[isJPEG]

Description

This tag reads the image type marker contained in every JPEG file to confirm that the file is indeed a JPEG image. This tag will confirm JPEGness regardless of the extension of the file. This tag assumes that it has permission to read the file in question. All JPEG image files contain a marker which looks like so: JFIF. This tag looks for that marker. This tag may return the wrong answer if the file contains that marker and is not an actual JPEG image file.

Sample Usage

isJPEG('/path/to/image.jpg'); // true

isJPEG('/path/to/file.txt'); // false

Source Code

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define_tag('isJPEG', -required='path');
	protect;
		return: file(#path)->setPosition(7) & read(4) == 'JFIF';
	/protect;
	return:false;
/define_tag;

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