1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Small lzma deflate implementation.
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4 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
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5 | *
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6 | * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
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7 | * Copyright (C) 1999-2005 Igor Pavlov
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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10 | */
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11 | #include "libbb.h"
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12 | #include "archive.h"
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13 |
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14 | #if ENABLE_FEATURE_LZMA_FAST
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15 | # define speed_inline ALWAYS_INLINE
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16 | # define size_inline
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17 | #else
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18 | # define speed_inline
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19 | # define size_inline ALWAYS_INLINE
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20 | #endif
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21 |
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22 |
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23 | typedef struct {
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24 | int fd;
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25 | uint8_t *ptr;
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26 |
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27 | /* Was keeping rc on stack in unlzma and separately allocating buffer,
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28 | * but with "buffer 'attached to' allocated rc" code is smaller: */
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29 | /* uint8_t *buffer; */
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30 | #define RC_BUFFER ((uint8_t*)(rc+1))
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31 |
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32 | uint8_t *buffer_end;
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33 |
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34 | /* Had provisions for variable buffer, but we don't need it here */
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35 | /* int buffer_size; */
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36 | #define RC_BUFFER_SIZE 0x10000
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37 |
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38 | uint32_t code;
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39 | uint32_t range;
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40 | uint32_t bound;
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41 | } rc_t;
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42 |
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43 | #define RC_TOP_BITS 24
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44 | #define RC_MOVE_BITS 5
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45 | #define RC_MODEL_TOTAL_BITS 11
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46 |
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47 |
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48 | /* Called twice: once at startup (LZMA_FAST only) and once in rc_normalize() */
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49 | static size_inline void rc_read(rc_t *rc)
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50 | {
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51 | int buffer_size = safe_read(rc->fd, RC_BUFFER, RC_BUFFER_SIZE);
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52 | //TODO: return -1 instead
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53 | //This will make unlzma delete broken unpacked file on unpack errors
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54 | if (buffer_size <= 0)
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55 | bb_error_msg_and_die("unexpected EOF");
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56 | rc->ptr = RC_BUFFER;
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57 | rc->buffer_end = RC_BUFFER + buffer_size;
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58 | }
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59 |
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60 | /* Called twice, but one callsite is in speed_inline'd rc_is_bit_1() */
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61 | static void rc_do_normalize(rc_t *rc)
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62 | {
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63 | if (rc->ptr >= rc->buffer_end)
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64 | rc_read(rc);
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65 | rc->range <<= 8;
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66 | rc->code = (rc->code << 8) | *rc->ptr++;
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67 | }
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68 |
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69 | /* Called once */
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70 | static ALWAYS_INLINE rc_t* rc_init(int fd) /*, int buffer_size) */
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71 | {
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72 | int i;
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73 | rc_t *rc;
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74 |
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75 | rc = xzalloc(sizeof(*rc) + RC_BUFFER_SIZE);
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76 |
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77 | rc->fd = fd;
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78 | /* rc->ptr = rc->buffer_end; */
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79 |
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80 | for (i = 0; i < 5; i++) {
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81 | #if ENABLE_FEATURE_LZMA_FAST
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82 | if (rc->ptr >= rc->buffer_end)
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83 | rc_read(rc);
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84 | rc->code = (rc->code << 8) | *rc->ptr++;
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85 | #else
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86 | rc_do_normalize(rc);
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87 | #endif
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88 | }
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89 | rc->range = 0xFFFFFFFF;
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90 | return rc;
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91 | }
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92 |
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93 | /* Called once */
