Scott Baker | e7144bc | 2019-10-01 14:16:47 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2016-present, 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 | |
| 12 | #include <stddef.h> /* size_t, ptrdiff_t */ |
| 13 | #include "zstd_v03.h" |
| 14 | #include "error_private.h" |
| 15 | |
| 16 | |
| 17 | /****************************************** |
| 18 | * Compiler-specific |
| 19 | ******************************************/ |
| 20 | #if defined(_MSC_VER) /* Visual Studio */ |
| 21 | # include <stdlib.h> /* _byteswap_ulong */ |
| 22 | # include <intrin.h> /* _byteswap_* */ |
| 23 | #endif |
| 24 | |
| 25 | |
| 26 | |
| 27 | /* ****************************************************************** |
| 28 | mem.h |
| 29 | low-level memory access routines |
| 30 | Copyright (C) 2013-2015, Yann Collet. |
| 31 | |
| 32 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 33 | |
| 34 | Redistribution and use in source and binary forms, with or without |
| 35 | modification, are permitted provided that the following conditions are |
| 36 | met: |
| 37 | |
| 38 | * Redistributions of source code must retain the above copyright |
| 39 | notice, this list of conditions and the following disclaimer. |
| 40 | * Redistributions in binary form must reproduce the above |
| 41 | copyright notice, this list of conditions and the following disclaimer |
| 42 | in the documentation and/or other materials provided with the |
| 43 | distribution. |
| 44 | |
| 45 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 46 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 47 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 48 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 49 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 50 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 51 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 52 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 53 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 54 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 55 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 56 | |
| 57 | You can contact the author at : |
| 58 | - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 59 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 60 | ****************************************************************** */ |
| 61 | #ifndef MEM_H_MODULE |
| 62 | #define MEM_H_MODULE |
| 63 | |
| 64 | #if defined (__cplusplus) |
| 65 | extern "C" { |
| 66 | #endif |
| 67 | |
| 68 | /****************************************** |
| 69 | * Includes |
| 70 | ******************************************/ |
| 71 | #include <stddef.h> /* size_t, ptrdiff_t */ |
| 72 | #include <string.h> /* memcpy */ |
| 73 | |
| 74 | |
| 75 | /****************************************** |
| 76 | * Compiler-specific |
| 77 | ******************************************/ |
| 78 | #if defined(__GNUC__) |
| 79 | # define MEM_STATIC static __attribute__((unused)) |
| 80 | #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
| 81 | # define MEM_STATIC static inline |
| 82 | #elif defined(_MSC_VER) |
| 83 | # define MEM_STATIC static __inline |
| 84 | #else |
| 85 | # define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ |
| 86 | #endif |
| 87 | |
| 88 | |
| 89 | /**************************************************************** |
| 90 | * Basic Types |
| 91 | *****************************************************************/ |
| 92 | #if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
| 93 | # include <stdint.h> |
| 94 | typedef uint8_t BYTE; |
| 95 | typedef uint16_t U16; |
| 96 | typedef int16_t S16; |
| 97 | typedef uint32_t U32; |
| 98 | typedef int32_t S32; |
| 99 | typedef uint64_t U64; |
| 100 | typedef int64_t S64; |
| 101 | #else |
| 102 | typedef unsigned char BYTE; |
| 103 | typedef unsigned short U16; |
| 104 | typedef signed short S16; |
| 105 | typedef unsigned int U32; |
| 106 | typedef signed int S32; |
| 107 | typedef unsigned long long U64; |
| 108 | typedef signed long long S64; |
| 109 | #endif |
| 110 | |
| 111 | |
| 112 | /**************************************************************** |
| 113 | * Memory I/O |
| 114 | *****************************************************************/ |
| 115 | /* MEM_FORCE_MEMORY_ACCESS |
| 116 | * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. |
| 117 | * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. |
| 118 | * The below switch allow to select different access method for improved performance. |
| 119 | * Method 0 (default) : use `memcpy()`. Safe and portable. |
| 120 | * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). |
| 121 | * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. |
| 122 | * Method 2 : direct access. This method is portable but violate C standard. |
| 123 | * It can generate buggy code on targets generating assembly depending on alignment. |
| 124 | * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) |
| 125 | * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. |
| 126 | * Prefer these methods in priority order (0 > 1 > 2) |
| 127 | */ |
| 128 | #ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ |
| 129 | # if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) |
| 130 | # define MEM_FORCE_MEMORY_ACCESS 2 |
| 131 | # elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \ |
| 132 | (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) |
| 133 | # define MEM_FORCE_MEMORY_ACCESS 1 |
| 134 | # endif |
| 135 | #endif |
| 136 | |
| 137 | MEM_STATIC unsigned MEM_32bits(void) { return sizeof(void*)==4; } |
| 138 | MEM_STATIC unsigned MEM_64bits(void) { return sizeof(void*)==8; } |
| 139 | |
| 140 | MEM_STATIC unsigned MEM_isLittleEndian(void) |
| 141 | { |
| 142 | const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ |
| 143 | return one.c[0]; |
| 144 | } |
| 145 | |
| 146 | #if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) |
| 147 | |
| 148 | /* violates C standard on structure alignment. |
| 149 | Only use if no other choice to achieve best performance on target platform */ |
| 150 | MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } |
| 151 | MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } |
| 152 | MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } |
| 153 | |
| 154 | MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } |
| 155 | |
| 156 | #elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) |
| 157 | |
| 158 | /* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ |
| 159 | /* currently only defined for gcc and icc */ |
| 160 | typedef union { U16 u16; U32 u32; U64 u64; } __attribute__((packed)) unalign; |
| 161 | |
| 162 | MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } |
| 163 | MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } |
| 164 | MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } |
| 165 | |
| 166 | MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } |
| 167 | |
| 168 | #else |
| 169 | |
| 170 | /* default method, safe and standard. |
| 171 | can sometimes prove slower */ |
| 172 | |
| 173 | MEM_STATIC U16 MEM_read16(const void* memPtr) |
| 174 | { |
| 175 | U16 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 176 | } |
| 177 | |
| 178 | MEM_STATIC U32 MEM_read32(const void* memPtr) |
| 179 | { |
| 180 | U32 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 181 | } |
| 182 | |
| 183 | MEM_STATIC U64 MEM_read64(const void* memPtr) |
| 184 | { |
| 185 | U64 val; memcpy(&val, memPtr, sizeof(val)); return val; |
| 186 | } |
| 187 | |
| 188 | MEM_STATIC void MEM_write16(void* memPtr, U16 value) |
| 189 | { |
| 190 | memcpy(memPtr, &value, sizeof(value)); |
| 191 | } |
| 192 | |
| 193 | |
| 194 | #endif // MEM_FORCE_MEMORY_ACCESS |
| 195 | |
| 196 | |
| 197 | MEM_STATIC U16 MEM_readLE16(const void* memPtr) |
| 198 | { |
| 199 | if (MEM_isLittleEndian()) |
| 200 | return MEM_read16(memPtr); |
| 201 | else |
| 202 | { |
| 203 | const BYTE* p = (const BYTE*)memPtr; |
| 204 | return (U16)(p[0] + (p[1]<<8)); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) |
| 209 | { |
| 210 | if (MEM_isLittleEndian()) |
| 211 | { |
| 212 | MEM_write16(memPtr, val); |
| 213 | } |
| 214 | else |
| 215 | { |
| 216 | BYTE* p = (BYTE*)memPtr; |
| 217 | p[0] = (BYTE)val; |
| 218 | p[1] = (BYTE)(val>>8); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | MEM_STATIC U32 MEM_readLE32(const void* memPtr) |
| 223 | { |
| 224 | if (MEM_isLittleEndian()) |
| 225 | return MEM_read32(memPtr); |
| 226 | else |
| 227 | { |
| 228 | const BYTE* p = (const BYTE*)memPtr; |
| 229 | return (U32)((U32)p[0] + ((U32)p[1]<<8) + ((U32)p[2]<<16) + ((U32)p[3]<<24)); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | MEM_STATIC U64 MEM_readLE64(const void* memPtr) |
| 234 | { |
| 235 | if (MEM_isLittleEndian()) |
| 236 | return MEM_read64(memPtr); |
| 237 | else |
| 238 | { |
| 239 | const BYTE* p = (const BYTE*)memPtr; |
| 240 | return (U64)((U64)p[0] + ((U64)p[1]<<8) + ((U64)p[2]<<16) + ((U64)p[3]<<24) |
| 241 | + ((U64)p[4]<<32) + ((U64)p[5]<<40) + ((U64)p[6]<<48) + ((U64)p[7]<<56)); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | |
| 246 | MEM_STATIC size_t MEM_readLEST(const void* memPtr) |
| 247 | { |
| 248 | if (MEM_32bits()) |
| 249 | return (size_t)MEM_readLE32(memPtr); |
| 250 | else |
| 251 | return (size_t)MEM_readLE64(memPtr); |
| 252 | } |
| 253 | |
| 254 | |
| 255 | #if defined (__cplusplus) |
| 256 | } |
| 257 | #endif |
| 258 | |
| 259 | #endif /* MEM_H_MODULE */ |
| 260 | |
| 261 | |
| 262 | /* ****************************************************************** |
| 263 | bitstream |
| 264 | Part of NewGen Entropy library |
| 265 | header file (to include) |
| 266 | Copyright (C) 2013-2015, Yann Collet. |
| 267 | |
| 268 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 269 | |
| 270 | Redistribution and use in source and binary forms, with or without |
| 271 | modification, are permitted provided that the following conditions are |
| 272 | met: |
| 273 | |
| 274 | * Redistributions of source code must retain the above copyright |
| 275 | notice, this list of conditions and the following disclaimer. |
| 276 | * Redistributions in binary form must reproduce the above |
| 277 | copyright notice, this list of conditions and the following disclaimer |
| 278 | in the documentation and/or other materials provided with the |
| 279 | distribution. |
| 280 | |
| 281 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 282 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 283 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 284 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 285 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 286 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 287 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 288 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 289 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 290 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 291 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 292 | |
| 293 | You can contact the author at : |
| 294 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 295 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 296 | ****************************************************************** */ |
| 297 | #ifndef BITSTREAM_H_MODULE |
| 298 | #define BITSTREAM_H_MODULE |
| 299 | |
| 300 | #if defined (__cplusplus) |
| 301 | extern "C" { |
| 302 | #endif |
| 303 | |
| 304 | |
| 305 | /* |
| 306 | * This API consists of small unitary functions, which highly benefit from being inlined. |
| 307 | * Since link-time-optimization is not available for all compilers, |
| 308 | * these functions are defined into a .h to be included. |
| 309 | */ |
| 310 | |
| 311 | |
| 312 | /********************************************** |
| 313 | * bitStream decompression API (read backward) |
| 314 | **********************************************/ |
| 315 | typedef struct |
| 316 | { |
| 317 | size_t bitContainer; |
| 318 | unsigned bitsConsumed; |
| 319 | const char* ptr; |
| 320 | const char* start; |
| 321 | } BIT_DStream_t; |
| 322 | |
| 323 | typedef enum { BIT_DStream_unfinished = 0, |
| 324 | BIT_DStream_endOfBuffer = 1, |
| 325 | BIT_DStream_completed = 2, |
| 326 | BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */ |
| 327 | /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ |
| 328 | |
| 329 | MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize); |
| 330 | MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits); |
| 331 | MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD); |
| 332 | MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD); |
| 333 | |
| 334 | |
| 335 | |
| 336 | /****************************************** |
| 337 | * unsafe API |
| 338 | ******************************************/ |
| 339 | MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits); |
| 340 | /* faster, but works only if nbBits >= 1 */ |
| 341 | |
| 342 | |
| 343 | |
| 344 | /**************************************************************** |
| 345 | * Helper functions |
| 346 | ****************************************************************/ |
| 347 | MEM_STATIC unsigned BIT_highbit32 (U32 val) |
| 348 | { |
| 349 | # if defined(_MSC_VER) /* Visual */ |
| 350 | unsigned long r=0; |
| 351 | _BitScanReverse ( &r, val ); |
| 352 | return (unsigned) r; |
| 353 | # elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ |
| 354 | return 31 - __builtin_clz (val); |
| 355 | # else /* Software version */ |
| 356 | static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; |
| 357 | U32 v = val; |
| 358 | unsigned r; |
| 359 | v |= v >> 1; |
| 360 | v |= v >> 2; |
| 361 | v |= v >> 4; |
| 362 | v |= v >> 8; |
| 363 | v |= v >> 16; |
| 364 | r = DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; |
| 365 | return r; |
| 366 | # endif |
| 367 | } |
| 368 | |
| 369 | |
| 370 | |
| 371 | /********************************************************** |
| 372 | * bitStream decoding |
| 373 | **********************************************************/ |
| 374 | |
| 375 | /*!BIT_initDStream |
| 376 | * Initialize a BIT_DStream_t. |
| 377 | * @bitD : a pointer to an already allocated BIT_DStream_t structure |
| 378 | * @srcBuffer must point at the beginning of a bitStream |
| 379 | * @srcSize must be the exact size of the bitStream |
| 380 | * @result : size of stream (== srcSize) or an errorCode if a problem is detected |
| 381 | */ |
| 382 | MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize) |
| 383 | { |
| 384 | if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } |
| 385 | |
| 386 | if (srcSize >= sizeof(size_t)) /* normal case */ |
| 387 | { |
| 388 | U32 contain32; |
| 389 | bitD->start = (const char*)srcBuffer; |
| 390 | bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(size_t); |
| 391 | bitD->bitContainer = MEM_readLEST(bitD->ptr); |
| 392 | contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; |
| 393 | if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ |
| 394 | bitD->bitsConsumed = 8 - BIT_highbit32(contain32); |
| 395 | } |
| 396 | else |
| 397 | { |
| 398 | U32 contain32; |
| 399 | bitD->start = (const char*)srcBuffer; |
| 400 | bitD->ptr = bitD->start; |
| 401 | bitD->bitContainer = *(const BYTE*)(bitD->start); |
| 402 | switch(srcSize) |
| 403 | { |
| 404 | case 7: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[6]) << (sizeof(size_t)*8 - 16); |
