPRESSED : V34_MAP_ENTRY_TYPE_COMPRESSED); |
1249 | #ifdef __MWERKS__ |
1250 | entry->offset = entry->offset & 0x00000FFFFFFFFFFFLL; |
1251 | #else |
1252 | entry->offset = (entry->offset << 20) >> 20; |
1253 | #endif |
1254 | } |
1255 | |
ce188d4d |
1256 | /*************************************************************************** |
1257 | CHD FILE MANAGEMENT |
1258 | ***************************************************************************/ |
1259 | |
ce188d4d |
1260 | /*------------------------------------------------- |
1261 | chd_open_file - open a CHD file for access |
1262 | -------------------------------------------------*/ |
1263 | |
1264 | chd_error chd_open_file(core_file *file, int mode, chd_file *parent, chd_file **chd) |
1265 | { |
1266 | chd_file *newchd = NULL; |
1267 | chd_error err; |
1268 | int intfnum; |
1269 | |
1270 | /* verify parameters */ |
1271 | if (file == NULL) |
1272 | EARLY_EXIT(err = CHDERR_INVALID_PARAMETER); |
1273 | |
1274 | /* punt if invalid parent */ |
1275 | if (parent != NULL && parent->cookie != COOKIE_VALUE) |
1276 | EARLY_EXIT(err = CHDERR_INVALID_PARAMETER); |
1277 | |
1278 | /* allocate memory for the final result */ |
9c659ffe |
1279 | newchd = (chd_file *)malloc(sizeof(**chd)); |
ce188d4d |
1280 | if (newchd == NULL) |
1281 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
9c659ffe |
1282 | memset(newchd, 0, sizeof(*newchd)); |
ce188d4d |
1283 | newchd->cookie = COOKIE_VALUE; |
1284 | newchd->parent = parent; |
1285 | newchd->file = file; |
1286 | |
1287 | /* now attempt to read the header */ |
9c659ffe |
1288 | err = header_read(newchd, &newchd->header); |
ce188d4d |
1289 | if (err != CHDERR_NONE) |
1290 | EARLY_EXIT(err); |
1291 | |
1292 | /* validate the header */ |
1293 | err = header_validate(&newchd->header); |
1294 | if (err != CHDERR_NONE) |
1295 | EARLY_EXIT(err); |
1296 | |
1297 | /* make sure we don't open a read-only file writeable */ |
1298 | if (mode == CHD_OPEN_READWRITE && !(newchd->header.flags & CHDFLAGS_IS_WRITEABLE)) |
1299 | EARLY_EXIT(err = CHDERR_FILE_NOT_WRITEABLE); |
1300 | |
1301 | /* also, never open an older version writeable */ |
1302 | if (mode == CHD_OPEN_READWRITE && newchd->header.version < CHD_HEADER_VERSION) |
1303 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_VERSION); |
1304 | |
1305 | /* if we need a parent, make sure we have one */ |
1306 | if (parent == NULL && (newchd->header.flags & CHDFLAGS_HAS_PARENT)) |
1307 | EARLY_EXIT(err = CHDERR_REQUIRES_PARENT); |
1308 | |
1309 | /* make sure we have a valid parent */ |
1310 | if (parent != NULL) |
1311 | { |
1312 | /* check MD5 if it isn't empty */ |
1313 | if (memcmp(nullmd5, newchd->header.parentmd5, sizeof(newchd->header.parentmd5)) != 0 && |
1314 | memcmp(nullmd5, newchd->parent->header.md5, sizeof(newchd->parent->header.md5)) != 0 && |
1315 | memcmp(newchd->parent->header.md5, newchd->header.parentmd5, sizeof(newchd->header.parentmd5)) != 0) |
1316 | EARLY_EXIT(err = CHDERR_INVALID_PARENT); |
1317 | |
1318 | /* check SHA1 if it isn't empty */ |
1319 | if (memcmp(nullsha1, newchd->header.parentsha1, sizeof(newchd->header.parentsha1)) != 0 && |
1320 | memcmp(nullsha1, newchd->parent->header.sha1, sizeof(newchd->parent->header.sha1)) != 0 && |
1321 | memcmp(newchd->parent->header.sha1, newchd->header.parentsha1, sizeof(newchd->header.parentsha1)) != 0) |
1322 | EARLY_EXIT(err = CHDERR_INVALID_PARENT); |
1323 | } |
1324 | |
1325 | /* now read the hunk map */ |
1326 | if (newchd->header.version < 5) |
1327 | { |
1328 | err = map_read(newchd); |
ce188d4d |
1329 | } |
9c659ffe |
1330 | else |
ce188d4d |
1331 | { |
1332 | err = decompress_v5_map(newchd, &(newchd->header)); |
1333 | } |
9c659ffe |
1334 | if (err != CHDERR_NONE) |
1335 | EARLY_EXIT(err); |
1336 | |
ce188d4d |
1337 | |
1338 | /* allocate and init the hunk cache */ |
1339 | newchd->cache = (UINT8 *)malloc(newchd->header.hunkbytes); |
1340 | newchd->compare = (UINT8 *)malloc(newchd->header.hunkbytes); |
1341 | if (newchd->cache == NULL || newchd->compare == NULL) |
1342 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
1343 | newchd->cachehunk = ~0; |
1344 | newchd->comparehunk = ~0; |
1345 | |
1346 | /* allocate the temporary compressed buffer */ |
1347 | newchd->compressed = (UINT8 *)malloc(newchd->header.hunkbytes); |
1348 | if (newchd->compressed == NULL) |
1349 | EARLY_EXIT(err = CHDERR_OUT_OF_MEMORY); |
1350 | |
1351 | /* find the codec interface */ |
1352 | if (newchd->header.version < 5) |
1353 | { |
1354 | for (intfnum = 0; intfnum < ARRAY_LENGTH(codec_interfaces); intfnum++) |
9c659ffe |
1355 | { |
ce188d4d |
1356 | if (codec_interfaces[intfnum].compression == newchd->header.compression[0]) |
1357 | { |
1358 | newchd->codecintf[0] = &codec_interfaces[intfnum]; |
1359 | break; |
1360 | } |
9c659ffe |
1361 | } |
1362 | |
ce188d4d |
1363 | if (intfnum == ARRAY_LENGTH(codec_interfaces)) |
1364 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1365 | |
1366 | /* initialize the codec */ |
1367 | if (newchd->codecintf[0]->init != NULL) |
9c659ffe |
1368 | { |
ce188d4d |
1369 | err = (*newchd->codecintf[0]->init)(&newchd->zlib_codec_data, newchd->header.hunkbytes); |
9c659ffe |
1370 | if (err != CHDERR_NONE) |
1371 | EARLY_EXIT(err); |
1372 | } |
ce188d4d |
1373 | } |
1374 | else |
1375 | { |
9c659ffe |
1376 | /* verify the compression types and initialize the codecs */ |
1377 | for (int decompnum = 0; decompnum < ARRAY_LENGTH(newchd->header.compression); decompnum++) |
ce188d4d |
1378 | { |
9c659ffe |
1379 | for (int i = 0 ; i < ARRAY_LENGTH(codec_interfaces) ; i++) |
ce188d4d |
1380 | { |
1381 | if (codec_interfaces[i].compression == newchd->header.compression[decompnum]) |
1382 | { |
1383 | newchd->codecintf[decompnum] = &codec_interfaces[i]; |
9c659ffe |
1384 | break; |
ce188d4d |
1385 | } |
1386 | } |
9c659ffe |
1387 | |
1388 | if (newchd->codecintf[decompnum] == NULL && newchd->header.compression[decompnum] != 0) |
1389 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1390 | |
1391 | /* initialize the codec */ |
1392 | if (newchd->codecintf[decompnum]->init != NULL) |
1393 | { |
1394 | void* codec = NULL; |
1395 | switch (newchd->header.compression[decompnum]) |
1396 | { |
