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git subrepo pull (merge) --force deps/libchdr
[pcsx_rearmed.git] / deps / libchdr / deps / zstd-1.5.5 / lib / legacy / zstd_legacy.h
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648db22b 1/*
2 * Copyright (c) Meta Platforms, Inc. and affiliates.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11#ifndef ZSTD_LEGACY_H
12#define ZSTD_LEGACY_H
13
14#if defined (__cplusplus)
15extern "C" {
16#endif
17
18/* *************************************
19* Includes
20***************************************/
21#include "../common/mem.h" /* MEM_STATIC */
22#include "../common/error_private.h" /* ERROR */
23#include "../common/zstd_internal.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTD_frameSizeInfo */
24
25#if !defined (ZSTD_LEGACY_SUPPORT) || (ZSTD_LEGACY_SUPPORT == 0)
26# undef ZSTD_LEGACY_SUPPORT
27# define ZSTD_LEGACY_SUPPORT 8
28#endif
29
30#if (ZSTD_LEGACY_SUPPORT <= 1)
31# include "zstd_v01.h"
32#endif
33#if (ZSTD_LEGACY_SUPPORT <= 2)
34# include "zstd_v02.h"
35#endif
36#if (ZSTD_LEGACY_SUPPORT <= 3)
37# include "zstd_v03.h"
38#endif
39#if (ZSTD_LEGACY_SUPPORT <= 4)
40# include "zstd_v04.h"
41#endif
42#if (ZSTD_LEGACY_SUPPORT <= 5)
43# include "zstd_v05.h"
44#endif
45#if (ZSTD_LEGACY_SUPPORT <= 6)
46# include "zstd_v06.h"
47#endif
48#if (ZSTD_LEGACY_SUPPORT <= 7)
49# include "zstd_v07.h"
50#endif
51
52/** ZSTD_isLegacy() :
53 @return : > 0 if supported by legacy decoder. 0 otherwise.
54 return value is the version.
55*/
56MEM_STATIC unsigned ZSTD_isLegacy(const void* src, size_t srcSize)
57{
58 U32 magicNumberLE;
59 if (srcSize<4) return 0;
60 magicNumberLE = MEM_readLE32(src);
61 switch(magicNumberLE)
62 {
63#if (ZSTD_LEGACY_SUPPORT <= 1)
64 case ZSTDv01_magicNumberLE:return 1;
65#endif
66#if (ZSTD_LEGACY_SUPPORT <= 2)
67 case ZSTDv02_magicNumber : return 2;
68#endif
69#if (ZSTD_LEGACY_SUPPORT <= 3)
70 case ZSTDv03_magicNumber : return 3;
71#endif
72#if (ZSTD_LEGACY_SUPPORT <= 4)
73 case ZSTDv04_magicNumber : return 4;
74#endif
75#if (ZSTD_LEGACY_SUPPORT <= 5)
76 case ZSTDv05_MAGICNUMBER : return 5;
77#endif
78#if (ZSTD_LEGACY_SUPPORT <= 6)
79 case ZSTDv06_MAGICNUMBER : return 6;
80#endif
81#if (ZSTD_LEGACY_SUPPORT <= 7)
82 case ZSTDv07_MAGICNUMBER : return 7;
83#endif
84 default : return 0;
85 }
86}
87
88
89MEM_STATIC unsigned long long ZSTD_getDecompressedSize_legacy(const void* src, size_t srcSize)
90{
91 U32 const version = ZSTD_isLegacy(src, srcSize);
92 if (version < 5) return 0; /* no decompressed size in frame header, or not a legacy format */
93#if (ZSTD_LEGACY_SUPPORT <= 5)
94 if (version==5) {
95 ZSTDv05_parameters fParams;
96 size_t const frResult = ZSTDv05_getFrameParams(&fParams, src, srcSize);
97 if (frResult != 0) return 0;
98 return fParams.srcSize;
99 }
100#endif
101#if (ZSTD_LEGACY_SUPPORT <= 6)
102 if (version==6) {
103 ZSTDv06_frameParams fParams;
104 size_t const frResult = ZSTDv06_getFrameParams(&fParams, src, srcSize);
105 if (frResult != 0) return 0;
106 return fParams.frameContentSize;
107 }
108#endif
109#if (ZSTD_LEGACY_SUPPORT <= 7)
110 if (version==7) {
111 ZSTDv07_frameParams fParams;
112 size_t const frResult = ZSTDv07_getFrameParams(&fParams, src, srcSize);
113 if (frResult != 0) return 0;
114 return fParams.frameContentSize;
115 }
116#endif
117 return 0; /* should not be possible */
118}
119
120
121MEM_STATIC size_t ZSTD_decompressLegacy(
122 void* dst, size_t dstCapacity,
123 const void* src, size_t compressedSize,
124 const void* dict,size_t dictSize)
125{
126 U32 const version = ZSTD_isLegacy(src, compressedSize);
