ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
Public Member Functions
getid3_png Class Reference

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

+ Inheritance diagram for getid3_png:
+ Collaboration diagram for getid3_png:

Public Member Functions

 getid3_png (&$fd, &$ThisFileInfo)
 
 PNGsRGBintentLookup ($sRGB)
 
 PNGcompressionMethodLookup ($compressionmethod)
 
 PNGpHYsUnitLookup ($unitid)
 
 PNGoFFsUnitLookup ($unitid)
 
 PNGpCALequationTypeLookup ($equationtype)
 
 PNGsCALUnitLookup ($unitid)
 
 IHDRcalculateBitsPerSample ($color_type, $bit_depth)
 
 Analyze ()
 
 PNGsRGBintentLookup ($sRGB)
 
 PNGcompressionMethodLookup ($compressionmethod)
 
 PNGpHYsUnitLookup ($unitid)
 
 PNGoFFsUnitLookup ($unitid)
 
 PNGpCALequationTypeLookup ($equationtype)
 
 PNGsCALUnitLookup ($unitid)
 
 IHDRcalculateBitsPerSample ($color_type, $bit_depth)
 
- 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.png.php.

Member Function Documentation

◆ Analyze()

getid3_png::Analyze ( )

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

References $blue, $green, $info, $red, $text, getid3_lib\BigEndian2Int(), getid3_handler\fread(), getid3_handler\fseek(), getid3_handler\ftell(), IHDRcalculateBitsPerSample(), PNGcompressionMethodLookup(), PNGoFFsUnitLookup(), PNGpCALequationTypeLookup(), PNGpHYsUnitLookup(), PNGsCALUnitLookup(), and PNGsRGBintentLookup().

