Plugins/sorting/file-size.js

/**
 * When dealing with computer file sizes, it is common to append a post fix
 * such as B, KB, MB or GB to a string in order to easily denote the order of
 * magnitude of the file size. This plug-in allows sorting to take these
 * indicates of size into account.
 * 
 * A counterpart type detection plug-in is also available.
 *
 *  @name File size
 *  @summary Sort abbreviated file sizes correctly (8MB, 4KB, etc)
 *  @author Allan Jardine - datatables.net
 *
 *  @example
 *    $('#example').DataTable( {
 *       columnDefs: [
 *         { type: 'file-size', targets: 0 }
 *       ]
 *    } );
 */

jQuery.fn.dataTable.ext.type.order['file-size-pre'] = function ( data ) {
    var units = data.replace( /[\d\.\s]/g, '' ).toLowerCase();
    var multiplier = 1;

    if ( units === 'kb' ) {
        multiplier = 1000;
    }
    else if ( units === 'mb' ) {
        multiplier = 1000000;
    }
    else if ( units === 'gb' ) {
        multiplier = 1000000000;
    }
    else if ( units === 'tb' ) {
        multiplier = 1000000000000;
    }
    else if ( units === 'pb' ) {
        multiplier = 1000000000000000;
    }

    return parseFloat( data ) * multiplier;
};