[3320] | 1 | /*
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| 2 | * bzip2 is written by Julian Seward <jseward@bzip.org>.
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| 3 | * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
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| 4 | * See README and LICENSE files in this directory for more information.
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| 5 | */
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| 6 |
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| 7 | /*-------------------------------------------------------------*/
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| 8 | /*--- Private header file for the library. ---*/
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| 9 | /*--- bzlib_private.h ---*/
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| 10 | /*-------------------------------------------------------------*/
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| 11 |
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| 12 | /* ------------------------------------------------------------------
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| 13 | This file is part of bzip2/libbzip2, a program and library for
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| 14 | lossless, block-sorting data compression.
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| 15 |
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| 16 | bzip2/libbzip2 version 1.0.4 of 20 December 2006
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| 17 | Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
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| 18 |
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| 19 | Please read the WARNING, DISCLAIMER and PATENTS sections in the
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| 20 | README file.
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| 21 |
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| 22 | This program is released under the terms of the license contained
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| 23 | in the file LICENSE.
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| 24 | ------------------------------------------------------------------ */
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| 25 |
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| 26 | /* #include "bzlib.h" */
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| 27 |
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| 28 | /*-- General stuff. --*/
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| 29 |
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| 30 | typedef unsigned char Bool;
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| 31 |
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| 32 | #define True ((Bool)1)
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| 33 | #define False ((Bool)0)
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| 34 |
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| 35 | #if BZ_LIGHT_DEBUG
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| 36 | static void bz_assert_fail(int errcode) NORETURN;
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| 37 | #define AssertH(cond, errcode) \
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| 38 | do { \
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| 39 | if (!(cond)) \
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| 40 | bz_assert_fail(errcode); \
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| 41 | } while (0)
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| 42 | #else
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| 43 | #define AssertH(cond, msg) do { } while (0)
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| 44 | #endif
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| 45 |
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| 46 | #if BZ_DEBUG
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| 47 | #define AssertD(cond, msg) \
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| 48 | do { \
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| 49 | if (!(cond)) \
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| 50 | bb_error_msg_and_die("(debug build): internal error %s", msg); \
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| 51 | } while (0)
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| 52 | #else
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| 53 | #define AssertD(cond, msg) do { } while (0)
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| 54 | #endif
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| 55 |
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| 56 |
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| 57 | /*-- Header bytes. --*/
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| 58 |
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| 59 | #define BZ_HDR_B 0x42 /* 'B' */
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| 60 | #define BZ_HDR_Z 0x5a /* 'Z' */
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| 61 | #define BZ_HDR_h 0x68 /* 'h' */
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| 62 | #define BZ_HDR_0 0x30 /* '0' */
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| 63 |
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| 64 | #define BZ_HDR_BZh0 0x425a6830
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| 65 |
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| 66 | /*-- Constants for the back end. --*/
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| 67 |
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| 68 | #define BZ_MAX_ALPHA_SIZE 258
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| 69 | #define BZ_MAX_CODE_LEN 23
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| 70 |
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| 71 | #define BZ_RUNA 0
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| 72 | #define BZ_RUNB 1
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| 73 |
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| 74 | #define BZ_N_GROUPS 6
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| 75 | #define BZ_G_SIZE 50
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| 76 | #define BZ_N_ITERS 4
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| 77 |
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| 78 | #define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
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| 79 |
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| 80 |
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| 81 | /*-- Stuff for doing CRCs. --*/
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| 82 |
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| 83 | #define BZ_INITIALISE_CRC(crcVar) \
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| 84 | { \
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| 85 | crcVar = 0xffffffffL; \
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| 86 | }
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| 87 |
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| 88 | #define BZ_FINALISE_CRC(crcVar) \
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| 89 | { \
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| 90 | crcVar = ~(crcVar); \
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| 91 | }
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| 92 |
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| 93 | #define BZ_UPDATE_CRC(s, crcVar, cha) \
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| 94 | { \
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| 95 | crcVar = (crcVar << 8) ^ s->crc32table[(crcVar >> 24) ^ ((uint8_t)cha)]; \
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| 96 | }
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| 97 |
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| 98 |
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| 99 | /*-- States and modes for compression. --*/
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| 100 |
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| 101 | #define BZ_M_IDLE 1
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| 102 | #define BZ_M_RUNNING 2
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| 103 | #define BZ_M_FLUSHING 3
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| 104 | #define BZ_M_FINISHING 4
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| 105 |
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| 106 | #define BZ_S_OUTPUT 1
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| 107 | #define BZ_S_INPUT 2
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| 108 |
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| 109 | #define BZ_N_RADIX 2
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| 110 | #define BZ_N_QSORT 12
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| 111 | #define BZ_N_SHELL 18
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| 112 | #define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
