leommoore

File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.

For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.

This gives an ongoing list of file-type magic numbers.

Image Files

fuzzyfox

/* jshint browser: true, devel: true */

/**
 * preg_replace (from PHP) in JavaScript!
 *
 * This is basically a pattern replace. You can use a regex pattern to search and 
 * another for the replace. For more information see the PHP docs on the original 
 * function (http://php.net/manual/en/function.preg-replace.php), and for more on 
 * JavaScript flavour regex visit http://www.regular-expressions.info/javascript.html
 *

dypsilon

Frontend Development

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