Mercurial > projects > ldc
annotate lphobos/std/zip.d @ 633:d208fc4291df
merge
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Wed, 01 Oct 2008 23:17:36 +0200 |
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1 |
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2 /** |
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3 * Read/write data in the $(LINK2 http://www.info-_zip.org, zip archive) format. |
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4 * Makes use of the etc.c.zlib compression library. |
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5 * |
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6 * Bugs: |
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7 * $(UL |
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8 * $(LI Multi-disk zips not supported.) |
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9 * $(LI Only Zip version 20 formats are supported.) |
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10 * $(LI Only supports compression modes 0 (no compression) and 8 (deflate).) |
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11 * $(LI Does not support encryption.) |
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12 * ) |
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13 * |
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14 * Macros: |
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15 * WIKI = Phobos/StdZip |
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16 */ |
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17 |
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18 module std.zip; |
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19 |
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20 private import std.zlib; |
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21 private import std.date; |
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22 private import std.intrinsic; |
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23 |
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24 //debug=print; |
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25 |
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26 /** Thrown on error. |
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27 */ |
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28 class ZipException : Exception |
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29 { |
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30 this(char[] msg) |
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31 { |
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32 super("ZipException: " ~ msg); |
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33 } |
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34 } |
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35 |
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36 /** |
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37 * A member of the ZipArchive. |
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38 */ |
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39 class ArchiveMember |
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40 { |
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41 ushort madeVersion = 20; /// Read Only |
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42 ushort extractVersion = 20; /// Read Only |
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43 ushort flags; /// Read/Write: normally set to 0 |
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44 ushort compressionMethod; /// Read/Write: 0 for compression, 8 for deflate |
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45 std.date.DosFileTime time; /// Read/Write: Last modified time of the member. It's in the DOS date/time format. |
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46 uint crc32; /// Read Only: cyclic redundancy check (CRC) value |
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47 uint compressedSize; /// Read Only: size of data of member in compressed form. |
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48 uint expandedSize; /// Read Only: size of data of member in expanded form. |
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49 ushort diskNumber; /// Read Only: should be 0. |
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50 ushort internalAttributes; /// Read/Write |
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51 uint externalAttributes; /// Read/Write |
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52 |
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53 private uint offset; |
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54 |
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55 /** |
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56 * Read/Write: Usually the file name of the archive member; it is used to |
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57 * index the archive directory for the member. Each member must have a unique |
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58 * name[]. Do not change without removing member from the directory first. |
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59 */ |
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60 char[] name; |
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61 |
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62 ubyte[] extra; /// Read/Write: extra data for this member. |
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63 char[] comment; /// Read/Write: comment associated with this member. |
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64 ubyte[] compressedData; /// Read Only: data of member in compressed form. |
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65 ubyte[] expandedData; /// Read/Write: data of member in uncompressed form. |
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66 |
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67 debug(print) |
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68 { |
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69 void print() |
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70 { |
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71 printf("name = '%.*s'\n", cast(int) name.length, name.ptr); |
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72 printf("\tcomment = '%.*s'\n", cast(int) comment.length, comment.ptr); |
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73 printf("\tmadeVersion = x%04x\n", madeVersion); |
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74 printf("\textractVersion = x%04x\n", extractVersion); |
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75 printf("\tflags = x%04x\n", flags); |
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76 printf("\tcompressionMethod = %d\n", compressionMethod); |
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77 printf("\ttime = %d\n", time); |
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78 printf("\tcrc32 = x%08x\n", crc32); |
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79 printf("\texpandedSize = %d\n", expandedSize); |
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80 printf("\tcompressedSize = %d\n", compressedSize); |
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81 printf("\tinternalAttributes = x%04x\n", internalAttributes); |
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82 printf("\texternalAttributes = x%08x\n", externalAttributes); |
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83 } |
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84 } |
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85 } |
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86 |
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87 /** |
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88 * Object representing the entire archive. |
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89 * ZipArchives are collections of ArchiveMembers. |
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90 */ |
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91 class ZipArchive |
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92 { |
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93 ubyte[] data; /// Read Only: array representing the entire contents of the archive. |
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94 uint endrecOffset; |
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95 |
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96 uint diskNumber; /// Read Only: 0 since multi-disk zip archives are not supported. |
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97 uint diskStartDir; /// Read Only: 0 since multi-disk zip archives are not supported. |
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98 uint numEntries; /// Read Only: number of ArchiveMembers in the directory. |
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99 uint totalEntries; /// Read Only: same as totalEntries. |