127 (void)dst; (void)dstCapacity; (void)dict; (void)dictSize; /* unused when ZSTD_LEGACY_SUPPORT >= 8 */
128 switch(version)
129 {
130#if (ZSTD_LEGACY_SUPPORT <= 1)
131 case 1 :
132 return ZSTDv01_decompress(dst, dstCapacity, src, compressedSize);
133#endif
134#if (ZSTD_LEGACY_SUPPORT <= 2)
135 case 2 :
136 return ZSTDv02_decompress(dst, dstCapacity, src, compressedSize);
137#endif
138#if (ZSTD_LEGACY_SUPPORT <= 3)
139 case 3 :
140 return ZSTDv03_decompress(dst, dstCapacity, src, compressedSize);
141#endif
142#if (ZSTD_LEGACY_SUPPORT <= 4)
143 case 4 :
144 return ZSTDv04_decompress(dst, dstCapacity, src, compressedSize);
145#endif
146#if (ZSTD_LEGACY_SUPPORT <= 5)
147 case 5 :
148 { size_t result;
149 ZSTDv05_DCtx* const zd = ZSTDv05_createDCtx();
150 if (zd==NULL) return ERROR(memory_allocation);
151 result = ZSTDv05_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
152 ZSTDv05_freeDCtx(zd);
153 return result;
154 }
155#endif
156#if (ZSTD_LEGACY_SUPPORT <= 6)
157 case 6 :
158 { size_t result;
159 ZSTDv06_DCtx* const zd = ZSTDv06_createDCtx();
160 if (zd==NULL) return ERROR(memory_allocation);
161 result = ZSTDv06_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
162 ZSTDv06_freeDCtx(zd);
163 return result;
164 }
165#endif
166#if (ZSTD_LEGACY_SUPPORT <= 7)
167 case 7 :
168 { size_t result;
169 ZSTDv07_DCtx* const zd = ZSTDv07_createDCtx();
170 if (zd==NULL) return ERROR(memory_allocation);
171 result = ZSTDv07_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
172 ZSTDv07_freeDCtx(zd);
173 return result;
174 }
175#endif
176 default :
177 return ERROR(prefix_unknown);
178 }
179}
180
181MEM_STATIC ZSTD_frameSizeInfo ZSTD_findFrameSizeInfoLegacy(const void *src, size_t srcSize)
182{
183 ZSTD_frameSizeInfo frameSizeInfo;
184 U32 const version = ZSTD_isLegacy(src, srcSize);
185 switch(version)
186 {
187#if (ZSTD_LEGACY_SUPPORT <= 1)
188 case 1 :
189 ZSTDv01_findFrameSizeInfoLegacy(src, srcSize,
190 &frameSizeInfo.compressedSize,
191 &frameSizeInfo.decompressedBound);
192 break;
193#endif
194#if (ZSTD_LEGACY_SUPPORT <= 2)
195 case 2 :
196 ZSTDv02_findFrameSizeInfoLegacy(src, srcSize,
197 &frameSizeInfo.compressedSize,
198 &frameSizeInfo.decompressedBound);
199 break;
200#endif
201#if (ZSTD_LEGACY_SUPPORT <= 3)
202 case 3 :
203 ZSTDv03_findFrameSizeInfoLegacy(src, srcSize,
204 &frameSizeInfo.compressedSize,
205 &frameSizeInfo.decompressedBound);
206 break;
207#endif
208#if (ZSTD_LEGACY_SUPPORT <= 4)
209 case 4 :
210 ZSTDv04_findFrameSizeInfoLegacy(src, srcSize,
211 &frameSizeInfo.compressedSize,
212 &frameSizeInfo.decompressedBound);
213 break;
214#endif
215#if (ZSTD_LEGACY_SUPPORT <= 5)
216 case 5 :
217 ZSTDv05_findFrameSizeInfoLegacy(src, srcSize,
218 &frameSizeInfo.compressedSize,
219 &frameSizeInfo.decompressedBound);
220 break;
221#endif
222#if (ZSTD_LEGACY_SUPPORT <= 6)
223 case 6 :
224 ZSTDv06_findFrameSizeInfoLegacy(src, srcSize,
225 &frameSizeInfo.compressedSize,
226 &frameSizeInfo.decompressedBound);
227 break;
228#endif
229#if (ZSTD_LEGACY_SUPPORT <= 7)
230 case 7 :
231 ZSTDv07_findFrameSizeInfoLegacy(src, srcSize,
232 &frameSizeInfo.compressedSize,
233 &frameSizeInfo.decompressedBound);
234 break;
235#endif
236 default :
237 frameSizeInfo.compressedSize = ERROR(prefix_unknown);
238 frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
239 break;
240 }
241 if (!ZSTD_isError(frameSizeInfo.compressedSize) && frameSizeInfo.compressedSize > srcSize) {
242 frameSizeInfo.compressedSize = ERROR(srcSize_wrong);
243 frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
244 }
245 /* In all cases, decompressedBound == nbBlocks * ZSTD_BLOCKSIZE_MAX.
