Deserializing protobuf from C++ and reserializing in C# gives different output -

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i have file protobuf message in in byte format, when read file , deserialize protobuf works fine (i can read objects fields , correct), however, when reserialize , save file, bytes different original (causing compatibility issues).

more specifically, after string , before bool theres bytes '18 00' added.

i tried playing around dataformat options protobuf-net exact same result original, no avail.

does know of options in protobuf-net in regards saving string or bool explain 2 bytes?

also, ulong being saved differently in bytes aswell.

i don't have control on original file, know it's compiled/serialized c++

my goal recreate exact same file (bytewise) serializing in c#, identical file serialized c++.

this comes down how properties handled. default,

protogen -i:my.proto -o:my.cs

generates simple properties, of form:

private bool _some_value = default(bool); [global::protobuf.protomember(3, isrequired = false, name=@"some_value",     dataformat = global::protobuf.dataformat.default)] [global::system.componentmodel.defaultvalue(default(bool))] public bool some_value {   { return _some_value; }   set { _some_value = value; } }

this fine scenarios, doesn't quite support every "was value specified?" scenario.

however, can instead:

protogen -i:my.proto -o:my.cs -p:detectmissing

which generates more thorough:

private bool? _some_value; [global::protobuf.protomember(3, isrequired = false, name=@"some_value",     dataformat = global::protobuf.dataformat.default)] public bool some_value {   { return _some_value?? default(bool); }   set { _some_value = value; } } [global::system.xml.serialization.xmlignore] [global::system.componentmodel.browsable(false)] public bool some_valuespecified {   { return this._some_value != null; }   set { if (value == (this._some_value== null))       this._some_value = value ? this.some_value : (bool?)null; } } private bool shouldserializesome_value() { return some_valuespecified; } private void resetsome_value() { some_valuespecified = false; }

this has full support tracking explicit assignment, including support ui-binding , serialization frameworks (not protobuf-net).

the 2-byte difference difference between "false, not serialized due implicit default value" , "false, known explicitly specified false, , serialized".

so fix is: include -p:detectmissing when using protogen.


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