1 | /* ****************************************************************** |
---|
2 | Huffman decoder, part of New Generation Entropy library |
---|
3 | Copyright (C) 2013-2016, Yann Collet. |
---|
4 | |
---|
5 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
---|
6 | |
---|
7 | Redistribution and use in source and binary forms, with or without |
---|
8 | modification, are permitted provided that the following conditions are |
---|
9 | met: |
---|
10 | |
---|
11 | * Redistributions of source code must retain the above copyright |
---|
12 | notice, this list of conditions and the following disclaimer. |
---|
13 | * Redistributions in binary form must reproduce the above |
---|
14 | copyright notice, this list of conditions and the following disclaimer |
---|
15 | in the documentation and/or other materials provided with the |
---|
16 | distribution. |
---|
17 | |
---|
18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
---|
19 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
---|
20 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
---|
21 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
---|
22 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
---|
23 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
---|
24 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
---|
25 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
---|
26 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
---|
27 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
---|
28 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
---|
29 | |
---|
30 | You can contact the author at : |
---|
31 | - FSE+HUF source repository : https://github.com/Cyan4973/FiniteStateEntropy |
---|
32 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
---|
33 | ****************************************************************** */ |
---|
34 | |
---|
35 | /* ************************************************************** |
---|
36 | * Compiler specifics |
---|
37 | ****************************************************************/ |
---|
38 | #if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
---|
39 | /* inline is defined */ |
---|
40 | #elif defined(_MSC_VER) |
---|
41 | # define inline __inline |
---|
42 | #else |
---|
43 | # define inline /* disable inline */ |
---|
44 | #endif |
---|
45 | |
---|
46 | |
---|
47 | #ifdef _MSC_VER /* Visual Studio */ |
---|
48 | # define FORCE_INLINE static __forceinline |
---|
49 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
---|
50 | #else |
---|
51 | # ifdef __GNUC__ |
---|
52 | # define FORCE_INLINE static inline __attribute__((always_inline)) |
---|
53 | # else |
---|
54 | # define FORCE_INLINE static inline |
---|
55 | # endif |
---|
56 | #endif |
---|
57 | |
---|
58 | |
---|
59 | /* ************************************************************** |
---|
60 | * Includes |
---|
61 | ****************************************************************/ |
---|
62 | #include <string.h> /* memcpy, memset */ |
---|
63 | #include "bitstream.h" |
---|
64 | #include "fse.h" /* header compression */ |
---|
65 | #define HUF_STATIC_LINKING_ONLY |
---|
66 | #include "huf.h" |
---|
67 | |
---|
68 | |
---|
69 | /* ************************************************************** |
---|
70 | * Error Management |
---|
71 | ****************************************************************/ |
---|
72 | #define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ |
---|
73 | |
---|
74 | |
---|
75 | /*-***************************/ |
---|
76 | /* generic DTableDesc */ |
---|
77 | /*-***************************/ |
---|
78 | |
---|
79 | typedef struct { BYTE maxTableLog; BYTE tableType; BYTE tableLog; BYTE reserved; } DTableDesc; |
---|
80 | |
---|
81 | static DTableDesc HUF_getDTableDesc(const HUF_DTable* table) |
---|
82 | { |
---|
83 | DTableDesc dtd; |
---|
84 | memcpy(&dtd, table, sizeof(dtd)); |
---|
85 | return dtd; |
---|
86 | } |
---|
87 | |
---|
88 | |
---|
89 | /*-***************************/ |
---|
90 | /* single-symbol decoding */ |
---|
91 | /*-***************************/ |
---|
92 | |
---|
93 | typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */ |
---|
94 | |
---|
95 | size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize) |
---|
96 | { |
---|
97 | BYTE huffWeight[HUF_SYMBOLVALUE_MAX + 1]; |
---|
98 | U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; /* large enough for values from 0 to 16 */ |
---|
99 | U32 tableLog = 0; |
---|
100 | U32 nbSymbols = 0; |
---|
101 | size_t iSize; |
---|
102 | void* const dtPtr = DTable + 1; |
---|
103 | HUF_DEltX2* const dt = (HUF_DEltX2*)dtPtr; |
---|
104 | |
---|
105 | HUF_STATIC_ASSERT(sizeof(DTableDesc) == sizeof(HUF_DTable)); |
---|
106 | //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */ |
---|
107 | |
---|
108 | iSize = HUF_readStats(huffWeight, HUF_SYMBOLVALUE_MAX + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); |
---|
109 | if (HUF_isError(iSize)) return iSize; |
---|
110 | |
---|
111 | /* Table header */ |
---|
