/// <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 varWidthSizeChecks()
{
Assert.Equal(0, FudgeFieldPrefixCodec.GetFieldWidthByteCount(0x98));
Assert.Equal(1, FudgeFieldPrefixCodec.GetFieldWidthByteCount(0x20));
Assert.Equal(2, FudgeFieldPrefixCodec.GetFieldWidthByteCount(0x40));
Assert.Equal(4, FudgeFieldPrefixCodec.GetFieldWidthByteCount(0x60));
}
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));
}
/**
*
*/
protected void ConsumeFieldData() //throws IOException
{
sbyte fieldPrefix = Reader.ReadSByte();
int typeId = Reader.ReadByte();
int nRead = 2;
bool fixedWidth = FudgeFieldPrefixCodec.IsFixedWidth(fieldPrefix);
bool hasOrdinal = FudgeFieldPrefixCodec.HasOrdinal(fieldPrefix);
bool hasName = FudgeFieldPrefixCodec.HasName(fieldPrefix);
int?ordinal = null;
if (hasOrdinal)
{
ordinal = Reader.ReadInt16();
nRead += 2;
}
string name = null;
if (hasName)
{
int nameSize = Reader.ReadByte();
nRead++;
name = StringFieldType.ReadString(Reader, nameSize);
nRead += nameSize;
}
else if (ordinal != null)
{
if (Taxonomy != null)
{
name = Taxonomy.GetFieldName((short)ordinal.Value);
}
}
FudgeFieldType type = FudgeContext.TypeDictionary.GetByTypeId(typeId);
if (type == null)
{
if (fixedWidth)
{
throw new FudgeRuntimeException("Unknown fixed width type " + typeId + " for field " + ordinal + ":" + name + " cannot be handled.");
}
type = FudgeContext.TypeDictionary.GetUnknownType(typeId);
}
int varSize = 0;
if (!fixedWidth)
{
int varSizeBytes = FudgeFieldPrefixCodec.GetFieldWidthByteCount(fieldPrefix);
switch (varSizeBytes)
{
case 0: varSize = 0; break;
case 1: varSize = Reader.ReadByte(); nRead += 1; break;
case 2: varSize = Reader.ReadInt16(); nRead += 2; break;
case 4: varSize = Reader.ReadInt32(); nRead += 4; break;
default:
throw new FudgeRuntimeException("Illegal number of bytes indicated for variable width encoding: " + varSizeBytes);
}
}
FieldName = name;
FieldOrdinal = ordinal;
FieldType = type;
MessageProcessingState currMsgProcessingState = processingStack.Peek();
currMsgProcessingState.Consumed += nRead;
if (typeId == FudgeTypeDictionary.FUDGE_MSG_TYPE_ID)
{
CurrentElement = FudgeStreamElement.SubmessageFieldStart;
FieldValue = null;
MessageProcessingState subState = new MessageProcessingState();
subState.MessageSize = varSize;
subState.Consumed = 0;
processingStack.Push(subState);
}
else
{
CurrentElement = FudgeStreamElement.SimpleField;
FieldValue = ReadFieldValue(Reader, FieldType, varSize);
if (fixedWidth)
{
currMsgProcessingState.Consumed += type.FixedSize;
}
else
{
currMsgProcessingState.Consumed += varSize;
}
}
}
public void hasOrdinalChecks()
{
Assert.False(FudgeFieldPrefixCodec.HasOrdinal(0x20));
Assert.True(FudgeFieldPrefixCodec.HasOrdinal(0x98));
}
public void fixedWidthChecks()
{
Assert.False(FudgeFieldPrefixCodec.IsFixedWidth(0x20));
Assert.True(FudgeFieldPrefixCodec.IsFixedWidth(0x98));
}
public void HasNameChecks()
{
Assert.False(FudgeFieldPrefixCodec.HasName(0x20));
Assert.True(FudgeFieldPrefixCodec.HasName(0x98));
}
