php-getid3 1.9.15+dfsg-1 / usr / share / php / getid3 / module.graphic.gif.php

This file is indexed.

/usr/share/php/getid3/module.graphic.gif.php is in php-getid3 1.9.15+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below. 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.graphic.gif.php                                      //
// module for analyzing GIF Image files                        //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

// https://www.w3.org/Graphics/GIF/spec-gif89a.txt
// http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp

class getid3_gif extends getid3_handler
{

	public function Analyze() {
		$info = &$this->getid3->info;

		$info['fileformat']                  = 'gif';
		$info['video']['dataformat']         = 'gif';
		$info['video']['lossless']           = true;
		$info['video']['pixel_aspect_ratio'] = (float) 1;

		$this->fseek($info['avdataoffset']);
		$GIFheader = $this->fread(13);
		$offset = 0;

		$info['gif']['header']['raw']['identifier']            =                              substr($GIFheader, $offset, 3);
		$offset += 3;

		$magic = 'GIF';
		if ($info['gif']['header']['raw']['identifier'] != $magic) {
			$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"');
			unset($info['fileformat']);
			unset($info['gif']);
			return false;
		}

		$info['gif']['header']['raw']['version']               =                              substr($GIFheader, $offset, 3);
		$offset += 3;
		$info['gif']['header']['raw']['width']                 = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
		$offset += 2;
		$info['gif']['header']['raw']['height']                = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
		$offset += 2;
		$info['gif']['header']['raw']['flags']                 = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
		$offset += 1;
		$info['gif']['header']['raw']['bg_color_index']        = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
		$offset += 1;
		$info['gif']['header']['raw']['aspect_ratio']          = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
		$offset += 1;

		$info['video']['resolution_x']                         = $info['gif']['header']['raw']['width'];
		$info['video']['resolution_y']                         = $info['gif']['header']['raw']['height'];
		$info['gif']['version']                                = $info['gif']['header']['raw']['version'];
		$info['gif']['header']['flags']['global_color_table']  = (bool) ($info['gif']['header']['raw']['flags'] & 0x80);
		if ($info['gif']['header']['raw']['flags'] & 0x80) {
			// Number of bits per primary color available to the original image, minus 1
			$info['gif']['header']['bits_per_pixel']  = 3 * ((($info['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
		} else {
			$info['gif']['header']['bits_per_pixel']  = 0;
		}
		$info['gif']['header']['flags']['global_color_sorted'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x40);
		if ($info['gif']['header']['flags']['global_color_table']) {
			// the number of bytes contained in the Global Color Table. To determine that
			// actual size of the color table, raise 2 to [the value of the field + 1]
			$info['gif']['header']['global_color_size'] = pow(2, ($info['gif']['header']['raw']['flags'] & 0x07) + 1);
			$info['video']['bits_per_sample']           = ($info['gif']['header']['raw']['flags'] & 0x07) + 1;
		} else {
			$info['gif']['header']['global_color_size'] = 0;
		}
		if ($info['gif']['header']['raw']['aspect_ratio'] != 0) {
			// Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
			$info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
		}

		if ($info['gif']['header']['flags']['global_color_table']) {
			$GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
			$offset = 0;
			for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
				$red   = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
				$green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
				$blue  = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
				$info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
			}
		}

		// Image Descriptor
		while (!feof($this->getid3->fp)) {
			$NextBlockTest = $this->fread(1);
			switch ($NextBlockTest) {

/*
				case ',': // ',' - Image separator character
					$ImageDescriptorData = $NextBlockTest.$this->fread(9);
					$ImageDescriptor = array();
					$ImageDescriptor['image_left']   = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
					$ImageDescriptor['image_top']    = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
					$ImageDescriptor['image_width']  = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
					$ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
					$ImageDescriptor['flags_raw']    = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
					$ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
					$ImageDescriptor['flags']['image_interlaced']    = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
					$info['gif']['image_descriptor'][] = $ImageDescriptor;

					if ($ImageDescriptor['flags']['use_local_color_map']) {

						$this->warning('This version of getID3() cannot parse local color maps for GIFs');
						return true;

					}
					$RasterData = array();
					$RasterData['code_size']        = getid3_lib::LittleEndian2Int($this->fread(1));
					$RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
					$info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;

					$CurrentCodeSize = $RasterData['code_size'] + 1;
					for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
						$DefaultDataLookupTable[$i] = chr($i);
					}
					$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
					$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code

					$NextValue = $this->GetLSBits($CurrentCodeSize);
					echo 'Clear Code: '.$NextValue.'<BR>';

					$NextValue = $this->GetLSBits($CurrentCodeSize);
					echo 'First Color: '.$NextValue.'<BR>';

					$Prefix = $NextValue;
					$i = 0;
					while ($i++ < 20) {
						$NextValue = $this->GetLSBits($CurrentCodeSize);
						echo $NextValue.'<br>';
					}
					echo 'escaping<br>';
					return true;
					break;
*/

				case '!':
					// GIF Extension Block
					$ExtensionBlockData = $NextBlockTest.$this->fread(2);
					$ExtensionBlock = array();
					$ExtensionBlock['function_code']  = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
					$ExtensionBlock['byte_length']    = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
					$ExtensionBlock['data']           = (($ExtensionBlock['byte_length'] > 0) ? $this->fread($ExtensionBlock['byte_length']) : null);

					if (substr($ExtensionBlock['data'], 0, 11) == 'NETSCAPE2.0') { // Netscape Application Block (NAB)
						$ExtensionBlock['data'] .= $this->fread(4);
						if (substr($ExtensionBlock['data'], 11, 2) == "\x03\x01") {
							$info['gif']['animation']['animated']   = true;
							$info['gif']['animation']['loop_count'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlock['data'], 13, 2));
						} else {
							$this->warning('Expecting 03 01 at offset '.($this->ftell() - 4).', found "'.getid3_lib::PrintHexBytes(substr($ExtensionBlock['data'], 11, 2)).'"');
						}
					}

					$info['gif']['extension_blocks'][] = $ExtensionBlock;
					break;

				case ';':
					$info['gif']['terminator_offset'] = $this->ftell() - 1;
					// GIF Terminator
					break;

				default:
					break;


			}
		}

		return true;
	}


	public function GetLSBits($bits) {
		static $bitbuffer = '';
		while (strlen($bitbuffer) < $bits) {
			$bitbuffer = str_pad(decbin(ord($this->fread(1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
		}
		$value = bindec(substr($bitbuffer, 0 - $bits));
		$bitbuffer = substr($bitbuffer, 0, 0 - $bits);

		return $value;
	}

}

APT Browse - Built by Thomas Orozco.