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Commit | Line | Data |
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30fdf114 | 1 | /* LzmaDec.c -- LZMA Decoder\r |
c4ab09ef LG |
2 | 2016-05-16 : Igor Pavlov : Public domain */\r |
3 | \r | |
4 | #include "Precomp.h"\r | |
30fdf114 LG |
5 | \r |
6 | #include "LzmaDec.h"\r | |
7 | \r | |
8 | #include <string.h>\r | |
9 | \r | |
10 | #define kNumTopBits 24\r | |
11 | #define kTopValue ((UInt32)1 << kNumTopBits)\r | |
12 | \r | |
13 | #define kNumBitModelTotalBits 11\r | |
14 | #define kBitModelTotal (1 << kNumBitModelTotalBits)\r | |
15 | #define kNumMoveBits 5\r | |
16 | \r | |
17 | #define RC_INIT_SIZE 5\r | |
18 | \r | |
19 | #define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }\r | |
20 | \r | |
21 | #define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)\r | |
22 | #define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));\r | |
23 | #define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));\r | |
24 | #define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \\r | |
25 | { UPDATE_0(p); i = (i + i); A0; } else \\r | |
26 | { UPDATE_1(p); i = (i + i) + 1; A1; }\r | |
27 | #define GET_BIT(p, i) GET_BIT2(p, i, ; , ;)\r | |
28 | \r | |
29 | #define TREE_GET_BIT(probs, i) { GET_BIT((probs + i), i); }\r | |
30 | #define TREE_DECODE(probs, limit, i) \\r | |
31 | { i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }\r | |
32 | \r | |
33 | /* #define _LZMA_SIZE_OPT */\r | |
34 | \r | |
35 | #ifdef _LZMA_SIZE_OPT\r | |
36 | #define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i)\r | |
37 | #else\r | |
38 | #define TREE_6_DECODE(probs, i) \\r | |
39 | { i = 1; \\r | |
40 | TREE_GET_BIT(probs, i); \\r | |
41 | TREE_GET_BIT(probs, i); \\r | |
42 | TREE_GET_BIT(probs, i); \\r | |
43 | TREE_GET_BIT(probs, i); \\r | |
44 | TREE_GET_BIT(probs, i); \\r | |
45 | TREE_GET_BIT(probs, i); \\r | |
46 | i -= 0x40; }\r | |
47 | #endif\r | |
48 | \r | |
c4ab09ef LG |
49 | #define NORMAL_LITER_DEC GET_BIT(prob + symbol, symbol)\r |
50 | #define MATCHED_LITER_DEC \\r | |
51 | matchByte <<= 1; \\r | |
52 | bit = (matchByte & offs); \\r | |
53 | probLit = prob + offs + bit + symbol; \\r | |
54 | GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit)\r | |
55 | \r | |
30fdf114 LG |
56 | #define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_ERROR; range <<= 8; code = (code << 8) | (*buf++); }\r |
57 | \r | |
58 | #define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)\r | |
59 | #define UPDATE_0_CHECK range = bound;\r | |
60 | #define UPDATE_1_CHECK range -= bound; code -= bound;\r | |
61 | #define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \\r | |
62 | { UPDATE_0_CHECK; i = (i + i); A0; } else \\r | |
63 | { UPDATE_1_CHECK; i = (i + i) + 1; A1; }\r | |
64 | #define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;)\r | |
65 | #define TREE_DECODE_CHECK(probs, limit, i) \\r | |
66 | { i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; }\r | |
67 | \r | |
68 | \r | |
69 | #define kNumPosBitsMax 4\r | |
70 | #define kNumPosStatesMax (1 << kNumPosBitsMax)\r | |
71 | \r | |
72 | #define kLenNumLowBits 3\r | |
73 | #define kLenNumLowSymbols (1 << kLenNumLowBits)\r | |
74 | #define kLenNumMidBits 3\r | |
75 | #define kLenNumMidSymbols (1 << kLenNumMidBits)\r | |
76 | #define kLenNumHighBits 8\r | |
77 | #define kLenNumHighSymbols (1 << kLenNumHighBits)\r | |
78 | \r | |
79 | #define LenChoice 0\r | |
80 | #define LenChoice2 (LenChoice + 1)\r | |
81 | #define LenLow (LenChoice2 + 1)\r | |
82 | #define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))\r | |
83 | #define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))\r | |
84 | #define kNumLenProbs (LenHigh + kLenNumHighSymbols)\r | |
85 | \r | |
86 | \r | |
87 | #define kNumStates 12\r | |
88 | #define kNumLitStates 7\r | |
89 | \r | |
90 | #define kStartPosModelIndex 4\r | |
91 | #define kEndPosModelIndex 14\r | |
92 | #define kNumFullDistances (1 << (kEndPosModelIndex >> 1))\r | |
93 | \r | |
94 | #define kNumPosSlotBits 6\r | |
95 | #define kNumLenToPosStates 4\r | |
96 | \r | |
97 | #define kNumAlignBits 4\r | |
98 | #define kAlignTableSize (1 << kNumAlignBits)\r | |
99 | \r | |
100 | #define kMatchMinLen 2\r | |
101 | #define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols + kLenNumMidSymbols + kLenNumHighSymbols)\r | |
102 | \r | |
103 | #define IsMatch 0\r | |
104 | #define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))\r | |
105 | #define IsRepG0 (IsRep + kNumStates)\r | |
106 | #define IsRepG1 (IsRepG0 + kNumStates)\r | |
107 | #define IsRepG2 (IsRepG1 + kNumStates)\r | |
108 | #define IsRep0Long (IsRepG2 + kNumStates)\r | |
