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<?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 <info�getid3*org> | |
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// | Allan Hansen <ah�artemis*dk> | |
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// +----------------------------------------------------------------------+ |
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// | module.graphic.tiff.php | |
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// | Module for analyzing TIFF graphic files. | |
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// | dependencies: NONE | |
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// +----------------------------------------------------------------------+ |
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// |
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// $Id: module.graphic.tiff.php,v 1.2 2006/11/02 10:48:02 ah Exp $ |
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class getid3_tiff extends getid3_handler |
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{ |
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public function Analyze() |
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{ |
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$getid3 = $this->getid3; |
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fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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$tiff_header = fread($getid3->fp, 4); |
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$getid3->info['tiff']['byte_order'] = 'II' == substr($tiff_header, 0, 2) ? 'Intel' : 'Motorola'; |
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$endian2int = 'II' == substr($tiff_header, 0, 2) ? 'LittleEndian2Int' : 'BigEndian2Int'; |
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$getid3->info['fileformat'] = 'tiff'; |
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$getid3->info['video']['dataformat'] = 'tiff'; |
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$getid3->info['video']['lossless'] = true; |
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$getid3->info['tiff']['ifd'] = []; |
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$current_ifd = []; |
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$field_type_byte_length = [1 => 1, 2 => 1, 3 => 2, 4 => 4, 5 => 8]; |
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$next_ifd_offset = getid3_lib::$endian2int(fread($getid3->fp, 4)); |
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while ($next_ifd_offset > 0) { |
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$current_ifd['offset'] = $next_ifd_offset; |
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fseek($getid3->fp, $getid3->info['avdataoffset'] + $next_ifd_offset, SEEK_SET); |
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$current_ifd['fieldcount'] = getid3_lib::$endian2int(fread($getid3->fp, 2)); |
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for ($i = 0; $i < $current_ifd['fieldcount']; $i++) { |
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// shortcut |
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$current_ifd['fields'][$i] = []; |
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$current_ifd_fields_i = &$current_ifd['fields'][$i]; |
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$current_ifd_fields_i['raw']['tag'] = getid3_lib::$endian2int(fread($getid3->fp, 2)); |
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$current_ifd_fields_i['raw']['type'] = getid3_lib::$endian2int(fread($getid3->fp, 2)); |
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$current_ifd_fields_i['raw']['length'] = getid3_lib::$endian2int(fread($getid3->fp, 4)); |
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$current_ifd_fields_i['raw']['offset'] = fread($getid3->fp, 4); |
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switch ($current_ifd_fields_i['raw']['type']) { |
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case 1: // BYTE An 8-bit unsigned integer. |
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if ($current_ifd_fields_i['raw']['length'] <= 4) { |
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$current_ifd_fields_i['value'] = getid3_lib::$endian2int(substr($current_ifd_fields_i['raw']['offset'], 0, 1)); |
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} else { |
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$current_ifd_fields_i['offset'] = getid3_lib::$endian2int($current_ifd_fields_i['raw']['offset']); |
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} |
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break; |
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case 2: // ASCII 8-bit bytes that store ASCII codes; the last byte must be null. |
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if ($current_ifd_fields_i['raw']['length'] <= 4) { |
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$current_ifd_fields_i['value'] = substr($current_ifd_fields_i['raw']['offset'], 3); |
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} else { |
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$current_ifd_fields_i['offset'] = getid3_lib::$endian2int($current_ifd_fields_i['raw']['offset']); |
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} |
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break; |
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case 3: // SHORT A 16-bit (2-byte) unsigned integer. |
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if ($current_ifd_fields_i['raw']['length'] <= 2) { |
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$current_ifd_fields_i['value'] = getid3_lib::$endian2int(substr($current_ifd_fields_i['raw']['offset'], 0, 2)); |
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} else { |
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$current_ifd_fields_i['offset'] = getid3_lib::$endian2int($current_ifd_fields_i['raw']['offset']); |
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} |
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break; |
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case 4: // LONG A 32-bit (4-byte) unsigned integer. |
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if ($current_ifd_fields_i['raw']['length'] <= 1) { |
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$current_ifd_fields_i['value'] = getid3_lib::$endian2int($current_ifd_fields_i['raw']['offset']); |
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} else { |
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$current_ifd_fields_i['offset'] = getid3_lib::$endian2int($current_ifd_fields_i['raw']['offset']); |
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} |
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break; |
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case 5: // RATIONAL Two LONG_s: the first represents the numerator of a fraction, the second the denominator. |
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break; |
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} |
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} |
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$getid3->info['tiff']['ifd'][] = $current_ifd; |
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$current_ifd = []; |
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$next_ifd_offset = getid3_lib::$endian2int(fread($getid3->fp, 4)); |
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} |
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foreach ($getid3->info['tiff']['ifd'] as $ifd_id => $ifd_array) { |
