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73 lines
1.6 KiB
PHP
73 lines
1.6 KiB
PHP
<?php
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class GitPack
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{
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public $repo = null;
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public $index = null;
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public $pack_filename = "";
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function __construct($repo, $name)
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{
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$this->repo = $repo;
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$index_filename = "{$repo->path}/objects/pack/{$name}.idx";
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$this->pack_filename = "{$repo->path}/objects/pack/{$name}.pack";
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$this->index = new GitPackIndex(file_get_contents($index_filename));
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}
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function UnpackObject($sha)
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{
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if(isset($this->index->index[$sha]))
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{
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$start = $this->index->index[$sha];
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$file = fopen($this->pack_filename, "rb");
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fseek($file, $start);
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$header = ord(fread($file, 1));
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$type = ($header >> 4) & 7;
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$hasnext = ($header & 128) >> 7;
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$size = $header & 0xf;
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$offset = 4;
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while($hasnext)
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{
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$byte = ord(fread($file, 1));
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$size |= ($byte & 0x7f) << $offset;
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$hasnext = ($byte & 128) >> 7;
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$offset += 7;
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}
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switch($type)
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{
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case OBJ_COMMIT:
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case OBJ_TREE:
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case OBJ_BLOB:
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case OBJ_TAG:
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// this is a compressed object
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$data = fread($file, $size);
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$uncompressed = gzuncompress($data);
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if($uncompressed === false)
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{
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$uncompressed = $data;
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}
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return $this->repo->CreateObject($uncompressed, $type, $size);
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break;
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case OBJ_OFS_DELTA:
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case OBJ_REF_DELTA:
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// this is a delta
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throw new Exception("This is not yet implemented.");
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break;
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default:
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throw new GitUnknownTypeException("The object type is not supported.");
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}
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}
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else
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{
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throw new GitObjectNotFoundException("The specified object does not exist in this pack.");
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}
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}
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}
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