109 | #define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))\r | |
110 | #define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))\r | |
111 | #define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)\r | |
112 | #define LenCoder (Align + kAlignTableSize)\r | |
113 | #define RepLenCoder (LenCoder + kNumLenProbs)\r | |
114 | #define Literal (RepLenCoder + kNumLenProbs)\r | |
115 | \r | |
116 | #define LZMA_BASE_SIZE 1846\r | |
c4ab09ef | 117 | #define LZMA_LIT_SIZE 0x300\r |
30fdf114 LG |
118 | \r |
119 | #if Literal != LZMA_BASE_SIZE\r | |
120 | StopCompilingDueBUG\r | |
121 | #endif\r | |
122 | \r | |
c4ab09ef | 123 | #define LzmaProps_GetNumProbs(p) (Literal + ((UInt32)LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))\r |
30fdf114 LG |
124 | \r |
125 | #define LZMA_DIC_MIN (1 << 12)\r | |
126 | \r | |
127 | /* First LZMA-symbol is always decoded.\r | |
128 | And it decodes new LZMA-symbols while (buf < bufLimit), but "buf" is without last normalization\r | |
129 | Out:\r | |
130 | Result:\r | |
131 | SZ_OK - OK\r | |
132 | SZ_ERROR_DATA - Error\r | |
133 | p->remainLen:\r | |
134 | < kMatchSpecLenStart : normal remain\r | |
135 | = kMatchSpecLenStart : finished\r | |
c4ab09ef LG |
136 | = kMatchSpecLenStart + 1 : Flush marker (unused now)\r |
137 | = kMatchSpecLenStart + 2 : State Init Marker (unused now)\r | |
30fdf114 LG |
138 | */\r |
139 | \r | |
140 | static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte *bufLimit)\r | |
141 | {\r | |
142 | CLzmaProb *probs = p->probs;\r | |
143 | \r | |
144 | unsigned state = p->state;\r | |
145 | UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];\r | |
146 | unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1;\r | |
147 | unsigned lpMask = ((unsigned)1 << (p->prop.lp)) - 1;\r | |
148 | unsigned lc = p->prop.lc;\r | |
149 | \r | |
150 | Byte *dic = p->dic;\r | |
151 | SizeT dicBufSize = p->dicBufSize;\r | |
152 | SizeT dicPos = p->dicPos;\r | |
153 | \r | |
154 | UInt32 processedPos = p->processedPos;\r | |
155 | UInt32 checkDicSize = p->checkDicSize;\r | |
156 | unsigned len = 0;\r | |
157 | \r | |
158 | const Byte *buf = p->buf;\r | |
159 | UInt32 range = p->range;\r | |
160 | UInt32 code = p->code;\r | |
161 | \r | |
162 | do\r | |
163 | {\r | |
164 | CLzmaProb *prob;\r | |
165 | UInt32 bound;\r | |
166 | unsigned ttt;\r | |
167 | unsigned posState = processedPos & pbMask;\r | |
168 | \r | |
169 | prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;\r | |
170 | IF_BIT_0(prob)\r | |
171 | {\r | |
172 | unsigned symbol;\r | |
173 | UPDATE_0(prob);\r | |
174 | prob = probs + Literal;\r | |
c4ab09ef LG |
175 | if (processedPos != 0 || checkDicSize != 0)\r |
176 | prob += ((UInt32)LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) +\r | |
177 | (dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc))));\r | |
178 | processedPos++;\r | |
30fdf114 LG |
179 | \r |
180 | if (state < kNumLitStates)\r | |
181 | {\r | |
c4ab09ef | 182 | state -= (state < 4) ? state : 3;\r |
30fdf114 | 183 | symbol = 1;\r |
c4ab09ef LG |
184 | #ifdef _LZMA_SIZE_OPT\r |
185 | do { NORMAL_LITER_DEC } while (symbol < 0x100);\r | |
186 | #else\r | |
187 | NORMAL_LITER_DEC\r | |
188 | NORMAL_LITER_DEC\r | |
189 | NORMAL_LITER_DEC\r | |
190 | NORMAL_LITER_DEC\r | |
191 | NORMAL_LITER_DEC\r | |
192 | NORMAL_LITER_DEC\r | |
193 | NORMAL_LITER_DEC\r | |
194 | NORMAL_LITER_DEC\r | |
195 | #endif\r | |
30fdf114 LG |
196 | }\r |
197 | else\r | |
198 | {\r | |
c4ab09ef | 199 | unsigned matchByte = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r |
30fdf114 | 200 | unsigned offs = 0x100;\r |
c4ab09ef | 201 | state -= (state < 10) ? 3 : 6;\r |
30fdf114 | 202 | symbol = 1;\r |
c4ab09ef | 203 | #ifdef _LZMA_SIZE_OPT\r |
30fdf114 LG |
204 | do\r |
205 | {\r | |
206 | unsigned bit;\r | |
207 | CLzmaProb *probLit;\r | |
c4ab09ef | 208 | MATCHED_LITER_DEC\r |
30fdf114 LG |
209 | }\r |
210 | while (symbol < 0x100);\r | |
c4ab09ef LG |
211 | #else\r |
212 | {\r | |
213 | unsigned bit;\r | |
214 | CLzmaProb *probLit;\r | |
215 | MATCHED_LITER_DEC\r | |
216 | MATCHED_LITER_DEC\r | |
217 | MATCHED_LITER_DEC\r | |
218 | MATCHED_LITER_DEC\r | |
219 | MATCHED_LITER_DEC\r | |
220 | MATCHED_LITER_DEC\r | |
221 | MATCHED_LITER_DEC\r | |
222 | MATCHED_LITER_DEC\r | |
223 | }\r | |
224 | #endif\r | |
30fdf114 | 225 | }\r |
30fdf114 | 226 | \r |
c4ab09ef | 227 | dic[dicPos++] = (Byte)symbol;\r |
30fdf114 LG |
228 | continue;\r |
229 | }\r | |
c4ab09ef | 230 | \r |
30fdf114 LG |
231 | {\r |
232 | UPDATE_1(prob);\r | |
233 | prob = probs + IsRep + state;\r | |
234 | IF_BIT_0(prob)\r | |
235 | {\r | |
236 | UPDATE_0(prob);\r | |