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foreach ($ifd_array['fields'] as $key => $field_array) { |
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switch ($field_array['raw']['tag']) { |
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case 256: // ImageWidth |
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case 257: // ImageLength |
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case 258: // BitsPerSample |
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case 259: // Compression |
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if (!isset($field_array['value'])) { |
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fseek($getid3->fp, $field_array['offset'], SEEK_SET); |
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$getid3->info['tiff']['ifd'][$ifd_id]['fields'][$key]['raw']['data'] = fread($getid3->fp, $field_array['raw']['length'] * $field_type_byte_length[$field_array['raw']['type']]); |
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} |
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break; |
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case 270: // ImageDescription |
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case 271: // Make |
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case 272: // Model |
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case 305: // Software |
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case 306: // DateTime |
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case 315: // Artist |
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case 316: // HostComputer |
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if (isset($field_array['value'])) { |
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$getid3->info['tiff']['ifd'][$ifd_id]['fields'][$key]['raw']['data'] = $field_array['value']; |
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} else { |
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fseek($getid3->fp, $field_array['offset'], SEEK_SET); |
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$getid3->info['tiff']['ifd'][$ifd_id]['fields'][$key]['raw']['data'] = fread($getid3->fp, $field_array['raw']['length'] * $field_type_byte_length[$field_array['raw']['type']]); |
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} |
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break; |
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} |
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switch ($field_array['raw']['tag']) { |
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case 256: // ImageWidth |
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$getid3->info['video']['resolution_x'] = $field_array['value']; |
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break; |
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case 257: // ImageLength |
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$getid3->info['video']['resolution_y'] = $field_array['value']; |
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break; |
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case 258: // BitsPerSample |
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if (isset($field_array['value'])) { |
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$getid3->info['video']['bits_per_sample'] = $field_array['value']; |
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} else { |
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$getid3->info['video']['bits_per_sample'] = 0; |
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for ($i = 0; $i < $field_array['raw']['length']; $i++) { |
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$getid3->info['video']['bits_per_sample'] += getid3_lib::$endian2int(substr($getid3->info['tiff']['ifd'][$ifd_id]['fields'][$key]['raw']['data'], $i * $field_type_byte_length[$field_array['raw']['type']], $field_type_byte_length[$field_array['raw']['type']])); |
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} |
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} |
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break; |
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case 259: // Compression |
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$getid3->info['video']['codec'] = getid3_tiff::TIFFcompressionMethod($field_array['value']); |
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break; |
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case 270: // ImageDescription |
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case 271: // Make |
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case 272: // Model |
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case 305: // Software |
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case 306: // DateTime |
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case 315: // Artist |
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case 316: // HostComputer |
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@$getid3->info['tiff']['comments'][getid3_tiff::TIFFcommentName($field_array['raw']['tag'])][] = $getid3->info['tiff']['ifd'][$ifd_id]['fields'][$key]['raw']['data']; |
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break; |
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default: |
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break; |
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} |
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} |
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} |
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return true; |
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} |
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public static function TIFFcompressionMethod($id) |
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{ |
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static $lookup = [ |
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1 => 'Uncompressed', |
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2 => 'Huffman', |
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3 => 'Fax - CCITT 3', |
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5 => 'LZW', |
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32773 => 'PackBits', |
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]; |
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return (isset($lookup[$id]) ? $lookup[$id] : 'unknown/invalid (' . $id . ')'); |
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} |
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public static function TIFFcommentName($id) |
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{ |
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static $lookup = [ |
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270 => 'imagedescription', |
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271 => 'make', |
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272 => 'model', |
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305 => 'software', |
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306 => 'datetime', |
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315 => 'artist', |
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316 => 'hostcomputer', |
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]; |
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return (isset($lookup[$id]) ? $lookup[$id] : 'unknown/invalid (' . $id . ')'); |
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} |
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} |
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mambax7 /
xoopseditors
