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src/lib/strformat.js

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+// Short representation of time in the past.
+function shortDateFormat(then) {
+  var locale = window.navigator.userLanguage || window.navigator.language;
+  var now = new Date();
+  if (then.getFullYear() == now.getFullYear()) {
+    if (then.getMonth() == now.getMonth() && then.getDate() == now.getDate()) {
+	    return then.toLocaleTimeString(locale, {hour12: false, hour: '2-digit', minute: '2-digit'});
+    } else {
+	    return then.toLocaleDateString(locale,
+        {hour12: false, month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit'});
+    }
+  }
+  return then.toLocaleDateString(locale,
+    {hour12: false, year: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit'});
+}
+
+// Convert a number of bytes to human-readable format.
+function bytesToHumanSize(bytes) {
+  if (!bytes || bytes == 0) {
+    return '0 Bytes';
+  }
+
+  var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB'];
+  var bucket = Math.min(Math.floor(Math.log2(bytes) / 10) | 0, sizes.length-1);
+  var count = bytes / Math.pow(1024, bucket);
+  var round = bucket > 0 ? (count < 3 ? 2 : (count < 30 ? 1 : 0)) : 0;
+  return count.toFixed(round) + ' ' + sizes[bucket];
+}
+
+// Get 32 bit integer hash value for a string. Ideally it should produce the same value
+// as Java's String#hash().
+function stringHash(value) {
+  var hash = 0;
+  value = '' + value;
+  for (var i = 0; i < value.length; i++) {
+    hash = ((hash << 5) - hash) + value.charCodeAt(i);
+    hash = hash & hash; // Convert to 32bit integer
+  }
+  return hash;
+}