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100 char[] comment; /// Read/Write: the archive comment. Must be less than 65536 bytes in length. |
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101 |
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102 /** |
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103 * Read Only: array indexed by the name of each member of the archive. |
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104 * Example: |
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105 * All the members of the archive can be accessed with a foreach loop: |
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106 * -------------------- |
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107 * ZipArchive archive = new ZipArchive(data); |
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108 * foreach (ArchiveMember am; archive.directory) |
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109 * { |
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110 * writefln("member name is '%s'", am.name); |
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111 * } |
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112 * -------------------- |
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113 */ |
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114 ArchiveMember[char[]] directory; |
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115 |
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116 debug (print) |
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117 { |
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118 void print() |
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119 { |
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120 printf("\tdiskNumber = %u\n", diskNumber); |
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121 printf("\tdiskStartDir = %u\n", diskStartDir); |
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122 printf("\tnumEntries = %u\n", numEntries); |
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123 printf("\ttotalEntries = %u\n", totalEntries); |
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124 printf("\tcomment = '%.*s'\n", cast(int) comment.length, comment.ptr); |
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125 } |
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126 } |
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127 |
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128 /* ============ Creating a new archive =================== */ |
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129 |
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130 /** Constructor to use when creating a new archive. |
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131 */ |
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132 this() |
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133 { |
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134 } |
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135 |
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136 /** Add de to the archive. |
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137 */ |
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138 void addMember(ArchiveMember de) |
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139 { |
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140 directory[de.name] = de; |
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141 } |
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142 |
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143 /** Delete de from the archive. |
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144 */ |
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145 void deleteMember(ArchiveMember de) |
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146 { |
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147 directory.remove(de.name); |
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148 } |
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149 |
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150 /** |
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151 * Construct an archive out of the current members of the archive. |
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152 * |
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153 * Fills in the properties data[], diskNumber, diskStartDir, numEntries, |
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154 * totalEntries, and directory[]. |
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155 * For each ArchiveMember, fills in properties crc32, compressedSize, |
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156 * compressedData[]. |
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157 * |
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158 * Returns: array representing the entire archive. |
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159 */ |
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160 void[] build() |
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161 { uint i; |
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162 uint directoryOffset; |
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163 |
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164 if (comment.length > 0xFFFF) |
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165 throw new ZipException("archive comment longer than 65535"); |
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166 |
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167 // Compress each member; compute size |
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168 uint archiveSize = 0; |
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169 uint directorySize = 0; |
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170 foreach (ArchiveMember de; directory) |
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171 { |
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172 de.expandedSize = de.expandedData.length; |
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173 switch (de.compressionMethod) |
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174 { |
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175 case 0: |
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176 de.compressedData = de.expandedData; |
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177 break; |
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178 |
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179 case 8: |
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180 de.compressedData = cast(ubyte[])std.zlib.compress(cast(void[])de.expandedData); |
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181 de.compressedData = de.compressedData[2 .. de.compressedData.length - 4]; |
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182 break; |
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183 |
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184 default: |
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185 throw new ZipException("unsupported compression method"); |
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186 } |
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187 de.compressedSize = de.compressedData.length; |
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188 de.crc32 = std.zlib.crc32(0, cast(void[])de.expandedData); |
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189 |
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190 archiveSize += 30 + de.name.length + |
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191 de.extra.length + |
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192 de.compressedSize; |
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193 directorySize += 46 + de.name.length + |
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194 de.extra.length + |
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195 de.comment.length; |
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196 } |
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197 |
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198 data = new ubyte[archiveSize + directorySize + 22 + comment.length]; |
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199 |
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200 // Populate the data[] |
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201 |
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202 // Store each archive member |
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203 i = 0; |
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204 foreach (ArchiveMember de; directory) |
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205 { |
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206 de.offset = i; |
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207 data[i .. i + 4] = cast(ubyte[])"PK\x03\x04"; |
