443 lines
20 KiB
C
443 lines
20 KiB
C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/*-*************************************
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* Dependencies
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***************************************/
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#include "zstd_compress_sequences.h"
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/**
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* -log2(x / 256) lookup table for x in [0, 256).
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* If x == 0: Return 0
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* Else: Return floor(-log2(x / 256) * 256)
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*/
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static unsigned const kInverseProbabilityLog256[256] = {
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0, 2048, 1792, 1642, 1536, 1453, 1386, 1329, 1280, 1236, 1197, 1162,
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1130, 1100, 1073, 1047, 1024, 1001, 980, 960, 941, 923, 906, 889,
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874, 859, 844, 830, 817, 804, 791, 779, 768, 756, 745, 734,
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724, 714, 704, 694, 685, 676, 667, 658, 650, 642, 633, 626,
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618, 610, 603, 595, 588, 581, 574, 567, 561, 554, 548, 542,
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535, 529, 523, 517, 512, 506, 500, 495, 489, 484, 478, 473,
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468, 463, 458, 453, 448, 443, 438, 434, 429, 424, 420, 415,
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411, 407, 402, 398, 394, 390, 386, 382, 377, 373, 370, 366,
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362, 358, 354, 350, 347, 343, 339, 336, 332, 329, 325, 322,
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318, 315, 311, 308, 305, 302, 298, 295, 292, 289, 286, 282,
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279, 276, 273, 270, 267, 264, 261, 258, 256, 253, 250, 247,
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244, 241, 239, 236, 233, 230, 228, 225, 222, 220, 217, 215,
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212, 209, 207, 204, 202, 199, 197, 194, 192, 190, 187, 185,
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182, 180, 178, 175, 173, 171, 168, 166, 164, 162, 159, 157,
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155, 153, 151, 149, 146, 144, 142, 140, 138, 136, 134, 132,
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130, 128, 126, 123, 121, 119, 117, 115, 114, 112, 110, 108,
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106, 104, 102, 100, 98, 96, 94, 93, 91, 89, 87, 85,
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83, 82, 80, 78, 76, 74, 73, 71, 69, 67, 66, 64,
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62, 61, 59, 57, 55, 54, 52, 50, 49, 47, 46, 44,
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42, 41, 39, 37, 36, 34, 33, 31, 30, 28, 26, 25,
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23, 22, 20, 19, 17, 16, 14, 13, 11, 10, 8, 7,
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5, 4, 2, 1,
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};
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static unsigned ZSTD_getFSEMaxSymbolValue(FSE_CTable const* ctable) {
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void const* ptr = ctable;
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U16 const* u16ptr = (U16 const*)ptr;
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U32 const maxSymbolValue = MEM_read16(u16ptr + 1);
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return maxSymbolValue;
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}
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/**
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* Returns true if we should use ncount=-1 else we should
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* use ncount=1 for low probability symbols instead.
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*/
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static unsigned ZSTD_useLowProbCount(size_t const nbSeq)
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{
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/* Heuristic: This should cover most blocks <= 16K and
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* start to fade out after 16K to about 32K depending on
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* compressibility.
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*/
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return nbSeq >= 2048;
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}
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/**
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* Returns the cost in bytes of encoding the normalized count header.
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* Returns an error if any of the helper functions return an error.
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*/
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static size_t ZSTD_NCountCost(unsigned const* count, unsigned const max,
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size_t const nbSeq, unsigned const FSELog)
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{
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BYTE wksp[FSE_NCOUNTBOUND];
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S16 norm[MaxSeq + 1];
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const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
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FORWARD_IF_ERROR(FSE_normalizeCount(norm, tableLog, count, nbSeq, max, ZSTD_useLowProbCount(nbSeq)), "");
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return FSE_writeNCount(wksp, sizeof(wksp), norm, max, tableLog);
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}
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/**
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* Returns the cost in bits of encoding the distribution described by count
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* using the entropy bound.