| 405 | case 6: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[5]) << (sizeof(size_t)*8 - 24); |
| 406 | case 5: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[4]) << (sizeof(size_t)*8 - 32); |
| 407 | case 4: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[3]) << 24; |
| 408 | case 3: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[2]) << 16; |
| 409 | case 2: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[1]) << 8; |
| 410 | default:; |
| 411 | } |
| 412 | contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; |
| 413 | if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ |
| 414 | bitD->bitsConsumed = 8 - BIT_highbit32(contain32); |
| 415 | bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8; |
| 416 | } |
| 417 | |
| 418 | return srcSize; |
| 419 | } |
| 420 | MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits) |
| 421 | { |
| 422 | const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; |
| 423 | return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); |
| 424 | } |
| 425 | |
| 426 | /*! BIT_lookBitsFast : |
| 427 | * unsafe version; only works only if nbBits >= 1 */ |
| 428 | MEM_STATIC size_t BIT_lookBitsFast(BIT_DStream_t* bitD, U32 nbBits) |
| 429 | { |
| 430 | const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; |
| 431 | return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); |
| 432 | } |
| 433 | |
| 434 | MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits) |
| 435 | { |
| 436 | bitD->bitsConsumed += nbBits; |
| 437 | } |
| 438 | |
| 439 | MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits) |
| 440 | { |
| 441 | size_t value = BIT_lookBits(bitD, nbBits); |
| 442 | BIT_skipBits(bitD, nbBits); |
| 443 | return value; |
| 444 | } |
| 445 | |
| 446 | /*!BIT_readBitsFast : |
| 447 | * unsafe version; only works only if nbBits >= 1 */ |
| 448 | MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits) |
| 449 | { |
| 450 | size_t value = BIT_lookBitsFast(bitD, nbBits); |
| 451 | BIT_skipBits(bitD, nbBits); |
| 452 | return value; |
| 453 | } |
| 454 | |
| 455 | MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD) |
| 456 | { |
| 457 | if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */ |
| 458 | return BIT_DStream_overflow; |
| 459 | |
| 460 | if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) |
| 461 | { |
| 462 | bitD->ptr -= bitD->bitsConsumed >> 3; |
| 463 | bitD->bitsConsumed &= 7; |
| 464 | bitD->bitContainer = MEM_readLEST(bitD->ptr); |
| 465 | return BIT_DStream_unfinished; |
| 466 | } |
| 467 | if (bitD->ptr == bitD->start) |
| 468 | { |
| 469 | if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer; |
| 470 | return BIT_DStream_completed; |
| 471 | } |
| 472 | { |
| 473 | U32 nbBytes = bitD->bitsConsumed >> 3; |
| 474 | BIT_DStream_status result = BIT_DStream_unfinished; |
| 475 | if (bitD->ptr - nbBytes < bitD->start) |
| 476 | { |
| 477 | nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ |
| 478 | result = BIT_DStream_endOfBuffer; |
| 479 | } |
| 480 | bitD->ptr -= nbBytes; |
| 481 | bitD->bitsConsumed -= nbBytes*8; |
| 482 | bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ |
| 483 | return result; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | /*! BIT_endOfDStream |
| 488 | * @return Tells if DStream has reached its exact end |
| 489 | */ |
| 490 | MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream) |
| 491 | { |
| 492 | return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); |
| 493 | } |
| 494 | |
| 495 | #if defined (__cplusplus) |
| 496 | } |
| 497 | #endif |
| 498 | |
| 499 | #endif /* BITSTREAM_H_MODULE */ |
| 500 | /* ****************************************************************** |
| 501 | Error codes and messages |
| 502 | Copyright (C) 2013-2015, Yann Collet |
| 503 | |
| 504 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 505 | |
| 506 | Redistribution and use in source and binary forms, with or without |
| 507 | modification, are permitted provided that the following conditions are |
| 508 | met: |
| 509 | |
| 510 | * Redistributions of source code must retain the above copyright |
| 511 | notice, this list of conditions and the following disclaimer. |
| 512 | * Redistributions in binary form must reproduce the above |
| 513 | copyright notice, this list of conditions and the following disclaimer |
| 514 | in the documentation and/or other materials provided with the |
| 515 | distribution. |
| 516 | |
| 517 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 518 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 519 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 520 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 521 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 522 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 523 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 524 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 525 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 526 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 527 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 528 | |
| 529 | You can contact the author at : |
| 530 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 531 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 532 | ****************************************************************** */ |
| 533 | #ifndef ERROR_H_MODULE |
| 534 | #define ERROR_H_MODULE |
| 535 | |
| 536 | #if defined (__cplusplus) |
| 537 | extern "C" { |
| 538 | #endif |
| 539 | |
| 540 | |
| 541 | /****************************************** |
| 542 | * Compiler-specific |
| 543 | ******************************************/ |
| 544 | #if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
| 545 | # define ERR_STATIC static inline |
| 546 | #elif defined(_MSC_VER) |
| 547 | # define ERR_STATIC static __inline |
| 548 | #elif defined(__GNUC__) |
| 549 | # define ERR_STATIC static __attribute__((unused)) |
| 550 | #else |
| 551 | # define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ |
| 552 | #endif |
| 553 | |
| 554 | |
| 555 | /****************************************** |
| 556 | * Error Management |
| 557 | ******************************************/ |
| 558 | #define PREFIX(name) ZSTD_error_##name |
| 559 | |
| 560 | #define ERROR(name) (size_t)-PREFIX(name) |
| 561 | |
| 562 | #define ERROR_LIST(ITEM) \ |
| 563 | ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \ |
| 564 | ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \ |
| 565 | ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \ |
| 566 | ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \ |
| 567 | ITEM(PREFIX(maxCode)) |
| 568 | |
| 569 | #define ERROR_GENERATE_ENUM(ENUM) ENUM, |
| 570 | typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */ |
| 571 | |
| 572 | #define ERROR_CONVERTTOSTRING(STRING) #STRING, |
| 573 | #define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR) |
| 574 | static const char* ERR_strings[] = { ERROR_LIST(ERROR_GENERATE_STRING) }; |
| 575 | |
| 576 | ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); } |
| 577 | |
| 578 | ERR_STATIC const char* ERR_getErrorName(size_t code) |
| 579 | { |
| 580 | static const char* codeError = "Unspecified error code"; |
| 581 | if (ERR_isError(code)) return ERR_strings[-(int)(code)]; |
| 582 | return codeError; |
| 583 | } |
| 584 | |
| 585 | |
| 586 | #if defined (__cplusplus) |
| 587 | } |
| 588 | #endif |
| 589 | |
| 590 | #endif /* ERROR_H_MODULE */ |
| 591 | /* |
| 592 | Constructor and Destructor of type FSE_CTable |
| 593 | Note that its size depends on 'tableLog' and 'maxSymbolValue' */ |
| 594 | typedef unsigned FSE_CTable; /* don't allocate that. It's just a way to be more restrictive than void* */ |
| 595 | typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ |
| 596 | |
| 597 | |
| 598 | /* ****************************************************************** |
| 599 | FSE : Finite State Entropy coder |
| 600 | header file for static linking (only) |
| 601 | Copyright (C) 2013-2015, Yann Collet |
| 602 | |
| 603 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 604 | |
| 605 | Redistribution and use in source and binary forms, with or without |
| 606 | modification, are permitted provided that the following conditions are |
| 607 | met: |
| 608 | |
| 609 | * Redistributions of source code must retain the above copyright |
| 610 | notice, this list of conditions and the following disclaimer. |
| 611 | * Redistributions in binary form must reproduce the above |
| 612 | copyright notice, this list of conditions and the following disclaimer |
| 613 | in the documentation and/or other materials provided with the |
| 614 | distribution. |
| 615 | |
| 616 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 617 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 618 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 619 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 620 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 621 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 622 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 623 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 624 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 625 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 626 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 627 | |
| 628 | You can contact the author at : |
| 629 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 630 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 631 | ****************************************************************** */ |
| 632 | #if defined (__cplusplus) |
| 633 | extern "C" { |
| 634 | #endif |
| 635 | |
| 636 | |
| 637 | /****************************************** |
| 638 | * Static allocation |
| 639 | ******************************************/ |
| 640 | /* FSE buffer bounds */ |
| 641 | #define FSE_NCOUNTBOUND 512 |
| 642 | #define FSE_BLOCKBOUND(size) (size + (size>>7)) |
| 643 | #define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ |
| 644 | |
| 645 | /* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */ |
| 646 | #define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<(maxTableLog-1)) + ((maxSymbolValue+1)*2)) |
| 647 | #define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog)) |
| 648 | |
| 649 | |
| 650 | /****************************************** |
| 651 | * FSE advanced API |
| 652 | ******************************************/ |
| 653 | static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits); |
| 654 | /* build a fake FSE_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */ |
| 655 | |
| 656 | static size_t FSE_buildDTable_rle (FSE_DTable* dt, unsigned char symbolValue); |
| 657 | /* build a fake FSE_DTable, designed to always generate the same symbolValue */ |
| 658 | |
| 659 | |
| 660 | /****************************************** |
| 661 | * FSE symbol decompression API |
| 662 | ******************************************/ |
| 663 | typedef struct |
| 664 | { |
| 665 | size_t state; |
| 666 | const void* table; /* precise table may vary, depending on U16 */ |
| 667 | } FSE_DState_t; |
| 668 | |
| 669 | |
| 670 | static void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt); |
| 671 | |
| 672 | static unsigned char FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD); |
| 673 | |
| 674 | static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr); |
| 675 | |
| 676 | |
| 677 | /****************************************** |
| 678 | * FSE unsafe API |
| 679 | ******************************************/ |
| 680 | static unsigned char FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD); |
| 681 | /* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */ |
| 682 | |
| 683 | |
| 684 | /****************************************** |
| 685 | * Implementation of inline functions |
| 686 | ******************************************/ |
| 687 | |
| 688 | /* decompression */ |
| 689 | |
| 690 | typedef struct { |
| 691 | U16 tableLog; |
| 692 | U16 fastMode; |
| 693 | } FSE_DTableHeader; /* sizeof U32 */ |
| 694 | |
| 695 | typedef struct |
| 696 | { |
| 697 | unsigned short newState; |
| 698 | unsigned char symbol; |
| 699 | unsigned char nbBits; |
| 700 | } FSE_decode_t; /* size == U32 */ |
| 701 | |
| 702 | MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt) |
| 703 | { |
| 704 | FSE_DTableHeader DTableH; |
| 705 | memcpy(&DTableH, dt, sizeof(DTableH)); |
| 706 | DStatePtr->state = BIT_readBits(bitD, DTableH.tableLog); |
| 707 | BIT_reloadDStream(bitD); |
| 708 | DStatePtr->table = dt + 1; |
| 709 | } |
| 710 | |
| 711 | MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) |
| 712 | { |
| 713 | const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 714 | const U32 nbBits = DInfo.nbBits; |
| 715 | BYTE symbol = DInfo.symbol; |
| 716 | size_t lowBits = BIT_readBits(bitD, nbBits); |
| 717 | |
| 718 | DStatePtr->state = DInfo.newState + lowBits; |
| 719 | return symbol; |
| 720 | } |
| 721 | |
| 722 | MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD) |
| 723 | { |
| 724 | const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state]; |
| 725 | const U32 nbBits = DInfo.nbBits; |
| 726 | BYTE symbol = DInfo.symbol; |
| 727 | size_t lowBits = BIT_readBitsFast(bitD, nbBits); |
| 728 | |
| 729 | DStatePtr->state = DInfo.newState + lowBits; |
| 730 | return symbol; |
| 731 | } |
| 732 | |
| 733 | MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr) |
| 734 | { |
| 735 | return DStatePtr->state == 0; |
| 736 | } |
| 737 | |
| 738 | |
| 739 | #if defined (__cplusplus) |
| 740 | } |
| 741 | #endif |
| 742 | /* ****************************************************************** |
| 743 | Huff0 : Huffman coder, part of New Generation Entropy library |
| 744 | header file for static linking (only) |
| 745 | Copyright (C) 2013-2015, Yann Collet |
| 746 | |
| 747 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 748 | |
| 749 | Redistribution and use in source and binary forms, with or without |
| 750 | modification, are permitted provided that the following conditions are |
| 751 | met: |
| 752 | |
| 753 | * Redistributions of source code must retain the above copyright |
| 754 | notice, this list of conditions and the following disclaimer. |
| 755 | * Redistributions in binary form must reproduce the above |
| 756 | copyright notice, this list of conditions and the following disclaimer |
| 757 | in the documentation and/or other materials provided with the |
| 758 | distribution. |
| 759 | |
| 760 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 761 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 762 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 763 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 764 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 765 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 766 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 767 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 768 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 769 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 770 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 771 | |
| 772 | You can contact the author at : |
| 773 | - Source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 774 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 775 | ****************************************************************** */ |