237 | state += kNumStates;\r | |
238 | prob = probs + LenCoder;\r | |
239 | }\r | |
240 | else\r | |
241 | {\r | |
242 | UPDATE_1(prob);\r | |
243 | if (checkDicSize == 0 && processedPos == 0)\r | |
244 | return SZ_ERROR_DATA;\r | |
245 | prob = probs + IsRepG0 + state;\r | |
246 | IF_BIT_0(prob)\r | |
247 | {\r | |
248 | UPDATE_0(prob);\r | |
249 | prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;\r | |
250 | IF_BIT_0(prob)\r | |
251 | {\r | |
252 | UPDATE_0(prob);\r | |
c4ab09ef | 253 | dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r |
30fdf114 LG |
254 | dicPos++;\r |
255 | processedPos++;\r | |
256 | state = state < kNumLitStates ? 9 : 11;\r | |
257 | continue;\r | |
258 | }\r | |
259 | UPDATE_1(prob);\r | |
260 | }\r | |
261 | else\r | |
262 | {\r | |
263 | UInt32 distance;\r | |
264 | UPDATE_1(prob);\r | |
265 | prob = probs + IsRepG1 + state;\r | |
266 | IF_BIT_0(prob)\r | |
267 | {\r | |
268 | UPDATE_0(prob);\r | |
269 | distance = rep1;\r | |
270 | }\r | |
271 | else\r | |
272 | {\r | |
273 | UPDATE_1(prob);\r | |
274 | prob = probs + IsRepG2 + state;\r | |
275 | IF_BIT_0(prob)\r | |
276 | {\r | |
277 | UPDATE_0(prob);\r | |
278 | distance = rep2;\r | |
279 | }\r | |
280 | else\r | |
281 | {\r | |
282 | UPDATE_1(prob);\r | |
283 | distance = rep3;\r | |
284 | rep3 = rep2;\r | |
285 | }\r | |
286 | rep2 = rep1;\r | |
287 | }\r | |
288 | rep1 = rep0;\r | |
289 | rep0 = distance;\r | |
290 | }\r | |
291 | state = state < kNumLitStates ? 8 : 11;\r | |
292 | prob = probs + RepLenCoder;\r | |
293 | }\r | |
c4ab09ef LG |
294 | \r |
295 | #ifdef _LZMA_SIZE_OPT\r | |
30fdf114 | 296 | {\r |
c4ab09ef | 297 | unsigned lim, offset;\r |
30fdf114 LG |
298 | CLzmaProb *probLen = prob + LenChoice;\r |
299 | IF_BIT_0(probLen)\r | |
300 | {\r | |
301 | UPDATE_0(probLen);\r | |
302 | probLen = prob + LenLow + (posState << kLenNumLowBits);\r | |
303 | offset = 0;\r | |
c4ab09ef | 304 | lim = (1 << kLenNumLowBits);\r |
30fdf114 LG |
305 | }\r |
306 | else\r | |
307 | {\r | |
308 | UPDATE_1(probLen);\r | |
309 | probLen = prob + LenChoice2;\r | |
310 | IF_BIT_0(probLen)\r | |
311 | {\r | |
312 | UPDATE_0(probLen);\r | |
313 | probLen = prob + LenMid + (posState << kLenNumMidBits);\r | |
314 | offset = kLenNumLowSymbols;\r | |
c4ab09ef | 315 | lim = (1 << kLenNumMidBits);\r |
30fdf114 LG |
316 | }\r |
317 | else\r | |
318 | {\r | |
319 | UPDATE_1(probLen);\r | |
320 | probLen = prob + LenHigh;\r | |
321 | offset = kLenNumLowSymbols + kLenNumMidSymbols;\r | |
c4ab09ef | 322 | lim = (1 << kLenNumHighBits);\r |
30fdf114 LG |
323 | }\r |
324 | }\r | |
c4ab09ef | 325 | TREE_DECODE(probLen, lim, len);\r |
30fdf114 LG |
326 | len += offset;\r |
327 | }\r | |
c4ab09ef LG |
328 | #else\r |
329 | {\r | |
330 | CLzmaProb *probLen = prob + LenChoice;\r | |
331 | IF_BIT_0(probLen)\r | |
332 | {\r | |
333 | UPDATE_0(probLen);\r | |
334 | probLen = prob + LenLow + (posState << kLenNumLowBits);\r | |
335 | len = 1;\r | |
336 | TREE_GET_BIT(probLen, len);\r | |
337 | TREE_GET_BIT(probLen, len);\r | |
338 | TREE_GET_BIT(probLen, len);\r | |
339 | len -= 8;\r | |
340 | }\r | |
341 | else\r | |
342 | {\r | |
343 | UPDATE_1(probLen);\r | |
344 | probLen = prob + LenChoice2;\r | |
345 | IF_BIT_0(probLen)\r | |
346 | {\r | |
347 | UPDATE_0(probLen);\r | |
348 | probLen = prob + LenMid + (posState << kLenNumMidBits);\r | |
349 | len = 1;\r | |
350 | TREE_GET_BIT(probLen, len);\r | |
351 | TREE_GET_BIT(probLen, len);\r | |
352 | TREE_GET_BIT(probLen, len);\r | |
353 | }\r | |
354 | else\r | |
355 | {\r | |
356 | UPDATE_1(probLen);\r | |
357 | probLen = prob + LenHigh;\r | |
358 | TREE_DECODE(probLen, (1 << kLenNumHighBits), len);\r | |
359 | len += kLenNumLowSymbols + kLenNumMidSymbols;\r | |
360 | }\r | |
361 | }\r | |
362 | }\r | |
363 | #endif\r | |
30fdf114 LG |
364 | \r |
365 | if (state >= kNumStates)\r | |
366 | {\r | |
367 | UInt32 distance;\r | |
368 | prob = probs + PosSlot +\r | |
369 | ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);\r | |
370 | TREE_6_DECODE(prob, distance);\r | |
371 | if (distance >= kStartPosModelIndex)\r | |
372 | {\r | |
373 | unsigned posSlot = (unsigned)distance;\r | |
c4ab09ef | 374 | unsigned numDirectBits = (unsigned)(((distance >> 1) - 1));\r |
30fdf114 LG |
375 | distance = (2 | (distance & 1));\r |
376 | if (posSlot < kEndPosModelIndex)\r | |
377 | {\r | |
378 | distance <<= numDirectBits;\r | |
379 | prob = probs + SpecPos + distance - posSlot - 1;\r | |
380 | {\r | |
381 | UInt32 mask = 1;\r | |
382 | unsigned i = 1;\r | |
383 | do\r | |
384 | {\r | |
385 | GET_BIT2(prob + i, i, ; , distance |= mask);\r | |
386 | mask <<= 1;\r | |
387 | }\r | |
388 | while (--numDirectBits != 0);\r | |
