/// <summary>
/// Checks to see if we're at the end of a sub-message (or message), and if so pops the processing stack
/// </summary>
/// <returns>True if we were at the end of a sub-message.</returns>
protected bool IsEndOfSubMessage()
{
Debug.Assert(processingStack.Count > 0);
MessageProcessingState processingState = processingStack.Peek();
if (processingState.Consumed >= processingState.MessageSize)
{
processingStack.Pop();
if (processingStack.Count > 0)
{
processingStack.Peek().Consumed += processingState.Consumed;
}
return(true);
}
return(false);
}
/**
*
*/
protected void ConsumeMessageEnvelope() //throws IOException
{
Debug.Assert(!eof);
CurrentElement = FudgeStreamElement.MessageStart;
if (bufferedByte.HasValue)
{
processingDirectives = bufferedByte.Value;
bufferedByte = null;
}
else
{
byte?nextByte = SafelyReadOneByte();
if (nextByte.HasValue)
{
processingDirectives = nextByte.Value;
}
else
{
// Hit the end of the stream
CurrentElement = FudgeStreamElement.NoElement;
eof = true;
return;
}
}
schemaVersion = Reader.ReadByte();
taxonomyId = Reader.ReadInt16();
envelopeSize = Reader.ReadInt32();
if (FudgeContext.TaxonomyResolver != null)
{
IFudgeTaxonomy taxonomy = FudgeContext.TaxonomyResolver.ResolveTaxonomy(taxonomyId);
this.taxonomy = taxonomy;
}
MessageProcessingState processingState = new MessageProcessingState();
processingState.Consumed = 8;
processingState.MessageSize = envelopeSize;
processingStack.Push(processingState);
}
/**
*
*/
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;
}
}
}
//throws IOException
/**
*
*/
protected void ConsumeMessageEnvelope()
{
Debug.Assert(!eof);
CurrentElement = FudgeStreamElement.MessageStart;
if (bufferedByte.HasValue)
{
processingDirectives = bufferedByte.Value;
bufferedByte = null;
}
else
{
byte? nextByte = SafelyReadOneByte();
if (nextByte.HasValue)
processingDirectives = nextByte.Value;
else
{
// Hit the end of the stream
CurrentElement = FudgeStreamElement.NoElement;
eof = true;
return;
}
}
schemaVersion = Reader.ReadByte();
taxonomyId = Reader.ReadInt16();
envelopeSize = Reader.ReadInt32();
if (FudgeContext.TaxonomyResolver != null)
{
IFudgeTaxonomy taxonomy = FudgeContext.TaxonomyResolver.ResolveTaxonomy(taxonomyId);
this.taxonomy = taxonomy;
}
MessageProcessingState processingState = new MessageProcessingState();
processingState.Consumed = 8;
processingState.MessageSize = envelopeSize;
processingStack.Push(processingState);
}
//throws IOException
/**
*
*/
protected void ConsumeFieldData()
{
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;
}
}
}
