123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/*
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zstd_internal - common functions to include
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Header File for include
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Copyright (C) 2014-2015, 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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- zstd source repository : https://github.com/Cyan4973/zstd
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- ztsd public forum : https://groups.google.com/forum/#!forum/lz4c
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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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#if defined (__cplusplus)
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extern "C" {
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#endif
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/* *************************************
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* Includes
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***************************************/
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#include "mem.h"
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#include "error.h"
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/* *************************************
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* Common macros
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***************************************/
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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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/* *************************************
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* Common constants
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***************************************/
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#define ZSTD_MAGICNUMBER 0xFD2FB524 /* v0.4 */
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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 BLOCKSIZE (128 KB) /* define, for static allocation */
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static const size_t ZSTD_blockHeaderSize = 3;
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static const size_t ZSTD_frameHeaderSize_min = 5;
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#define ZSTD_frameHeaderSize_max 5 /* define, for static allocation */
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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 IS_RAW BIT0
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#define IS_RLE BIT1
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#define MINMATCH 4
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#define REPCODE_STARTVALUE 4
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#define MLbits 7
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#define LLbits 6
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#define Offbits 5
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#define MaxML ((1<<MLbits) - 1)
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#define MaxLL ((1<<LLbits) - 1)
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#define MaxOff ((1<<Offbits)- 1)
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#define MLFSELog 10
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#define LLFSELog 10
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#define OffFSELog 9
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#define MaxSeq MAX(MaxLL, MaxML)
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#define MIN_SEQUENCES_SIZE (2 /*seqNb*/ + 2 /*dumps*/ + 3 /*seqTables*/ + 1 /*bitStream*/)
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#define MIN_CBLOCK_SIZE (3 /*litCSize*/ + MIN_SEQUENCES_SIZE)
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typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t;
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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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#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
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/*! ZSTD_wildcopy : custom version of memcpy(), can copy up to 7-8 bytes too many */
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static void ZSTD_wildcopy(void* dst, const void* src, size_t length)
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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 = op + length;
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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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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTD_CCOMMON_H_MODULE */
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