80 lines
2.9 KiB
PHP
80 lines
2.9 KiB
PHP
<?php
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/**
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* Class Application_Common_FileIO contains helper functions for reading and writing files, and sending them over HTTP.
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*/
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class Application_Common_FileIO
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{
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/**
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* Reads the requested portion of a file and sends its contents to the client with the appropriate headers.
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*
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* This HTTP_RANGE compatible read file function is necessary for allowing streaming media to be skipped around in.
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*
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* @param string $filePath - the full filepath or URL pointing to the location of the file
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* @param string $mimeType - the file's mime type. Defaults to 'audio/mp3'
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* @param integer $size - the file size, in bytes
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* @return void
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*
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* @link https://groups.google.com/d/msg/jplayer/nSM2UmnSKKA/Hu76jDZS4xcJ
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* @link http://php.net/manual/en/function.readfile.php#86244
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*/
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public static function smartReadFile($filePath, $size, $mimeType)
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{
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$fm = @fopen($filePath, 'rb');
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if (!$fm) {
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throw new LibreTimeFileNotFoundException($filePath);
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}
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//Note that $size is allowed to be zero. If that's the case, it means we don't
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//know the filesize, and we just won't send the Content-Length header.
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if ($size < 0) {
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throw new Exception("Invalid file size returned for file at $filePath");
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}
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$begin = 0;
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$end = $size - 1;
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ob_start(); //Must start a buffer here for these header() functions
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if (isset($_SERVER['HTTP_RANGE'])) {
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if (preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches)) {
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$begin = intval($matches[1]);
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if (!empty($matches[2])) {
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$end = intval($matches[2]);
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}
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}
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}
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if (isset($_SERVER['HTTP_RANGE'])) {
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header('HTTP/1.1 206 Partial Content');
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} else {
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header('HTTP/1.1 200 OK');
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}
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header("Content-Type: $mimeType");
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header("Content-Transfer-Encoding: binary");
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header('Cache-Control: public, must-revalidate, max-age=0');
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header('Pragma: no-cache');
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header('Accept-Ranges: bytes');
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if ($size > 0) {
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header('Content-Length:' . (($end - $begin) + 1));
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if (isset($_SERVER['HTTP_RANGE'])) {
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header("Content-Range: bytes $begin-$end/$size");
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}
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}
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//We can have multiple levels of output buffering. Need to
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//keep looping until all have been disabled!!!
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//http://www.php.net/manual/en/function.ob-end-flush.php
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while (ob_get_level() > 0) {
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ob_end_flush();
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}
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// NOTE: We can't use fseek here because it does not work with streams
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// (a.k.a. Files stored in the cloud)
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while(!feof($fm) && (connection_status() == 0)) {
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echo fread($fm, 1024 * 8);
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}
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fclose($fm);
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}
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} |