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In preparation for adding separate errors move the hex code to its own private module.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // SPDX-License-Identifier: CC0-1.0 | ||
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| //! Conversion to and from hexadecimal strings. | ||
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| use core::str; | ||
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| /// Utility function used to parse hex into a target u8 buffer. Returns | ||
| /// the number of bytes converted or an error if it encounters an invalid | ||
| /// character or unexpected end of string. | ||
| pub(crate) fn from_hex(hex: &str, target: &mut [u8]) -> Result<usize, ()> { | ||
| if hex.len() % 2 == 1 || hex.len() > target.len() * 2 { | ||
| return Err(()); | ||
| } | ||
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| let mut b = 0; | ||
| let mut idx = 0; | ||
| for c in hex.bytes() { | ||
| b <<= 4; | ||
| match c { | ||
| b'A'..=b'F' => b |= c - b'A' + 10, | ||
| b'a'..=b'f' => b |= c - b'a' + 10, | ||
| b'0'..=b'9' => b |= c - b'0', | ||
| _ => return Err(()), | ||
| } | ||
| if (idx & 1) == 1 { | ||
| target[idx / 2] = b; | ||
| b = 0; | ||
| } | ||
| idx += 1; | ||
| } | ||
| Ok(idx / 2) | ||
| } | ||
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| /// Utility function used to encode hex into a target u8 buffer. Returns | ||
| /// a reference to the target buffer as an str. Returns an error if the target | ||
| /// buffer isn't big enough. | ||
| #[inline] | ||
| pub(crate) fn to_hex<'a>(src: &[u8], target: &'a mut [u8]) -> Result<&'a str, ()> { | ||
| let hex_len = src.len() * 2; | ||
| if target.len() < hex_len { | ||
| return Err(()); | ||
| } | ||
| const HEX_TABLE: [u8; 16] = *b"0123456789abcdef"; | ||
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| let mut i = 0; | ||
| for &b in src { | ||
| target[i] = HEX_TABLE[usize::from(b >> 4)]; | ||
| target[i + 1] = HEX_TABLE[usize::from(b & 0b00001111)]; | ||
| i += 2; | ||
| } | ||
| let result = &target[..hex_len]; | ||
| debug_assert!(str::from_utf8(result).is_ok()); | ||
| return unsafe { Ok(str::from_utf8_unchecked(result)) }; | ||
| } |
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