getid3_gif::GetLSBits() - Code Metrics - Inspection of "getID3 version 1.9.19" - owncloud/music - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — vendor/getid3 ( 69b815...49c253 )

by Pauli

created 2020-01-26 22:17 UTC

getid3_gif::GetLSBits() A

↳ Parent: getid3_gif

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
nc	2
nop	1
dl	0
loc	10
rs	9.9332
c	0
b	0
f	0

<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[email protected]>               //
//  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
 */
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);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}

					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;
	}

}


1		<?php
2
3		/////////////////////////////////////////////////////////////////
4		/// getID3() by James Heinrich <[email protected]> //
5		// available at https://github.com/JamesHeinrich/getID3 //
6		// or https://www.getid3.org //
7		// or http://getid3.sourceforge.net //
8		// see readme.txt for more details //
9		/////////////////////////////////////////////////////////////////
10		// //
11		// module.graphic.gif.php //
12		// module for analyzing GIF Image files //
13		// dependencies: NONE //
14		// ///
15		/////////////////////////////////////////////////////////////////
16
17		/**
18		* @link https://www.w3.org/Graphics/GIF/spec-gif89a.txt
19		* @link http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
20		*/
21		class getid3_gif extends getid3_handler
22		{
23		/**
24		* @return bool
25		*/
26		public function Analyze() {
27		$info = &$this->getid3->info;
28
29		$info['fileformat'] = 'gif';
30		$info['video']['dataformat'] = 'gif';
31		$info['video']['lossless'] = true;
32		$info['video']['pixel_aspect_ratio'] = (float) 1;
33
34		$this->fseek($info['avdataoffset']);
35		$GIFheader = $this->fread(13);
36		$offset = 0;
37
38		$info['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3);
39		$offset += 3;
40
41		$magic = 'GIF';
42	View Code Duplication	if ($info['gif']['header']['raw']['identifier'] != $magic) {
		0 ignored issues – show Duplication introduced 2017-04-09 16:40 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
43		$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"');
44		unset($info['fileformat']);
45		unset($info['gif']);
46		return false;
47		}
48
49		//if (!$this->getid3->option_extra_info) {
50		// $this->warning('GIF Extensions and Global Color Table not returned due to !getid3->option_extra_info');
51		//}
52
53		$info['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3);
54		$offset += 3;
55		$info['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
56		$offset += 2;
57		$info['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
58		$offset += 2;
59		$info['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
60		$offset += 1;
61		$info['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
62		$offset += 1;
63		$info['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
64		$offset += 1;
65
66		$info['video']['resolution_x'] = $info['gif']['header']['raw']['width'];
67		$info['video']['resolution_y'] = $info['gif']['header']['raw']['height'];
68		$info['gif']['version'] = $info['gif']['header']['raw']['version'];
69		$info['gif']['header']['flags']['global_color_table'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x80);
70		if ($info['gif']['header']['raw']['flags'] & 0x80) {
71		// Number of bits per primary color available to the original image, minus 1
72		$info['gif']['header']['bits_per_pixel'] = 3 * ((($info['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
73		} else {
74		$info['gif']['header']['bits_per_pixel'] = 0;
75		}
76		$info['gif']['header']['flags']['global_color_sorted'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x40);
77		if ($info['gif']['header']['flags']['global_color_table']) {
78		// the number of bytes contained in the Global Color Table. To determine that
79		// actual size of the color table, raise 2 to [the value of the field + 1]
80		$info['gif']['header']['global_color_size'] = pow(2, ($info['gif']['header']['raw']['flags'] & 0x07) + 1);
81		$info['video']['bits_per_sample'] = ($info['gif']['header']['raw']['flags'] & 0x07) + 1;
82		} else {
83		$info['gif']['header']['global_color_size'] = 0;
84		}
85		if ($info['gif']['header']['raw']['aspect_ratio'] != 0) {
86		// Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
87		$info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
88		}
89
90		if ($info['gif']['header']['flags']['global_color_table']) {
91		$GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
92		if ($this->getid3->option_extra_info) {