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94 | static ALWAYS_INLINE void rc_free(rc_t *rc)
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95 | {
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96 | free(rc);
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97 | }
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98 |
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99 | static ALWAYS_INLINE void rc_normalize(rc_t *rc)
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100 | {
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101 | if (rc->range < (1 << RC_TOP_BITS)) {
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102 | rc_do_normalize(rc);
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103 | }
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104 | }
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105 |
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106 | /* rc_is_bit_1 is called 9 times */
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107 | static speed_inline int rc_is_bit_1(rc_t *rc, uint16_t *p)
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108 | {
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109 | rc_normalize(rc);
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110 | rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
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111 | if (rc->code < rc->bound) {
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112 | rc->range = rc->bound;
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113 | *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
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114 | return 0;
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115 | }
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116 | rc->range -= rc->bound;
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117 | rc->code -= rc->bound;
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118 | *p -= *p >> RC_MOVE_BITS;
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119 | return 1;
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120 | }
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121 |
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122 | /* Called 4 times in unlzma loop */
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123 | static speed_inline int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
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124 | {
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125 | int ret = rc_is_bit_1(rc, p);
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126 | *symbol = *symbol * 2 + ret;
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127 | return ret;
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128 | }
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129 |
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130 | /* Called once */
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131 | static ALWAYS_INLINE int rc_direct_bit(rc_t *rc)
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132 | {
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133 | rc_normalize(rc);
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134 | rc->range >>= 1;
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135 | if (rc->code >= rc->range) {
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136 | rc->code -= rc->range;
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137 | return 1;
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138 | }
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139 | return 0;
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140 | }
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141 |
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142 | /* Called twice */
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143 | static speed_inline void
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144 | rc_bit_tree_decode(rc_t *rc, uint16_t *p, int num_levels, int *symbol)
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145 | {
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146 | int i = num_levels;
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147 |
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148 | *symbol = 1;
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149 | while (i--)
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150 | rc_get_bit(rc, p + *symbol, symbol);
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151 | *symbol -= 1 << num_levels;
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152 | }
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153 |
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154 |
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155 | typedef struct {
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156 | uint8_t pos;
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157 | uint32_t dict_size;
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158 | uint64_t dst_size;
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159 | } PACKED lzma_header_t;
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160 |
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161 |
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162 | /* #defines will force compiler to compute/optimize each one with each usage.
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163 | * Have heart and use enum instead. */
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164 | enum {
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165 | LZMA_BASE_SIZE = 1846,
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166 | LZMA_LIT_SIZE = 768,
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167 |
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168 | LZMA_NUM_POS_BITS_MAX = 4,
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169 |
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170 | LZMA_LEN_NUM_LOW_BITS = 3,
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171 | LZMA_LEN_NUM_MID_BITS = 3,
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172 | LZMA_LEN_NUM_HIGH_BITS = 8,
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173 |
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174 | LZMA_LEN_CHOICE = 0,
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175 | LZMA_LEN_CHOICE_2 = (LZMA_LEN_CHOICE + 1),
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176 | LZMA_LEN_LOW = (LZMA_LEN_CHOICE_2 + 1),
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177 | LZMA_LEN_MID = (LZMA_LEN_LOW \
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178 | + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS))),
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179 | LZMA_LEN_HIGH = (LZMA_LEN_MID \
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180 | + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS))),
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181 | LZMA_NUM_LEN_PROBS = (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS)),
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182 |
