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- We only write to the archive ONCE for every file and folder when working with tar files

Browse source 
- Checksum is faster, uses some precomputation to speed things up
- We only needed to pad the end of the archive with 512 nulls, not 1024 :D
- Added some comments regarding the other fields ;-)


git-svn-id: file:///svn/phpbb/trunk@5581 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
David M 2006-02-24 18:27:56 +00:00
parent 724b37ae97
commit 73a2c56104
1 changed files with 25 additions and 26 deletions
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51
phpBB/includes/functions_compress.php
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@ -477,7 +477,7 @@ class compress_tar extends compress
if ($this->wrote)
{
$fzwrite = ($this->isbz && function_exists('bzwrite')) ? 'bzwrite' : (($this->isgz && extension_loaded('zlib')) ? 'gzwrite' : 'fwrite');
$fzwrite($this->fp, pack("a1024", ""));
$fzwrite($this->fp, pack("a512", "")); // Symbolizes that there are no more files
}
$fzclose($this->fp);
@ -492,39 +492,38 @@ class compress_tar extends compress
// This is the header data, it contains all the info we know about the file or folder that we are about to archive
$header = '';
$header .= pack("a100", $name);
$header .= pack("a8", sprintf("%07o", $stat[2]));
$header .= pack("a8", sprintf("%07o", $stat[4]));
$header .= pack("a8", sprintf("%07o", $stat[5]));
$header .= pack("a12", sprintf("%011o", $stat[7]));
$header .= pack("a12", sprintf("%011o", $stat[9]));
$header .= pack("a8", ' ');
$header .= pack("a1", $typeflag);
$header .= pack("a100", '');
$header .= pack("a6", 'ustar');
$header .= pack("a2", '00');
$header .= pack("a32", 'Unknown');
$header .= pack("a32", 'Unknown');
$header .= pack("a8", '');
$header .= pack("a8", '');
$header .= pack("a155", '');
$header .= pack("a12", '');
$header .= pack("a100", $name); // file name
$header .= pack("a8", sprintf("%07o", $stat[2])); // file mode
$header .= pack("a8", sprintf("%07o", $stat[4])); // owner id
$header .= pack("a8", sprintf("%07o", $stat[5])); // group id
$header .= pack("a12", sprintf("%011o", $stat[7])); // file size
$header .= pack("a12", sprintf("%011o", $stat[9])); // last mod time
// Checksum
$checksum = 0;
for ($i = 0; $i < 329; $i++)
for ($i = 0; $i < 148; $i++)
{
$checksum += ord(substr($header, $i, 1));
}
$header = substr_replace($header, pack("a8", sprintf("%07o", $checksum)), 148, 8);
$fzwrite($this->fp, $header);
// We precompute the rest of the hash, this saves us time in the loop and allows us to insert our hash without resorting to string functions
$checksum += 2415 + (($is_dir) ? 53 : 0);
if ($stat[7] !== 0 && !$is_dir)
{
$fzwrite($this->fp, $data . (($stat[7] % 512 > 0) ? str_repeat("\0", 512 - $stat[7] % 512) : ''));
unset($data);
}
$header .= pack("a8", sprintf("%07o", $checksum)); // checksum
$header .= pack("a1", $typeflag); // link indicator
$header .= pack("a100", ''); // name of linked file
$header .= pack("a6", 'ustar'); // ustar indicator
$header .= pack("a2", '00'); // ustar version
$header .= pack("a32", 'Unknown'); // owner name
$header .= pack("a32", 'Unknown'); // group name
$header .= pack("a8", ''); // device major number
$header .= pack("a8", ''); // device minor number
$header .= pack("a155", ''); // filename prefix
$header .= pack("a12", ''); // end
// This writes the entire file in one shot. Header, followed by data and then null padded to a multiple of 512
$fzwrite($this->fp, $header . (($stat[7] !== 0 && !$is_dir) ? $data . (($stat[7] % 512 > 0) ? str_repeat("\0", 512 - $stat[7] % 512) : '') : ''));
unset($data);
}
function open()