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