rlm@3: <?php
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | PHP version 5 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | This source file is subject to version 2 of the GPL license, |
rlm@3: // | that is bundled with this package in the file license.txt and is |
rlm@3: // | available through the world-wide-web at the following url: |
rlm@3: // | http://www.gnu.org/copyleft/gpl.html |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Authors: James Heinrich <infoØgetid3*org> |
rlm@3: // | Allan Hansen <ahØartemis*dk> |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | module.lib.data-hash.php |
rlm@3: // | getID3() library file. |
rlm@3: // | dependencies: NONE. |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: //
rlm@3: // $Id: module.lib.image_size.php,v 1.2 2006/11/02 10:48:02 ah Exp $
rlm@3:
rlm@3:
rlm@3:
rlm@3: class getid3_lib_image_size
rlm@3: {
rlm@3:
rlm@3: const GIF_SIG = "\x47\x49\x46"; // 'GIF'
rlm@3: const PNG_SIG = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
rlm@3: const JPG_SIG = "\xFF\xD8\xFF";
rlm@3: const JPG_SOS = "\xDA"; // Start Of Scan - image data start
rlm@3: const JPG_SOF0 = "\xC0"; // Start Of Frame N
rlm@3: const JPG_SOF1 = "\xC1"; // N indicates which compression process
rlm@3: const JPG_SOF2 = "\xC2"; // Only SOF0-SOF2 are now in common use
rlm@3: const JPG_SOF3 = "\xC3"; // NB: codes C4 and CC are *not* SOF markers
rlm@3: const JPG_SOF5 = "\xC5";
rlm@3: const JPG_SOF6 = "\xC6";
rlm@3: const JPG_SOF7 = "\xC7";
rlm@3: const JPG_SOF9 = "\xC9";
rlm@3: const JPG_SOF10 = "\xCA";
rlm@3: const JPG_SOF11 = "\xCB"; // NB: codes C4 and CC are *not* SOF markers
rlm@3: const JPG_SOF13 = "\xCD";
rlm@3: const JPG_SOF14 = "\xCE";
rlm@3: const JPG_SOF15 = "\xCF";
rlm@3: const JPG_EOI = "\xD9"; // End Of Image (end of datastream)
rlm@3:
rlm@3:
rlm@3: static public function get($img_data) {
rlm@3:
rlm@3: $height = $width = $type = '';
rlm@3:
rlm@3: if ((substr($img_data, 0, 3) == getid3_lib_image_size::GIF_SIG) && (strlen($img_data) > 10)) {
rlm@3:
rlm@3: $dim = unpack('v2dim', substr($img_data, 6, 4));
rlm@3: $width = $dim['dim1'];
rlm@3: $height = $dim['dim2'];
rlm@3: $type = 1;
rlm@3:
rlm@3: } elseif ((substr($img_data, 0, 8) == getid3_lib_image_size::PNG_SIG) && (strlen($img_data) > 24)) {
rlm@3:
rlm@3: $dim = unpack('N2dim', substr($img_data, 16, 8));
rlm@3: $width = $dim['dim1'];
rlm@3: $height = $dim['dim2'];
rlm@3: $type = 3;
rlm@3:
rlm@3: } elseif ((substr($img_data, 0, 3) == getid3_lib_image_size::JPG_SIG) && (strlen($img_data) > 4)) {
rlm@3:
rlm@3: ///////////////// JPG CHUNK SCAN ////////////////////
rlm@3: $img_pos = $type = 2;
rlm@3: $buffer = strlen($img_data) - 2;
rlm@3: while ($img_pos < strlen($img_data)) {
rlm@3:
rlm@3: // synchronize to the marker 0xFF
rlm@3: $img_pos = strpos($img_data, 0xFF, $img_pos) + 1;
rlm@3: $marker = $img_data[$img_pos];
rlm@3: do {
rlm@3: $marker = ord($img_data[$img_pos++]);
rlm@3: } while ($marker == 255);
rlm@3:
rlm@3: // find dimensions of block
rlm@3: switch (chr($marker)) {
rlm@3:
rlm@3: // Grab width/height from SOF segment (these are acceptable chunk types)
rlm@3: case getid3_lib_image_size::JPG_SOF0:
rlm@3: case getid3_lib_image_size::JPG_SOF1:
rlm@3: case getid3_lib_image_size::JPG_SOF2:
rlm@3: case getid3_lib_image_size::JPG_SOF3:
rlm@3: case getid3_lib_image_size::JPG_SOF5:
rlm@3: case getid3_lib_image_size::JPG_SOF6:
rlm@3: case getid3_lib_image_size::JPG_SOF7:
rlm@3: case getid3_lib_image_size::JPG_SOF9:
rlm@3: case getid3_lib_image_size::JPG_SOF10:
rlm@3: case getid3_lib_image_size::JPG_SOF11:
rlm@3: case getid3_lib_image_size::JPG_SOF13:
rlm@3: case getid3_lib_image_size::JPG_SOF14:
rlm@3: case getid3_lib_image_size::JPG_SOF15:
rlm@3: $dim = unpack('n2dim', substr($img_data, $img_pos + 3, 4));
rlm@3: $height = $dim['dim1'];
rlm@3: $width = $dim['dim2'];
rlm@3: break 2; // found it so exit
rlm@3:
rlm@3: case getid3_lib_image_size::JPG_EOI:
rlm@3: case getid3_lib_image_size::JPG_SOS:
rlm@3: return false;
rlm@3:
rlm@3: default: // We're not interested in other markers
rlm@3: $skiplen = (ord($img_data[$img_pos++]) << 8) + ord($img_data[$img_pos++]) - 2;
rlm@3: // if the skip is more than what we've read in, read more
rlm@3: $buffer -= $skiplen;
rlm@3: if ($buffer < 512) { // if the buffer of data is too low, read more file.
rlm@3: return false;
rlm@3: }
rlm@3: $img_pos += $skiplen;
rlm@3: break;
rlm@3: }
rlm@3: }
rlm@3: }
rlm@3:
rlm@3: return array ($width, $height, $type);
rlm@3: } // end function
rlm@3:
rlm@3:
rlm@3: }
rlm@3:
rlm@3: ?>