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sintonia/livesupport/modules/getid3/var/getid3.png.php

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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <getid3@users.sourceforge.net> //
// available at http://getid3.sourceforge.net ///
/////////////////////////////////////////////////////////////////
// //
// getid3.png.php - part of getID3() //
// See getid3.readme.txt for more details //
// //
/////////////////////////////////////////////////////////////////
function getPNGHeaderFilepointer(&$fd, &$ThisFileInfo) {
$ThisFileInfo['fileformat'] = 'png';
$ThisFileInfo['video']['dataformat'] = 'png';
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$PNGfiledata = fread($fd, FREAD_BUFFER_SIZE);
$offset = 0;
$PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A
$offset += 8;
if ($PNGidentifier != chr(0x89).chr(0x50).chr(0x4E).chr(0x47).chr(0x0D).chr(0x0A).chr(0x1A).chr(0x0A)) {
$ThisFileInfo['error'] .= "\n".'First 8 bytes of file ('.PrintHexBytes($PNGidentifier).') did not match expected PNG identifier';
unset($ThisFileInfo['fileformat']);
return false;
}
while (((ftell($fd) - (strlen($PNGfiledata) - $offset)) < $ThisFileInfo['filesize'])) {
$chunk['data_length'] = BigEndian2Int(substr($PNGfiledata, $offset, 4));
$offset += 4;
while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($fd) < $ThisFileInfo['filesize'])) {
$PNGfiledata .= fread($fd, FREAD_BUFFER_SIZE);
}
$chunk['type_text'] = substr($PNGfiledata, $offset, 4);
$offset += 4;
$chunk['type_raw'] = BigEndian2Int($chunk['type_text']);
$chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']);
$offset += $chunk['data_length'];
$chunk['crc'] = BigEndian2Int(substr($PNGfiledata, $offset, 4));
$offset += 4;
$chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000);
$chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000);
$chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000);
$chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020);
switch ($chunk['type_text']) {
case 'IHDR': // Image Header
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['width'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 4));
$ThisFileInfo['png'][$chunk['type_text']]['height'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 4, 4));
$ThisFileInfo['png'][$chunk['type_text']]['raw']['bit_depth'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 8, 1));
$ThisFileInfo['png'][$chunk['type_text']]['raw']['color_type'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 9, 1));
$ThisFileInfo['png'][$chunk['type_text']]['raw']['compression_method'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 10, 1));
$ThisFileInfo['png'][$chunk['type_text']]['raw']['filter_method'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 11, 1));
$ThisFileInfo['png'][$chunk['type_text']]['raw']['interlace_method'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 12, 1));
$ThisFileInfo['png'][$chunk['type_text']]['compression_method_text'] = PNGcompressionMethodLookup($ThisFileInfo['png'][$chunk['type_text']]['raw']['compression_method']);
$ThisFileInfo['png'][$chunk['type_text']]['color_type']['palette'] = (bool) ($ThisFileInfo['png'][$chunk['type_text']]['raw']['color_type'] & 0x01);
$ThisFileInfo['png'][$chunk['type_text']]['color_type']['true_color'] = (bool) ($ThisFileInfo['png'][$chunk['type_text']]['raw']['color_type'] & 0x02);
$ThisFileInfo['png'][$chunk['type_text']]['color_type']['alpha'] = (bool) ($ThisFileInfo['png'][$chunk['type_text']]['raw']['color_type'] & 0x04);
$ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['png'][$chunk['type_text']]['width'];
$ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['png'][$chunk['type_text']]['height'];
break;
case 'PLTE': // Palette
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$paletteoffset = 0;
for ($i = 0; $i <= 255; $i++) {
//$ThisFileInfo['png'][$chunk['type_text']]['red'][$i] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
//$ThisFileInfo['png'][$chunk['type_text']]['green'][$i] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
//$ThisFileInfo['png'][$chunk['type_text']]['blue'][$i] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
$red = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
$green = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
$blue = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $paletteoffset++, 1));
$ThisFileInfo['png'][$chunk['type_text']][$i] = (($red << 16) | ($green << 8) | ($blue));
}
break;
case 'tRNS': // Transparency
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
switch ($ThisFileInfo['png']['IHDR']['raw']['color_type']) {
case 0:
