zlib - Cut string and gunzip using PHP -

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i have router config export file, contains header of 20 bytes, followed zlib compressed data. once uncompressed should contain plain xml content.

my code strips first 20 bytes, , decompresses file. exported data still binary. used file_get_contents , file_put_contents first, assumed (wrongly) wasn't binary-safe. i've tried change 20 in 1-1000 without avail.

<? $fp_orig        = fopen('config.cfg', "rb"); $data_orig      = fread($fp_orig, filesize('config.cfg')); fclose($fp_orig);  $bytes          = 20;  // tried 1-1000  $data_gz        = substr($data_orig,$bytes);  $fp_gz          = fopen('config.cfg.gz', 'w'); fwrite($fp_gz, $data_gz); fclose($fp_gz);  $fp_gz          = gzopen('config.cfg.gz', 'rb'); $fp_xml         = fopen('config.cfg.xml', 'wb');  while(!gzeof($fp_gz)) {   fwrite($fp_xml, gzread($fp_gz, 4096)); } fclose($fp_xml); gzclose($fp_gz);  echo file_get_contents('config.cfg.xml'); // gives binary data ?>

i'm not particularly looking turnkey working code, rather push right direction.


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