137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/*
|
|
zstd_internal - common functions to include
|
|
Header File for include
|
|
Copyright (C) 2014-2015, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- zstd source repository : https://github.com/Cyan4973/zstd
|
|
- ztsd public forum : https://groups.google.com/forum/#!forum/lz4c
|
|
*/
|
|
#ifndef ZSTD_CCOMMON_H_MODULE
|
|
#define ZSTD_CCOMMON_H_MODULE
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* *************************************
|
|
* Includes
|
|
***************************************/
|
|
#include "mem.h"
|
|
#include "error_private.h"
|
|
#include "zstd_static.h"
|
|
|
|
|
|
/* *************************************
|
|
* Common macros
|
|
***************************************/
|
|
#define MIN(a,b) ((a)<(b) ? (a) : (b))
|
|
#define MAX(a,b) ((a)>(b) ? (a) : (b))
|
|
|
|
|
|
/* *************************************
|
|
* Common constants
|
|
***************************************/
|
|
#define ZSTD_MAGICNUMBER 0xFD2FB525 /* v0.5 */
|
|
#define ZSTD_DICT_MAGIC 0xEC30A435
|
|
|
|
#define KB *(1 <<10)
|
|
#define MB *(1 <<20)
|
|
#define GB *(1U<<30)
|
|
|
|
#define BLOCKSIZE (128 KB) /* define, for static allocation */
|
|
|
|
static const size_t ZSTD_blockHeaderSize = 3;
|
|
static const size_t ZSTD_frameHeaderSize_min = 5;
|
|
#define ZSTD_frameHeaderSize_max 5 /* define, for static allocation */
|
|
|
|
#define BIT7 128
|
|
#define BIT6 64
|
|
#define BIT5 32
|
|
#define BIT4 16
|
|
#define BIT1 2
|
|
#define BIT0 1
|
|
|
|
#define IS_HUF 0
|
|
#define IS_PCH 1
|
|
#define IS_RAW 2
|
|
#define IS_RLE 3
|
|
|
|
#define MINMATCH 4
|
|
#define REPCODE_STARTVALUE 1
|
|
|
|
#define MLbits 7
|
|
#define LLbits 6
|
|
#define Offbits 5
|
|
#define MaxML ((1<<MLbits) - 1)
|
|
#define MaxLL ((1<<LLbits) - 1)
|
|
#define MaxOff ((1<<Offbits)- 1)
|
|
#define MLFSELog 10
|
|
#define LLFSELog 10
|
|
#define OffFSELog 9
|
|
#define MaxSeq MAX(MaxLL, MaxML)
|
|
|
|
#define FSE_ENCODING_RAW 0
|
|
#define FSE_ENCODING_RLE 1
|
|
#define FSE_ENCODING_STATIC 2
|
|
#define FSE_ENCODING_DYNAMIC 3
|
|
|
|
|
|
#define HufLog 12
|
|
|
|
#define MIN_SEQUENCES_SIZE 1 /* seqNb */
|
|
#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + MIN_SEQUENCES_SIZE)
|
|
|
|
#define WILDCOPY_OVERLENGTH 8
|
|
|
|
typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t;
|
|
|
|
|
|
/*-*******************************************
|
|
* Shared functions to include for inlining
|
|
*********************************************/
|
|
static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); }
|
|
|
|
#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
|
|
|
|
/*! ZSTD_wildcopy : custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */
|
|
MEM_STATIC void ZSTD_wildcopy(void* dst, const void* src, size_t length)
|
|
{
|
|
const BYTE* ip = (const BYTE*)src;
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE* const oend = op + length;
|
|
do
|
|
COPY8(op, ip)
|
|
while (op < oend);
|
|
}
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTD_CCOMMON_H_MODULE */
|