/* * bzip2 is written by Julian Seward . * Adapted for busybox by Denys Vlasenko . * 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 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" */ /*-- General stuff. --*/ typedef unsigned char Bool; #define True ((Bool)1) #define False ((Bool)0) #if BZ_LIGHT_DEBUG static void bz_assert_fail(int errcode) NORETURN; #define AssertH(cond, errcode) \ do { \ if (!(cond)) \ bz_assert_fail(errcode); \ } while (0) #else #define AssertH(cond, msg) do { } while (0) #endif #if BZ_DEBUG #define AssertD(cond, msg) \ do { \ if (!(cond)) \ bb_error_msg_and_die("(debug build): internal error %s", msg); \ } while (0) #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 doing CRCs. --*/ #define BZ_INITIALISE_CRC(crcVar) \ { \ crcVar = 0xffffffffL; \ } #define BZ_FINALISE_CRC(crcVar) \ { \ crcVar = ~(crcVar); \ } #define BZ_UPDATE_CRC(s, crcVar, cha) \ { \ crcVar = (crcVar << 8) ^ s->crc32table[(crcVar >> 24) ^ ((uint8_t)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 */ /* bbox: not needed, strm->avail_in always has the same value */ /* commented out with '//#' throughout the code */ /* uint32_t avail_in_expect; */ /* for doing the block sorting */ int32_t origPtr; uint32_t *arr1; uint32_t *arr2; uint32_t *ftab; /* aliases for arr1 and arr2 */ uint32_t *ptr; uint8_t *block; uint16_t *mtfv; uint8_t *zbits; /* guess what */ uint32_t *crc32table; /* run-length-encoding of the input */ uint32_t state_in_ch; int32_t state_in_len; /* 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] ALIGNED(sizeof(long)); uint8_t unseqToSeq[256]; /* stuff for coding the MTF values */ int32_t mtfFreq [BZ_MAX_ALPHA_SIZE]; uint8_t selector [BZ_MAX_SELECTORS]; uint8_t selectorMtf[BZ_MAX_SELECTORS]; uint8_t len[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; /* stack-saving measures: these can be local, but they are too big */ int32_t sendMTFValues__code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; int32_t sendMTFValues__rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; #if CONFIG_BZIP2_FAST >= 5 /* second dimension: only 3 needed; 4 makes index calculations faster */ uint32_t sendMTFValues__len_pack[BZ_MAX_ALPHA_SIZE][4]; #endif int32_t BZ2_hbMakeCodeLengths__heap [BZ_MAX_ALPHA_SIZE + 2]; int32_t BZ2_hbMakeCodeLengths__weight[BZ_MAX_ALPHA_SIZE * 2]; int32_t BZ2_hbMakeCodeLengths__parent[BZ_MAX_ALPHA_SIZE * 2]; int32_t mainSort__runningOrder[256]; int32_t mainSort__copyStart[256]; int32_t mainSort__copyEnd[256]; } EState; /*-- compression. --*/ static void BZ2_blockSort(EState*); static void BZ2_compressBlock(EState*, int); static void BZ2_bsInitWrite(EState*); static void BZ2_hbAssignCodes(int32_t*, uint8_t*, int32_t, int32_t, int32_t); static void BZ2_hbMakeCodeLengths(EState*, uint8_t*, int32_t*, int32_t, int32_t); /*-------------------------------------------------------------*/ /*--- end bzlib_private.h ---*/ /*-------------------------------------------------------------*/