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183 | LZMA_NUM_STATES = 12,
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184 | LZMA_NUM_LIT_STATES = 7,
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185 |
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186 | LZMA_START_POS_MODEL_INDEX = 4,
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187 | LZMA_END_POS_MODEL_INDEX = 14,
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188 | LZMA_NUM_FULL_DISTANCES = (1 << (LZMA_END_POS_MODEL_INDEX >> 1)),
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189 |
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190 | LZMA_NUM_POS_SLOT_BITS = 6,
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191 | LZMA_NUM_LEN_TO_POS_STATES = 4,
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192 |
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193 | LZMA_NUM_ALIGN_BITS = 4,
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194 |
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195 | LZMA_MATCH_MIN_LEN = 2,
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196 |
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197 | LZMA_IS_MATCH = 0,
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198 | LZMA_IS_REP = (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)),
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199 | LZMA_IS_REP_G0 = (LZMA_IS_REP + LZMA_NUM_STATES),
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200 | LZMA_IS_REP_G1 = (LZMA_IS_REP_G0 + LZMA_NUM_STATES),
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201 | LZMA_IS_REP_G2 = (LZMA_IS_REP_G1 + LZMA_NUM_STATES),
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202 | LZMA_IS_REP_0_LONG = (LZMA_IS_REP_G2 + LZMA_NUM_STATES),
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203 | LZMA_POS_SLOT = (LZMA_IS_REP_0_LONG \
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204 | + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)),
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205 | LZMA_SPEC_POS = (LZMA_POS_SLOT \
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206 | + (LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS)),
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207 | LZMA_ALIGN = (LZMA_SPEC_POS \
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208 | + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX),
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209 | LZMA_LEN_CODER = (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS)),
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210 | LZMA_REP_LEN_CODER = (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS),
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211 | LZMA_LITERAL = (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS),
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212 | };
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213 |
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214 |
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215 | IF_DESKTOP(long long) int FAST_FUNC
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216 | unpack_lzma_stream(int src_fd, int dst_fd)
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217 | {
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218 | IF_DESKTOP(long long total_written = 0;)
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219 | lzma_header_t header;
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220 | int lc, pb, lp;
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221 | uint32_t pos_state_mask;
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222 | uint32_t literal_pos_mask;
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223 | uint16_t *p;
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224 | int num_bits;
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225 | int num_probs;
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226 | rc_t *rc;
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227 | int i;
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228 | uint8_t *buffer;
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229 | uint8_t previous_byte = 0;
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230 | size_t buffer_pos = 0, global_pos = 0;
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231 | int len = 0;
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232 | int state = 0;
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233 | uint32_t rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
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234 |
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235 | if (full_read(src_fd, &header, sizeof(header)) != sizeof(header)
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236 | || header.pos >= (9 * 5 * 5)
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237 | ) {
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238 | bb_error_msg("bad lzma header");
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239 | return -1;
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240 | }
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241 |
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242 | i = header.pos / 9;
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243 | lc = header.pos % 9;
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244 | pb = i / 5;
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245 | lp = i % 5;
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246 | pos_state_mask = (1 << pb) - 1;
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247 | literal_pos_mask = (1 << lp) - 1;
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248 |
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249 | header.dict_size = SWAP_LE32(header.dict_size);
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250 | header.dst_size = SWAP_LE64(header.dst_size);
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251 |
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252 | if (header.dict_size == 0)
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253 | header.dict_size++;
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254 |
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255 | buffer = xmalloc(MIN(header.dst_size, header.dict_size));
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256 |
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257 | num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
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258 | p = xmalloc(num_probs * sizeof(*p));
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259 | num_probs += LZMA_LITERAL - LZMA_BASE_SIZE;
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260 | for (i = 0; i < num_probs; i++)
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261 | p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
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262 |
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263 | rc = rc_init(src_fd); /*, RC_BUFFER_SIZE); */
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264 |