112 | { DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
113 | if (tableLog > (U32)(dtd.maxTableLog+1)) return ERROR(tableLog_tooLarge); /* DTable too small, huffman tree cannot fit in */ |
---|
114 | dtd.tableType = 0; |
---|
115 | dtd.tableLog = (BYTE)tableLog; |
---|
116 | memcpy(DTable, &dtd, sizeof(dtd)); |
---|
117 | } |
---|
118 | |
---|
119 | /* Prepare ranks */ |
---|
120 | { U32 n, nextRankStart = 0; |
---|
121 | for (n=1; n<tableLog+1; n++) { |
---|
122 | U32 current = nextRankStart; |
---|
123 | nextRankStart += (rankVal[n] << (n-1)); |
---|
124 | rankVal[n] = current; |
---|
125 | } } |
---|
126 | |
---|
127 | /* fill DTable */ |
---|
128 | { U32 n; |
---|
129 | for (n=0; n<nbSymbols; n++) { |
---|
130 | U32 const w = huffWeight[n]; |
---|
131 | U32 const length = (1 << w) >> 1; |
---|
132 | U32 i; |
---|
133 | HUF_DEltX2 D; |
---|
134 | D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); |
---|
135 | for (i = rankVal[w]; i < rankVal[w] + length; i++) |
---|
136 | dt[i] = D; |
---|
137 | rankVal[w] += length; |
---|
138 | } } |
---|
139 | |
---|
140 | return iSize; |
---|
141 | } |
---|
142 | |
---|
143 | |
---|
144 | static BYTE HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog) |
---|
145 | { |
---|
146 | size_t const val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ |
---|
147 | BYTE const c = dt[val].byte; |
---|
148 | BIT_skipBits(Dstream, dt[val].nbBits); |
---|
149 | return c; |
---|
150 | } |
---|
151 | |
---|
152 | #define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ |
---|
153 | *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog) |
---|
154 | |
---|
155 | #define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ |
---|
156 | if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ |
---|
157 | HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
---|
158 | |
---|
159 | #define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ |
---|
160 | if (MEM_64bits()) \ |
---|
161 | HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
---|
162 | |
---|
163 | static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog) |
---|
164 | { |
---|
165 | BYTE* const pStart = p; |
---|
166 | |
---|
167 | /* up to 4 symbols at a time */ |
---|
168 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4)) { |
---|
169 | HUF_DECODE_SYMBOLX2_2(p, bitDPtr); |
---|
170 | HUF_DECODE_SYMBOLX2_1(p, bitDPtr); |
---|
171 | HUF_DECODE_SYMBOLX2_2(p, bitDPtr); |
---|
172 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
---|
173 | } |
---|
174 | |
---|
175 | /* closer to the end */ |
---|
176 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd)) |
---|
177 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
---|
178 | |
---|
179 | /* no more data to retrieve from bitstream, hence no need to reload */ |
---|
180 | while (p < pEnd) |
---|
181 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
---|
182 | |
---|
183 | return pEnd-pStart; |
---|
184 | } |
---|
185 | |
---|
186 | static size_t HUF_decompress1X2_usingDTable_internal( |
---|
187 | void* dst, size_t dstSize, |
---|
188 | const void* cSrc, size_t cSrcSize, |
---|
189 | const HUF_DTable* DTable) |
---|
190 | { |
---|
191 | BYTE* op = (BYTE*)dst; |
---|
192 | BYTE* const oend = op + dstSize; |
---|
193 | const void* dtPtr = DTable + 1; |
---|
194 | const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; |
---|
195 | BIT_DStream_t bitD; |
---|
196 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
197 | U32 const dtLog = dtd.tableLog; |
---|
198 | |
---|
199 | { size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); |
---|
200 | if (HUF_isError(errorCode)) return errorCode; } |
---|
201 | |
---|
202 | HUF_decodeStreamX2(op, &bitD, oend, dt, dtLog); |
---|
203 | |
---|
204 | /* check */ |
---|
205 | if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); |
---|
206 | |
---|
207 | return dstSize; |
---|
208 | } |
---|
209 | |
---|
210 | size_t HUF_decompress1X2_usingDTable( |
---|
211 | void* dst, size_t dstSize, |
---|
212 | const void* cSrc, size_t cSrcSize, |
---|
213 | const HUF_DTable* DTable) |
---|
214 | { |
---|
215 | DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
216 | if (dtd.tableType != 0) return ERROR(GENERIC); |
---|
217 | return HUF_decompress1X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
---|
218 | } |
---|
219 | |
---|
220 | size_t HUF_decompress1X2_DCtx (HUF_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
221 | { |
---|
222 | const BYTE* ip = (const BYTE*) cSrc; |
---|
223 | |
---|
224 | size_t const hSize = HUF_readDTableX2 (DCtx, cSrc, cSrcSize); |
---|
225 | if (HUF_isError(hSize)) return hSize; |
---|
226 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
---|
227 | ip += hSize; cSrcSize -= hSize; |
---|
228 | |
---|
229 | return HUF_decompress1X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); |
---|
230 | } |
---|
231 | |
---|
232 | size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
233 | { |
---|
234 | HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); |
