Upgrade versions of vendored libs
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211
vendor/github.com/DataDog/zstd/fse_decompress.c
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vendored
211
vendor/github.com/DataDog/zstd/fse_decompress.c
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vendored
@@ -1,48 +1,30 @@
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#ifndef USE_EXTERNAL_ZSTD
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/* ******************************************************************
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FSE : Finite State Entropy decoder
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Copyright (C) 2013-2015, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
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- Public forum : https://groups.google.com/forum/#!forum/lz4c
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* FSE : Finite State Entropy decoder
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* Copyright (c) Yann Collet, Facebook, Inc.
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*
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* You can contact the author at :
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* - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
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* - Public forum : https://groups.google.com/forum/#!forum/lz4c
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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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* Includes
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****************************************************************/
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#include <stdlib.h> /* malloc, free, qsort */
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#include <string.h> /* memcpy, memset */
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#include "debug.h" /* assert */
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#include "bitstream.h"
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#include "compiler.h"
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#define FSE_STATIC_LINKING_ONLY
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#include "fse.h"
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#include "error_private.h"
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#define ZSTD_DEPS_NEED_MALLOC
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#include "zstd_deps.h"
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/* **************************************************************
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@@ -51,11 +33,6 @@
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#define FSE_isError ERR_isError
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#define FSE_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c) /* use only *after* variable declarations */
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/* check and forward error code */
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#ifndef CHECK_F
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#define CHECK_F(f) { size_t const e = f; if (FSE_isError(e)) return e; }
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#endif
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/* **************************************************************
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* Templates
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@@ -84,25 +61,27 @@
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FSE_DTable* FSE_createDTable (unsigned tableLog)
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{
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if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX;
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return (FSE_DTable*)malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) );
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return (FSE_DTable*)ZSTD_malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) );
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}
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void FSE_freeDTable (FSE_DTable* dt)
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{
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free(dt);
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ZSTD_free(dt);
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}
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size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
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static size_t FSE_buildDTable_internal(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize)
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{
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void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */
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FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (tdPtr);
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U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1];
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U16* symbolNext = (U16*)workSpace;
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BYTE* spread = (BYTE*)(symbolNext + maxSymbolValue + 1);
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U32 const maxSV1 = maxSymbolValue + 1;
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U32 const tableSize = 1 << tableLog;
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U32 highThreshold = tableSize-1;
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/* Sanity Checks */
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if (FSE_BUILD_DTABLE_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(maxSymbolValue_tooLarge);
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if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge);
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if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge);
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@@ -120,11 +99,57 @@ size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned
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if (normalizedCounter[s] >= largeLimit) DTableH.fastMode=0;
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symbolNext[s] = normalizedCounter[s];
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} } }
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memcpy(dt, &DTableH, sizeof(DTableH));
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ZSTD_memcpy(dt, &DTableH, sizeof(DTableH));
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}
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/* Spread symbols */
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{ U32 const tableMask = tableSize-1;
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if (highThreshold == tableSize - 1) {
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size_t const tableMask = tableSize-1;
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size_t const step = FSE_TABLESTEP(tableSize);
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/* First lay down the symbols in order.
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* We use a uint64_t to lay down 8 bytes at a time. This reduces branch
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* misses since small blocks generally have small table logs, so nearly
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* all symbols have counts <= 8. We ensure we have 8 bytes at the end of
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* our buffer to handle the over-write.
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*/
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{
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U64 const add = 0x0101010101010101ull;
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size_t pos = 0;
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U64 sv = 0;
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U32 s;
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for (s=0; s<maxSV1; ++s, sv += add) {
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int i;
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int const n = normalizedCounter[s];
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MEM_write64(spread + pos, sv);
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for (i = 8; i < n; i += 8) {
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MEM_write64(spread + pos + i, sv);
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}
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pos += n;
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}
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}
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/* Now we spread those positions across the table.
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* The benefit of doing it in two stages is that we avoid the the
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* variable size inner loop, which caused lots of branch misses.
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* Now we can run through all the positions without any branch misses.
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* We unroll the loop twice, since that is what emperically worked best.
