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cksum/hashsum: Move the algo mgmt into a dedicated function

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This commit is contained in:
Sylvestre Ledru 2024-06-04 19:13:54 +02:00
parent 520907e22b
commit e7898ab32a
1 changed files with 61 additions and 50 deletions
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111
src/uucore/src/lib/features/checksum.rs
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@ -414,11 +414,63 @@ fn get_input_file(filename_input: &OsStr, input_is_stdin: bool) -> UResult<Box<d
}
}
/// Extracts the algorithm name and length from the regex captures if the algo-based format is matched.
fn get_algo_name_and_length(
caps: &regex::Captures,
is_algo_based_format: bool,
algo_name_input: Option<&str>,
length_input: Option<usize>,
res: &mut ChecksumResult,
) -> (String, Option<usize>) {
if is_algo_based_format {
// When the algo-based format is matched, extract details from regex captures
let algorithm = caps.name("algo").map_or("", |m| m.as_str()).to_lowercase();
// check if we are called with XXXsum (example: md5sum) but we detected a different algo parsing the file
// (for example SHA1 (f) = d...)
// Also handle the case cksum -s sm3 but the file contains other formats
if algo_name_input.is_some() && algo_name_input != Some(&algorithm) {
res.bad_format += 1;
res.properly_formatted = false;
return (String::new(), None);
}
if !SUPPORTED_ALGORITHMS.contains(&algorithm.as_str()) {
// Not supported algo, leave early
res.properly_formatted = false;
return (String::new(), None);
}
let bits = caps.name("bits").map_or(Some(None), |m| {
let bits_value = m.as_str().parse::<usize>().unwrap();
if bits_value % 8 == 0 {
Some(Some(bits_value / 8))
} else {
res.properly_formatted = false;
None // Return None to signal a divisibility issue
}
});
if bits.is_none() {
// If bits is None, we have a parsing or divisibility issue
// Exit the loop outside of the closure
return (String::new(), None);
}
(algorithm, bits.unwrap())
} else if let Some(a) = algo_name_input {
// When a specific algorithm name is input, use it and use the provided bits
(a.to_lowercase(), length_input)
} else {
// Default case if no algorithm is specified and non-algo based format is matched
(String::new(), None)
}
}
/***
* Do the checksum validation (can be strict or not)
*/
#[allow(clippy::too_many_arguments)]
#[allow(clippy::cognitive_complexity)]
pub fn perform_checksum_validation<'a, I>(
files: I,
strict: bool,
@ -465,58 +517,17 @@ where
}
let expected_checksum =
get_expected_checksum(&filename_to_check, &caps, &chosen_regex)?;
get_expected_checksum(filename_to_check, &caps, &chosen_regex)?;
// If the algo_name is provided, we use it, otherwise we try to detect it
let (algo_name, length) = if is_algo_based_format {
// When the algo-based format is matched, extract details from regex captures
let algorithm = caps.name("algo").map_or("", |m| m.as_str()).to_lowercase();
// check if we are called with XXXsum (example: md5sum) but we detected a different algo parsing the file
// (for example SHA1 (f) = d...)
// Also handle the case cksum -s sm3 but the file contains other formats
if algo_name_input.is_some() && algo_name_input != Some(&algorithm) {
res.bad_format += 1;
res.properly_formatted = false;
continue;
}
if !SUPPORTED_ALGORITHMS.contains(&algorithm.as_str()) {
// Not supported algo, leave early
res.properly_formatted = false;
continue;
}
let bits = caps.name("bits").map_or(Some(None), |m| {
let bits_value = m.as_str().parse::<usize>().unwrap();
if bits_value % 8 == 0 {
Some(Some(bits_value / 8))
} else {
res.properly_formatted = false;
None // Return None to signal a divisibility issue
}
});
if bits.is_none() {
// If bits is None, we have a parsing or divisibility issue
// Exit the loop outside of the closure
continue;
}
(algorithm, bits.unwrap())
} else if let Some(a) = algo_name_input {
// When a specific algorithm name is input, use it and use the provided bits
(a.to_lowercase(), length_input)
} else {
// Default case if no algorithm is specified and non-algo based format is matched
(String::new(), None)
};
if is_algo_based_format && algo_name_input.map_or(false, |input| algo_name != input)
{
res.bad_format += 1;
continue;
}
let (algo_name, length) = get_algo_name_and_length(
&caps,
is_algo_based_format,
algo_name_input,
length_input,
&mut res,
);
if algo_name.is_empty() {
// we haven't been able to detect the algo name. No point to continue