mirror of
https://github.com/Yetangitu/ampache
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126 lines
No EOL
6.2 KiB
PHP
126 lines
No EOL
6.2 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.lib.data-hash.php |
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// | getID3() library file. |
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// | dependencies: NONE. |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.lib.image_size.php,v 1.2 2006/11/02 10:48:02 ah Exp $
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class getid3_lib_image_size
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{
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const GIF_SIG = "\x47\x49\x46"; // 'GIF'
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const PNG_SIG = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
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const JPG_SIG = "\xFF\xD8\xFF";
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const JPG_SOS = "\xDA"; // Start Of Scan - image data start
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const JPG_SOF0 = "\xC0"; // Start Of Frame N
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const JPG_SOF1 = "\xC1"; // N indicates which compression process
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const JPG_SOF2 = "\xC2"; // Only SOF0-SOF2 are now in common use
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const JPG_SOF3 = "\xC3"; // NB: codes C4 and CC are *not* SOF markers
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const JPG_SOF5 = "\xC5";
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const JPG_SOF6 = "\xC6";
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const JPG_SOF7 = "\xC7";
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const JPG_SOF9 = "\xC9";
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const JPG_SOF10 = "\xCA";
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const JPG_SOF11 = "\xCB"; // NB: codes C4 and CC are *not* SOF markers
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const JPG_SOF13 = "\xCD";
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const JPG_SOF14 = "\xCE";
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const JPG_SOF15 = "\xCF";
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const JPG_EOI = "\xD9"; // End Of Image (end of datastream)
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static public function get($img_data) {
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$height = $width = $type = '';
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if ((substr($img_data, 0, 3) == getid3_lib_image_size::GIF_SIG) && (strlen($img_data) > 10)) {
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$dim = unpack('v2dim', substr($img_data, 6, 4));
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$width = $dim['dim1'];
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$height = $dim['dim2'];
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$type = 1;
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} elseif ((substr($img_data, 0, 8) == getid3_lib_image_size::PNG_SIG) && (strlen($img_data) > 24)) {
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$dim = unpack('N2dim', substr($img_data, 16, 8));
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$width = $dim['dim1'];
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$height = $dim['dim2'];
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$type = 3;
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} elseif ((substr($img_data, 0, 3) == getid3_lib_image_size::JPG_SIG) && (strlen($img_data) > 4)) {
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///////////////// JPG CHUNK SCAN ////////////////////
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$img_pos = $type = 2;
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$buffer = strlen($img_data) - 2;
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while ($img_pos < strlen($img_data)) {
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// synchronize to the marker 0xFF
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$img_pos = strpos($img_data, 0xFF, $img_pos) + 1;
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$marker = $img_data[$img_pos];
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do {
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$marker = ord($img_data[$img_pos++]);
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} while ($marker == 255);
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// find dimensions of block
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switch (chr($marker)) {
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// Grab width/height from SOF segment (these are acceptable chunk types)
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case getid3_lib_image_size::JPG_SOF0:
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case getid3_lib_image_size::JPG_SOF1:
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case getid3_lib_image_size::JPG_SOF2:
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case getid3_lib_image_size::JPG_SOF3:
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case getid3_lib_image_size::JPG_SOF5:
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case getid3_lib_image_size::JPG_SOF6:
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case getid3_lib_image_size::JPG_SOF7:
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case getid3_lib_image_size::JPG_SOF9:
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case getid3_lib_image_size::JPG_SOF10:
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case getid3_lib_image_size::JPG_SOF11:
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case getid3_lib_image_size::JPG_SOF13:
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case getid3_lib_image_size::JPG_SOF14:
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case getid3_lib_image_size::JPG_SOF15:
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$dim = unpack('n2dim', substr($img_data, $img_pos + 3, 4));
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$height = $dim['dim1'];
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$width = $dim['dim2'];
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break 2; // found it so exit
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case getid3_lib_image_size::JPG_EOI:
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case getid3_lib_image_size::JPG_SOS:
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return false;
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default: // We're not interested in other markers
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$skiplen = (ord($img_data[$img_pos++]) << 8) + ord($img_data[$img_pos++]) - 2;
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// if the skip is more than what we've read in, read more
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$buffer -= $skiplen;
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if ($buffer < 512) { // if the buffer of data is too low, read more file.
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return false;
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}
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$img_pos += $skiplen;
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break;
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}
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}
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}
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return array ($width, $height, $type);
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} // end function
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}
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?>
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