75 lines
1.4 KiB
PHP
75 lines
1.4 KiB
PHP
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<?php
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define("PACK_IDX_SIGNATURE", "\377tOc");
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class GitPackIndex
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{
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public $rawdata = "";
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public $version = 0;
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public $index = array();
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function __construct($data)
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{
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$this->rawdata = $data;
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if(substr($data, 0, 4) == PACK_IDX_SIGNATURE)
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{
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$version = number_from_bin(substr($data, 4, 4));
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if($version == 2)
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{
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$this->version = $version;
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$offset = 8;
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$indexes = unpack("N*", substr($data, $offset, 256*4));
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$highest = 0;
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for($i = 0; $i < 256; $i++)
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{
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if(!isset($indexes[$i + 1]))
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{
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continue;
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}
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$n = $indexes[$i + 1];
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if($n < $highest)
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{
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throw new GitCorruptIndexException("The pack index file is corrupt.");
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}
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$highest = $n;
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}
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$offset = $offset + (256 * 4);
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$keys = array();
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$values = array();
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for($i = 0; $i < $highest; $i++)
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{
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$keys[] = sha1_from_bin(substr($data, $offset, 20));
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$offset += 20;
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}
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$offset += ($highest * 4);
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for($i = 0; $i < $highest; $i++)
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{
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$values[] = number_from_bin(substr($data, $offset, 4));
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$offset += 4;
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}
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$this->index = array_combine($keys, $values);
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}
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else
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{
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throw new GitUnsupportedVersionException("Version {$version} pack indexes are not supported by this version of the library.");
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}
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}
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else
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{
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throw new GitInvalidFormatException("The provided data does not look like a pack index file.");
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}
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}
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}
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