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<?php
// Source: http://ibnuyahya.com/format-bytes-to-kb-mb-gb/
function format_bytes($size, $precision = 2){
$base = log($size) / log(1024);
$suffixes = array('B', 'KiB', 'MiB', 'GiB', 'TiB' , 'PiB' , 'EiB');
return round(pow(1024, $base - floor($base)), $precision) . $suffixes[floor($base)];
}
// Original source: http://www.phpfreaks.com/forums/index.php?topic=198274.msg895468#msg895468
function rangeDownload($file, $filename, $type)
{
$fp = @fopen($file, 'r');
$size = filesize($file); // File size
$length = $size; // Content length
$start = 0; // Start byte
$end = $size - 1; // End byte
// Now that we've gotten so far without errors we send the accept range header
/* At the moment we only support single ranges.
* Multiple ranges requires some more work to ensure it works correctly
* and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
*
* Multirange support annouces itself with:
* header('Accept-Ranges: bytes');
*
* Multirange content must be sent with multipart/byteranges mediatype,
* (mediatype = mimetype)
* as well as a boundry header to indicate the various chunks of data.
*/
header("Accept-Ranges: 0-$length");
// header('Accept-Ranges: bytes');
// multipart/byteranges
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
if (isset($_SERVER['HTTP_RANGE']))
{
$c_start = $start;
$c_end = $end;
// Extract the range string
list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
// Make sure the client hasn't sent us a multibyte range
if (strpos($range, ',') !== false)
{
// (?) Shoud this be issued here, or should the first
// range be used? Or should the header be ignored and
// we output the whole content?
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
// (?) Echo some info to the client?
exit;
}
// If the range starts with an '-' we start from the beginning
// If not, we forward the file pointer
// And make sure to get the end byte if spesified
if ($range{0} == '-')
{
// The n-number of the last bytes is requested
$c_start = $size - substr($range, 1);
}
else
{
$range = explode('-', $range);
$c_start = $range[0];
$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
}
/* Check the range and make sure it's treated according to the specs.
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
// End bytes can not be larger than $end.
$c_end = ($c_end > $end) ? $end : $c_end;
// Validate the requested range and return an error if it's not correct.
if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size)
{
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
// (?) Echo some info to the client?
exit;
}
$start = $c_start;
$end = $c_end;
$length = $end - $start + 1; // Calculate new content length
fseek($fp, $start);
header('HTTP/1.1 206 Partial Content');
}
// Notify the client the byte range we'll be outputting
header("Content-Range: bytes $start-$end/$size");
header("Content-Length: $length");
header("Content-disposition: inline; filename=\"".$filename."\"\n");
header("Content-Type: ".$type."\n");
// Start buffered download
$buffer = 1024 * 8;
while(!feof($fp) && ($p = ftell($fp)) <= $end)
{
if ($p + $buffer > $end)
{
// In case we're only outputtin a chunk, make sure we don't
// read past the length
$buffer = $end - $p + 1;
}
set_time_limit(0); // Reset time limit for big files
echo fread($fp, $buffer);
flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.
}
fclose($fp);
}
function even_odd($reset = false)
{
static $counter = 1;
if ($reset) {
$counter = 1;
}
if ($counter++%2 == 0) {
return 'even';
} else {
return 'odd';
}
}
// Source: http://hu.php.net/manual/en/function.str-pad.php#71558
// This is a multibyte enabled str_pad
function mb_str_pad($ps_input, $pn_pad_length, $ps_pad_string = " ", $pn_pad_type = STR_PAD_RIGHT, $ps_encoding = NULL)
{
$ret = "";
if (is_null($ps_encoding))
$ps_encoding = mb_internal_encoding();
$hn_length_of_padding = $pn_pad_length - mb_strlen($ps_input, $ps_encoding);
$hn_psLength = mb_strlen($ps_pad_string, $ps_encoding); // pad string length
if ($hn_psLength <= 0 || $hn_length_of_padding <= 0) {
// Padding string equal to 0:
//
$ret = $ps_input;
}
else {
$hn_repeatCount = floor($hn_length_of_padding / $hn_psLength); // how many times repeat
if ($pn_pad_type == STR_PAD_BOTH) {
$hs_lastStrLeft = "";
$hs_lastStrRight = "";
$hn_repeatCountLeft = $hn_repeatCountRight = ($hn_repeatCount - $hn_repeatCount % 2) / 2;
$hs_lastStrLength = $hn_length_of_padding - 2 * $hn_repeatCountLeft * $hn_psLength; // the rest length to pad
$hs_lastStrLeftLength = $hs_lastStrRightLength = floor($hs_lastStrLength / 2); // the rest length divide to 2 parts
$hs_lastStrRightLength += $hs_lastStrLength % 2; // the last char add to right side
$hs_lastStrLeft = mb_substr($ps_pad_string, 0, $hs_lastStrLeftLength, $ps_encoding);
$hs_lastStrRight = mb_substr($ps_pad_string, 0, $hs_lastStrRightLength, $ps_encoding);
$ret = str_repeat($ps_pad_string, $hn_repeatCountLeft) . $hs_lastStrLeft;
$ret .= $ps_input;
$ret .= str_repeat($ps_pad_string, $hn_repeatCountRight) . $hs_lastStrRight;
}
else {
$hs_lastStr = mb_substr($ps_pad_string, 0, $hn_length_of_padding % $hn_psLength, $ps_encoding); // last part of pad string
if ($pn_pad_type == STR_PAD_LEFT)
$ret = str_repeat($ps_pad_string, $hn_repeatCount) . $hs_lastStr . $ps_input;
else
$ret = $ps_input . str_repeat($ps_pad_string, $hn_repeatCount) . $hs_lastStr;
}
}
return $ret;
}
function is_cli_client()
{
// official client uses "fb-client/$version" as useragent
$clients = array("fb-client", "libcurl", "pyfb");
foreach ($clients as $client) {
if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], $client) !== false) {
return true;
}
}
return false;
}
function random_alphanum($min_length, $max_length = null)
{
$random = '';
$char_list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$char_list .= "abcdefghijklmnopqrstuvwxyz";
$char_list .= "1234567890";
if ($max_length === null) {
$max_length = $min_length;
}
$length = mt_rand($min_length, $max_length);
for($i = 0; $i < $max_length; $i++) {
if (strlen($random) == $length) break;
$random .= substr($char_list, mt_rand(0, strlen($char_list)), 1);
}
return $random;
}
# vim: set noet:
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