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-rw-r--r--modules/getid3/module.graphic.png.php80
1 files changed, 40 insertions, 40 deletions
diff --git a/modules/getid3/module.graphic.png.php b/modules/getid3/module.graphic.png.php
index e697e961..0593b98f 100644
--- a/modules/getid3/module.graphic.png.php
+++ b/modules/getid3/module.graphic.png.php
@@ -22,8 +22,8 @@
//
// $Id: module.graphic.png.php,v 1.4 2006/11/02 10:48:02 ah Exp $
-
-
+
+
class getid3_png extends getid3_handler
{
@@ -46,20 +46,20 @@ class getid3_png extends getid3_handler
$offset = 8;
while (((ftell($getid3->fp) - (strlen($png_filedata) - $offset)) < $getid3->info['filesize'])) {
-
+
$chunk['data_length'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4));
$offset += 4;
while (((strlen($png_filedata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($getid3->fp) < $getid3->info['filesize'])) {
$png_filedata .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
}
-
+
$chunk['type_text'] = substr($png_filedata, $offset, 4);
$chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']);
$offset += 4;
-
+
$chunk['data'] = substr($png_filedata, $offset, $chunk['data_length']);
$offset += $chunk['data_length'];
-
+
$chunk['crc'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4));
$offset += 4;
@@ -78,8 +78,8 @@ class getid3_png extends getid3_handler
$info_png_chunk_type_text['header'] = $chunk;
$info_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
$info_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
-
- getid3_lib::ReadSequence('BigEndian2Int', $info_png_chunk_type_text['raw'], $chunk['data'], 8,
+
+ getid3_lib::ReadSequence('BigEndian2Int', $info_png_chunk_type_text['raw'], $chunk['data'], 8,
array (
'bit_depth' => 1,
'color_type' => 1,
@@ -196,12 +196,12 @@ class getid3_png extends getid3_handler
$info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
$info_png_chunk_type_text['compressed_text'] = substr($otherdata, 1);
$info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']);
-
+
if ($info_png_chunk_type_text['compression_method'] != 0) {
// unknown compression method
break;
}
-
+
if (function_exists('gzuncompress')) {
$info_png_chunk_type_text['text'] = gzuncompress($info_png_chunk_type_text['compressed_text']);
}
@@ -211,7 +211,7 @@ class getid3_png extends getid3_handler
}
$this->zlib_warning = true;
}
-
+
if (isset($info_png_chunk_type_text['text'])) {
$info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text'];
@@ -308,14 +308,14 @@ class getid3_png extends getid3_handler
$info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
$info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
$info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]);
- break;
-
- case 4:
+ break;
+
+ case 4:
$info_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
$info_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
- break;
-
- case 6:
+ break;
+
+ case 6:
$info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
$info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
$info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]);
@@ -330,32 +330,32 @@ class getid3_png extends getid3_handler
case 'sPLT': // Suggested Palette
$info_png_chunk_type_text['header'] = $chunk;
-
+
list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2);
$info_png_chunk_type_text['palette_name'] = $palettename;
-
+
$info_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int($otherdata[0]);
$info_png_chunk_type_text['sample_depth_bytes'] = $info_png_chunk_type_text['sample_depth_bits'] / 8;
-
+
$s_plt_offset = 1;
$paletteCounter = 0;
while ($s_plt_offset < strlen($otherdata)) {
-
+
$info_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
$s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
-
+
$info_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
$s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
-
+
$info_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
$s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
-
+
$info_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
$s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
-
+
$info_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, 2));
$s_plt_offset += 2;
-
+
$paletteCounter++;
}
break;
@@ -465,7 +465,7 @@ class getid3_png extends getid3_handler
public static function PNGsRGBintentLookup($sRGB) {
-
+
static $lookup = array (
0 => 'Perceptual',
1 => 'Relative colorimetric',
@@ -478,14 +478,14 @@ class getid3_png extends getid3_handler
public static function PNGcompressionMethodLookup($compression_method) {
-
+
return ($compression_method == 0 ? 'deflate/inflate' : 'invalid');
}
-
-
+
+
public static function PNGpHYsUnitLookup($unit_id) {
-
+
static $lookup = array (
0 => 'unknown',
1 => 'meter'
@@ -493,10 +493,10 @@ class getid3_png extends getid3_handler
return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
}
-
-
+
+
public static function PNGoFFsUnitLookup($unit_id) {
-
+
static $lookup = array (
0 => 'pixel',
1 => 'micrometer'
@@ -504,10 +504,10 @@ class getid3_png extends getid3_handler
return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
}
-
-
+
+
public static function PNGpCALequationTypeLookup($equation_type) {
-
+
static $lookup = array (
0 => 'Linear mapping',
1 => 'Base-e exponential mapping',
@@ -528,10 +528,10 @@ class getid3_png extends getid3_handler
return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
}
-
-
+
+
public static function IHDRcalculateBitsPerSample($color_type, $bit_depth) {
-
+
switch ($color_type) {
case 0: // Each pixel is a grayscale sample.
return $bit_depth;
generated by cgit (git 2.34.1) at 2025-08-14 01:14:34 +0000