---|
235 | return HUF_decompress1X2_DCtx (DTable, dst, dstSize, cSrc, cSrcSize); |
---|
236 | } |
---|
237 | |
---|
238 | |
---|
239 | static size_t HUF_decompress4X2_usingDTable_internal( |
---|
240 | void* dst, size_t dstSize, |
---|
241 | const void* cSrc, size_t cSrcSize, |
---|
242 | const HUF_DTable* DTable) |
---|
243 | { |
---|
244 | /* Check */ |
---|
245 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
---|
246 | |
---|
247 | { const BYTE* const istart = (const BYTE*) cSrc; |
---|
248 | BYTE* const ostart = (BYTE*) dst; |
---|
249 | BYTE* const oend = ostart + dstSize; |
---|
250 | const void* const dtPtr = DTable + 1; |
---|
251 | const HUF_DEltX2* const dt = (const HUF_DEltX2*)dtPtr; |
---|
252 | |
---|
253 | /* Init */ |
---|
254 | BIT_DStream_t bitD1; |
---|
255 | BIT_DStream_t bitD2; |
---|
256 | BIT_DStream_t bitD3; |
---|
257 | BIT_DStream_t bitD4; |
---|
258 | size_t const length1 = MEM_readLE16(istart); |
---|
259 | size_t const length2 = MEM_readLE16(istart+2); |
---|
260 | size_t const length3 = MEM_readLE16(istart+4); |
---|
261 | size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); |
---|
262 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
---|
263 | const BYTE* const istart2 = istart1 + length1; |
---|
264 | const BYTE* const istart3 = istart2 + length2; |
---|
265 | const BYTE* const istart4 = istart3 + length3; |
---|
266 | const size_t segmentSize = (dstSize+3) / 4; |
---|
267 | BYTE* const opStart2 = ostart + segmentSize; |
---|
268 | BYTE* const opStart3 = opStart2 + segmentSize; |
---|
269 | BYTE* const opStart4 = opStart3 + segmentSize; |
---|
270 | BYTE* op1 = ostart; |
---|
271 | BYTE* op2 = opStart2; |
---|
272 | BYTE* op3 = opStart3; |
---|
273 | BYTE* op4 = opStart4; |
---|
274 | U32 endSignal; |
---|
275 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
276 | U32 const dtLog = dtd.tableLog; |
---|
277 | |
---|
278 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
---|
279 | { size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1); |
---|
280 | if (HUF_isError(errorCode)) return errorCode; } |
---|
281 | { size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2); |
---|
282 | if (HUF_isError(errorCode)) return errorCode; } |
---|
283 | { size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3); |
---|
284 | if (HUF_isError(errorCode)) return errorCode; } |
---|
285 | { size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4); |
---|
286 | if (HUF_isError(errorCode)) return errorCode; } |
---|
287 | |
---|
288 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
---|
289 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
---|
290 | for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) { |
---|
291 | HUF_DECODE_SYMBOLX2_2(op1, &bitD1); |
---|
292 | HUF_DECODE_SYMBOLX2_2(op2, &bitD2); |
---|
293 | HUF_DECODE_SYMBOLX2_2(op3, &bitD3); |
---|
294 | HUF_DECODE_SYMBOLX2_2(op4, &bitD4); |
---|
295 | HUF_DECODE_SYMBOLX2_1(op1, &bitD1); |
---|
296 | HUF_DECODE_SYMBOLX2_1(op2, &bitD2); |
---|
297 | HUF_DECODE_SYMBOLX2_1(op3, &bitD3); |
---|
298 | HUF_DECODE_SYMBOLX2_1(op4, &bitD4); |
---|
299 | HUF_DECODE_SYMBOLX2_2(op1, &bitD1); |
---|
300 | HUF_DECODE_SYMBOLX2_2(op2, &bitD2); |
---|
301 | HUF_DECODE_SYMBOLX2_2(op3, &bitD3); |
---|
302 | HUF_DECODE_SYMBOLX2_2(op4, &bitD4); |
---|
303 | HUF_DECODE_SYMBOLX2_0(op1, &bitD1); |
---|
304 | HUF_DECODE_SYMBOLX2_0(op2, &bitD2); |
---|
305 | HUF_DECODE_SYMBOLX2_0(op3, &bitD3); |
---|
306 | HUF_DECODE_SYMBOLX2_0(op4, &bitD4); |
---|
307 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
---|
308 | } |
---|
309 | |
---|
310 | /* check corruption */ |
---|
311 | if (op1 > opStart2) return ERROR(corruption_detected); |
---|
312 | if (op2 > opStart3) return ERROR(corruption_detected); |
---|
313 | if (op3 > opStart4) return ERROR(corruption_detected); |
---|
314 | /* note : op4 supposed already verified within main loop */ |
---|
315 | |
---|
316 | /* finish bitStreams one by one */ |
---|
317 | HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); |
---|
318 | HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); |
---|
319 | HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); |
---|
320 | HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); |
---|
321 | |
---|
322 | /* check */ |
---|
323 | endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); |
---|
324 | if (!endSignal) return ERROR(corruption_detected); |
---|
325 | |
---|
326 | /* decoded size */ |
---|
327 | return dstSize; |
---|
328 | } |
---|
329 | } |
---|
330 | |
---|
331 | |
---|
332 | size_t HUF_decompress4X2_usingDTable( |
---|
333 | void* dst, size_t dstSize, |
---|
334 | const void* cSrc, size_t cSrcSize, |
---|
335 | const HUF_DTable* DTable) |
---|
336 | { |
---|
337 | DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
338 | if (dtd.tableType != 0) return ERROR(GENERIC); |
---|
339 | return HUF_decompress4X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
---|
340 | } |
---|
341 | |
---|