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265 | while (global_pos + buffer_pos < header.dst_size) {
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266 | int pos_state = (buffer_pos + global_pos) & pos_state_mask;
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267 | uint16_t *prob = p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + pos_state;
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268 |
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269 | if (!rc_is_bit_1(rc, prob)) {
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270 | static const char next_state[LZMA_NUM_STATES] =
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271 | { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
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272 | int mi = 1;
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273 |
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274 | prob = (p + LZMA_LITERAL
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275 | + (LZMA_LIT_SIZE * ((((buffer_pos + global_pos) & literal_pos_mask) << lc)
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276 | + (previous_byte >> (8 - lc))
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277 | )
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278 | )
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279 | );
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280 |
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281 | if (state >= LZMA_NUM_LIT_STATES) {
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282 | int match_byte;
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283 | uint32_t pos = buffer_pos - rep0;
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284 |
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285 | while (pos >= header.dict_size)
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286 | pos += header.dict_size;
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287 | match_byte = buffer[pos];
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288 | do {
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289 | int bit;
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290 |
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291 | match_byte <<= 1;
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292 | bit = match_byte & 0x100;
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293 | bit ^= (rc_get_bit(rc, prob + 0x100 + bit + mi, &mi) << 8); /* 0x100 or 0 */
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294 | if (bit)
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295 | break;
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296 | } while (mi < 0x100);
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297 | }
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298 | while (mi < 0x100) {
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299 | rc_get_bit(rc, prob + mi, &mi);
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300 | }
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301 |
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302 | state = next_state[state];
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303 |
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304 | previous_byte = (uint8_t) mi;
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305 | #if ENABLE_FEATURE_LZMA_FAST
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306 | one_byte1:
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307 | buffer[buffer_pos++] = previous_byte;
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308 | if (buffer_pos == header.dict_size) {
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309 | buffer_pos = 0;
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310 | global_pos += header.dict_size;
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311 | if (full_write(dst_fd, buffer, header.dict_size) != (ssize_t)header.dict_size)
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312 | goto bad;
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313 | IF_DESKTOP(total_written += header.dict_size;)
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314 | }
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315 | #else
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316 | len = 1;
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317 | goto one_byte2;
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318 | #endif
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319 | } else {
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320 | int offset;
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321 | uint16_t *prob2;
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322 | #define prob_len prob2
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323 |
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324 | prob2 = p + LZMA_IS_REP + state;
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325 | if (!rc_is_bit_1(rc, prob2)) {
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326 | rep3 = rep2;
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327 | rep2 = rep1;
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328 | rep1 = rep0;
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329 | state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
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330 | prob2 = p + LZMA_LEN_CODER;
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331 | } else {
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332 | prob2 += LZMA_IS_REP_G0 - LZMA_IS_REP;
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333 | if (!rc_is_bit_1(rc, prob2)) {
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334 | prob2 = (p + LZMA_IS_REP_0_LONG
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335 | + (state << LZMA_NUM_POS_BITS_MAX)
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336 | + pos_state
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337 | );
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338 | if (!rc_is_bit_1(rc, prob2)) {
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339 | #if ENABLE_FEATURE_LZMA_FAST
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340 | uint32_t pos = buffer_pos - rep0;
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341 | state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
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342 | while (pos >= header.dict_size)
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343 | pos += header.dict_size;
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344 | previous_byte = buffer[pos];
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345 | goto one_byte1;
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346 | #else
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347 | state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
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348 | len = 1;
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349 | goto string;
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350 | #endif