1397 | case CHD_CODEC_ZLIB: |
1398 | codec = &newchd->zlib_codec_data; |
1399 | break; |
1400 | |
1401 | case CHD_CODEC_CD_ZLIB: |
1402 | codec = &newchd->cdzl_codec_data; |
1403 | break; |
1404 | |
1405 | case CHD_CODEC_CD_LZMA: |
1406 | codec = &newchd->cdlz_codec_data; |
1407 | break; |
1408 | |
1409 | case CHD_CODEC_CD_FLAC: |
1410 | codec = &newchd->cdfl_codec_data; |
1411 | break; |
1412 | } |
1413 | |
1414 | if (codec == NULL) |
1415 | EARLY_EXIT(err = CHDERR_UNSUPPORTED_FORMAT); |
1416 | |
1417 | err = (*newchd->codecintf[decompnum]->init)(codec, newchd->header.hunkbytes); |
1418 | if (err != CHDERR_NONE) |
1419 | EARLY_EXIT(err); |
1420 | } |
ce188d4d |
1421 | } |
1422 | } |
1423 | |
ce188d4d |
1424 | /* all done */ |
1425 | *chd = newchd; |
1426 | return CHDERR_NONE; |
1427 | |
1428 | cleanup: |
1429 | if (newchd != NULL) |
1430 | chd_close(newchd); |
1431 | return err; |
1432 | } |
1433 | |
9c659ffe |
1434 | /*------------------------------------------------- |
1435 | chd_precache - precache underlying file in |
1436 | memory |
1437 | -------------------------------------------------*/ |
1438 | |
1439 | chd_error chd_precache(chd_file *chd) |
1440 | { |
1441 | ssize_t size, count; |
1442 | |
1443 | if (chd->file_cache == NULL) |
1444 | { |
1445 | core_fseek(chd->file, 0, SEEK_END); |
1446 | size = core_ftell(chd->file); |
1447 | if (size <= 0) |
1448 | return CHDERR_INVALID_DATA; |
1449 | chd->file_cache = malloc(size); |
1450 | if (chd->file_cache == NULL) |
1451 | return CHDERR_OUT_OF_MEMORY; |
1452 | core_fseek(chd->file, 0, SEEK_SET); |
1453 | count = core_fread(chd->file, chd->file_cache, size); |
1454 | if (count != size) |
1455 | { |
1456 | free(chd->file_cache); |
1457 | chd->file_cache = NULL; |
1458 | return CHDERR_READ_ERROR; |
1459 | } |
1460 | } |
1461 | |
1462 | return CHDERR_NONE; |
1463 | } |
1464 | |
ce188d4d |
1465 | /*------------------------------------------------- |
1466 | chd_open - open a CHD file by |
1467 | filename |
1468 | -------------------------------------------------*/ |
1469 | |
1470 | chd_error chd_open(const char *filename, int mode, chd_file *parent, chd_file **chd) |
1471 | { |
1472 | chd_error err; |
1473 | core_file *file = NULL; |
1474 | UINT32 openflags; |
1475 | |
1476 | /* choose the proper mode */ |
1477 | switch(mode) |
1478 | { |
1479 | case CHD_OPEN_READ: |
1480 | break; |
1481 | |
1482 | default: |
1483 | err = CHDERR_INVALID_PARAMETER; |
1484 | goto cleanup; |
1485 | } |
1486 | |
1487 | /* open the file */ |
1488 | file = core_fopen(filename); |
1489 | if (file == 0) |
1490 | { |
1491 | err = CHDERR_FILE_NOT_FOUND; |
1492 | goto cleanup; |
1493 | } |
1494 | |
1495 | /* now open the CHD */ |
1496 | err = chd_open_file(file, mode, parent, chd); |
1497 | if (err != CHDERR_NONE) |
1498 | goto cleanup; |
1499 | |
1500 | /* we now own this file */ |
1501 | (*chd)->owns_file = TRUE; |
1502 | |
1503 | cleanup: |
1504 | if ((err != CHDERR_NONE) && (file != NULL)) |
1505 | core_fclose(file); |
1506 | return err; |
1507 | } |
1508 | |
ce188d4d |
1509 | /*------------------------------------------------- |
1510 | chd_close - close a CHD file for access |
1511 | -------------------------------------------------*/ |
1512 | |
1513 | void chd_close(chd_file *chd) |
1514 | { |
1515 | /* punt if NULL or invalid */ |
1516 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
1517 | return; |
1518 | |
1519 | /* deinit the codec */ |
1520 | if (chd->header.version < 5) |
1521 | { |
9c659ffe |
1522 | if (chd->codecintf[0] != NULL && chd->codecintf[0]->free != NULL) |
1523 | (*chd->codecintf[0]->free)(&chd->zlib_codec_data); |
ce188d4d |
1524 | } |
1525 | else |
1526 | { |
9c659ffe |
1527 | /* Free the codecs */ |
1528 | for (int i = 0 ; i < ARRAY_LENGTH(chd->codecintf); i++) |
ce188d4d |
1529 | { |
1530 | void* codec = NULL; |
9c659ffe |
1531 | |
1532 | if (chd->codecintf[i] == NULL) |
1533 | continue; |
1534 | |
ce188d4d |
1535 | switch (chd->codecintf[i]->compression) |
1536 | { |
1537 | case CHD_CODEC_CD_LZMA: |
1538 | codec = &chd->cdlz_codec_data; |
1539 | break; |
1540 | |
9c659ffe |
1541 | case CHD_CODEC_ZLIB: |
1542 | codec = &chd->zlib_codec_data; |
1543 | break; |
1544 | |
ce188d4d |
1545 | case CHD_CODEC_CD_ZLIB: |
1546 | codec = &chd->cdzl_codec_data; |
1547 | break; |
1548 | |
1549 | case CHD_CODEC_CD_FLAC: |
1550 | codec = &chd->cdfl_codec_data; |
1551 | break; |
9c659ffe |
1552 | } |
1553 | |
ce188d4d |
1554 | if (codec) |
1555 | { |
1556 | (*chd->codecintf[i]->free)(codec); |
1557 | } |
1558 | } |
1559 | |
9c659ffe |
1560 | /* Free the raw map */ |
ce188d4d |
1561 | if (chd->header.rawmap != NULL) |
1562 | free(chd->header.rawmap); |
1563 | } |
1564 | |
1565 | /* free the compressed data buffer */ |
1566 | if (chd->compressed != NULL) |
1567 | free(chd->compressed); |
1568 | |
1569 | /* free the hunk cache and compare data */ |
1570 | if (chd->compare != NULL) |
1571 | free(chd->compare); |
1572 | if (chd->cache != NULL) |
1573 | free(chd->cache); |
1574 | |
1575 | /* free the hunk map */ |
1576 | if (chd->map != NULL) |
1577 | free(chd->map); |
1578 | |
1579 | /* free the CRC table */ |
1580 | if (chd->crctable != NULL) |
1581 | free(chd->crctable); |
1582 | |
1583 | /* free the CRC map */ |
1584 | if (chd->crcmap != NULL) |
1585 | free(chd->crcmap); |
1586 | |
1587 | /* close the file */ |
1588 | if (chd->owns_file && chd->file != NULL) |
1589 | core_fclose(chd->file); |
1590 | |
1591 | if (PRINTF_MAX_HUNK) printf("Max hunk = %d/%d\n", chd->maxhunk, chd->header.totalhunks); |
1592 | |
1593 | if (chd->file_cache) |
1594 | free(chd->file_cache); |
1595 | |
1596 | /* free our memory */ |
1597 | free(chd); |
1598 | } |
1599 | |
ce188d4d |
1600 | /*------------------------------------------------- |
1601 | chd_core_file - return the associated |
1602 | core_file |
1603 | -------------------------------------------------*/ |
1604 | |
1605 | core_file *chd_core_file(chd_file *chd) |
1606 | { |
1607 | return chd->file; |
1608 | } |
1609 | |
ce188d4d |
1610 | /*------------------------------------------------- |
1611 | chd_error_string - return an error string for |
1612 | the given CHD error |
1613 | -------------------------------------------------*/ |