342 | |
---|
343 | size_t HUF_decompress4X2_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
344 | { |
---|
345 | const BYTE* ip = (const BYTE*) cSrc; |
---|
346 | |
---|
347 | size_t const hSize = HUF_readDTableX2 (dctx, cSrc, cSrcSize); |
---|
348 | if (HUF_isError(hSize)) return hSize; |
---|
349 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
---|
350 | ip += hSize; cSrcSize -= hSize; |
---|
351 | |
---|
352 | return HUF_decompress4X2_usingDTable_internal (dst, dstSize, ip, cSrcSize, dctx); |
---|
353 | } |
---|
354 | |
---|
355 | size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
356 | { |
---|
357 | HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_TABLELOG_MAX); |
---|
358 | return HUF_decompress4X2_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
---|
359 | } |
---|
360 | |
---|
361 | |
---|
362 | /* *************************/ |
---|
363 | /* double-symbols decoding */ |
---|
364 | /* *************************/ |
---|
365 | typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */ |
---|
366 | |
---|
367 | typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; |
---|
368 | |
---|
369 | static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed, |
---|
370 | const U32* rankValOrigin, const int minWeight, |
---|
371 | const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, |
---|
372 | U32 nbBitsBaseline, U16 baseSeq) |
---|
373 | { |
---|
374 | HUF_DEltX4 DElt; |
---|
375 | U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; |
---|
376 | |
---|
377 | /* get pre-calculated rankVal */ |
---|
378 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
---|
379 | |
---|
380 | /* fill skipped values */ |
---|
381 | if (minWeight>1) { |
---|
382 | U32 i, skipSize = rankVal[minWeight]; |
---|
383 | MEM_writeLE16(&(DElt.sequence), baseSeq); |
---|
384 | DElt.nbBits = (BYTE)(consumed); |
---|
385 | DElt.length = 1; |
---|
386 | for (i = 0; i < skipSize; i++) |
---|
387 | DTable[i] = DElt; |
---|
388 | } |
---|
389 | |
---|
390 | /* fill DTable */ |
---|
391 | { U32 s; for (s=0; s<sortedListSize; s++) { /* note : sortedSymbols already skipped */ |
---|
392 | const U32 symbol = sortedSymbols[s].symbol; |
---|
393 | const U32 weight = sortedSymbols[s].weight; |
---|
394 | const U32 nbBits = nbBitsBaseline - weight; |
---|
395 | const U32 length = 1 << (sizeLog-nbBits); |
---|
396 | const U32 start = rankVal[weight]; |
---|
397 | U32 i = start; |
---|
398 | const U32 end = start + length; |
---|
399 | |
---|
400 | MEM_writeLE16(&(DElt.sequence), (U16)(baseSeq + (symbol << 8))); |
---|
401 | DElt.nbBits = (BYTE)(nbBits + consumed); |
---|
402 | DElt.length = 2; |
---|
403 | do { DTable[i++] = DElt; } while (i<end); /* since length >= 1 */ |
---|
404 | |
---|
405 | rankVal[weight] += length; |
---|
406 | }} |
---|
407 | } |
---|
408 | |
---|
409 | typedef U32 rankVal_t[HUF_TABLELOG_ABSOLUTEMAX][HUF_TABLELOG_ABSOLUTEMAX + 1]; |
---|
410 | |
---|
411 | static void HUF_fillDTableX4(HUF_DEltX4* DTable, const U32 targetLog, |
---|
412 | const sortedSymbol_t* sortedList, const U32 sortedListSize, |
---|
413 | const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, |
---|
414 | const U32 nbBitsBaseline) |
---|
415 | { |
---|
416 | U32 rankVal[HUF_TABLELOG_ABSOLUTEMAX + 1]; |
---|
417 | const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ |
---|
418 | const U32 minBits = nbBitsBaseline - maxWeight; |
---|
419 | U32 s; |
---|
420 | |
---|
421 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
---|
422 | |
---|
423 | /* fill DTable */ |
---|
424 | for (s=0; s<sortedListSize; s++) { |
---|
425 | const U16 symbol = sortedList[s].symbol; |
---|
426 | const U32 weight = sortedList[s].weight; |
---|
427 | const U32 nbBits = nbBitsBaseline - weight; |
---|
428 | const U32 start = rankVal[weight]; |
---|
429 | const U32 length = 1 << (targetLog-nbBits); |
---|
430 | |
---|
431 | if (targetLog-nbBits >= minBits) { /* enough room for a second symbol */ |
---|
432 | U32 sortedRank; |
---|
433 | int minWeight = nbBits + scaleLog; |
---|
434 | if (minWeight < 1) minWeight = 1; |
---|
435 | sortedRank = rankStart[minWeight]; |
---|
436 | HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, |
---|
437 | rankValOrigin[nbBits], minWeight, |
---|
438 | sortedList+sortedRank, sortedListSize-sortedRank, |
---|
439 | nbBitsBaseline, symbol); |
---|
440 | } else { |
---|
441 | HUF_DEltX4 DElt; |
---|
442 | MEM_writeLE16(&(DElt.sequence), symbol); |
---|
443 | DElt.nbBits = (BYTE)(nbBits); |
---|
444 | DElt.length = 1; |
---|
445 | { U32 u; |
---|
446 | const U32 end = start + length; |
---|
447 | for (u = start; u < end; u++) DTable[u] = DElt; |
---|
448 | } } |
---|
449 | rankVal[weight] += length; |
---|
450 | } |
---|
451 | } |
---|
452 | |
---|
453 | size_t HUF_readDTableX4 (HUF_DTable* DTable, const void* src, size_t srcSize) |
---|
454 | { |
---|
455 | BYTE weightList[HUF_SYMBOLVALUE_MAX + 1]; |
---|
456 | sortedSymbol_t sortedSymbol[HUF_SYMBOLVALUE_MAX + 1]; |
---|
