support bitwise operations on byte array

[rlespinasse]

Purpose

Support bitwise operations for a []byte value

• The length of 2 byte arrays can be different,
• The current endianness is little endian,
• Support for shift operations will be done by support left and right shift on byte array at a bit level #1.

Support

• AND
• OR
• XOR
• NOT

Function signatures

Bitwise AND

func Mask(data, mask []byte) []byte {}

Bitwise OR

func InclusiveMerge(data1, data2 []byte) []byte {}

Bitwise XOR

func ExclusiveMerge(data1, data2 []byte) []byte {}

Bitwise NOT

func Not(data []byte) []byte {}

[blockloop]

🤔 can you give me a function signature of what you expect here?

[blockloop]

To be clear, I know what those operators are. Just not sure what this PR means specifically.

[rlespinasse]

@blockloop Good question, I update the issue with more information.
Tell me if you need more.

Have fun

[m4-miranda]

@rlespinasse this is my first contribution, so excuse the (possibly) dumb questions.
How I'd implement the AND function: iterate through each byte in the array and perform an AND operation on each. Is this right or am I missing something?

[rlespinasse]

@m4-miranda It's basically that. Just take in account, this AND function must support different size for the data and mask parameters. The data and the mask must be considerate as Little endian (see Issue purpose sections.)

Have fun

[rlespinasse]

For everybody, you can implement this issue partially if you want.
Just tell me what you want to do, before.

[rlespinasse]

No forks since 5 days, so the issue is "partially" taken anymore

[ulziibuyan]

I would like to take this issue. Could you assign it to me, please?