2017-08-27 12:05:17 +02:00
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/*
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2017-06-09 03:43:56 +02:00
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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2017-08-27 12:05:17 +02:00
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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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2017-10-26 22:41:47 +02:00
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* You may select, at your option, one of the above-listed licenses.
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2017-06-09 03:43:56 +02:00
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*/
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#ifndef ZSTD_CCOMMON_H_MODULE
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#define ZSTD_CCOMMON_H_MODULE
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2018-01-13 13:50:59 +01:00
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/* this module contains definitions which must be identical
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* across compression, decompression and dictBuilder.
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* It also contains a few functions useful to at least 2 of them
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* and which benefit from being inlined */
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2017-06-09 03:43:56 +02:00
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/*-*************************************
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* Dependencies
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***************************************/
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2017-08-27 12:05:17 +02:00
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#include "compiler.h"
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2017-06-09 03:43:56 +02:00
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#include "mem.h"
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2019-01-04 01:30:03 +01:00
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#include "debug.h" /* assert, DEBUGLOG, RAWLOG, g_debuglevel */
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2017-06-09 03:43:56 +02:00
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#include "error_private.h"
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#define ZSTD_STATIC_LINKING_ONLY
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#include "zstd.h"
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2017-08-27 12:05:17 +02:00
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#define FSE_STATIC_LINKING_ONLY
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#include "fse.h"
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#define HUF_STATIC_LINKING_ONLY
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#include "huf.h"
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2017-06-09 03:43:56 +02:00
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#ifndef XXH_STATIC_LINKING_ONLY
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2017-07-22 23:46:05 +02:00
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# define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */
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#endif
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#include "xxhash.h" /* XXH_reset, update, digest */
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2017-10-26 22:41:47 +02:00
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#if defined (__cplusplus)
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extern "C" {
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#endif
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2019-01-04 01:30:03 +01:00
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/* ---- static assert (debug) --- */
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#define ZSTD_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c)
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#define ZSTD_isError ERR_isError /* for inlining */
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#define FSE_isError ERR_isError
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#define HUF_isError ERR_isError
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2017-06-09 03:43:56 +02:00
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/*-*************************************
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* shared macros
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***************************************/
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#undef MIN
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#undef MAX
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#define MIN(a,b) ((a)<(b) ? (a) : (b))
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#define MAX(a,b) ((a)>(b) ? (a) : (b))
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2019-04-18 11:53:29 +02:00
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/**
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* Return the specified error if the condition evaluates to true.
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*
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* In debug modes, prints additional information. In order to do that
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* (particularly, printing the conditional that failed), this can't just wrap
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* RETURN_ERROR().
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*/
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#define RETURN_ERROR_IF(cond, err, ...) \
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if (cond) { \
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RAWLOG(3, "%s:%d: ERROR!: check %s failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \
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RAWLOG(3, ": " __VA_ARGS__); \
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RAWLOG(3, "\n"); \
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return ERROR(err); \
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}
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/**
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* Unconditionally return the specified error.
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*
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* In debug modes, prints additional information.
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*/
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#define RETURN_ERROR(err, ...) \
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do { \
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RAWLOG(3, "%s:%d: ERROR!: unconditional check failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(ERROR(err))); \
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RAWLOG(3, ": " __VA_ARGS__); \
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RAWLOG(3, "\n"); \
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return ERROR(err); \
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} while(0);
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/**
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* If the provided expression evaluates to an error code, returns that error code.
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*
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* In debug modes, prints additional information.