457 | U32 rankStats[HUF_TABLELOG_ABSOLUTEMAX + 1] = { 0 }; |
---|
458 | U32 rankStart0[HUF_TABLELOG_ABSOLUTEMAX + 2] = { 0 }; |
---|
459 | U32* const rankStart = rankStart0+1; |
---|
460 | rankVal_t rankVal; |
---|
461 | U32 tableLog, maxW, sizeOfSort, nbSymbols; |
---|
462 | DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
463 | U32 const maxTableLog = dtd.maxTableLog; |
---|
464 | size_t iSize; |
---|
465 | void* dtPtr = DTable+1; /* force compiler to avoid strict-aliasing */ |
---|
466 | HUF_DEltX4* const dt = (HUF_DEltX4*)dtPtr; |
---|
467 | |
---|
468 | HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(HUF_DTable)); /* if compilation fails here, assertion is false */ |
---|
469 | if (maxTableLog > HUF_TABLELOG_ABSOLUTEMAX) return ERROR(tableLog_tooLarge); |
---|
470 | //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */ |
---|
471 | |
---|
472 | iSize = HUF_readStats(weightList, HUF_SYMBOLVALUE_MAX + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); |
---|
473 | if (HUF_isError(iSize)) return iSize; |
---|
474 | |
---|
475 | /* check result */ |
---|
476 | if (tableLog > maxTableLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ |
---|
477 | |
---|
478 | /* find maxWeight */ |
---|
479 | for (maxW = tableLog; rankStats[maxW]==0; maxW--) {} /* necessarily finds a solution before 0 */ |
---|
480 | |
---|
481 | /* Get start index of each weight */ |
---|
482 | { U32 w, nextRankStart = 0; |
---|
483 | for (w=1; w<maxW+1; w++) { |
---|
484 | U32 current = nextRankStart; |
---|
485 | nextRankStart += rankStats[w]; |
---|
486 | rankStart[w] = current; |
---|
487 | } |
---|
488 | rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ |
---|
489 | sizeOfSort = nextRankStart; |
---|
490 | } |
---|
491 | |
---|
492 | /* sort symbols by weight */ |
---|
493 | { U32 s; |
---|
494 | for (s=0; s<nbSymbols; s++) { |
---|
495 | U32 const w = weightList[s]; |
---|
496 | U32 const r = rankStart[w]++; |
---|
497 | sortedSymbol[r].symbol = (BYTE)s; |
---|
498 | sortedSymbol[r].weight = (BYTE)w; |
---|
499 | } |
---|
500 | rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */ |
---|
501 | } |
---|
502 | |
---|
503 | /* Build rankVal */ |
---|
504 | { U32* const rankVal0 = rankVal[0]; |
---|
505 | { int const rescale = (maxTableLog-tableLog) - 1; /* tableLog <= maxTableLog */ |
---|
506 | U32 nextRankVal = 0; |
---|
507 | U32 w; |
---|
508 | for (w=1; w<maxW+1; w++) { |
---|
509 | U32 current = nextRankVal; |
---|
510 | nextRankVal += rankStats[w] << (w+rescale); |
---|
511 | rankVal0[w] = current; |
---|
512 | } } |
---|
513 | { U32 const minBits = tableLog+1 - maxW; |
---|
514 | U32 consumed; |
---|
515 | for (consumed = minBits; consumed < maxTableLog - minBits + 1; consumed++) { |
---|
516 | U32* const rankValPtr = rankVal[consumed]; |
---|
517 | U32 w; |
---|
518 | for (w = 1; w < maxW+1; w++) { |
---|
519 | rankValPtr[w] = rankVal0[w] >> consumed; |
---|
520 | } } } } |
---|
521 | |
---|
522 | HUF_fillDTableX4(dt, maxTableLog, |
---|
523 | sortedSymbol, sizeOfSort, |
---|
524 | rankStart0, rankVal, maxW, |
---|
525 | tableLog+1); |
---|
526 | |
---|
527 | dtd.tableLog = (BYTE)maxTableLog; |
---|
528 | dtd.tableType = 1; |
---|
529 | memcpy(DTable, &dtd, sizeof(dtd)); |
---|
530 | return iSize; |
---|
531 | } |
---|
532 | |
---|
533 | |
---|
534 | static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) |
---|
535 | { |
---|
536 | const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
---|
537 | memcpy(op, dt+val, 2); |
---|
538 | BIT_skipBits(DStream, dt[val].nbBits); |
---|
539 | return dt[val].length; |
---|
540 | } |
---|
541 | |
---|
542 | static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) |
---|
543 | { |
---|
544 | const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
---|
545 | memcpy(op, dt+val, 1); |
---|
546 | if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits); |
---|
547 | else { |
---|
548 | if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) { |
---|
549 | BIT_skipBits(DStream, dt[val].nbBits); |
---|
550 | if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) |
---|
551 | DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ |
---|
552 | } } |
---|
553 | return 1; |
---|
554 | } |
---|
555 | |
---|
556 | |
---|
557 | #define HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ |
---|
558 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
---|
559 | |
---|
560 | #define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ |
---|
561 | if (MEM_64bits() || (HUF_TABLELOG_MAX<=12)) \ |
---|
562 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
---|
563 | |
---|
564 | #define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ |
---|
565 | if (MEM_64bits()) \ |
---|
566 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
---|
567 | |
---|
568 | static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog) |
---|
569 | { |
---|
570 | BYTE* const pStart = p; |
---|
571 | |
---|
572 | /* up to 8 symbols at a time */ |
---|
573 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7)) { |