389 | }\r | |
390 | }\r | |
391 | else\r | |
392 | {\r | |
393 | numDirectBits -= kNumAlignBits;\r | |
394 | do\r | |
395 | {\r | |
396 | NORMALIZE\r | |
397 | range >>= 1;\r | |
398 | \r | |
399 | {\r | |
400 | UInt32 t;\r | |
401 | code -= range;\r | |
402 | t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */\r | |
403 | distance = (distance << 1) + (t + 1);\r | |
404 | code += range & t;\r | |
405 | }\r | |
406 | /*\r | |
407 | distance <<= 1;\r | |
408 | if (code >= range)\r | |
409 | {\r | |
410 | code -= range;\r | |
411 | distance |= 1;\r | |
412 | }\r | |
413 | */\r | |
414 | }\r | |
415 | while (--numDirectBits != 0);\r | |
416 | prob = probs + Align;\r | |
417 | distance <<= kNumAlignBits;\r | |
418 | {\r | |
419 | unsigned i = 1;\r | |
420 | GET_BIT2(prob + i, i, ; , distance |= 1);\r | |
421 | GET_BIT2(prob + i, i, ; , distance |= 2);\r | |
422 | GET_BIT2(prob + i, i, ; , distance |= 4);\r | |
423 | GET_BIT2(prob + i, i, ; , distance |= 8);\r | |
424 | }\r | |
425 | if (distance == (UInt32)0xFFFFFFFF)\r | |
426 | {\r | |
427 | len += kMatchSpecLenStart;\r | |
428 | state -= kNumStates;\r | |
429 | break;\r | |
430 | }\r | |
431 | }\r | |
432 | }\r | |
c4ab09ef | 433 | \r |
30fdf114 LG |
434 | rep3 = rep2;\r |
435 | rep2 = rep1;\r | |
436 | rep1 = rep0;\r | |
437 | rep0 = distance + 1;\r | |
438 | if (checkDicSize == 0)\r | |
439 | {\r | |
440 | if (distance >= processedPos)\r | |
c4ab09ef LG |
441 | {\r |
442 | p->dicPos = dicPos;\r | |
30fdf114 | 443 | return SZ_ERROR_DATA;\r |
c4ab09ef | 444 | }\r |
30fdf114 LG |
445 | }\r |
446 | else if (distance >= checkDicSize)\r | |
c4ab09ef LG |
447 | {\r |
448 | p->dicPos = dicPos;\r | |
30fdf114 | 449 | return SZ_ERROR_DATA;\r |
c4ab09ef | 450 | }\r |
30fdf114 | 451 | state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;\r |
30fdf114 LG |
452 | }\r |
453 | \r | |
454 | len += kMatchMinLen;\r | |
455 | \r | |
30fdf114 | 456 | {\r |
c4ab09ef LG |
457 | SizeT rem;\r |
458 | unsigned curLen;\r | |
459 | SizeT pos;\r | |
460 | \r | |
461 | if ((rem = limit - dicPos) == 0)\r | |
462 | {\r | |
463 | p->dicPos = dicPos;\r | |
464 | return SZ_ERROR_DATA;\r | |
465 | }\r | |
466 | \r | |
467 | curLen = ((rem < len) ? (unsigned)rem : len);\r | |
468 | pos = dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0);\r | |
30fdf114 LG |
469 | \r |
470 | processedPos += curLen;\r | |
471 | \r | |
472 | len -= curLen;\r | |
c4ab09ef | 473 | if (curLen <= dicBufSize - pos)\r |
30fdf114 LG |
474 | {\r |
475 | Byte *dest = dic + dicPos;\r | |
476 | ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos;\r | |
477 | const Byte *lim = dest + curLen;\r | |
478 | dicPos += curLen;\r | |
479 | do\r | |
480 | *(dest) = (Byte)*(dest + src);\r | |
481 | while (++dest != lim);\r | |
482 | }\r | |
483 | else\r | |
484 | {\r | |
485 | do\r | |
486 | {\r | |
487 | dic[dicPos++] = dic[pos];\r | |
488 | if (++pos == dicBufSize)\r | |
489 | pos = 0;\r | |
490 | }\r | |
491 | while (--curLen != 0);\r | |
492 | }\r | |
493 | }\r | |
494 | }\r | |
495 | }\r | |
496 | while (dicPos < limit && buf < bufLimit);\r | |
c4ab09ef | 497 | \r |
30fdf114 | 498 | NORMALIZE;\r |
c4ab09ef | 499 | \r |
30fdf114 LG |
500 | p->buf = buf;\r |
501 | p->range = range;\r | |
502 | p->code = code;\r | |
503 | p->remainLen = len;\r | |
504 | p->dicPos = dicPos;\r | |
505 | p->processedPos = processedPos;\r | |
506 | p->reps[0] = rep0;\r | |
507 | p->reps[1] = rep1;\r | |
508 | p->reps[2] = rep2;\r | |
509 | p->reps[3] = rep3;\r | |
510 | p->state = state;\r | |
511 | \r | |
512 | return SZ_OK;\r | |
513 | }\r | |
514 | \r | |
515 | static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit)\r | |
516 | {\r | |
517 | if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart)\r | |
518 | {\r | |
519 | Byte *dic = p->dic;\r | |
520 | SizeT dicPos = p->dicPos;\r | |
521 | SizeT dicBufSize = p->dicBufSize;\r | |
522 | unsigned len = p->remainLen;\r | |
c4ab09ef LG |
523 | SizeT rep0 = p->reps[0]; /* we use SizeT to avoid the BUG of VC14 for AMD64 */\r |
524 | SizeT rem = limit - dicPos;\r | |
525 | if (rem < len)\r | |
526 | len = (unsigned)(rem);\r | |
30fdf114 LG |
527 | \r |
528 | if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)\r | |
529 | p->checkDicSize = p->prop.dicSize;\r | |
530 | \r | |
531 | p->processedPos += len;\r | |
532 | p->remainLen -= len;\r | |
c4ab09ef | 533 | while (len != 0)\r |
30fdf114 | 534 | {\r |
c4ab09ef LG |
535 | len--;\r |
536 | dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r | |
30fdf114 LG |
537 | dicPos++;\r |
538 | }\r | |
539 | p->dicPos = dicPos;\r | |
540 | }\r | |
541 | }\r | |
542 | \r | |
