Macro bytes

bytes!() { /* proc-macro */ }

Bytes converts literals into an array of bytes.

Currently supports only integer literals of unbounded size.

The following integer literal forms are supported and preserve leading zeros. The final byte representation always returns a consistent number of bytes given the number of digits inputed.

• Base 16 (hex)
• Base 2 (binary)

For integer literal forms that preserve leading zeros, zeros on the front of the number are preserved as zeros in the final bytes. For example: 0x0001 will produce [0, 1].

The following integer literal forms are supported and prohibit leading zeros. The number of bytes returned is not based off the number of digits entered.

• Base 10 (decimal)
• Base 8 (octal)

For integer literal forms that do not have consistent digit to byte lengths, the number of bytes returned is the minimum number of bytes required to represent the integer.

Examples

let bytes = bytes_lit::bytes!(1);
assert_eq!(bytes, [1]);

let bytes = bytes_lit::bytes!(9);
assert_eq!(bytes, [9]);

let bytes = bytes_lit::bytes!(0xfded3f55dec47250a52a8c0bb7038e72fa6ffaae33562f77cd2b629ef7fd424d);
assert_eq!(bytes, [
    253, 237, 63, 85, 222, 196, 114, 80, 165, 42, 140, 11, 183, 3, 142, 114,
    250, 111, 250, 174, 51, 86, 47, 119, 205, 43, 98, 158, 247, 253, 66, 77,
]);

let bytes = bytes_lit::bytes!(0x00000000dec47250a52a8c0bb7038e72fa6ffaae33562f77cd2b629ef7fd424d);
assert_eq!(bytes, [
    0, 0, 0, 0, 222, 196, 114, 80, 165, 42, 140, 11, 183, 3, 142, 114,
    250, 111, 250, 174, 51, 86, 47, 119, 205, 43, 98, 158, 247, 253, 66, 77,
]);