64Bit Big Endian data from ushort array

Question

I have a ushort array which holds two array items inside command.Data[]. I am able to combine those two item values and get 32Bit Big Endian value as UInt32 with the following picece of code.

UInt32 param32BitValue= (UInt32)command.Data[0] << 32 | command.Data[1];

I have another parameter which holds 4 items inside ushort array and I want to combine those four values into ulong value like

(Illustration)

UInt64 param64BitValue= (UInt64)command.Data[0] << 64 | command.Data[1] << 64 | command.Data[2] << 64 | command.Data[3];

Big or little endian format. How do I achieve this?

Answer 1

Your first code snippet should actually shift by 16 bits, not 32, if command.Data really is a ushort[] array.

uint bigEndian32 = ((uint)command.Data[0] << 16) | command.Data[1];

For 64-bit, you'd just keep shifting left by 16 bits more each time:

ulong bigEndian64 = ((ulong)command.Data[0] << 48) | (command.Data[1] << 32) | (command.Data[2] << 16) | command.Data[3];