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Diffstat (limited to 'modules/getid3/module.lib.image_size.php')
| -rw-r--r-- | modules/getid3/module.lib.image_size.php | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/modules/getid3/module.lib.image_size.php b/modules/getid3/module.lib.image_size.php new file mode 100644 index 00000000..cde72234 --- /dev/null +++ b/modules/getid3/module.lib.image_size.php @@ -0,0 +1,126 @@ +<?php +// +----------------------------------------------------------------------+
+// | PHP version 5 |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 2 of the GPL license, |
+// | that is bundled with this package in the file license.txt and is |
+// | available through the world-wide-web at the following url: |
+// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+
+// | Authors: James Heinrich <infoØgetid3*org> |
+// | Allan Hansen <ahØartemis*dk> |
+// +----------------------------------------------------------------------+ +// | module.lib.data-hash.php | +// | getID3() library file. | +// | dependencies: NONE. | +// +----------------------------------------------------------------------+
+//
+// $Id: module.lib.image_size.php,v 1.2 2006/11/02 10:48:02 ah Exp $ + + + +class getid3_lib_image_size +{ + + const GIF_SIG = "\x47\x49\x46"; // 'GIF' + const PNG_SIG = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"; + const JPG_SIG = "\xFF\xD8\xFF"; + const JPG_SOS = "\xDA"; // Start Of Scan - image data start + const JPG_SOF0 = "\xC0"; // Start Of Frame N + const JPG_SOF1 = "\xC1"; // N indicates which compression process + const JPG_SOF2 = "\xC2"; // Only SOF0-SOF2 are now in common use + const JPG_SOF3 = "\xC3"; // NB: codes C4 and CC are *not* SOF markers + const JPG_SOF5 = "\xC5"; + const JPG_SOF6 = "\xC6"; + const JPG_SOF7 = "\xC7"; + const JPG_SOF9 = "\xC9"; + const JPG_SOF10 = "\xCA"; + const JPG_SOF11 = "\xCB"; // NB: codes C4 and CC are *not* SOF markers + const JPG_SOF13 = "\xCD"; + const JPG_SOF14 = "\xCE"; + const JPG_SOF15 = "\xCF"; + const JPG_EOI = "\xD9"; // End Of Image (end of datastream) + + + static public function get($img_data) { + + $height = $width = $type = ''; + + if ((substr($img_data, 0, 3) == getid3_lib_image_size::GIF_SIG) && (strlen($img_data) > 10)) { + + $dim = unpack('v2dim', substr($img_data, 6, 4)); + $width = $dim['dim1']; + $height = $dim['dim2']; + $type = 1; + + } elseif ((substr($img_data, 0, 8) == getid3_lib_image_size::PNG_SIG) && (strlen($img_data) > 24)) { + + $dim = unpack('N2dim', substr($img_data, 16, 8)); + $width = $dim['dim1']; + $height = $dim['dim2']; + $type = 3; + + } elseif ((substr($img_data, 0, 3) == getid3_lib_image_size::JPG_SIG) && (strlen($img_data) > 4)) { + + ///////////////// JPG CHUNK SCAN //////////////////// + $img_pos = $type = 2; + $buffer = strlen($img_data) - 2; + while ($img_pos < strlen($img_data)) { + + // synchronize to the marker 0xFF + $img_pos = strpos($img_data, 0xFF, $img_pos) + 1; + $marker = $img_data[$img_pos]; + do { + $marker = ord($img_data[$img_pos++]); + } while ($marker == 255); + + // find dimensions of block + switch (chr($marker)) { + + // Grab width/height from SOF segment (these are acceptable chunk types) + case getid3_lib_image_size::JPG_SOF0: + case getid3_lib_image_size::JPG_SOF1: + case getid3_lib_image_size::JPG_SOF2: + case getid3_lib_image_size::JPG_SOF3: + case getid3_lib_image_size::JPG_SOF5: + case getid3_lib_image_size::JPG_SOF6: + case getid3_lib_image_size::JPG_SOF7: + case getid3_lib_image_size::JPG_SOF9: + case getid3_lib_image_size::JPG_SOF10: + case getid3_lib_image_size::JPG_SOF11: + case getid3_lib_image_size::JPG_SOF13: + case getid3_lib_image_size::JPG_SOF14: + case getid3_lib_image_size::JPG_SOF15: + $dim = unpack('n2dim', substr($img_data, $img_pos + 3, 4)); + $height = $dim['dim1']; + $width = $dim['dim2']; + break 2; // found it so exit + + case getid3_lib_image_size::JPG_EOI: + case getid3_lib_image_size::JPG_SOS: + return false; + + default: // We're not interested in other markers + $skiplen = (ord($img_data[$img_pos++]) << 8) + ord($img_data[$img_pos++]) - 2; + // if the skip is more than what we've read in, read more + $buffer -= $skiplen; + if ($buffer < 512) { // if the buffer of data is too low, read more file. + return false; + } + $img_pos += $skiplen; + break; + } + } + } + + return array ($width, $height, $type); + } // end function + + +} + +?>
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