543 | static int MY_FAST_CALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit)\r | |
544 | {\r | |
545 | do\r | |
546 | {\r | |
547 | SizeT limit2 = limit;\r | |
548 | if (p->checkDicSize == 0)\r | |
549 | {\r | |
550 | UInt32 rem = p->prop.dicSize - p->processedPos;\r | |
551 | if (limit - p->dicPos > rem)\r | |
552 | limit2 = p->dicPos + rem;\r | |
553 | }\r | |
c4ab09ef | 554 | \r |
30fdf114 | 555 | RINOK(LzmaDec_DecodeReal(p, limit2, bufLimit));\r |
c4ab09ef LG |
556 | \r |
557 | if (p->checkDicSize == 0 && p->processedPos >= p->prop.dicSize)\r | |
30fdf114 | 558 | p->checkDicSize = p->prop.dicSize;\r |
c4ab09ef | 559 | \r |
30fdf114 LG |
560 | LzmaDec_WriteRem(p, limit);\r |
561 | }\r | |
562 | while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart);\r | |
563 | \r | |
564 | if (p->remainLen > kMatchSpecLenStart)\r | |
30fdf114 | 565 | p->remainLen = kMatchSpecLenStart;\r |
c4ab09ef | 566 | \r |
30fdf114 LG |
567 | return 0;\r |
568 | }\r | |
569 | \r | |
570 | typedef enum\r | |
571 | {\r | |
572 | DUMMY_ERROR, /* unexpected end of input stream */\r | |
573 | DUMMY_LIT,\r | |
574 | DUMMY_MATCH,\r | |
575 | DUMMY_REP\r | |
576 | } ELzmaDummy;\r | |
577 | \r | |
578 | static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, SizeT inSize)\r | |
579 | {\r | |
580 | UInt32 range = p->range;\r | |
581 | UInt32 code = p->code;\r | |
582 | const Byte *bufLimit = buf + inSize;\r | |
c4ab09ef | 583 | const CLzmaProb *probs = p->probs;\r |
30fdf114 LG |
584 | unsigned state = p->state;\r |
585 | ELzmaDummy res;\r | |
586 | \r | |
587 | {\r | |
c4ab09ef | 588 | const CLzmaProb *prob;\r |
30fdf114 LG |
589 | UInt32 bound;\r |
590 | unsigned ttt;\r | |
591 | unsigned posState = (p->processedPos) & ((1 << p->prop.pb) - 1);\r | |
592 | \r | |
593 | prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;\r | |
594 | IF_BIT_0_CHECK(prob)\r | |
595 | {\r | |
596 | UPDATE_0_CHECK\r | |
597 | \r | |
598 | /* if (bufLimit - buf >= 7) return DUMMY_LIT; */\r | |
599 | \r | |
600 | prob = probs + Literal;\r | |
601 | if (p->checkDicSize != 0 || p->processedPos != 0)\r | |
c4ab09ef LG |
602 | prob += ((UInt32)LZMA_LIT_SIZE *\r |
603 | ((((p->processedPos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) +\r | |
604 | (p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc))));\r | |
30fdf114 LG |
605 | \r |
606 | if (state < kNumLitStates)\r | |
607 | {\r | |
608 | unsigned symbol = 1;\r | |
609 | do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);\r | |
610 | }\r | |
611 | else\r | |
612 | {\r | |
613 | unsigned matchByte = p->dic[p->dicPos - p->reps[0] +\r | |
c4ab09ef | 614 | (p->dicPos < p->reps[0] ? p->dicBufSize : 0)];\r |
30fdf114 LG |
615 | unsigned offs = 0x100;\r |
616 | unsigned symbol = 1;\r | |
617 | do\r | |
618 | {\r | |
619 | unsigned bit;\r | |
c4ab09ef | 620 | const CLzmaProb *probLit;\r |
30fdf114 LG |
621 | matchByte <<= 1;\r |
622 | bit = (matchByte & offs);\r | |
623 | probLit = prob + offs + bit + symbol;\r | |
624 | GET_BIT2_CHECK(probLit, symbol, offs &= ~bit, offs &= bit)\r | |
625 | }\r | |
626 | while (symbol < 0x100);\r | |
627 | }\r | |
628 | res = DUMMY_LIT;\r | |
629 | }\r | |
630 | else\r | |
631 | {\r | |
632 | unsigned len;\r | |
633 | UPDATE_1_CHECK;\r | |
634 | \r | |
635 | prob = probs + IsRep + state;\r | |
636 | IF_BIT_0_CHECK(prob)\r | |
637 | {\r | |
638 | UPDATE_0_CHECK;\r | |
639 | state = 0;\r | |
640 | prob = probs + LenCoder;\r | |
641 | res = DUMMY_MATCH;\r | |
642 | }\r | |
643 | else\r | |
644 | {\r | |
645 | UPDATE_1_CHECK;\r | |
646 | res = DUMMY_REP;\r | |
647 | prob = probs + IsRepG0 + state;\r | |
648 | IF_BIT_0_CHECK(prob)\r | |
649 | {\r | |
650 | UPDATE_0_CHECK;\r | |
651 | prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;\r | |
652 | IF_BIT_0_CHECK(prob)\r | |
653 | {\r | |
654 | UPDATE_0_CHECK;\r | |
655 | NORMALIZE_CHECK;\r | |
656 | return DUMMY_REP;\r | |
657 | }\r | |
658 | else\r | |
659 | {\r | |
660 | UPDATE_1_CHECK;\r | |
661 | }\r | |
662 | }\r | |
663 | else\r | |
664 | {\r | |
665 | UPDATE_1_CHECK;\r | |
666 | prob = probs + IsRepG1 + state;\r | |
667 | IF_BIT_0_CHECK(prob)\r | |
668 | {\r | |
669 | UPDATE_0_CHECK;\r | |
670 | }\r | |
671 | else\r | |
672 | {\r | |
673 | UPDATE_1_CHECK;\r | |
674 | prob = probs + IsRepG2 + state;\r | |
675 | IF_BIT_0_CHECK(prob)\r | |
676 | {\r | |
677 | UPDATE_0_CHECK;\r | |
678 | }\r | |
679 | else\r | |
680 | {\r | |
681 | UPDATE_1_CHECK;\r | |
682 | }\r | |
683 | }\r | |
684 | }\r | |
685 | state = kNumStates;\r | |
686 | prob = probs + RepLenCoder;\r | |
687 | }\r | |
688 | {\r | |
689 | unsigned limit, offset;\r | |
c4ab09ef | 690 | const CLzmaProb *probLen = prob + LenChoice;\r |