1614 | |
1615 | const char *chd_error_string(chd_error err) |
1616 | { |
1617 | switch (err) |
1618 | { |
1619 | case CHDERR_NONE: return "no error"; |
1620 | case CHDERR_NO_INTERFACE: return "no drive interface"; |
1621 | case CHDERR_OUT_OF_MEMORY: return "out of memory"; |
1622 | case CHDERR_INVALID_FILE: return "invalid file"; |
1623 | case CHDERR_INVALID_PARAMETER: return "invalid parameter"; |
1624 | case CHDERR_INVALID_DATA: return "invalid data"; |
1625 | case CHDERR_FILE_NOT_FOUND: return "file not found"; |
1626 | case CHDERR_REQUIRES_PARENT: return "requires parent"; |
1627 | case CHDERR_FILE_NOT_WRITEABLE: return "file not writeable"; |
1628 | case CHDERR_READ_ERROR: return "read error"; |
1629 | case CHDERR_WRITE_ERROR: return "write error"; |
1630 | case CHDERR_CODEC_ERROR: return "codec error"; |
1631 | case CHDERR_INVALID_PARENT: return "invalid parent"; |
1632 | case CHDERR_HUNK_OUT_OF_RANGE: return "hunk out of range"; |
1633 | case CHDERR_DECOMPRESSION_ERROR: return "decompression error"; |
1634 | case CHDERR_COMPRESSION_ERROR: return "compression error"; |
1635 | case CHDERR_CANT_CREATE_FILE: return "can't create file"; |
1636 | case CHDERR_CANT_VERIFY: return "can't verify file"; |
1637 | case CHDERR_NOT_SUPPORTED: return "operation not supported"; |
1638 | case CHDERR_METADATA_NOT_FOUND: return "can't find metadata"; |
1639 | case CHDERR_INVALID_METADATA_SIZE: return "invalid metadata size"; |
1640 | case CHDERR_UNSUPPORTED_VERSION: return "unsupported CHD version"; |
1641 | case CHDERR_VERIFY_INCOMPLETE: return "incomplete verify"; |
1642 | case CHDERR_INVALID_METADATA: return "invalid metadata"; |
1643 | case CHDERR_INVALID_STATE: return "invalid state"; |
1644 | case CHDERR_OPERATION_PENDING: return "operation pending"; |
1645 | case CHDERR_NO_ASYNC_OPERATION: return "no async operation in progress"; |
1646 | case CHDERR_UNSUPPORTED_FORMAT: return "unsupported format"; |
1647 | default: return "undocumented error"; |
1648 | } |
1649 | } |
1650 | |
ce188d4d |
1651 | /*************************************************************************** |
1652 | CHD HEADER MANAGEMENT |
1653 | ***************************************************************************/ |
1654 | |
1655 | /*------------------------------------------------- |
1656 | chd_get_header - return a pointer to the |
1657 | extracted header data |
1658 | -------------------------------------------------*/ |
1659 | |
1660 | const chd_header *chd_get_header(chd_file *chd) |
1661 | { |
1662 | /* punt if NULL or invalid */ |
1663 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
1664 | return NULL; |
1665 | |
1666 | return &chd->header; |
1667 | } |
1668 | |
ce188d4d |
1669 | /*************************************************************************** |
1670 | CORE DATA READ/WRITE |
1671 | ***************************************************************************/ |
1672 | |
1673 | /*------------------------------------------------- |
1674 | chd_read - read a single hunk from the CHD |
1675 | file |
1676 | -------------------------------------------------*/ |
1677 | |
1678 | chd_error chd_read(chd_file *chd, UINT32 hunknum, void *buffer) |
1679 | { |
1680 | /* punt if NULL or invalid */ |
1681 | if (chd == NULL || chd->cookie != COOKIE_VALUE) |
1682 | return CHDERR_INVALID_PARAMETER; |
1683 | |
1684 | /* if we're past the end, fail */ |
1685 | if (hunknum >= chd->header.totalhunks) |
1686 | return CHDERR_HUNK_OUT_OF_RANGE; |
1687 | |
1688 | /* perform the read */ |
1689 | return hunk_read_into_memory(chd, hunknum, (UINT8 *)buffer); |
1690 | } |
1691 | |
ce188d4d |
1692 | /*************************************************************************** |
1693 | METADATA MANAGEMENT |
1694 | ***************************************************************************/ |
1695 | |
1696 | /*------------------------------------------------- |
1697 | chd_get_metadata - get the indexed metadata |
1698 | of the given type |
1699 | -------------------------------------------------*/ |
1700 | |
1701 | chd_error chd_get_metadata(chd_file *chd, UINT32 searchtag, UINT32 searchindex, void *output, UINT32 outputlen, UINT32 *resultlen, UINT32 *resulttag, UINT8 *resultflags) |
1702 | { |
1703 | metadata_entry metaentry; |
1704 | chd_error err; |
1705 | UINT32 count; |
1706 | |
1707 | /* if we didn't find it, just return */ |
1708 | err = metadata_find_entry(chd, searchtag, searchindex, &metaentry); |
1709 | if (err != CHDERR_NONE) |
1710 | { |
1711 | /* unless we're an old version and they are requesting hard disk metadata */ |
1712 | if (chd->header.version < 3 && (searchtag == HARD_DISK_METADATA_TAG || searchtag == CHDMETATAG_WILDCARD) && searchindex == 0) |
1713 | { |
1714 | char faux_metadata[256]; |
1715 | UINT32 faux_length; |
1716 | |
1717 | /* fill in the faux metadata */ |
1718 | 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); |
1719 | faux_length = (UINT32)strlen(faux_metadata) + 1; |
1720 | |
1721 | /* copy the metadata itself */ |
1722 | memcpy(output, faux_metadata, MIN(outputlen, faux_length)); |
1723 | |
1724 | /* return the length of the data and the tag */ |
1725 | if (resultlen != NULL) |
1726 | *resultlen = faux_length; |
1727 | if (resulttag != NULL) |
1728 | *resulttag = HARD_DISK_METADATA_TAG; |
1729 | return CHDERR_NONE; |
1730 | } |
1731 | return err; |
1732 | } |
1733 | |
1734 | /* read the metadata */ |
1735 | outputlen = MIN(outputlen, metaentry.length); |
1736 | core_fseek(chd->file, metaentry.offset + METADATA_HEADER_SIZE, SEEK_SET); |
1737 | count = core_fread(chd->file, output, outputlen); |
1738 | if (count != outputlen) |
1739 | return CHDERR_READ_ERROR; |
1740 | |
1741 | /* return the length of the data and the tag */ |
1742 | if (resultlen != NULL) |
1743 | *resultlen = metaentry.length; |
1744 | if (resulttag != NULL) |
1745 | *resulttag = metaentry.metatag; |
1746 | if (resultflags != NULL) |
1747 | *resultflags = metaentry.flags; |
1748 | return CHDERR_NONE; |
1749 | } |
1750 | |
ce188d4d |
1751 | /*************************************************************************** |
1752 | CODEC INTERFACES |
1753 | ***************************************************************************/ |
1754 | |