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*/
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static size_t ZSTD_entropyCost(unsigned const* count, unsigned const max, size_t const total)
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{
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unsigned cost = 0;
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unsigned s;
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assert(total > 0);
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for (s = 0; s <= max; ++s) {
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unsigned norm = (unsigned)((256 * count[s]) / total);
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if (count[s] != 0 && norm == 0)
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norm = 1;
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assert(count[s] < total);
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cost += count[s] * kInverseProbabilityLog256[norm];
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}
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return cost >> 8;
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}
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/**
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* Returns the cost in bits of encoding the distribution in count using ctable.
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* Returns an error if ctable cannot represent all the symbols in count.
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*/
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size_t ZSTD_fseBitCost(
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FSE_CTable const* ctable,
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unsigned const* count,
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unsigned const max)
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{
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unsigned const kAccuracyLog = 8;
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size_t cost = 0;
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unsigned s;
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FSE_CState_t cstate;
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FSE_initCState(&cstate, ctable);
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if (ZSTD_getFSEMaxSymbolValue(ctable) < max) {
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DEBUGLOG(5, "Repeat FSE_CTable has maxSymbolValue %u < %u",
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ZSTD_getFSEMaxSymbolValue(ctable), max);
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return ERROR(GENERIC);
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}
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for (s = 0; s <= max; ++s) {
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unsigned const tableLog = cstate.stateLog;
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unsigned const badCost = (tableLog + 1) << kAccuracyLog;
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unsigned const bitCost = FSE_bitCost(cstate.symbolTT, tableLog, s, kAccuracyLog);
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if (count[s] == 0)
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continue;
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if (bitCost >= badCost) {
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DEBUGLOG(5, "Repeat FSE_CTable has Prob[%u] == 0", s);
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return ERROR(GENERIC);
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}
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cost += (size_t)count[s] * bitCost;
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}
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return cost >> kAccuracyLog;
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}
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/**
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* Returns the cost in bits of encoding the distribution in count using the
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* table described by norm. The max symbol support by norm is assumed >= max.
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* norm must be valid for every symbol with non-zero probability in count.
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*/
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size_t ZSTD_crossEntropyCost(short const* norm, unsigned accuracyLog,
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unsigned const* count, unsigned const max)
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{
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unsigned const shift = 8 - accuracyLog;
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size_t cost = 0;
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unsigned s;
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assert(accuracyLog <= 8);
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for (s = 0; s <= max; ++s) {
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unsigned const normAcc = (norm[s] != -1) ? (unsigned)norm[s] : 1;
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unsigned const norm256 = normAcc << shift;
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assert(norm256 > 0);
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assert(norm256 < 256);
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cost += count[s] * kInverseProbabilityLog256[norm256];
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}
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return cost >> 8;
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}
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symbolEncodingType_e
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ZSTD_selectEncodingType(
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FSE_repeat* repeatMode, unsigned const* count, unsigned const max,
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size_t const mostFrequent, size_t nbSeq, unsigned const FSELog,
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FSE_CTable const* prevCTable,
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short const* defaultNorm, U32 defaultNormLog,
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ZSTD_defaultPolicy_e const isDefaultAllowed,
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ZSTD_strategy const strategy)
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{
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ZSTD_STATIC_ASSERT(ZSTD_defaultDisallowed == 0 && ZSTD_defaultAllowed != 0);
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if (mostFrequent == nbSeq) {
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*repeatMode = FSE_repeat_none;
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if (isDefaultAllowed && nbSeq <= 2) {
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/* Prefer set_basic over set_rle when there are 2 or fewer symbols,
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* since RLE uses 1 byte, but set_basic uses 5-6 bits per symbol.
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* If basic encoding isn't possible, always choose RLE.
