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1 files changed, 217 insertions, 0 deletions

diff --git a/includes/getid3/module.graphic.gif.php b/includes/getid3/module.graphic.gif.php
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+++ b/includes/getid3/module.graphic.gif.php
@@ -0,0 +1,217 @@
+<?php
+
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org>               //
+//  available at https://github.com/JamesHeinrich/getID3       //
+//            or https://www.getid3.org                        //
+//            or http://getid3.sourceforge.net                 //
+//  see readme.txt for more details                            //
+/////////////////////////////////////////////////////////////////
+//                                                             //
+// module.graphic.gif.php                                      //
+// module for analyzing GIF Image files                        //
+// dependencies: NONE                                          //
+//                                                            ///
+/////////////////////////////////////////////////////////////////
+
+/**
+ * @link https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ * @link http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
+ */
+
+if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
+	exit;
+}
+
+class getid3_gif extends getid3_handler
+{
+	/**
+	 * @return bool
+	 */
+	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;
+		}
+
+		//if (!$this->getid3->option_extra_info) {
+		//	$this->warning('GIF Extensions and Global Color Table not returned due to !getid3->option_extra_info');
+		//}
+
+		$info['gif']['header']['raw']['version']               =                              substr($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 * $info['gif']['header']['global_color_size']);
+			if ($this->getid3->option_extra_info) {
+				$offset = 0;
+				for ($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));
+					$info['gif']['global_color_table_rgb'][$i] = sprintf('%02X%02X%02X', $red, $green, $blue);
+				}
+			}
+		}
+
+		// Image Descriptor
+		$info['gif']['animation']['animated'] = false;
+		while (!feof($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($ExtensionBlock['data'], 11, 2)).'"');
+						}
+					}
+
+					if ($this->getid3->option_extra_info) {
+						$info['gif']['extension_blocks'][] = $ExtensionBlock;
+					}
+					break;
+
+				case ';':
+					$info['gif']['terminator_offset'] = $this->ftell() - 1;
+					// GIF Terminator
+					break;
+
+				default:
+					break;
+
+
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * @param int $bits
+	 *
+	 * @return float|int
+	 */
+	public function GetLSBits($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;
+	}
+
+}