ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
Public Member Functions
getid3_gif Class Reference

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g // More...

+ Inheritance diagram for getid3_gif:
+ Collaboration diagram for getid3_gif:

Public Member Functions

 getid3_gif (&$fd, &$ThisFileInfo)
 
 GetLSBits ($fd, $bits)
 
 Analyze ()
 
 GetLSBits ($bits)
 
- Public Member Functions inherited from getid3_handler
 __construct (getID3 $getid3, $call_module=null)
 
 Analyze ()
 
 AnalyzeString ($string)
 
 setStringMode ($string)
 
 saveAttachment ($name, $offset, $length, $image_mime=null)
 

Additional Inherited Members

- Protected Member Functions inherited from getid3_handler
 ftell ()
 
 fread ($bytes)
 
 fseek ($bytes, $whence=SEEK_SET)
 
 feof ()
 
 isDependencyFor ($module)
 
 error ($text)
 
 warning ($text)
 
 notice ($text)
 
- Protected Attributes inherited from getid3_handler
 $getid3
 
 $data_string_flag = false
 
 $data_string = ''
 
 $data_string_position = 0
 
 $data_string_length = 0
 

Detailed Description

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //

Definition at line 17 of file module.graphic.gif.php.

Member Function Documentation

◆ Analyze()

getid3_gif::Analyze ( )

Definition at line 21 of file module.graphic.gif.php.

References $info, getid3_handler\fread(), getid3_handler\fseek(), getid3_lib\LittleEndian2Int(), and getid3_lib\PrintHexBytes().

21  {
22  $info = &$this->getid3->info;
23 
24  $info['fileformat'] = 'gif';
25  $info['video']['dataformat'] = 'gif';
26  $info['video']['lossless'] = true;
27  $info['video']['pixel_aspect_ratio'] = (float) 1;
28 
29  $this->fseek($info['avdataoffset']);
30  $GIFheader = $this->fread(13);
31  $offset = 0;
32 
33  $info['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3);
34  $offset += 3;
35 
36  $magic = 'GIF';
37  if ($info['gif']['header']['raw']['identifier'] != $magic) {
38  $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"';
39  unset($info['fileformat']);
40  unset($info['gif']);
41  return false;
42  }
43 
44  $info['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3);
45  $offset += 3;
46  $info['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
47  $offset += 2;
48  $info['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
49  $offset += 2;
50  $info['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
51  $offset += 1;
52  $info['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
53  $offset += 1;
54  $info['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
55  $offset += 1;
56 
57  $info['video']['resolution_x'] = $info['gif']['header']['raw']['width'];
58  $info['video']['resolution_y'] = $info['gif']['header']['raw']['height'];
59  $info['gif']['version'] = $info['gif']['header']['raw']['version'];
60  $info['gif']['header']['flags']['global_color_table'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x80);
61  if ($info['gif']['header']['raw']['flags'] & 0x80) {
62  // Number of bits per primary color available to the original image, minus 1
63  $info['gif']['header']['bits_per_pixel'] = 3 * ((($info['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
64  } else {
65  $info['gif']['header']['bits_per_pixel'] = 0;
66  }
67  $info['gif']['header']['flags']['global_color_sorted'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x40);
68  if ($info['gif']['header']['flags']['global_color_table']) {
69  // the number of bytes contained in the Global Color Table. To determine that
70  // actual size of the color table, raise 2 to [the value of the field + 1]
71  $info['gif']['header']['global_color_size'] = pow(2, ($info['gif']['header']['raw']['flags'] & 0x07) + 1);
72  $info['video']['bits_per_sample'] = ($info['gif']['header']['raw']['flags'] & 0x07) + 1;
73  } else {
74  $info['gif']['header']['global_color_size'] = 0;
75  }
76  if ($info['gif']['header']['raw']['aspect_ratio'] != 0) {
77  // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
78  $info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
79  }
80 
81 // if ($info['gif']['header']['flags']['global_color_table']) {
82 // $GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
83 // $offset = 0;
84 // for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
85 // $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
86 // $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
87 // $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
88 // $info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
89 // }
90 // }
91 //
92 // // Image Descriptor
93 // while (!feof($this->getid3->fp)) {
94 // $NextBlockTest = $this->fread(1);
95 // switch ($NextBlockTest) {
96 //
97 // case ',': // ',' - Image separator character
98 //
99 // $ImageDescriptorData = $NextBlockTest.$this->fread(9);
100 // $ImageDescriptor = array();
101 // $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
102 // $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
103 // $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
104 // $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
105 // $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
106 // $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
107 // $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
108 // $info['gif']['image_descriptor'][] = $ImageDescriptor;
109 //
110 // if ($ImageDescriptor['flags']['use_local_color_map']) {
111 //
112 // $info['warning'][] = 'This version of getID3() cannot parse local color maps for GIFs';
113 // return true;
114 //
115 // }
116 //echo 'Start of raster data: '.$this->ftell().'<BR>';
117 // $RasterData = array();
118 // $RasterData['code_size'] = getid3_lib::LittleEndian2Int($this->fread(1));
119 // $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
120 // $info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
121 //
122 // $CurrentCodeSize = $RasterData['code_size'] + 1;
123 // for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
124 // $DefaultDataLookupTable[$i] = chr($i);
125 // }
126 // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
127 // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
128 //
129 //
130 // $NextValue = $this->GetLSBits($CurrentCodeSize);
131 // echo 'Clear Code: '.$NextValue.'<BR>';
132 //
133 // $NextValue = $this->GetLSBits($CurrentCodeSize);
134 // echo 'First Color: '.$NextValue.'<BR>';
135 //
136 // $Prefix = $NextValue;
137 //$i = 0;
138 // while ($i++ < 20) {
139 // $NextValue = $this->GetLSBits($CurrentCodeSize);
140 // echo $NextValue.'<BR>';
141 // }
142 //return true;
143 // break;
144 //
145 // case '!':
146 // // GIF Extension Block
147 // $ExtensionBlockData = $NextBlockTest.$this->fread(2);
148 // $ExtensionBlock = array();
149 // $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
150 // $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
151 // $ExtensionBlock['data'] = $this->fread($ExtensionBlock['byte_length']);
152 // $info['gif']['extension_blocks'][] = $ExtensionBlock;
153 // break;
154 //
155 // case ';':
156 // $info['gif']['terminator_offset'] = $this->ftell() - 1;
157 // // GIF Terminator
158 // break;
159 //
160 // default:
161 // break;
162 //
163 //
164 // }
165 // }
166 
167  return true;
168  }
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
$info
$info
Definition: example_052.php:80
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_lib\PrintHexBytes
PrintHexBytes($string, $hex=true, $spaces=true, $htmlsafe=true)
Definition: getid3.lib.php:17
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◆ getid3_gif()