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| 113 |
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| 114 |
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| 115 | /*-- Structure holding all the compression-side stuff. --*/
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| 116 |
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| 117 | typedef struct EState {
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| 118 | /* pointer back to the struct bz_stream */
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| 119 | bz_stream *strm;
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| 120 |
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| 121 | /* mode this stream is in, and whether inputting */
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| 122 | /* or outputting data */
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| 123 | int32_t mode;
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| 124 | int32_t state;
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| 125 |
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| 126 | /* remembers avail_in when flush/finish requested */
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| 127 | /* bbox: not needed, strm->avail_in always has the same value */
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| 128 | /* commented out with '//#' throughout the code */
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| 129 | /* uint32_t avail_in_expect; */
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| 130 |
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| 131 | /* for doing the block sorting */
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| 132 | int32_t origPtr;
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| 133 | uint32_t *arr1;
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| 134 | uint32_t *arr2;
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| 135 | uint32_t *ftab;
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| 136 |
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| 137 | /* aliases for arr1 and arr2 */
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| 138 | uint32_t *ptr;
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| 139 | uint8_t *block;
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| 140 | uint16_t *mtfv;
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| 141 | uint8_t *zbits;
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| 142 |
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| 143 | /* guess what */
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| 144 | uint32_t *crc32table;
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| 145 |
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| 146 | /* run-length-encoding of the input */
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| 147 | uint32_t state_in_ch;
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| 148 | int32_t state_in_len;
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| 149 |
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| 150 | /* input and output limits and current posns */
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| 151 | int32_t nblock;
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| 152 | int32_t nblockMAX;
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| 153 | int32_t numZ;
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| 154 | int32_t state_out_pos;
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| 155 |
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| 156 | /* the buffer for bit stream creation */
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| 157 | uint32_t bsBuff;
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| 158 | int32_t bsLive;
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| 159 |
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| 160 | /* block and combined CRCs */
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| 161 | uint32_t blockCRC;
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| 162 | uint32_t combinedCRC;
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| 163 |
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| 164 | /* misc administratium */
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| 165 | int32_t blockNo;
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| 166 | int32_t blockSize100k;
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| 167 |
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| 168 | /* stuff for coding the MTF values */
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| 169 | int32_t nMTF;
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| 170 |
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| 171 | /* map of bytes used in block */
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| 172 | int32_t nInUse;
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| 173 | Bool inUse[256] ALIGNED(sizeof(long));
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| 174 | uint8_t unseqToSeq[256];
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| 175 |
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| 176 | /* stuff for coding the MTF values */
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| 177 | int32_t mtfFreq [BZ_MAX_ALPHA_SIZE];
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| 178 | uint8_t selector [BZ_MAX_SELECTORS];
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| 179 | uint8_t selectorMtf[BZ_MAX_SELECTORS];
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| 180 |
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| 181 | uint8_t len[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 182 |
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| 183 | /* stack-saving measures: these can be local, but they are too big */
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| 184 | int32_t sendMTFValues__code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 185 | int32_t sendMTFValues__rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 186 | #if CONFIG_BZIP2_FEATURE_SPEED >= 5
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| 187 | /* second dimension: only 3 needed; 4 makes index calculations faster */
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| 188 | uint32_t sendMTFValues__len_pack[BZ_MAX_ALPHA_SIZE][4];
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| 189 | #endif
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| 190 | int32_t BZ2_hbMakeCodeLengths__heap [BZ_MAX_ALPHA_SIZE + 2];
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| 191 | int32_t BZ2_hbMakeCodeLengths__weight[BZ_MAX_ALPHA_SIZE * 2];
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| 192 | int32_t BZ2_hbMakeCodeLengths__parent[BZ_MAX_ALPHA_SIZE * 2];
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| 193 |
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| 194 | int32_t mainSort__runningOrder[256];
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| 195 | int32_t mainSort__copyStart[256];
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| 196 | int32_t mainSort__copyEnd[256];
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| 197 | } EState;
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| 198 |
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| 199 |
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| 200 | /*-- compression. --*/
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| 201 |
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| 202 | static void
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| 203 | BZ2_blockSort(EState*);
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| 204 |
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| 205 | static void
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| 206 | BZ2_compressBlock(EState*, int);
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| 207 |
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| 208 | static void
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| 209 | BZ2_bsInitWrite(EState*);
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| 210 |
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| 211 | static void
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| 212 | BZ2_hbAssignCodes(int32_t*, uint8_t*, int32_t, int32_t, int32_t);
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| 213 |
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| 214 | static void
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| 215 | BZ2_hbMakeCodeLengths(EState*, uint8_t*, int32_t*, int32_t, int32_t);
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| 216 |
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| 217 | /*-------------------------------------------------------------*/
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| 218 | /*--- end bzlib_private.h ---*/
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| 219 | /*-------------------------------------------------------------*/
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