21  {
22  $info = &$this->getid3->info;
23 
24  // shortcut
25  $info['png'] = array();
26  $thisfile_png = &$info['png'];
27 
28  $info['fileformat'] = 'png';
29  $info['video']['dataformat'] = 'png';
30  $info['video']['lossless'] = false;
31 
32  $this->fseek($info['avdataoffset']);
33  $PNGfiledata = $this->fread($this->getid3->fread_buffer_size());
34  $offset = 0;
35 
36  $PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A
37  $offset += 8;
38 
39  if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
40  $info['error'][] = 'First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier';
41  unset($info['fileformat']);
42  return false;
43  }
44 
45  while ((($this->ftell() - (strlen($PNGfiledata) - $offset)) < $info['filesize'])) {
46  $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
47  $offset += 4;
48  while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && ($this->ftell() < $info['filesize'])) {
49  $PNGfiledata .= $this->fread($this->getid3->fread_buffer_size());
50  }
51  $chunk['type_text'] = substr($PNGfiledata, $offset, 4);
52  $offset += 4;
53  $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']);
54  $chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']);
55  $offset += $chunk['data_length'];
56  $chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
57  $offset += 4;
58 
59  $chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000);
60  $chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000);
61  $chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000);
62  $chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020);
63 
64  // shortcut
65  $thisfile_png[$chunk['type_text']] = array();
66  $thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']];
67 
68  switch ($chunk['type_text']) {
69 
70  case 'IHDR': // Image Header
71  $thisfile_png_chunk_type_text['header'] = $chunk;
72  $thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
73  $thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
74  $thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
75  $thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 9, 1));
76  $thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1));
77  $thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1));
78  $thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1));
79 
80  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']);
81  $thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01);
82  $thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02);
83  $thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04);
84 
85  $info['video']['resolution_x'] = $thisfile_png_chunk_type_text['width'];
86  $info['video']['resolution_y'] = $thisfile_png_chunk_type_text['height'];
87 
88  $info['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']);
89  break;
90 
91 
92  case 'PLTE': // Palette
93  $thisfile_png_chunk_type_text['header'] = $chunk;
94  $paletteoffset = 0;
95  for ($i = 0; $i <= 255; $i++) {
96  //$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
97  //$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
98  //$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
99  $red = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
100  $green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
101  $blue = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
102  $thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue));
103  }
104  break;
105 
106 
107  case 'tRNS': // Transparency
108  $thisfile_png_chunk_type_text['header'] = $chunk;
109  switch ($thisfile_png['IHDR']['raw']['color_type']) {
110  case 0:
111  $thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
112  break;
113 
114  case 2:
115  $thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
116  $thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
117  $thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2));
118  break;
119 
120  case 3:
121  for ($i = 0; $i < strlen($chunk['data']); $i++) {
122  $thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1));
123  }
124  break;
125 
126  case 4:
127  case 6:
128  $info['error'][] = 'Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
129 
130  default:
131  $info['warning'][] = 'Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
132  break;
133  }
134  break;
135 
136 
137  case 'gAMA': // Image Gamma
138  $thisfile_png_chunk_type_text['header'] = $chunk;
139  $thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000;
140  break;
141 
142 
143  case 'cHRM': // Primary Chromaticities
144  $thisfile_png_chunk_type_text['header'] = $chunk;
145  $thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000;
146  $thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000;
147  $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000;
148  $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000;
149  $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000;
150  $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000;
151  $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000;
152  $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000;
153  break;
154 
155 
156  case 'sRGB': // Standard RGB Color Space
157  $thisfile_png_chunk_type_text['header'] = $chunk;
158  $thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']);
159  $thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']);
160  break;
161 
162 
163  case 'iCCP': // Embedded ICC Profile
164  $thisfile_png_chunk_type_text['header'] = $chunk;
165  list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2);
166  $thisfile_png_chunk_type_text['profile_name'] = $profilename;
167  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1));
168  $thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1);
169 
