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/*
* bzip2 is written by Julian Seward <jseward@bzip.org>.
* Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
* See README and LICENSE files in this directory for more information.
*/
/*-------------------------------------------------------------*/
/*--- Private header file for the library. ---*/
/*--- bzlib_private.h ---*/
/*-------------------------------------------------------------*/
/* ------------------------------------------------------------------
This file is part of bzip2/libbzip2, a program and library for
lossless, block-sorting data compression.
bzip2/libbzip2 version 1.0.4 of 20 December 2006
Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
Please read the WARNING, DISCLAIMER and PATENTS sections in the
README file.
This program is released under the terms of the license contained
in the file LICENSE.
------------------------------------------------------------------ */
/* #include "bzlib.h" */
#define BZ_DEBUG 0
//#define BZ_NO_STDIO 1 - does not work
/*-- General stuff. --*/
typedef unsigned char Bool;
typedef unsigned char UChar;
#define True ((Bool)1)
#define False ((Bool)0)
static void bz_assert_fail(int errcode) ATTRIBUTE_NORETURN;
#define AssertH(cond, errcode) \
{ \
if (!(cond)) \
bz_assert_fail(errcode); \
}
#if BZ_DEBUG
#define AssertD(cond, msg) \
{ \
if (!(cond)) \
bb_error_msg_and_die("(debug build): internal error %s", msg); \
}
#else
#define AssertD(cond, msg) do { } while (0)
#endif
/*-- Header bytes. --*/
#define BZ_HDR_B 0x42 /* 'B' */
#define BZ_HDR_Z 0x5a /* 'Z' */
#define BZ_HDR_h 0x68 /* 'h' */
#define BZ_HDR_0 0x30 /* '0' */
#define BZ_HDR_BZh0 0x425a6830
/*-- Constants for the back end. --*/
#define BZ_MAX_ALPHA_SIZE 258
#define BZ_MAX_CODE_LEN 23
#define BZ_RUNA 0
#define BZ_RUNB 1
#define BZ_N_GROUPS 6
#define BZ_G_SIZE 50
#define BZ_N_ITERS 4
#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
/*-- Stuff for randomising repetitive blocks. --*/
static const int32_t BZ2_rNums[512];
#define BZ_RAND_DECLS \
int32_t rNToGo; \
int32_t rTPos \
#define BZ_RAND_INIT_MASK \
s->rNToGo = 0; \
s->rTPos = 0 \
#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
#define BZ_RAND_UPD_MASK \
{ \
if (s->rNToGo == 0) { \
s->rNToGo = BZ2_rNums[s->rTPos]; \
s->rTPos++; \
if (s->rTPos == 512) s->rTPos = 0; \
} \
s->rNToGo--; \
}
/*-- Stuff for doing CRCs. --*/
static const uint32_t BZ2_crc32Table[256];
#define BZ_INITIALISE_CRC(crcVar) \
{ \
crcVar = 0xffffffffL; \
}
#define BZ_FINALISE_CRC(crcVar) \
{ \
crcVar = ~(crcVar); \
}
#define BZ_UPDATE_CRC(crcVar,cha) \
{ \
crcVar = (crcVar << 8) ^ BZ2_crc32Table[(crcVar >> 24) ^ ((UChar)cha)]; \
}
/*-- States and modes for compression. --*/
#define BZ_M_IDLE 1
#define BZ_M_RUNNING 2
#define BZ_M_FLUSHING 3
#define BZ_M_FINISHING 4
#define BZ_S_OUTPUT 1
#define BZ_S_INPUT 2
#define BZ_N_RADIX 2
#define BZ_N_QSORT 12
#define BZ_N_SHELL 18
#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
/*-- Structure holding all the compression-side stuff. --*/
typedef struct EState {
/* pointer back to the struct bz_stream */
bz_stream *strm;
/* mode this stream is in, and whether inputting */
/* or outputting data */
int32_t mode;
int32_t state;
/* remembers avail_in when flush/finish requested */
uint32_t avail_in_expect; //vda: do we need this?
/* for doing the block sorting */
uint32_t *arr1;
uint32_t *arr2;
uint32_t *ftab;
int32_t origPtr;
/* aliases for arr1 and arr2 */
uint32_t *ptr;
UChar *block;
uint16_t *mtfv;
UChar *zbits;
/* run-length-encoding of the input */
uint32_t state_in_ch;
int32_t state_in_len;
BZ_RAND_DECLS;
/* input and output limits and current posns */
int32_t nblock;
int32_t nblockMAX;
int32_t numZ;
int32_t state_out_pos;
/* the buffer for bit stream creation */
uint32_t bsBuff;
int32_t bsLive;
/* block and combined CRCs */
uint32_t blockCRC;
uint32_t combinedCRC;
/* misc administratium */
int32_t blockNo;
int32_t blockSize100k;
/* stuff for coding the MTF values */
int32_t nMTF;
/* map of bytes used in block */
int32_t nInUse;
Bool inUse[256];
UChar unseqToSeq[256];
/* stuff for coding the MTF values */
int32_t mtfFreq [BZ_MAX_ALPHA_SIZE];
UChar selector [BZ_MAX_SELECTORS];
UChar selectorMtf[BZ_MAX_SELECTORS];
UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
int32_t code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
int32_t rfreq [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
#ifdef FAST_GROUP6
/* second dimension: only 3 needed; 4 makes index calculations faster */
uint32_t len_pack[BZ_MAX_ALPHA_SIZE][4];
#endif
} EState;
/*-- compression. --*/
static void
BZ2_blockSort(EState*);
static void
BZ2_compressBlock(EState*, Bool);
static void
BZ2_bsInitWrite(EState*);
static void
BZ2_hbAssignCodes(int32_t*, UChar*, int32_t, int32_t, int32_t);
static void
BZ2_hbMakeCodeLengths(UChar*, int32_t*, int32_t, int32_t);
/*-------------------------------------------------------------*/
/*--- end bzlib_private.h ---*/
/*-------------------------------------------------------------*/
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