Initial commit

lib/assets/javascripts/dashboard/helpers/bytes-to-size.js

@@ -0,0 +1,43 @@
+/**
+ * Object representing human-readable version of a given number of bytes.
+ *
+ * (Extracted logic from an old dashboard view)
+ *
+ * @param bytes {Number}
+ * @returns {Object}
+ */
+const BytesToSize = function (bytes) {
+  if (!(this instanceof BytesToSize)) return new BytesToSize(bytes);
+
+  this.bytes = bytes;
+  if (bytes === 0) {
+    this.unit = 0;
+  } else {
+    this.unit = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
+  }
+
+  return this;
+};
+
+BytesToSize.prototype.size = function () {
+  return (this.bytes / Math.pow(1024, this.unit));
+};
+
+BytesToSize.prototype.UNIT_SUFFIXES = ['B', 'kB', 'MB', 'GB', 'TB'];
+BytesToSize.prototype.suffix = function () {
+  return this.UNIT_SUFFIXES[this.unit];
+};
+
+BytesToSize.prototype.toString = function (decimals) {
+  let size = this.size();
+  if (decimals) {
+    // 1 decimal: 9.995 => 9.9
+    const round = Math.pow(10, decimals);
+    size = Math.floor(size * round) / round;
+  } else {
+    size = Math.floor(size);
+  }
+  return size + this.suffix();
+};
+
+module.exports = BytesToSize;