| 776 | |
| 777 | #if defined (__cplusplus) |
| 778 | extern "C" { |
| 779 | #endif |
| 780 | |
| 781 | /****************************************** |
| 782 | * Static allocation macros |
| 783 | ******************************************/ |
| 784 | /* Huff0 buffer bounds */ |
| 785 | #define HUF_CTABLEBOUND 129 |
| 786 | #define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */ |
| 787 | #define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */ |
| 788 | |
| 789 | /* static allocation of Huff0's DTable */ |
| 790 | #define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<maxTableLog)) /* nb Cells; use unsigned short for X2, unsigned int for X4 */ |
| 791 | #define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ |
| 792 | unsigned short DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog } |
| 793 | #define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \ |
| 794 | unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog } |
| 795 | #define HUF_CREATE_STATIC_DTABLEX6(DTable, maxTableLog) \ |
| 796 | unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog) * 3 / 2] = { maxTableLog } |
| 797 | |
| 798 | |
| 799 | /****************************************** |
| 800 | * Advanced functions |
| 801 | ******************************************/ |
| 802 | static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ |
| 803 | static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbols decoder */ |
| 804 | |
| 805 | |
| 806 | #if defined (__cplusplus) |
| 807 | } |
| 808 | #endif |
| 809 | |
| 810 | /* |
| 811 | zstd - standard compression library |
| 812 | Header File |
| 813 | Copyright (C) 2014-2015, Yann Collet. |
| 814 | |
| 815 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 816 | |
| 817 | Redistribution and use in source and binary forms, with or without |
| 818 | modification, are permitted provided that the following conditions are |
| 819 | met: |
| 820 | * Redistributions of source code must retain the above copyright |
| 821 | notice, this list of conditions and the following disclaimer. |
| 822 | * Redistributions in binary form must reproduce the above |
| 823 | copyright notice, this list of conditions and the following disclaimer |
| 824 | in the documentation and/or other materials provided with the |
| 825 | distribution. |
| 826 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 827 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 828 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 829 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 830 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 831 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 832 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 833 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 834 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 835 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 836 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 837 | |
| 838 | You can contact the author at : |
| 839 | - zstd source repository : https://github.com/Cyan4973/zstd |
| 840 | - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c |
| 841 | */ |
| 842 | |
| 843 | #if defined (__cplusplus) |
| 844 | extern "C" { |
| 845 | #endif |
| 846 | |
| 847 | /* ************************************* |
| 848 | * Includes |
| 849 | ***************************************/ |
| 850 | #include <stddef.h> /* size_t */ |
| 851 | |
| 852 | |
| 853 | /* ************************************* |
| 854 | * Version |
| 855 | ***************************************/ |
| 856 | #define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */ |
| 857 | #define ZSTD_VERSION_MINOR 2 /* for new (non-breaking) interface capabilities */ |
| 858 | #define ZSTD_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */ |
| 859 | #define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE) |
| 860 | |
| 861 | |
| 862 | /* ************************************* |
| 863 | * Advanced functions |
| 864 | ***************************************/ |
| 865 | typedef struct ZSTD_CCtx_s ZSTD_CCtx; /* incomplete type */ |
| 866 | |
| 867 | #if defined (__cplusplus) |
| 868 | } |
| 869 | #endif |
| 870 | /* |
| 871 | zstd - standard compression library |
| 872 | Header File for static linking only |
| 873 | Copyright (C) 2014-2015, Yann Collet. |
| 874 | |
| 875 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 876 | |
| 877 | Redistribution and use in source and binary forms, with or without |
| 878 | modification, are permitted provided that the following conditions are |
| 879 | met: |
| 880 | * Redistributions of source code must retain the above copyright |
| 881 | notice, this list of conditions and the following disclaimer. |
| 882 | * Redistributions in binary form must reproduce the above |
| 883 | copyright notice, this list of conditions and the following disclaimer |
| 884 | in the documentation and/or other materials provided with the |
| 885 | distribution. |
| 886 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 887 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 888 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 889 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 890 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 891 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 892 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 893 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 894 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 895 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 896 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 897 | |
| 898 | You can contact the author at : |
| 899 | - zstd source repository : https://github.com/Cyan4973/zstd |
| 900 | - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c |
| 901 | */ |
| 902 | |
| 903 | /* The objects defined into this file should be considered experimental. |
| 904 | * They are not labelled stable, as their prototype may change in the future. |
| 905 | * You can use them for tests, provide feedback, or if you can endure risk of future changes. |
| 906 | */ |
| 907 | |
| 908 | #if defined (__cplusplus) |
| 909 | extern "C" { |
| 910 | #endif |
| 911 | |
| 912 | /* ************************************* |
| 913 | * Streaming functions |
| 914 | ***************************************/ |
| 915 | |
| 916 | typedef struct ZSTD_DCtx_s ZSTD_DCtx; |
| 917 | |
| 918 | /* |
| 919 | Use above functions alternatively. |
| 920 | ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue(). |
| 921 | ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block. |
| 922 | Result is the number of bytes regenerated within 'dst'. |
| 923 | It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header. |
| 924 | */ |
| 925 | |
| 926 | /* ************************************* |
| 927 | * Prefix - version detection |
| 928 | ***************************************/ |
| 929 | #define ZSTD_magicNumber 0xFD2FB523 /* v0.3 */ |
| 930 | |
| 931 | |
| 932 | #if defined (__cplusplus) |
| 933 | } |
| 934 | #endif |
| 935 | /* ****************************************************************** |
| 936 | FSE : Finite State Entropy coder |
| 937 | Copyright (C) 2013-2015, Yann Collet. |
| 938 | |
| 939 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 940 | |
| 941 | Redistribution and use in source and binary forms, with or without |
| 942 | modification, are permitted provided that the following conditions are |
| 943 | met: |
| 944 | |
| 945 | * Redistributions of source code must retain the above copyright |
| 946 | notice, this list of conditions and the following disclaimer. |
| 947 | * Redistributions in binary form must reproduce the above |
| 948 | copyright notice, this list of conditions and the following disclaimer |
| 949 | in the documentation and/or other materials provided with the |
| 950 | distribution. |
| 951 | |
| 952 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 953 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 954 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 955 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 956 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 957 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 958 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 959 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 960 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 961 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 962 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 963 | |
| 964 | You can contact the author at : |
| 965 | - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 966 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 967 | ****************************************************************** */ |
| 968 | |
| 969 | #ifndef FSE_COMMONDEFS_ONLY |
| 970 | |
| 971 | /**************************************************************** |
| 972 | * Tuning parameters |
| 973 | ****************************************************************/ |
| 974 | /* MEMORY_USAGE : |
| 975 | * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) |
| 976 | * Increasing memory usage improves compression ratio |
| 977 | * Reduced memory usage can improve speed, due to cache effect |
| 978 | * Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ |
| 979 | #define FSE_MAX_MEMORY_USAGE 14 |
| 980 | #define FSE_DEFAULT_MEMORY_USAGE 13 |
| 981 | |
| 982 | /* FSE_MAX_SYMBOL_VALUE : |
| 983 | * Maximum symbol value authorized. |
| 984 | * Required for proper stack allocation */ |
| 985 | #define FSE_MAX_SYMBOL_VALUE 255 |
| 986 | |
| 987 | |
| 988 | /**************************************************************** |
| 989 | * template functions type & suffix |
| 990 | ****************************************************************/ |
| 991 | #define FSE_FUNCTION_TYPE BYTE |
| 992 | #define FSE_FUNCTION_EXTENSION |
| 993 | |
| 994 | |
| 995 | /**************************************************************** |
| 996 | * Byte symbol type |
| 997 | ****************************************************************/ |
| 998 | #endif /* !FSE_COMMONDEFS_ONLY */ |
| 999 | |
| 1000 | |
| 1001 | /**************************************************************** |
| 1002 | * Compiler specifics |
| 1003 | ****************************************************************/ |
| 1004 | #ifdef _MSC_VER /* Visual Studio */ |
| 1005 | # define FORCE_INLINE static __forceinline |
| 1006 | # include <intrin.h> /* For Visual 2005 */ |
| 1007 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 1008 | # pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ |
| 1009 | #else |
| 1010 | # if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ |
| 1011 | # ifdef __GNUC__ |
| 1012 | # define FORCE_INLINE static inline __attribute__((always_inline)) |
| 1013 | # else |
| 1014 | # define FORCE_INLINE static inline |
| 1015 | # endif |
| 1016 | # else |
| 1017 | # define FORCE_INLINE static |
| 1018 | # endif /* __STDC_VERSION__ */ |
| 1019 | #endif |
| 1020 | |
| 1021 | |
| 1022 | /**************************************************************** |
| 1023 | * Includes |
| 1024 | ****************************************************************/ |
| 1025 | #include <stdlib.h> /* malloc, free, qsort */ |
| 1026 | #include <string.h> /* memcpy, memset */ |
| 1027 | #include <stdio.h> /* printf (debug) */ |
| 1028 | |
| 1029 | /**************************************************************** |
| 1030 | * Constants |
| 1031 | *****************************************************************/ |
| 1032 | #define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2) |
| 1033 | #define FSE_MAX_TABLESIZE (1U<<FSE_MAX_TABLELOG) |
| 1034 | #define FSE_MAXTABLESIZE_MASK (FSE_MAX_TABLESIZE-1) |
| 1035 | #define FSE_DEFAULT_TABLELOG (FSE_DEFAULT_MEMORY_USAGE-2) |
| 1036 | #define FSE_MIN_TABLELOG 5 |
| 1037 | |
| 1038 | #define FSE_TABLELOG_ABSOLUTE_MAX 15 |
| 1039 | #if FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX |
| 1040 | #error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported" |
| 1041 | #endif |
| 1042 | |
| 1043 | |
| 1044 | /**************************************************************** |
| 1045 | * Error Management |
| 1046 | ****************************************************************/ |
| 1047 | #define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ |
| 1048 | |
| 1049 | |
| 1050 | /**************************************************************** |
| 1051 | * Complex types |
| 1052 | ****************************************************************/ |
| 1053 | typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)]; |
| 1054 | |
| 1055 | |
| 1056 | /**************************************************************** |
| 1057 | * Templates |
| 1058 | ****************************************************************/ |
| 1059 | /* |
| 1060 | designed to be included |
| 1061 | for type-specific functions (template emulation in C) |
| 1062 | Objective is to write these functions only once, for improved maintenance |
| 1063 | */ |
| 1064 | |
| 1065 | /* safety checks */ |
| 1066 | #ifndef FSE_FUNCTION_EXTENSION |
| 1067 | # error "FSE_FUNCTION_EXTENSION must be defined" |
| 1068 | #endif |
| 1069 | #ifndef FSE_FUNCTION_TYPE |
| 1070 | # error "FSE_FUNCTION_TYPE must be defined" |
| 1071 | #endif |
| 1072 | |
| 1073 | /* Function names */ |
| 1074 | #define FSE_CAT(X,Y) X##Y |
| 1075 | #define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y) |
| 1076 | #define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y) |
| 1077 | |
| 1078 | |
| 1079 | /* Function templates */ |
| 1080 | |
| 1081 | #define FSE_DECODE_TYPE FSE_decode_t |
| 1082 | |
| 1083 | static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; } |
| 1084 | |
| 1085 | static size_t FSE_buildDTable |
| 1086 | (FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) |
| 1087 | { |
| 1088 | void* ptr = dt+1; |
| 1089 | FSE_DTableHeader DTableH; |
| 1090 | FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)ptr; |
| 1091 | const U32 tableSize = 1 << tableLog; |
| 1092 | const U32 tableMask = tableSize-1; |
| 1093 | const U32 step = FSE_tableStep(tableSize); |
| 1094 | U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1]; |
| 1095 | U32 position = 0; |
| 1096 | U32 highThreshold = tableSize-1; |
| 1097 | const S16 largeLimit= (S16)(1 << (tableLog-1)); |
| 1098 | U32 noLarge = 1; |
| 1099 | U32 s; |
| 1100 | |
| 1101 | /* Sanity Checks */ |
| 1102 | if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); |
| 1103 | if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); |
| 1104 | |
| 1105 | /* Init, lay down lowprob symbols */ |
| 1106 | DTableH.tableLog = (U16)tableLog; |
| 1107 | for (s=0; s<=maxSymbolValue; s++) |
| 1108 | { |
| 1109 | if (normalizedCounter[s]==-1) |
| 1110 | { |
| 1111 | tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s; |
| 1112 | symbolNext[s] = 1; |
| 1113 | } |
| 1114 | else |
| 1115 | { |
| 1116 | if (normalizedCounter[s] >= largeLimit) noLarge=0; |
| 1117 | symbolNext[s] = normalizedCounter[s]; |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /* Spread symbols */ |
| 1122 | for (s=0; s<=maxSymbolValue; s++) |
| 1123 | { |
| 1124 | int i; |
| 1125 | for (i=0; i<normalizedCounter[s]; i++) |
| 1126 | { |
| 1127 | tableDecode[position].symbol = (FSE_FUNCTION_TYPE)s; |
| 1128 | position = (position + step) & tableMask; |