170  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
171  break;
172 
173 
174  case 'tEXt': // Textual Data
175  $thisfile_png_chunk_type_text['header'] = $chunk;
176  list($keyword, $text) = explode("\x00", $chunk['data'], 2);
177  $thisfile_png_chunk_type_text['keyword'] = $keyword;
178  $thisfile_png_chunk_type_text['text'] = $text;
179 
180  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
181  break;
182 
183 
184  case 'zTXt': // Compressed Textual Data
185  $thisfile_png_chunk_type_text['header'] = $chunk;
186  list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
187  $thisfile_png_chunk_type_text['keyword'] = $keyword;
188  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
189  $thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1);
190  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
191  switch ($thisfile_png_chunk_type_text['compression_method']) {
192  case 0:
193  $thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']);
194  break;
195 
196  default:
197  // unknown compression method
198  break;
199  }
200 
201  if (isset($thisfile_png_chunk_type_text['text'])) {
202  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
203  }
204  break;
205 
206 
207  case 'iTXt': // International Textual Data
208  $thisfile_png_chunk_type_text['header'] = $chunk;
209  list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
210  $thisfile_png_chunk_type_text['keyword'] = $keyword;
211  $thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
212  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1));
213  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
214  list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3);
215  $thisfile_png_chunk_type_text['language_tag'] = $languagetag;
216  $thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword;
217 
218  if ($thisfile_png_chunk_type_text['compression']) {
219 
220  switch ($thisfile_png_chunk_type_text['compression_method']) {
221  case 0:
222  $thisfile_png_chunk_type_text['text'] = gzuncompress($text);
223  break;
224 
225  default:
226  // unknown compression method
227  break;
228  }
229 
230  } else {
231 
232  $thisfile_png_chunk_type_text['text'] = $text;
233 
234  }
235 
236  if (isset($thisfile_png_chunk_type_text['text'])) {
237  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
238  }
239  break;
240 
241 
242  case 'bKGD': // Background Color
243  $thisfile_png_chunk_type_text['header'] = $chunk;
244  switch ($thisfile_png['IHDR']['raw']['color_type']) {
245  case 0:
246  case 4:
247  $thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']);
248  break;
249 
250  case 2:
251  case 6:
252  $thisfile_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
253  $thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
254  $thisfile_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
255  break;
256 
257  case 3:
258  $thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']);
259  break;
260 
261  default:
262  break;
263  }
264  break;
265 
266 
267  case 'pHYs': // Physical Pixel Dimensions
268  $thisfile_png_chunk_type_text['header'] = $chunk;
269  $thisfile_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
270  $thisfile_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
271  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
272  $thisfile_png_chunk_type_text['unit'] = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
273  break;
274 
275 
276  case 'sBIT': // Significant Bits
277  $thisfile_png_chunk_type_text['header'] = $chunk;
278  switch ($thisfile_png['IHDR']['raw']['color_type']) {
279  case 0:
280  $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
281  break;
282 
283  case 2:
284  case 3:
285  $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
286  $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
287  $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
288  break;
289 
290  case 4:
291  $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
292  $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
293  break;
294 
295  case 6:
296  $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
297  $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
298  $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
299  $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1));
300  break;
301 
302  default:
303  break;
304  }
305  break;
306 
307 
308  case 'sPLT': // Suggested Palette
309  $thisfile_png_chunk_type_text['header'] = $chunk;
310  list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2);
311  $thisfile_png_chunk_type_text['palette_name'] = $palettename;
312  $sPLToffset = 0;
313  $thisfile_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1));
314  $sPLToffset += 1;
315  $thisfile_png_chunk_type_text['sample_depth_bytes'] = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8;
316  $paletteCounter = 0;
317  while ($sPLToffset < strlen($otherdata)) {
318  $thisfile_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
319  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
320  $thisfile_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
321  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
322  $thisfile_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
323  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
324  $thisfile_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
325  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
326  $thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2));
327  $sPLToffset += 2;
328  $paletteCounter++;
329  }
330  break;
331 
332 
333  case 'hIST': // Palette Histogram
334  $thisfile_png_chunk_type_text['header'] = $chunk;
335  $hISTcounter = 0;
336  while ($hISTcounter < strlen($chunk['data'])) {
