# Function nom::number::complete::u32

source · [−]

    pub fn u32<I, E: ParseError<I>>(
        endian: Endianness
    ) -> fn(_: I) -> IResult<I, u32, E> where
        I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,

Expand description

Recognizes an unsigned 4 byte integer

If the parameter is `nom::number::Endianness::Big`, parse a big endian u32 integer, otherwise if `nom::number::Endianness::Little` parse a little endian u32 integer. complete version: returns an error if there is not enough input data

    use nom::number::complete::u32;

    let be_u32 = |s| {
      u32(nom::number::Endianness::Big)(s)
    };

    assert_eq!(be_u32(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x00030507)));
    assert_eq!(be_u32(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));

    let le_u32 = |s| {
      u32(nom::number::Endianness::Little)(s)
    };

    assert_eq!(le_u32(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x07050300)));
    assert_eq!(le_u32(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));