| 1129 | while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */ |
| 1130 | } |
| 1131 | } |
| 1132 | |
| 1133 | if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ |
| 1134 | |
| 1135 | /* Build Decoding table */ |
| 1136 | { |
| 1137 | U32 i; |
| 1138 | for (i=0; i<tableSize; i++) |
| 1139 | { |
| 1140 | FSE_FUNCTION_TYPE symbol = (FSE_FUNCTION_TYPE)(tableDecode[i].symbol); |
| 1141 | U16 nextState = symbolNext[symbol]++; |
| 1142 | tableDecode[i].nbBits = (BYTE) (tableLog - BIT_highbit32 ((U32)nextState) ); |
| 1143 | tableDecode[i].newState = (U16) ( (nextState << tableDecode[i].nbBits) - tableSize); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | DTableH.fastMode = (U16)noLarge; |
| 1148 | memcpy(dt, &DTableH, sizeof(DTableH)); |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | |
| 1153 | #ifndef FSE_COMMONDEFS_ONLY |
| 1154 | /****************************************** |
| 1155 | * FSE helper functions |
| 1156 | ******************************************/ |
| 1157 | static unsigned FSE_isError(size_t code) { return ERR_isError(code); } |
| 1158 | |
| 1159 | |
| 1160 | /**************************************************************** |
| 1161 | * FSE NCount encoding-decoding |
| 1162 | ****************************************************************/ |
| 1163 | static short FSE_abs(short a) |
| 1164 | { |
| 1165 | return a<0 ? -a : a; |
| 1166 | } |
| 1167 | |
| 1168 | static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, |
| 1169 | const void* headerBuffer, size_t hbSize) |
| 1170 | { |
| 1171 | const BYTE* const istart = (const BYTE*) headerBuffer; |
| 1172 | const BYTE* const iend = istart + hbSize; |
| 1173 | const BYTE* ip = istart; |
| 1174 | int nbBits; |
| 1175 | int remaining; |
| 1176 | int threshold; |
| 1177 | U32 bitStream; |
| 1178 | int bitCount; |
| 1179 | unsigned charnum = 0; |
| 1180 | int previous0 = 0; |
| 1181 | |
| 1182 | if (hbSize < 4) return ERROR(srcSize_wrong); |
| 1183 | bitStream = MEM_readLE32(ip); |
| 1184 | nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */ |
| 1185 | if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); |
| 1186 | bitStream >>= 4; |
| 1187 | bitCount = 4; |
| 1188 | *tableLogPtr = nbBits; |
| 1189 | remaining = (1<<nbBits)+1; |
| 1190 | threshold = 1<<nbBits; |
| 1191 | nbBits++; |
| 1192 | |
| 1193 | while ((remaining>1) && (charnum<=*maxSVPtr)) |
| 1194 | { |
| 1195 | if (previous0) |
| 1196 | { |
| 1197 | unsigned n0 = charnum; |
| 1198 | while ((bitStream & 0xFFFF) == 0xFFFF) |
| 1199 | { |
| 1200 | n0+=24; |
| 1201 | if (ip < iend-5) |
| 1202 | { |
| 1203 | ip+=2; |
| 1204 | bitStream = MEM_readLE32(ip) >> bitCount; |
| 1205 | } |
| 1206 | else |
| 1207 | { |
| 1208 | bitStream >>= 16; |
| 1209 | bitCount+=16; |
| 1210 | } |
| 1211 | } |
| 1212 | while ((bitStream & 3) == 3) |
| 1213 | { |
| 1214 | n0+=3; |
| 1215 | bitStream>>=2; |
| 1216 | bitCount+=2; |
| 1217 | } |
| 1218 | n0 += bitStream & 3; |
| 1219 | bitCount += 2; |
| 1220 | if (n0 > *maxSVPtr) return ERROR(maxSymbolValue_tooSmall); |
| 1221 | while (charnum < n0) normalizedCounter[charnum++] = 0; |
| 1222 | if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) |
| 1223 | { |
| 1224 | ip += bitCount>>3; |
| 1225 | bitCount &= 7; |
| 1226 | bitStream = MEM_readLE32(ip) >> bitCount; |
| 1227 | } |
| 1228 | else |
| 1229 | bitStream >>= 2; |
| 1230 | } |
| 1231 | { |
| 1232 | const short max = (short)((2*threshold-1)-remaining); |
| 1233 | short count; |
| 1234 | |
| 1235 | if ((bitStream & (threshold-1)) < (U32)max) |
| 1236 | { |
| 1237 | count = (short)(bitStream & (threshold-1)); |
| 1238 | bitCount += nbBits-1; |
| 1239 | } |
| 1240 | else |
| 1241 | { |
| 1242 | count = (short)(bitStream & (2*threshold-1)); |
| 1243 | if (count >= threshold) count -= max; |
| 1244 | bitCount += nbBits; |
| 1245 | } |
| 1246 | |
| 1247 | count--; /* extra accuracy */ |
| 1248 | remaining -= FSE_abs(count); |
| 1249 | normalizedCounter[charnum++] = count; |
| 1250 | previous0 = !count; |
| 1251 | while (remaining < threshold) |
| 1252 | { |
| 1253 | nbBits--; |
| 1254 | threshold >>= 1; |
| 1255 | } |
| 1256 | |
| 1257 | { |
| 1258 | if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) |
| 1259 | { |
| 1260 | ip += bitCount>>3; |
| 1261 | bitCount &= 7; |
| 1262 | } |
| 1263 | else |
| 1264 | { |
| 1265 | bitCount -= (int)(8 * (iend - 4 - ip)); |
| 1266 | ip = iend - 4; |
| 1267 | } |
| 1268 | bitStream = MEM_readLE32(ip) >> (bitCount & 31); |
| 1269 | } |
| 1270 | } |
| 1271 | } |
| 1272 | if (remaining != 1) return ERROR(GENERIC); |
| 1273 | *maxSVPtr = charnum-1; |
| 1274 | |
| 1275 | ip += (bitCount+7)>>3; |
| 1276 | if ((size_t)(ip-istart) > hbSize) return ERROR(srcSize_wrong); |
| 1277 | return ip-istart; |
| 1278 | } |
| 1279 | |
| 1280 | |
| 1281 | /********************************************************* |
| 1282 | * Decompression (Byte symbols) |
| 1283 | *********************************************************/ |
| 1284 | static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue) |
| 1285 | { |
| 1286 | void* ptr = dt; |
| 1287 | FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; |
| 1288 | FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; |
| 1289 | |
| 1290 | DTableH->tableLog = 0; |
| 1291 | DTableH->fastMode = 0; |
| 1292 | |
| 1293 | cell->newState = 0; |
| 1294 | cell->symbol = symbolValue; |
| 1295 | cell->nbBits = 0; |
| 1296 | |
| 1297 | return 0; |
| 1298 | } |
| 1299 | |
| 1300 | |
| 1301 | static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits) |
| 1302 | { |
| 1303 | void* ptr = dt; |
| 1304 | FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr; |
| 1305 | FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; |
| 1306 | const unsigned tableSize = 1 << nbBits; |
| 1307 | const unsigned tableMask = tableSize - 1; |
| 1308 | const unsigned maxSymbolValue = tableMask; |
| 1309 | unsigned s; |
| 1310 | |
| 1311 | /* Sanity checks */ |
| 1312 | if (nbBits < 1) return ERROR(GENERIC); /* min size */ |
| 1313 | |
| 1314 | /* Build Decoding Table */ |
| 1315 | DTableH->tableLog = (U16)nbBits; |
| 1316 | DTableH->fastMode = 1; |
| 1317 | for (s=0; s<=maxSymbolValue; s++) |
| 1318 | { |
| 1319 | dinfo[s].newState = 0; |
| 1320 | dinfo[s].symbol = (BYTE)s; |
| 1321 | dinfo[s].nbBits = (BYTE)nbBits; |
| 1322 | } |
| 1323 | |
| 1324 | return 0; |
| 1325 | } |
| 1326 | |
| 1327 | FORCE_INLINE size_t FSE_decompress_usingDTable_generic( |
| 1328 | void* dst, size_t maxDstSize, |
| 1329 | const void* cSrc, size_t cSrcSize, |
| 1330 | const FSE_DTable* dt, const unsigned fast) |
| 1331 | { |
| 1332 | BYTE* const ostart = (BYTE*) dst; |
| 1333 | BYTE* op = ostart; |
| 1334 | BYTE* const omax = op + maxDstSize; |
| 1335 | BYTE* const olimit = omax-3; |
| 1336 | |
| 1337 | BIT_DStream_t bitD; |
| 1338 | FSE_DState_t state1; |
| 1339 | FSE_DState_t state2; |
| 1340 | size_t errorCode; |
| 1341 | |
| 1342 | /* Init */ |
| 1343 | errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */ |
| 1344 | if (FSE_isError(errorCode)) return errorCode; |
| 1345 | |
| 1346 | FSE_initDState(&state1, &bitD, dt); |
| 1347 | FSE_initDState(&state2, &bitD, dt); |
| 1348 | |
| 1349 | #define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD) |
| 1350 | |
| 1351 | /* 4 symbols per loop */ |
| 1352 | for ( ; (BIT_reloadDStream(&bitD)==BIT_DStream_unfinished) && (op<olimit) ; op+=4) |
| 1353 | { |
| 1354 | op[0] = FSE_GETSYMBOL(&state1); |
| 1355 | |
| 1356 | if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1357 | BIT_reloadDStream(&bitD); |
| 1358 | |
| 1359 | op[1] = FSE_GETSYMBOL(&state2); |
| 1360 | |
| 1361 | if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1362 | { if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) { op+=2; break; } } |
| 1363 | |
| 1364 | op[2] = FSE_GETSYMBOL(&state1); |
| 1365 | |
| 1366 | if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ |
| 1367 | BIT_reloadDStream(&bitD); |
| 1368 | |
| 1369 | op[3] = FSE_GETSYMBOL(&state2); |
| 1370 | } |
| 1371 | |
| 1372 | /* tail */ |
| 1373 | /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */ |
| 1374 | while (1) |
| 1375 | { |
| 1376 | if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) ) |
| 1377 | break; |
| 1378 | |
| 1379 | *op++ = FSE_GETSYMBOL(&state1); |
| 1380 | |
| 1381 | if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) ) |
| 1382 | break; |
| 1383 | |
| 1384 | *op++ = FSE_GETSYMBOL(&state2); |
| 1385 | } |
| 1386 | |
| 1387 | /* end ? */ |
| 1388 | if (BIT_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2)) |
| 1389 | return op-ostart; |
| 1390 | |
| 1391 | if (op==omax) return ERROR(dstSize_tooSmall); /* dst buffer is full, but cSrc unfinished */ |
| 1392 | |
| 1393 | return ERROR(corruption_detected); |
| 1394 | } |
| 1395 | |
| 1396 | |
| 1397 | static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize, |
| 1398 | const void* cSrc, size_t cSrcSize, |
| 1399 | const FSE_DTable* dt) |
| 1400 | { |
| 1401 | FSE_DTableHeader DTableH; |
| 1402 | memcpy(&DTableH, dt, sizeof(DTableH)); |
| 1403 | |
| 1404 | /* select fast mode (static) */ |
| 1405 | if (DTableH.fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); |
| 1406 | return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); |
| 1407 | } |
| 1408 | |
| 1409 | |
| 1410 | static size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) |
| 1411 | { |
| 1412 | const BYTE* const istart = (const BYTE*)cSrc; |
| 1413 | const BYTE* ip = istart; |
| 1414 | short counting[FSE_MAX_SYMBOL_VALUE+1]; |
| 1415 | DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ |
| 1416 | unsigned tableLog; |
| 1417 | unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE; |
| 1418 | size_t errorCode; |
| 1419 | |
| 1420 | if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */ |
| 1421 | |
| 1422 | /* normal FSE decoding mode */ |
| 1423 | errorCode = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); |
| 1424 | if (FSE_isError(errorCode)) return errorCode; |
| 1425 | if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */ |
| 1426 | ip += errorCode; |
| 1427 | cSrcSize -= errorCode; |
| 1428 | |
| 1429 | errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog); |
| 1430 | if (FSE_isError(errorCode)) return errorCode; |
| 1431 | |
| 1432 | /* always return, even if it is an error code */ |
| 1433 | return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); |
| 1434 | } |
| 1435 | |
| 1436 | |
| 1437 | |
| 1438 | #endif /* FSE_COMMONDEFS_ONLY */ |
| 1439 | /* ****************************************************************** |
| 1440 | Huff0 : Huffman coder, part of New Generation Entropy library |
| 1441 | Copyright (C) 2013-2015, Yann Collet. |
| 1442 | |
| 1443 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 1444 | |
| 1445 | Redistribution and use in source and binary forms, with or without |
| 1446 | modification, are permitted provided that the following conditions are |
| 1447 | met: |
| 1448 | |
| 1449 | * Redistributions of source code must retain the above copyright |
| 1450 | notice, this list of conditions and the following disclaimer. |
| 1451 | * Redistributions in binary form must reproduce the above |
| 1452 | copyright notice, this list of conditions and the following disclaimer |
| 1453 | in the documentation and/or other materials provided with the |
| 1454 | distribution. |
| 1455 | |
| 1456 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 1457 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 1458 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 1459 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 1460 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 1461 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 1462 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 1463 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 1464 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 1465 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 1466 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 1467 | |
| 1468 | You can contact the author at : |
| 1469 | - FSE+Huff0 source repository : https://github.com/Cyan4973/FiniteStateEntropy |
| 1470 | - Public forum : https://groups.google.com/forum/#!forum/lz4c |
| 1471 | ****************************************************************** */ |
| 1472 | |
| 1473 | /**************************************************************** |
| 1474 | * Compiler specifics |
| 1475 | ****************************************************************/ |
| 1476 | #if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) |
| 1477 | /* inline is defined */ |
| 1478 | #elif defined(_MSC_VER) |
| 1479 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 1480 | # define inline __inline |
| 1481 | #else |
| 1482 | # define inline /* disable inline */ |
| 1483 | #endif |
| 1484 | |
| 1485 | |
| 1486 | /**************************************************************** |
| 1487 | * Includes |
| 1488 | ****************************************************************/ |
| 1489 | #include <stdlib.h> /* malloc, free, qsort */ |
| 1490 | #include <string.h> /* memcpy, memset */ |
| 1491 | #include <stdio.h> /* printf (debug) */ |
| 1492 | |
| 1493 | /**************************************************************** |
| 1494 | * Error Management |
| 1495 | ****************************************************************/ |
| 1496 | #define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ |
| 1497 | |
| 1498 | |
| 1499 | /****************************************** |
| 1500 | * Helper functions |
| 1501 | ******************************************/ |
| 1502 | static unsigned HUF_isError(size_t code) { return ERR_isError(code); } |
| 1503 | |
| 1504 | #define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */ |
| 1505 | #define HUF_MAX_TABLELOG 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */ |
| 1506 | #define HUF_DEFAULT_TABLELOG HUF_MAX_TABLELOG /* tableLog by default, when not specified */ |
| 1507 | #define HUF_MAX_SYMBOL_VALUE 255 |
| 1508 | #if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG) |
| 1509 | # error "HUF_MAX_TABLELOG is too large !" |
| 1510 | #endif |
| 1511 | |
| 1512 | |
| 1513 | |
| 1514 | /********************************************************* |
| 1515 | * Huff0 : Huffman block decompression |
| 1516 | *********************************************************/ |
| 1517 | typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */ |
| 1518 | |
| 1519 | typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */ |
| 1520 | |
| 1521 | typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; |
| 1522 | |
| 1523 | /*! HUF_readStats |
| 1524 | Read compact Huffman tree, saved by HUF_writeCTable |
| 1525 | @huffWeight : destination buffer |
| 1526 | @return : size read from `src` |
| 1527 | */ |
| 1528 | static size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, |
| 1529 | U32* nbSymbolsPtr, U32* tableLogPtr, |
| 1530 | const void* src, size_t srcSize) |
| 1531 | { |
| 1532 | U32 weightTotal; |
| 1533 | U32 tableLog; |
| 1534 | const BYTE* ip = (const BYTE*) src; |
| 1535 | size_t iSize; |
| 1536 | size_t oSize; |
| 1537 | U32 n; |
| 1538 | |
| 1539 | if (!srcSize) return ERROR(srcSize_wrong); |
| 1540 | iSize = ip[0]; |
| 1541 | //memset(huffWeight, 0, hwSize); /* is not necessary, even though some analyzer complain ... */ |
| 1542 | |