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*/
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{
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size_t position = 0;
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size_t s;
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size_t const unroll = 2;
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assert(tableSize % unroll == 0); /* FSE_MIN_TABLELOG is 5 */
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for (s = 0; s < (size_t)tableSize; s += unroll) {
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size_t u;
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for (u = 0; u < unroll; ++u) {
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size_t const uPosition = (position + (u * step)) & tableMask;
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tableDecode[uPosition].symbol = spread[s + u];
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}
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position = (position + (unroll * step)) & tableMask;
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}
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assert(position == 0);
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}
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} else {
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U32 const tableMask = tableSize-1;
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U32 const step = FSE_TABLESTEP(tableSize);
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U32 s, position = 0;
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for (s=0; s<maxSV1; s++) {
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@@ -149,6 +174,11 @@ size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned
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return 0;
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}
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size_t FSE_buildDTable_wksp(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize)
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{
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return FSE_buildDTable_internal(dt, normalizedCounter, maxSymbolValue, tableLog, workSpace, wkspSize);
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}
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#ifndef FSE_COMMONDEFS_ONLY
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@@ -276,36 +306,101 @@ size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
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}
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size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, FSE_DTable* workSpace, unsigned maxLog)
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size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
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{
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return FSE_decompress_wksp_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, /* bmi2 */ 0);
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}
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typedef struct {
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short ncount[FSE_MAX_SYMBOL_VALUE + 1];
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FSE_DTable dtable[1]; /* Dynamically sized */
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} FSE_DecompressWksp;
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FORCE_INLINE_TEMPLATE size_t FSE_decompress_wksp_body(
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void* dst, size_t dstCapacity,
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const void* cSrc, size_t cSrcSize,
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unsigned maxLog, void* workSpace, size_t wkspSize,
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int bmi2)
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{
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const BYTE* const istart = (const BYTE*)cSrc;
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const BYTE* ip = istart;
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short counting[FSE_MAX_SYMBOL_VALUE+1];
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unsigned tableLog;
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unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE;
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FSE_DecompressWksp* const wksp = (FSE_DecompressWksp*)workSpace;
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DEBUG_STATIC_ASSERT((FSE_MAX_SYMBOL_VALUE + 1) % 2 == 0);
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if (wkspSize < sizeof(*wksp)) return ERROR(GENERIC);
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/* normal FSE decoding mode */
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size_t const NCountLength = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize);
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if (FSE_isError(NCountLength)) return NCountLength;
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//if (NCountLength >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size; supposed to be already checked in NCountLength, only remaining case : NCountLength==cSrcSize */
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if (tableLog > maxLog) return ERROR(tableLog_tooLarge);
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ip += NCountLength;
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cSrcSize -= NCountLength;
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{
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size_t const NCountLength = FSE_readNCount_bmi2(wksp->ncount, &maxSymbolValue, &tableLog, istart, cSrcSize, bmi2);
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if (FSE_isError(NCountLength)) return NCountLength;
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if (tableLog > maxLog) return ERROR(tableLog_tooLarge);
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assert(NCountLength <= cSrcSize);
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ip += NCountLength;
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cSrcSize -= NCountLength;
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}
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CHECK_F( FSE_buildDTable (workSpace, counting, maxSymbolValue, tableLog) );
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if (FSE_DECOMPRESS_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(tableLog_tooLarge);
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workSpace = wksp->dtable + FSE_DTABLE_SIZE_U32(tableLog);
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wkspSize -= sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog);
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return FSE_decompress_usingDTable (dst, dstCapacity, ip, cSrcSize, workSpace); /* always return, even if it is an error code */
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CHECK_F( FSE_buildDTable_internal(wksp->dtable, wksp->ncount, maxSymbolValue, tableLog, workSpace, wkspSize) );
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{
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const void* ptr = wksp->dtable;
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const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr;
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const U32 fastMode = DTableH->fastMode;
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/* select fast mode (static) */
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if (fastMode) return FSE_decompress_usingDTable_generic(dst, dstCapacity, ip, cSrcSize, wksp->dtable, 1);
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return FSE_decompress_usingDTable_generic(dst, dstCapacity, ip, cSrcSize, wksp->dtable, 0);
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}
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}
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/* Avoids the FORCE_INLINE of the _body() function. */
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static size_t FSE_decompress_wksp_body_default(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
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{
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return FSE_decompress_wksp_body(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, 0);
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}
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#if DYNAMIC_BMI2
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BMI2_TARGET_ATTRIBUTE static size_t FSE_decompress_wksp_body_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
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{
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return FSE_decompress_wksp_body(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, 1);
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}
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#endif
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size_t FSE_decompress_wksp_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize, int bmi2)
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{
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#if DYNAMIC_BMI2
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if (bmi2) {
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return FSE_decompress_wksp_body_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize);
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}
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#endif
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(void)bmi2;
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return FSE_decompress_wksp_body_default(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize);
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}
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typedef FSE_DTable DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)];
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size_t FSE_decompress(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize)
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{
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DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */
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return FSE_decompress_wksp(dst, dstCapacity, cSrc, cSrcSize, dt, FSE_MAX_TABLELOG);
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#ifndef ZSTD_NO_UNUSED_FUNCTIONS
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size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) {
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U32 wksp[FSE_BUILD_DTABLE_WKSP_SIZE_U32(FSE_TABLELOG_ABSOLUTE_MAX, FSE_MAX_SYMBOL_VALUE)];
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return FSE_buildDTable_wksp(dt, normalizedCounter, maxSymbolValue, tableLog, wksp, sizeof(wksp));
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}
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size_t FSE_decompress(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize)
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{
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/* Static analyzer seems unable to understand this table will be properly initialized later */
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U32 wksp[FSE_DECOMPRESS_WKSP_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)];
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return FSE_decompress_wksp(dst, dstCapacity, cSrc, cSrcSize, FSE_MAX_TABLELOG, wksp, sizeof(wksp));
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}
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#endif
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#endif /* FSE_COMMONDEFS_ONLY */
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#endif /* USE_EXTERNAL_ZSTD */
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