1 |
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2 | /*-------------------------------------------------------------*/
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3 | /*--- Private header file for the library. ---*/
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4 | /*--- bzlib_private.h ---*/
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5 | /*-------------------------------------------------------------*/
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6 |
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7 | /*--
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8 | This file is a part of bzip2 and/or libbzip2, a program and
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9 | library for lossless, block-sorting data compression.
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10 |
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11 | Copyright (C) 1996-2005 Julian R Seward. All rights reserved.
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12 |
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13 | Redistribution and use in source and binary forms, with or without
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14 | modification, are permitted provided that the following conditions
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15 | are met:
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16 |
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17 | 1. Redistributions of source code must retain the above copyright
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18 | notice, this list of conditions and the following disclaimer.
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19 |
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20 | 2. The origin of this software must not be misrepresented; you must
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21 | not claim that you wrote the original software. If you use this
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22 | software in a product, an acknowledgment in the product
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23 | documentation would be appreciated but is not required.
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24 |
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25 | 3. Altered source versions must be plainly marked as such, and must
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26 | not be misrepresented as being the original software.
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27 |
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28 | 4. The name of the author may not be used to endorse or promote
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29 | products derived from this software without specific prior written
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30 | permission.
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31 |
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32 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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33 | OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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34 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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35 | ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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36 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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38 | GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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39 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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40 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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41 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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42 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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43 |
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44 | Julian Seward, Cambridge, UK.
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45 | jseward@bzip.org
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46 | bzip2/libbzip2 version 1.0 of 21 March 2000
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47 |
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48 | This program is based on (at least) the work of:
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49 | Mike Burrows
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50 | David Wheeler
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51 | Peter Fenwick
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52 | Alistair Moffat
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53 | Radford Neal
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54 | Ian H. Witten
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55 | Robert Sedgewick
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56 | Jon L. Bentley
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57 |
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58 | For more information on these sources, see the manual.
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59 | --*/
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60 |
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61 |
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62 | #ifndef _BZLIB_PRIVATE_H
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63 | #define _BZLIB_PRIVATE_H
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64 |
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65 | #include <stdlib.h>
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66 |
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67 | #ifndef BZ_NO_STDIO
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68 | #include <stdio.h>
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69 | #include <ctype.h>
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70 | #include <string.h>
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71 | #endif
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72 |
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73 | #include "bzlib.h"
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74 |
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75 |
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76 |
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77 | /*-- General stuff. --*/
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78 |
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79 | #define BZ_VERSION "1.0.3, 15-Feb-2005"
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80 |
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81 | typedef char Char;
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82 | typedef unsigned char Bool;
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83 | typedef unsigned char UChar;
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84 | typedef int Int32;
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85 | typedef unsigned int UInt32;
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86 | typedef short Int16;
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87 | typedef unsigned short UInt16;
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88 |
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89 | #define True ((Bool)1)
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90 | #define False ((Bool)0)
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91 |
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92 | #ifndef __GNUC__
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93 | #define __inline__ /* */
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94 | #endif
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95 |
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96 | #ifndef BZ_NO_STDIO