---|
574 | HUF_DECODE_SYMBOLX4_2(p, bitDPtr); |
---|
575 | HUF_DECODE_SYMBOLX4_1(p, bitDPtr); |
---|
576 | HUF_DECODE_SYMBOLX4_2(p, bitDPtr); |
---|
577 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); |
---|
578 | } |
---|
579 | |
---|
580 | /* closer to end : up to 2 symbols at a time */ |
---|
581 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2)) |
---|
582 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); |
---|
583 | |
---|
584 | while (p <= pEnd-2) |
---|
585 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ |
---|
586 | |
---|
587 | if (p < pEnd) |
---|
588 | p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); |
---|
589 | |
---|
590 | return p-pStart; |
---|
591 | } |
---|
592 | |
---|
593 | |
---|
594 | static size_t HUF_decompress1X4_usingDTable_internal( |
---|
595 | void* dst, size_t dstSize, |
---|
596 | const void* cSrc, size_t cSrcSize, |
---|
597 | const HUF_DTable* DTable) |
---|
598 | { |
---|
599 | BIT_DStream_t bitD; |
---|
600 | |
---|
601 | /* Init */ |
---|
602 | { size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); |
---|
603 | if (HUF_isError(errorCode)) return errorCode; |
---|
604 | } |
---|
605 | |
---|
606 | /* decode */ |
---|
607 | { BYTE* const ostart = (BYTE*) dst; |
---|
608 | BYTE* const oend = ostart + dstSize; |
---|
609 | const void* const dtPtr = DTable+1; /* force compiler to not use strict-aliasing */ |
---|
610 | const HUF_DEltX4* const dt = (const HUF_DEltX4*)dtPtr; |
---|
611 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
612 | HUF_decodeStreamX4(ostart, &bitD, oend, dt, dtd.tableLog); |
---|
613 | } |
---|
614 | |
---|
615 | /* check */ |
---|
616 | if (!BIT_endOfDStream(&bitD)) return ERROR(corruption_detected); |
---|
617 | |
---|
618 | /* decoded size */ |
---|
619 | return dstSize; |
---|
620 | } |
---|
621 | |
---|
622 | size_t HUF_decompress1X4_usingDTable( |
---|
623 | void* dst, size_t dstSize, |
---|
624 | const void* cSrc, size_t cSrcSize, |
---|
625 | const HUF_DTable* DTable) |
---|
626 | { |
---|
627 | DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
628 | if (dtd.tableType != 1) return ERROR(GENERIC); |
---|
629 | return HUF_decompress1X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
---|
630 | } |
---|
631 | |
---|
632 | size_t HUF_decompress1X4_DCtx (HUF_DTable* DCtx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
633 | { |
---|
634 | const BYTE* ip = (const BYTE*) cSrc; |
---|
635 | |
---|
636 | size_t const hSize = HUF_readDTableX4 (DCtx, cSrc, cSrcSize); |
---|
637 | if (HUF_isError(hSize)) return hSize; |
---|
638 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
---|
639 | ip += hSize; cSrcSize -= hSize; |
---|
640 | |
---|
641 | return HUF_decompress1X4_usingDTable_internal (dst, dstSize, ip, cSrcSize, DCtx); |
---|
642 | } |
---|
643 | |
---|
644 | size_t HUF_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
645 | { |
---|
646 | HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_TABLELOG_MAX); |
---|
647 | return HUF_decompress1X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
---|
648 | } |
---|
649 | |
---|
650 | static size_t HUF_decompress4X4_usingDTable_internal( |
---|
651 | void* dst, size_t dstSize, |
---|
652 | const void* cSrc, size_t cSrcSize, |
---|
653 | const HUF_DTable* DTable) |
---|
654 | { |
---|
655 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
---|
656 | |
---|
657 | { const BYTE* const istart = (const BYTE*) cSrc; |
---|
658 | BYTE* const ostart = (BYTE*) dst; |
---|
659 | BYTE* const oend = ostart + dstSize; |
---|
660 | const void* const dtPtr = DTable+1; |
---|
661 | const HUF_DEltX4* const dt = (const HUF_DEltX4*)dtPtr; |
---|
662 | |
---|
663 | /* Init */ |
---|
664 | BIT_DStream_t bitD1; |
---|
665 | BIT_DStream_t bitD2; |
---|
666 | BIT_DStream_t bitD3; |
---|
667 | BIT_DStream_t bitD4; |
---|
668 | size_t const length1 = MEM_readLE16(istart); |
---|
669 | size_t const length2 = MEM_readLE16(istart+2); |
---|
670 | size_t const length3 = MEM_readLE16(istart+4); |
---|
671 | size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6); |
---|
672 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
---|
673 | const BYTE* const istart2 = istart1 + length1; |
---|
674 | const BYTE* const istart3 = istart2 + length2; |
---|
675 | const BYTE* const istart4 = istart3 + length3; |
---|
676 | size_t const segmentSize = (dstSize+3) / 4; |
---|
677 | BYTE* const opStart2 = ostart + segmentSize; |
---|
678 | BYTE* const opStart3 = opStart2 + segmentSize; |
---|
679 | BYTE* const opStart4 = opStart3 + segmentSize; |
---|
680 | BYTE* op1 = ostart; |
---|
681 | BYTE* op2 = opStart2; |
---|
682 | BYTE* op3 = opStart3; |
---|
683 | BYTE* op4 = opStart4; |
---|
684 | U32 endSignal; |
---|
685 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
686 | U32 const dtLog = dtd.tableLog; |
---|
687 | |
---|
688 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
---|
689 | { size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1); |