$ThisFileInfo['png'][$chunk['type_text']]['transparent_color_gray'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 2));
break;
case 2:
$ThisFileInfo['png'][$chunk['type_text']]['transparent_color_red'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 2));
$ThisFileInfo['png'][$chunk['type_text']]['transparent_color_green'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 2));
$ThisFileInfo['png'][$chunk['type_text']]['transparent_color_blue'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 2));
break;
case 3:
for ($i = 0; $i < strlen($ThisFileInfo['png'][$chunk['type_text']]['header']['data']); $i++) {
$ThisFileInfo['png'][$chunk['type_text']]['palette_opacity'][$i] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $i, 1));
}
break;
case 4:
case 6:
$ThisFileInfo['error'] .= "\n".'Invalid color_type in tRNS chunk: '.$ThisFileInfo['png']['IHDR']['raw']['color_type'];
default:
$ThisFileInfo['warning'] .= "\n".'Unhandled color_type in tRNS chunk: '.$ThisFileInfo['png']['IHDR']['raw']['color_type'];
break;
}
break;
case 'gAMA': // Image Gamma
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['gamma'] = BigEndian2Int($ThisFileInfo['png'][$chunk['type_text']]['header']['data']) / 100000;
break;
case 'cHRM': // Primary Chromaticities
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['white_x'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['white_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 4, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['red_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 8, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['red_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 12, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['green_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 16, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['green_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 20, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['blue_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 24, 4)) / 100000;
$ThisFileInfo['png'][$chunk['type_text']]['blue_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 28, 4)) / 100000;
break;
case 'sRGB': // Standard RGB Color Space
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['reindering_intent'] = BigEndian2Int($ThisFileInfo['png'][$chunk['type_text']]['header']['data']);
$ThisFileInfo['png'][$chunk['type_text']]['reindering_intent_text'] = PNGsRGBintentLookup($ThisFileInfo['png'][$chunk['type_text']]['reindering_intent']);
break;
case 'iCCP': // Embedded ICC Profile
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($profilename, $compressiondata) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['profile_name'] = $profilename;
$ThisFileInfo['png'][$chunk['type_text']]['compression_method'] = BigEndian2Int(substr($compressiondata, 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['compression_profile'] = substr($compressiondata, 1);
$ThisFileInfo['png'][$chunk['type_text']]['compression_method_text'] = PNGcompressionMethodLookup($ThisFileInfo['png'][$chunk['type_text']]['compression_method']);
break;
case 'tEXt': // Textual Data
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($keyword, $text) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['keyword'] = $keyword;
$ThisFileInfo['png'][$chunk['type_text']]['text'] = $text;
$ThisFileInfo['png']['comments'][$ThisFileInfo['png'][$chunk['type_text']]['keyword']][] = $ThisFileInfo['png'][$chunk['type_text']]['text'];
break;
case 'zTXt': // Compressed Textual Data
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($keyword, $otherdata) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['keyword'] = $keyword;
$ThisFileInfo['png'][$chunk['type_text']]['compression_method'] = BigEndian2Int(substr($otherdata, 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['compressed_text'] = substr($otherdata, 1);
$ThisFileInfo['png'][$chunk['type_text']]['compression_method_text'] = PNGcompressionMethodLookup($ThisFileInfo['png'][$chunk['type_text']]['compression_method']);
switch ($ThisFileInfo['png'][$chunk['type_text']]['compression_method']) {
case 0:
$ThisFileInfo['png'][$chunk['type_text']]['text'] = gzuncompress($ThisFileInfo['png'][$chunk['type_text']]['compressed_text']);
break;
default:
// unknown compression method
break;
}
if (isset($ThisFileInfo['png'][$chunk['type_text']]['text'])) {
$ThisFileInfo['png']['comments'][$ThisFileInfo['png'][$chunk['type_text']]['keyword']][] = $ThisFileInfo['png'][$chunk['type_text']]['text'];
}
break;
case 'iTXt': // International Textual Data