337  $thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $hISTcounter / 2, 2));
338  $hISTcounter += 2;
339  }
340  break;
341 
342 
343  case 'tIME': // Image Last-Modification Time
344  $thisfile_png_chunk_type_text['header'] = $chunk;
345  $thisfile_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
346  $thisfile_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
347  $thisfile_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1));
348  $thisfile_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 1));
349  $thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 5, 1));
350  $thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 6, 1));
351  $thisfile_png_chunk_type_text['unix'] = gmmktime($thisfile_png_chunk_type_text['hour'], $thisfile_png_chunk_type_text['minute'], $thisfile_png_chunk_type_text['second'], $thisfile_png_chunk_type_text['month'], $thisfile_png_chunk_type_text['day'], $thisfile_png_chunk_type_text['year']);
352  break;
353 
354 
355  case 'oFFs': // Image Offset
356  $thisfile_png_chunk_type_text['header'] = $chunk;
357  $thisfile_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true);
358  $thisfile_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true);
359  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
360  $thisfile_png_chunk_type_text['unit'] = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
361  break;
362 
363 
364  case 'pCAL': // Calibration Of Pixel Values
365  $thisfile_png_chunk_type_text['header'] = $chunk;
366  list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2);
367  $thisfile_png_chunk_type_text['calibration_name'] = $calibrationname;
368  $pCALoffset = 0;
369  $thisfile_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true);
370  $pCALoffset += 4;
371  $thisfile_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true);
372  $pCALoffset += 4;
373  $thisfile_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1));
374  $pCALoffset += 1;
375  $thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']);
376  $thisfile_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1));
377  $pCALoffset += 1;
378  $thisfile_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], $pCALoffset));
379  break;
380 
381 
382  case 'sCAL': // Physical Scale Of Image Subject
383  $thisfile_png_chunk_type_text['header'] = $chunk;
384  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
385  $thisfile_png_chunk_type_text['unit'] = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
386  list($pixelwidth, $pixelheight) = explode("\x00", substr($chunk['data'], 1));
387  $thisfile_png_chunk_type_text['pixel_width'] = $pixelwidth;
388  $thisfile_png_chunk_type_text['pixel_height'] = $pixelheight;
389  break;
390 
391 
392  case 'gIFg': // GIF Graphic Control Extension
393  $gIFgCounter = 0;
394  if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
395  $gIFgCounter = count($thisfile_png_chunk_type_text);
396  }
397  $thisfile_png_chunk_type_text[$gIFgCounter]['header'] = $chunk;
398  $thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
399  $thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
400  $thisfile_png_chunk_type_text[$gIFgCounter]['delay_time'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
401  break;
402 
403 
404  case 'gIFx': // GIF Application Extension
405  $gIFxCounter = 0;
406  if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
407  $gIFxCounter = count($thisfile_png_chunk_type_text);
408  }
409  $thisfile_png_chunk_type_text[$gIFxCounter]['header'] = $chunk;
410  $thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($chunk['data'], 0, 8);
411  $thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code'] = substr($chunk['data'], 8, 3);
412  $thisfile_png_chunk_type_text[$gIFxCounter]['application_data'] = substr($chunk['data'], 11);
413  break;
414 
415 
416  case 'IDAT': // Image Data
417  $idatinformationfieldindex = 0;
418  if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) {
419  $idatinformationfieldindex = count($thisfile_png['IDAT']);
420  }
421  unset($chunk['data']);
422  $thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk;
423  break;
424 
425 
426  case 'IEND': // Image Trailer
427  $thisfile_png_chunk_type_text['header'] = $chunk;
428  break;
429 
430 
431  default:
432  //unset($chunk['data']);
433  $thisfile_png_chunk_type_text['header'] = $chunk;
434  $info['warning'][] = 'Unhandled chunk type: '.$chunk['type_text'];
435  break;
436  }
437  }
438 
439  return true;
440  }
$blue
$blue
Definition: example_030.php:81
getid3_png\PNGcompressionMethodLookup
PNGcompressionMethodLookup($compressionmethod)
Definition: module.graphic.png.php:450
getid3_png\PNGpHYsUnitLookup
PNGpHYsUnitLookup($unitid)
Definition: module.graphic.png.php:457
getid3_png\PNGoFFsUnitLookup
PNGoFFsUnitLookup($unitid)
Definition: module.graphic.png.php:465
getid3_png\PNGpCALequationTypeLookup
PNGpCALequationTypeLookup($equationtype)
Definition: module.graphic.png.php:473
$info
$info
Definition: example_052.php:80
$red
$red
Definition: example_030.php:80
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
$green
$green
Definition: example_030.php:83
getid3_lib\BigEndian2Int
BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:234
getid3_png\PNGsRGBintentLookup
PNGsRGBintentLookup($sRGB)
Definition: module.graphic.png.php:440
getid3_png\PNGsCALUnitLookup
PNGsCALUnitLookup($unitid)
Definition: module.graphic.png.php:483
$text
$text
Definition: example_020.php:127
getid3_png\IHDRcalculateBitsPerSample
IHDRcalculateBitsPerSample($color_type, $bit_depth)
Definition: module.graphic.png.php:491
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\ftell
ftell()
Definition: getid3.php:1678
+ Here is the call graph for this function:

