LogDog: Fix archived log stream read errors.

common/recordio/size.go

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package recordio
+
+// FrameHeaderSize calculates the size of the RecordIO frame header for a given
+// amount of data.
+//
+// A RecordIO frame header is a Uvarint containing the length. Uvarint values
+// contain 7 bits of size data and 1 continuation bit (see encoding/binary).
+func FrameHeaderSize(s int64) int {
+        size := 1
+        for s >>= 7; s > 0; s >>= 7 {
+                size++
+        }
+        return size
+}