public StringDecoder(int sizeQuota)
{
this.sizeQuota = sizeQuota;
this.sizeDecoder = new IntDecoder();
this.currentState = StringDecoder.State.ReadingSize;
this.Reset();
}
public int Decode(byte[] buffer, int offset, int size)
{
int num;
DecoderHelper.ValidateSize(size);
switch (this.currentState)
{
case StringDecoder.State.ReadingSize:
{
num = this.sizeDecoder.Decode(buffer, offset, size);
if (!this.sizeDecoder.IsValueDecoded)
{
break;
}
this.encodedSize = this.sizeDecoder.Value;
if (this.encodedSize > this.sizeQuota)
{
Exception exception = this.OnSizeQuotaExceeded(this.encodedSize);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(exception);
}
if (this.encodedBytes == null || (int)this.encodedBytes.Length < this.encodedSize)
{
this.encodedBytes = DiagnosticUtility.Utility.AllocateByteArray(this.encodedSize);
this.@value = null;
}
this.currentState = StringDecoder.State.ReadingBytes;
this.bytesNeeded = this.encodedSize;
break;
}
case StringDecoder.State.ReadingBytes:
{
if (this.@value == null || this.valueLengthInBytes != this.encodedSize || this.bytesNeeded != this.encodedSize || size < this.encodedSize || !StringDecoder.CompareBuffers(this.encodedBytes, buffer, offset))
{
num = this.bytesNeeded;
if (size < this.bytesNeeded)
{
num = size;
}
Buffer.BlockCopy(buffer, offset, this.encodedBytes, this.encodedSize - this.bytesNeeded, num);
StringDecoder stringDecoder = this;
stringDecoder.bytesNeeded = stringDecoder.bytesNeeded - num;
if (this.bytesNeeded != 0)
{
break;
}
this.@value = Encoding.UTF8.GetString(this.encodedBytes, 0, this.encodedSize);
this.valueLengthInBytes = this.encodedSize;
this.OnComplete(this.@value);
break;
}
else
{
num = this.bytesNeeded;
this.OnComplete(this.@value);
break;
}
}
default:
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataException(Microsoft.ServiceBus.SR.GetString(Resources.InvalidDecoderStateMachine, new object[0])));
}
}
return(num);
}
public void Reset()
{
this.currentState = StringDecoder.State.ReadingSize;
this.sizeDecoder.Reset();
}
protected virtual void OnComplete(string value)
{
this.currentState = StringDecoder.State.Done;
}