◆ getid3_png()

getid3_png::getid3_png ( &  $fd,
&  $ThisFileInfo 
)

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

References $blue, $green, $red, $text, getid3_lib\BigEndian2Int(), getid3_handler\fread(), getid3_handler\fseek(), getid3_handler\ftell(), GETID3_FREAD_BUFFER_SIZE, IHDRcalculateBitsPerSample(), PNGcompressionMethodLookup(), PNGoFFsUnitLookup(), PNGpCALequationTypeLookup(), PNGpHYsUnitLookup(), PNGsCALUnitLookup(), and PNGsRGBintentLookup().

20  {
21 
22  // shortcut
23  $ThisFileInfo['png'] = array();
24  $thisfile_png = &$ThisFileInfo['png'];
25 
26  $ThisFileInfo['fileformat'] = 'png';
27  $ThisFileInfo['video']['dataformat'] = 'png';
28  $ThisFileInfo['video']['lossless'] = false;
29 
30  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
31  $PNGfiledata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
32  $offset = 0;
33 
34  $PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A
35  $offset += 8;
36 
37  if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
38  $ThisFileInfo['error'][] = 'First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier';
39  unset($ThisFileInfo['fileformat']);
40  return false;
41  }
42 
43  while (((ftell($fd) - (strlen($PNGfiledata) - $offset)) < $ThisFileInfo['filesize'])) {
44  $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
45  $offset += 4;
46  while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($fd) < $ThisFileInfo['filesize'])) {
47  $PNGfiledata .= fread($fd, GETID3_FREAD_BUFFER_SIZE);
48  }
49  $chunk['type_text'] = substr($PNGfiledata, $offset, 4);
50  $offset += 4;
51  $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']);
52  $chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']);
53  $offset += $chunk['data_length'];
54  $chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
55  $offset += 4;
56 
57  $chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000);
58  $chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000);
59  $chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000);
60  $chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020);
61 
62  // shortcut
63  $thisfile_png[$chunk['type_text']] = array();
64  $thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']];
65 
66  switch ($chunk['type_text']) {
67 
68  case 'IHDR': // Image Header
69  $thisfile_png_chunk_type_text['header'] = $chunk;
70  $thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 4));
71  $thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 4));
72  $thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 8, 1));
73  $thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 9, 1));
74  $thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 10, 1));
75  $thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 11, 1));
76  $thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 12, 1));
77 
78  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']);
79  $thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01);
80  $thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02);
81  $thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04);
82 
83  $ThisFileInfo['video']['resolution_x'] = $thisfile_png_chunk_type_text['width'];
84  $ThisFileInfo['video']['resolution_y'] = $thisfile_png_chunk_type_text['height'];
85 
86  $ThisFileInfo['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']);
87  break;
88 
89 
90  case 'PLTE': // Palette
91  $thisfile_png_chunk_type_text['header'] = $chunk;
92  $paletteoffset = 0;
93  for ($i = 0; $i <= 255; $i++) {
94  //$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
95  //$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
96  //$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
97  $red = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
98  $green = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
99  $blue = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $paletteoffset++, 1));
100  $thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue));
101  }
102  break;
103 
104 
105  case 'tRNS': // Transparency
106  $thisfile_png_chunk_type_text['header'] = $chunk;
107  switch ($thisfile_png['IHDR']['raw']['color_type']) {
108  case 0:
109  $thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 2));
110  break;
111 
112  case 2:
113  $thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 2));
114  $thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2, 2));
115  $thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 2));
116  break;
117 
118  case 3:
119  for ($i = 0; $i < strlen($thisfile_png_chunk_type_text['header']['data']); $i++) {
120  $thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $i, 1));
121  }
122  break;
123 
124  case 4:
125  case 6:
126  $ThisFileInfo['error'][] = 'Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
127 
128  default:
129  $ThisFileInfo['warning'][] = 'Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
130  break;
131  }
132  break;
133 
134 
135  case 'gAMA': // Image Gamma
136  $thisfile_png_chunk_type_text['header'] = $chunk;
137  $thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($thisfile_png_chunk_type_text['header']['data']) / 100000;
138  break;
139 
140 
141  case 'cHRM': // Primary Chromaticities
142  $thisfile_png_chunk_type_text['header'] = $chunk;
143  $thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 4)) / 100000;
144  $thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 4)) / 100000;
145  $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 8, 4)) / 100000;
146  $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 12, 4)) / 100000;
147  $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 16, 4)) / 100000;
148  $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 20, 4)) / 100000;
149  $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 24, 4)) / 100000;
150  $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 28, 4)) / 100000;
151  break;
152 
153 
154  case 'sRGB': // Standard RGB Color Space
155  $thisfile_png_chunk_type_text['header'] = $chunk;
156  $thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($thisfile_png_chunk_type_text['header']['data']);
157  $thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']);
158  break;
159 
160 
161  case 'iCCP': // Embedded ICC Profile
