1use crate::ParseError;
2
3pub fn take<const N: usize>(input: &[u8]) -> Result<(&[u8], [u8; N]), ParseError> {
4 if let (Some(value: &[u8]), Some(rest: &[u8])) = (input.get(index:0..N), input.get(N..)) {
5 Ok((rest, value.try_into().unwrap()))
6 } else {
7 Err(ParseError::UnexpectedEndOfFile)
8 }
9}
10
11pub fn take_slice(input: &[u8], length: usize) -> Result<(&[u8], &[u8]), ParseError> {
12 if let (Some(value: &[u8]), Some(rest: &[u8])) = (input.get(index:0..length), input.get(index:length..)) {
13 Ok((rest, value))
14 } else {
15 Err(ParseError::UnexpectedEndOfFile)
16 }
17}
18
19pub fn le_u16(input: &[u8]) -> Result<(&[u8], u16), ParseError> {
20 let (input: &[u8], value: [u8; 2]) = take::<2>(input)?;
21 Ok((input, u16::from_le_bytes(value)))
22}
23
24pub fn le_u32(input: &[u8]) -> Result<(&[u8], u32), ParseError> {
25 let (input: &[u8], value: [u8; 4]) = take::<4>(input)?;
26 Ok((input, u32::from_le_bytes(value)))
27}
28
29pub fn le_i32(input: &[u8]) -> Result<(&[u8], i32), ParseError> {
30 le_u32(input).map(|(input: &[u8], value: u32)| (input, value as i32))
31}
32