1755 | /*------------------------------------------------- |
1756 | chd_codec_config - set internal codec |
1757 | parameters |
1758 | -------------------------------------------------*/ |
1759 | |
1760 | chd_error chd_codec_config(chd_file *chd, int param, void *config) |
1761 | { |
ce188d4d |
1762 | return CHDERR_INVALID_PARAMETER; |
1763 | } |
1764 | |
ce188d4d |
1765 | /*------------------------------------------------- |
1766 | chd_get_codec_name - get the name of a |
1767 | particular codec |
1768 | -------------------------------------------------*/ |
1769 | |
1770 | const char *chd_get_codec_name(UINT32 codec) |
1771 | { |
1772 | return "Unknown"; |
1773 | } |
1774 | |
ce188d4d |
1775 | /*************************************************************************** |
1776 | INTERNAL HEADER OPERATIONS |
1777 | ***************************************************************************/ |
1778 | |
1779 | /*------------------------------------------------- |
1780 | header_validate - check the validity of a |
1781 | CHD header |
1782 | -------------------------------------------------*/ |
1783 | |
1784 | static chd_error header_validate(const chd_header *header) |
1785 | { |
1786 | int intfnum; |
9c659ffe |
1787 | |
ce188d4d |
1788 | /* require a valid version */ |
1789 | if (header->version == 0 || header->version > CHD_HEADER_VERSION) |
1790 | return CHDERR_UNSUPPORTED_VERSION; |
9c659ffe |
1791 | |
ce188d4d |
1792 | /* require a valid length */ |
1793 | if ((header->version == 1 && header->length != CHD_V1_HEADER_SIZE) || |
1794 | (header->version == 2 && header->length != CHD_V2_HEADER_SIZE) || |
1795 | (header->version == 3 && header->length != CHD_V3_HEADER_SIZE) || |
1796 | (header->version == 4 && header->length != CHD_V4_HEADER_SIZE) || |
1797 | (header->version == 5 && header->length != CHD_V5_HEADER_SIZE)) |
1798 | return CHDERR_INVALID_PARAMETER; |
9c659ffe |
1799 | |
ce188d4d |
1800 | /* Do not validate v5 header */ |
1801 | if (header->version <= 4) |
1802 | { |
1803 | /* require valid flags */ |
1804 | if (header->flags & CHDFLAGS_UNDEFINED) |
1805 | return CHDERR_INVALID_PARAMETER; |
1806 | |
1807 | /* require a supported compression mechanism */ |
1808 | for (intfnum = 0; intfnum < ARRAY_LENGTH(codec_interfaces); intfnum++) |
1809 | if (codec_interfaces[intfnum].compression == header->compression[0]) |
1810 | break; |
1811 | |
1812 | if (intfnum == ARRAY_LENGTH(codec_interfaces)) |
1813 | return CHDERR_INVALID_PARAMETER; |
1814 | |
1815 | /* require a valid hunksize */ |
1816 | if (header->hunkbytes == 0 || header->hunkbytes >= 65536 * 256) |
1817 | return CHDERR_INVALID_PARAMETER; |
1818 | |
1819 | /* require a valid hunk count */ |
1820 | if (header->totalhunks == 0) |
1821 | return CHDERR_INVALID_PARAMETER; |
1822 | |
1823 | /* require a valid MD5 and/or SHA1 if we're using a parent */ |
1824 | if ((header->flags & CHDFLAGS_HAS_PARENT) && memcmp(header->parentmd5, nullmd5, sizeof(nullmd5)) == 0 && memcmp(header->parentsha1, nullsha1, sizeof(nullsha1)) == 0) |
1825 | return CHDERR_INVALID_PARAMETER; |
1826 | |
1827 | /* if we're V3 or later, the obsolete fields must be 0 */ |
1828 | if (header->version >= 3 && |
1829 | (header->obsolete_cylinders != 0 || header->obsolete_sectors != 0 || |
1830 | header->obsolete_heads != 0 || header->obsolete_hunksize != 0)) |
1831 | return CHDERR_INVALID_PARAMETER; |
1832 | |
1833 | /* if we're pre-V3, the obsolete fields must NOT be 0 */ |
1834 | if (header->version < 3 && |
1835 | (header->obsolete_cylinders == 0 || header->obsolete_sectors == 0 || |
1836 | header->obsolete_heads == 0 || header->obsolete_hunksize == 0)) |
1837 | return CHDERR_INVALID_PARAMETER; |
1838 | } |
1839 | |
1840 | return CHDERR_NONE; |
1841 | } |
1842 | |
9c659ffe |
1843 | /*------------------------------------------------- |
1844 | header_guess_unitbytes - for older CHD formats, |
1845 | guess at the bytes/unit based on metadata |
1846 | -------------------------------------------------*/ |
1847 | |
1848 | static UINT32 header_guess_unitbytes(chd_file *chd) |
1849 | { |
1850 | /* look for hard disk metadata; if found, then the unit size == sector size */ |
1851 | char metadata[512]; |
1852 | int i0, i1, i2, i3; |
1853 | if (chd_get_metadata(chd, HARD_DISK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE && |
1854 | sscanf(metadata, HARD_DISK_METADATA_FORMAT, &i0, &i1, &i2, &i3) == 4) |
1855 | return i3; |
1856 | |
1857 | /* look for CD-ROM metadata; if found, then the unit size == CD frame size */ |
1858 | if (chd_get_metadata(chd, CDROM_OLD_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
1859 | chd_get_metadata(chd, CDROM_TRACK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
1860 | chd_get_metadata(chd, CDROM_TRACK_METADATA2_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
1861 | chd_get_metadata(chd, GDROM_OLD_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE || |
1862 | chd_get_metadata(chd, GDROM_TRACK_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL) == CHDERR_NONE) |
1863 | return CD_FRAME_SIZE; |
1864 | |
1865 | /* otherwise, just map 1:1 with the hunk size */ |
1866 | return chd->header.hunkbytes; |
1867 | } |
ce188d4d |
1868 | |
1869 | /*------------------------------------------------- |
1870 | header_read - read a CHD header into the |
1871 | internal data structure |
1872 | -------------------------------------------------*/ |
1873 | |
9c659ffe |
1874 | static chd_error header_read(chd_file *chd, chd_header *header) |
ce188d4d |
1875 | { |
1876 | UINT8 rawheader[CHD_MAX_HEADER_SIZE]; |
1877 | UINT32 count; |
1878 | |
1879 | /* punt if NULL */ |
1880 | if (header == NULL) |
1881 | return CHDERR_INVALID_PARAMETER; |
1882 | |
1883 | /* punt if invalid file */ |
9c659ffe |
1884 | if (chd->file == NULL) |
ce188d4d |
1885 | return CHDERR_INVALID_FILE; |
1886 | |
1887 | /* seek and read */ |
9c659ffe |
1888 | core_fseek(chd->file, 0, SEEK_SET); |
1889 | count = core_fread(chd->file, rawheader, sizeof(rawheader)); |
ce188d4d |
1890 | if (count != sizeof(rawheader)) |
1891 | return CHDERR_READ_ERROR; |
1892 | |
1893 | /* verify the tag */ |
1894 | if (strncmp((char *)rawheader, "MComprHD", 8) != 0) |
1895 | return CHDERR_INVALID_DATA; |
