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use anyhow::Result as AnyResult;
use thiserror::Error as ThisError;
#[derive(Debug, ThisError)]
pub enum Error {
#[error("Fail to convert `{}` to bytes", hex_str)]
InvalidHexLength { hex_str: String },
}
#[macro_export]
macro_rules! bytes_array_unchecked {
($bytes:expr, $len:expr) => {{
unsafe { *($bytes.as_ptr() as *const [u8; $len]) }
}};
}
#[macro_export]
macro_rules! hex_str_array_unchecked {
($hex_str:expr, $len:expr) => {{
$crate::bytes_array_unchecked!($crate::bytes($hex_str)?, $len)
}};
}
pub fn bytes(hex_str: &str) -> AnyResult<Vec<u8>> {
if hex_str.len() % 2 != 0 {
Err(Error::InvalidHexLength {
hex_str: hex_str.into(),
})?;
}
let hex_str = hex_str.trim_start_matches("0x");
Ok((0..hex_str.len())
.step_by(2)
.map(|i| u8::from_str_radix(&hex_str[i..i + 2], 16).map_err(Into::into))
.collect::<AnyResult<Vec<_>>>()?)
}
pub fn hex_str(bytes: &[u8]) -> String {
bytes
.iter()
.map(|byte| format!("{:02x}", byte))
.collect::<Vec<_>>()
.join("")
}