162  $thisfile_png_chunk_type_text['header'] = $chunk;
163  list($profilename, $compressiondata) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
164  $thisfile_png_chunk_type_text['profile_name'] = $profilename;
165  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1));
166  $thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1);
167 
168  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
169  break;
170 
171 
172  case 'tEXt': // Textual Data
173  $thisfile_png_chunk_type_text['header'] = $chunk;
174  list($keyword, $text) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
175  $thisfile_png_chunk_type_text['keyword'] = $keyword;
176  $thisfile_png_chunk_type_text['text'] = $text;
177 
178  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
179  break;
180 
181 
182  case 'zTXt': // Compressed Textual Data
183  $thisfile_png_chunk_type_text['header'] = $chunk;
184  list($keyword, $otherdata) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
185  $thisfile_png_chunk_type_text['keyword'] = $keyword;
186  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
187  $thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1);
188  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
189  switch ($thisfile_png_chunk_type_text['compression_method']) {
190  case 0:
191  $thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']);
192  break;
193 
194  default:
195  // unknown compression method
196  break;
197  }
198 
199  if (isset($thisfile_png_chunk_type_text['text'])) {
200  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
201  }
202  break;
203 
204 
205  case 'iTXt': // International Textual Data
206  $thisfile_png_chunk_type_text['header'] = $chunk;
207  list($keyword, $otherdata) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
208  $thisfile_png_chunk_type_text['keyword'] = $keyword;
209  $thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
210  $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1));
211  $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
212  list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3);
213  $thisfile_png_chunk_type_text['language_tag'] = $languagetag;
214  $thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword;
215 
216  if ($thisfile_png_chunk_type_text['compression']) {
217 
218  switch ($thisfile_png_chunk_type_text['compression_method']) {
219  case 0:
220  $thisfile_png_chunk_type_text['text'] = gzuncompress($text);
221  break;
222 
223  default:
224  // unknown compression method
225  break;
226  }
227 
228  } else {
229 
230  $thisfile_png_chunk_type_text['text'] = $text;
231 
232  }
233 
234  if (isset($thisfile_png_chunk_type_text['text'])) {
235  $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
236  }
237  break;
238 
239 
240  case 'bKGD': // Background Color
241  $thisfile_png_chunk_type_text['header'] = $chunk;
242  switch ($thisfile_png['IHDR']['raw']['color_type']) {
243  case 0:
244  case 4:
245  $thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($thisfile_png_chunk_type_text['header']['data']);
246  break;
247 
248  case 2:
249  case 6:
250  $thisfile_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
251  $thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
252  $thisfile_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
253  break;
254 
255  case 3:
256  $thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($thisfile_png_chunk_type_text['header']['data']);
257  break;
258 
259  default:
260  break;
261  }
262  break;
263 
264 
265  case 'pHYs': // Physical Pixel Dimensions
266  $thisfile_png_chunk_type_text['header'] = $chunk;
267  $thisfile_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 4));
268  $thisfile_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 4));
269  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 8, 1));
270  $thisfile_png_chunk_type_text['unit'] = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
271  break;
272 
273 
274  case 'sBIT': // Significant Bits
275  $thisfile_png_chunk_type_text['header'] = $chunk;
276  switch ($thisfile_png['IHDR']['raw']['color_type']) {
277  case 0:
278  $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
279  break;
280 
281  case 2:
282  case 3:
283  $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
284  $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 1, 1));
285  $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2, 1));
286  break;
287 
288  case 4:
289  $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
290  $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 1, 1));
291  break;
292 
293  case 6:
294  $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
295  $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 1, 1));
296  $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2, 1));
297  $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 3, 1));
298  break;
299 
300  default:
301  break;
302  }
303  break;
304 
305 
306  case 'sPLT': // Suggested Palette
307  $thisfile_png_chunk_type_text['header'] = $chunk;
308  list($palettename, $otherdata) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
309  $thisfile_png_chunk_type_text['palette_name'] = $palettename;
310  $sPLToffset = 0;
311  $thisfile_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1));
312  $sPLToffset += 1;
313  $thisfile_png_chunk_type_text['sample_depth_bytes'] = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8;
314  $paletteCounter = 0;
315  while ($sPLToffset < strlen($otherdata)) {
316  $thisfile_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
317  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
318  $thisfile_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
319  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
320  $thisfile_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
321  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
322  $thisfile_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
323  $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
324  $thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2));
325  $sPLToffset += 2;
326  $paletteCounter++;
327  }
328  break;
329 
330 
331  case 'hIST': // Palette Histogram
332  $thisfile_png_chunk_type_text['header'] = $chunk;
333  $hISTcounter = 0;