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97 | extern void BZ2_bz__AssertH__fail ( int errcode );
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98 | #define AssertH(cond,errcode) \
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99 | { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
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100 | #if BZ_DEBUG
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101 | #define AssertD(cond,msg) \
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102 | { if (!(cond)) { \
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103 | fprintf ( stderr, \
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104 | "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
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105 | exit(1); \
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106 | }}
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107 | #else
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108 | #define AssertD(cond,msg) /* */
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109 | #endif
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110 | #define VPrintf0(zf) \
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111 | fprintf(stderr,zf)
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112 | #define VPrintf1(zf,za1) \
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113 | fprintf(stderr,zf,za1)
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114 | #define VPrintf2(zf,za1,za2) \
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115 | fprintf(stderr,zf,za1,za2)
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116 | #define VPrintf3(zf,za1,za2,za3) \
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117 | fprintf(stderr,zf,za1,za2,za3)
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118 | #define VPrintf4(zf,za1,za2,za3,za4) \
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119 | fprintf(stderr,zf,za1,za2,za3,za4)
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120 | #define VPrintf5(zf,za1,za2,za3,za4,za5) \
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121 | fprintf(stderr,zf,za1,za2,za3,za4,za5)
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122 | #else
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123 | extern void bz_internal_error ( int errcode );
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124 | #define AssertH(cond,errcode) \
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125 | { if (!(cond)) bz_internal_error ( errcode ); }
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126 | #define AssertD(cond,msg) /* */
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127 | #define VPrintf0(zf) /* */
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128 | #define VPrintf1(zf,za1) /* */
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129 | #define VPrintf2(zf,za1,za2) /* */
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130 | #define VPrintf3(zf,za1,za2,za3) /* */
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131 | #define VPrintf4(zf,za1,za2,za3,za4) /* */
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132 | #define VPrintf5(zf,za1,za2,za3,za4,za5) /* */
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133 | #endif
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134 |
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135 |
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136 | #define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
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137 | #define BZFREE(ppp) (strm->bzfree)(strm->opaque,(ppp))
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138 |
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139 |
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140 | /*-- Header bytes. --*/
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141 |
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142 | #define BZ_HDR_B 0x42 /* 'B' */
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143 | #define BZ_HDR_Z 0x5a /* 'Z' */
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144 | #define BZ_HDR_h 0x68 /* 'h' */
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145 | #define BZ_HDR_0 0x30 /* '0' */
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146 |
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147 | /*-- Constants for the back end. --*/
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148 |
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149 | #define BZ_MAX_ALPHA_SIZE 258
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150 | #define BZ_MAX_CODE_LEN 23
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151 |
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152 | #define BZ_RUNA 0
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153 | #define BZ_RUNB 1
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154 |
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155 | #define BZ_N_GROUPS 6
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156 | #define BZ_G_SIZE 50
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157 | #define BZ_N_ITERS 4
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158 |
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159 | #define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
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160 |
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161 |
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162 |
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163 | /*-- Stuff for randomising repetitive blocks. --*/
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164 |
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165 | extern Int32 BZ2_rNums[512];
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166 |
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167 | #define BZ_RAND_DECLS \
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168 | Int32 rNToGo; \
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169 | Int32 rTPos \
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170 |
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171 | #define BZ_RAND_INIT_MASK \
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172 | s->rNToGo = 0; \
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173 | s->rTPos = 0 \
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174 |
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175 | #define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
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176 |
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177 | #define BZ_RAND_UPD_MASK \
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178 | if (s->rNToGo == 0) { \
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179 | s->rNToGo = BZ2_rNums[s->rTPos]; \
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180 | s->rTPos++; \
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181 | if (s->rTPos == 512) s->rTPos = 0; \
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182 | } \
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183 | s->rNToGo--;
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184 |
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185 |
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186 |
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187 | /*-- Stuff for doing CRCs. --*/
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188 |
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189 | extern UInt32 BZ2_crc32Table[256];
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190 |
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191 | #define BZ_INITIALISE_CRC(crcVar) \
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192 | { \
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193 | crcVar = 0xffffffffL; \
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194 | }
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195 |
