I've pushed the final release of Protobuf 2.3.0: http://code.google.com/p/protobuf/downloads/list
Documentation updates are still in review but I hope to have them up Monday. 2009-01-08 version 2.3.0: General * Parsers for repeated numeric fields now always accept both packed and unpacked input. The [packed=true] option only affects serializers. Therefore, it is possible to switch a field to packed format without breaking backwards-compatibility -- as long as all parties are using protobuf 2.3.0 or above, at least. * The generic RPC service code generated by the C++, Java, and Python generators can be disabled via file options: option cc_generic_services = false; option java_generic_services = false; option py_generic_services = false; This allows plugins to generate alternative code, possibly specific to some particular RPC implementation. protoc * Now supports a plugin system for code generators. Plugins can generate code for new languages or inject additional code into the output of other code generators. Plugins are just binaries which accept a protocol buffer on stdin and write a protocol buffer to stdout, so they may be written in any language. See src/google/protobuf/compiler/plugin.proto. **WARNING**: Plugins are experimental. The interface may change in a future version. * If the output location ends in .zip or .jar, protoc will write its output to a zip/jar archive instead of a directory. For example: protoc --java_out=myproto_srcs.jar --python_out=myproto.zip myproto.proto Currently the archive contents are not compressed, though this could change in the future. * inf, -inf, and nan can now be used as default values for float and double fields. C++ * Various speed and code size optimizations. * DynamicMessageFactory is now fully thread-safe. * Message::Utf8DebugString() method is like DebugString() but avoids escaping UTF-8 bytes. * Compiled-in message types can now contain dynamic extensions, through use of CodedInputStream::SetExtensionRegistry(). * Now compiles shared libraries (DLLs) by default on Cygwin and MinGW, to match other platforms. Use --disable-shared to avoid this. Java * parseDelimitedFrom() and mergeDelimitedFrom() now detect EOF and return false/null instead of throwing an exception. * Fixed some initialization ordering bugs. * Fixes for OpenJDK 7. Python * 10-25 times faster than 2.2.0, still pure-Python. * Calling a mutating method on a sub-message always instantiates the message in its parent even if the mutating method doesn't actually mutate anything (e.g. parsing from an empty string). * Expanded descriptors a bit.--
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