30fdf114 LG |
691 | IF_BIT_0_CHECK(probLen)\r |
692 | {\r | |
693 | UPDATE_0_CHECK;\r | |
694 | probLen = prob + LenLow + (posState << kLenNumLowBits);\r | |
695 | offset = 0;\r | |
696 | limit = 1 << kLenNumLowBits;\r | |
697 | }\r | |
698 | else\r | |
699 | {\r | |
700 | UPDATE_1_CHECK;\r | |
701 | probLen = prob + LenChoice2;\r | |
702 | IF_BIT_0_CHECK(probLen)\r | |
703 | {\r | |
704 | UPDATE_0_CHECK;\r | |
705 | probLen = prob + LenMid + (posState << kLenNumMidBits);\r | |
706 | offset = kLenNumLowSymbols;\r | |
707 | limit = 1 << kLenNumMidBits;\r | |
708 | }\r | |
709 | else\r | |
710 | {\r | |
711 | UPDATE_1_CHECK;\r | |
712 | probLen = prob + LenHigh;\r | |
713 | offset = kLenNumLowSymbols + kLenNumMidSymbols;\r | |
714 | limit = 1 << kLenNumHighBits;\r | |
715 | }\r | |
716 | }\r | |
717 | TREE_DECODE_CHECK(probLen, limit, len);\r | |
718 | len += offset;\r | |
719 | }\r | |
720 | \r | |
721 | if (state < 4)\r | |
722 | {\r | |
723 | unsigned posSlot;\r | |
724 | prob = probs + PosSlot +\r | |
725 | ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<\r | |
726 | kNumPosSlotBits);\r | |
727 | TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot);\r | |
728 | if (posSlot >= kStartPosModelIndex)\r | |
729 | {\r | |
c4ab09ef | 730 | unsigned numDirectBits = ((posSlot >> 1) - 1);\r |
30fdf114 LG |
731 | \r |
732 | /* if (bufLimit - buf >= 8) return DUMMY_MATCH; */\r | |
733 | \r | |
734 | if (posSlot < kEndPosModelIndex)\r | |
735 | {\r | |
736 | prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits) - posSlot - 1;\r | |
737 | }\r | |
738 | else\r | |
739 | {\r | |
740 | numDirectBits -= kNumAlignBits;\r | |
741 | do\r | |
742 | {\r | |
743 | NORMALIZE_CHECK\r | |
744 | range >>= 1;\r | |
745 | code -= range & (((code - range) >> 31) - 1);\r | |
746 | /* if (code >= range) code -= range; */\r | |
747 | }\r | |
748 | while (--numDirectBits != 0);\r | |
749 | prob = probs + Align;\r | |
750 | numDirectBits = kNumAlignBits;\r | |
751 | }\r | |
752 | {\r | |
753 | unsigned i = 1;\r | |
754 | do\r | |
755 | {\r | |
756 | GET_BIT_CHECK(prob + i, i);\r | |
757 | }\r | |
758 | while (--numDirectBits != 0);\r | |
759 | }\r | |
760 | }\r | |
761 | }\r | |
762 | }\r | |
763 | }\r | |
764 | NORMALIZE_CHECK;\r | |
765 | return res;\r | |
766 | }\r | |
767 | \r | |
768 | \r | |
30fdf114 LG |
769 | void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)\r |
770 | {\r | |
771 | p->needFlush = 1;\r | |
772 | p->remainLen = 0;\r | |
773 | p->tempBufSize = 0;\r | |
774 | \r | |
775 | if (initDic)\r | |
776 | {\r | |
777 | p->processedPos = 0;\r | |
778 | p->checkDicSize = 0;\r | |
779 | p->needInitState = 1;\r | |
780 | }\r | |
781 | if (initState)\r | |
782 | p->needInitState = 1;\r | |
783 | }\r | |
784 | \r | |
785 | void LzmaDec_Init(CLzmaDec *p)\r | |
786 | {\r | |
787 | p->dicPos = 0;\r | |
788 | LzmaDec_InitDicAndState(p, True, True);\r | |
789 | }\r | |
790 | \r | |
791 | static void LzmaDec_InitStateReal(CLzmaDec *p)\r | |
792 | {\r | |
c4ab09ef LG |
793 | SizeT numProbs = LzmaProps_GetNumProbs(&p->prop);\r |
794 | SizeT i;\r | |
30fdf114 LG |
795 | CLzmaProb *probs = p->probs;\r |
796 | for (i = 0; i < numProbs; i++)\r | |
797 | probs[i] = kBitModelTotal >> 1;\r | |
798 | p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;\r | |
799 | p->state = 0;\r | |
800 | p->needInitState = 0;\r | |
801 | }\r | |
802 | \r | |
803 | SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen,\r | |
804 | ELzmaFinishMode finishMode, ELzmaStatus *status)\r | |
805 | {\r | |
806 | SizeT inSize = *srcLen;\r | |
807 | (*srcLen) = 0;\r | |
808 | LzmaDec_WriteRem(p, dicLimit);\r | |
809 | \r | |
810 | *status = LZMA_STATUS_NOT_SPECIFIED;\r | |
811 | \r | |
812 | while (p->remainLen != kMatchSpecLenStart)\r | |
813 | {\r | |
814 | int checkEndMarkNow;\r | |
815 | \r | |
c4ab09ef | 816 | if (p->needFlush)\r |
30fdf114 LG |
817 | {\r |
818 | for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--)\r | |
819 | p->tempBuf[p->tempBufSize++] = *src++;\r | |
820 | if (p->tempBufSize < RC_INIT_SIZE)\r | |
821 | {\r | |
822 | *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r | |
823 | return SZ_OK;\r | |
824 | }\r | |
825 | if (p->tempBuf[0] != 0)\r | |
826 | return SZ_ERROR_DATA;\r | |
c4ab09ef LG |
827 | p->code =\r |
828 | ((UInt32)p->tempBuf[1] << 24)\r | |
829 | | ((UInt32)p->tempBuf[2] << 16)\r | |
830 | | ((UInt32)p->tempBuf[3] << 8)\r | |
831 | | ((UInt32)p->tempBuf[4]);\r | |
832 | p->range = 0xFFFFFFFF;\r | |
833 | p->needFlush = 0;\r | |
30fdf114 LG |
834 | p->tempBufSize = 0;\r |
835 | }\r | |
836 | \r | |
837 | checkEndMarkNow = 0;\r | |
838 | if (p->dicPos >= dicLimit)\r | |