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($keyword, $otherdata) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['keyword'] = $keyword;
$ThisFileInfo['png'][$chunk['type_text']]['compression'] = (bool) BigEndian2Int(substr($otherdata, 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['compression_method'] = BigEndian2Int(substr($otherdata, 1, 1));
$ThisFileInfo['png'][$chunk['type_text']]['compression_method_text'] = PNGcompressionMethodLookup($ThisFileInfo['png'][$chunk['type_text']]['compression_method']);
list($languagetag, $translatedkeyword, $text) = explode(chr(0x00), substr($otherdata, 2), 3);
$ThisFileInfo['png'][$chunk['type_text']]['language_tag'] = $languagetag;
$ThisFileInfo['png'][$chunk['type_text']]['translated_keyword'] = utf8_decode($translatedkeyword);
if ($ThisFileInfo['png'][$chunk['type_text']]['compression']) {
switch ($ThisFileInfo['png'][$chunk['type_text']]['compression_method']) {
case 0:
$ThisFileInfo['png'][$chunk['type_text']]['text'] = utf8_decode(gzuncompress($text));
break;
default:
// unknown compression method
break;
}
} else {
$ThisFileInfo['png'][$chunk['type_text']]['text'] = utf8_decode($text);
}
if (isset($ThisFileInfo['png'][$chunk['type_text']]['text'])) {
$ThisFileInfo['png']['comments'][$ThisFileInfo['png'][$chunk['type_text']]['keyword']][] = $ThisFileInfo['png'][$chunk['type_text']]['text'];
}
break;
case 'bKGD': // Background Color
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
switch ($ThisFileInfo['png']['IHDR']['raw']['color_type']) {
case 0:
case 4:
$ThisFileInfo['png'][$chunk['type_text']]['background_gray'] = BigEndian2Int($ThisFileInfo['png'][$chunk['type_text']]['header']['data']);
break;
case 2:
case 6:
$ThisFileInfo['png'][$chunk['type_text']]['background_red'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0 * $ThisFileInfo['png']['IHDR']['raw']['bit_depth'], $ThisFileInfo['png']['IHDR']['raw']['bit_depth']));
$ThisFileInfo['png'][$chunk['type_text']]['background_green'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1 * $ThisFileInfo['png']['IHDR']['raw']['bit_depth'], $ThisFileInfo['png']['IHDR']['raw']['bit_depth']));
$ThisFileInfo['png'][$chunk['type_text']]['background_blue'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2 * $ThisFileInfo['png']['IHDR']['raw']['bit_depth'], $ThisFileInfo['png']['IHDR']['raw']['bit_depth']));
break;
case 3:
$ThisFileInfo['png'][$chunk['type_text']]['background_index'] = BigEndian2Int($ThisFileInfo['png'][$chunk['type_text']]['header']['data']);
break;
default:
break;
}
break;
case 'pHYs': // Physical Pixel Dimensions
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['pixels_per_unit_x'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 4));
$ThisFileInfo['png'][$chunk['type_text']]['pixels_per_unit_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 4, 4));
$ThisFileInfo['png'][$chunk['type_text']]['unit_specifier'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 8, 1));
$ThisFileInfo['png'][$chunk['type_text']]['unit'] = PNGpHYsUnitLookup($ThisFileInfo['png'][$chunk['type_text']]['unit_specifier']);
break;
case 'sBIT': // Significant Bits
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
switch ($ThisFileInfo['png']['IHDR']['raw']['color_type']) {
case 0:
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_gray'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
break;
case 2:
case 3:
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_red'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_green'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_blue'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2, 1));
break;
case 4:
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_gray'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_alpha'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1, 1));
break;
case 6:
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_red'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_green'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_blue'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2, 1));
$ThisFileInfo['png'][$chunk['type_text']]['significant_bits_alpha'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 3, 1));
break;
default:
break;
}
break;
case 'sPLT': // Suggested Palette
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($palettename, $otherdata) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['palette_name'] = $palettename;
$sPLToffset = 0;
$ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bits'] = BigEndian2Int(substr($otherdata, $sPLToffset, 1));
$sPLToffset += 1;
$ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes'] = $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bits'] / 8;
