Re: gzuncompress() Not Working.
| From: | heavyccasey at gmail dot com | Date: | Wed, 07 Nov 2007 07:28:26 +0000 |
| Subject: | Re: gzuncompress() Not Working. | ||
| References: | 1 2 3 4 5 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-264165@lists.php.net to get a copy of this message | ||
The documentation for zlib says that it expects an Adler-32 checksum
at the end of the file.
PHP follows this [largely outdated] standard.
Python, on the other hand, doesn't, and uses a different checksum, CRC-32.
That's why it won't decompress. But I've written my own function and
it's working now. :)
function fixAdler32($data) {
$tempnam = tempnam('/tmp', 'gzfix');
$fh = fopen($tempnam, 'wb');
fwrite($fh, "\x1f\x8b\x08\x00\x00\x00\x00\x00" . $data);
fclose($fh);
$dat = '';
$gz = gzopen($tempnam, 'rb');
if ($gz == false) die('Error opening temporary GZ file.');
do {
$dat .= gzread($gz, 100000);
} while (!feof($gz));
gzclose($gz);
unlink($tempnam);
return $dat;
}
On Nov 6, 2007 11:07 PM, Per Jessen <per@computer.org> wrote:
> heavyccasey@gmail.com wrote:
>
> > Alright, I think I know the problem.
> >
> > PHP's gzuncompress uses the Adler-32 checksum at the end of the zlib,
> > while Python uses CRC32.
> >
> > Why must you follow the standards, PHP!?
> >
> > Does anyone know of any workaround?
>
> Are you saying that you've got compressed data in one format by Python
> that cannot be uncompressed by PHP because it expects another format?
>
>
>
> /Per Jessen, Zürich
>
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