Here's a diff. See http://elliottback.com/wp/archives/2005/07/12/getting-wp-cache-to-work/ for more info:
24a25
> $meta_pathname = $cache_path . $meta_file;
28,35c29,38
< if( is_file($cache_file) ) {
< $cache_rnd = $cache_max_time/8;
< if (($mtime = @filemtime($cache_file)) == false) return;
< $cache_time_rnd = $cache_rnd/2 - rand(0, $cache_rnd); // To avoid thrashing when loaded
< if ($mtime + $cache_max_time > time() + $cache_time_rnd) {
< $meta = new CacheMeta;
< if (! ($meta = unserialize(@file_get_contents($cache_path . $meta_file))) ) return;
< foreach ($meta->headers as $header) {
---
> if( ($mtime = @filemtime($meta_pathname)) ) {
> if ($mtime + $cache_max_time > time() ) {
> $meta_obj = new CacheMeta;
>
> // Get META
> if (! ($meta_obj = unserialize(@file_get_contents($meta_pathname))) )
> return;
>
> // Send headers
> foreach ($meta_obj->headers as $header) {
38,40c41,50
< $log = "\n<!-- Cached page served by WP-Cache -->\n";
< if (! ($content_size = @filesize($cache_file)) > 0) return;
< if ($meta->dynamic) {
---
>
> // Sanity check
> if (! ($content_size = @filesize($cache_file)) > 0 || $mtime < @filemtime($cache_file))
> return;
>
> // GZIP
> $encoding = gzip_accepted();
> if (!$encoding){
> // Try to get cached file
> if ($meta_obj->dynamic) {
43d52
< $content_size += strlen($log);
45c54,55
< if(!@readfile ($cache_file)) return;
---
> if(!@readfile ($cache_file))
> return;
47c57,83
< echo $log;
---
> } else {
> // Try to get cached file
> if ($meta_obj->dynamic) {
> ob_start();
> include($cache_file);
> $contents = ob_get_contents();
> ob_end_clean();
> } else {
> $contents = file_get_contents($cache_file);
> }
>
> $gzdata = "\x1f\x8b\x08\x00\x00\x00\x00\x00"; // gzip header
> $size = strlen($contents);
> $crc = crc32($contents);
> $gzdata .= gzcompress($contents, 9);
> $gzdata = substr($gzdata, 0, strlen($gzdata) - 4); // fix crc bug
> $gzdata .= pack("V",$crc) . pack("V", $size);
> $gzsize = strlen($gzdata);
>
> Header('Content-Encoding: ' . $encoding);
> Header('Vary: Accept-Encoding');
> Header('Content-Length: ' . strlen($gzdata));
> Header('X-Content-Encoded-By: class.gzip_encode '.$this->_version);
>
> echo $gzdata;
> }
>
49a86
>
52a90,117
> /*
> * http://leknor.com/code/php/class.gzip_encode.0.62.php.txt
> *
> * gzip_accepted() - Test headers for Accept-Encoding: gzip
> *
> * Returns: if proper headers aren't found: false
> * if proper headers are found: 'gzip' or 'x-gzip'
> *
> * Tip: using this function you can test if the class will gzip the output
> * without actually compressing it yet, eg:
> * if (gzip_encode::gzip_accepted()) {
> * echo "Page will be gziped";
> * }
> * note the double colon syntax, I don't know where it is documented but
> * somehow it got in my brain.
> */
>
> function gzip_accepted() {
> global $HTTP_ACCEPT_ENCODING;
> if (strpos($HTTP_ACCEPT_ENCODING, 'gzip') === false) return false;
> if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') === false) {
> $encoding = 'gzip';
> } else {
> $encoding = 'x-gzip';
> }
>
> return $encoding;
> }
