/// <inheritdoc/>
public void EndSubMessage()
{
long currentPos = memStream.Position;
var state = stack.Pop();
int size = state.FinalMessageContentsSize;
// Overwrite the prefix now we know the size
int newFieldPrefix = FudgeFieldPrefixCodec.ComposeFieldPrefix(false, size, state.HasOrdinal, state.HasName);
memStream.Position = state.PrefixPos;
memWriter.Write((byte)newFieldPrefix);
// Write the size into the four bytes we reserved earlier
memStream.Position = state.SizePos;
memWriter.Write(state.FinalMessageContentsSize);
// Skip back to the end
memStream.Position = currentPos;
// Add this message's size to the parent message's total final size
int sizeSize = FudgeFieldPrefixCodec.CalculateVarSizeSize(size);
int totalMessageSize = state.FinalMessageContentsSize + state.HeaderSize + sizeSize; // Although we took four bytes writing the size we won't when it's finally output
stack.Peek().FinalMessageContentsSize += totalMessageSize;
}
private static int WriteFieldHeader(BinaryWriter bw, int valueSize, bool variableSize, int typeId, short?ordinal, string name)
{
int nWritten = 0;
int fieldPrefix = FudgeFieldPrefixCodec.ComposeFieldPrefix(!variableSize, valueSize, (ordinal != null), (name != null));
bw.Write((byte)fieldPrefix);
nWritten++;
bw.Write((byte)typeId);
nWritten++;
if (ordinal != null)
{
bw.Write(ordinal.Value);
nWritten += 2;
}
if (name != null)
{
int utf8size = StringFieldType.Encoding.GetByteCount(name);
if (utf8size > 0xFF)
{
throw new ArgumentOutOfRangeException("UTF-8 encoded field name cannot exceed 255 characters. Name \"" + name + "\" is " + utf8size + " bytes encoded.");
}
bw.Write((byte)utf8size);
nWritten++;
nWritten += StringFieldType.WriteString(bw, name);
}
return(nWritten);
}
public void FieldPrefixComposition()
{
Assert.Equal(0x20, FudgeFieldPrefixCodec.ComposeFieldPrefix(false, 10, false, false));
Assert.Equal(0x40, FudgeFieldPrefixCodec.ComposeFieldPrefix(false, 1024, false, false));
Assert.Equal(0x60, FudgeFieldPrefixCodec.ComposeFieldPrefix(false, short.MaxValue + 1000, false, false));
Assert.Equal(0x98, FudgeFieldPrefixCodec.ComposeFieldPrefix(true, 0, true, true));
}