| 1543 | if (iSize >= 128) /* special header */ |
| 1544 | { |
| 1545 | if (iSize >= (242)) /* RLE */ |
| 1546 | { |
| 1547 | static int l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; |
| 1548 | oSize = l[iSize-242]; |
| 1549 | memset(huffWeight, 1, hwSize); |
| 1550 | iSize = 0; |
| 1551 | } |
| 1552 | else /* Incompressible */ |
| 1553 | { |
| 1554 | oSize = iSize - 127; |
| 1555 | iSize = ((oSize+1)/2); |
| 1556 | if (iSize+1 > srcSize) return ERROR(srcSize_wrong); |
| 1557 | if (oSize >= hwSize) return ERROR(corruption_detected); |
| 1558 | ip += 1; |
| 1559 | for (n=0; n<oSize; n+=2) |
| 1560 | { |
| 1561 | huffWeight[n] = ip[n/2] >> 4; |
| 1562 | huffWeight[n+1] = ip[n/2] & 15; |
| 1563 | } |
| 1564 | } |
| 1565 | } |
| 1566 | else /* header compressed with FSE (normal case) */ |
| 1567 | { |
| 1568 | if (iSize+1 > srcSize) return ERROR(srcSize_wrong); |
| 1569 | oSize = FSE_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */ |
| 1570 | if (FSE_isError(oSize)) return oSize; |
| 1571 | } |
| 1572 | |
| 1573 | /* collect weight stats */ |
| 1574 | memset(rankStats, 0, (HUF_ABSOLUTEMAX_TABLELOG + 1) * sizeof(U32)); |
| 1575 | weightTotal = 0; |
| 1576 | for (n=0; n<oSize; n++) |
| 1577 | { |
| 1578 | if (huffWeight[n] >= HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); |
| 1579 | rankStats[huffWeight[n]]++; |
| 1580 | weightTotal += (1 << huffWeight[n]) >> 1; |
| 1581 | } |
| 1582 | if (weightTotal == 0) return ERROR(corruption_detected); |
| 1583 | |
| 1584 | /* get last non-null symbol weight (implied, total must be 2^n) */ |
| 1585 | tableLog = BIT_highbit32(weightTotal) + 1; |
| 1586 | if (tableLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); |
| 1587 | { |
| 1588 | U32 total = 1 << tableLog; |
| 1589 | U32 rest = total - weightTotal; |
| 1590 | U32 verif = 1 << BIT_highbit32(rest); |
| 1591 | U32 lastWeight = BIT_highbit32(rest) + 1; |
| 1592 | if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ |
| 1593 | huffWeight[oSize] = (BYTE)lastWeight; |
| 1594 | rankStats[lastWeight]++; |
| 1595 | } |
| 1596 | |
| 1597 | /* check tree construction validity */ |
| 1598 | if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ |
| 1599 | |
| 1600 | /* results */ |
| 1601 | *nbSymbolsPtr = (U32)(oSize+1); |
| 1602 | *tableLogPtr = tableLog; |
| 1603 | return iSize+1; |
| 1604 | } |
| 1605 | |
| 1606 | |
| 1607 | /**************************/ |
| 1608 | /* single-symbol decoding */ |
| 1609 | /**************************/ |
| 1610 | |
| 1611 | static size_t HUF_readDTableX2 (U16* DTable, const void* src, size_t srcSize) |
| 1612 | { |
| 1613 | BYTE huffWeight[HUF_MAX_SYMBOL_VALUE + 1]; |
| 1614 | U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; /* large enough for values from 0 to 16 */ |
| 1615 | U32 tableLog = 0; |
| 1616 | const BYTE* ip = (const BYTE*) src; |
| 1617 | size_t iSize = ip[0]; |
| 1618 | U32 nbSymbols = 0; |
| 1619 | U32 n; |
| 1620 | U32 nextRankStart; |
| 1621 | void* ptr = DTable+1; |
| 1622 | HUF_DEltX2* const dt = (HUF_DEltX2*)(ptr); |
| 1623 | |
| 1624 | HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */ |
| 1625 | //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */ |
| 1626 | |
| 1627 | iSize = HUF_readStats(huffWeight, HUF_MAX_SYMBOL_VALUE + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); |
| 1628 | if (HUF_isError(iSize)) return iSize; |
| 1629 | |
| 1630 | /* check result */ |
| 1631 | if (tableLog > DTable[0]) return ERROR(tableLog_tooLarge); /* DTable is too small */ |
| 1632 | DTable[0] = (U16)tableLog; /* maybe should separate sizeof DTable, as allocated, from used size of DTable, in case of DTable re-use */ |
| 1633 | |
| 1634 | /* Prepare ranks */ |
| 1635 | nextRankStart = 0; |
| 1636 | for (n=1; n<=tableLog; n++) |
| 1637 | { |
| 1638 | U32 current = nextRankStart; |
| 1639 | nextRankStart += (rankVal[n] << (n-1)); |
| 1640 | rankVal[n] = current; |
| 1641 | } |
| 1642 | |
| 1643 | /* fill DTable */ |
| 1644 | for (n=0; n<nbSymbols; n++) |
| 1645 | { |
| 1646 | const U32 w = huffWeight[n]; |
| 1647 | const U32 length = (1 << w) >> 1; |
| 1648 | U32 i; |
| 1649 | HUF_DEltX2 D; |
| 1650 | D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); |
| 1651 | for (i = rankVal[w]; i < rankVal[w] + length; i++) |
| 1652 | dt[i] = D; |
| 1653 | rankVal[w] += length; |
| 1654 | } |
| 1655 | |
| 1656 | return iSize; |
| 1657 | } |
| 1658 | |
| 1659 | static BYTE HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog) |
| 1660 | { |
| 1661 | const size_t val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ |
| 1662 | const BYTE c = dt[val].byte; |
| 1663 | BIT_skipBits(Dstream, dt[val].nbBits); |
| 1664 | return c; |
| 1665 | } |
| 1666 | |
| 1667 | #define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ |
| 1668 | *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog) |
| 1669 | |
| 1670 | #define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ |
| 1671 | if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \ |
| 1672 | HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
| 1673 | |
| 1674 | #define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ |
| 1675 | if (MEM_64bits()) \ |
| 1676 | HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) |
| 1677 | |
| 1678 | static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog) |
| 1679 | { |
| 1680 | BYTE* const pStart = p; |
| 1681 | |
| 1682 | /* up to 4 symbols at a time */ |
| 1683 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4)) |
| 1684 | { |
| 1685 | HUF_DECODE_SYMBOLX2_2(p, bitDPtr); |
| 1686 | HUF_DECODE_SYMBOLX2_1(p, bitDPtr); |
| 1687 | HUF_DECODE_SYMBOLX2_2(p, bitDPtr); |
| 1688 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1689 | } |
| 1690 | |
| 1691 | /* closer to the end */ |
| 1692 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd)) |
| 1693 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1694 | |
| 1695 | /* no more data to retrieve from bitstream, hence no need to reload */ |
| 1696 | while (p < pEnd) |
| 1697 | HUF_DECODE_SYMBOLX2_0(p, bitDPtr); |
| 1698 | |
| 1699 | return pEnd-pStart; |
| 1700 | } |
| 1701 | |
| 1702 | |
| 1703 | static size_t HUF_decompress4X2_usingDTable( |
| 1704 | void* dst, size_t dstSize, |
| 1705 | const void* cSrc, size_t cSrcSize, |
| 1706 | const U16* DTable) |
| 1707 | { |
| 1708 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
| 1709 | |
| 1710 | { |
| 1711 | const BYTE* const istart = (const BYTE*) cSrc; |
| 1712 | BYTE* const ostart = (BYTE*) dst; |
| 1713 | BYTE* const oend = ostart + dstSize; |
| 1714 | |
| 1715 | const void* ptr = DTable; |
| 1716 | const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1; |
| 1717 | const U32 dtLog = DTable[0]; |
| 1718 | size_t errorCode; |
| 1719 | |
| 1720 | /* Init */ |
| 1721 | BIT_DStream_t bitD1; |
| 1722 | BIT_DStream_t bitD2; |
| 1723 | BIT_DStream_t bitD3; |
| 1724 | BIT_DStream_t bitD4; |
| 1725 | const size_t length1 = MEM_readLE16(istart); |
| 1726 | const size_t length2 = MEM_readLE16(istart+2); |
| 1727 | const size_t length3 = MEM_readLE16(istart+4); |
| 1728 | size_t length4; |
| 1729 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
| 1730 | const BYTE* const istart2 = istart1 + length1; |
| 1731 | const BYTE* const istart3 = istart2 + length2; |
| 1732 | const BYTE* const istart4 = istart3 + length3; |
| 1733 | const size_t segmentSize = (dstSize+3) / 4; |
| 1734 | BYTE* const opStart2 = ostart + segmentSize; |
| 1735 | BYTE* const opStart3 = opStart2 + segmentSize; |
| 1736 | BYTE* const opStart4 = opStart3 + segmentSize; |
| 1737 | BYTE* op1 = ostart; |
| 1738 | BYTE* op2 = opStart2; |
| 1739 | BYTE* op3 = opStart3; |
| 1740 | BYTE* op4 = opStart4; |
| 1741 | U32 endSignal; |
| 1742 | |
| 1743 | length4 = cSrcSize - (length1 + length2 + length3 + 6); |
| 1744 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
| 1745 | errorCode = BIT_initDStream(&bitD1, istart1, length1); |
| 1746 | if (HUF_isError(errorCode)) return errorCode; |
| 1747 | errorCode = BIT_initDStream(&bitD2, istart2, length2); |
| 1748 | if (HUF_isError(errorCode)) return errorCode; |
| 1749 | errorCode = BIT_initDStream(&bitD3, istart3, length3); |
| 1750 | if (HUF_isError(errorCode)) return errorCode; |
| 1751 | errorCode = BIT_initDStream(&bitD4, istart4, length4); |
| 1752 | if (HUF_isError(errorCode)) return errorCode; |
| 1753 | |
| 1754 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
| 1755 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
| 1756 | for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) |
| 1757 | { |
| 1758 | HUF_DECODE_SYMBOLX2_2(op1, &bitD1); |
| 1759 | HUF_DECODE_SYMBOLX2_2(op2, &bitD2); |
| 1760 | HUF_DECODE_SYMBOLX2_2(op3, &bitD3); |
| 1761 | HUF_DECODE_SYMBOLX2_2(op4, &bitD4); |
| 1762 | HUF_DECODE_SYMBOLX2_1(op1, &bitD1); |
| 1763 | HUF_DECODE_SYMBOLX2_1(op2, &bitD2); |
| 1764 | HUF_DECODE_SYMBOLX2_1(op3, &bitD3); |
| 1765 | HUF_DECODE_SYMBOLX2_1(op4, &bitD4); |
| 1766 | HUF_DECODE_SYMBOLX2_2(op1, &bitD1); |
| 1767 | HUF_DECODE_SYMBOLX2_2(op2, &bitD2); |
| 1768 | HUF_DECODE_SYMBOLX2_2(op3, &bitD3); |
| 1769 | HUF_DECODE_SYMBOLX2_2(op4, &bitD4); |
| 1770 | HUF_DECODE_SYMBOLX2_0(op1, &bitD1); |
| 1771 | HUF_DECODE_SYMBOLX2_0(op2, &bitD2); |
| 1772 | HUF_DECODE_SYMBOLX2_0(op3, &bitD3); |
| 1773 | HUF_DECODE_SYMBOLX2_0(op4, &bitD4); |
| 1774 | |
| 1775 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
| 1776 | } |
| 1777 | |
| 1778 | /* check corruption */ |
| 1779 | if (op1 > opStart2) return ERROR(corruption_detected); |
| 1780 | if (op2 > opStart3) return ERROR(corruption_detected); |
| 1781 | if (op3 > opStart4) return ERROR(corruption_detected); |
| 1782 | /* note : op4 supposed already verified within main loop */ |
| 1783 | |
| 1784 | /* finish bitStreams one by one */ |
| 1785 | HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); |
| 1786 | HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); |
| 1787 | HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); |
| 1788 | HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); |
| 1789 | |
| 1790 | /* check */ |
| 1791 | endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); |
| 1792 | if (!endSignal) return ERROR(corruption_detected); |
| 1793 | |
| 1794 | /* decoded size */ |
| 1795 | return dstSize; |
| 1796 | } |
| 1797 | } |
| 1798 | |
| 1799 | |
| 1800 | static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 1801 | { |
| 1802 | HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_MAX_TABLELOG); |
| 1803 | const BYTE* ip = (const BYTE*) cSrc; |
| 1804 | size_t errorCode; |
| 1805 | |
| 1806 | errorCode = HUF_readDTableX2 (DTable, cSrc, cSrcSize); |
| 1807 | if (HUF_isError(errorCode)) return errorCode; |
| 1808 | if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); |
| 1809 | ip += errorCode; |
| 1810 | cSrcSize -= errorCode; |
| 1811 | |
| 1812 | return HUF_decompress4X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable); |
| 1813 | } |
| 1814 | |
| 1815 | |
| 1816 | /***************************/ |
| 1817 | /* double-symbols decoding */ |
| 1818 | /***************************/ |
| 1819 | |
| 1820 | static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed, |
| 1821 | const U32* rankValOrigin, const int minWeight, |
| 1822 | const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, |
| 1823 | U32 nbBitsBaseline, U16 baseSeq) |
| 1824 | { |
| 1825 | HUF_DEltX4 DElt; |
| 1826 | U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; |
| 1827 | U32 s; |
| 1828 | |
| 1829 | /* get pre-calculated rankVal */ |
| 1830 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
| 1831 | |
| 1832 | /* fill skipped values */ |
| 1833 | if (minWeight>1) |
| 1834 | { |
| 1835 | U32 i, skipSize = rankVal[minWeight]; |
| 1836 | MEM_writeLE16(&(DElt.sequence), baseSeq); |
| 1837 | DElt.nbBits = (BYTE)(consumed); |
| 1838 | DElt.length = 1; |
| 1839 | for (i = 0; i < skipSize; i++) |
| 1840 | DTable[i] = DElt; |
| 1841 | } |
| 1842 | |
| 1843 | /* fill DTable */ |
| 1844 | for (s=0; s<sortedListSize; s++) /* note : sortedSymbols already skipped */ |
| 1845 | { |
| 1846 | const U32 symbol = sortedSymbols[s].symbol; |
| 1847 | const U32 weight = sortedSymbols[s].weight; |
| 1848 | const U32 nbBits = nbBitsBaseline - weight; |
| 1849 | const U32 length = 1 << (sizeLog-nbBits); |
| 1850 | const U32 start = rankVal[weight]; |
| 1851 | U32 i = start; |
| 1852 | const U32 end = start + length; |
| 1853 | |
| 1854 | MEM_writeLE16(&(DElt.sequence), (U16)(baseSeq + (symbol << 8))); |
| 1855 | DElt.nbBits = (BYTE)(nbBits + consumed); |
| 1856 | DElt.length = 2; |
| 1857 | do { DTable[i++] = DElt; } while (i<end); /* since length >= 1 */ |
| 1858 | |
| 1859 | rankVal[weight] += length; |
| 1860 | } |
| 1861 | } |
| 1862 | |
| 1863 | typedef U32 rankVal_t[HUF_ABSOLUTEMAX_TABLELOG][HUF_ABSOLUTEMAX_TABLELOG + 1]; |
| 1864 | |
| 1865 | static void HUF_fillDTableX4(HUF_DEltX4* DTable, const U32 targetLog, |
| 1866 | const sortedSymbol_t* sortedList, const U32 sortedListSize, |
| 1867 | const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, |
| 1868 | const U32 nbBitsBaseline) |
| 1869 | { |
| 1870 | U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; |
| 1871 | const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ |
| 1872 | const U32 minBits = nbBitsBaseline - maxWeight; |
| 1873 | U32 s; |
| 1874 | |
| 1875 | memcpy(rankVal, rankValOrigin, sizeof(rankVal)); |
| 1876 | |
| 1877 | /* fill DTable */ |
| 1878 | for (s=0; s<sortedListSize; s++) |
| 1879 | { |
| 1880 | const U16 symbol = sortedList[s].symbol; |
| 1881 | const U32 weight = sortedList[s].weight; |
| 1882 | const U32 nbBits = nbBitsBaseline - weight; |
| 1883 | const U32 start = rankVal[weight]; |
| 1884 | const U32 length = 1 << (targetLog-nbBits); |
| 1885 | |
| 1886 | if (targetLog-nbBits >= minBits) /* enough room for a second symbol */ |
| 1887 | { |
| 1888 | U32 sortedRank; |
| 1889 | int minWeight = nbBits + scaleLog; |
| 1890 | if (minWeight < 1) minWeight = 1; |
| 1891 | sortedRank = rankStart[minWeight]; |
| 1892 | HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, |
| 1893 | rankValOrigin[nbBits], minWeight, |
| 1894 | sortedList+sortedRank, sortedListSize-sortedRank, |
| 1895 | nbBitsBaseline, symbol); |
| 1896 | } |
| 1897 | else |
| 1898 | { |
| 1899 | U32 i; |
| 1900 | const U32 end = start + length; |
| 1901 | HUF_DEltX4 DElt; |
| 1902 | |
| 1903 | MEM_writeLE16(&(DElt.sequence), symbol); |
| 1904 | DElt.nbBits = (BYTE)(nbBits); |
| 1905 | DElt.length = 1; |
| 1906 | for (i = start; i < end; i++) |
| 1907 | DTable[i] = DElt; |
| 1908 | } |
| 1909 | rankVal[weight] += length; |
| 1910 | } |
| 1911 | } |
| 1912 | |
| 1913 | static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize) |
| 1914 | { |
| 1915 | BYTE weightList[HUF_MAX_SYMBOL_VALUE + 1]; |
| 1916 | sortedSymbol_t sortedSymbol[HUF_MAX_SYMBOL_VALUE + 1]; |
| 1917 | U32 rankStats[HUF_ABSOLUTEMAX_TABLELOG + 1] = { 0 }; |
| 1918 | U32 rankStart0[HUF_ABSOLUTEMAX_TABLELOG + 2] = { 0 }; |
| 1919 | U32* const rankStart = rankStart0+1; |
| 1920 | rankVal_t rankVal; |
| 1921 | U32 tableLog, maxW, sizeOfSort, nbSymbols; |
| 1922 | const U32 memLog = DTable[0]; |
| 1923 | const BYTE* ip = (const BYTE*) src; |
| 1924 | size_t iSize = ip[0]; |
| 1925 | void* ptr = DTable; |
| 1926 | HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1; |
| 1927 | |
