falco_event/types/format/
bytebuf.rs

1use std::fmt::{Debug, Formatter, Write};
2
3/// Falco-style byte buffer formatter
4///
5/// The default [`Debug`] impl prints out the buffer as an ASCII string, replacing non-printable
6/// characters with dots (`.`).
7///
8/// The hex debug implementation (`{:x?}`) generates a hex dump of the whole buffer.
9pub struct ByteBufFormatter<'a>(pub &'a [u8]);
10
11impl Debug for ByteBufFormatter<'_> {
12    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
13        // https://users.rust-lang.org/t/idiomatic-to-implement-the-debug-trait-for-x-syntax/84955
14        #[allow(deprecated)]
15        if f.flags() & 16 != 0 {
16            let mut first = true;
17            for c in self.0 {
18                if first {
19                    first = false;
20                } else {
21                    write!(f, " ")?;
22                }
23                write!(f, "{:02x}", *c)?;
24            }
25        } else {
26            for c in self.0 {
27                let c = *c;
28                if !(b' '..=0x7e).contains(&c) {
29                    f.write_char('.')?;
30                } else {
31                    f.write_char(c as char)?;
32                }
33            }
34        }
35
36        Ok(())
37    }
38}
falco_event/types/format/bytebuf.rs

falco_event/types/format/
bytebuf.rs
