/// <summary>
/// As bytes...endian ness is taken care of in this method
/// </summary>
/// <param name="reserved">Not used now</param>
/// <returns>byte[]</returns>
public byte[] ToStream(UInt16 reserved)
{
if (this.SequenceNumber <= 0xF)
{
//single byte
byte[] retVal = new byte[1];
retVal[0] = (byte)this.SequenceNumber;
retVal[0] = (byte)(retVal[0] << 4); //seq number in top 4 bits
retVal[0] = (this.HasMoreBlocks) ? (byte)(retVal[0] | 0x08) : retVal[0]; //more flag in 5th bit
retVal[0] = (byte)(retVal[0] | this.SizeExponent); //size exponent, last 3 bits
return(retVal);
}
else if (this.SequenceNumber > 0xF && this.SequenceNumber <= 0xFFF)
{
//double byte
byte[] temp = new byte[2];
if (AbstractByteUtils.IsTargetLittleEndian())
{
temp = AbstractByteUtils.GetBytes((UInt16)(this._seqNumber << 4));
temp[0] = (this.HasMoreBlocks) ? (byte)(temp[0] | 0x08) : (byte)(temp[0] & 0xF7);
temp[0] = (byte)(temp[0] | this.SizeExponent);
}
else
{
temp = AbstractByteUtils.GetBytes((UInt16)(this._seqNumber >> 4));
temp[1] = (this.HasMoreBlocks) ? (byte)(temp[1] | 0x08) : (byte)(temp[1] & 0xF7);
temp[1] = (byte)(temp[1] | this.SizeExponent);
}
return(temp);
}
else
{
//3 bytes...we start with 4(long) and then return last 3 only
byte[] temp = new byte[4];
byte[] retVal = new byte[3];
if (AbstractByteUtils.IsTargetLittleEndian())
{
temp = AbstractByteUtils.GetBytes((UInt64)(this._seqNumber << 4));
temp[0] = (this.HasMoreBlocks) ? (byte)(temp[0] | 0x08) : (byte)(temp[0] & 0xF7);
temp[0] = (byte)(temp[0] | this.SizeExponent);
Array.Copy(temp, 0, retVal, 0, 3);
}
else
{
//use the index =2, index 3 will be discarded
temp = AbstractByteUtils.GetBytes((UInt64)(this._seqNumber >> 4));
temp[2] = (this.HasMoreBlocks) ? (byte)(temp[1] | 0x08) : (byte)(temp[1] & 0xF7);
temp[2] = (byte)(temp[1] | this.SizeExponent);
Array.Copy(temp, 1, retVal, 0, 3);
}
return(retVal);
}
}
/// <summary>
/// The byte array from which we need to construct this block option.
/// </summary>
/// <param name="data">
/// The byte array (max 3 bytes).Endian-ness is taken care of in this method
/// </param>
public CoAPBlockOption(byte[] data)
{
if (data == null || data.Length == 0 || data.Length > 3)
{
throw new ArgumentNullException("Block option byte array must be 1-3 bytes in length");
}
if (data.Length == 1 /*single byte*/)
{
this._seqNumber = (UInt16)(data[0] >> 4);
this._hasMore = (((data[0] & 0x08) >> 3) == 1) ? true : false;
this._sizeExp = (byte)(data[0] & 0x07);
}
else if (data.Length == 2 /*double byte*/)
{
if (AbstractByteUtils.IsTargetLittleEndian())
{
this._seqNumber = (UInt16)(AbstractByteUtils.ToUInt16(data) >> 4);
this._hasMore = (((data[0] & 0x08) >> 3) == 1) ? true : false;
this._sizeExp = (byte)(data[0] & 0x07);
}
else
{
this._seqNumber = (UInt16)(AbstractByteUtils.ToUInt16(data) << 4);
this._hasMore = (((data[1] & 0x08) >> 3) == 1) ? true : false;
this._sizeExp = (byte)(data[1] & 0x07);
}
}
else if (data.Length == 3 /*Triple byte*/)
{
if (AbstractByteUtils.IsTargetLittleEndian())
{
this._seqNumber = (UInt32)(AbstractByteUtils.ToUInt64(data) >> 4);
this._hasMore = (((data[0] & 0x08) >> 3) == 1) ? true : false;
this._sizeExp = (byte)(data[0] & 0x07);
}
else
{
this._seqNumber = (UInt32)(AbstractByteUtils.ToUInt64(data) << 4);
this._hasMore = (((data[2] & 0x08) >> 3) == 1) ? true : false;
this._sizeExp = (byte)(data[2] & 0x07);
}
}
}