| 1928 | HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */ |
| 1929 | if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge); |
| 1930 | //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */ |
| 1931 | |
| 1932 | iSize = HUF_readStats(weightList, HUF_MAX_SYMBOL_VALUE + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); |
| 1933 | if (HUF_isError(iSize)) return iSize; |
| 1934 | |
| 1935 | /* check result */ |
| 1936 | if (tableLog > memLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ |
| 1937 | |
| 1938 | /* find maxWeight */ |
| 1939 | for (maxW = tableLog; rankStats[maxW]==0; maxW--) |
| 1940 | { if (!maxW) return ERROR(GENERIC); } /* necessarily finds a solution before maxW==0 */ |
| 1941 | |
| 1942 | /* Get start index of each weight */ |
| 1943 | { |
| 1944 | U32 w, nextRankStart = 0; |
| 1945 | for (w=1; w<=maxW; w++) |
| 1946 | { |
| 1947 | U32 current = nextRankStart; |
| 1948 | nextRankStart += rankStats[w]; |
| 1949 | rankStart[w] = current; |
| 1950 | } |
| 1951 | rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ |
| 1952 | sizeOfSort = nextRankStart; |
| 1953 | } |
| 1954 | |
| 1955 | /* sort symbols by weight */ |
| 1956 | { |
| 1957 | U32 s; |
| 1958 | for (s=0; s<nbSymbols; s++) |
| 1959 | { |
| 1960 | U32 w = weightList[s]; |
| 1961 | U32 r = rankStart[w]++; |
| 1962 | sortedSymbol[r].symbol = (BYTE)s; |
| 1963 | sortedSymbol[r].weight = (BYTE)w; |
| 1964 | } |
| 1965 | rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */ |
| 1966 | } |
| 1967 | |
| 1968 | /* Build rankVal */ |
| 1969 | { |
| 1970 | const U32 minBits = tableLog+1 - maxW; |
| 1971 | U32 nextRankVal = 0; |
| 1972 | U32 w, consumed; |
| 1973 | const int rescale = (memLog-tableLog) - 1; /* tableLog <= memLog */ |
| 1974 | U32* rankVal0 = rankVal[0]; |
| 1975 | for (w=1; w<=maxW; w++) |
| 1976 | { |
| 1977 | U32 current = nextRankVal; |
| 1978 | nextRankVal += rankStats[w] << (w+rescale); |
| 1979 | rankVal0[w] = current; |
| 1980 | } |
| 1981 | for (consumed = minBits; consumed <= memLog - minBits; consumed++) |
| 1982 | { |
| 1983 | U32* rankValPtr = rankVal[consumed]; |
| 1984 | for (w = 1; w <= maxW; w++) |
| 1985 | { |
| 1986 | rankValPtr[w] = rankVal0[w] >> consumed; |
| 1987 | } |
| 1988 | } |
| 1989 | } |
| 1990 | |
| 1991 | HUF_fillDTableX4(dt, memLog, |
| 1992 | sortedSymbol, sizeOfSort, |
| 1993 | rankStart0, rankVal, maxW, |
| 1994 | tableLog+1); |
| 1995 | |
| 1996 | return iSize; |
| 1997 | } |
| 1998 | |
| 1999 | |
| 2000 | static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) |
| 2001 | { |
| 2002 | const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
| 2003 | memcpy(op, dt+val, 2); |
| 2004 | BIT_skipBits(DStream, dt[val].nbBits); |
| 2005 | return dt[val].length; |
| 2006 | } |
| 2007 | |
| 2008 | static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog) |
| 2009 | { |
| 2010 | const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ |
| 2011 | memcpy(op, dt+val, 1); |
| 2012 | if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits); |
| 2013 | else |
| 2014 | { |
| 2015 | if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) |
| 2016 | { |
| 2017 | BIT_skipBits(DStream, dt[val].nbBits); |
| 2018 | if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) |
| 2019 | 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 */ |
| 2020 | } |
| 2021 | } |
| 2022 | return 1; |
| 2023 | } |
| 2024 | |
| 2025 | |
| 2026 | #define HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ |
| 2027 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2028 | |
| 2029 | #define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ |
| 2030 | if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \ |
| 2031 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2032 | |
| 2033 | #define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ |
| 2034 | if (MEM_64bits()) \ |
| 2035 | ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) |
| 2036 | |
| 2037 | static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog) |
| 2038 | { |
| 2039 | BYTE* const pStart = p; |
| 2040 | |
| 2041 | /* up to 8 symbols at a time */ |
| 2042 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7)) |
| 2043 | { |
| 2044 | HUF_DECODE_SYMBOLX4_2(p, bitDPtr); |
| 2045 | HUF_DECODE_SYMBOLX4_1(p, bitDPtr); |
| 2046 | HUF_DECODE_SYMBOLX4_2(p, bitDPtr); |
| 2047 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); |
| 2048 | } |
| 2049 | |
| 2050 | /* closer to the end */ |
| 2051 | while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2)) |
| 2052 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); |
| 2053 | |
| 2054 | while (p <= pEnd-2) |
| 2055 | HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ |
| 2056 | |
| 2057 | if (p < pEnd) |
| 2058 | p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); |
| 2059 | |
| 2060 | return p-pStart; |
| 2061 | } |
| 2062 | |
| 2063 | |
| 2064 | |
| 2065 | static size_t HUF_decompress4X4_usingDTable( |
| 2066 | void* dst, size_t dstSize, |
| 2067 | const void* cSrc, size_t cSrcSize, |
| 2068 | const U32* DTable) |
| 2069 | { |
| 2070 | if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ |
| 2071 | |
| 2072 | { |
| 2073 | const BYTE* const istart = (const BYTE*) cSrc; |
| 2074 | BYTE* const ostart = (BYTE*) dst; |
| 2075 | BYTE* const oend = ostart + dstSize; |
| 2076 | |
| 2077 | const void* ptr = DTable; |
| 2078 | const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1; |
| 2079 | const U32 dtLog = DTable[0]; |
| 2080 | size_t errorCode; |
| 2081 | |
| 2082 | /* Init */ |
| 2083 | BIT_DStream_t bitD1; |
| 2084 | BIT_DStream_t bitD2; |
| 2085 | BIT_DStream_t bitD3; |
| 2086 | BIT_DStream_t bitD4; |
| 2087 | const size_t length1 = MEM_readLE16(istart); |
| 2088 | const size_t length2 = MEM_readLE16(istart+2); |
| 2089 | const size_t length3 = MEM_readLE16(istart+4); |
| 2090 | size_t length4; |
| 2091 | const BYTE* const istart1 = istart + 6; /* jumpTable */ |
| 2092 | const BYTE* const istart2 = istart1 + length1; |
| 2093 | const BYTE* const istart3 = istart2 + length2; |
| 2094 | const BYTE* const istart4 = istart3 + length3; |
| 2095 | const size_t segmentSize = (dstSize+3) / 4; |
| 2096 | BYTE* const opStart2 = ostart + segmentSize; |
| 2097 | BYTE* const opStart3 = opStart2 + segmentSize; |
| 2098 | BYTE* const opStart4 = opStart3 + segmentSize; |
| 2099 | BYTE* op1 = ostart; |
| 2100 | BYTE* op2 = opStart2; |
| 2101 | BYTE* op3 = opStart3; |
| 2102 | BYTE* op4 = opStart4; |
| 2103 | U32 endSignal; |
| 2104 | |
| 2105 | length4 = cSrcSize - (length1 + length2 + length3 + 6); |
| 2106 | if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ |
| 2107 | errorCode = BIT_initDStream(&bitD1, istart1, length1); |
| 2108 | if (HUF_isError(errorCode)) return errorCode; |
| 2109 | errorCode = BIT_initDStream(&bitD2, istart2, length2); |
| 2110 | if (HUF_isError(errorCode)) return errorCode; |
| 2111 | errorCode = BIT_initDStream(&bitD3, istart3, length3); |
| 2112 | if (HUF_isError(errorCode)) return errorCode; |
| 2113 | errorCode = BIT_initDStream(&bitD4, istart4, length4); |
| 2114 | if (HUF_isError(errorCode)) return errorCode; |
| 2115 | |
| 2116 | /* 16-32 symbols per loop (4-8 symbols per stream) */ |
| 2117 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
| 2118 | for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; ) |
| 2119 | { |
| 2120 | HUF_DECODE_SYMBOLX4_2(op1, &bitD1); |
| 2121 | HUF_DECODE_SYMBOLX4_2(op2, &bitD2); |
| 2122 | HUF_DECODE_SYMBOLX4_2(op3, &bitD3); |
| 2123 | HUF_DECODE_SYMBOLX4_2(op4, &bitD4); |
| 2124 | HUF_DECODE_SYMBOLX4_1(op1, &bitD1); |
| 2125 | HUF_DECODE_SYMBOLX4_1(op2, &bitD2); |
| 2126 | HUF_DECODE_SYMBOLX4_1(op3, &bitD3); |
| 2127 | HUF_DECODE_SYMBOLX4_1(op4, &bitD4); |
| 2128 | HUF_DECODE_SYMBOLX4_2(op1, &bitD1); |
| 2129 | HUF_DECODE_SYMBOLX4_2(op2, &bitD2); |
| 2130 | HUF_DECODE_SYMBOLX4_2(op3, &bitD3); |
| 2131 | HUF_DECODE_SYMBOLX4_2(op4, &bitD4); |
| 2132 | HUF_DECODE_SYMBOLX4_0(op1, &bitD1); |
| 2133 | HUF_DECODE_SYMBOLX4_0(op2, &bitD2); |
| 2134 | HUF_DECODE_SYMBOLX4_0(op3, &bitD3); |
| 2135 | HUF_DECODE_SYMBOLX4_0(op4, &bitD4); |
| 2136 | |
| 2137 | endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4); |
| 2138 | } |
| 2139 | |
| 2140 | /* check corruption */ |
| 2141 | if (op1 > opStart2) return ERROR(corruption_detected); |
| 2142 | if (op2 > opStart3) return ERROR(corruption_detected); |
| 2143 | if (op3 > opStart4) return ERROR(corruption_detected); |
| 2144 | /* note : op4 supposed already verified within main loop */ |
| 2145 | |
| 2146 | /* finish bitStreams one by one */ |
| 2147 | HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); |
| 2148 | HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); |
| 2149 | HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); |
| 2150 | HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); |
| 2151 | |
| 2152 | /* check */ |
| 2153 | endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4); |
| 2154 | if (!endSignal) return ERROR(corruption_detected); |
| 2155 | |
| 2156 | /* decoded size */ |
| 2157 | return dstSize; |
| 2158 | } |
| 2159 | } |
| 2160 | |
| 2161 | |
| 2162 | static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2163 | { |
| 2164 | HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_MAX_TABLELOG); |
| 2165 | const BYTE* ip = (const BYTE*) cSrc; |
| 2166 | |
| 2167 | size_t hSize = HUF_readDTableX4 (DTable, cSrc, cSrcSize); |
| 2168 | if (HUF_isError(hSize)) return hSize; |
| 2169 | if (hSize >= cSrcSize) return ERROR(srcSize_wrong); |
| 2170 | ip += hSize; |
| 2171 | cSrcSize -= hSize; |
| 2172 | |
| 2173 | return HUF_decompress4X4_usingDTable (dst, dstSize, ip, cSrcSize, DTable); |
| 2174 | } |
| 2175 | |
| 2176 | |
| 2177 | /**********************************/ |
| 2178 | /* Generic decompression selector */ |
| 2179 | /**********************************/ |
| 2180 | |
| 2181 | typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; |
| 2182 | static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = |
| 2183 | { |
| 2184 | /* single, double, quad */ |
| 2185 | {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ |
| 2186 | {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ |
| 2187 | {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ |
| 2188 | {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ |
| 2189 | {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ |
| 2190 | {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ |
| 2191 | {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ |
| 2192 | {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ |
| 2193 | {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ |
| 2194 | {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ |
| 2195 | {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ |
| 2196 | {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ |
| 2197 | {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ |
| 2198 | {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ |
| 2199 | {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ |
| 2200 | {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ |
| 2201 | }; |
| 2202 | |
| 2203 | typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); |
| 2204 | |
| 2205 | static size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) |
| 2206 | { |
| 2207 | static const decompressionAlgo decompress[3] = { HUF_decompress4X2, HUF_decompress4X4, NULL }; |
| 2208 | /* estimate decompression time */ |
| 2209 | U32 Q; |
| 2210 | const U32 D256 = (U32)(dstSize >> 8); |
| 2211 | U32 Dtime[3]; |
| 2212 | U32 algoNb = 0; |
| 2213 | int n; |
| 2214 | |
| 2215 | /* validation checks */ |
| 2216 | if (dstSize == 0) return ERROR(dstSize_tooSmall); |
| 2217 | if (cSrcSize > dstSize) return ERROR(corruption_detected); /* invalid */ |
| 2218 | if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */ |
| 2219 | if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ |
| 2220 | |
| 2221 | /* decoder timing evaluation */ |
| 2222 | Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */ |
| 2223 | for (n=0; n<3; n++) |
| 2224 | Dtime[n] = algoTime[Q][n].tableTime + (algoTime[Q][n].decode256Time * D256); |
| 2225 | |
| 2226 | Dtime[1] += Dtime[1] >> 4; Dtime[2] += Dtime[2] >> 3; /* advantage to algorithms using less memory, for cache eviction */ |
| 2227 | |
| 2228 | if (Dtime[1] < Dtime[0]) algoNb = 1; |
| 2229 | |
| 2230 | return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); |
| 2231 | |
| 2232 | //return HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */ |
| 2233 | //return HUF_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */ |
| 2234 | //return HUF_decompress4X6(dst, dstSize, cSrc, cSrcSize); /* multi-streams quad-symbols decoding */ |
| 2235 | } |
| 2236 | /* |
| 2237 | zstd - standard compression library |
| 2238 | Copyright (C) 2014-2015, Yann Collet. |
| 2239 | |
| 2240 | BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) |
| 2241 | |
| 2242 | Redistribution and use in source and binary forms, with or without |
| 2243 | modification, are permitted provided that the following conditions are |
| 2244 | met: |
| 2245 | * Redistributions of source code must retain the above copyright |
| 2246 | notice, this list of conditions and the following disclaimer. |
| 2247 | * Redistributions in binary form must reproduce the above |
| 2248 | copyright notice, this list of conditions and the following disclaimer |
| 2249 | in the documentation and/or other materials provided with the |
| 2250 | distribution. |
| 2251 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 2252 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 2253 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 2254 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 2255 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 2256 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 2257 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 2258 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 2259 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 2260 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 2261 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 2262 | |
| 2263 | You can contact the author at : |
| 2264 | - zstd source repository : https://github.com/Cyan4973/zstd |
| 2265 | - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c |
| 2266 | */ |
| 2267 | |
| 2268 | /* *************************************************************** |
| 2269 | * Tuning parameters |
| 2270 | *****************************************************************/ |
| 2271 | /*! |
| 2272 | * MEMORY_USAGE : |
| 2273 | * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) |
| 2274 | * Increasing memory usage improves compression ratio |
| 2275 | * Reduced memory usage can improve speed, due to cache effect |
| 2276 | */ |
| 2277 | #define ZSTD_MEMORY_USAGE 17 |
| 2278 | |
| 2279 | /*! |
| 2280 | * HEAPMODE : |
| 2281 | * Select how default compression functions will allocate memory for their hash table, |
| 2282 | * in memory stack (0, fastest), or in memory heap (1, requires malloc()) |
| 2283 | * Note that compression context is fairly large, as a consequence heap memory is recommended. |
| 2284 | */ |
| 2285 | #ifndef ZSTD_HEAPMODE |
| 2286 | # define ZSTD_HEAPMODE 1 |
| 2287 | #endif /* ZSTD_HEAPMODE */ |
| 2288 | |
| 2289 | /*! |
| 2290 | * LEGACY_SUPPORT : |
