I'm getting the following error "unmarshaling error: proto: cannot parse reserved wire type" while unmarshaling a binary protobuf message.
newMessage := &MessageName{}
err = proto.Unmarshal(data, newMessage)
Here for data I'm reading from Protobuf Binary file whose contents look something like the Binary format given here -> What does the protobuf text format look like?
After reading the file and storing in data, data looks something like this [23 67 102 56 ... ]
How to fix this error?
[23 67 102 56 ... ] looks like a slice of ints, I'll assume the ints are the byte values. If that's true, this is not a protobuf stream!
Looking at the protobuf docs, the first byte is always a varint key. This is made up of a field number (first 5 bits) and a wire type (last 3 bits). Your int of 23 looks like this:
0001 0111
^ ^
varint wiretype
The valid wire types are shown in the docs. Your binary value 111 is decimal 7, which is not one of the listed types. Hence: cannot parse reserved wire type
Type Meaning Used For
0 Varint int32, int64, uint32, uint64, sint32, sint64, bool, enum
1 64-bit fixed64, sfixed64, double
2 Length-delimited string, bytes, embedded messages, packed repeated fields
3 Start group groups (deprecated)
4 End group groups (deprecated)
5 32-bit fixed32, sfixed32, float