/// <summary>
/// ReadByteStuffedByte is like ReadByte but is for byte-stuffed Huffman data.
/// </summary>
/// <param name="inputStream">Input stream</param>
/// <param name="errorCode">Error code</param>
/// <returns>The <see cref="byte"/></returns>
internal byte ReadByteStuffedByte(Stream inputStream, out JpegDecoderCore.ErrorCodes errorCode)
{
byte x;
errorCode = JpegDecoderCore.ErrorCodes.NoError;
// Take the fast path if bytes.buf contains at least two bytes.
if (this.I + 2 <= this.J)
{
x = this.Buffer[this.I];
this.I++;
this.UnreadableBytes = 1;
if (x != JpegConstants.Markers.XFF)
{
return(x);
}
if (this.Buffer[this.I] != 0x00)
{
errorCode = JpegDecoderCore.ErrorCodes.MissingFF00;
return(0);
// throw new MissingFF00Exception();
}
this.I++;
this.UnreadableBytes = 2;
return(JpegConstants.Markers.XFF);
}
this.UnreadableBytes = 0;
x = this.ReadByte(inputStream);
this.UnreadableBytes = 1;
if (x != JpegConstants.Markers.XFF)
{
return(x);
}
x = this.ReadByte(inputStream);
this.UnreadableBytes = 2;
if (x != 0x00)
{
errorCode = JpegDecoderCore.ErrorCodes.MissingFF00;
return(0);
// throw new MissingFF00Exception();
}
return(JpegConstants.Markers.XFF);
}
/// <summary>
/// Receive extend
/// </summary>
/// <param name="t">Byte</param>
/// <param name="decoder">Jpeg decoder</param>
/// <returns>Read bits value</returns>
internal int ReceiveExtend(byte t, JpegDecoderCore decoder)
{
if (this.UnreadBits < t)
{
JpegDecoderCore.ErrorCodes errorCode = this.EnsureNBits(t, decoder);
if (errorCode != JpegDecoderCore.ErrorCodes.NoError)
{
throw new JpegDecoderCore.MissingFF00Exception();
}
}
this.UnreadBits -= t;
this.Mask >>= t;
int s = 1 << t;
int x = (int)((this.Accumulator >> this.UnreadBits) & (s - 1));
if (x < (s >> 1))
{
x += ((-1) << t) + 1;
}
return(x);
}
){kind=link}