public ServerSingletonSizedDecoder(int maxViaLength, int maxContentTypeLength)
{
viaDecoder = new ViaStringDecoder(maxViaLength);
contentTypeDecoder = new ContentTypeStringDecoder(maxContentTypeLength);
currentState = State.ReadingViaRecord;
}
public override int Decode(ReadOnlySequence <byte> buffer)
{
DecoderHelper.ValidateSize(buffer.Length);
var data = buffer.First.Span;
try
{
int bytesConsumed;
FramingRecordType recordType;
switch (currentState)
{
case State.ReadingViaRecord:
recordType = (FramingRecordType)data[0];
ValidateRecordType(FramingRecordType.Via, recordType);
bytesConsumed = 1;
viaDecoder.Reset();
currentState = State.ReadingViaString;
break;
case State.ReadingViaString:
bytesConsumed = viaDecoder.Decode(buffer);
if (viaDecoder.IsValueDecoded)
{
currentState = State.ReadingContentTypeRecord;
}
break;
case State.ReadingContentTypeRecord:
recordType = (FramingRecordType)data[0];
if (recordType == FramingRecordType.KnownEncoding)
{
bytesConsumed = 1;
currentState = State.ReadingContentTypeByte;
}
else
{
ValidateRecordType(FramingRecordType.ExtensibleEncoding, recordType);
bytesConsumed = 1;
contentTypeDecoder.Reset();
currentState = State.ReadingContentTypeString;
}
break;
case State.ReadingContentTypeByte:
contentType = ContentTypeStringDecoder.GetString((FramingEncodingType)data[0]);
bytesConsumed = 1;
currentState = State.PreUpgradeStart;
break;
case State.ReadingContentTypeString:
bytesConsumed = contentTypeDecoder.Decode(buffer);
if (contentTypeDecoder.IsValueDecoded)
{
currentState = State.PreUpgradeStart;
contentType = contentTypeDecoder.Value;
}
break;
case State.PreUpgradeStart:
bytesConsumed = 0;
currentState = State.ReadingUpgradeRecord;
break;
case State.ReadingUpgradeRecord:
recordType = (FramingRecordType)data[0];
if (recordType == FramingRecordType.UpgradeRequest)
{
bytesConsumed = 1;
contentTypeDecoder.Reset();
currentState = State.ReadingUpgradeString;
}
else
{
bytesConsumed = 0;
currentState = State.ReadingPreambleEndRecord;
}
break;
case State.ReadingUpgradeString:
bytesConsumed = contentTypeDecoder.Decode(buffer);
if (contentTypeDecoder.IsValueDecoded)
{
currentState = State.UpgradeRequest;
upgrade = contentTypeDecoder.Value;
}
break;
case State.UpgradeRequest:
bytesConsumed = 0;
currentState = State.ReadingUpgradeRecord;
break;
case State.ReadingPreambleEndRecord:
recordType = (FramingRecordType)data[0];
ValidateRecordType(FramingRecordType.PreambleEnd, recordType);
bytesConsumed = 1;
currentState = State.Start;
break;
case State.Start:
bytesConsumed = 0;
currentState = State.ReadingEndRecord;
break;
case State.ReadingEndRecord:
recordType = (FramingRecordType)data[0];
if (recordType == FramingRecordType.End)
{
bytesConsumed = 1;
currentState = State.End;
}
else
{
bytesConsumed = 0;
currentState = State.ReadingEnvelopeRecord;
}
break;
case State.ReadingEnvelopeRecord:
ValidateRecordType(FramingRecordType.SizedEnvelope, (FramingRecordType)data[0]);
bytesConsumed = 1;
currentState = State.ReadingEnvelopeSize;
sizeDecoder.Reset();
break;
case State.ReadingEnvelopeSize:
bytesConsumed = sizeDecoder.Decode(buffer);
if (sizeDecoder.IsValueDecoded)
{
currentState = State.EnvelopeStart;
envelopeSize = sizeDecoder.Value;
envelopeBytesNeeded = envelopeSize;
}
break;
case State.EnvelopeStart:
bytesConsumed = 0;
currentState = State.ReadingEnvelopeBytes;
break;
case State.ReadingEnvelopeBytes:
bytesConsumed = (int)buffer.Length;
if (bytesConsumed > envelopeBytesNeeded)
{
bytesConsumed = envelopeBytesNeeded;
}
envelopeBytesNeeded -= bytesConsumed;
if (envelopeBytesNeeded == 0)
{
currentState = State.EnvelopeEnd;
}
break;
case State.EnvelopeEnd:
bytesConsumed = 0;
currentState = State.ReadingEndRecord;
break;
case State.End:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
CreateException(new InvalidDataException(SR.FramingAtEnd)));
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
CreateException(new InvalidDataException(SR.InvalidDecoderStateMachine)));
}
return(bytesConsumed);
}
catch (InvalidDataException e)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreateException(e));
}
}
public ServerSingletonDecoder(int maxViaLength, int maxContentTypeLength)
{
viaDecoder = new ViaStringDecoder(maxViaLength);
contentTypeDecoder = new ContentTypeStringDecoder(maxContentTypeLength);
Reset();
}