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[ticket/9627] Split http_range_request() into several functions.

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Split http_range_request() into several functions for better reusability and
to allow some unit testing.

PHPBB3-9627
This commit is contained in:
Andreas Fischer
2010-10-14 00:30:29 +02:00
parent 7463a988ea
commit 3c61831010
1 changed files with 50 additions and 31 deletions
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81
phpBB/includes/functions_download.php
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@ -434,21 +434,14 @@ function file_gc()
* Allows browsers to request partial file content * Allows browsers to request partial file content
* in case a download has been interrupted. * in case a download has been interrupted.
* *
* A range request can contain multiple ranges,
* we however only handle the first request and
* only support requests from a given byte to the end of the file.
*
* @param int $filesize the size of the file in bytes we are about to deliver * @param int $filesize the size of the file in bytes we are about to deliver
* *
* @return mixed false if the whole file has to be delivered * @return mixed false if the whole file has to be delivered
* associative array on success * associative array on success
*
* @author bantu
*/ */
function http_byte_range($filesize) function http_byte_range($filesize)
{ {
// The range request array; // Only call find_range_request() once.
// contains all requested ranges.
static $request_array; static $request_array;
if (!$filesize) if (!$filesize)
@ -458,36 +451,62 @@ function http_byte_range($filesize)
if (!isset($request_array)) if (!isset($request_array))
{ {
$request_array = false; $request_array = find_range_request();
}
return (empty($request_array)) ? false : parse_range_request($request_array, $filesize);
}
$globals = array( /**
array('_SERVER', 'HTTP_RANGE'), * Searches for HTTP range request in super globals.
array('_ENV', 'HTTP_RANGE'), *
); * @return mixed false if no request found
* array of strings containing the requested ranges otherwise
* e.g. array(0 => '0-0', 1 => '123-125')
*/
function find_range_request()
{
$globals = array(
array('_SERVER', 'HTTP_RANGE'),
array('_ENV', 'HTTP_RANGE'),
);
foreach ($globals as $array) foreach ($globals as $array)
{
$global = $array[0];
$key = $array[1];
// Make sure range request starts with "bytes="
if (isset($GLOBALS[$global][$key]) && strpos($GLOBALS[$global][$key], 'bytes=') === 0)
{ {
$global = $array[0]; // Strip leading 'bytes='
$key = $array[1]; // Multiple ranges can be separated by a comma
return explode(',', substr($GLOBALS[$global][$key], 6));
// Make sure range request starts with "bytes="
if (isset($GLOBALS[$global][$key]) && strpos($GLOBALS[$global][$key], 'bytes=') === 0)
{
// Strip leading 'bytes='
// Multiple ranges can be separated by a comma
$request_array = explode(',', substr($GLOBALS[$global][$key], 6));
break;
}
} }
} }
// Return if no range requested return false;
if (empty($request_array)) }
{
return false;
}
/**
* Analyses a range request array.
*
* A range request can contain multiple ranges,
* we however only handle the first request and
* only support requests from a given byte to the end of the file.
*
* @param array $request_array array of strings containing the requested ranges
* @param int $filesize the full size of the file in bytes that has been requested
*
* @return mixed false if the whole file has to be delivered
* associative array on success
* byte_pos_start the first byte position, can be passed to fseek()
* byte_pos_end the last byte position
* bytes_requested the number of bytes requested
* bytes_total the full size of the file
*/
function parse_range_request($request_array, $filesize)
{
// Go through all ranges // Go through all ranges
foreach ($request_array as $range_string) foreach ($request_array as $range_string)
{ {