839 | {\r | |
840 | if (p->remainLen == 0 && p->code == 0)\r | |
841 | {\r | |
842 | *status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK;\r | |
843 | return SZ_OK;\r | |
844 | }\r | |
845 | if (finishMode == LZMA_FINISH_ANY)\r | |
846 | {\r | |
847 | *status = LZMA_STATUS_NOT_FINISHED;\r | |
848 | return SZ_OK;\r | |
849 | }\r | |
850 | if (p->remainLen != 0)\r | |
851 | {\r | |
852 | *status = LZMA_STATUS_NOT_FINISHED;\r | |
853 | return SZ_ERROR_DATA;\r | |
854 | }\r | |
855 | checkEndMarkNow = 1;\r | |
856 | }\r | |
857 | \r | |
858 | if (p->needInitState)\r | |
859 | LzmaDec_InitStateReal(p);\r | |
860 | \r | |
861 | if (p->tempBufSize == 0)\r | |
862 | {\r | |
863 | SizeT processed;\r | |
864 | const Byte *bufLimit;\r | |
865 | if (inSize < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)\r | |
866 | {\r | |
867 | int dummyRes = LzmaDec_TryDummy(p, src, inSize);\r | |
868 | if (dummyRes == DUMMY_ERROR)\r | |
869 | {\r | |
870 | memcpy(p->tempBuf, src, inSize);\r | |
871 | p->tempBufSize = (unsigned)inSize;\r | |
872 | (*srcLen) += inSize;\r | |
873 | *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r | |
874 | return SZ_OK;\r | |
875 | }\r | |
876 | if (checkEndMarkNow && dummyRes != DUMMY_MATCH)\r | |
877 | {\r | |
878 | *status = LZMA_STATUS_NOT_FINISHED;\r | |
879 | return SZ_ERROR_DATA;\r | |
880 | }\r | |
881 | bufLimit = src;\r | |
882 | }\r | |
883 | else\r | |
884 | bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX;\r | |
885 | p->buf = src;\r | |
886 | if (LzmaDec_DecodeReal2(p, dicLimit, bufLimit) != 0)\r | |
887 | return SZ_ERROR_DATA;\r | |
888 | processed = (SizeT)(p->buf - src);\r | |
889 | (*srcLen) += processed;\r | |
890 | src += processed;\r | |
891 | inSize -= processed;\r | |
892 | }\r | |
893 | else\r | |
894 | {\r | |
895 | unsigned rem = p->tempBufSize, lookAhead = 0;\r | |
896 | while (rem < LZMA_REQUIRED_INPUT_MAX && lookAhead < inSize)\r | |
897 | p->tempBuf[rem++] = src[lookAhead++];\r | |
898 | p->tempBufSize = rem;\r | |
899 | if (rem < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)\r | |
900 | {\r | |
901 | int dummyRes = LzmaDec_TryDummy(p, p->tempBuf, rem);\r | |
902 | if (dummyRes == DUMMY_ERROR)\r | |
903 | {\r | |
904 | (*srcLen) += lookAhead;\r | |
905 | *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r | |
906 | return SZ_OK;\r | |
907 | }\r | |
908 | if (checkEndMarkNow && dummyRes != DUMMY_MATCH)\r | |
909 | {\r | |
910 | *status = LZMA_STATUS_NOT_FINISHED;\r | |
911 | return SZ_ERROR_DATA;\r | |
912 | }\r | |
913 | }\r | |
914 | p->buf = p->tempBuf;\r | |
915 | if (LzmaDec_DecodeReal2(p, dicLimit, p->buf) != 0)\r | |
916 | return SZ_ERROR_DATA;\r | |
c4ab09ef LG |
917 | \r |
918 | {\r | |
919 | unsigned kkk = (unsigned)(p->buf - p->tempBuf);\r | |
920 | if (rem < kkk)\r | |
921 | return SZ_ERROR_FAIL; /* some internal error */\r | |
922 | rem -= kkk;\r | |
923 | if (lookAhead < rem)\r | |
924 | return SZ_ERROR_FAIL; /* some internal error */\r | |
925 | lookAhead -= rem;\r | |
926 | }\r | |
30fdf114 LG |
927 | (*srcLen) += lookAhead;\r |
928 | src += lookAhead;\r | |
929 | inSize -= lookAhead;\r | |
930 | p->tempBufSize = 0;\r | |
931 | }\r | |
932 | }\r | |
933 | if (p->code == 0)\r | |
934 | *status = LZMA_STATUS_FINISHED_WITH_MARK;\r | |
935 | return (p->code == 0) ? SZ_OK : SZ_ERROR_DATA;\r | |
936 | }\r | |
937 | \r | |
938 | SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)\r | |
939 | {\r | |
940 | SizeT outSize = *destLen;\r | |
941 | SizeT inSize = *srcLen;\r | |
942 | *srcLen = *destLen = 0;\r | |
943 | for (;;)\r | |
944 | {\r | |
945 | SizeT inSizeCur = inSize, outSizeCur, dicPos;\r | |
946 | ELzmaFinishMode curFinishMode;\r | |
947 | SRes res;\r | |
948 | if (p->dicPos == p->dicBufSize)\r | |
949 | p->dicPos = 0;\r | |
950 | dicPos = p->dicPos;\r | |
951 | if (outSize > p->dicBufSize - dicPos)\r | |
952 | {\r | |
953 | outSizeCur = p->dicBufSize;\r | |
954 | curFinishMode = LZMA_FINISH_ANY;\r | |
955 | }\r | |
956 | else\r | |
957 | {\r | |
958 | outSizeCur = dicPos + outSize;\r | |
959 | curFinishMode = finishMode;\r | |
960 | }\r | |
961 | \r | |
962 | res = LzmaDec_DecodeToDic(p, outSizeCur, src, &inSizeCur, curFinishMode, status);\r | |
963 | src += inSizeCur;\r | |
964 | inSize -= inSizeCur;\r | |
965 | *srcLen += inSizeCur;\r | |
966 | outSizeCur = p->dicPos - dicPos;\r | |
967 | memcpy(dest, p->dic + dicPos, outSizeCur);\r | |
968 | dest += outSizeCur;\r | |
969 | outSize -= outSizeCur;\r | |
970 | *destLen += outSizeCur;\r | |
971 | if (res != 0)\r | |
972 | return res;\r | |
973 | if (outSizeCur == 0 || outSize == 0)\r | |
974 | return SZ_OK;\r | |
975 | }\r | |
976 | }\r | |