246 * So we can compute nbBlocks without having to change every function.
247 */
248 if (frameSizeInfo.decompressedBound != ZSTD_CONTENTSIZE_ERROR) {
249 assert((frameSizeInfo.decompressedBound & (ZSTD_BLOCKSIZE_MAX - 1)) == 0);
250 frameSizeInfo.nbBlocks = (size_t)(frameSizeInfo.decompressedBound / ZSTD_BLOCKSIZE_MAX);
251 }
252 return frameSizeInfo;
253}
254
255MEM_STATIC size_t ZSTD_findFrameCompressedSizeLegacy(const void *src, size_t srcSize)
256{
257 ZSTD_frameSizeInfo frameSizeInfo = ZSTD_findFrameSizeInfoLegacy(src, srcSize);
258 return frameSizeInfo.compressedSize;
259}
260
261MEM_STATIC size_t ZSTD_freeLegacyStreamContext(void* legacyContext, U32 version)
262{
263 switch(version)
264 {
265 default :
266 case 1 :
267 case 2 :
268 case 3 :
269 (void)legacyContext;
270 return ERROR(version_unsupported);
271#if (ZSTD_LEGACY_SUPPORT <= 4)
272 case 4 : return ZBUFFv04_freeDCtx((ZBUFFv04_DCtx*)legacyContext);
273#endif
274#if (ZSTD_LEGACY_SUPPORT <= 5)
275 case 5 : return ZBUFFv05_freeDCtx((ZBUFFv05_DCtx*)legacyContext);
276#endif
277#if (ZSTD_LEGACY_SUPPORT <= 6)
278 case 6 : return ZBUFFv06_freeDCtx((ZBUFFv06_DCtx*)legacyContext);
279#endif
280#if (ZSTD_LEGACY_SUPPORT <= 7)
281 case 7 : return ZBUFFv07_freeDCtx((ZBUFFv07_DCtx*)legacyContext);
282#endif
283 }
284}
285
286
287MEM_STATIC size_t ZSTD_initLegacyStream(void** legacyContext, U32 prevVersion, U32 newVersion,
288 const void* dict, size_t dictSize)
289{
290 DEBUGLOG(5, "ZSTD_initLegacyStream for v0.%u", newVersion);
291 if (prevVersion != newVersion) ZSTD_freeLegacyStreamContext(*legacyContext, prevVersion);
292 switch(newVersion)
293 {
294 default :
295 case 1 :
296 case 2 :
297 case 3 :
298 (void)dict; (void)dictSize;
299 return 0;
300#if (ZSTD_LEGACY_SUPPORT <= 4)
301 case 4 :
302 {
303 ZBUFFv04_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv04_createDCtx() : (ZBUFFv04_DCtx*)*legacyContext;
304 if (dctx==NULL) return ERROR(memory_allocation);
305 ZBUFFv04_decompressInit(dctx);
306 ZBUFFv04_decompressWithDictionary(dctx, dict, dictSize);
307 *legacyContext = dctx;
308 return 0;
309 }
310#endif
311#if (ZSTD_LEGACY_SUPPORT <= 5)
312 case 5 :
313 {
314 ZBUFFv05_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv05_createDCtx() : (ZBUFFv05_DCtx*)*legacyContext;
315 if (dctx==NULL) return ERROR(memory_allocation);
316 ZBUFFv05_decompressInitDictionary(dctx, dict, dictSize);
317 *legacyContext = dctx;
318 return 0;
319 }
320#endif
321#if (ZSTD_LEGACY_SUPPORT <= 6)
322 case 6 :
323 {
324 ZBUFFv06_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv06_createDCtx() : (ZBUFFv06_DCtx*)*legacyContext;
325 if (dctx==NULL) return ERROR(memory_allocation);
326 ZBUFFv06_decompressInitDictionary(dctx, dict, dictSize);
327 *legacyContext = dctx;
328 return 0;
329 }
330#endif
331#if (ZSTD_LEGACY_SUPPORT <= 7)
332 case 7 :
333 {