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208 putUshort(i + 4, de.extractVersion); |
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209 putUshort(i + 6, de.flags); |
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210 putUshort(i + 8, de.compressionMethod); |
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211 putUint (i + 10, cast(uint)de.time); |
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212 putUint (i + 14, de.crc32); |
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213 putUint (i + 18, de.compressedSize); |
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214 putUint (i + 22, de.expandedData.length); |
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215 putUshort(i + 26, cast(ushort)de.name.length); |
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216 putUshort(i + 28, cast(ushort)de.extra.length); |
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217 i += 30; |
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218 |
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219 data[i .. i + de.name.length] = cast(ubyte[])de.name[]; |
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220 i += de.name.length; |
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221 data[i .. i + de.extra.length] = cast(ubyte[])de.extra[]; |
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222 i += de.extra.length; |
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223 data[i .. i + de.compressedSize] = de.compressedData[]; |
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224 i += de.compressedSize; |
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225 } |
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226 |
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227 // Write directory |
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228 directoryOffset = i; |
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229 numEntries = 0; |
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230 foreach (ArchiveMember de; directory) |
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231 { |
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232 data[i .. i + 4] = cast(ubyte[])"PK\x01\x02"; |
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233 putUshort(i + 4, de.madeVersion); |
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234 putUshort(i + 6, de.extractVersion); |
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235 putUshort(i + 8, de.flags); |
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236 putUshort(i + 10, de.compressionMethod); |
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237 putUint (i + 12, cast(uint)de.time); |
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238 putUint (i + 16, de.crc32); |
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239 putUint (i + 20, de.compressedSize); |
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240 putUint (i + 24, de.expandedSize); |
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241 putUshort(i + 28, cast(ushort)de.name.length); |
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242 putUshort(i + 30, cast(ushort)de.extra.length); |
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243 putUshort(i + 32, cast(ushort)de.comment.length); |
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244 putUshort(i + 34, de.diskNumber); |
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245 putUshort(i + 36, de.internalAttributes); |
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246 putUint (i + 38, de.externalAttributes); |
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247 putUint (i + 42, de.offset); |
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248 i += 46; |
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249 |
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250 data[i .. i + de.name.length] = cast(ubyte[])de.name[]; |
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251 i += de.name.length; |
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252 data[i .. i + de.extra.length] = cast(ubyte[])de.extra[]; |
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253 i += de.extra.length; |
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254 data[i .. i + de.comment.length] = cast(ubyte[])de.comment[]; |
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255 i += de.comment.length; |
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256 numEntries++; |
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257 } |
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258 totalEntries = numEntries; |
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259 |
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260 // Write end record |
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261 endrecOffset = i; |
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262 data[i .. i + 4] = cast(ubyte[])"PK\x05\x06"; |
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263 putUshort(i + 4, cast(ushort)diskNumber); |
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264 putUshort(i + 6, cast(ushort)diskStartDir); |
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265 putUshort(i + 8, cast(ushort)numEntries); |
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266 putUshort(i + 10, cast(ushort)totalEntries); |
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267 putUint (i + 12, directorySize); |
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268 putUint (i + 16, directoryOffset); |
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269 putUshort(i + 20, cast(ushort)comment.length); |
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270 i += 22; |
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271 |
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272 // Write archive comment |
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273 assert(i + comment.length == data.length); |
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274 data[i .. data.length] = cast(ubyte[])comment[]; |
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275 |
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276 return cast(void[])data; |
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277 } |
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278 |
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279 /* ============ Reading an existing archive =================== */ |
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280 |
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281 /** |
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282 * Constructor to use when reading an existing archive. |
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283 * |
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284 * Fills in the properties data[], diskNumber, diskStartDir, numEntries, |
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285 * totalEntries, comment[], and directory[]. |
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286 * For each ArchiveMember, fills in |
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287 * properties madeVersion, extractVersion, flags, compressionMethod, time, |
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288 * crc32, compressedSize, expandedSize, compressedData[], diskNumber, |
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289 * internalAttributes, externalAttributes, name[], extra[], comment[]. |
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290 * Use expand() to get the expanded data for each ArchiveMember. |
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291 * |
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292 * Params: |
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293 * buffer = the entire contents of the archive. |
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294 */ |
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295 |
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296 this(void[] buffer) |
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297 { int iend; |
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298 int i; |
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299 int endcommentlength; |
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300 uint directorySize; |
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301 uint directoryOffset; |
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302 |
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303 this.data = cast(ubyte[]) buffer; |
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304 |
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305 // Find 'end record index' by searching backwards for signature |
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306 iend = data.length - 66000; |
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307 if (iend < 0) |
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308 iend = 0; |
