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