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196 | #define BZ_FINALISE_CRC(crcVar) \
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197 | { \
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198 | crcVar = ~(crcVar); \
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199 | }
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200 |
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201 | #define BZ_UPDATE_CRC(crcVar,cha) \
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202 | { \
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203 | crcVar = (crcVar << 8) ^ \
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204 | BZ2_crc32Table[(crcVar >> 24) ^ \
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205 | ((UChar)cha)]; \
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206 | }
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207 |
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208 |
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209 |
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210 | /*-- States and modes for compression. --*/
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211 |
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212 | #define BZ_M_IDLE 1
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213 | #define BZ_M_RUNNING 2
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214 | #define BZ_M_FLUSHING 3
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215 | #define BZ_M_FINISHING 4
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216 |
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217 | #define BZ_S_OUTPUT 1
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218 | #define BZ_S_INPUT 2
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219 |
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220 | #define BZ_N_RADIX 2
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221 | #define BZ_N_QSORT 12
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222 | #define BZ_N_SHELL 18
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223 | #define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
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224 |
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225 |
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226 |
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227 |
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228 | /*-- Structure holding all the compression-side stuff. --*/
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229 |
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230 | typedef
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231 | struct {
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232 | /* pointer back to the struct bz_stream */
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233 | bz_stream* strm;
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234 |
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235 | /* mode this stream is in, and whether inputting */
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236 | /* or outputting data */
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237 | Int32 mode;
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238 | Int32 state;
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239 |
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240 | /* remembers avail_in when flush/finish requested */
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241 | UInt32 avail_in_expect;
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242 |
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243 | /* for doing the block sorting */
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244 | UInt32* arr1;
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245 | UInt32* arr2;
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246 | UInt32* ftab;
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247 | Int32 origPtr;
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248 |
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249 | /* aliases for arr1 and arr2 */
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250 | UInt32* ptr;
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251 | UChar* block;
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252 | UInt16* mtfv;
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253 | UChar* zbits;
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254 |
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255 | /* for deciding when to use the fallback sorting algorithm */
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256 | Int32 workFactor;
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257 |
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258 | /* run-length-encoding of the input */
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259 | UInt32 state_in_ch;
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260 | Int32 state_in_len;
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261 | BZ_RAND_DECLS;
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262 |
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263 | /* input and output limits and current posns */
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264 | Int32 nblock;
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265 | Int32 nblockMAX;
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266 | Int32 numZ;
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267 | Int32 state_out_pos;
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268 |
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269 | /* map of bytes used in block */
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270 | Int32 nInUse;
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271 | Bool inUse[256];
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272 | UChar unseqToSeq[256];
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273 |
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274 | /* the buffer for bit stream creation */
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275 | UInt32 bsBuff;
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276 | Int32 bsLive;
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277 |
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278 | /* block and combined CRCs */
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279 | UInt32 blockCRC;
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280 | UInt32 combinedCRC;
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281 |
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282 | /* misc administratium */
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283 | Int32 verbosity;
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284 | Int32 blockNo;
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285 | Int32 blockSize100k;
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286 |
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287 | /* stuff for coding the MTF values */
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288 | Int32 nMTF;
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289 | Int32 mtfFreq [BZ_MAX_ALPHA_SIZE];
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290 | UChar selector [BZ_MAX_SELECTORS];
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291 | UChar selectorMtf[BZ_MAX_SELECTORS];
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292 |
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293 | UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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294 | Int32 code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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295 | Int32 rfreq [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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296 | /* second dimension: only 3 needed; 4 makes index calculations faster */
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297 | UInt32 len_pack[BZ_MAX_ALPHA_SIZE][4];