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*/
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DEBUGLOG(5, "Selected set_basic");
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return set_basic;
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}
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DEBUGLOG(5, "Selected set_rle");
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return set_rle;
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}
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if (strategy < ZSTD_lazy) {
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if (isDefaultAllowed) {
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size_t const staticFse_nbSeq_max = 1000;
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size_t const mult = 10 - strategy;
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size_t const baseLog = 3;
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size_t const dynamicFse_nbSeq_min = (((size_t)1 << defaultNormLog) * mult) >> baseLog; /* 28-36 for offset, 56-72 for lengths */
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assert(defaultNormLog >= 5 && defaultNormLog <= 6); /* xx_DEFAULTNORMLOG */
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assert(mult <= 9 && mult >= 7);
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if ( (*repeatMode == FSE_repeat_valid)
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&& (nbSeq < staticFse_nbSeq_max) ) {
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DEBUGLOG(5, "Selected set_repeat");
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return set_repeat;
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}
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if ( (nbSeq < dynamicFse_nbSeq_min)
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|| (mostFrequent < (nbSeq >> (defaultNormLog-1))) ) {
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DEBUGLOG(5, "Selected set_basic");
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/* The format allows default tables to be repeated, but it isn't useful.
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* When using simple heuristics to select encoding type, we don't want
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* to confuse these tables with dictionaries. When running more careful
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* analysis, we don't need to waste time checking both repeating tables
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* and default tables.
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*/
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*repeatMode = FSE_repeat_none;
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return set_basic;
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}
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}
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} else {
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size_t const basicCost = isDefaultAllowed ? ZSTD_crossEntropyCost(defaultNorm, defaultNormLog, count, max) : ERROR(GENERIC);
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size_t const repeatCost = *repeatMode != FSE_repeat_none ? ZSTD_fseBitCost(prevCTable, count, max) : ERROR(GENERIC);
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size_t const NCountCost = ZSTD_NCountCost(count, max, nbSeq, FSELog);
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size_t const compressedCost = (NCountCost << 3) + ZSTD_entropyCost(count, max, nbSeq);
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if (isDefaultAllowed) {
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assert(!ZSTD_isError(basicCost));
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assert(!(*repeatMode == FSE_repeat_valid && ZSTD_isError(repeatCost)));
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}
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assert(!ZSTD_isError(NCountCost));
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assert(compressedCost < ERROR(maxCode));
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DEBUGLOG(5, "Estimated bit costs: basic=%u\trepeat=%u\tcompressed=%u",
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(unsigned)basicCost, (unsigned)repeatCost, (unsigned)compressedCost);
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if (basicCost <= repeatCost && basicCost <= compressedCost) {
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DEBUGLOG(5, "Selected set_basic");
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assert(isDefaultAllowed);
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*repeatMode = FSE_repeat_none;
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return set_basic;
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}
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if (repeatCost <= compressedCost) {
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DEBUGLOG(5, "Selected set_repeat");
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assert(!ZSTD_isError(repeatCost));
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return set_repeat;
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}
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assert(compressedCost < basicCost && compressedCost < repeatCost);
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}
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DEBUGLOG(5, "Selected set_compressed");
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*repeatMode = FSE_repeat_check;
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return set_compressed;
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}
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typedef struct {
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S16 norm[MaxSeq + 1];
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U32 wksp[FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(MaxSeq, MaxFSELog)];
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} ZSTD_BuildCTableWksp;
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size_t
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ZSTD_buildCTable(void* dst, size_t dstCapacity,
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FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type,
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unsigned* count, U32 max,
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const BYTE* codeTable, size_t nbSeq,
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const S16* defaultNorm, U32 defaultNormLog, U32 defaultMax,
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const FSE_CTable* prevCTable, size_t prevCTableSize,
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void* entropyWorkspace, size_t entropyWorkspaceSize)
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{
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BYTE* op = (BYTE*)dst;
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const BYTE* const oend = op + dstCapacity;
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DEBUGLOG(6, "ZSTD_buildCTable (dstCapacity=%u)", (unsigned)dstCapacity);
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switch (type) {
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case set_rle:
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FORWARD_IF_ERROR(FSE_buildCTable_rle(nextCTable, (BYTE)max), "");
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RETURN_ERROR_IF(dstCapacity==0, dstSize_tooSmall, "not enough space");
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*op = codeTable[0];
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return 1;
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case set_repeat:
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ZSTD_memcpy(nextCTable, prevCTable, prevCTableSize);
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return 0;
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case set_basic:
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FORWARD_IF_ERROR(FSE_buildCTable_wksp(nextCTable, defaultNorm, defaultMax, defaultNormLog, entropyWorkspace, entropyWorkspaceSize), ""); /* note : could be pre-calculated */
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return 0;
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case set_compressed: {
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ZSTD_BuildCTableWksp* wksp = (ZSTD_BuildCTableWksp*)entropyWorkspace;
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size_t nbSeq_1 = nbSeq;
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const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
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if (count[codeTable[nbSeq-1]] > 1) {
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count[codeTable[nbSeq-1]]--;
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nbSeq_1--;
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}
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assert(nbSeq_1 > 1);
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assert(entropyWorkspaceSize >= sizeof(ZSTD_BuildCTableWksp));
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(void)entropyWorkspaceSize;
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FORWARD_IF_ERROR(FSE_normalizeCount(wksp->norm, tableLog, count, nbSeq_1, max, ZSTD_useLowProbCount(nbSeq_1)), "FSE_normalizeCount failed");
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assert(oend >= op);
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{ size_t const NCountSize = FSE_writeNCount(op, (size_t)(oend - op), wksp->norm, max, tableLog); /* overflow protected */
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FORWARD_IF_ERROR(NCountSize, "FSE_writeNCount failed");
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FORWARD_IF_ERROR(FSE_buildCTable_wksp(nextCTable, wksp->norm, max, tableLog, wksp->wksp, sizeof(wksp->wksp)), "FSE_buildCTable_wksp failed");
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return NCountSize;
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}
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}
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default: assert(0); RETURN_ERROR(GENERIC, "impossible to reach");
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}
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}
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FORCE_INLINE_TEMPLATE size_t
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ZSTD_encodeSequences_body(
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void* dst, size_t dstCapacity,
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FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
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FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
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FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
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seqDef const* sequences, size_t nbSeq, int longOffsets)
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{
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BIT_CStream_t blockStream;
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FSE_CState_t stateMatchLength;
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FSE_CState_t stateOffsetBits;
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FSE_CState_t stateLitLength;
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RETURN_ERROR_IF(
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ERR_isError(BIT_initCStream(&blockStream, dst, dstCapacity)),
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dstSize_tooSmall, "not enough space remaining");
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DEBUGLOG(6, "available space for bitstream : %i (dstCapacity=%u)",
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(int)(blockStream.endPtr - blockStream.startPtr),
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(unsigned)dstCapacity);
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/* first symbols */
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FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]);
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FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]);
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FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]);
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BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]);
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if (MEM_32bits()) BIT_flushBits(&blockStream);
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BIT_addBits(&blockStream, sequences[nbSeq-1].mlBase, ML_bits[mlCodeTable[nbSeq-1]]);
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if (MEM_32bits()) BIT_flushBits(&blockStream);
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if (longOffsets) {
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U32 const ofBits = ofCodeTable[nbSeq-1];
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unsigned const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
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if (extraBits) {
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BIT_addBits(&blockStream, sequences[nbSeq-1].offBase, extraBits);
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BIT_flushBits(&blockStream);
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}
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BIT_addBits(&blockStream, sequences[nbSeq-1].offBase >> extraBits,
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ofBits - extraBits);
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} else {
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BIT_addBits(&blockStream, sequences[nbSeq-1].offBase, ofCodeTable[nbSeq-1]);
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}
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BIT_flushBits(&blockStream);
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{ size_t n;
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for (n=nbSeq-2 ; n<nbSeq ; n--) { /* intentional underflow */
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BYTE const llCode = llCodeTable[n];
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BYTE const ofCode = ofCodeTable[n];
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BYTE const mlCode = mlCodeTable[n];
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U32 const llBits = LL_bits[llCode];
