#format #hex #display #debug


Formatting and shortening byte slices as hexadecimal strings

2 unstable releases

0.2.0 Oct 16, 2018
0.1.0 Oct 11, 2018

#79 in Debugging

Download history 14/week @ 2018-10-12 72/week @ 2018-10-19 64/week @ 2018-10-26

50 downloads per month
Used in 1 crate


168 lines

Formatting and shortening byte slices as hexadecimal strings

This crate provides wrappers for byte slices and lists of byte slices that implement the standard formatting traits and print the bytes as a hexadecimal string. It respects the alignment, width and precision parameters and applies padding and shortening.

let bytes: &[u8] = &[0x0a, 0x1b, 0x2c, 0x3d, 0x4e, 0x5f];

assert_eq!("0a1b2c3d4e5f", &format!("{}", HexFmt(bytes)));

// The default width is 10. Change it to apply padding or shortening.
assert_eq!("0a..5f", &format!("{:6}", HexFmt(bytes)));
assert_eq!("0a1b2c3d4e5f", &format!("{:12}", HexFmt(bytes)));
assert_eq!("  0a1b2c3d4e5f  ", &format!("{:16}", HexFmt(bytes)));

// The default alignment is centered. Use `<` or `>` to align left or right.
assert_eq!("0a1b..", &format!("{:<6}", HexFmt(bytes)));
assert_eq!("0a1b2c3d4e5f    ", &format!("{:<16}", HexFmt(bytes)));
assert_eq!("..4e5f", &format!("{:>6}", HexFmt(bytes)));
assert_eq!("    0a1b2c3d4e5f", &format!("{:>16}", HexFmt(bytes)));

// Use e.g. `4.8` to set the minimum width to 4 and the maximum to 8.
assert_eq!(" 12 ", &format!("{:4.8}", HexFmt([0x12])));
assert_eq!("123456", &format!("{:4.8}", HexFmt([0x12, 0x34, 0x56])));
assert_eq!("123..89a", &format!("{:4.8}", HexFmt([0x12, 0x34, 0x56, 0x78, 0x9a])));

// If you prefer uppercase, use `X`.
assert_eq!("0A1B..4E5F", &format!("{:X}", HexFmt(bytes)));

// All of the above can be combined.
assert_eq!("0A1B2C..", &format!("{:<4.8X}", HexFmt(bytes)));

// With `HexList`, the parameters are applied to each entry.
let list = &[[0x0a; 3], [0x1b; 3], [0x2c; 3]];
assert_eq!("[0A.., 1B.., 2C..]", &format!("{:<4X}", HexList(list)));

No runtime deps