| 2291 | * decompressor can decode older formats (starting from Zstd 0.1+) |
| 2292 | */ |
| 2293 | #ifndef ZSTD_LEGACY_SUPPORT |
| 2294 | # define ZSTD_LEGACY_SUPPORT 1 |
| 2295 | #endif |
| 2296 | |
| 2297 | |
| 2298 | /* ******************************************************* |
| 2299 | * Includes |
| 2300 | *********************************************************/ |
| 2301 | #include <stdlib.h> /* calloc */ |
| 2302 | #include <string.h> /* memcpy, memmove */ |
| 2303 | #include <stdio.h> /* debug : printf */ |
| 2304 | |
| 2305 | |
| 2306 | /* ******************************************************* |
| 2307 | * Compiler specifics |
| 2308 | *********************************************************/ |
| 2309 | #ifdef __AVX2__ |
| 2310 | # include <immintrin.h> /* AVX2 intrinsics */ |
| 2311 | #endif |
| 2312 | |
| 2313 | #ifdef _MSC_VER /* Visual Studio */ |
| 2314 | # include <intrin.h> /* For Visual 2005 */ |
| 2315 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 2316 | # pragma warning(disable : 4324) /* disable: C4324: padded structure */ |
| 2317 | #else |
| 2318 | # define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) |
| 2319 | #endif |
| 2320 | |
| 2321 | |
| 2322 | /* ******************************************************* |
| 2323 | * Constants |
| 2324 | *********************************************************/ |
| 2325 | #define HASH_LOG (ZSTD_MEMORY_USAGE - 2) |
| 2326 | #define HASH_TABLESIZE (1 << HASH_LOG) |
| 2327 | #define HASH_MASK (HASH_TABLESIZE - 1) |
| 2328 | |
| 2329 | #define KNUTH 2654435761 |
| 2330 | |
| 2331 | #define BIT7 128 |
| 2332 | #define BIT6 64 |
| 2333 | #define BIT5 32 |
| 2334 | #define BIT4 16 |
| 2335 | #define BIT1 2 |
| 2336 | #define BIT0 1 |
| 2337 | |
| 2338 | #define KB *(1 <<10) |
| 2339 | #define MB *(1 <<20) |
| 2340 | #define GB *(1U<<30) |
| 2341 | |
| 2342 | #define BLOCKSIZE (128 KB) /* define, for static allocation */ |
| 2343 | #define MIN_SEQUENCES_SIZE (2 /*seqNb*/ + 2 /*dumps*/ + 3 /*seqTables*/ + 1 /*bitStream*/) |
| 2344 | #define MIN_CBLOCK_SIZE (3 /*litCSize*/ + MIN_SEQUENCES_SIZE) |
| 2345 | #define IS_RAW BIT0 |
| 2346 | #define IS_RLE BIT1 |
| 2347 | |
| 2348 | #define WORKPLACESIZE (BLOCKSIZE*3) |
| 2349 | #define MINMATCH 4 |
| 2350 | #define MLbits 7 |
| 2351 | #define LLbits 6 |
| 2352 | #define Offbits 5 |
| 2353 | #define MaxML ((1<<MLbits )-1) |
| 2354 | #define MaxLL ((1<<LLbits )-1) |
| 2355 | #define MaxOff 31 |
| 2356 | #define LitFSELog 11 |
| 2357 | #define MLFSELog 10 |
| 2358 | #define LLFSELog 10 |
| 2359 | #define OffFSELog 9 |
| 2360 | #define MAX(a,b) ((a)<(b)?(b):(a)) |
| 2361 | #define MaxSeq MAX(MaxLL, MaxML) |
| 2362 | |
| 2363 | #define LITERAL_NOENTROPY 63 |
| 2364 | #define COMMAND_NOENTROPY 7 /* to remove */ |
| 2365 | |
| 2366 | static const size_t ZSTD_blockHeaderSize = 3; |
| 2367 | static const size_t ZSTD_frameHeaderSize = 4; |
| 2368 | |
| 2369 | |
| 2370 | /* ******************************************************* |
| 2371 | * Memory operations |
| 2372 | **********************************************************/ |
| 2373 | static void ZSTD_copy4(void* dst, const void* src) { memcpy(dst, src, 4); } |
| 2374 | |
| 2375 | static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); } |
| 2376 | |
| 2377 | #define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; } |
| 2378 | |
| 2379 | /*! ZSTD_wildcopy : custom version of memcpy(), can copy up to 7-8 bytes too many */ |
| 2380 | static void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length) |
| 2381 | { |
| 2382 | const BYTE* ip = (const BYTE*)src; |
| 2383 | BYTE* op = (BYTE*)dst; |
| 2384 | BYTE* const oend = op + length; |
| 2385 | do COPY8(op, ip) while (op < oend); |
| 2386 | } |
| 2387 | |
| 2388 | |
| 2389 | /* ************************************** |
| 2390 | * Local structures |
| 2391 | ****************************************/ |
| 2392 | typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t; |
| 2393 | |
| 2394 | typedef struct |
| 2395 | { |
| 2396 | blockType_t blockType; |
| 2397 | U32 origSize; |
| 2398 | } blockProperties_t; |
| 2399 | |
| 2400 | typedef struct { |
| 2401 | void* buffer; |
| 2402 | U32* offsetStart; |
| 2403 | U32* offset; |
| 2404 | BYTE* offCodeStart; |
| 2405 | BYTE* offCode; |
| 2406 | BYTE* litStart; |
| 2407 | BYTE* lit; |
| 2408 | BYTE* litLengthStart; |
| 2409 | BYTE* litLength; |
| 2410 | BYTE* matchLengthStart; |
| 2411 | BYTE* matchLength; |
| 2412 | BYTE* dumpsStart; |
| 2413 | BYTE* dumps; |
| 2414 | } seqStore_t; |
| 2415 | |
| 2416 | |
| 2417 | /* ************************************* |
| 2418 | * Error Management |
| 2419 | ***************************************/ |
| 2420 | /*! ZSTD_isError |
| 2421 | * tells if a return value is an error code */ |
| 2422 | static unsigned ZSTD_isError(size_t code) { return ERR_isError(code); } |
| 2423 | |
| 2424 | |
| 2425 | |
| 2426 | /* ************************************************************* |
| 2427 | * Decompression section |
| 2428 | ***************************************************************/ |
| 2429 | struct ZSTD_DCtx_s |
| 2430 | { |
| 2431 | U32 LLTable[FSE_DTABLE_SIZE_U32(LLFSELog)]; |
| 2432 | U32 OffTable[FSE_DTABLE_SIZE_U32(OffFSELog)]; |
| 2433 | U32 MLTable[FSE_DTABLE_SIZE_U32(MLFSELog)]; |
| 2434 | void* previousDstEnd; |
| 2435 | void* base; |
| 2436 | size_t expected; |
| 2437 | blockType_t bType; |
| 2438 | U32 phase; |
| 2439 | const BYTE* litPtr; |
| 2440 | size_t litSize; |
| 2441 | BYTE litBuffer[BLOCKSIZE + 8 /* margin for wildcopy */]; |
| 2442 | }; /* typedef'd to ZSTD_Dctx within "zstd_static.h" */ |
| 2443 | |
| 2444 | |
| 2445 | static size_t ZSTD_getcBlockSize(const void* src, size_t srcSize, blockProperties_t* bpPtr) |
| 2446 | { |
| 2447 | const BYTE* const in = (const BYTE* const)src; |
| 2448 | BYTE headerFlags; |
| 2449 | U32 cSize; |
| 2450 | |
| 2451 | if (srcSize < 3) return ERROR(srcSize_wrong); |
| 2452 | |
| 2453 | headerFlags = *in; |
| 2454 | cSize = in[2] + (in[1]<<8) + ((in[0] & 7)<<16); |
| 2455 | |
| 2456 | bpPtr->blockType = (blockType_t)(headerFlags >> 6); |
| 2457 | bpPtr->origSize = (bpPtr->blockType == bt_rle) ? cSize : 0; |
| 2458 | |
| 2459 | if (bpPtr->blockType == bt_end) return 0; |
| 2460 | if (bpPtr->blockType == bt_rle) return 1; |
| 2461 | return cSize; |
| 2462 | } |
| 2463 | |
| 2464 | static size_t ZSTD_copyUncompressedBlock(void* dst, size_t maxDstSize, const void* src, size_t srcSize) |
| 2465 | { |
| 2466 | if (srcSize > maxDstSize) return ERROR(dstSize_tooSmall); |
| 2467 | memcpy(dst, src, srcSize); |
| 2468 | return srcSize; |
| 2469 | } |
| 2470 | |
| 2471 | |
| 2472 | /** ZSTD_decompressLiterals |
| 2473 | @return : nb of bytes read from src, or an error code*/ |
| 2474 | static size_t ZSTD_decompressLiterals(void* dst, size_t* maxDstSizePtr, |
| 2475 | const void* src, size_t srcSize) |
| 2476 | { |
| 2477 | const BYTE* ip = (const BYTE*)src; |
| 2478 | |
| 2479 | const size_t litSize = (MEM_readLE32(src) & 0x1FFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */ |
| 2480 | const size_t litCSize = (MEM_readLE32(ip+2) & 0xFFFFFF) >> 5; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */ |
| 2481 | |
| 2482 | if (litSize > *maxDstSizePtr) return ERROR(corruption_detected); |
| 2483 | if (litCSize + 5 > srcSize) return ERROR(corruption_detected); |
| 2484 | |
| 2485 | if (HUF_isError(HUF_decompress(dst, litSize, ip+5, litCSize))) return ERROR(corruption_detected); |
| 2486 | |
| 2487 | *maxDstSizePtr = litSize; |
| 2488 | return litCSize + 5; |
| 2489 | } |
| 2490 | |
| 2491 | |
| 2492 | /** ZSTD_decodeLiteralsBlock |
| 2493 | @return : nb of bytes read from src (< srcSize )*/ |
| 2494 | static size_t ZSTD_decodeLiteralsBlock(void* ctx, |
| 2495 | const void* src, size_t srcSize) |
| 2496 | { |
| 2497 | ZSTD_DCtx* dctx = (ZSTD_DCtx*)ctx; |
| 2498 | const BYTE* const istart = (const BYTE* const)src; |
| 2499 | |
| 2500 | /* any compressed block with literals segment must be at least this size */ |
| 2501 | if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected); |
| 2502 | |
| 2503 | switch(*istart & 3) |
| 2504 | { |
| 2505 | default: |
| 2506 | case 0: |
| 2507 | { |
| 2508 | size_t litSize = BLOCKSIZE; |
| 2509 | const size_t readSize = ZSTD_decompressLiterals(dctx->litBuffer, &litSize, src, srcSize); |
| 2510 | dctx->litPtr = dctx->litBuffer; |
| 2511 | dctx->litSize = litSize; |
| 2512 | memset(dctx->litBuffer + dctx->litSize, 0, 8); |
| 2513 | return readSize; /* works if it's an error too */ |
| 2514 | } |
| 2515 | case IS_RAW: |
| 2516 | { |
| 2517 | const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */ |
| 2518 | if (litSize > srcSize-11) /* risk of reading too far with wildcopy */ |
| 2519 | { |
| 2520 | if (litSize > srcSize-3) return ERROR(corruption_detected); |
| 2521 | memcpy(dctx->litBuffer, istart, litSize); |
| 2522 | dctx->litPtr = dctx->litBuffer; |
| 2523 | dctx->litSize = litSize; |
| 2524 | memset(dctx->litBuffer + dctx->litSize, 0, 8); |
| 2525 | return litSize+3; |
| 2526 | } |
| 2527 | /* direct reference into compressed stream */ |
| 2528 | dctx->litPtr = istart+3; |
| 2529 | dctx->litSize = litSize; |
| 2530 | return litSize+3; |
| 2531 | } |
| 2532 | case IS_RLE: |
| 2533 | { |
| 2534 | const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */ |
| 2535 | if (litSize > BLOCKSIZE) return ERROR(corruption_detected); |
| 2536 | memset(dctx->litBuffer, istart[3], litSize + 8); |
| 2537 | dctx->litPtr = dctx->litBuffer; |
| 2538 | dctx->litSize = litSize; |
| 2539 | return 4; |
| 2540 | } |
| 2541 | } |
| 2542 | } |
| 2543 | |
| 2544 | |
| 2545 | static size_t ZSTD_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr, |
| 2546 | FSE_DTable* DTableLL, FSE_DTable* DTableML, FSE_DTable* DTableOffb, |
| 2547 | const void* src, size_t srcSize) |
| 2548 | { |
| 2549 | const BYTE* const istart = (const BYTE* const)src; |
| 2550 | const BYTE* ip = istart; |
| 2551 | const BYTE* const iend = istart + srcSize; |
| 2552 | U32 LLtype, Offtype, MLtype; |
| 2553 | U32 LLlog, Offlog, MLlog; |
| 2554 | size_t dumpsLength; |
| 2555 | |
| 2556 | /* check */ |
| 2557 | if (srcSize < 5) return ERROR(srcSize_wrong); |
| 2558 | |
| 2559 | /* SeqHead */ |
| 2560 | *nbSeq = MEM_readLE16(ip); ip+=2; |
| 2561 | LLtype = *ip >> 6; |
| 2562 | Offtype = (*ip >> 4) & 3; |
| 2563 | MLtype = (*ip >> 2) & 3; |
| 2564 | if (*ip & 2) |
| 2565 | { |
| 2566 | dumpsLength = ip[2]; |
| 2567 | dumpsLength += ip[1] << 8; |
| 2568 | ip += 3; |
| 2569 | } |
| 2570 | else |
| 2571 | { |
| 2572 | dumpsLength = ip[1]; |
| 2573 | dumpsLength += (ip[0] & 1) << 8; |
| 2574 | ip += 2; |
| 2575 | } |
| 2576 | *dumpsPtr = ip; |
| 2577 | ip += dumpsLength; |
| 2578 | *dumpsLengthPtr = dumpsLength; |
| 2579 | |
| 2580 | /* check */ |
| 2581 | if (ip > iend-3) return ERROR(srcSize_wrong); /* min : all 3 are "raw", hence no header, but at least xxLog bits per type */ |
| 2582 | |
| 2583 | /* sequences */ |
| 2584 | { |
| 2585 | S16 norm[MaxML+1]; /* assumption : MaxML >= MaxLL and MaxOff */ |
| 2586 | size_t headerSize; |
| 2587 | |
| 2588 | /* Build DTables */ |
| 2589 | switch(LLtype) |
| 2590 | { |
| 2591 | case bt_rle : |
| 2592 | LLlog = 0; |
| 2593 | FSE_buildDTable_rle(DTableLL, *ip++); break; |
| 2594 | case bt_raw : |
| 2595 | LLlog = LLbits; |
| 2596 | FSE_buildDTable_raw(DTableLL, LLbits); break; |
| 2597 | default : |
| 2598 | { U32 max = MaxLL; |
| 2599 | headerSize = FSE_readNCount(norm, &max, &LLlog, ip, iend-ip); |
| 2600 | if (FSE_isError(headerSize)) return ERROR(GENERIC); |
| 2601 | if (LLlog > LLFSELog) return ERROR(corruption_detected); |
| 2602 | ip += headerSize; |
| 2603 | FSE_buildDTable(DTableLL, norm, max, LLlog); |
| 2604 | } } |
| 2605 | |
| 2606 | switch(Offtype) |
| 2607 | { |
| 2608 | case bt_rle : |
| 2609 | Offlog = 0; |
| 2610 | if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ |
| 2611 | FSE_buildDTable_rle(DTableOffb, *ip++ & MaxOff); /* if *ip > MaxOff, data is corrupted */ |
| 2612 | break; |
| 2613 | case bt_raw : |
| 2614 | Offlog = Offbits; |
| 2615 | FSE_buildDTable_raw(DTableOffb, Offbits); break; |
| 2616 | default : |
| 2617 | { U32 max = MaxOff; |
| 2618 | headerSize = FSE_readNCount(norm, &max, &Offlog, ip, iend-ip); |
| 2619 | if (FSE_isError(headerSize)) return ERROR(GENERIC); |
| 2620 | if (Offlog > OffFSELog) return ERROR(corruption_detected); |
| 2621 | ip += headerSize; |
| 2622 | FSE_buildDTable(DTableOffb, norm, max, Offlog); |
| 2623 | } } |
| 2624 | |
| 2625 | switch(MLtype) |
| 2626 | { |
| 2627 | case bt_rle : |
| 2628 | MLlog = 0; |
| 2629 | if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ |
| 2630 | FSE_buildDTable_rle(DTableML, *ip++); break; |
| 2631 | case bt_raw : |
| 2632 | MLlog = MLbits; |
| 2633 | FSE_buildDTable_raw(DTableML, MLbits); break; |
| 2634 | default : |
| 2635 | { U32 max = MaxML; |
| 2636 | headerSize = FSE_readNCount(norm, &max, &MLlog, ip, iend-ip); |
| 2637 | if (FSE_isError(headerSize)) return ERROR(GENERIC); |
| 2638 | if (MLlog > MLFSELog) return ERROR(corruption_detected); |
| 2639 | ip += headerSize; |
| 2640 | FSE_buildDTable(DTableML, norm, max, MLlog); |
| 2641 | } } } |
| 2642 | |
| 2643 | return ip-istart; |
| 2644 | } |
| 2645 | |
| 2646 | |
| 2647 | typedef struct { |
| 2648 | size_t litLength; |
| 2649 | size_t offset; |
| 2650 | size_t matchLength; |
| 2651 | } seq_t; |
| 2652 | |
| 2653 | typedef struct { |
| 2654 | BIT_DStream_t DStream; |
| 2655 | FSE_DState_t stateLL; |
| 2656 | FSE_DState_t stateOffb; |
| 2657 | FSE_DState_t stateML; |
| 2658 | size_t prevOffset; |
| 2659 | const BYTE* dumps; |
| 2660 | const BYTE* dumpsEnd; |
| 2661 | } seqState_t; |
| 2662 | |
| 2663 | |
| 2664 | static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState) |
| 2665 | { |
| 2666 | size_t litLength; |
| 2667 | size_t prevOffset; |
| 2668 | size_t offset; |
| 2669 | size_t matchLength; |
| 2670 | const BYTE* dumps = seqState->dumps; |
| 2671 | const BYTE* const de = seqState->dumpsEnd; |
| 2672 | |
| 2673 | /* Literal length */ |
| 2674 | litLength = FSE_decodeSymbol(&(seqState->stateLL), &(seqState->DStream)); |
| 2675 | prevOffset = litLength ? seq->offset : seqState->prevOffset; |
| 2676 | seqState->prevOffset = seq->offset; |
| 2677 | if (litLength == MaxLL) |
| 2678 | { |
| 2679 | U32 add = *dumps++; |
| 2680 | if (add < 255) litLength += add; |
| 2681 | else |
| 2682 | { |
| 2683 | litLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */ |
| 2684 | dumps += 3; |
| 2685 | } |
| 2686 | if (dumps >= de) dumps = de-1; /* late correction, to avoid read overflow (data is now corrupted anyway) */ |
| 2687 | } |
| 2688 | |
| 2689 | /* Offset */ |
| 2690 | { |
| 2691 | static const size_t offsetPrefix[MaxOff+1] = { /* note : size_t faster than U32 */ |
| 2692 | 1 /*fake*/, 1, 2, 4, 8, 16, 32, 64, 128, 256, |
| 2693 | 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, |
| 2694 | 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, /*fake*/ 1, 1, 1, 1, 1 }; |
| 2695 | U32 offsetCode, nbBits; |
| 2696 | offsetCode = FSE_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream)); /* <= maxOff, by table construction */ |
| 2697 | if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream)); |
| 2698 | nbBits = offsetCode - 1; |
| 2699 | if (offsetCode==0) nbBits = 0; /* cmove */ |
| 2700 | offset = offsetPrefix[offsetCode] + BIT_readBits(&(seqState->DStream), nbBits); |