getid3_gif::getid3_gif ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 20 of file module.graphic.gif.php.

References getid3_handler\fread(), getid3_handler\fseek(), and getid3_lib\LittleEndian2Int().

20  {
21  $ThisFileInfo['fileformat'] = 'gif';
22  $ThisFileInfo['video']['dataformat'] = 'gif';
23  $ThisFileInfo['video']['lossless'] = true;
24  $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
25 
26  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
27  $GIFheader = fread($fd, 13);
28  $offset = 0;
29 
30  $ThisFileInfo['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3);
31  $offset += 3;
32 
33  if ($ThisFileInfo['gif']['header']['raw']['identifier'] != 'GIF') {
34  $ThisFileInfo['error'][] = 'Expecting "GIF" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['gif']['header']['raw']['identifier'].'"';
35  unset($ThisFileInfo['fileformat']);
36  unset($ThisFileInfo['gif']);
37  return false;
38  }
39 
40  $ThisFileInfo['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3);
41  $offset += 3;
42  $ThisFileInfo['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
43  $offset += 2;
44  $ThisFileInfo['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
45  $offset += 2;
46  $ThisFileInfo['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
47  $offset += 1;
48  $ThisFileInfo['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
49  $offset += 1;
50  $ThisFileInfo['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
51  $offset += 1;
52 
53  $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['gif']['header']['raw']['width'];
54  $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['gif']['header']['raw']['height'];
55  $ThisFileInfo['gif']['version'] = $ThisFileInfo['gif']['header']['raw']['version'];
56  $ThisFileInfo['gif']['header']['flags']['global_color_table'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80);
57  if ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80) {
58  // Number of bits per primary color available to the original image, minus 1
59  $ThisFileInfo['gif']['header']['bits_per_pixel'] = 3 * ((($ThisFileInfo['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
60  } else {
61  $ThisFileInfo['gif']['header']['bits_per_pixel'] = 0;
62  }
63  $ThisFileInfo['gif']['header']['flags']['global_color_sorted'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x40);
64  if ($ThisFileInfo['gif']['header']['flags']['global_color_table']) {
65  // the number of bytes contained in the Global Color Table. To determine that
66  // actual size of the color table, raise 2 to [the value of the field + 1]
67  $ThisFileInfo['gif']['header']['global_color_size'] = pow(2, ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1);
68  $ThisFileInfo['video']['bits_per_sample'] = ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1;
69  } else {
70  $ThisFileInfo['gif']['header']['global_color_size'] = 0;
71  }
72  if ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] != 0) {
73  // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
74  $ThisFileInfo['gif']['header']['aspect_ratio'] = ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
75  }
76 
77 // if ($ThisFileInfo['gif']['header']['flags']['global_color_table']) {
78 // $GIFcolorTable = fread($fd, 3 * $ThisFileInfo['gif']['header']['global_color_size']);
79 // $offset = 0;
80 // for ($i = 0; $i < $ThisFileInfo['gif']['header']['global_color_size']; $i++) {
81 // $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
82 // $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
83 // $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
84 // $ThisFileInfo['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
85 // }
86 // }
87 //
88 // // Image Descriptor
89 // while (!feof($fd)) {
90 // $NextBlockTest = fread($fd, 1);
91 // switch ($NextBlockTest) {
92 //
93 // case ',': // ',' - Image separator character
94 //
95 // $ImageDescriptorData = $NextBlockTest.fread($fd, 9);
