display "<1 kB" for really small files

* added parameters for humanFileSize to trigger that behaviour
* add unit tests for that

apps/files/js/filelist.js

@@ -613,7 +613,7 @@
 
 			// size column
 			if (typeof(fileData.size) !== 'undefined' && fileData.size >= 0) {
-				simpleSize = humanFileSize(parseInt(fileData.size, 10));
+				simpleSize = humanFileSize(parseInt(fileData.size, 10), true);
 				sizeColor = Math.round(160-Math.pow((fileData.size/(1024*1024)),2));
 			} else {
 				simpleSize = t('files', 'Pending');

apps/files/tests/js/filelistSpec.js

@@ -252,7 +252,7 @@ describe('OCA.Files.FileList tests', function() {
 				size: '0'
 			};
 			var $tr = fileList.add(fileData);
-			expect($tr.find('.filesize').text()).toEqual('0 B');
+			expect($tr.find('.filesize').text()).toEqual('0 kB');
 		});
 		it('adds new file to the end of the list', function() {
 			var $tr;

core/js/js.js

@@ -1163,9 +1163,10 @@ $.fn.filterAttr = function(attr_name, attr_value) {
 /**
  * Returns a human readable file size
  * @param {number} size Size in bytes
+ * @param {boolean} skipSmallSizes return '< 1 kB' for small files
  * @return {string}
  */
-function humanFileSize(size) {
+function humanFileSize(size, skipSmallSizes) {
 	var humanList = ['B', 'kB', 'MB', 'GB', 'TB'];
 	// Calculate Log with base 1024: size = 1024 ** order
 	var order = size?Math.floor(Math.log(size) / Math.log(1024)):0;
@@ -1173,6 +1174,13 @@ function humanFileSize(size) {
 	order = Math.min(humanList.length - 1, order);
 	var readableFormat = humanList[order];
 	var relativeSize = (size / Math.pow(1024, order)).toFixed(1);
+	if(skipSmallSizes === true && order === 0) {
+		if(relativeSize !== "0.0"){
+			return '< 1 kB';
+		} else {
+			return '0 kB';
+		}
+	}
 	if(order < 2){
 		relativeSize = parseFloat(relativeSize).toFixed(0);
 	}

core/js/tests/specs/coreSpec.js

@@ -489,6 +489,19 @@ describe('Core base tests', function() {
 					expect(OC.Util.humanFileSize(data[i][0])).toEqual(data[i][1]);
 				}
 			});
+			it('renders file sizes with the correct unit for small sizes', function() {
+				var data = [
+					[0, '0 kB'],
+					[125, '< 1 kB'],
+					[128000, '125 kB'],
+					[128000000, '122.1 MB'],
+					[128000000000, '119.2 GB'],
+					[128000000000000, '116.4 TB']
+				];
+				for (var i = 0; i < data.length; i++) {
+					expect(OC.Util.humanFileSize(data[i][0], true)).toEqual(data[i][1]);
+				}
+			});
 		});
 	});
 });