Adding computerFileSize in OC.Util

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

core/js/js.js

@@ -1625,6 +1625,51 @@ function humanFileSize(size, skipSmallSizes) {
 	return relativeSize + ' ' + readableFormat;
 }
 
+/**
+ * Returns a file size in bytes from a humanly readable string
+ * @param  {string} string file size in human readable format
+ * @return {number}
+ *
+ * Makes 2kB to 2048.
+ *
+ * Inspired by computerFileSize in helper.php
+ */
+function computerFileSize(string) {
+		var s = string.toLowerCase();
+
+		if (!isNaN(parseFloat(s)) && isFinite(s)) {
+			return parseFloat(s);
+		}
+
+		var bytes_array = {
+			'b' : 1,
+			'k' : 1024,
+			'kb': 1024,
+			'mb': 1024 * 1024,
+			'm' : 1024 * 1024,
+			'gb': 1024 * 1024 * 1024,
+			'g' : 1024 * 1024 * 1024,
+			'tb': 1024 * 1024 * 1024 * 1024,
+			't' : 1024 * 1024 * 1024 * 1024,
+			'pb': 1024 * 1024 * 1024 * 1024 * 1024,
+			'p' : 1024 * 1024 * 1024 * 1024 * 1024
+		};
+
+		var bytes = parseFloat(s);
+
+		var matches = s.match(/([kmgtp]?b?)$/i);
+		if (matches[1]) {
+			bytes = bytes * bytes_array[matches[1]];
+		}
+		else {
+			return false;
+		}
+
+		bytes = Math.round(bytes);
+		console.log(bytes);
+		return bytes;
+}
+
 /**
  * Format an UNIX timestamp to a human understandable format
  * @param {number} timestamp UNIX timestamp
@@ -1667,6 +1712,7 @@ function relative_modified_date(timestamp) {
 OC.Util = {
 	// TODO: remove original functions from global namespace
 	humanFileSize: humanFileSize,
+	computerFileSize: computerFileSize,
 
 	/**
 	 * @param timestamp

core/js/tests/specs/coreSpec.js

@@ -590,6 +590,26 @@ describe('Core base tests', function() {
 				}
 			});
 		});
+		describe('computerFileSize', function() {
+			it('correctly parses file sizes from a human readable formated string', function() {
+				var data = [
+					['0 B', 0],
+					['125 B', 125],
+					['125b', 125],
+					['125 KB', 128000],
+					['125kb', 128000],
+					['122.1 MB', 128031130, ],
+					['122.1mb', 128031130, ],
+					['119.2 GB', 127990025421],
+					['119.2gb', 127990025421],
+					['116.4 TB', 127983153473126],
+					['116.4tb', 127983153473126]
+				];
+				for (var i = 0; i < data.length; i++) {
+					expect(OC.Util.computerFileSize(data[i][0])).toEqual(data[i][1]);
+				}
+			});
+		});
 		describe('stripTime', function() {
 			it('strips time from dates', function() {
 				expect(OC.Util.stripTime(new Date(2014, 2, 24, 15, 4, 45, 24)))