read_u64

Reads a u64 from bytes at offset, in the given byte order.

Import

use helpers4::bytes::read_u64;

Cargo feature bytes (enabled by default). To compile only this module:

cargo add helpers4 --no-default-features --features bytes

or in Cargo.toml:

[dependencies]
helpers4 = { version = "0.0.6", default-features = false, features = ["bytes"] }

Signature

pub fn read_u64(bytes: &[u8], offset: usize, endian: Endian) -> Option<u64>

Parameters

Parameter	Type	Description
bytes	&[u8]	The buffer to read from.
offset	usize	The index of the first byte to read.
endian	Endian	The byte order of the value in the buffer.

Returns

Option<u64> — The value, or None when fewer than 8 bytes remain at offset.

Examples

use helpers4::bytes::{read_u64, Endian};

let bytes = [0, 0, 0, 0, 0, 0, 1, 0];
assert_eq!(read_u64(&bytes, 0, Endian::Big), Some(256));
assert_eq!(read_u64(&bytes, 0, Endian::Little), Some(0x0001_0000_0000_0000));
assert_eq!(read_u64(&bytes, 1, Endian::Big), None);

Source

src/bytes/read_u64.rs