mirror of https://github.com/ctz/rustls
78 lines
2.8 KiB
Rust
78 lines
2.8 KiB
Rust
use std::fmt;
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/// Alternative implementation of `fmt::Debug` for byte slice.
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///
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/// Standard `Debug` implementation for `[u8]` is comma separated
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/// list of numbers. Since large amount of byte strings are in fact
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/// ASCII strings or contain a lot of ASCII strings (e. g. HTTP),
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/// it is convenient to print strings as ASCII when possible.
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///
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/// This struct wraps `&[u8]` just to override `fmt::Debug`.
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///
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/// `BsDebug` is not a part of public API of bytes crate.
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pub struct BsDebug<'a>(pub &'a [u8]);
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impl<'a> fmt::Debug for BsDebug<'a> {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(fmt, "b\"")?;
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for &c in self.0 {
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// https://doc.rust-lang.org/reference.html#byte-escapes
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if c == b'\n' {
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write!(fmt, "\\n")?;
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} else if c == b'\r' {
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write!(fmt, "\\r")?;
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} else if c == b'\t' {
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write!(fmt, "\\t")?;
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} else if c == b'\\' || c == b'"' {
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write!(fmt, "\\{}", c as char)?;
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} else if c == b'\0' {
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write!(fmt, "\\0")?;
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// ASCII printable
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} else if c >= 0x20 && c < 0x7f {
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write!(fmt, "{}", c as char)?;
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} else {
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write!(fmt, "\\x{:02x}", c)?;
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}
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}
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write!(fmt, "\"")?;
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Ok(())
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}
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}
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#[cfg(test)]
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mod test {
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use super::BsDebug;
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#[test]
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fn debug() {
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let vec: Vec<_> = (0..0x100).map(|b| b as u8).collect();
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let expected = "b\"\
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\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\
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\\x08\\t\\n\\x0b\\x0c\\r\\x0e\\x0f\
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\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\
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\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f\
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\x20!\\\"#$%&'()*+,-./0123456789:;<=>?\
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@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_\
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`abcdefghijklmnopqrstuvwxyz{|}~\\x7f\
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\\x80\\x81\\x82\\x83\\x84\\x85\\x86\\x87\
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\\x88\\x89\\x8a\\x8b\\x8c\\x8d\\x8e\\x8f\
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\\x90\\x91\\x92\\x93\\x94\\x95\\x96\\x97\
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\\x98\\x99\\x9a\\x9b\\x9c\\x9d\\x9e\\x9f\
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\\xa0\\xa1\\xa2\\xa3\\xa4\\xa5\\xa6\\xa7\
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\\xa8\\xa9\\xaa\\xab\\xac\\xad\\xae\\xaf\
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\\xb0\\xb1\\xb2\\xb3\\xb4\\xb5\\xb6\\xb7\
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\\xb8\\xb9\\xba\\xbb\\xbc\\xbd\\xbe\\xbf\
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\\xc0\\xc1\\xc2\\xc3\\xc4\\xc5\\xc6\\xc7\
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\\xc8\\xc9\\xca\\xcb\\xcc\\xcd\\xce\\xcf\
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\\xd0\\xd1\\xd2\\xd3\\xd4\\xd5\\xd6\\xd7\
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\\xd8\\xd9\\xda\\xdb\\xdc\\xdd\\xde\\xdf\
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\\xe0\\xe1\\xe2\\xe3\\xe4\\xe5\\xe6\\xe7\
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\\xe8\\xe9\\xea\\xeb\\xec\\xed\\xee\\xef\
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\\xf0\\xf1\\xf2\\xf3\\xf4\\xf5\\xf6\\xf7\
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\\xf8\\xf9\\xfa\\xfb\\xfc\\xfd\\xfe\\xff\"";
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assert_eq!(expected, format!("{:?}", BsDebug(&vec)));
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}
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}
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