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U32 const ofBits = ofCode;
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U32 const mlBits = ML_bits[mlCode];
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DEBUGLOG(6, "encoding: litlen:%2u - matchlen:%2u - offCode:%7u",
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(unsigned)sequences[n].litLength,
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(unsigned)sequences[n].mlBase + MINMATCH,
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(unsigned)sequences[n].offBase);
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/* 32b*/ /* 64b*/
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/* (7)*/ /* (7)*/
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FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */
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FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
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if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
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FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
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if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
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BIT_flushBits(&blockStream); /* (7)*/
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BIT_addBits(&blockStream, sequences[n].litLength, llBits);
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if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
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BIT_addBits(&blockStream, sequences[n].mlBase, mlBits);
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if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream);
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if (longOffsets) {
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unsigned const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
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if (extraBits) {
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BIT_addBits(&blockStream, sequences[n].offBase, extraBits);
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BIT_flushBits(&blockStream); /* (7)*/
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}
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BIT_addBits(&blockStream, sequences[n].offBase >> extraBits,
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ofBits - extraBits); /* 31 */
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} else {
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BIT_addBits(&blockStream, sequences[n].offBase, ofBits); /* 31 */
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}
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BIT_flushBits(&blockStream); /* (7)*/
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DEBUGLOG(7, "remaining space : %i", (int)(blockStream.endPtr - blockStream.ptr));
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} }
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DEBUGLOG(6, "ZSTD_encodeSequences: flushing ML state with %u bits", stateMatchLength.stateLog);
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FSE_flushCState(&blockStream, &stateMatchLength);
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DEBUGLOG(6, "ZSTD_encodeSequences: flushing Off state with %u bits", stateOffsetBits.stateLog);
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FSE_flushCState(&blockStream, &stateOffsetBits);
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DEBUGLOG(6, "ZSTD_encodeSequences: flushing LL state with %u bits", stateLitLength.stateLog);
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FSE_flushCState(&blockStream, &stateLitLength);
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{ size_t const streamSize = BIT_closeCStream(&blockStream);
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RETURN_ERROR_IF(streamSize==0, dstSize_tooSmall, "not enough space");
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return streamSize;
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}
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}
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static size_t
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ZSTD_encodeSequences_default(
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void* dst, size_t dstCapacity,
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FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
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FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
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FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
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seqDef const* sequences, size_t nbSeq, int longOffsets)
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{
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return ZSTD_encodeSequences_body(dst, dstCapacity,
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CTable_MatchLength, mlCodeTable,
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CTable_OffsetBits, ofCodeTable,
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CTable_LitLength, llCodeTable,
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sequences, nbSeq, longOffsets);
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}
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#if DYNAMIC_BMI2
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static BMI2_TARGET_ATTRIBUTE size_t
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ZSTD_encodeSequences_bmi2(
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void* dst, size_t dstCapacity,
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FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
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FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
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FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
|
|
seqDef const* sequences, size_t nbSeq, int longOffsets)
|
|
{
|
|
return ZSTD_encodeSequences_body(dst, dstCapacity,
|
|
CTable_MatchLength, mlCodeTable,
|
|
CTable_OffsetBits, ofCodeTable,
|
|
CTable_LitLength, llCodeTable,
|
|
sequences, nbSeq, longOffsets);
|
|
}
|
|
|
|
#endif
|
|
|
|
size_t ZSTD_encodeSequences(
|
|
void* dst, size_t dstCapacity,
|
|
FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
|
|
FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
|
|
FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
|
|
seqDef const* sequences, size_t nbSeq, int longOffsets, int bmi2)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_encodeSequences: dstCapacity = %u", (unsigned)dstCapacity);
|
|
#if DYNAMIC_BMI2
|
|
if (bmi2) {
|
|
return ZSTD_encodeSequences_bmi2(dst, dstCapacity,
|
|
CTable_MatchLength, mlCodeTable,
|
|
CTable_OffsetBits, ofCodeTable,
|
|
CTable_LitLength, llCodeTable,
|
|
sequences, nbSeq, longOffsets);
|
|
}
|
|
#endif
|
|
(void)bmi2;
|
|
return ZSTD_encodeSequences_default(dst, dstCapacity,
|
|
CTable_MatchLength, mlCodeTable,
|
|
CTable_OffsetBits, ofCodeTable,
|
|
CTable_LitLength, llCodeTable,
|
|
sequences, nbSeq, longOffsets);
|
|
}
|