$paletteCounter = 0;
while ($sPLToffset < strlen($otherdata)) {
$ThisFileInfo['png'][$chunk['type_text']]['red'][$paletteCounter] = BigEndian2Int(substr($otherdata, $sPLToffset, $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes']));
$sPLToffset += $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes'];
$ThisFileInfo['png'][$chunk['type_text']]['green'][$paletteCounter] = BigEndian2Int(substr($otherdata, $sPLToffset, $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes']));
$sPLToffset += $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes'];
$ThisFileInfo['png'][$chunk['type_text']]['blue'][$paletteCounter] = BigEndian2Int(substr($otherdata, $sPLToffset, $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes']));
$sPLToffset += $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes'];
$ThisFileInfo['png'][$chunk['type_text']]['alpha'][$paletteCounter] = BigEndian2Int(substr($otherdata, $sPLToffset, $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes']));
$sPLToffset += $ThisFileInfo['png'][$chunk['type_text']]['sample_depth_bytes'];
$ThisFileInfo['png'][$chunk['type_text']]['frequency'][$paletteCounter] = BigEndian2Int(substr($otherdata, $sPLToffset, 2));
$sPLToffset += 2;
$paletteCounter++;
}
break;
case 'hIST': // Palette Histogram
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$hISTcounter = 0;
while ($hISTcounter < strlen($ThisFileInfo['png'][$chunk['type_text']]['header']['data'])) {
$ThisFileInfo['png'][$chunk['type_text']][$hISTcounter] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $hISTcounter / 2, 2));
$hISTcounter += 2;
}
break;
case 'tIME': // Image Last-Modification Time
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['year'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 2));
$ThisFileInfo['png'][$chunk['type_text']]['month'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2, 1));
$ThisFileInfo['png'][$chunk['type_text']]['day'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 3, 1));
$ThisFileInfo['png'][$chunk['type_text']]['hour'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 4, 1));
$ThisFileInfo['png'][$chunk['type_text']]['minute'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 5, 1));
$ThisFileInfo['png'][$chunk['type_text']]['second'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 6, 1));
$ThisFileInfo['png'][$chunk['type_text']]['unix'] = gmmktime($ThisFileInfo['png'][$chunk['type_text']]['hour'], $ThisFileInfo['png'][$chunk['type_text']]['minute'], $ThisFileInfo['png'][$chunk['type_text']]['second'], $ThisFileInfo['png'][$chunk['type_text']]['month'], $ThisFileInfo['png'][$chunk['type_text']]['day'], $ThisFileInfo['png'][$chunk['type_text']]['year']);
break;
case 'oFFs': // Image Offset
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['position_x'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 4), false, true);
$ThisFileInfo['png'][$chunk['type_text']]['position_y'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 4, 4), false, true);
$ThisFileInfo['png'][$chunk['type_text']]['unit_specifier'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 8, 1));
$ThisFileInfo['png'][$chunk['type_text']]['unit'] = PNGoFFsUnitLookup($ThisFileInfo['png'][$chunk['type_text']]['unit_specifier']);
break;
case 'pCAL': // Calibration Of Pixel Values
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
list($calibrationname, $otherdata) = explode(chr(0x00), $ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2);
$ThisFileInfo['png'][$chunk['type_text']]['calibration_name'] = $calibrationname;
$pCALoffset = 0;
$ThisFileInfo['png'][$chunk['type_text']]['original_zero'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $pCALoffset, 4), false, true);
$pCALoffset += 4;
$ThisFileInfo['png'][$chunk['type_text']]['original_max'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $pCALoffset, 4), false, true);
$pCALoffset += 4;
$ThisFileInfo['png'][$chunk['type_text']]['equation_type'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $pCALoffset, 1));
$pCALoffset += 1;
$ThisFileInfo['png'][$chunk['type_text']]['equation_type_text'] = PNGpCALequationTypeLookup($ThisFileInfo['png'][$chunk['type_text']]['equation_type']);
$ThisFileInfo['png'][$chunk['type_text']]['parameter_count'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $pCALoffset, 1));
$pCALoffset += 1;
$ThisFileInfo['png'][$chunk['type_text']]['parameters'] = explode(chr(0x00), substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], $pCALoffset));
break;
case 'sCAL': // Physical Scale Of Image Subject
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']]['unit_specifier'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
