C# 클래스 Tx.Network.PacketParser

For many of the operations in this class a set of bits less than one (1) byte is needed. Bitwise operators and masks are needed to extract those bit values (0 or 1) from a byte. All data from the network is received as Big-Endian.Windows is Little-Endian. You can validate this with BitConverter.IsLittleEndian Any sequence of bytes greater than 1 from the network has the most-significant byte at the LAST (aka End) position in the sequence. Network bytes are ALWAYS Big-Endian. To do the "right thing" in Windows'-little-endian-world: - A SINGULAR byte does not require any changes - A CHARACTER array (aka string) or other Byte-Array requires no changes -- ASCII works this way. -- Other encodings may vary so look up the rules. - Any NUMBER comprised of more than 1 byte from the Network is Big-Endian -- Therefore to make it work in Windows Network-to-Host-Order must be performed. -- All numbers are even multiples of a byte ( greater than 1) -- For example: | Network bytes will appear as [Ox80, 0x56] == 32854 (if cast to Int16 this will be a negative number) | NTHO in Windows will provide[0x56, 0x80] == 22144 Please refer to the usage of -System.Net.IPAddress.NetworkToHostOrder(). -- NOTE this operates on SIGNED Integers(16,32,64) only. -- All Internet header numbers are UNSIGNED Integers(16,32,64) so this makes no sense to me. - System.BitConverter.ToInt16() or .ToInt32() Typically the implementation would look like this: - (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, 2)); - At zero-based-index 2 for (byte[])buffer of arbitrary size > 5 bytes - Return type is SHORT so a cast to USHORT is required while inside Internet Headers. !!! !WARNING: the Bytes in an IP-Address (v4 or v6) are READ as a Byte-Array and not a Number! !NToH Should not be used on Addresses! !!!