| 2701 | if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream)); |
| 2702 | if (offsetCode==0) offset = prevOffset; /* cmove */ |
| 2703 | } |
| 2704 | |
| 2705 | /* MatchLength */ |
| 2706 | matchLength = FSE_decodeSymbol(&(seqState->stateML), &(seqState->DStream)); |
| 2707 | if (matchLength == MaxML) |
| 2708 | { |
| 2709 | U32 add = *dumps++; |
| 2710 | if (add < 255) matchLength += add; |
| 2711 | else |
| 2712 | { |
| 2713 | matchLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */ |
| 2714 | dumps += 3; |
| 2715 | } |
| 2716 | if (dumps >= de) dumps = de-1; /* late correction, to avoid read overflow (data is now corrupted anyway) */ |
| 2717 | } |
| 2718 | matchLength += MINMATCH; |
| 2719 | |
| 2720 | /* save result */ |
| 2721 | seq->litLength = litLength; |
| 2722 | seq->offset = offset; |
| 2723 | seq->matchLength = matchLength; |
| 2724 | seqState->dumps = dumps; |
| 2725 | } |
| 2726 | |
| 2727 | |
| 2728 | static size_t ZSTD_execSequence(BYTE* op, |
| 2729 | seq_t sequence, |
| 2730 | const BYTE** litPtr, const BYTE* const litLimit, |
| 2731 | BYTE* const base, BYTE* const oend) |
| 2732 | { |
| 2733 | static const int dec32table[] = {0, 1, 2, 1, 4, 4, 4, 4}; /* added */ |
| 2734 | static const int dec64table[] = {8, 8, 8, 7, 8, 9,10,11}; /* substracted */ |
| 2735 | const BYTE* const ostart = op; |
| 2736 | BYTE* const oLitEnd = op + sequence.litLength; |
| 2737 | BYTE* const oMatchEnd = op + sequence.litLength + sequence.matchLength; /* risk : address space overflow (32-bits) */ |
| 2738 | BYTE* const oend_8 = oend-8; |
| 2739 | const BYTE* const litEnd = *litPtr + sequence.litLength; |
| 2740 | |
| 2741 | /* checks */ |
| 2742 | if (oLitEnd > oend_8) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of 8 from oend */ |
| 2743 | if (oMatchEnd > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */ |
| 2744 | if (litEnd > litLimit) return ERROR(corruption_detected); /* overRead beyond lit buffer */ |
| 2745 | |
| 2746 | /* copy Literals */ |
| 2747 | ZSTD_wildcopy(op, *litPtr, sequence.litLength); /* note : oLitEnd <= oend-8 : no risk of overwrite beyond oend */ |
| 2748 | op = oLitEnd; |
| 2749 | *litPtr = litEnd; /* update for next sequence */ |
| 2750 | |
| 2751 | /* copy Match */ |
| 2752 | { |
| 2753 | const BYTE* match = op - sequence.offset; |
| 2754 | |
| 2755 | /* check */ |
| 2756 | if (sequence.offset > (size_t)op) return ERROR(corruption_detected); /* address space overflow test (this test seems kept by clang optimizer) */ |
| 2757 | //if (match > op) return ERROR(corruption_detected); /* address space overflow test (is clang optimizer removing this test ?) */ |
| 2758 | if (match < base) return ERROR(corruption_detected); |
| 2759 | |
| 2760 | /* close range match, overlap */ |
| 2761 | if (sequence.offset < 8) |
| 2762 | { |
| 2763 | const int dec64 = dec64table[sequence.offset]; |
| 2764 | op[0] = match[0]; |
| 2765 | op[1] = match[1]; |
| 2766 | op[2] = match[2]; |
| 2767 | op[3] = match[3]; |
| 2768 | match += dec32table[sequence.offset]; |
| 2769 | ZSTD_copy4(op+4, match); |
| 2770 | match -= dec64; |
| 2771 | } |
| 2772 | else |
| 2773 | { |
| 2774 | ZSTD_copy8(op, match); |
| 2775 | } |
| 2776 | op += 8; match += 8; |
| 2777 | |
| 2778 | if (oMatchEnd > oend-(16-MINMATCH)) |
| 2779 | { |
| 2780 | if (op < oend_8) |
| 2781 | { |
| 2782 | ZSTD_wildcopy(op, match, oend_8 - op); |
| 2783 | match += oend_8 - op; |
| 2784 | op = oend_8; |
| 2785 | } |
| 2786 | while (op < oMatchEnd) *op++ = *match++; |
| 2787 | } |
| 2788 | else |
| 2789 | { |
| 2790 | ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */ |
| 2791 | } |
| 2792 | } |
| 2793 | |
| 2794 | return oMatchEnd - ostart; |
| 2795 | } |
| 2796 | |
| 2797 | static size_t ZSTD_decompressSequences( |
| 2798 | void* ctx, |
| 2799 | void* dst, size_t maxDstSize, |
| 2800 | const void* seqStart, size_t seqSize) |
| 2801 | { |
| 2802 | ZSTD_DCtx* dctx = (ZSTD_DCtx*)ctx; |
| 2803 | const BYTE* ip = (const BYTE*)seqStart; |
| 2804 | const BYTE* const iend = ip + seqSize; |
| 2805 | BYTE* const ostart = (BYTE* const)dst; |
| 2806 | BYTE* op = ostart; |
| 2807 | BYTE* const oend = ostart + maxDstSize; |
| 2808 | size_t errorCode, dumpsLength; |
| 2809 | const BYTE* litPtr = dctx->litPtr; |
| 2810 | const BYTE* const litEnd = litPtr + dctx->litSize; |
| 2811 | int nbSeq; |
| 2812 | const BYTE* dumps; |
| 2813 | U32* DTableLL = dctx->LLTable; |
| 2814 | U32* DTableML = dctx->MLTable; |
| 2815 | U32* DTableOffb = dctx->OffTable; |
| 2816 | BYTE* const base = (BYTE*) (dctx->base); |
| 2817 | |
| 2818 | /* Build Decoding Tables */ |
| 2819 | errorCode = ZSTD_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength, |
| 2820 | DTableLL, DTableML, DTableOffb, |
| 2821 | ip, iend-ip); |
| 2822 | if (ZSTD_isError(errorCode)) return errorCode; |
| 2823 | ip += errorCode; |
| 2824 | |
| 2825 | /* Regen sequences */ |
| 2826 | { |
| 2827 | seq_t sequence; |
| 2828 | seqState_t seqState; |
| 2829 | |
| 2830 | memset(&sequence, 0, sizeof(sequence)); |
| 2831 | seqState.dumps = dumps; |
| 2832 | seqState.dumpsEnd = dumps + dumpsLength; |
| 2833 | seqState.prevOffset = sequence.offset = 4; |
| 2834 | errorCode = BIT_initDStream(&(seqState.DStream), ip, iend-ip); |
| 2835 | if (ERR_isError(errorCode)) return ERROR(corruption_detected); |
| 2836 | FSE_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL); |
| 2837 | FSE_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb); |
| 2838 | FSE_initDState(&(seqState.stateML), &(seqState.DStream), DTableML); |
| 2839 | |
| 2840 | for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && (nbSeq>0) ; ) |
| 2841 | { |
| 2842 | size_t oneSeqSize; |
| 2843 | nbSeq--; |
| 2844 | ZSTD_decodeSequence(&sequence, &seqState); |
| 2845 | oneSeqSize = ZSTD_execSequence(op, sequence, &litPtr, litEnd, base, oend); |
| 2846 | if (ZSTD_isError(oneSeqSize)) return oneSeqSize; |
| 2847 | op += oneSeqSize; |
| 2848 | } |
| 2849 | |
| 2850 | /* check if reached exact end */ |
| 2851 | if ( !BIT_endOfDStream(&(seqState.DStream)) ) return ERROR(corruption_detected); /* requested too much : data is corrupted */ |
| 2852 | if (nbSeq<0) return ERROR(corruption_detected); /* requested too many sequences : data is corrupted */ |
| 2853 | |
| 2854 | /* last literal segment */ |
| 2855 | { |
| 2856 | size_t lastLLSize = litEnd - litPtr; |
| 2857 | if (litPtr > litEnd) return ERROR(corruption_detected); |
| 2858 | if (op+lastLLSize > oend) return ERROR(dstSize_tooSmall); |
| 2859 | if (op != litPtr) memmove(op, litPtr, lastLLSize); |
| 2860 | op += lastLLSize; |
| 2861 | } |
| 2862 | } |
| 2863 | |
| 2864 | return op-ostart; |
| 2865 | } |
| 2866 | |
| 2867 | |
| 2868 | static size_t ZSTD_decompressBlock( |
| 2869 | void* ctx, |
| 2870 | void* dst, size_t maxDstSize, |
| 2871 | const void* src, size_t srcSize) |
| 2872 | { |
| 2873 | /* blockType == blockCompressed */ |
| 2874 | const BYTE* ip = (const BYTE*)src; |
| 2875 | |
| 2876 | /* Decode literals sub-block */ |
| 2877 | size_t litCSize = ZSTD_decodeLiteralsBlock(ctx, src, srcSize); |
| 2878 | if (ZSTD_isError(litCSize)) return litCSize; |
| 2879 | ip += litCSize; |
| 2880 | srcSize -= litCSize; |
| 2881 | |
| 2882 | return ZSTD_decompressSequences(ctx, dst, maxDstSize, ip, srcSize); |
| 2883 | } |
| 2884 | |
| 2885 | |
| 2886 | static size_t ZSTD_decompressDCtx(void* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) |
| 2887 | { |
| 2888 | const BYTE* ip = (const BYTE*)src; |
| 2889 | const BYTE* iend = ip + srcSize; |
| 2890 | BYTE* const ostart = (BYTE* const)dst; |
| 2891 | BYTE* op = ostart; |
| 2892 | BYTE* const oend = ostart + maxDstSize; |
| 2893 | size_t remainingSize = srcSize; |
| 2894 | U32 magicNumber; |
| 2895 | blockProperties_t blockProperties; |
| 2896 | |
| 2897 | /* Frame Header */ |
| 2898 | if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); |
| 2899 | magicNumber = MEM_readLE32(src); |
| 2900 | if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown); |
| 2901 | ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize; |
| 2902 | |
| 2903 | /* Loop on each block */ |
| 2904 | while (1) |
| 2905 | { |
| 2906 | size_t decodedSize=0; |
| 2907 | size_t cBlockSize = ZSTD_getcBlockSize(ip, iend-ip, &blockProperties); |
| 2908 | if (ZSTD_isError(cBlockSize)) return cBlockSize; |
| 2909 | |
| 2910 | ip += ZSTD_blockHeaderSize; |
| 2911 | remainingSize -= ZSTD_blockHeaderSize; |
| 2912 | if (cBlockSize > remainingSize) return ERROR(srcSize_wrong); |
| 2913 | |
| 2914 | switch(blockProperties.blockType) |
| 2915 | { |
| 2916 | case bt_compressed: |
| 2917 | decodedSize = ZSTD_decompressBlock(ctx, op, oend-op, ip, cBlockSize); |
| 2918 | break; |
| 2919 | case bt_raw : |
| 2920 | decodedSize = ZSTD_copyUncompressedBlock(op, oend-op, ip, cBlockSize); |
| 2921 | break; |
| 2922 | case bt_rle : |
| 2923 | return ERROR(GENERIC); /* not yet supported */ |
| 2924 | break; |
| 2925 | case bt_end : |
| 2926 | /* end of frame */ |
| 2927 | if (remainingSize) return ERROR(srcSize_wrong); |
| 2928 | break; |
| 2929 | default: |
| 2930 | return ERROR(GENERIC); /* impossible */ |
| 2931 | } |
| 2932 | if (cBlockSize == 0) break; /* bt_end */ |
| 2933 | |
| 2934 | if (ZSTD_isError(decodedSize)) return decodedSize; |
| 2935 | op += decodedSize; |
| 2936 | ip += cBlockSize; |
| 2937 | remainingSize -= cBlockSize; |
| 2938 | } |
| 2939 | |
| 2940 | return op-ostart; |
| 2941 | } |
| 2942 | |
| 2943 | static size_t ZSTD_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize) |
| 2944 | { |
| 2945 | ZSTD_DCtx ctx; |
| 2946 | ctx.base = dst; |
| 2947 | return ZSTD_decompressDCtx(&ctx, dst, maxDstSize, src, srcSize); |
| 2948 | } |
| 2949 | |
| 2950 | static size_t ZSTD_findFrameCompressedSize(const void* src, size_t srcSize) |
| 2951 | { |
| 2952 | const BYTE* ip = (const BYTE*)src; |
| 2953 | size_t remainingSize = srcSize; |
| 2954 | U32 magicNumber; |
| 2955 | blockProperties_t blockProperties; |
| 2956 | |
| 2957 | /* Frame Header */ |
| 2958 | if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong); |
| 2959 | magicNumber = MEM_readLE32(src); |
| 2960 | if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown); |
| 2961 | ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize; |
| 2962 | |
| 2963 | /* Loop on each block */ |
| 2964 | while (1) |
| 2965 | { |
| 2966 | size_t cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties); |
| 2967 | if (ZSTD_isError(cBlockSize)) return cBlockSize; |
| 2968 | |
| 2969 | ip += ZSTD_blockHeaderSize; |
| 2970 | remainingSize -= ZSTD_blockHeaderSize; |
| 2971 | if (cBlockSize > remainingSize) return ERROR(srcSize_wrong); |
| 2972 | |
| 2973 | if (cBlockSize == 0) break; /* bt_end */ |
| 2974 | |
| 2975 | ip += cBlockSize; |
| 2976 | remainingSize -= cBlockSize; |
| 2977 | } |
| 2978 | |
| 2979 | return ip - (const BYTE*)src; |
| 2980 | } |
| 2981 | |
| 2982 | |
| 2983 | /******************************* |
| 2984 | * Streaming Decompression API |
| 2985 | *******************************/ |
| 2986 | |
| 2987 | static size_t ZSTD_resetDCtx(ZSTD_DCtx* dctx) |
| 2988 | { |
| 2989 | dctx->expected = ZSTD_frameHeaderSize; |
| 2990 | dctx->phase = 0; |
| 2991 | dctx->previousDstEnd = NULL; |
| 2992 | dctx->base = NULL; |
| 2993 | return 0; |
| 2994 | } |
| 2995 | |
| 2996 | static ZSTD_DCtx* ZSTD_createDCtx(void) |
| 2997 | { |
| 2998 | ZSTD_DCtx* dctx = (ZSTD_DCtx*)malloc(sizeof(ZSTD_DCtx)); |
| 2999 | if (dctx==NULL) return NULL; |
| 3000 | ZSTD_resetDCtx(dctx); |
| 3001 | return dctx; |
| 3002 | } |
| 3003 | |
| 3004 | static size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx) |
| 3005 | { |
| 3006 | free(dctx); |
| 3007 | return 0; |
| 3008 | } |
| 3009 | |
| 3010 | static size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) |
| 3011 | { |
| 3012 | return dctx->expected; |
| 3013 | } |
| 3014 | |
| 3015 | static size_t ZSTD_decompressContinue(ZSTD_DCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) |
| 3016 | { |
| 3017 | /* Sanity check */ |
| 3018 | if (srcSize != ctx->expected) return ERROR(srcSize_wrong); |
| 3019 | if (dst != ctx->previousDstEnd) /* not contiguous */ |
| 3020 | ctx->base = dst; |
| 3021 | |
| 3022 | /* Decompress : frame header */ |
| 3023 | if (ctx->phase == 0) |
| 3024 | { |
| 3025 | /* Check frame magic header */ |
| 3026 | U32 magicNumber = MEM_readLE32(src); |
| 3027 | if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown); |
| 3028 | ctx->phase = 1; |
| 3029 | ctx->expected = ZSTD_blockHeaderSize; |
| 3030 | return 0; |
| 3031 | } |
| 3032 | |
| 3033 | /* Decompress : block header */ |
| 3034 | if (ctx->phase == 1) |
| 3035 | { |
| 3036 | blockProperties_t bp; |
| 3037 | size_t blockSize = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp); |
| 3038 | if (ZSTD_isError(blockSize)) return blockSize; |
| 3039 | if (bp.blockType == bt_end) |
| 3040 | { |
| 3041 | ctx->expected = 0; |
| 3042 | ctx->phase = 0; |
| 3043 | } |
| 3044 | else |
| 3045 | { |
| 3046 | ctx->expected = blockSize; |
| 3047 | ctx->bType = bp.blockType; |
| 3048 | ctx->phase = 2; |
| 3049 | } |
| 3050 | |
| 3051 | return 0; |
| 3052 | } |
| 3053 | |
| 3054 | /* Decompress : block content */ |
| 3055 | { |
| 3056 | size_t rSize; |
| 3057 | switch(ctx->bType) |
| 3058 | { |
| 3059 | case bt_compressed: |
| 3060 | rSize = ZSTD_decompressBlock(ctx, dst, maxDstSize, src, srcSize); |
| 3061 | break; |
| 3062 | case bt_raw : |
| 3063 | rSize = ZSTD_copyUncompressedBlock(dst, maxDstSize, src, srcSize); |
| 3064 | break; |
| 3065 | case bt_rle : |
| 3066 | return ERROR(GENERIC); /* not yet handled */ |
| 3067 | break; |
| 3068 | case bt_end : /* should never happen (filtered at phase 1) */ |
| 3069 | rSize = 0; |
| 3070 | break; |
| 3071 | default: |
| 3072 | return ERROR(GENERIC); |
| 3073 | } |
| 3074 | ctx->phase = 1; |
| 3075 | ctx->expected = ZSTD_blockHeaderSize; |
| 3076 | ctx->previousDstEnd = (void*)( ((char*)dst) + rSize); |
| 3077 | return rSize; |
| 3078 | } |
| 3079 | |
| 3080 | } |
| 3081 | |
| 3082 | |
| 3083 | /* wrapper layer */ |
| 3084 | |
| 3085 | unsigned ZSTDv03_isError(size_t code) |
| 3086 | { |
| 3087 | return ZSTD_isError(code); |
| 3088 | } |
| 3089 | |
| 3090 | size_t ZSTDv03_decompress( void* dst, size_t maxOriginalSize, |
| 3091 | const void* src, size_t compressedSize) |
| 3092 | { |
| 3093 | return ZSTD_decompress(dst, maxOriginalSize, src, compressedSize); |
| 3094 | } |
| 3095 | |
| 3096 | size_t ZSTDv03_findFrameCompressedSize(const void* src, size_t srcSize) |
| 3097 | { |
| 3098 | return ZSTD_findFrameCompressedSize(src, srcSize); |
| 3099 | } |
| 3100 | |
| 3101 | ZSTDv03_Dctx* ZSTDv03_createDCtx(void) |
| 3102 | { |
| 3103 | return (ZSTDv03_Dctx*)ZSTD_createDCtx(); |
| 3104 | } |
| 3105 | |
| 3106 | size_t ZSTDv03_freeDCtx(ZSTDv03_Dctx* dctx) |
| 3107 | { |
| 3108 | return ZSTD_freeDCtx((ZSTD_DCtx*)dctx); |
| 3109 | } |
| 3110 | |
| 3111 | size_t ZSTDv03_resetDCtx(ZSTDv03_Dctx* dctx) |
| 3112 | { |
| 3113 | return ZSTD_resetDCtx((ZSTD_DCtx*)dctx); |
| 3114 | } |
| 3115 | |
| 3116 | size_t ZSTDv03_nextSrcSizeToDecompress(ZSTDv03_Dctx* dctx) |
| 3117 | { |
| 3118 | return ZSTD_nextSrcSizeToDecompress((ZSTD_DCtx*)dctx); |
| 3119 | } |
| 3120 | |
| 3121 | size_t ZSTDv03_decompressContinue(ZSTDv03_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) |
| 3122 | { |
| 3123 | return ZSTD_decompressContinue((ZSTD_DCtx*)dctx, dst, maxDstSize, src, srcSize); |
| 3124 | } |