---|
690 | if (HUF_isError(errorCode)) return errorCode; } |
---|
691 | { size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2); |
---|
692 | if (HUF_isError(errorCode)) return errorCode; } |
---|
693 | { size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3); |
---|
694 | if (HUF_isError(errorCode)) return errorCode; } |
---|
695 | { size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4); |
---|
696 | if (HUF_isError(errorCode)) return errorCode; } |
---|
697 | |
---|
698 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
---|
699 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
---|
700 | for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) { |
---|
701 | HUF_DECODE_SYMBOLX4_2(op1, &bitD1); |
---|
702 | HUF_DECODE_SYMBOLX4_2(op2, &bitD2); |
---|
703 | HUF_DECODE_SYMBOLX4_2(op3, &bitD3); |
---|
704 | HUF_DECODE_SYMBOLX4_2(op4, &bitD4); |
---|
705 | HUF_DECODE_SYMBOLX4_1(op1, &bitD1); |
---|
706 | HUF_DECODE_SYMBOLX4_1(op2, &bitD2); |
---|
707 | HUF_DECODE_SYMBOLX4_1(op3, &bitD3); |
---|
708 | HUF_DECODE_SYMBOLX4_1(op4, &bitD4); |
---|
709 | HUF_DECODE_SYMBOLX4_2(op1, &bitD1); |
---|
710 | HUF_DECODE_SYMBOLX4_2(op2, &bitD2); |
---|
711 | HUF_DECODE_SYMBOLX4_2(op3, &bitD3); |
---|
712 | HUF_DECODE_SYMBOLX4_2(op4, &bitD4); |
---|
713 | HUF_DECODE_SYMBOLX4_0(op1, &bitD1); |
---|
714 | HUF_DECODE_SYMBOLX4_0(op2, &bitD2); |
---|
715 | HUF_DECODE_SYMBOLX4_0(op3, &bitD3); |
---|
716 | HUF_DECODE_SYMBOLX4_0(op4, &bitD4); |
---|
717 | |
---|
718 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
---|
719 | } |
---|
720 | |
---|
721 | /* check corruption */ |
---|
722 | if (op1 > opStart2) return ERROR(corruption_detected); |
---|
723 | if (op2 > opStart3) return ERROR(corruption_detected); |
---|
724 | if (op3 > opStart4) return ERROR(corruption_detected); |
---|
725 | /* note : op4 supposed already verified within main loop */ |
---|
726 | |
---|
727 | /* finish bitStreams one by one */ |
---|
728 | HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); |
---|
729 | HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); |
---|
730 | HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); |
---|
731 | HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); |
---|
732 | |
---|
733 | /* check */ |
---|
734 | { U32 const endCheck = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); |
---|
735 | if (!endCheck) return ERROR(corruption_detected); } |
---|
736 | |
---|
737 | /* decoded size */ |
---|
738 | return dstSize; |
---|
739 | } |
---|
740 | } |
---|
741 | |
---|
742 | |
---|
743 | size_t HUF_decompress4X4_usingDTable( |
---|
744 | void* dst, size_t dstSize, |
---|
745 | const void* cSrc, size_t cSrcSize, |
---|
746 | const HUF_DTable* DTable) |
---|
747 | { |
---|
748 | DTableDesc dtd = HUF_getDTableDesc(DTable); |
---|
749 | if (dtd.tableType != 1) return ERROR(GENERIC); |
---|
750 | return HUF_decompress4X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable); |
---|
751 | } |
---|
752 | |
---|
753 | |
---|
754 | size_t HUF_decompress4X4_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
755 | { |
---|
756 | const BYTE* ip = (const BYTE*) cSrc; |
---|
757 | |
---|
758 | size_t hSize = HUF_readDTableX4 (dctx, cSrc, cSrcSize); |
---|
759 | if (HUF_isError(hSize)) return hSize; |
---|
760 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
---|
761 | ip += hSize; cSrcSize -= hSize; |
---|
762 | |
---|
763 | return HUF_decompress4X4_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx); |
---|
764 | } |
---|
765 | |
---|
766 | size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
767 | { |
---|
768 | HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_TABLELOG_MAX); |
---|
769 | return HUF_decompress4X4_DCtx(DTable, dst, dstSize, cSrc, cSrcSize); |
---|
770 | } |
---|
771 | |
---|
772 | |
---|
773 | /* ********************************/ |
---|
774 | /* Generic decompression selector */ |
---|
775 | /* ********************************/ |
---|
776 | |
---|
777 | size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, |
---|
778 | const void* cSrc, size_t cSrcSize, |
---|
779 | const HUF_DTable* DTable) |
---|
780 | { |
---|
781 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
782 | return dtd.tableType ? HUF_decompress1X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : |
---|
783 | HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); |
---|
784 | } |
---|
785 | |
---|
786 | size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, |
---|
787 | const void* cSrc, size_t cSrcSize, |
---|
788 | const HUF_DTable* DTable) |
---|
789 | { |
---|
790 | DTableDesc const dtd = HUF_getDTableDesc(DTable); |
---|
791 | return dtd.tableType ? HUF_decompress4X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable) : |
---|
792 | HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable); |
---|
793 | } |
---|
794 | |
---|
795 | |
---|
796 | typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; |
---|
797 | static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = |
