40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
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use anyhow::{anyhow, Result};
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use log::debug;
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pub fn get_nth_bit(byte: u8, n: u8) -> bool {
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((byte & (0b1 << n)) >> n) != 0
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}
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pub fn byte_to_bitarray(byte: u8) -> [bool; 8] {
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let mut bitarray = [false; 8];
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for (i, bit) in bitarray.iter_mut().enumerate() {
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*bit = get_nth_bit(byte, i as u8);
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}
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bitarray
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}
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pub fn offset_length_to_start_end(offset: usize, length: usize) -> (usize, usize) {
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(offset, offset + length)
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}
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// This probably isn’t the right way to do this, but after countless attempts to implement
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// error conversion (IResult to anyhow::Result) it was the only thing I could come up with.
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pub fn exec_nom_parser<'a, F, R>(func: F, input: &'a [u8]) -> Result<R>
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where
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F: Fn(&'a [u8]) -> nom::IResult<&[u8], R>,
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{
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match func(input) {
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Ok((unprocessed, result)) => {
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if !unprocessed.is_empty() {
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debug!(
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"Parser returned {} bytes of unprocessed input: {:?}",
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unprocessed.len(),
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unprocessed
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);
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}
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Ok(result)
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}
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Err(error) => Err(anyhow!("Nom returned error: {}", error)),
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}
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}
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