1896 | |
1897 | /* extract the direct data */ |
1898 | memset(header, 0, sizeof(*header)); |
1899 | header->length = get_bigendian_uint32(&rawheader[8]); |
1900 | header->version = get_bigendian_uint32(&rawheader[12]); |
1901 | |
1902 | /* make sure it's a version we understand */ |
1903 | if (header->version == 0 || header->version > CHD_HEADER_VERSION) |
1904 | return CHDERR_UNSUPPORTED_VERSION; |
1905 | |
1906 | /* make sure the length is expected */ |
1907 | if ((header->version == 1 && header->length != CHD_V1_HEADER_SIZE) || |
1908 | (header->version == 2 && header->length != CHD_V2_HEADER_SIZE) || |
1909 | (header->version == 3 && header->length != CHD_V3_HEADER_SIZE) || |
1910 | (header->version == 4 && header->length != CHD_V4_HEADER_SIZE) || |
1911 | (header->version == 5 && header->length != CHD_V5_HEADER_SIZE)) |
9c659ffe |
1912 | |
ce188d4d |
1913 | return CHDERR_INVALID_DATA; |
1914 | |
1915 | /* extract the common data */ |
1916 | header->flags = get_bigendian_uint32(&rawheader[16]); |
1917 | header->compression[0] = get_bigendian_uint32(&rawheader[20]); |
9c659ffe |
1918 | header->compression[1] = CHD_CODEC_NONE; |
1919 | header->compression[2] = CHD_CODEC_NONE; |
1920 | header->compression[3] = CHD_CODEC_NONE; |
ce188d4d |
1921 | |
1922 | /* extract the V1/V2-specific data */ |
1923 | if (header->version < 3) |
1924 | { |
1925 | int seclen = (header->version == 1) ? CHD_V1_SECTOR_SIZE : get_bigendian_uint32(&rawheader[76]); |
1926 | header->obsolete_hunksize = get_bigendian_uint32(&rawheader[24]); |
1927 | header->totalhunks = get_bigendian_uint32(&rawheader[28]); |
1928 | header->obsolete_cylinders = get_bigendian_uint32(&rawheader[32]); |
1929 | header->obsolete_heads = get_bigendian_uint32(&rawheader[36]); |
1930 | header->obsolete_sectors = get_bigendian_uint32(&rawheader[40]); |
1931 | memcpy(header->md5, &rawheader[44], CHD_MD5_BYTES); |
1932 | memcpy(header->parentmd5, &rawheader[60], CHD_MD5_BYTES); |
1933 | header->logicalbytes = (UINT64)header->obsolete_cylinders * (UINT64)header->obsolete_heads * (UINT64)header->obsolete_sectors * (UINT64)seclen; |
1934 | header->hunkbytes = seclen * header->obsolete_hunksize; |
9c659ffe |
1935 | header->unitbytes = header_guess_unitbytes(chd); |
1936 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
ce188d4d |
1937 | header->metaoffset = 0; |
1938 | } |
1939 | |
1940 | /* extract the V3-specific data */ |
1941 | else if (header->version == 3) |
1942 | { |
1943 | header->totalhunks = get_bigendian_uint32(&rawheader[24]); |
1944 | header->logicalbytes = get_bigendian_uint64(&rawheader[28]); |
1945 | header->metaoffset = get_bigendian_uint64(&rawheader[36]); |
1946 | memcpy(header->md5, &rawheader[44], CHD_MD5_BYTES); |
1947 | memcpy(header->parentmd5, &rawheader[60], CHD_MD5_BYTES); |
1948 | header->hunkbytes = get_bigendian_uint32(&rawheader[76]); |
9c659ffe |
1949 | header->unitbytes = header_guess_unitbytes(chd); |
1950 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
ce188d4d |
1951 | memcpy(header->sha1, &rawheader[80], CHD_SHA1_BYTES); |
1952 | memcpy(header->parentsha1, &rawheader[100], CHD_SHA1_BYTES); |
1953 | } |
1954 | |
1955 | /* extract the V4-specific data */ |
1956 | else if (header->version == 4) |
1957 | { |
1958 | header->totalhunks = get_bigendian_uint32(&rawheader[24]); |
1959 | header->logicalbytes = get_bigendian_uint64(&rawheader[28]); |
1960 | header->metaoffset = get_bigendian_uint64(&rawheader[36]); |
1961 | header->hunkbytes = get_bigendian_uint32(&rawheader[44]); |
9c659ffe |
1962 | header->unitbytes = header_guess_unitbytes(chd); |
1963 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
ce188d4d |
1964 | memcpy(header->sha1, &rawheader[48], CHD_SHA1_BYTES); |
1965 | memcpy(header->parentsha1, &rawheader[68], CHD_SHA1_BYTES); |
1966 | memcpy(header->rawsha1, &rawheader[88], CHD_SHA1_BYTES); |
1967 | } |
1968 | |
1969 | /* extract the V5-specific data */ |
1970 | else if (header->version == 5) |
1971 | { |
1972 | /* TODO */ |
9c659ffe |
1973 | header->compression[0] = get_bigendian_uint32(&rawheader[16]); |
1974 | header->compression[1] = get_bigendian_uint32(&rawheader[20]); |
1975 | header->compression[2] = get_bigendian_uint32(&rawheader[24]); |
1976 | header->compression[3] = get_bigendian_uint32(&rawheader[28]); |
1977 | header->logicalbytes = get_bigendian_uint64(&rawheader[32]); |
1978 | header->mapoffset = get_bigendian_uint64(&rawheader[40]); |
1979 | header->metaoffset = get_bigendian_uint64(&rawheader[48]); |
1980 | header->hunkbytes = get_bigendian_uint32(&rawheader[56]); |
1981 | header->hunkcount = (header->logicalbytes + header->hunkbytes - 1) / header->hunkbytes; |
1982 | header->unitbytes = get_bigendian_uint32(&rawheader[60]); |
1983 | header->unitcount = (header->logicalbytes + header->unitbytes - 1) / header->unitbytes; |
ce188d4d |
1984 | memcpy(header->sha1, &rawheader[84], CHD_SHA1_BYTES); |
1985 | memcpy(header->parentsha1, &rawheader[104], CHD_SHA1_BYTES); |
1986 | memcpy(header->rawsha1, &rawheader[64], CHD_SHA1_BYTES); |
1987 | |
9c659ffe |
1988 | /* determine properties of map entries */ |
1989 | header->mapentrybytes = compressed(header) ? 12 : 4; |
ce188d4d |
1990 | |
9c659ffe |
1991 | /* hack */ |
ce188d4d |
1992 | header->totalhunks = header->hunkcount; |
1993 | } |
1994 | |
1995 | /* Unknown version */ |
9c659ffe |
1996 | else |
ce188d4d |
1997 | { |
1998 | /* TODO */ |
1999 | } |
2000 | |
2001 | /* guess it worked */ |
2002 | return CHDERR_NONE; |
2003 | } |
2004 | |
ce188d4d |
2005 | /*************************************************************************** |
2006 | INTERNAL HUNK READ/WRITE |
2007 | ***************************************************************************/ |
2008 | |
2009 | /*------------------------------------------------- |
9c659ffe |
2010 | hunk_read_compressed - read a compressed |
2011 | hunk |
ce188d4d |
2012 | -------------------------------------------------*/ |
2013 | |
9c659ffe |
2014 | static UINT8* hunk_read_compressed(chd_file *chd, UINT64 offset, size_t size) |
ce188d4d |
2015 | { |
2016 | ssize_t bytes; |
2017 | if (chd->file_cache != NULL) |
2018 | { |
2019 | return chd->file_cache + offset; |
2020 | } |
2021 | else |
2022 | { |
