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(PHP 4 >= 4.0.4, PHP 5)
gzinflate — Inflate a deflated string
This function inflate a deflated string.
The data compressed by gzdeflate().
The maximum length of data to decode.
The original uncompressed data or FALSE on error.
The function will return an error if the uncompressed data is more than 32768 times the length of the compressed input data or more than the optional parameter length.
Beispiel #1 gzinflate() example
<?php
$compressed = gzdeflate('Compress me', 9);
$uncompressed = gzinflate($compressed);
echo $uncompressed;
?>
You can use this to uncompress a string from Linux command line gzip by stripping the first 10 bytes:
<?php
$inflatedOutput = gzinflate(substr($output, 10, -8));
?>
The correct function for gzip and chunked data particularly when you get "Content-Encoding: gzip" and "Transfer-Encoding: chunked" headers:
<?php
function decode_gzip($h,$d,$rn="\r\n"){
if (isset($h['Transfer-Encoding'])){
$lrn = strlen($rn);
$str = '';
$ofs=0;
do{
$p = strpos($d,$rn,$ofs);
$len = hexdec(substr($d,$ofs,$p-$ofs));
$str .= substr($d,$p+$lrn,$len);
$ofs = $p+$lrn*2+$len;
}while ($d[$ofs]!=='0');
$d=$str;
}
if (isset($h['Content-Encoding'])) $d = gzinflate(substr($d,10));
return $d;
}
?>
Enjoy!
And when retrieving mod_deflate gzip'ed content and using gzinflate() to decode the data, be sure to strip the first 11 chars from the retrieved content.
<?php $dec = gzinflate(substr($enc,11)); ?>
Some gz string strip header and return inflated
It actualy processes some first member of the gz
See rfc1952 at http://www.faqs.org/rfcs/rfc1952.html for more details and improvment as gzdecode
<?php
function gzBody($gzData){
if(substr($gzData,0,3)=="\x1f\x8b\x08"){
$i=10;
$flg=ord(substr($gzData,3,1));
if($flg>0){
if($flg&4){
list($xlen)=unpack('v',substr($gzData,$i,2));
$i=$i+2+$xlen;
}
if($flg&8) $i=strpos($gzData,"\0",$i)+1;
if($flg&16) $i=strpos($gzData,"\0",$i)+1;
if($flg&2) $i=$i+2;
}
return gzinflate(substr($gzData,$i,-8));
}
else return false;
}
?>
This can be used to inflate streams compressed by the Java class java.util.zip.Deflater but you must strip the first 2 bytes off it. ( much like the above comment )
<?php $result = gzinflate(substr($compressedData, 2)); ?>
When retrieving mod_gzip'ed content and using gzinflate() to decode the data, be sure to strip the first 10 chars from the retrieved content.
<?php $dec = gzinflate(substr($enc,10)); ?>
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