1 | /* |
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2 | * Copyright (c) 2012, Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * Permission to use, copy, modify, and/or distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 | */ |
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16 | /** |
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17 | * @file |
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18 | * |
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19 | * @ingroup rtems_ld |
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20 | * |
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21 | * @brief RTEMS Linker. |
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22 | * |
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23 | */ |
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24 | |
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25 | #if HAVE_CONFIG_H |
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26 | #include "config.h" |
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27 | #endif |
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28 | |
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29 | #include <fstream> |
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30 | #include <iostream> |
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31 | |
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32 | #include <errno.h> |
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33 | #include <string.h> |
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34 | |
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35 | #include <rld.h> |
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36 | #include <rld-compression.h> |
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37 | |
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38 | #include "fastlz.h" |
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39 | |
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40 | namespace rld |
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41 | { |
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42 | namespace compress |
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43 | { |
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44 | compressor::compressor (files::image& image, |
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45 | size_t size, |
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46 | bool out, |
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47 | bool compress) |
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48 | : image (image), |
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49 | size (size), |
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50 | out (out), |
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51 | compress (compress), |
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52 | buffer (0), |
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53 | io (0), |
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54 | level (0), |
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55 | total (0), |
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56 | total_compressed (0) |
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57 | { |
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58 | if (size > 0xffff) |
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59 | throw rld::error ("Size too big, 16 bits only", "compression"); |
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60 | |
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61 | buffer = new uint8_t[size]; |
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62 | io = new uint8_t[size + (size / 10)]; |
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63 | } |
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64 | |
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65 | compressor::~compressor () |
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66 | { |
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67 | flush (); |
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68 | delete [] buffer; |
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69 | delete [] io; |
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70 | } |
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71 | |
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72 | void |
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73 | compressor::write (const void* data_, size_t length) |
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74 | { |
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75 | if (!out) |
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76 | throw rld::error ("Write on read-only", "compression"); |
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77 | |
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78 | const uint8_t* data = static_cast <const uint8_t*> (data_); |
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79 | |
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80 | while (length) |
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81 | { |
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82 | size_t appending; |
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83 | |
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84 | if (length > (size - level)) |
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85 | appending = size - level; |
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86 | else |
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87 | appending = length; |
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88 | |
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89 | ::memcpy ((void*) (buffer + level), data, appending); |
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90 | |
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91 | data += appending; |
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92 | level += appending; |
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93 | length -= appending; |
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94 | total += appending; |
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95 | |
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96 | output (); |
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97 | } |
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98 | } |
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99 | |
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100 | void |
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101 | compressor::write (files::image& input, off_t offset, size_t length) |
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102 | { |
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103 | if (!out) |
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104 | throw rld::error ("Write on read-only", "compression"); |
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105 | |
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106 | input.seek (offset); |
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107 | |
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108 | while (length) |
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109 | { |
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110 | size_t appending; |
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111 | |
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112 | if (length > (size - level)) |
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113 | appending = size - level; |
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114 | else |
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115 | appending = length; |
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116 | |
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117 | input.read ((void*) (buffer + level), appending); |
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118 | |
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119 | level += appending; |
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120 | length -= appending; |
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121 | total += appending; |
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122 | |
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123 | output (); |
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124 | } |
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125 | } |
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126 | |
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127 | size_t |
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128 | compressor::read (void* data_, size_t length) |
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129 | { |
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130 | if (out) |
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131 | throw rld::error ("Read on write-only", "compression"); |
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132 | |
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133 | uint8_t* data = static_cast <uint8_t*> (data_); |
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134 | |
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135 | size_t amount = 0; |
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136 | |
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137 | while (length) |
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138 | { |
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139 | input (); |
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140 | |
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141 | if (level == 0) |
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142 | break; |
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143 | |
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144 | size_t appending; |
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145 | |
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146 | if (length > level) |
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147 | appending = level; |
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148 | else |
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149 | appending = length; |
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150 | |
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151 | ::memcpy (data, buffer, appending); |
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152 | ::memmove (buffer, buffer + appending, level - appending); |
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153 | |
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154 | data += appending; |
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155 | level -= appending; |
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156 | length -= appending; |
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157 | total += appending; |
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158 | amount += appending; |