977 | \r | |
978 | void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc)\r | |
979 | {\r | |
980 | alloc->Free(alloc, p->probs);\r | |
c4ab09ef | 981 | p->probs = NULL;\r |
30fdf114 LG |
982 | }\r |
983 | \r | |
984 | static void LzmaDec_FreeDict(CLzmaDec *p, ISzAlloc *alloc)\r | |
985 | {\r | |
986 | alloc->Free(alloc, p->dic);\r | |
c4ab09ef | 987 | p->dic = NULL;\r |
30fdf114 LG |
988 | }\r |
989 | \r | |
990 | void LzmaDec_Free(CLzmaDec *p, ISzAlloc *alloc)\r | |
991 | {\r | |
992 | LzmaDec_FreeProbs(p, alloc);\r | |
993 | LzmaDec_FreeDict(p, alloc);\r | |
994 | }\r | |
995 | \r | |
996 | SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size)\r | |
997 | {\r | |
998 | UInt32 dicSize;\r | |
999 | Byte d;\r | |
1000 | \r | |
1001 | if (size < LZMA_PROPS_SIZE)\r | |
1002 | return SZ_ERROR_UNSUPPORTED;\r | |
1003 | else\r | |
1004 | dicSize = data[1] | ((UInt32)data[2] << 8) | ((UInt32)data[3] << 16) | ((UInt32)data[4] << 24);\r | |
1005 | \r | |
1006 | if (dicSize < LZMA_DIC_MIN)\r | |
1007 | dicSize = LZMA_DIC_MIN;\r | |
1008 | p->dicSize = dicSize;\r | |
1009 | \r | |
1010 | d = data[0];\r | |
1011 | if (d >= (9 * 5 * 5))\r | |
1012 | return SZ_ERROR_UNSUPPORTED;\r | |
1013 | \r | |
1014 | p->lc = d % 9;\r | |
1015 | d /= 9;\r | |
1016 | p->pb = d / 5;\r | |
1017 | p->lp = d % 5;\r | |
1018 | \r | |
1019 | return SZ_OK;\r | |
1020 | }\r | |
1021 | \r | |
1022 | static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAlloc *alloc)\r | |
1023 | {\r | |
1024 | UInt32 numProbs = LzmaProps_GetNumProbs(propNew);\r | |
c4ab09ef | 1025 | if (!p->probs || numProbs != p->numProbs)\r |
30fdf114 LG |
1026 | {\r |
1027 | LzmaDec_FreeProbs(p, alloc);\r | |
1028 | p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb));\r | |
1029 | p->numProbs = numProbs;\r | |
c4ab09ef | 1030 | if (!p->probs)\r |
30fdf114 LG |
1031 | return SZ_ERROR_MEM;\r |
1032 | }\r | |
1033 | return SZ_OK;\r | |
1034 | }\r | |
1035 | \r | |
1036 | SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc)\r | |
1037 | {\r | |
1038 | CLzmaProps propNew;\r | |
1039 | RINOK(LzmaProps_Decode(&propNew, props, propsSize));\r | |
1040 | RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));\r | |
1041 | p->prop = propNew;\r | |
1042 | return SZ_OK;\r | |
1043 | }\r | |
1044 | \r | |
1045 | SRes LzmaDec_Allocate(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc)\r | |
1046 | {\r | |
1047 | CLzmaProps propNew;\r | |
1048 | SizeT dicBufSize;\r | |
1049 | RINOK(LzmaProps_Decode(&propNew, props, propsSize));\r | |
1050 | RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));\r | |
c4ab09ef LG |
1051 | \r |
1052 | {\r | |
1053 | UInt32 dictSize = propNew.dicSize;\r | |
1054 | SizeT mask = ((UInt32)1 << 12) - 1;\r | |
1055 | if (dictSize >= ((UInt32)1 << 30)) mask = ((UInt32)1 << 22) - 1;\r | |
1056 | else if (dictSize >= ((UInt32)1 << 22)) mask = ((UInt32)1 << 20) - 1;;\r | |
1057 | dicBufSize = ((SizeT)dictSize + mask) & ~mask;\r | |
1058 | if (dicBufSize < dictSize)\r | |
1059 | dicBufSize = dictSize;\r | |
1060 | }\r | |
1061 | \r | |
1062 | if (!p->dic || dicBufSize != p->dicBufSize)\r | |
30fdf114 LG |
1063 | {\r |
1064 | LzmaDec_FreeDict(p, alloc);\r | |
1065 | p->dic = (Byte *)alloc->Alloc(alloc, dicBufSize);\r | |
c4ab09ef | 1066 | if (!p->dic)\r |
30fdf114 LG |
1067 | {\r |
1068 | LzmaDec_FreeProbs(p, alloc);\r | |
1069 | return SZ_ERROR_MEM;\r | |
1070 | }\r | |
1071 | }\r | |
1072 | p->dicBufSize = dicBufSize;\r | |
1073 | p->prop = propNew;\r | |
1074 | return SZ_OK;\r | |
1075 | }\r | |
1076 | \r | |
1077 | SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,\r | |
1078 | const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,\r | |
1079 | ELzmaStatus *status, ISzAlloc *alloc)\r | |
1080 | {\r | |
1081 | CLzmaDec p;\r | |
1082 | SRes res;\r | |
c4ab09ef LG |
1083 | SizeT outSize = *destLen, inSize = *srcLen;\r |
1084 | *destLen = *srcLen = 0;\r | |
1085 | *status = LZMA_STATUS_NOT_SPECIFIED;\r | |
30fdf114 LG |
1086 | if (inSize < RC_INIT_SIZE)\r |
1087 | return SZ_ERROR_INPUT_EOF;\r | |
30fdf114 | 1088 | LzmaDec_Construct(&p);\r |
c4ab09ef | 1089 | RINOK(LzmaDec_AllocateProbs(&p, propData, propSize, alloc));\r |
30fdf114 LG |
1090 | p.dic = dest;\r |
1091 | p.dicBufSize = outSize;\r | |
30fdf114 | 1092 | LzmaDec_Init(&p);\r |
30fdf114 LG |
1093 | *srcLen = inSize;\r |
1094 | res = LzmaDec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);\r | |
c4ab09ef | 1095 | *destLen = p.dicPos;\r |
30fdf114 LG |
1096 | if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)\r |
1097 | res = SZ_ERROR_INPUT_EOF;\r | |
30fdf114 LG |
1098 | LzmaDec_FreeProbs(&p, alloc);\r |
1099 | return res;\r | |
1100 | }\r |