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298 |
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299 | }
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300 | EState;
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301 |
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302 |
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303 |
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304 | /*-- externs for compression. --*/
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305 |
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306 | extern void
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307 | BZ2_blockSort ( EState* );
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308 |
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309 | extern void
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310 | BZ2_compressBlock ( EState*, Bool );
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311 |
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312 | extern void
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313 | BZ2_bsInitWrite ( EState* );
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314 |
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315 | extern void
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316 | BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
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317 |
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318 | extern void
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319 | BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
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320 |
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321 |
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322 |
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323 | /*-- states for decompression. --*/
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324 |
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325 | #define BZ_X_IDLE 1
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326 | #define BZ_X_OUTPUT 2
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327 |
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328 | #define BZ_X_MAGIC_1 10
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329 | #define BZ_X_MAGIC_2 11
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330 | #define BZ_X_MAGIC_3 12
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331 | #define BZ_X_MAGIC_4 13
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332 | #define BZ_X_BLKHDR_1 14
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333 | #define BZ_X_BLKHDR_2 15
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334 | #define BZ_X_BLKHDR_3 16
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335 | #define BZ_X_BLKHDR_4 17
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336 | #define BZ_X_BLKHDR_5 18
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337 | #define BZ_X_BLKHDR_6 19
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338 | #define BZ_X_BCRC_1 20
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339 | #define BZ_X_BCRC_2 21
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340 | #define BZ_X_BCRC_3 22
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341 | #define BZ_X_BCRC_4 23
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342 | #define BZ_X_RANDBIT 24
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343 | #define BZ_X_ORIGPTR_1 25
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344 | #define BZ_X_ORIGPTR_2 26
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345 | #define BZ_X_ORIGPTR_3 27
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346 | #define BZ_X_MAPPING_1 28
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347 | #define BZ_X_MAPPING_2 29
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348 | #define BZ_X_SELECTOR_1 30
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349 | #define BZ_X_SELECTOR_2 31
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350 | #define BZ_X_SELECTOR_3 32
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351 | #define BZ_X_CODING_1 33
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352 | #define BZ_X_CODING_2 34
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353 | #define BZ_X_CODING_3 35
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354 | #define BZ_X_MTF_1 36
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355 | #define BZ_X_MTF_2 37
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356 | #define BZ_X_MTF_3 38
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357 | #define BZ_X_MTF_4 39
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358 | #define BZ_X_MTF_5 40
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359 | #define BZ_X_MTF_6 41
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360 | #define BZ_X_ENDHDR_2 42
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361 | #define BZ_X_ENDHDR_3 43
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362 | #define BZ_X_ENDHDR_4 44
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363 | #define BZ_X_ENDHDR_5 45
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364 | #define BZ_X_ENDHDR_6 46
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365 | #define BZ_X_CCRC_1 47
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366 | #define BZ_X_CCRC_2 48
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367 | #define BZ_X_CCRC_3 49
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368 | #define BZ_X_CCRC_4 50
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369 |
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370 |
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371 |
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372 | /*-- Constants for the fast MTF decoder. --*/
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373 |
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374 | #define MTFA_SIZE 4096
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375 | #define MTFL_SIZE 16
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376 |
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377 |
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378 |
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379 | /*-- Structure holding all the decompression-side stuff. --*/
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380 |
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381 | typedef
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382 | struct {
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383 | /* pointer back to the struct bz_stream */
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384 | bz_stream* strm;
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385 |
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386 | /* state indicator for this stream */
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387 | Int32 state;
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388 |
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389 | /* for doing the final run-length decoding */
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390 | UChar state_out_ch;
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391 | Int32 state_out_len;
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392 | Bool blockRandomised;
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393 | BZ_RAND_DECLS;
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394 |
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395 | /* the buffer for bit stream reading */
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396 | UInt32 bsBuff;
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397 | Int32 bsLive;
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398 |
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399 | /* misc administratium */
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400 | Int32 blockSize100k;