2023 | core_fseek(chd->file, offset, SEEK_SET); |
2024 | bytes = core_fread(chd->file, chd->compressed, size); |
2025 | if (bytes != size) |
2026 | return NULL; |
2027 | return chd->compressed; |
2028 | } |
2029 | } |
2030 | |
9c659ffe |
2031 | /*------------------------------------------------- |
2032 | hunk_read_uncompressed - read an uncompressed |
2033 | hunk |
2034 | -------------------------------------------------*/ |
2035 | |
2036 | static chd_error hunk_read_uncompressed(chd_file *chd, UINT64 offset, size_t size, UINT8 *dest) |
ce188d4d |
2037 | { |
2038 | ssize_t bytes; |
2039 | if (chd->file_cache != NULL) |
2040 | { |
2041 | memcpy(dest, chd->file_cache + offset, size); |
2042 | } |
2043 | else |
2044 | { |
2045 | core_fseek(chd->file, offset, SEEK_SET); |
2046 | bytes = core_fread(chd->file, dest, size); |
2047 | if (bytes != size) |
2048 | return CHDERR_READ_ERROR; |
2049 | } |
2050 | return CHDERR_NONE; |
2051 | } |
2052 | |
9c659ffe |
2053 | /*------------------------------------------------- |
2054 | hunk_read_into_cache - read a hunk into |
2055 | the CHD's hunk cache |
2056 | -------------------------------------------------*/ |
2057 | |
2058 | static chd_error hunk_read_into_cache(chd_file *chd, UINT32 hunknum) |
2059 | { |
2060 | chd_error err; |
2061 | |
2062 | /* track the max */ |
2063 | if (hunknum > chd->maxhunk) |
2064 | chd->maxhunk = hunknum; |
2065 | |
2066 | /* if we're already in the cache, we're done */ |
2067 | if (chd->cachehunk == hunknum) |
2068 | return CHDERR_NONE; |
2069 | chd->cachehunk = ~0; |
2070 | |
2071 | /* otherwise, read the data */ |
2072 | err = hunk_read_into_memory(chd, hunknum, chd->cache); |
2073 | if (err != CHDERR_NONE) |
2074 | return err; |
2075 | |
2076 | /* mark the hunk successfully cached in */ |
2077 | chd->cachehunk = hunknum; |
2078 | return CHDERR_NONE; |
2079 | } |
2080 | |
ce188d4d |
2081 | /*------------------------------------------------- |
2082 | hunk_read_into_memory - read a hunk into |
2083 | memory at the given location |
2084 | -------------------------------------------------*/ |
2085 | |
2086 | static chd_error hunk_read_into_memory(chd_file *chd, UINT32 hunknum, UINT8 *dest) |
2087 | { |
2088 | chd_error err; |
2089 | |
9c659ffe |
2090 | /* punt if no file */ |
ce188d4d |
2091 | if (chd->file == NULL) |
2092 | return CHDERR_INVALID_FILE; |
2093 | |
2094 | /* return an error if out of range */ |
2095 | if (hunknum >= chd->header.totalhunks) |
2096 | return CHDERR_HUNK_OUT_OF_RANGE; |
2097 | |
2098 | if (chd->header.version < 5) |
2099 | { |
2100 | map_entry *entry = &chd->map[hunknum]; |
2101 | UINT32 bytes; |
9c659ffe |
2102 | UINT8* compressed_bytes; |
ce188d4d |
2103 | |
2104 | /* switch off the entry type */ |
2105 | switch (entry->flags & MAP_ENTRY_FLAG_TYPE_MASK) |
2106 | { |
2107 | /* compressed data */ |
2108 | case V34_MAP_ENTRY_TYPE_COMPRESSED: |
9c659ffe |
2109 | |
2110 | /* read it into the decompression buffer */ |
2111 | compressed_bytes = hunk_read_compressed(chd, entry->offset, entry->length); |
2112 | if (compressed_bytes == NULL) |
2113 | return CHDERR_READ_ERROR; |
2114 | |
2115 | /* now decompress using the codec */ |
2116 | err = CHDERR_NONE; |
2117 | void* codec = &chd->zlib_codec_data; |
2118 | if (chd->codecintf[0]->decompress != NULL) |
2119 | err = (*chd->codecintf[0]->decompress)(codec, compressed_bytes, entry->length, dest, chd->header.hunkbytes); |
2120 | if (err != CHDERR_NONE) |
2121 | return err; |
ce188d4d |
2122 | break; |
2123 | |
2124 | /* uncompressed data */ |
2125 | case V34_MAP_ENTRY_TYPE_UNCOMPRESSED: |
9c659ffe |
2126 | err = hunk_read_uncompressed(chd, entry->offset, chd->header.hunkbytes, dest); |
ce188d4d |
2127 | if (err != CHDERR_NONE) |
2128 | return err; |
2129 | break; |
2130 | |
2131 | /* mini-compressed data */ |
2132 | case V34_MAP_ENTRY_TYPE_MINI: |
2133 | put_bigendian_uint64(&dest[0], entry->offset); |
2134 | for (bytes = 8; bytes < chd->header.hunkbytes; bytes++) |
2135 | dest[bytes] = dest[bytes - 8]; |
2136 | break; |
2137 | |
2138 | /* self-referenced data */ |
2139 | case V34_MAP_ENTRY_TYPE_SELF_HUNK: |
2140 | if (chd->cachehunk == entry->offset && dest == chd->cache) |
2141 | break; |
2142 | return hunk_read_into_memory(chd, entry->offset, dest); |
2143 | |
2144 | /* parent-referenced data */ |
2145 | case V34_MAP_ENTRY_TYPE_PARENT_HUNK: |
2146 | err = hunk_read_into_memory(chd->parent, entry->offset, dest); |
2147 | if (err != CHDERR_NONE) |
2148 | return err; |
2149 | break; |
2150 | } |
2151 | return CHDERR_NONE; |
2152 | } |
2153 | else |
2154 | { |
9c659ffe |
2155 | /* get a pointer to the map entry */ |
ce188d4d |
2156 | uint64_t blockoffs; |
2157 | uint32_t blocklen; |
2158 | uint16_t blockcrc; |
ce188d4d |
2159 | uint8_t *rawmap = &chd->header.rawmap[chd->header.mapentrybytes * hunknum]; |
9c659ffe |
2160 | UINT8* compressed_bytes; |
ce188d4d |
2161 | |
9c659ffe |
2162 | /* uncompressed case */ |
2163 | if (!compressed(&chd->header)) |
ce188d4d |
2164 | { |
9c659ffe |
2165 | blockoffs = (uint64_t)get_bigendian_uint32(rawmap) * (uint64_t)chd->header.hunkbytes; |
2166 | if (blockoffs != 0) { |
2167 | core_fseek(chd->file, blockoffs, SEEK_SET); |
2168 | core_fread(chd->file, dest, chd->header.hunkbytes); |
2169 | /* TODO |
ce188d4d |
2170 | else if (m_parent_missing) |
9c659ffe |
2171 | throw CHDERR_REQUIRES_PARENT; */ |
2172 | } else if (chd->parent) { |
2173 | err = hunk_read_into_memory(chd->parent, hunknum, dest); |
2174 | if (err != CHDERR_NONE) |
2175 | return err; |
2176 | } else { |
2177 | memset(dest, 0, chd->header.hunkbytes); |
2178 | } |
2179 | } |
ce188d4d |
2180 | |
9c659ffe |
2181 | /* compressed case */ |
ce188d4d |
2182 | blocklen = get_bigendian_uint24(&rawmap[1]); |
2183 | blockoffs = get_bigendian_uint48(&rawmap[4]); |
2184 | blockcrc = get_bigendian_uint16(&rawmap[10]); |
9c659ffe |
2185 | void* codec = NULL; |
ce188d4d |
2186 | switch (rawmap[0]) |
2187 | { |
2188 | case COMPRESSION_TYPE_0: |
2189 | case COMPRESSION_TYPE_1: |
2190 | case COMPRESSION_TYPE_2: |
2191 | case COMPRESSION_TYPE_3: |
9c659ffe |
2192 | compressed_bytes = hunk_read_compressed(chd, blockoffs, blocklen); |
2193 | if (compressed_bytes == NULL) |
ce188d4d |
