ecrire/inc/livrer_fichier.php ➔ spip_livrer_fichier_partie()

Complexity

Conditions	10
Paths	13

Size

Total Lines

96

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
function spip_livrer_fichier_partie($fichier, $range=null){
	if (!file_exists($fichier)){
		throw new \Exception(sprintf('File not found: %s', $fichier));
	}

	if (!is_readable($fichier)){
		throw new \Exception(sprintf('File not readable: %s', $fichier));
	}


	// Par defaut on envoie tout
	$byteOffset = 0;

$byteOffset is not used, you could remove the assignment.

	$byteLength = $fileSize = filesize($fichier);


	// Parse Content-Range header for byte offsets, looks like "bytes=11525-" OR "bytes=11525-12451"
	if ($range and preg_match('%bytes=(\d+)-(\d+)?%i', $range, $match)){
		### Offset signifies where we should begin to read the file
		$byteOffset = (int)$match[1];


		### Length is for how long we should read the file according to the browser, and can never go beyond the file size
		if (isset($match[2])){
			$finishBytes = (int)$match[2];
			$byteLength = $finishBytes+1;
		} else {
			$finishBytes = $fileSize-1;
		}

		$cr_header = sprintf('Content-Range: bytes %d-%d/%d', $byteOffset, $finishBytes, $fileSize);
	}
	else {
		// si pas de range valide, on delegue a la methode d'envoi complet
		spip_livrer_fichier_entier($fichier);
		// redondant, mais facilite la comprehension du code
		exit();
	}

	// Remove headers that might unnecessarily clutter up the output
	header_remove('Cache-Control');
	header_remove('Pragma');

	// partial content
	header("HTTP/1.1 206 Partial content");
	header($cr_header);  ### Decrease by 1 on byte-length since this definition is zero-based index of bytes being sent


	$byteRange = $byteLength-$byteOffset;

	header(sprintf('Content-Length: %d', $byteRange));

	// Variable containing the buffer
	$buffer = '';

$buffer is not used, you could remove the assignment.

	// Just a reasonable buffer size
	$bufferSize = 512*16;
	// Contains how much is left to read of the byteRange
	$bytePool = $byteRange;

	if (!$handle = fopen($fichier, 'r')){
		throw new \Exception(sprintf("Could not get handle for file %s", $fichier));
	}

	if (fseek($handle, $byteOffset, SEEK_SET)==-1){
		throw new \Exception(sprintf("Could not seek to byte offset %d", $byteOffset));
	}


	while ($bytePool>0){
		// How many bytes we request on this iteration
		$chunkSizeRequested = min($bufferSize, $bytePool);

		// Try readin $chunkSizeRequested bytes from $handle and put data in $buffer
		$buffer = fread($handle, $chunkSizeRequested);

		// Store how many bytes were actually read
		$chunkSizeActual = strlen($buffer);

		// If we didn't get any bytes that means something unexpected has happened since $bytePool should be zero already
		if ($chunkSizeActual==0){
			// For production servers this should go in your php error log, since it will break the output
			trigger_error('Chunksize became 0', E_USER_WARNING);
			break;
		}

		// Decrease byte pool with amount of bytes that were read during this iteration
		$bytePool -= $chunkSizeActual;

		// Write the buffer to output
		print $buffer;

		// Try to output the data to the client immediately
		flush();
	}

	exit();
}