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*/
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#define FORWARD_IF_ERROR(err, ...) \
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do { \
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size_t const err_code = (err); \
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if (ERR_isError(err_code)) { \
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RAWLOG(3, "%s:%d: ERROR!: forwarding error in %s: %s", __FILE__, __LINE__, ZSTD_QUOTE(err), ERR_getErrorName(err_code)); \
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RAWLOG(3, ": " __VA_ARGS__); \
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RAWLOG(3, "\n"); \
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return err_code; \
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} \
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} while(0);
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2017-06-09 03:43:56 +02:00
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/*-*************************************
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* Common constants
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***************************************/
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#define ZSTD_OPT_NUM (1<<12)
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#define ZSTD_REP_NUM 3 /* number of repcodes */
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#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
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static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 };
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#define KB *(1 <<10)
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#define MB *(1 <<20)
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#define GB *(1U<<30)
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#define BIT7 128
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#define BIT6 64
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#define BIT5 32
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#define BIT4 16
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#define BIT1 2
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#define BIT0 1
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#define ZSTD_WINDOWLOG_ABSOLUTEMIN 10
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static const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 };
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static const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 };
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2019-01-04 01:30:03 +01:00
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#define ZSTD_FRAMEIDSIZE 4 /* magic number size */
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2017-10-26 22:41:47 +02:00
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2017-06-09 03:43:56 +02:00
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#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */
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static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE;
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typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e;
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#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */
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#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */
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#define HufLog 12
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typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e;
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#define LONGNBSEQ 0x7F00
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#define MINMATCH 3
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#define Litbits 8
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#define MaxLit ((1<<Litbits) - 1)
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2018-05-15 19:45:22 +02:00
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#define MaxML 52
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#define MaxLL 35
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2017-10-26 22:41:47 +02:00
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#define DefaultMaxOff 28
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2018-05-15 19:45:22 +02:00
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#define MaxOff 31
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2017-06-09 03:43:56 +02:00
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#define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
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#define MLFSELog 9
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#define LLFSELog 9
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#define OffFSELog 8
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2018-05-15 19:45:22 +02:00
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#define MaxFSELog MAX(MAX(MLFSELog, LLFSELog), OffFSELog)
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2017-06-09 03:43:56 +02:00
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2018-01-13 13:50:59 +01:00
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static const U32 LL_bits[MaxLL+1] = { 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3,
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4, 6, 7, 8, 9,10,11,12,
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2017-06-09 03:43:56 +02:00
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13,14,15,16 };
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2018-01-13 13:50:59 +01:00
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static const S16 LL_defaultNorm[MaxLL+1] = { 4, 3, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 1, 1, 1,
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2, 2, 2, 2, 2, 2, 2, 2,
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2, 3, 2, 1, 1, 1, 1, 1,
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2017-06-09 03:43:56 +02:00
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-1,-1,-1,-1 };
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#define LL_DEFAULTNORMLOG 6 /* for static allocation */
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static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG;
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2018-01-13 13:50:59 +01:00
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static const U32 ML_bits[MaxML+1] = { 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3,
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4, 4, 5, 7, 8, 9,10,11,
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2017-06-09 03:43:56 +02:00
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12,13,14,15,16 };
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2018-01-13 13:50:59 +01:00
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static const S16 ML_defaultNorm[MaxML+1] = { 1, 4, 3, 2, 2, 2, 2, 2,
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2, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1,-1,-1,
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2017-06-09 03:43:56 +02:00
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-1,-1,-1,-1,-1 };
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#define ML_DEFAULTNORMLOG 6 /* for static allocation */
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static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG;
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2018-01-13 13:50:59 +01:00
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static const S16 OF_defaultNorm[DefaultMaxOff+1] = { 1, 1, 1, 1, 1, 1, 2, 2,
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2, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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-1,-1,-1,-1,-1 };
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2017-06-09 03:43:56 +02:00
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#define OF_DEFAULTNORMLOG 5 /* for static allocation */
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static const U32 OF_defaultNormLog = OF_DEFAULTNORMLOG;
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/*-*******************************************
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* Shared functions to include for inlining
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*********************************************/
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static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); }