2194 | return CHDERR_READ_ERROR; |
2195 | switch (chd->codecintf[rawmap[0]]->compression) |
2196 | { |
2197 | case CHD_CODEC_CD_LZMA: |
2198 | codec = &chd->cdlz_codec_data; |
2199 | break; |
2200 | |
9c659ffe |
2201 | case CHD_CODEC_ZLIB: |
2202 | codec = &chd->zlib_codec_data; |
2203 | break; |
2204 | |
ce188d4d |
2205 | case CHD_CODEC_CD_ZLIB: |
2206 | codec = &chd->cdzl_codec_data; |
2207 | break; |
2208 | |
2209 | case CHD_CODEC_CD_FLAC: |
2210 | codec = &chd->cdfl_codec_data; |
2211 | break; |
2212 | } |
2213 | if (codec==NULL) |
2214 | return CHDERR_DECOMPRESSION_ERROR; |
9c659ffe |
2215 | chd->codecintf[rawmap[0]]->decompress(codec, compressed_bytes, blocklen, dest, chd->header.hunkbytes); |
ce188d4d |
2216 | if (dest != NULL && crc16(dest, chd->header.hunkbytes) != blockcrc) |
2217 | return CHDERR_DECOMPRESSION_ERROR; |
2218 | return CHDERR_NONE; |
2219 | |
2220 | case COMPRESSION_NONE: |
9c659ffe |
2221 | err = hunk_read_uncompressed(chd, blockoffs, blocklen, dest); |
ce188d4d |
2222 | if (err != CHDERR_NONE) |
2223 | return err; |
2224 | if (crc16(dest, chd->header.hunkbytes) != blockcrc) |
2225 | return CHDERR_DECOMPRESSION_ERROR; |
2226 | return CHDERR_NONE; |
2227 | |
2228 | case COMPRESSION_SELF: |
2229 | return hunk_read_into_memory(chd, blockoffs, dest); |
2230 | |
2231 | case COMPRESSION_PARENT: |
9c659ffe |
2232 | #if 0 |
2233 | /* TODO */ |
2234 | if (m_parent_missing) |
2235 | return CHDERR_REQUIRES_PARENT; |
2236 | return m_parent->read_bytes(uint64_t(blockoffs) * uint64_t(m_parent->unit_bytes()), dest, m_hunkbytes); |
2237 | #endif |
ce188d4d |
2238 | return CHDERR_DECOMPRESSION_ERROR; |
2239 | } |
2240 | return CHDERR_NONE; |
2241 | } |
2242 | |
9c659ffe |
2243 | /* We should not reach this code */ |
ce188d4d |
2244 | return CHDERR_DECOMPRESSION_ERROR; |
2245 | } |
2246 | |
ce188d4d |
2247 | /*************************************************************************** |
2248 | INTERNAL MAP ACCESS |
2249 | ***************************************************************************/ |
2250 | |
2251 | /*------------------------------------------------- |
2252 | map_read - read the initial sector map |
2253 | -------------------------------------------------*/ |
2254 | |
2255 | static chd_error map_read(chd_file *chd) |
2256 | { |
2257 | UINT32 entrysize = (chd->header.version < 3) ? OLD_MAP_ENTRY_SIZE : MAP_ENTRY_SIZE; |
2258 | UINT8 raw_map_entries[MAP_STACK_ENTRIES * MAP_ENTRY_SIZE]; |
2259 | UINT64 fileoffset, maxoffset = 0; |
2260 | UINT8 cookie[MAP_ENTRY_SIZE]; |
2261 | UINT32 count; |
2262 | chd_error err; |
2263 | int i; |
2264 | |
2265 | /* first allocate memory */ |
2266 | chd->map = (map_entry *)malloc(sizeof(chd->map[0]) * chd->header.totalhunks); |
2267 | if (!chd->map) |
2268 | return CHDERR_OUT_OF_MEMORY; |
2269 | |
2270 | /* read the map entries in in chunks and extract to the map list */ |
2271 | fileoffset = chd->header.length; |
2272 | for (i = 0; i < chd->header.totalhunks; i += MAP_STACK_ENTRIES) |
2273 | { |
2274 | /* compute how many entries this time */ |
2275 | int entries = chd->header.totalhunks - i, j; |
2276 | if (entries > MAP_STACK_ENTRIES) |
2277 | entries = MAP_STACK_ENTRIES; |
2278 | |
2279 | /* read that many */ |
2280 | core_fseek(chd->file, fileoffset, SEEK_SET); |
2281 | count = core_fread(chd->file, raw_map_entries, entries * entrysize); |
2282 | if (count != entries * entrysize) |
2283 | { |
2284 | err = CHDERR_READ_ERROR; |
2285 | goto cleanup; |
2286 | } |
2287 | fileoffset += entries * entrysize; |
2288 | |
2289 | /* process that many */ |
2290 | if (entrysize == MAP_ENTRY_SIZE) |
2291 | { |
2292 | for (j = 0; j < entries; j++) |
2293 | map_extract(&raw_map_entries[j * MAP_ENTRY_SIZE], &chd->map[i + j]); |
2294 | } |
2295 | else |
2296 | { |
2297 | for (j = 0; j < entries; j++) |
2298 | map_extract_old(&raw_map_entries[j * OLD_MAP_ENTRY_SIZE], &chd->map[i + j], chd->header.hunkbytes); |
2299 | } |
2300 | |
2301 | /* track the maximum offset */ |
2302 | for (j = 0; j < entries; j++) |
2303 | if ((chd->map[i + j].flags & MAP_ENTRY_FLAG_TYPE_MASK) == V34_MAP_ENTRY_TYPE_COMPRESSED || |
2304 | (chd->map[i + j].flags & MAP_ENTRY_FLAG_TYPE_MASK) == V34_MAP_ENTRY_TYPE_UNCOMPRESSED) |
2305 | maxoffset = MAX(maxoffset, chd->map[i + j].offset + chd->map[i + j].length); |
2306 | } |
2307 | |
2308 | /* verify the cookie */ |
2309 | core_fseek(chd->file, fileoffset, SEEK_SET); |
2310 | count = core_fread(chd->file, &cookie, entrysize); |
2311 | if (count != entrysize || memcmp(&cookie, END_OF_LIST_COOKIE, entrysize)) |
2312 | { |
2313 | err = CHDERR_INVALID_FILE; |
2314 | goto cleanup; |
2315 | } |
2316 | |
2317 | /* verify the length */ |
2318 | if (maxoffset > core_fsize(chd->file)) |
2319 | { |
2320 | err = CHDERR_INVALID_FILE; |
2321 | goto cleanup; |
2322 | } |
2323 | return CHDERR_NONE; |
2324 | |
2325 | cleanup: |
2326 | if (chd->map) |
2327 | free(chd->map); |
2328 | chd->map = NULL; |
2329 | return err; |
2330 | } |
2331 | |
ce188d4d |
2332 | /*************************************************************************** |
2333 | INTERNAL METADATA ACCESS |
2334 | ***************************************************************************/ |
2335 | |
2336 | /*------------------------------------------------- |
2337 | metadata_find_entry - find a metadata entry |
2338 | -------------------------------------------------*/ |
2339 | |
2340 | static chd_error metadata_find_entry(chd_file *chd, UINT32 metatag, UINT32 metaindex, metadata_entry *metaentry) |
2341 | { |
2342 | /* start at the beginning */ |
2343 | metaentry->offset = chd->header.metaoffset; |
2344 | metaentry->prev = 0; |
2345 | |
2346 | /* loop until we run out of options */ |
2347 | while (metaentry->offset != 0) |
2348 | { |
2349 | UINT8 raw_meta_header[METADATA_HEADER_SIZE]; |
2350 | UINT32 count; |
2351 | |
2352 | /* read the raw header */ |
2353 | core_fseek(chd->file, metaentry->offset, SEEK_SET); |
2354 | count = core_fread(chd->file, raw_meta_header, sizeof(raw_meta_header)); |
2355 | if (count != sizeof(raw_meta_header)) |
2356 | break; |
2357 | |
2358 | /* extract the data */ |
2359 | metaentry->metatag = get_bigendian_uint32(&raw_meta_header[0]); |