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401 | Bool smallDecompress;
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402 | Int32 currBlockNo;
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403 | Int32 verbosity;
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404 |
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405 | /* for undoing the Burrows-Wheeler transform */
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406 | Int32 origPtr;
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407 | UInt32 tPos;
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408 | Int32 k0;
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409 | Int32 unzftab[256];
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410 | Int32 nblock_used;
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411 | Int32 cftab[257];
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412 | Int32 cftabCopy[257];
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413 |
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414 | /* for undoing the Burrows-Wheeler transform (FAST) */
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415 | UInt32 *tt;
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416 |
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417 | /* for undoing the Burrows-Wheeler transform (SMALL) */
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418 | UInt16 *ll16;
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419 | UChar *ll4;
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420 |
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421 | /* stored and calculated CRCs */
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422 | UInt32 storedBlockCRC;
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423 | UInt32 storedCombinedCRC;
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424 | UInt32 calculatedBlockCRC;
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425 | UInt32 calculatedCombinedCRC;
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426 |
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427 | /* map of bytes used in block */
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428 | Int32 nInUse;
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429 | Bool inUse[256];
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430 | Bool inUse16[16];
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431 | UChar seqToUnseq[256];
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432 |
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433 | /* for decoding the MTF values */
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434 | UChar mtfa [MTFA_SIZE];
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435 | Int32 mtfbase[256 / MTFL_SIZE];
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436 | UChar selector [BZ_MAX_SELECTORS];
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437 | UChar selectorMtf[BZ_MAX_SELECTORS];
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438 | UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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439 |
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440 | Int32 limit [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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441 | Int32 base [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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442 | Int32 perm [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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443 | Int32 minLens[BZ_N_GROUPS];
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444 |
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445 | /* save area for scalars in the main decompress code */
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446 | Int32 save_i;
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447 | Int32 save_j;
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448 | Int32 save_t;
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449 | Int32 save_alphaSize;
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450 | Int32 save_nGroups;
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451 | Int32 save_nSelectors;
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452 | Int32 save_EOB;
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453 | Int32 save_groupNo;
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454 | Int32 save_groupPos;
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455 | Int32 save_nextSym;
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456 | Int32 save_nblockMAX;
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457 | Int32 save_nblock;
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458 | Int32 save_es;
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459 | Int32 save_N;
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460 | Int32 save_curr;
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461 | Int32 save_zt;
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462 | Int32 save_zn;
|
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463 | Int32 save_zvec;
|
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464 | Int32 save_zj;
|
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465 | Int32 save_gSel;
|
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466 | Int32 save_gMinlen;
|
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467 | Int32* save_gLimit;
|
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468 | Int32* save_gBase;
|
---|
469 | Int32* save_gPerm;
|
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470 |
|
---|
471 | }
|
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472 | DState;
|
---|
473 |
|
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474 |
|
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475 |
|
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476 | /*-- Macros for decompression. --*/
|
---|
477 |
|
---|
478 | #define BZ_GET_FAST(cccc) \
|
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479 | s->tPos = s->tt[s->tPos]; \
|
---|
480 | cccc = (UChar)(s->tPos & 0xff); \
|
---|
481 | s->tPos >>= 8;
|
---|
482 |
|
---|
483 | #define BZ_GET_FAST_C(cccc) \
|
---|
484 | c_tPos = c_tt[c_tPos]; \
|
---|
485 | cccc = (UChar)(c_tPos & 0xff); \
|
---|
486 | c_tPos >>= 8;
|
---|
487 |
|
---|
488 | #define SET_LL4(i,n) \
|
---|
489 | { if (((i) & 0x1) == 0) \
|
---|
490 | s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else \
|
---|
491 | s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4); \
|
---|
492 | }
|
---|
493 |
|
---|
494 | #define GET_LL4(i) \
|
---|
495 | ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
|
---|
496 |
|
---|
497 | #define SET_LL(i,n) \
|
---|
498 | { s->ll16[i] = (UInt16)(n & 0x0000ffff); \
|
---|
499 | SET_LL4(i, n >> 16); \
|
---|
500 | }
|
---|
501 |
|
---|
502 | #define GET_LL(i) \
|
---|
503 | (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
|
---|
504 |
|
---|
505 | #define BZ_GET_SMALL(cccc) \
|
---|
506 | cccc = BZ2_indexIntoF ( s->tPos, s->cftab ); \
|
---|
507 | s->tPos = GET_LL(s->tPos);
|
---|
508 |
|
---|
509 |
|
---|
510 | /*-- externs for decompression. --*/
|
---|
511 |
|
---|
512 | extern Int32
|
---|
513 | BZ2_indexIntoF ( Int32, Int32* );
|
---|
514 |
|
---|
515 | extern Int32
|
---|
516 | BZ2_decompress ( DState* );
|
---|
517 |
|
---|
518 | extern void
|
---|
519 | BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
|
---|
520 | Int32, Int32, Int32 );
|
---|
521 |
|
---|
522 |
|
---|
523 | #endif
|
---|
524 |
|
---|
525 |
|
---|
526 | /*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
|
---|
527 |
|
---|
528 | #ifdef BZ_NO_STDIO
|
---|
529 | #ifndef NULL
|
---|
530 | #define NULL 0
|
---|
531 | #endif
|
---|
532 | #endif
|
---|
533 |
|
---|
534 |
|
---|
535 | /*-------------------------------------------------------------*/
|
---|
536 | /*--- end bzlib_private.h ---*/
|
---|
537 | /*-------------------------------------------------------------*/
|
---|