LogDog: Fix archived log stream read errors.

common/recordio/size.go

Index: common/recordio/size.go
diff --git a/common/recordio/size.go b/common/recordio/size.go
new file mode 100644
index 0000000000000000000000000000000000000000..73e058abccfbf5503d8ee5c0c3d4ab078a7cc1b8
--- /dev/null
+++ b/common/recordio/size.go
@@ -0,0 +1,18 @@
+// 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
+}