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2019-07-20 20:47:07 +02:00
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2017-06-09 03:43:56 +02:00
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#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
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2019-07-20 20:47:07 +02:00
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static void ZSTD_copy16(void* dst, const void* src) { memcpy(dst, src, 16); }
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#define COPY16(d,s) { ZSTD_copy16(d,s); d+=16; s+=16; }
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#define WILDCOPY_OVERLENGTH 8
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#define VECLEN 16
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typedef enum {
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ZSTD_no_overlap,
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ZSTD_overlap_src_before_dst,
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/* ZSTD_overlap_dst_before_src, */
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} ZSTD_overlap_e;
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2017-06-09 03:43:56 +02:00
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/*! ZSTD_wildcopy() :
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2018-01-13 13:50:59 +01:00
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* custom version of memcpy(), can overwrite up to WILDCOPY_OVERLENGTH bytes (if length==0) */
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2019-07-20 20:47:07 +02:00
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MEM_STATIC FORCE_INLINE_ATTR DONT_VECTORIZE
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void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length, ZSTD_overlap_e ovtype)
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2017-06-09 03:43:56 +02:00
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{
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2019-07-20 20:47:07 +02:00
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ptrdiff_t diff = (BYTE*)dst - (const BYTE*)src;
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2017-06-09 03:43:56 +02:00
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const BYTE* ip = (const BYTE*)src;
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BYTE* op = (BYTE*)dst;
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BYTE* const oend = op + length;
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2019-07-20 20:47:07 +02:00
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assert(diff >= 8 || (ovtype == ZSTD_no_overlap && diff < -8));
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if (length < VECLEN || (ovtype == ZSTD_overlap_src_before_dst && diff < VECLEN)) {
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do
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COPY8(op, ip)
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while (op < oend);
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}
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else {
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if ((length & 8) == 0)
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COPY8(op, ip);
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do {
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COPY16(op, ip);
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}
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while (op < oend);
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}
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}
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/*! ZSTD_wildcopy_16min() :
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* same semantics as ZSTD_wilcopy() except guaranteed to be able to copy 16 bytes at the start */
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MEM_STATIC FORCE_INLINE_ATTR DONT_VECTORIZE
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void ZSTD_wildcopy_16min(void* dst, const void* src, ptrdiff_t length, ZSTD_overlap_e ovtype)
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{
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ptrdiff_t diff = (BYTE*)dst - (const BYTE*)src;
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const BYTE* ip = (const BYTE*)src;
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BYTE* op = (BYTE*)dst;
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BYTE* const oend = op + length;
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assert(length >= 8);
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assert(diff >= 8 || (ovtype == ZSTD_no_overlap && diff < -8));
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if (ovtype == ZSTD_overlap_src_before_dst && diff < VECLEN) {
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do
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COPY8(op, ip)
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while (op < oend);
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}
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else {
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if ((length & 8) == 0)
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COPY8(op, ip);
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do {
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COPY16(op, ip);
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}
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while (op < oend);
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}
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2017-06-09 03:43:56 +02:00
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}
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MEM_STATIC void ZSTD_wildcopy_e(void* dst, const void* src, void* dstEnd) /* should be faster for decoding, but strangely, not verified on all platform */
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{
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const BYTE* ip = (const BYTE*)src;
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BYTE* op = (BYTE*)dst;
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BYTE* const oend = (BYTE*)dstEnd;
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do
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COPY8(op, ip)
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while (op < oend);
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}
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/*-*******************************************
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2018-01-13 13:50:59 +01:00
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* Private declarations
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2017-06-09 03:43:56 +02:00
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*********************************************/
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typedef struct seqDef_s {
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U32 offset;
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U16 litLength;
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U16 matchLength;
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} seqDef;
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typedef struct {
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seqDef* sequencesStart;
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seqDef* sequences;
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BYTE* litStart;
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BYTE* lit;
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BYTE* llCode;
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BYTE* mlCode;
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BYTE* ofCode;
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2019-01-04 01:30:03 +01:00
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size_t maxNbSeq;
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size_t maxNbLit;
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2017-06-09 03:43:56 +02:00
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U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
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U32 longLengthPos;
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2017-08-27 12:05:17 +02:00
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} seqStore_t;
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2019-04-18 11:53:29 +02:00
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/**
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* Contains the compressed frame size and an upper-bound for the decompressed frame size.
