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<?php
/**
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*
* This code was originally taken from:
* https://github.com/ktomk/Miscellaneous/blob/master/get_png_imageinfo/get_png_imageinfo.php
* It has been modified to fix bugs and improve code formatting
*
* Get image-information from PNG file
*
* php's getimagesize does not support additional image information
* from PNG files like channels or bits.
*
* get_png_imageinfo() can be used to obtain this information
* from PNG files.
*
* @author Tom Klingenberg <lastflood.net>
* @license Apache 2.0
* @link https://github.com/ktomk/Miscellaneous/blob/master/get_png_imageinfo/get_png_imageinfo.php
* @link http://www.libpng.org/pub/png/spec/iso/index-object.html#11IHDR
*
* @param string $file filename
* @return array|bool image information, FALSE on error
*/
function get_png_imageinfo($file) {
if (! is_file($file)) {
return false;
}
$info = unpack(
'a8sig/Nchunksize/A4chunktype/Nwidth/Nheight/Cbit-depth/Ccolor/Ccompression/Cfilter/Cinterface',
file_get_contents($file, 0, null, 0, 29)
);
if (empty($info)) {
return false;
}
if ("\x89\x50\x4E\x47\x0D\x0A\x1A\x0A" != array_shift($info)) {
return false; // no PNG signature
}
if (13 != array_shift($info)) {
return false; // wrong length for IHDR chunk
}
if ('IHDR'!==array_shift($info)) {
return false; // a non-IHDR chunk singals invalid data
}
$color = $info['color'];
$type = array(
0 => 'Greyscale',
2 => 'Truecolour',
3 => 'Indexed-colour',
4 => 'Greyscale with alpha',
6 => 'Truecolour with alpha'
);
if (empty($type[$color])) {
return false; // invalid color value
}
$info['color-type'] = $type[$color];
$samples = ((($color % 4) % 3) ? 3 : 1) + ($color > 3 ? 1 : 0);
$info['channels'] = $samples;
$info['bits'] = $info['bit-depth'];
return $info;
}