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309 for (i = data.length - 22; 1; i--) |
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310 { |
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311 if (i < iend) |
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312 throw new ZipException("no end record"); |
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313 |
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314 if (data[i .. i + 4] == cast(ubyte[])"PK\x05\x06") |
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315 { |
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316 endcommentlength = getUshort(i + 20); |
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317 if (i + 22 + endcommentlength > data.length) |
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318 continue; |
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319 comment = cast(char[])data[i + 22 .. i + 22 + endcommentlength]; |
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320 endrecOffset = i; |
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321 break; |
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322 } |
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323 } |
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324 |
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325 // Read end record data |
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326 diskNumber = getUshort(i + 4); |
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327 diskStartDir = getUshort(i + 6); |
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328 |
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329 numEntries = getUshort(i + 8); |
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330 totalEntries = getUshort(i + 10); |
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331 |
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332 if (numEntries != totalEntries) |
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333 throw new ZipException("multiple disk zips not supported"); |
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334 |
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335 directorySize = getUint(i + 12); |
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336 directoryOffset = getUint(i + 16); |
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337 |
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338 if (directoryOffset + directorySize > i) |
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339 throw new ZipException("corrupted directory"); |
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340 |
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341 i = directoryOffset; |
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342 for (int n = 0; n < numEntries; n++) |
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343 { |
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344 /* The format of an entry is: |
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345 * 'PK' 1, 2 |
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346 * directory info |
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347 * path |
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348 * extra data |
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349 * comment |
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350 */ |
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351 |
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352 uint offset; |
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353 uint namelen; |
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354 uint extralen; |
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355 uint commentlen; |
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356 |
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357 if (data[i .. i + 4] != cast(ubyte[])"PK\x01\x02") |
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358 throw new ZipException("invalid directory entry 1"); |
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359 ArchiveMember de = new ArchiveMember(); |
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360 de.madeVersion = getUshort(i + 4); |
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361 de.extractVersion = getUshort(i + 6); |
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362 de.flags = getUshort(i + 8); |
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363 de.compressionMethod = getUshort(i + 10); |
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364 de.time = cast(DosFileTime)getUint(i + 12); |
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365 de.crc32 = getUint(i + 16); |
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366 de.compressedSize = getUint(i + 20); |
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367 de.expandedSize = getUint(i + 24); |
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368 namelen = getUshort(i + 28); |
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369 extralen = getUshort(i + 30); |
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370 commentlen = getUshort(i + 32); |
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371 de.diskNumber = getUshort(i + 34); |
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372 de.internalAttributes = getUshort(i + 36); |
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373 de.externalAttributes = getUint(i + 38); |
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374 de.offset = getUint(i + 42); |
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375 i += 46; |
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376 |
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377 if (i + namelen + extralen + commentlen > directoryOffset + directorySize) |
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378 throw new ZipException("invalid directory entry 2"); |
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379 |
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380 de.name = cast(char[])data[i .. i + namelen]; |
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381 i += namelen; |
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382 de.extra = data[i .. i + extralen]; |
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383 i += extralen; |
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384 de.comment = cast(char[])data[i .. i + commentlen]; |
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385 i += commentlen; |
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386 |
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387 directory[de.name] = de; |
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388 } |
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389 if (i != directoryOffset + directorySize) |
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390 throw new ZipException("invalid directory entry 3"); |
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391 } |
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392 |
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393 /***** |
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394 * Decompress the contents of archive member de and return the expanded |
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395 * data. |
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396 * |
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397 * Fills in properties extractVersion, flags, compressionMethod, time, |
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398 * crc32, compressedSize, expandedSize, expandedData[], name[], extra[]. |
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399 */ |
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400 ubyte[] expand(ArchiveMember de) |
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401 { uint namelen; |
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402 uint extralen; |
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403 |
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404 if (data[de.offset .. de.offset + 4] != cast(ubyte[])"PK\x03\x04") |
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405 throw new ZipException("invalid directory entry 4"); |
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406 |
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407 // These values should match what is in the main zip archive directory |
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408 de.extractVersion = getUshort(de.offset + 4); |
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409 de.flags = getUshort(de.offset + 6); |
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410 de.compressionMethod = getUshort(de.offset + 8); |
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411 de.time = cast(DosFileTime)getUint(de.offset + 10); |
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412 de.crc32 = getUint(de.offset + 14); |
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413 de.compressedSize = getUint(de.offset + 18); |