96 // $ImageDescriptor = array();
97 // $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
98 // $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
99 // $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
100 // $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
101 // $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
102 // $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
103 // $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
104 // $ThisFileInfo['gif']['image_descriptor'][] = $ImageDescriptor;
105 //
106 // if ($ImageDescriptor['flags']['use_local_color_map']) {
107 //
108 // $ThisFileInfo['warning'][] = 'This version of getID3() cannot parse local color maps for GIFs';
109 // return true;
110 //
111 // }
112 //echo 'Start of raster data: '.ftell($fd).'<BR>';
113 // $RasterData = array();
114 // $RasterData['code_size'] = getid3_lib::LittleEndian2Int(fread($fd, 1));
115 // $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int(fread($fd, 1));
116 // $ThisFileInfo['gif']['raster_data'][count($ThisFileInfo['gif']['image_descriptor']) - 1] = $RasterData;
117 //
118 // $CurrentCodeSize = $RasterData['code_size'] + 1;
119 // for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
120 // $DefaultDataLookupTable[$i] = chr($i);
121 // }
122 // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
123 // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
124 //
125 //
126 // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
127 // echo 'Clear Code: '.$NextValue.'<BR>';
128 //
129 // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
130 // echo 'First Color: '.$NextValue.'<BR>';
131 //
132 // $Prefix = $NextValue;
133 //$i = 0;
134 // while ($i++ < 20) {
135 // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
136 // echo $NextValue.'<BR>';
137 // }
138 //return true;
139 // break;
140 //
141 // case '!':
142 // // GIF Extension Block
143 // $ExtensionBlockData = $NextBlockTest.fread($fd, 2);
144 // $ExtensionBlock = array();
145 // $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
146 // $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
147 // $ExtensionBlock['data'] = fread($fd, $ExtensionBlock['byte_length']);
148 // $ThisFileInfo['gif']['extension_blocks'][] = $ExtensionBlock;
149 // break;
150 //
151 // case ';':
152 // $ThisFileInfo['gif']['terminator_offset'] = ftell($fd) - 1;
153 // // GIF Terminator
154 // break;
155 //
156 // default:
157 // break;
158 //
159 //
160 // }
161 // }
162 
163  return true;
164  }
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
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◆ GetLSBits() [1/2]

getid3_gif::GetLSBits (   $fd,
  $bits 
)

Definition at line 167 of file module.graphic.gif.php.

References getid3_handler\fread().

167  {
168  static $bitbuffer = '';
169  while (strlen($bitbuffer) < $bits) {
170 //echo 'Read another byte: '.ftell($fd).'<BR>';
171  $bitbuffer = str_pad(decbin(ord(fread($fd, 1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
172  }
173 
174  $value = bindec(substr($bitbuffer, 0 - $bits));
175  $bitbuffer = substr($bitbuffer, 0, 0 - $bits);
176 
177  return $value;
178  }
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
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◆ GetLSBits() [2/2]

getid3_gif::GetLSBits (   $bits)

Definition at line 171 of file module.graphic.gif.php.

References getid3_handler\fread().

171  {
172  static $bitbuffer = '';
173  while (strlen($bitbuffer) < $bits) {
174  $bitbuffer = str_pad(decbin(ord($this->fread(1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
175  }
176  $value = bindec(substr($bitbuffer, 0 - $bits));
177  $bitbuffer = substr($bitbuffer, 0, 0 - $bits);
178 
179  return $value;
180  }
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
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The documentation for this class was generated from the following file: