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perf(punycode): avoid double allocation in decode_to_string #894

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merged 2 commits into from
Jan 10, 2024
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perf(punycode): avoid double allocation in decode_to_string #894

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d318128
perf(punycode): avoid double allocation in decode_to_string
bishopcheckmate Jan 8, 2024
a5ff8fa
include decode_to_string in tests
bishopcheckmate Jan 9, 2024
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6 changes: 4 additions & 2 deletions idna/src/punycode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,12 @@ fn adapt(mut delta: u32, num_points: u32, first_time: bool) -> u32 {

/// Convert Punycode to an Unicode `String`.
///
/// This is a convenience wrapper around `decode`.
/// Return None on malformed input or overflow.
/// Overflow can only happen on inputs that take more than
/// 63 encoded bytes, the DNS limit on domain name labels.
#[inline]
pub fn decode_to_string(input: &str) -> Option<String> {
decode(input).map(|chars| chars.into_iter().collect())
Some(Decoder::default().decode(input).ok()?.collect())
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Could you maybe add a unit test that exercises this method?

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sure, will do that at the evening

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it is now being tested together with encode_str and decode

}

/// Convert Punycode to Unicode.
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13 changes: 12 additions & 1 deletion idna/tests/punycode.rs
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Expand Up @@ -7,7 +7,7 @@
// except according to those terms.

use crate::test::TestFn;
use idna::punycode::{decode, encode_str};
use idna::punycode::{decode, decode_to_string, encode_str};
use serde_json::map::Map;
use serde_json::Value;
use std::panic::catch_unwind;
Expand All @@ -28,6 +28,17 @@ fn one_test(decoded: &str, encoded: &str) {
}
}

match decode_to_string(encoded) {
None => panic!("Decoding {} failed.", encoded),
Some(result) => assert!(
result == decoded,
"Incorrect decoding of \"{}\":\n \"{}\"\n!= \"{}\"\n",
encoded,
result,
decoded
),
}

match encode_str(decoded) {
None => panic!("Encoding {} failed.", decoded),
Some(result) => assert!(
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