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414 de.expandedSize = getUint(de.offset + 22); |
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415 namelen = getUshort(de.offset + 26); |
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416 extralen = getUshort(de.offset + 28); |
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417 |
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418 debug(print) |
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419 { |
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420 printf("\t\texpandedSize = %d\n", de.expandedSize); |
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421 printf("\t\tcompressedSize = %d\n", de.compressedSize); |
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422 printf("\t\tnamelen = %d\n", namelen); |
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423 printf("\t\textralen = %d\n", extralen); |
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424 } |
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425 |
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426 if (de.flags & 1) |
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427 throw new ZipException("encryption not supported"); |
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428 |
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429 int i; |
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430 i = de.offset + 30 + namelen + extralen; |
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431 if (i + de.compressedSize > endrecOffset) |
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432 throw new ZipException("invalid directory entry 5"); |
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433 |
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434 de.compressedData = data[i .. i + de.compressedSize]; |
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435 debug(print) arrayPrint(de.compressedData); |
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436 |
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437 switch (de.compressionMethod) |
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438 { |
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439 case 0: |
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440 de.expandedData = de.compressedData; |
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441 return de.expandedData; |
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442 |
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443 case 8: |
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444 // -15 is a magic value used to decompress zip files. |
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445 // It has the effect of not requiring the 2 byte header |
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446 // and 4 byte trailer. |
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447 de.expandedData = cast(ubyte[])std.zlib.uncompress(cast(void[])de.compressedData, de.expandedSize, -15); |
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448 return de.expandedData; |
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|
449 |
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450 default: |
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451 throw new ZipException("unsupported compression method"); |
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452 } |
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453 assert(0); |
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454 } |
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|
455 |
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456 /* ============ Utility =================== */ |
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457 |
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458 ushort getUshort(int i) |
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|
459 { |
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|
460 version (LittleEndian) |
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|
461 { |
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462 return *cast(ushort *)&data[i]; |
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|
463 } |
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464 else |
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|
465 { |
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466 ubyte b0 = data[i]; |
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467 ubyte b1 = data[i + 1]; |
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468 return (b1 << 8) | b0; |
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|
469 } |
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470 } |
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|
471 |
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472 uint getUint(int i) |
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|
473 { |
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|
474 version (LittleEndian) |
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|
475 { |
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476 return *cast(uint *)&data[i]; |
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|
477 } |
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|
478 else |
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|
479 { |
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|
480 return bswap(*cast(uint *)&data[i]); |
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|
481 } |
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|
482 } |
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483 |
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484 void putUshort(int i, ushort us) |
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|
485 { |
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|
486 version (LittleEndian) |
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|
487 { |
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488 *cast(ushort *)&data[i] = us; |
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489 } |
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490 else |
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|
491 { |
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492 data[i] = cast(ubyte)us; |
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493 data[i + 1] = cast(ubyte)(us >> 8); |
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494 } |
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|
495 } |
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496 |
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497 void putUint(int i, uint ui) |
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|
498 { |
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|
499 version (BigEndian) |
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|
500 { |
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501 ui = bswap(ui); |
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|
502 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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503 *cast(uint *)&data[i] = ui; |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
504 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
505 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
506 |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
507 debug(print) |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
508 { |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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509 void arrayPrint(ubyte[] array) |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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changeset
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510 { |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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511 printf("array %p,%d\n", cast(void*)array, array.length); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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512 for (int i = 0; i < array.length; i++) |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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changeset
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513 { |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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514 printf("%02x ", array[i]); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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515 if (((i + 1) & 15) == 0) |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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516 printf("\n"); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
517 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
518 printf("\n"); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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519 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
520 } |