Minor clean-ups.

* Track the length of the dex file in RawDexFile.  This can be used to
  improve its assertions.

* Move a sanity check for MmapCloser into the constructor.

* Add a TODO for moving the base64 openers into test code.

* Make the base64 decoder assume C strings, mention this in a comment.

Change-Id: Ib4d5a43d23ebe8819032763c42c536c8b826723a
5 files changed