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nng_proto: add comments. fix return statement in serialize_proto_to_nng()

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This commit is contained in:
Florian Lüke 2024-12-25 18:29:22 +01:00
parent ba54b5ff19
commit d5f9b87896
2 changed files with 10 additions and 1 deletions
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9
include/mesytec-mnode/mnode_nng_proto.h
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@ -7,8 +7,17 @@
namespace mesytec::mnode::nng
{
// Format is: [u32 size][protobuf message]
// Appends size prefix and serialied message contents to the nng msg.
// Returns the number of bytes written.
size_t serialize_proto_to_nng(const google::protobuf::MessageLite &message, nng_msg *msg);
// Deserializes a protobuf message from an nng msg.
// Returns the number of bytes used (size prefix + message).
size_t deserialize_proto_from_nng(google::protobuf::MessageLite &message, nng_msg *msg);
// Same as above but also trims the message.
size_t deserialize_proto_from_nng_trim(google::protobuf::MessageLite &message, nng_msg *msg);
} // namespace mesytec::mnode::nng

2
src/mnode_nng_proto.cc
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@ -10,7 +10,7 @@ size_t serialize_proto_to_nng(const google::protobuf::MessageLite &message, nng_
auto messageSize = message.ByteSizeLong();
if (auto res = nng_msg_realloc(msg, nng_msg_len(msg) + sizeof(u32) + messageSize))
return false;
return 0;
*reinterpret_cast<u32 *>(nng_msg_body(msg)) = messageSize;
if (!message.SerializeToArray(reinterpret_cast<u8 *>(nng_msg_body(msg)) + sizeof(u32),