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* Note: before using `compressedSize`, check for errors using ZSTD_isError().
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* similarly, before using `decompressedBound`, check for errors using:
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* `decompressedBound != ZSTD_CONTENTSIZE_ERROR`
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*/
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typedef struct {
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size_t compressedSize;
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unsigned long long decompressedBound;
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} ZSTD_frameSizeInfo; /* decompress & legacy */
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2018-01-13 13:50:59 +01:00
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const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx); /* compress & dictBuilder */
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void ZSTD_seqToCodes(const seqStore_t* seqStorePtr); /* compress, dictBuilder, decodeCorpus (shouldn't get its definition from here) */
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2017-06-09 03:43:56 +02:00
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/* custom memory allocation functions */
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void* ZSTD_malloc(size_t size, ZSTD_customMem customMem);
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2017-07-22 23:46:05 +02:00
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void* ZSTD_calloc(size_t size, ZSTD_customMem customMem);
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2017-06-09 03:43:56 +02:00
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void ZSTD_free(void* ptr, ZSTD_customMem customMem);
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2018-01-13 13:50:59 +01:00
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MEM_STATIC U32 ZSTD_highbit32(U32 val) /* compress, dictBuilder, decodeCorpus */
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2017-06-09 03:43:56 +02:00
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{
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2017-10-26 22:41:47 +02:00
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assert(val != 0);
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{
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2017-06-09 03:43:56 +02:00
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# if defined(_MSC_VER) /* Visual */
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2017-10-26 22:41:47 +02:00
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unsigned long r=0;
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_BitScanReverse(&r, val);
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return (unsigned)r;
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2017-06-09 03:43:56 +02:00
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# elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */
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2017-10-26 22:41:47 +02:00
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return 31 - __builtin_clz(val);
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2017-06-09 03:43:56 +02:00
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# else /* Software version */
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2018-01-13 13:50:59 +01:00
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static const U32 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 };
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2017-10-26 22:41:47 +02:00
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U32 v = val;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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2018-01-13 13:50:59 +01:00
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return DeBruijnClz[(v * 0x07C4ACDDU) >> 27];
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2017-06-09 03:43:56 +02:00
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# endif
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2017-10-26 22:41:47 +02:00
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}
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2017-06-09 03:43:56 +02:00
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}
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/* ZSTD_invalidateRepCodes() :
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* ensures next compression will not use repcodes from previous block.
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* Note : only works with regular variant;
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* do not use with extDict variant ! */
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2018-01-13 13:50:59 +01:00
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void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx); /* zstdmt, adaptive_compression (shouldn't get this definition from here) */
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2017-07-22 23:46:05 +02:00
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2017-07-25 19:49:57 +02:00
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typedef struct {
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blockType_e blockType;
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U32 lastBlock;
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U32 origSize;
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2019-01-04 01:30:03 +01:00
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} blockProperties_t; /* declared here for decompress and fullbench */
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2017-07-25 19:49:57 +02:00
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/*! ZSTD_getcBlockSize() :
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2018-01-13 13:50:59 +01:00
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* Provides the size of compressed block from block header `src` */
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/* Used by: decompress, fullbench (does not get its definition from here) */
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2017-08-27 12:05:17 +02:00
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size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
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blockProperties_t* bpPtr);
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2017-07-25 19:49:57 +02:00
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2019-01-04 01:30:03 +01:00
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/*! ZSTD_decodeSeqHeaders() :
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* decode sequence header from src */
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/* Used by: decompress, fullbench (does not get its definition from here) */
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size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
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const void* src, size_t srcSize);
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2017-10-26 22:41:47 +02:00
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#if defined (__cplusplus)
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}
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#endif
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2017-07-25 19:49:57 +02:00
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2017-06-09 03:43:56 +02:00
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#endif /* ZSTD_CCOMMON_H_MODULE */
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