or ChannelBuffer into a decoded ChannelBuffer and vice versa.  org.jboss.netty.handler.codec.compression Encoder and decoder which compresses and decompresses ChannelBuffer s in a compression format such as zlib and gzip .  org.jboss.netty.handler.codec.protobuf Encoder and decoder which transform a Google Protocol Buffers Message into a ChannelBuffer and vice versa.  org.jboss.netty.handler.codec.string Encoder and decoder which