std::shared_ptr<MyBuffer> ProtobufCodec::Encode(const CMessage& message)
{
std::shared_ptr<MyBuffer> ptrBuffer(new MyBuffer());
assert(0 == ptrBuffer->readableBytes());
const std::string& typeName = message.GetTypeName();
int32_t nameLen = static_cast<int32_t>(typeName.size() + 1);//'\0'
ptrBuffer->appendUint32(nameLen);
ptrBuffer->append(typeName.c_str(), nameLen);
//消息内容
size_t byte_size = message.ByteSize();
//ensure memory enough
ptrBuffer->ensureWritableBytes(byte_size);
//write data
message.SerializeWithCachedSizesToArray(reinterpret_cast<uint8_t*>(ptrBuffer->beginWrite()));
ptrBuffer->commit(byte_size);//move write index
//检验和
uint32_t checkSum = adler32(1, reinterpret_cast<const Bytef*>(ptrBuffer->peek()), ptrBuffer->readableBytes());
ptrBuffer->appendUint32(checkSum);
assert(ptrBuffer->readableBytes() == sizeof(nameLen)+nameLen + byte_size + sizeof(checkSum));
//消息长度
int32_t len = htonl(static_cast<int32_t>(ptrBuffer->readableBytes()));
ptrBuffer->prepend(&len, sizeof(len));
//delimiter
ptrBuffer->append("\r\n", 2);
return ptrBuffer;
}
