Hi Florian, Thanks for your quick response. I'm stuck on this.
1) It's not working. When I send the protobuf to the backend server (it's not our api nor server) using the first method, I get a right response. But using the second method I receive this error: ProtoBuf.ProtoException: Invalid wire-type; this usually means you have over-written a file without truncating or setting the length; see https://stackoverflow.com/q/2152978/23354 at ProtoBuf.ProtoReader.StartSubItem(ProtoReader reader) in C:\code\protobuf-net\src\protobuf-net\ProtoReader.cs:line 637 at ProtoBuf.ProtoReader.ReadTypedObject(Object value, Int32 key, ProtoReader reader, Type type) in C:\code\protobuf-net\src\protobuf-net\ProtoReader.cs:line 584 at proto_40(Object , ProtoReader ) at ProtoBuf.Meta.TypeModel.DeserializeCore(ProtoReader reader, Type type, Object value, Boolean noAutoCreate) in C:\code\protobuf-net\src\protobuf-net\Meta\TypeModel.cs:line 722 at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type type, SerializationContext context) in C:\code\protobuf-net\src\protobuf-net\Meta\TypeModel.cs:line 599 at WebBeds.Connect.AspNetCore.Formatters.ProtobufInputFormatter.ReadRequestBodyAsync(InputFormatterContext context) at Microsoft.AspNetCore.Mvc.Formatters.InputFormatter.ReadAsync(InputFormatterContext context) at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.BodyModelBinder.BindModelAsync(ModelBindingContext bindingContext) at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, Object value, Object container) at Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|26_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted 2) This is the proto: The request with the 'Meta' element: message Request { Meta Meta = 1; repeated int32 Hotels = 2 [packed = false]; Country Market = 3; repeated Room Rooms = 4; .bcl.DateTime CheckIn = 5; .bcl.DateTime CheckOut = 6; OptionalCriteria OptionalCriteria = 7; } The 'Meta' element that contains the 'CutOffTime' that we want to modify: message Meta { int32 Client = 1; int32 Brand = 2; bool UseCache = 3; .bcl.TimeSpan CutOffTime = 4; bool B2C = 5; Language Language = 6; Currency Currency = 7; bool IncludeProviderAuditData = 8; SalesChannel SalesChannel = 9; string AgentId = 10; } The 'CutOffTime': message TimeSpan { sint64 value = 1; // the size of the timespan (in units of the selected scale) TimeSpanScale scale = 2; // the scale of the timespan [default = DAYS] enum TimeSpanScale { DAYS = 0; HOURS = 1; MINUTES = 2; SECONDS = 3; MILLISECONDS = 4; TICKS = 5; MINMAX = 15; // dubious } } Thanks, Joan. On Wednesday, September 20, 2023 at 10:40:08 AM UTC+2 Florian Enner wrote: > 1) A "varint" is a "variable length integer". When you replace a large > number with a small one, it's entirely possible to lose some bytes and > still be valid. You need to check the actual output. > > 2) Can you provide the proto definition of the field you want to modify? > Scalar fields get set to the last encountered value, so the easiest option > may be to copy the original bytes and append a delta containing the > differences. > > > > > On Wednesday, September 20, 2023 at 10:19:07 AM UTC+2 Joan Balagueró wrote: > >> Hello, >> >> I have a protobuf message like this into a byte array: >> >> 1: { // META element >> 1: 2 >> 2: 1 >> 3: 1 >> 4: { // CutOffTime element within META >> 1: 10 >> 2: 3 >> } >> 5: 1 >> 6: 40 >> } >> 2: 9836 // HOTEL element >> 3: 724 // MARKET element >> >> >> We need to traverse this message and write it to a 'CodeOutputStream', >> but changing the values of the 'cutoff' element to, for example to '4: { 1: >> 7, 2: 4 }'. I'm not able to do it, I need some help. >> >> A basic algorithm that writes the same protobuf to another byte array but >> without changing anything works. Here I try the special case of 'META' (key >> = 1) that contains the 'cutoff' element. >> >> Map<Integer, UnknownFieldSet.Field> rootFields = >> UnknownFieldSet.parseFrom(document).asMap(); >> >> for (Map.Entry<Integer, UnknownFieldSet.Field> entry : >> rootFields.entrySet()) { >> if (entry.getKey() == 1) { >> ByteString bs = >> entry.getValue().getLengthDelimitedList().get(0); >> output.writeByteArray(1, bs.toByteArray()); >> } >> else { >> entry.getValue().writeTo(entry.getKey(), output); >> } >> } >> >> >> Now I try to go a bit further, trying to read the cuotff element, change >> the values and rewrite them to the 'output'. And here is when I'm not able >> to solve the problem. Below my try that does not work, it generates a byte >> array >> of 69 bytes instead of 73 (I'm losing 4 bytes): >> >> Map<Integer, UnknownFieldSet.Field> rootFields = >> UnknownFieldSet.parseFrom(document).asMap(); >> >> for (Map.Entry<Integer, UnknownFieldSet.Field> entry : >> rootFields.entrySet()) { >> if (entry.getKey() == 1) { >> ByteString bs = >> entry.getValue().getLengthDelimitedList().get(0); >> Map<Integer, UnknownFieldSet.Field> ufs = >> UnknownFieldSet.parseFrom(bs).asMap(); >> >> for (Map.Entry<Integer, UnknownFieldSet.Field> item : >> ufs.entrySet()) { >> if (item.getKey() == 4) { >> Map<Integer, UnknownFieldSet.Field> cutoff = >> UnknownFieldSet.parseFrom(item.getValue().getLengthDelimitedList().get(0)).asMap(); >> cutoff.put(1, >> UnknownFieldSet.Field.newBuilder().addVarint(7).build()).writeTo(1, output); >> cutoff.put(2, >> UnknownFieldSet.Field.newBuilder().addVarint(4).build()).writeTo(1, output); >> } >> else { >> item.getValue().writeTo(item.getKey(), >> output); >> } >> } >> } >> else { >> entry.getValue().writeTo(entry.getKey(), output); >> } >> } >> >> Any help would be really appreciated. >> >> Thanks, >> >> Joan. >> > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. 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