reverse bytes function

[kbkpbot]

Describe the feature

Need some functions , that can reverse bytes in u128/u64/u32/u16
for example, reverse_u32(0x12345678)=0x78563412

Use Case

This can be used in some encryption/decryption algo.
sometimes , it need reverse a 128bits/64bits...

Proposed Solution

Integrate into encoding.binary?

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

V full version: V 0.4.6 6e8124f

Environment details (OS name and version, etc.)

V full version: V 0.4.6 6e8124f
OS: linux, Ubuntu 22.04.4 LTS
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz

getwd: /media/HD/github/lang/v/vlib/encoding/leb128
vexe: /media/HD/github/lang/v/v
vexe mtime: 2024-07-23 07:26:34

vroot: OK, value: /media/HD/github/lang/v
VMODULES: OK, value: /home/mars/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.34.1
Git vroot status: weekly.2024.30-3-g6e8124fd (1 commit(s) behind V master)
.git/config present: true

CC version: cc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
thirdparty/tcc status: thirdparty-linux-amd64 a0799a5b

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.

[felipensp]

See vlib/net/conv/conv.v

[kbkpbot]

See vlib/net/conv/conv.v

But these functions work depend on machine's endian.
Maybe we should add more functions there?

[JalonSolov]

It could be useful to have more generalized functions. Or one generic. Especially if you want the opposite byte order from what they handle (as you rightly point out, they only work based on the endianness of the current CPU).

Either way, the functions that are already there could work for what you want, if you're using the specific sizes they handle. They only do 16-bit, 32-bit, and 64-bit though... not 128.