How to file_get_contents a gzip page ?

Code:
&lt;?php 



function gzdecode($data) { 

  $len = strlen($data); 

  if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) { 

    return null;  // Not GZIP format (See RFC 1952) 

  } 

  $method = ord(substr($data,2,1));  // Compression method 

  $flags  = ord(substr($data,3,1));  // Flags 

  if ($flags & 31 != $flags) { 

    // Reserved bits are set -- NOT ALLOWED by RFC 1952 

    return null; 

  } 

  // NOTE: $mtime may be negative (PHP integer limitations) 

  $mtime = unpack("V", substr($data,4,4)); 

  $mtime = $mtime[1]; 

  $xfl   = substr($data,8,1); 

  $os    = substr($data,8,1); 

  $headerlen = 10; 

  $extralen  = 0; 

  $extra     = ""; 

  if ($flags & 4) { 

    // 2-byte length prefixed EXTRA data in header 

    if ($len - $headerlen - 2 < 8) { 

      return false;    // Invalid format 

    } 

    $extralen = unpack("v",substr($data,8,2)); 

    $extralen = $extralen[1]; 

    if ($len - $headerlen - 2 - $extralen < 8) { 

      return false;    // Invalid format 

    } 

    $extra = substr($data,10,$extralen); 

    $headerlen += 2 + $extralen; 

  } 



  $filenamelen = 0; 

  $filename = ""; 

  if ($flags & 8) { 

    // C-style string file NAME data in header 

    if ($len - $headerlen - 1 < 8) { 

      return false;    // Invalid format 

    } 

    $filenamelen = strpos(substr($data,8+$extralen),chr(0)); 

    if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) { 

      return false;    // Invalid format 

    } 

    $filename = substr($data,$headerlen,$filenamelen); 

    $headerlen += $filenamelen + 1; 

  } 



  $commentlen = 0; 

  $comment = ""; 

  if ($flags & 16) { 

    // C-style string COMMENT data in header 

    if ($len - $headerlen - 1 < 8) { 

      return false;    // Invalid format 

    } 

    $commentlen = strpos(substr($data,8+$extralen+$filenamelen),chr(0)); 

    if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) { 

      return false;    // Invalid header format 

    } 

    $comment = substr($data,$headerlen,$commentlen); 

    $headerlen += $commentlen + 1; 

  } 



  $headercrc = ""; 

  if ($flags & 1) { 

    // 2-bytes (lowest order) of CRC32 on header present 

    if ($len - $headerlen - 2 < 8) { 

      return false;    // Invalid format 

    } 

    $calccrc = crc32(substr($data,0,$headerlen)) & 0xffff; 

    $headercrc = unpack("v", substr($data,$headerlen,2)); 

    $headercrc = $headercrc[1]; 

    if ($headercrc != $calccrc) { 

      return false;    // Bad header CRC 

    } 

    $headerlen += 2; 

  } 



  // GZIP FOOTER - These be negative due to PHP's limitations 

  $datacrc = unpack("V",substr($data,-8,4)); 

  $datacrc = $datacrc[1]; 

  $isize = unpack("V",substr($data,-4)); 

  $isize = $isize[1]; 



  // Perform the decompression: 

  $bodylen = $len-$headerlen-8; 

  if ($bodylen < 1) { 

    // This should never happen - IMPLEMENTATION BUG! 

    return null; 

  } 

  $body = substr($data,$headerlen,$bodylen); 

  $data = ""; 

  if ($bodylen > 0) { 

    switch ($method) { 

      case 8: 

        // Currently the only supported compression method: 

        $data = gzinflate($body); 

        break; 

      default: 

        // Unknown compression method 

        return false; 

    } 

  } else { 

    // I'm not sure if zero-byte body content is allowed. 

    // Allow it for now...  Do nothing... 

  } 



  // Verifiy decompressed size and CRC32: 

  // NOTE: This may fail with large data sizes depending on how 

  //       PHP's integer limitations affect strlen() since $isize 

  //       may be negative for large sizes. 

  if ($isize != strlen($data) || crc32($data) != $datacrc) { 

    // Bad format!  Length or CRC doesn't match! 

    return false; 

  } 

  return $data; 

} 



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