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Uncompress a gzip file from CURL, on php

Posted by: admin April 23, 2020 Leave a comment

Questions:

Does anyone know how to uncompress the contents of a gzip file that i got with curl?

for example: http://torcache.com/torrent/63ABC1435AA5CD48DCD866C6F7D5E80766034391.torrent

responded

HTTP/1.1 200 OK
Server: nginx
Date: Wed, 09 Jun 2010 01:11:26 GMT
Content-Type: application/x-bittorrent
Content-Length: 52712
Last-Modified: Tue, 08 Jun 2010 15:09:58 GMT
Connection: keep-alive
Expires: Fri, 09 Jul 2010 01:11:26 GMT
Cache-Control: max-age=2592000
Content-Encoding: gzip
Accept-Ranges: bytes

then the compressed gzip,

i tried gzdecode but doesn’t work , gzeflate as well doesn’t they simply don’t get any response, and the contents of the files are no more than 2k

How to&Answers:

Use gzdecode:

<?php
    $c = file_get_contents("http://torcache.com/" .
        "torrent/63ABC1435AA5CD48DCD866C6F7D5E80766034391.torrent");
    echo gzdecode($c);

gives

d8:announce42:http://tracker.openbittorrent.com/announce13:announce-listll42
...

Answer:

Just tell cURL to decode the response automatically whenever it’s gzipped

curl_setopt($ch,CURLOPT_ENCODING, '');

Answer:

libcurl offers a feature that makes it decompress the contents automatically (if built with zlib).

See the CURLOPT_ACCEPT_ENCODING option: https://curl.haxx.se/libcurl/c/CURLOPT_ACCEPT_ENCODING.html

Answer:

Have you tried setting the header stating that you accept gzip encoding as follows?:

curl_setopt($rCurl, CURLOPT_HTTPHEADER, array('Accept-Encoding: gzip,deflate'));

Answer:

With a zlib Stream Wrapper:

file_get_contents("compress.zlib://http://torcache.com/" .
    "torrent/63ABC1435AA5CD48DCD866C6F7D5E80766034391.torrent");

Answer:

Have you tried gzuncompress or gzinflate?

gzdeflate compresses, the opposite of what you want. To be honest, I can’t figure out how gzdecode differs from normal uncompressing.

There’s also the cURL option CURLOPT_ENCODING:

The contents of the “Accept-Encoding: ” header. This enables decoding of the response. Supported encodings are “identity”, “deflate”, and “gzip”. If an empty string, “”, is set, a header containing all supported encoding types is sent.

It seems to mean it’ll automatically decompress the response, but I haven’t tested that.

Answer:

You can do it with gzinflate (pretending that $headers contains all your HTTP headers, and $buffer contains your data):

if (isset($headers['Content-Encoding']) && ($headers['Content-Encoding'] === 'gzip' || $headers['Content-Encoding'] === 'deflate'))
    {
        if ($headers['Content-Encoding'] === 'gzip')
        {
            $buffer = substr($buffer, 10);
        }
        $contents = @gzinflate($buffer);
        if ($contents === false)
        {
            return false;
        }
    }