2360 | metaentry->length = get_bigendian_uint32(&raw_meta_header[4]); |
2361 | metaentry->next = get_bigendian_uint64(&raw_meta_header[8]); |
2362 | |
2363 | /* flags are encoded in the high byte of length */ |
2364 | metaentry->flags = metaentry->length >> 24; |
2365 | metaentry->length &= 0x00ffffff; |
2366 | |
2367 | /* if we got a match, proceed */ |
2368 | if (metatag == CHDMETATAG_WILDCARD || metaentry->metatag == metatag) |
2369 | if (metaindex-- == 0) |
2370 | return CHDERR_NONE; |
2371 | |
2372 | /* no match, fetch the next link */ |
2373 | metaentry->prev = metaentry->offset; |
2374 | metaentry->offset = metaentry->next; |
2375 | } |
2376 | |
2377 | /* if we get here, we didn't find it */ |
2378 | return CHDERR_METADATA_NOT_FOUND; |
2379 | } |
2380 | |
ce188d4d |
2381 | /*************************************************************************** |
2382 | ZLIB COMPRESSION CODEC |
2383 | ***************************************************************************/ |
2384 | |
2385 | /*------------------------------------------------- |
2386 | zlib_codec_init - initialize the ZLIB codec |
2387 | -------------------------------------------------*/ |
2388 | |
2389 | static chd_error zlib_codec_init(void *codec, uint32_t hunkbytes) |
2390 | { |
2391 | zlib_codec_data *data = (zlib_codec_data*)codec; |
2392 | chd_error err; |
2393 | int zerr; |
2394 | |
2395 | /* clear the buffers */ |
2396 | memset(data, 0, sizeof(zlib_codec_data)); |
2397 | |
2398 | /* init the inflater first */ |
2399 | data->inflater.next_in = (Bytef *)data; /* bogus, but that's ok */ |
2400 | data->inflater.avail_in = 0; |
2401 | data->inflater.zalloc = zlib_fast_alloc; |
2402 | data->inflater.zfree = zlib_fast_free; |
2403 | data->inflater.opaque = &data->allocator; |
2404 | zerr = inflateInit2(&data->inflater, -MAX_WBITS); |
2405 | |
2406 | /* convert errors */ |
2407 | if (zerr == Z_MEM_ERROR) |
2408 | err = CHDERR_OUT_OF_MEMORY; |
2409 | else if (zerr != Z_OK) |
2410 | err = CHDERR_CODEC_ERROR; |
2411 | else |
2412 | err = CHDERR_NONE; |
2413 | |
2414 | /* handle an error */ |
2415 | if (err != CHDERR_NONE) |
2416 | free(data); |
2417 | |
2418 | return err; |
2419 | } |
2420 | |
ce188d4d |
2421 | /*------------------------------------------------- |
2422 | zlib_codec_free - free data for the ZLIB |
2423 | codec |
2424 | -------------------------------------------------*/ |
2425 | |
2426 | static void zlib_codec_free(void *codec) |
2427 | { |
2428 | zlib_codec_data *data = (zlib_codec_data *)codec; |
2429 | |
2430 | /* deinit the streams */ |
2431 | if (data != NULL) |
2432 | { |
2433 | int i; |
ce188d4d |
2434 | |
2435 | inflateEnd(&data->inflater); |
2436 | |
2437 | /* free our fast memory */ |
9c659ffe |
2438 | zlib_allocator alloc = data->allocator; |
ce188d4d |
2439 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
2440 | if (alloc.allocptr[i]) |
2441 | free(alloc.allocptr[i]); |
2442 | } |
2443 | } |
2444 | |
ce188d4d |
2445 | /*------------------------------------------------- |
2446 | zlib_codec_decompress - decomrpess data using |
2447 | the ZLIB codec |
2448 | -------------------------------------------------*/ |
2449 | |
2450 | static chd_error zlib_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen) |
2451 | { |
2452 | zlib_codec_data *data = (zlib_codec_data *)codec; |
2453 | int zerr; |
2454 | |
2455 | /* reset the decompressor */ |
2456 | data->inflater.next_in = (Bytef *)src; |
2457 | data->inflater.avail_in = complen; |
2458 | data->inflater.total_in = 0; |
2459 | data->inflater.next_out = (Bytef *)dest; |
2460 | data->inflater.avail_out = destlen; |
2461 | data->inflater.total_out = 0; |
2462 | zerr = inflateReset(&data->inflater); |
2463 | if (zerr != Z_OK) |
2464 | return CHDERR_DECOMPRESSION_ERROR; |
2465 | |
2466 | /* do it */ |
2467 | zerr = inflate(&data->inflater, Z_FINISH); |
2468 | if (data->inflater.total_out != destlen) |
2469 | return CHDERR_DECOMPRESSION_ERROR; |
2470 | |
2471 | return CHDERR_NONE; |
2472 | } |
2473 | |
ce188d4d |
2474 | /*------------------------------------------------- |
2475 | zlib_fast_alloc - fast malloc for ZLIB, which |
2476 | allocates and frees memory frequently |
2477 | -------------------------------------------------*/ |
2478 | |
2479 | static voidpf zlib_fast_alloc(voidpf opaque, uInt items, uInt size) |
2480 | { |
2481 | zlib_allocator *alloc = (zlib_allocator *)opaque; |
2482 | UINT32 *ptr; |
2483 | int i; |
2484 | |
2485 | /* compute the size, rounding to the nearest 1k */ |
2486 | size = (size * items + 0x3ff) & ~0x3ff; |
2487 | |
2488 | /* reuse a hunk if we can */ |
2489 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
2490 | { |
2491 | ptr = alloc->allocptr[i]; |
2492 | if (ptr && size == *ptr) |
2493 | { |
2494 | /* set the low bit of the size so we don't match next time */ |
2495 | *ptr |= 1; |
2496 | return ptr + 1; |
2497 | } |
2498 | } |
2499 | |
2500 | /* alloc a new one */ |
9c659ffe |
2501 | ptr = (UINT32 *)malloc(size + sizeof(uintptr_t)); |
ce188d4d |
2502 | if (!ptr) |
2503 | return NULL; |
2504 | |
2505 | /* put it into the list */ |
2506 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
2507 | if (!alloc->allocptr[i]) |
2508 | { |
2509 | alloc->allocptr[i] = ptr; |
2510 | break; |
2511 | } |
2512 | |
2513 | /* set the low bit of the size so we don't match next time */ |
2514 | *ptr = size | 1; |
9c659ffe |
2515 | return ptr + (sizeof(uint32_t) == sizeof(uintptr_t) ? 1 : 2); |
ce188d4d |
2516 | } |
2517 | |
ce188d4d |
2518 | /*------------------------------------------------- |
2519 | zlib_fast_free - fast free for ZLIB, which |
2520 | allocates and frees memory frequently |
2521 | -------------------------------------------------*/ |
2522 | |
2523 | static void zlib_fast_free(voidpf opaque, voidpf address) |
2524 | { |
2525 | zlib_allocator *alloc = (zlib_allocator *)opaque; |
9c659ffe |
2526 | UINT32 *ptr = (UINT32 *)address - (sizeof(uint32_t) == sizeof(uintptr_t) ? 1 : 2); |
ce188d4d |
2527 | int i; |
2528 | |
2529 | /* find the hunk */ |
2530 | for (i = 0; i < MAX_ZLIB_ALLOCS; i++) |
2531 | if (ptr == alloc->allocptr[i]) |
2532 | { |
2533 | /* clear the low bit of the size to allow matches */ |
2534 | *ptr &= ~1; |
2535 | return; |
2536 | } |
2537 | } |