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// Adapted from the patch of [email protected] (Kenton Varda) // See https://github.com/google/protobuf/pull/710 for details. #ifndef GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__ #define GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__ #include <ostream> #include <google/protobuf/message_lite.h> #include <google/protobuf/io/coded_stream.h> #include <google/protobuf/io/zero_copy_stream_impl.h> namespace google { namespace protobuf { namespace util { // Write a single size-delimited message from the given stream. Delimited // format allows a single file or stream to contain multiple messages, // whereas normally writing multiple non-delimited messages to the same // stream would cause them to be merged. A delimited message is a varint // encoding the message size followed by a message of exactly that size. // // Note that if you want to *read* a delimited message from a file descriptor // or istream, you will need to construct an io::FileInputStream or // io::OstreamInputStream (implementations of io::ZeroCopyStream) and use the // utility function ParseDelimitedFromZeroCopyStream(). You must then // continue to use the same ZeroCopyInputStream to read all further data from // the stream until EOF. This is because these ZeroCopyInputStream // implementations are buffered: they read a big chunk of data at a time, // then parse it. As a result, they may read past the end of the delimited // message. There is no way for them to push the extra data back into the // underlying source, so instead you must keep using the same stream object. bool LIBPROTOBUF_EXPORT SerializeDelimitedToFileDescriptor(const MessageLite& message, int file_descriptor); bool LIBPROTOBUF_EXPORT SerializeDelimitedToOstream(const MessageLite& message, std::ostream* output); // Read a single size-delimited message from the given stream. Delimited // format allows a single file or stream to contain multiple messages, // whereas normally parsing consumes the entire input. A delimited message // is a varint encoding the message size followed by a message of exactly // that size. // // If |clean_eof| is not NULL, then it will be set to indicate whether the // stream ended cleanly. That is, if the stream ends without this method // having read any data at all from it, then *clean_eof will be set true, // otherwise it will be set false. Note that these methods return false // on EOF, but they also return false on other errors, so |clean_eof| is // needed to distinguish a clean end from errors. bool LIBPROTOBUF_EXPORT ParseDelimitedFromZeroCopyStream(MessageLite* message, io::ZeroCopyInputStream* input, bool* clean_eof); bool LIBPROTOBUF_EXPORT ParseDelimitedFromCodedStream(MessageLite* message, io::CodedInputStream* input, bool* clean_eof); // Write a single size-delimited message from the given stream. Delimited // format allows a single file or stream to contain multiple messages, // whereas normally writing multiple non-delimited messages to the same // stream would cause them to be merged. A delimited message is a varint // encoding the message size followed by a message of exactly that size. bool LIBPROTOBUF_EXPORT SerializeDelimitedToZeroCopyStream(const MessageLite& message, io::ZeroCopyOutputStream* output); bool LIBPROTOBUF_EXPORT SerializeDelimitedToCodedStream(const MessageLite& message, io::CodedOutputStream* output); } // namespace util } // namespace protobuf } // namespace google #endif // GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__