334  while ($hISTcounter < strlen($thisfile_png_chunk_type_text['header']['data'])) {
335  $thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $hISTcounter / 2, 2));
336  $hISTcounter += 2;
337  }
338  break;
339 
340 
341  case 'tIME': // Image Last-Modification Time
342  $thisfile_png_chunk_type_text['header'] = $chunk;
343  $thisfile_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 2));
344  $thisfile_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2, 1));
345  $thisfile_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 3, 1));
346  $thisfile_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 1));
347  $thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 5, 1));
348  $thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 6, 1));
349  $thisfile_png_chunk_type_text['unix'] = gmmktime($thisfile_png_chunk_type_text['hour'], $thisfile_png_chunk_type_text['minute'], $thisfile_png_chunk_type_text['second'], $thisfile_png_chunk_type_text['month'], $thisfile_png_chunk_type_text['day'], $thisfile_png_chunk_type_text['year']);
350  break;
351 
352 
353  case 'oFFs': // Image Offset
354  $thisfile_png_chunk_type_text['header'] = $chunk;
355  $thisfile_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 4), false, true);
356  $thisfile_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 4, 4), false, true);
357  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 8, 1));
358  $thisfile_png_chunk_type_text['unit'] = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
359  break;
360 
361 
362  case 'pCAL': // Calibration Of Pixel Values
363  $thisfile_png_chunk_type_text['header'] = $chunk;
364  list($calibrationname, $otherdata) = explode("\x00", $thisfile_png_chunk_type_text['header']['data'], 2);
365  $thisfile_png_chunk_type_text['calibration_name'] = $calibrationname;
366  $pCALoffset = 0;
367  $thisfile_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $pCALoffset, 4), false, true);
368  $pCALoffset += 4;
369  $thisfile_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $pCALoffset, 4), false, true);
370  $pCALoffset += 4;
371  $thisfile_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $pCALoffset, 1));
372  $pCALoffset += 1;
373  $thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']);
374  $thisfile_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], $pCALoffset, 1));
375  $pCALoffset += 1;
376  $thisfile_png_chunk_type_text['parameters'] = explode("\x00", substr($thisfile_png_chunk_type_text['header']['data'], $pCALoffset));
377  break;
378 
379 
380  case 'sCAL': // Physical Scale Of Image Subject
381  $thisfile_png_chunk_type_text['header'] = $chunk;
382  $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
383  $thisfile_png_chunk_type_text['unit'] = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
384  list($pixelwidth, $pixelheight) = explode("\x00", substr($thisfile_png_chunk_type_text['header']['data'], 1));
385  $thisfile_png_chunk_type_text['pixel_width'] = $pixelwidth;
386  $thisfile_png_chunk_type_text['pixel_height'] = $pixelheight;
387  break;
388 
389 
390  case 'gIFg': // GIF Graphic Control Extension
391  $gIFgCounter = 0;
392  if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
393  $gIFgCounter = count($thisfile_png_chunk_type_text);
394  }
395  $thisfile_png_chunk_type_text[$gIFgCounter]['header'] = $chunk;
396  $thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 0, 1));
397  $thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 1, 1));
398  $thisfile_png_chunk_type_text[$gIFgCounter]['delay_time'] = getid3_lib::BigEndian2Int(substr($thisfile_png_chunk_type_text['header']['data'], 2, 2));
399  break;
400 
401 
402  case 'gIFx': // GIF Application Extension
403  $gIFxCounter = 0;
404  if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
405  $gIFxCounter = count($thisfile_png_chunk_type_text);
406  }
407  $thisfile_png_chunk_type_text[$gIFxCounter]['header'] = $chunk;
408  $thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($thisfile_png_chunk_type_text['header']['data'], 0, 8);
409  $thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code'] = substr($thisfile_png_chunk_type_text['header']['data'], 8, 3);
410  $thisfile_png_chunk_type_text[$gIFxCounter]['application_data'] = substr($thisfile_png_chunk_type_text['header']['data'], 11);
411  break;
412 
413 
414  case 'IDAT': // Image Data
415  $idatinformationfieldindex = 0;
416  if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) {
417  $idatinformationfieldindex = count($thisfile_png['IDAT']);
418  }
419  unset($chunk['data']);
420  $thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk;
421  break;
422 
423 
424  case 'IEND': // Image Trailer
425  $thisfile_png_chunk_type_text['header'] = $chunk;
426  break;
427 
428 
429  default:
430  //unset($chunk['data']);
431  $thisfile_png_chunk_type_text['header'] = $chunk;
432  $ThisFileInfo['warning'][] = 'Unhandled chunk type: '.$chunk['type_text'];
433  break;
434  }
435  }
436 
437  return true;
438  }
GETID3_FREAD_BUFFER_SIZE
const GETID3_FREAD_BUFFER_SIZE
Definition: getid3.php:14
$blue
$blue
Definition: example_030.php:81
getid3_png\PNGcompressionMethodLookup
PNGcompressionMethodLookup($compressionmethod)
Definition: module.graphic.png.php:450
getid3_png\PNGpHYsUnitLookup
PNGpHYsUnitLookup($unitid)
Definition: module.graphic.png.php:457
getid3_png\PNGoFFsUnitLookup
PNGoFFsUnitLookup($unitid)
Definition: module.graphic.png.php:465
getid3_png\PNGpCALequationTypeLookup
PNGpCALequationTypeLookup($equationtype)
Definition: module.graphic.png.php:473
$red
$red
Definition: example_030.php:80
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
$green
$green
Definition: example_030.php:83
getid3_lib\BigEndian2Int
BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:234
getid3_png\PNGsRGBintentLookup
PNGsRGBintentLookup($sRGB)
Definition: module.graphic.png.php:440
getid3_png\PNGsCALUnitLookup
PNGsCALUnitLookup($unitid)
Definition: module.graphic.png.php:483
$text
$text
Definition: example_020.php:127
getid3_png\IHDRcalculateBitsPerSample
IHDRcalculateBitsPerSample($color_type, $bit_depth)
Definition: module.graphic.png.php:491
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\ftell
ftell()
Definition: getid3.php:1678
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◆ IHDRcalculateBitsPerSample() [1/2]