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351 | }
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352 | } else {
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353 | uint32_t distance;
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354 |
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355 | prob2 += LZMA_IS_REP_G1 - LZMA_IS_REP_G0;
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356 | distance = rep1;
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357 | if (rc_is_bit_1(rc, prob2)) {
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358 | prob2 += LZMA_IS_REP_G2 - LZMA_IS_REP_G1;
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359 | distance = rep2;
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360 | if (rc_is_bit_1(rc, prob2)) {
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361 | distance = rep3;
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362 | rep3 = rep2;
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363 | }
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364 | rep2 = rep1;
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365 | }
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366 | rep1 = rep0;
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367 | rep0 = distance;
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368 | }
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369 | state = state < LZMA_NUM_LIT_STATES ? 8 : 11;
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370 | prob2 = p + LZMA_REP_LEN_CODER;
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371 | }
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372 |
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373 | prob_len = prob2 + LZMA_LEN_CHOICE;
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374 | num_bits = LZMA_LEN_NUM_LOW_BITS;
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375 | if (!rc_is_bit_1(rc, prob_len)) {
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376 | prob_len += LZMA_LEN_LOW - LZMA_LEN_CHOICE
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377 | + (pos_state << LZMA_LEN_NUM_LOW_BITS);
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378 | offset = 0;
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379 | } else {
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380 | prob_len += LZMA_LEN_CHOICE_2 - LZMA_LEN_CHOICE;
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381 | if (!rc_is_bit_1(rc, prob_len)) {
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382 | prob_len += LZMA_LEN_MID - LZMA_LEN_CHOICE_2
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383 | + (pos_state << LZMA_LEN_NUM_MID_BITS);
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384 | offset = 1 << LZMA_LEN_NUM_LOW_BITS;
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385 | num_bits += LZMA_LEN_NUM_MID_BITS - LZMA_LEN_NUM_LOW_BITS;
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386 | } else {
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387 | prob_len += LZMA_LEN_HIGH - LZMA_LEN_CHOICE_2;
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388 | offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
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389 | + (1 << LZMA_LEN_NUM_MID_BITS));
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390 | num_bits += LZMA_LEN_NUM_HIGH_BITS - LZMA_LEN_NUM_LOW_BITS;
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391 | }
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392 | }
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393 | rc_bit_tree_decode(rc, prob_len, num_bits, &len);
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394 | len += offset;
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395 |
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396 | if (state < 4) {
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397 | int pos_slot;
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398 | uint16_t *prob3;
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399 |
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400 | state += LZMA_NUM_LIT_STATES;
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401 | prob3 = p + LZMA_POS_SLOT +
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402 | ((len < LZMA_NUM_LEN_TO_POS_STATES ? len :
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403 | LZMA_NUM_LEN_TO_POS_STATES - 1)
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404 | << LZMA_NUM_POS_SLOT_BITS);
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405 | rc_bit_tree_decode(rc, prob3,
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406 | LZMA_NUM_POS_SLOT_BITS, &pos_slot);
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407 | rep0 = pos_slot;
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408 | if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
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409 | int i2, mi2, num_bits2 = (pos_slot >> 1) - 1;
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410 | rep0 = 2 | (pos_slot & 1);
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411 | if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
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412 | rep0 <<= num_bits2;
|
---|
413 | prob3 = p + LZMA_SPEC_POS + rep0 - pos_slot - 1;
|
---|
414 | } else {
|
---|
415 | for (; num_bits2 != LZMA_NUM_ALIGN_BITS; num_bits2--)
|
---|
416 | rep0 = (rep0 << 1) | rc_direct_bit(rc);
|
---|
417 | rep0 <<= LZMA_NUM_ALIGN_BITS;
|
---|
418 | prob3 = p + LZMA_ALIGN;
|
---|
419 | }
|
---|
420 | i2 = 1;
|
---|
421 | mi2 = 1;
|
---|
422 | while (num_bits2--) {
|
---|
423 | if (rc_get_bit(rc, prob3 + mi2, &mi2))
|
---|
424 | rep0 |= i2;
|
---|
425 | i2 <<= 1;
|
---|
426 | }
|
---|
427 | }
|
---|
428 | if (++rep0 == 0)
|
---|
429 | break;
|
---|
430 | }
|
---|
431 |
|
---|
432 | len += LZMA_MATCH_MIN_LEN;
|
---|
433 | IF_NOT_FEATURE_LZMA_FAST(string:)
|
---|
434 | do {
|
---|
435 | uint32_t pos = buffer_pos - rep0;
|
---|
436 | while (pos >= header.dict_size)
|
---|
437 | pos += header.dict_size;
|
---|
438 | previous_byte = buffer[pos];
|
---|
439 | IF_NOT_FEATURE_LZMA_FAST(one_byte2:)
|
---|
440 | buffer[buffer_pos++] = previous_byte;
|
---|
441 | if (buffer_pos == header.dict_size) {
|
---|
442 | buffer_pos = 0;
|
---|
443 | global_pos += header.dict_size;
|
---|
444 | if (full_write(dst_fd, buffer, header.dict_size) != (ssize_t)header.dict_size)
|
---|
445 | goto bad;
|
---|
446 | IF_DESKTOP(total_written += header.dict_size;)
|
---|
447 | }
|
---|
448 | len--;
|
---|
449 | } while (len != 0 && buffer_pos < header.dst_size);
|
---|
450 | }
|
---|
451 | }
|
---|
452 |
|
---|
453 | {
|
---|
454 | IF_NOT_DESKTOP(int total_written = 0; /* success */)
|
---|
455 | IF_DESKTOP(total_written += buffer_pos;)
|
---|
456 | if (full_write(dst_fd, buffer, buffer_pos) != (ssize_t)buffer_pos) {
|
---|
457 | bad:
|
---|
458 | total_written = -1; /* failure */
|
---|
459 | }
|
---|
460 | rc_free(rc);
|
---|
461 | free(p);
|
---|
462 | free(buffer);
|
---|
463 | return total_written;
|
---|
464 | }
|
---|
465 | }
|
---|