xref: /freebsd/sys/contrib/zstd/lib/legacy/zstd_legacy.h (revision 8ddb146abcdf061be9f2c0db7e391697dafad85c) 
1 /*
2  * Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
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)
15 extern "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 */
56 MEM_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 
89 MEM_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 
121 MEM_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 
181 MEM_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     return frameSizeInfo;
246 }
247 
248 MEM_STATIC size_t ZSTD_findFrameCompressedSizeLegacy(const void *src, size_t srcSize)
249 {
250     ZSTD_frameSizeInfo frameSizeInfo = ZSTD_findFrameSizeInfoLegacy(src, srcSize);
251     return frameSizeInfo.compressedSize;
252 }
253 
254 MEM_STATIC size_t ZSTD_freeLegacyStreamContext(void* legacyContext, U32 version)
255 {
256     switch(version)
257     {
258         default :
259         case 1 :
260         case 2 :
261         case 3 :
262             (void)legacyContext;
263             return ERROR(version_unsupported);
264 #if (ZSTD_LEGACY_SUPPORT <= 4)
265         case 4 : return ZBUFFv04_freeDCtx((ZBUFFv04_DCtx*)legacyContext);
266 #endif
267 #if (ZSTD_LEGACY_SUPPORT <= 5)
268         case 5 : return ZBUFFv05_freeDCtx((ZBUFFv05_DCtx*)legacyContext);
269 #endif
270 #if (ZSTD_LEGACY_SUPPORT <= 6)
271         case 6 : return ZBUFFv06_freeDCtx((ZBUFFv06_DCtx*)legacyContext);
272 #endif
273 #if (ZSTD_LEGACY_SUPPORT <= 7)
274         case 7 : return ZBUFFv07_freeDCtx((ZBUFFv07_DCtx*)legacyContext);
275 #endif
276     }
277 }
278 
279 
280 MEM_STATIC size_t ZSTD_initLegacyStream(void** legacyContext, U32 prevVersion, U32 newVersion,
281                                         const void* dict, size_t dictSize)
282 {
283     DEBUGLOG(5, "ZSTD_initLegacyStream for v0.%u", newVersion);
284     if (prevVersion != newVersion) ZSTD_freeLegacyStreamContext(*legacyContext, prevVersion);
285     switch(newVersion)
286     {
287         default :
288         case 1 :
289         case 2 :
290         case 3 :
291             (void)dict; (void)dictSize;
292             return 0;
293 #if (ZSTD_LEGACY_SUPPORT <= 4)
294         case 4 :
295         {
296             ZBUFFv04_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv04_createDCtx() : (ZBUFFv04_DCtx*)*legacyContext;
297             if (dctx==NULL) return ERROR(memory_allocation);
298             ZBUFFv04_decompressInit(dctx);
299             ZBUFFv04_decompressWithDictionary(dctx, dict, dictSize);
300             *legacyContext = dctx;
301             return 0;
302         }
303 #endif
304 #if (ZSTD_LEGACY_SUPPORT <= 5)
305         case 5 :
306         {
307             ZBUFFv05_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv05_createDCtx() : (ZBUFFv05_DCtx*)*legacyContext;
308             if (dctx==NULL) return ERROR(memory_allocation);
309             ZBUFFv05_decompressInitDictionary(dctx, dict, dictSize);
310             *legacyContext = dctx;
311             return 0;
312         }
313 #endif
314 #if (ZSTD_LEGACY_SUPPORT <= 6)
315         case 6 :
316         {
317             ZBUFFv06_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv06_createDCtx() : (ZBUFFv06_DCtx*)*legacyContext;
318             if (dctx==NULL) return ERROR(memory_allocation);
319             ZBUFFv06_decompressInitDictionary(dctx, dict, dictSize);
320             *legacyContext = dctx;
321             return 0;
322         }
323 #endif
324 #if (ZSTD_LEGACY_SUPPORT <= 7)
325         case 7 :
326         {
327             ZBUFFv07_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv07_createDCtx() : (ZBUFFv07_DCtx*)*legacyContext;
328             if (dctx==NULL) return ERROR(memory_allocation);
329             ZBUFFv07_decompressInitDictionary(dctx, dict, dictSize);
330             *legacyContext = dctx;
331             return 0;
332         }
333 #endif
334     }
335 }
336 
337 
338 
339 MEM_STATIC size_t ZSTD_decompressLegacyStream(void* legacyContext, U32 version,
340                                               ZSTD_outBuffer* output, ZSTD_inBuffer* input)
341 {
342     DEBUGLOG(5, "ZSTD_decompressLegacyStream for v0.%u", version);
343     switch(version)
344     {
345         default :
346         case 1 :
347         case 2 :
348         case 3 :
349             (void)legacyContext; (void)output; (void)input;
350             return ERROR(version_unsupported);
351 #if (ZSTD_LEGACY_SUPPORT <= 4)
352         case 4 :
353             {
354                 ZBUFFv04_DCtx* dctx = (ZBUFFv04_DCtx*) legacyContext;
355                 const void* src = (const char*)input->src + input->pos;
356                 size_t readSize = input->size - input->pos;
357                 void* dst = (char*)output->dst + output->pos;
358                 size_t decodedSize = output->size - output->pos;
359                 size_t const hintSize = ZBUFFv04_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
360                 output->pos += decodedSize;
361                 input->pos += readSize;
362                 return hintSize;
363             }
364 #endif
365 #if (ZSTD_LEGACY_SUPPORT <= 5)
366         case 5 :
367             {
368                 ZBUFFv05_DCtx* dctx = (ZBUFFv05_DCtx*) legacyContext;
369                 const void* src = (const char*)input->src + input->pos;
370                 size_t readSize = input->size - input->pos;
371                 void* dst = (char*)output->dst + output->pos;
372                 size_t decodedSize = output->size - output->pos;
373                 size_t const hintSize = ZBUFFv05_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
374                 output->pos += decodedSize;
375                 input->pos += readSize;
376                 return hintSize;
377             }
378 #endif
379 #if (ZSTD_LEGACY_SUPPORT <= 6)
380         case 6 :
381             {
382                 ZBUFFv06_DCtx* dctx = (ZBUFFv06_DCtx*) legacyContext;
383                 const void* src = (const char*)input->src + input->pos;
384                 size_t readSize = input->size - input->pos;
385                 void* dst = (char*)output->dst + output->pos;
386                 size_t decodedSize = output->size - output->pos;
387                 size_t const hintSize = ZBUFFv06_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
388                 output->pos += decodedSize;
389                 input->pos += readSize;
390                 return hintSize;
391             }
392 #endif
393 #if (ZSTD_LEGACY_SUPPORT <= 7)
394         case 7 :
395             {
396                 ZBUFFv07_DCtx* dctx = (ZBUFFv07_DCtx*) legacyContext;
397                 const void* src = (const char*)input->src + input->pos;
398                 size_t readSize = input->size - input->pos;
399                 void* dst = (char*)output->dst + output->pos;
400                 size_t decodedSize = output->size - output->pos;
401                 size_t const hintSize = ZBUFFv07_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
402                 output->pos += decodedSize;
403                 input->pos += readSize;
404                 return hintSize;
405             }
406 #endif
407     }
408 }
409 
410 
411 #if defined (__cplusplus)
412 }
413 #endif
414 
415 #endif   /* ZSTD_LEGACY_H */
416