Macro nom::u32

macro_rules! u32 {
    ($i:expr, $e:expr) => { ... };
}

if the parameter is nom::Endianness::Big, parse a big endian u32 integer, otherwise a little endian u32 integer

use nom::number::Endianness;

named!(be<u32>, u32!(Endianness::Big));

assert_eq!(be(b"\x00\x01\x02\x03abcd"), Ok((&b"abcd"[..], 0x00010203)));
assert_eq!(be(b"\x01"), Err(Err::Incomplete(Needed::Size(4))));

named!(le<u32>, u32!(Endianness::Little));

assert_eq!(le(b"\x00\x01\x02\x03abcd"), Ok((&b"abcd"[..], 0x03020100)));
assert_eq!(le(b"\x01"), Err(Err::Incomplete(Needed::Size(4))));