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159 | } |
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160 | |
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161 | return amount; |
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162 | } |
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163 | |
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164 | size_t |
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165 | compressor::read (files::image& output_, off_t offset, size_t length) |
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166 | { |
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167 | if (out) |
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168 | throw rld::error ("Read on write-only", "compression"); |
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169 | |
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170 | output_.seek (offset); |
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171 | |
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172 | return read (output_, length); |
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173 | } |
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174 | |
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175 | size_t |
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176 | compressor::read (files::image& output_, size_t length) |
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177 | { |
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178 | if (out) |
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179 | throw rld::error ("Read on write-only", "compression"); |
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180 | |
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181 | size_t amount = 0; |
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182 | |
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183 | while (length) |
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184 | { |
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185 | input (); |
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186 | |
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187 | if (level == 0) |
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188 | break; |
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189 | |
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190 | size_t appending; |
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191 | |
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192 | if (length > level) |
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193 | appending = level; |
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194 | else |
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195 | appending = length; |
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196 | |
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197 | output_.write (buffer, appending); |
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198 | |
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199 | ::memmove (buffer, buffer + appending, level - appending); |
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200 | |
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201 | level -= appending; |
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202 | length -= appending; |
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203 | total += appending; |
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204 | amount += appending; |
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205 | } |
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206 | |
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207 | return amount; |
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208 | } |
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209 | |
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210 | void |
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211 | compressor::flush () |
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212 | { |
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213 | output (true); |
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214 | } |
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215 | |
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216 | size_t |
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217 | compressor::transferred () const |
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218 | { |
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219 | return total; |
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220 | } |
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221 | |
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222 | size_t |
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223 | compressor::compressed () const |
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224 | { |
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225 | return total_compressed; |
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226 | } |
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227 | |
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228 | off_t |
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229 | compressor::offset () const |
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230 | { |
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231 | return total; |
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232 | } |
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233 | |
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234 | void |
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235 | compressor::output (bool forced) |
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236 | { |
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237 | if (out && ((forced && level) || (level >= size))) |
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238 | { |
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239 | if (compress) |
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240 | { |
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241 | int writing = ::fastlz_compress (buffer, level, io); |
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242 | uint8_t header[2]; |
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243 | |
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244 | if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG) |
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245 | std::cout << "rtl: comp: offset=" << total_compressed |
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246 | << " block-size=" << writing << std::endl; |
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247 | |
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248 | header[0] = writing >> 8; |
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249 | header[1] = writing; |
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250 | |
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251 | image.write (header, 2); |
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252 | image.write (io, writing); |
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253 | |
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254 | total_compressed += 2 + writing; |
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255 | } |
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256 | else |
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257 | { |
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258 | image.write (buffer, level); |
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259 | } |
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260 | |
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261 | level = 0; |
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262 | } |
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263 | } |
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264 | |
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265 | void |
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266 | compressor::input () |
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267 | { |
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268 | if (!out && (level == 0)) |
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269 | { |
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270 | if (compress) |
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271 | { |
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272 | uint8_t header[2]; |
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273 | |
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274 | if (image.read (header, 2) == 2) |
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275 | { |
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276 | ssize_t block_size = |
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277 | (((ssize_t) header[0]) << 8) | (ssize_t) header[1]; |
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278 | |
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279 | if (block_size == 0) |
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280 | throw rld::error ("Block size is invalid (0)", "compression"); |
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281 | |
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282 | total_compressed += 2 + block_size; |
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283 | |
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284 | if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG) |
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285 | std::cout << "rtl: decomp: block-size=" << block_size |
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286 | << std::endl; |
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287 | |
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288 | if (image.read (io, block_size) != block_size) |
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289 | throw rld::error ("Read past end", "compression"); |
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290 | |
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291 | level = ::fastlz_decompress (io, block_size, buffer, size); |
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292 | } |
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293 | } |
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294 | else |
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295 | { |
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296 | image.read (buffer, size); |
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297 | level = size; |
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298 | } |
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299 | } |
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300 | } |
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301 | |
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302 | } |
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303 | } |
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