32 lines
1.0 KiB
Rust
32 lines
1.0 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::fmt;
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// Provide some more formatting options for some data types (at the moment
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// that's just `{:x}` for slices of u8).
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pub struct FmtWrap<T>(pub T);
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impl<'a> fmt::LowerHex for FmtWrap<&'a [u8]> {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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for byte in self.0.iter() {
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try!(write!(formatter, "{:02x}", byte));
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}
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Ok(())
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}
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}
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#[test]
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fn test_lower_hex() {
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let bytes: &[u8] = &[0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef];
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assert_eq!("0123456789abcdef", &format!("{:x}", FmtWrap(bytes)));
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}
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