93		$offset = 0;
94		for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
95		$red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
96		$green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
97		$blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
98		$info['gif']['global_color_table'][$i] = (($red << 16) \| ($green << 8) \| ($blue));
99		$info['gif']['global_color_table_rgb'][$i] = sprintf('%02X%02X%02X', $red, $green, $blue);
100		}
101		}
102		}
103
104		// Image Descriptor
105		$info['gif']['animation']['animated'] = false;
106		while (!feof($this->getid3->fp)) {
107		$NextBlockTest = $this->fread(1);
108		switch ($NextBlockTest) {
109
110		/*
111		case ',': // ',' - Image separator character
112		$ImageDescriptorData = $NextBlockTest.$this->fread(9);
113		$ImageDescriptor = array();
114		$ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
115		$ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
116		$ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
117		$ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
118		$ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
119		$ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
120		$ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
121		$info['gif']['image_descriptor'][] = $ImageDescriptor;
122
123		if ($ImageDescriptor['flags']['use_local_color_map']) {
124
125		$this->warning('This version of getID3() cannot parse local color maps for GIFs');
126		return true;
127
128		}
129		$RasterData = array();
130		$RasterData['code_size'] = getid3_lib::LittleEndian2Int($this->fread(1));
131		$RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
132		$info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
133
134		$CurrentCodeSize = $RasterData['code_size'] + 1;
135		for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
136		$DefaultDataLookupTable[$i] = chr($i);
137		}
138		$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
139		$DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
140
141		$NextValue = $this->GetLSBits($CurrentCodeSize);
142		echo 'Clear Code: '.$NextValue.'<BR>';
143
144		$NextValue = $this->GetLSBits($CurrentCodeSize);
145		echo 'First Color: '.$NextValue.'<BR>';
146
147		$Prefix = $NextValue;
148		$i = 0;
149		while ($i++ < 20) {
150		$NextValue = $this->GetLSBits($CurrentCodeSize);
151		echo $NextValue.'<br>';
152		}
153		echo 'escaping<br>';
154		return true;
155		break;
156		*/
157
158		case '!':
159		// GIF Extension Block
160		$ExtensionBlockData = $NextBlockTest.$this->fread(2);
161		$ExtensionBlock = array();
162		$ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
163		$ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
164		$ExtensionBlock['data'] = (($ExtensionBlock['byte_length'] > 0) ? $this->fread($ExtensionBlock['byte_length']) : null);
		0 ignored issues – show Bug introduced 2018-12-07 21:46 UTC by Report Bug Copy Issue Report It seems like `$ExtensionBlock['byte_length']` can also be of type `double` or `false`; however, `getid3_handler::fread()` does only seem to accept `integer`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
165
166		if (substr($ExtensionBlock['data'], 0, 11) == 'NETSCAPE2.0') { // Netscape Application Block (NAB)
167		$ExtensionBlock['data'] .= $this->fread(4);
168		if (substr($ExtensionBlock['data'], 11, 2) == "\x03\x01") {
169		$info['gif']['animation']['animated'] = true;
170		$info['gif']['animation']['loop_count'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlock['data'], 13, 2));
171		} else {
172		$this->warning('Expecting 03 01 at offset '.($this->ftell() - 4).', found "'.getid3_lib::PrintHexBytes(substr($ExtensionBlock['data'], 11, 2)).'"');
173		}
174		}
175
176		if ($this->getid3->option_extra_info) {
177		$info['gif']['extension_blocks'][] = $ExtensionBlock;
178		}
179		break;
180
181		case ';':
182		$info['gif']['terminator_offset'] = $this->ftell() - 1;
183		// GIF Terminator
184		break;
185
186		default:
187		break;
188
189
190		}
191		}
192
193		return true;
194		}
195
196		/**
197		* @param int $bits
198		*
199		* @return float\|int
200		*/
201		public function GetLSBits($bits) {
202		static $bitbuffer = '';
203		while (strlen($bitbuffer) < $bits) {
204		$bitbuffer = str_pad(decbin(ord($this->fread(1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
205		}
206		$value = bindec(substr($bitbuffer, 0 - $bits));
207		$bitbuffer = substr($bitbuffer, 0, 0 - $bits);
208
209		return $value;
210		}
211
212		}
213

owncloud / music

Push — vendor/getid3 ( 69b815...49c253 )

getid3_gif::GetLSBits() A

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like