334 ZBUFFv07_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv07_createDCtx() : (ZBUFFv07_DCtx*)*legacyContext;
335 if (dctx==NULL) return ERROR(memory_allocation);
336 ZBUFFv07_decompressInitDictionary(dctx, dict, dictSize);
337 *legacyContext = dctx;
338 return 0;
339 }
340#endif
341 }
342}
343
344
345
346MEM_STATIC size_t ZSTD_decompressLegacyStream(void* legacyContext, U32 version,
347 ZSTD_outBuffer* output, ZSTD_inBuffer* input)
348{
349 DEBUGLOG(5, "ZSTD_decompressLegacyStream for v0.%u", version);
350 switch(version)
351 {
352 default :
353 case 1 :
354 case 2 :
355 case 3 :
356 (void)legacyContext; (void)output; (void)input;
357 return ERROR(version_unsupported);
358#if (ZSTD_LEGACY_SUPPORT <= 4)
359 case 4 :
360 {
361 ZBUFFv04_DCtx* dctx = (ZBUFFv04_DCtx*) legacyContext;
362 const void* src = (const char*)input->src + input->pos;
363 size_t readSize = input->size - input->pos;
364 void* dst = (char*)output->dst + output->pos;
365 size_t decodedSize = output->size - output->pos;
366 size_t const hintSize = ZBUFFv04_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
367 output->pos += decodedSize;
368 input->pos += readSize;
369 return hintSize;
370 }
371#endif
372#if (ZSTD_LEGACY_SUPPORT <= 5)
373 case 5 :
374 {
375 ZBUFFv05_DCtx* dctx = (ZBUFFv05_DCtx*) legacyContext;
376 const void* src = (const char*)input->src + input->pos;
377 size_t readSize = input->size - input->pos;
378 void* dst = (char*)output->dst + output->pos;
379 size_t decodedSize = output->size - output->pos;
380 size_t const hintSize = ZBUFFv05_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
381 output->pos += decodedSize;
382 input->pos += readSize;
383 return hintSize;
384 }
385#endif
386#if (ZSTD_LEGACY_SUPPORT <= 6)
387 case 6 :
388 {
389 ZBUFFv06_DCtx* dctx = (ZBUFFv06_DCtx*) legacyContext;
390 const void* src = (const char*)input->src + input->pos;
391 size_t readSize = input->size - input->pos;
392 void* dst = (char*)output->dst + output->pos;
393 size_t decodedSize = output->size - output->pos;
394 size_t const hintSize = ZBUFFv06_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
395 output->pos += decodedSize;
396 input->pos += readSize;
397 return hintSize;
398 }
399#endif
400#if (ZSTD_LEGACY_SUPPORT <= 7)
401 case 7 :
402 {
403 ZBUFFv07_DCtx* dctx = (ZBUFFv07_DCtx*) legacyContext;
404 const void* src = (const char*)input->src + input->pos;
405 size_t readSize = input->size - input->pos;
406 void* dst = (char*)output->dst + output->pos;
407 size_t decodedSize = output->size - output->pos;
408 size_t const hintSize = ZBUFFv07_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
409 output->pos += decodedSize;
410 input->pos += readSize;
411 return hintSize;
412 }
413#endif
414 }
415}
416
417
418#if defined (__cplusplus)
419}
420#endif
421
422#endif /* ZSTD_LEGACY_H */
ARM optimized PCSX fork