Comment #8 on issue 374 by cbsm...@gmail.com: Add method in ByteString to avoid big buffer copy.
http://code.google.com/p/protobuf/issues/detail?id=374

Another approach that is not without merit is to represent the ByteString internally as a java.nio.ByteBuffer (which in a lot of ways is probably a better choice that ByteString anyway), which provides an asReadOnlyBuffer() method that is pretty efficient. There are a number of additional copy reduction benefits that might stem from this, as there are methods for doing I/O with ByteBuffer's that avoid additional copies.

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