getid3_png::IHDRcalculateBitsPerSample (   $color_type,
  $bit_depth 
)

Definition at line 491 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

491  {
492  switch ($color_type) {
493  case 0: // Each pixel is a grayscale sample.
494  return $bit_depth;
495  break;
496 
497  case 2: // Each pixel is an R,G,B triple
498  return 3 * $bit_depth;
499  break;
500 
501  case 3: // Each pixel is a palette index; a PLTE chunk must appear.
502  return $bit_depth;
503  break;
504 
505  case 4: // Each pixel is a grayscale sample, followed by an alpha sample.
506  return 2 * $bit_depth;
507  break;
508 
509  case 6: // Each pixel is an R,G,B triple, followed by an alpha sample.
510  return 4 * $bit_depth;
511  break;
512  }
513  return false;
514  }
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◆ IHDRcalculateBitsPerSample() [2/2]

getid3_png::IHDRcalculateBitsPerSample (   $color_type,
  $bit_depth 
)

Definition at line 493 of file module.graphic.png.php.

493  {
494  switch ($color_type) {
495  case 0: // Each pixel is a grayscale sample.
496  return $bit_depth;
497  break;
498 
499  case 2: // Each pixel is an R,G,B triple
500  return 3 * $bit_depth;
501  break;
502 
503  case 3: // Each pixel is a palette index; a PLTE chunk must appear.
504  return $bit_depth;
505  break;
506 
507  case 4: // Each pixel is a grayscale sample, followed by an alpha sample.
508  return 2 * $bit_depth;
509  break;
510 
511  case 6: // Each pixel is an R,G,B triple, followed by an alpha sample.
512  return 4 * $bit_depth;
513  break;
514  }
515  return false;
516  }

◆ PNGcompressionMethodLookup() [1/2]

getid3_png::PNGcompressionMethodLookup (   $compressionmethod)

Definition at line 450 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

450  {
451  static $PNGcompressionMethodLookup = array(
452  0 => 'deflate/inflate'
453  );
454  return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid');
455  }
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◆ PNGcompressionMethodLookup() [2/2]

getid3_png::PNGcompressionMethodLookup (   $compressionmethod)

Definition at line 452 of file module.graphic.png.php.

452  {
453  static $PNGcompressionMethodLookup = array(
454  0 => 'deflate/inflate'
455  );
456  return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid');
457  }

◆ PNGoFFsUnitLookup() [1/2]

getid3_png::PNGoFFsUnitLookup (   $unitid)

Definition at line 465 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

465  {
466  static $PNGoFFsUnitLookup = array(
467  0 => 'pixel',
468  1 => 'micrometer'
469  );
470  return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid');
471  }
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◆ PNGoFFsUnitLookup() [2/2]

getid3_png::PNGoFFsUnitLookup (   $unitid)

Definition at line 467 of file module.graphic.png.php.

467  {
468  static $PNGoFFsUnitLookup = array(
469  0 => 'pixel',
470  1 => 'micrometer'
471  );
472  return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid');
473  }

◆ PNGpCALequationTypeLookup() [1/2]

getid3_png::PNGpCALequationTypeLookup (   $equationtype)

Definition at line 473 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

473  {
474  static $PNGpCALequationTypeLookup = array(
475  0 => 'Linear mapping',
476  1 => 'Base-e exponential mapping',
477  2 => 'Arbitrary-base exponential mapping',
478  3 => 'Hyperbolic mapping'
479  );
480  return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid');
481  }
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◆ PNGpCALequationTypeLookup() [2/2]

getid3_png::PNGpCALequationTypeLookup (   $equationtype)

Definition at line 475 of file module.graphic.png.php.

475  {
476  static $PNGpCALequationTypeLookup = array(
477  0 => 'Linear mapping',
478  1 => 'Base-e exponential mapping',
479  2 => 'Arbitrary-base exponential mapping',
480  3 => 'Hyperbolic mapping'
481  );
482  return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid');
483  }

◆ PNGpHYsUnitLookup() [1/2]

getid3_png::PNGpHYsUnitLookup (   $unitid)

Definition at line 457 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

457  {
458  static $PNGpHYsUnitLookup = array(
459  0 => 'unknown',
460  1 => 'meter'
461  );
462  return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid');
463  }
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◆ PNGpHYsUnitLookup() [2/2]

getid3_png::PNGpHYsUnitLookup (   $unitid)

Definition at line 459 of file module.graphic.png.php.

459  {
460  static $PNGpHYsUnitLookup = array(
461  0 => 'unknown',
462  1 => 'meter'
463  );
464  return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid');
465  }

◆ PNGsCALUnitLookup() [1/2]

getid3_png::PNGsCALUnitLookup (   $unitid)

Definition at line 483 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

483  {
484  static $PNGsCALUnitLookup = array(
485  0 => 'meter',
486  1 => 'radian'
487  );
488  return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid');
489  }
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◆ PNGsCALUnitLookup() [2/2]

getid3_png::PNGsCALUnitLookup (   $unitid)

Definition at line 485 of file module.graphic.png.php.

485  {
486  static $PNGsCALUnitLookup = array(
487  0 => 'meter',
488  1 => 'radian'
489  );
490  return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid');
491  }

◆ PNGsRGBintentLookup() [1/2]

getid3_png::PNGsRGBintentLookup (   $sRGB)

Definition at line 440 of file module.graphic.png.php.

Referenced by Analyze(), and getid3_png().

440  {
441  static $PNGsRGBintentLookup = array(
442  0 => 'Perceptual',
443  1 => 'Relative colorimetric',
444  2 => 'Saturation',
445  3 => 'Absolute colorimetric'
446  );
447  return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid');
448  }
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◆ PNGsRGBintentLookup() [2/2]

getid3_png::PNGsRGBintentLookup (   $sRGB)

Definition at line 442 of file module.graphic.png.php.

442  {
443  static $PNGsRGBintentLookup = array(
444  0 => 'Perceptual',
445  1 => 'Relative colorimetric',
446  2 => 'Saturation',
447  3 => 'Absolute colorimetric'
448  );
449  return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid');
450  }
The documentation for this class was generated from the following file: