236 lines
9.8 KiB
PHP
236 lines
9.8 KiB
PHP
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// see readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.graphic.gif.php //
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// module for analyzing GIF Image files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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/**
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* @link https://www.w3.org/Graphics/GIF/spec-gif89a.txt
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* @link http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
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* @link http://www.vurdalakov.net/misc/gif/netscape-looping-application-extension
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*/
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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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class getid3_gif extends getid3_handler
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{
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'gif';
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$info['video']['dataformat'] = 'gif';
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$info['video']['lossless'] = true;
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$info['video']['pixel_aspect_ratio'] = (float) 1;
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$this->fseek($info['avdataoffset']);
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$GIFheader = $this->fread(13);
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$offset = 0;
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$info['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3);
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$offset += 3;
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$magic = 'GIF';
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if ($info['gif']['header']['raw']['identifier'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"');
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unset($info['fileformat']);
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unset($info['gif']);
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return false;
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}
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//if (!$this->getid3->option_extra_info) {
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// $this->warning('GIF Extensions and Global Color Table not returned due to !getid3->option_extra_info');
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//}
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$info['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3);
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$offset += 3;
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$info['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
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$offset += 2;
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$info['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
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$offset += 2;
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$info['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
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$offset += 1;
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$info['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
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$offset += 1;
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$info['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
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$offset += 1;
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$info['video']['resolution_x'] = $info['gif']['header']['raw']['width'];
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$info['video']['resolution_y'] = $info['gif']['header']['raw']['height'];
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$info['gif']['version'] = $info['gif']['header']['raw']['version'];
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$info['gif']['header']['flags']['global_color_table'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x80);
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if ($info['gif']['header']['raw']['flags'] & 0x80) {
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// Number of bits per primary color available to the original image, minus 1
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$info['gif']['header']['bits_per_pixel'] = 3 * ((($info['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
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} else {
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$info['gif']['header']['bits_per_pixel'] = 0;
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}
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$info['gif']['header']['flags']['global_color_sorted'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x40);
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if ($info['gif']['header']['flags']['global_color_table']) {
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// the number of bytes contained in the Global Color Table. To determine that
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// actual size of the color table, raise 2 to [the value of the field + 1]
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$info['gif']['header']['global_color_size'] = pow(2, ($info['gif']['header']['raw']['flags'] & 0x07) + 1);
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$info['video']['bits_per_sample'] = ($info['gif']['header']['raw']['flags'] & 0x07) + 1;
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} else {
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$info['gif']['header']['global_color_size'] = 0;
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}
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if ($info['gif']['header']['raw']['aspect_ratio'] != 0) {
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// Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
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$info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
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}
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if ($info['gif']['header']['flags']['global_color_table']) {
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$GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
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if ($this->getid3->option_extra_info) {
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$offset = 0;
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for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
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$red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
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$green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
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$blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
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$info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
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$info['gif']['global_color_table_rgb'][$i] = sprintf('%02X%02X%02X', $red, $green, $blue);
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}
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}
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}
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// Image Descriptor
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$info['gif']['animation']['animated'] = false;
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while (!feof($this->getid3->fp)) {
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$NextBlockTest = $this->fread(1);
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switch ($NextBlockTest) {
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/*
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case ',': // ',' - Image separator character
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$ImageDescriptorData = $NextBlockTest.$this->fread(9);
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$ImageDescriptor = array();
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$ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
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$ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
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$ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
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$ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
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$ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
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$ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
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$ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
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$info['gif']['image_descriptor'][] = $ImageDescriptor;
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if ($ImageDescriptor['flags']['use_local_color_map']) {
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$this->warning('This version of getID3() cannot parse local color maps for GIFs');
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return true;
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}
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$RasterData = array();
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$RasterData['code_size'] = getid3_lib::LittleEndian2Int($this->fread(1));
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$RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
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$info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
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$CurrentCodeSize = $RasterData['code_size'] + 1;
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for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
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$DefaultDataLookupTable[$i] = chr($i);
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}
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$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
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$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
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$NextValue = $this->GetLSBits($CurrentCodeSize);
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echo 'Clear Code: '.$NextValue.'<BR>';
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$NextValue = $this->GetLSBits($CurrentCodeSize);
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echo 'First Color: '.$NextValue.'<BR>';
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$Prefix = $NextValue;
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$i = 0;
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while ($i++ < 20) {
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$NextValue = $this->GetLSBits($CurrentCodeSize);
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echo $NextValue.'<br>';
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}
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echo 'escaping<br>';
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return true;
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break;
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*/
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case '!':
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// GIF Extension Block
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$ExtensionBlockData = $NextBlockTest.$this->fread(2);
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$ExtensionBlock = array();
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$ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
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$ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
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$ExtensionBlock['data'] = (($ExtensionBlock['byte_length'] > 0) ? $this->fread($ExtensionBlock['byte_length']) : null);
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switch ($ExtensionBlock['function_code']) {
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case 0xFF:
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// Application Extension
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if ($ExtensionBlock['byte_length'] != 11) {
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$this->warning('Expected block size of the Application Extension is 11 bytes, found '.$ExtensionBlock['byte_length'].' at offset '.$this->ftell());
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break;
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}
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if (substr($ExtensionBlock['data'], 0, 11) !== 'NETSCAPE2.0'
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&& substr($ExtensionBlock['data'], 0, 11) !== 'ANIMEXTS1.0'
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) {
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$this->warning('Ignoring unsupported Application Extension '.substr($ExtensionBlock['data'], 0, 11));
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break;
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}
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// Netscape Application Block (NAB)
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$ExtensionBlock['data'] .= $this->fread(4);
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if (substr($ExtensionBlock['data'], 11, 2) == "\x03\x01") {
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$info['gif']['animation']['animated'] = true;
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$info['gif']['animation']['loop_count'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlock['data'], 13, 2));
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} else {
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$this->warning('Expecting 03 01 at offset '.($this->ftell() - 4).', found "'.getid3_lib::PrintHexBytes(substr($ExtensionBlock['data'], 11, 2)).'"');
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}
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break;
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}
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if ($this->getid3->option_extra_info) {
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$info['gif']['extension_blocks'][] = $ExtensionBlock;
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}
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break;
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case ';':
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$info['gif']['terminator_offset'] = $this->ftell() - 1;
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// GIF Terminator
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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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return true;
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}
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/**
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* @param int $bits
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*
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* @return float|int
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*/
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public function GetLSBits($bits) {
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static $bitbuffer = '';
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while (strlen($bitbuffer) < $bits) {
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$bitbuffer = str_pad(decbin(ord($this->fread(1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
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}
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$value = bindec(substr($bitbuffer, 0 - $bits));
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$bitbuffer = substr($bitbuffer, 0, 0 - $bits);
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return $value;
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}
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}
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