$ThisFileInfo['png'][$chunk['type_text']]['unit'] = PNGsCALUnitLookup($ThisFileInfo['png'][$chunk['type_text']]['unit_specifier']);
list($pixelwidth, $pixelheight) = explode(chr(0x00), substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1));
$ThisFileInfo['png'][$chunk['type_text']]['pixel_width'] = $pixelwidth;
$ThisFileInfo['png'][$chunk['type_text']]['pixel_height'] = $pixelheight;
break;
case 'gIFg': // GIF Graphic Control Extension
$gIFgCounter = 0;
if (isset($ThisFileInfo['png'][$chunk['type_text']]) && is_array($ThisFileInfo['png'][$chunk['type_text']])) {
$gIFgCounter = count($ThisFileInfo['png'][$chunk['type_text']]);
}
$ThisFileInfo['png'][$chunk['type_text']][$gIFgCounter]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']][$gIFgCounter]['disposal_method'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 1));
$ThisFileInfo['png'][$chunk['type_text']][$gIFgCounter]['user_input_flag'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 1, 1));
$ThisFileInfo['png'][$chunk['type_text']][$gIFgCounter]['delay_time'] = BigEndian2Int(substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 2, 2));
break;
case 'gIFx': // GIF Application Extension
$gIFxCounter = 0;
if (isset($ThisFileInfo['png'][$chunk['type_text']]) && is_array($ThisFileInfo['png'][$chunk['type_text']])) {
$gIFxCounter = count($ThisFileInfo['png'][$chunk['type_text']]);
}
$ThisFileInfo['png'][$chunk['type_text']][$gIFxCounter]['header'] = $chunk;
$ThisFileInfo['png'][$chunk['type_text']][$gIFxCounter]['application_identifier'] = substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 0, 8);
$ThisFileInfo['png'][$chunk['type_text']][$gIFxCounter]['authentication_code'] = substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 8, 3);
$ThisFileInfo['png'][$chunk['type_text']][$gIFxCounter]['application_data'] = substr($ThisFileInfo['png'][$chunk['type_text']]['header']['data'], 11);
break;
case 'IDAT': // Image Data
$idatinformationfieldindex = 0;
if (isset($ThisFileInfo['png']['IDAT']) && is_array($ThisFileInfo['png']['IDAT'])) {
$idatinformationfieldindex = count($ThisFileInfo['png']['IDAT']);
}
unset($chunk['data']);
$ThisFileInfo['png'][$chunk['type_text']][$idatinformationfieldindex]['header'] = $chunk;
break;
case 'IEND': // Image Trailer
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
break;
default:
//unset($chunk['data']);
$ThisFileInfo['png'][$chunk['type_text']]['header'] = $chunk;
$ThisFileInfo['warning'] .= "\n".'Unhandled chunk type: '.$chunk['type_text'];
break;
}
}
// PNG tags have highest priority
if (!empty($ThisFileInfo['png']['comments'])) {
CopyFormatCommentsToRootComments($ThisFileInfo['png']['comments'], $ThisFileInfo, true, true, true);
// add tag to array of tags
$ThisFileInfo['tags'][] = 'png';
}
return true;
}
function PNGsRGBintentLookup($sRGB) {
static $PNGsRGBintentLookup = array();
if (empty($PNGsRGBintentLookup)) {
$PNGsRGBintentLookup[0] = 'Perceptual';
$PNGsRGBintentLookup[1] = 'Relative colorimetric';
$PNGsRGBintentLookup[2] = 'Saturation';
$PNGsRGBintentLookup[3] = 'Absolute colorimetric';
}
return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid');
}
function PNGcompressionMethodLookup($compressionmethod) {
static $PNGcompressionMethodLookup = array();
if (empty($PNGcompressionMethodLookup)) {
$PNGcompressionMethodLookup[0] = 'deflate/inflate';
}
return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid');
}
function PNGpHYsUnitLookup($unitid) {
static $PNGpHYsUnitLookup = array();
if (empty($PNGpHYsUnitLookup)) {
$PNGpHYsUnitLookup[0] = 'unknown';
$PNGpHYsUnitLookup[1] = 'meter';
}
return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid');
}
function PNGoFFsUnitLookup($unitid) {
static $PNGoFFsUnitLookup = array();
if (empty($PNGoFFsUnitLookup)) {
$PNGoFFsUnitLookup[0] = 'pixel';
$PNGoFFsUnitLookup[1] = 'micrometer';
}
return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid');
}
function PNGpCALequationTypeLookup($equationtype) {
static $PNGpCALequationTypeLookup = array();
if (empty($PNGpCALequationTypeLookup)) {
$PNGpCALequationTypeLookup[0] = 'Linear mapping';
$PNGpCALequationTypeLookup[1] = 'Base-e exponential mapping';
$PNGpCALequationTypeLookup[2] = 'Arbitrary-base exponential mapping';
$PNGpCALequationTypeLookup[3] = 'Hyperbolic mapping';
}
return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid');
}
function PNGsCALUnitLookup($unitid) {
static $PNGsCALUnitLookup = array();
if (empty($PNGsCALUnitLookup)) {
$PNGsCALUnitLookup[0] = 'meter';
$PNGsCALUnitLookup[1] = 'radian';
}
return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid');
}
?>
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