/// <summary>
/// Decodes the specified region of the buffer into an unadjusted frame length. The default implementation is
/// capable of decoding the specified region into an unsigned 8/16/24/32/64 bit integer. Override this method to
/// decode the length field encoded differently.
/// Note that this method must not modify the state of the specified buffer (e.g.
/// <see cref="IByteBuffer.ReaderIndex" />,
/// <see cref="IByteBuffer.WriterIndex" />, and the content of the buffer.)
/// </summary>
/// <param name="buffer">The buffer we'll be extracting the frame length from.</param>
/// <param name="offset">The offset from the absolute <see cref="IByteBuffer.ReaderIndex" />.</param>
/// <param name="length">The length of the framelenght field. Expected: 1, 2, 3, 4, or 8.</param>
/// <param name="order">The preferred <see cref="ByteOrder" /> of buffer.</param>
/// <returns>A long integer that represents the unadjusted length of the next frame.</returns>
protected virtual long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
long frameLength;
switch (length)
{
case 1:
frameLength = buffer.GetByte(offset);
break;
case 2:
frameLength = order == ByteOrder.BigEndian ? buffer.GetUnsignedShort(offset) : buffer.GetUnsignedShortLE(offset);
break;
case 3:
frameLength = order == ByteOrder.BigEndian ? buffer.GetUnsignedMedium(offset) : buffer.GetUnsignedMediumLE(offset);
break;
case 4:
frameLength = order == ByteOrder.BigEndian ? buffer.GetInt(offset) : buffer.GetIntLE(offset);
break;
case 8:
frameLength = order == ByteOrder.BigEndian ? buffer.GetLong(offset) : buffer.GetLongLE(offset);
break;
default:
throw new DecoderException("unsupported lengthFieldLength: " + this.lengthFieldLength + " (expected: 1, 2, 3, 4, or 8)");
}
return(frameLength);
}
/// <summary>
/// Decodes the specified region of the buffer into an unadjusted frame length. The default implementation is
/// capable of decoding the specified region into an unsigned 8/16/24/32/64 bit integer. Override this method to
/// decode the length field encoded differently.
/// Note that this method must not modify the state of the specified buffer (e.g.
/// <see cref="IByteBuffer.ReaderIndex" />,
/// <see cref="IByteBuffer.WriterIndex" />, and the content of the buffer.)
/// </summary>
/// <param name="buffer">The buffer we'll be extracting the frame length from.</param>
/// <param name="offset">The offset from the absolute <see cref="IByteBuffer.ReaderIndex" />.</param>
/// <param name="length">The length of the framelenght field. Expected: 1, 2, 3, 4, or 8.</param>
/// <param name="order">The preferred <see cref="ByteOrder" /> of buffer.</param>
/// <returns>A long integer that represents the unadjusted length of the next frame.</returns>
protected long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
long frameLength;
switch (length)
{
case 1:
frameLength = buffer.GetByte(offset);
break;
case 2:
frameLength = order == ByteOrder.BigEndian ? buffer.GetUnsignedShort(offset) : buffer.GetUnsignedShortLE(offset);
break;
case 3:
frameLength = order == ByteOrder.BigEndian ? buffer.GetUnsignedMedium(offset) : buffer.GetUnsignedMediumLE(offset);
break;
case 4:
frameLength = order == ByteOrder.BigEndian ? buffer.GetInt(offset) : buffer.GetIntLE(offset);
break;
case 8:
frameLength = order == ByteOrder.BigEndian ? buffer.GetLong(offset) : buffer.GetLongLE(offset);
break;
default:
throw new DecoderException("unsupported lengthFieldLength: " + this.lengthFieldLength + " (expected: 1, 2, 3, 4, or 8)");
}
byte[] bytes = BitConverter.GetBytes(frameLength);
string slength = Encoding.UTF8.GetString(bytes);
frameLength = long.Parse(slength);
return(frameLength);
}
/// <summary>
/// Decodes the specified region of the buffer into an unadjusted frame length. The default implementation is
/// capable of decoding the specified region into an unsigned 8/16/24/32/64 bit integer. Override this method to
/// decode the length field encoded differently.
/// Note that this method must not modify the state of the specified buffer (e.g.
/// <see cref="IByteBuffer.ReaderIndex" />,
/// <see cref="IByteBuffer.WriterIndex" />, and the content of the buffer.)
/// </summary>
/// <param name="buffer">The buffer we'll be extracting the frame length from.</param>
/// <param name="offset">The offset from the absolute <see cref="IByteBuffer.ReaderIndex" />.</param>
/// <param name="length">The length of the framelenght field. Expected: 1, 2, 3, 4, or 8.</param>
/// <param name="order">The preferred <see cref="ByteOrder" /> of buffer.</param>
/// <returns>A long integer that represents the unadjusted length of the next frame.</returns>
protected static long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
return(length switch
{
1 => buffer.GetByte(offset),
2 => order == ByteOrder.BigEndian ? buffer.GetUnsignedShort(offset) : buffer.GetUnsignedShortLE(offset),
3 => order == ByteOrder.BigEndian ? buffer.GetUnsignedMedium(offset) : buffer.GetUnsignedMediumLE(offset),
4 => order == ByteOrder.BigEndian ? buffer.GetInt(offset) : buffer.GetIntLE(offset),
8 => order == ByteOrder.BigEndian ? buffer.GetLong(offset) : buffer.GetLongLE(offset),
_ => CThrowHelper.ThrowDecoderException(length),
});