---|
798 | { |
---|
799 | /* single, double, quad */ |
---|
800 | {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ |
---|
801 | {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ |
---|
802 | {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ |
---|
803 | {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ |
---|
804 | {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ |
---|
805 | {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ |
---|
806 | {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ |
---|
807 | {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ |
---|
808 | {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ |
---|
809 | {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ |
---|
810 | {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ |
---|
811 | {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ |
---|
812 | {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ |
---|
813 | {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ |
---|
814 | {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ |
---|
815 | {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ |
---|
816 | }; |
---|
817 | |
---|
818 | /** HUF_selectDecoder() : |
---|
819 | * Tells which decoder is likely to decode faster, |
---|
820 | * based on a set of pre-determined metrics. |
---|
821 | * @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 . |
---|
822 | * Assumption : 0 < cSrcSize < dstSize <= 128 KB */ |
---|
823 | U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize) |
---|
824 | { |
---|
825 | /* decoder timing evaluation */ |
---|
826 | U32 const Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */ |
---|
827 | U32 const D256 = (U32)(dstSize >> 8); |
---|
828 | U32 const DTime0 = algoTime[Q][0].tableTime + (algoTime[Q][0].decode256Time * D256); |
---|
829 | U32 DTime1 = algoTime[Q][1].tableTime + (algoTime[Q][1].decode256Time * D256); |
---|
830 | DTime1 += DTime1 >> 3; /* advantage to algorithm using less memory, for cache eviction */ |
---|
831 | |
---|
832 | return DTime1 < DTime0; |
---|
833 | } |
---|
834 | |
---|
835 | |
---|
836 | typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); |
---|
837 | |
---|
838 | size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
839 | { |
---|
840 | static const decompressionAlgo decompress[2] = { HUF_decompress4X2, HUF_decompress4X4 }; |
---|
841 | |
---|
842 | /* validation checks */ |
---|
843 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
---|
844 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
---|
845 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
---|
846 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
---|
847 | |
---|
848 | { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); |
---|
849 | return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); |
---|
850 | } |
---|
851 | |
---|
852 | //return HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */ |
---|
853 | //return HUF_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */ |
---|
854 | } |
---|
855 | |
---|
856 | size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
857 | { |
---|
858 | /* validation checks */ |
---|
859 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
---|
860 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
---|
861 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
---|
862 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
---|
863 | |
---|
864 | { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); |
---|
865 | return algoNb ? HUF_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
---|
866 | HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
---|
867 | } |
---|
868 | } |
---|
869 | |
---|
870 | size_t HUF_decompress4X_hufOnly (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
871 | { |
---|
872 | /* validation checks */ |
---|
873 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
---|
874 | if ((cSrcSize >= dstSize) || (cSrcSize <= 1)) return ERROR(corruption_detected); /* invalid */ |
---|
875 | |
---|
876 | { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); |
---|
877 | return algoNb ? HUF_decompress4X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
---|
878 | HUF_decompress4X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
---|
879 | } |
---|
880 | } |
---|
881 | |
---|
882 | size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
---|
883 | { |
---|
884 | /* validation checks */ |
---|
885 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
---|
886 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
---|
887 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
---|
888 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
---|
889 | |
---|
890 | { U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize); |
---|
891 | return algoNb ? HUF_decompress1X4_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) : |
---|
892 | HUF_decompress1X2_DCtx(dctx, dst, dstSize, cSrc, cSrcSize) ; |
---|
893 | } |
---|
894 | } |
---|