datadog: fix UTF-8 continuation byte handling in metric name sanitiza…#212
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kevinburkesegment merged 1 commit intomainfrom Nov 4, 2025
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datadog: fix UTF-8 continuation byte handling in metric name sanitiza…#212kevinburkesegment merged 1 commit intomainfrom
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…tion The previous implementation had a subtle bug when processing invalid UTF-8 sequences. When encountering an orphaned continuation byte (0x80-0xBF) or incomplete multi-byte sequence, the code would insert a replacement character but fail to skip the continuation bytes that followed. This could result in: 1. Invalid UTF-8 output when continuation bytes were processed as standalone characters 2. Multiple consecutive replacement characters instead of collapsing them 3. Incorrect handling of mixed valid/invalid UTF-8 sequences This fix properly skips continuation bytes after detecting invalid sequences, ensuring the output is always valid UTF-8. The change also renames `accentMap` to `latin1SupplementMap` with improved documentation to clarify that it maps Unicode codepoints in the Latin-1 Supplement range (U+00C0-U+00FF), not the array indices themselves. Added comprehensive test cases covering edge cases like orphaned continuation bytes, incomplete sequences, invalid surrogates, and mixed valid/invalid UTF-8. Also added fuzz testing and benchmarks to validate correctness and performance. Co-Authored-By: Claude <noreply@anthropic.com>
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…tion
The previous implementation had a subtle bug when processing invalid UTF-8 sequences. When encountering an orphaned continuation byte (0x80-0xBF) or incomplete multi-byte sequence, the code would insert a replacement character but fail to skip the continuation bytes that followed. This could result in:
This fix properly skips continuation bytes after detecting invalid sequences, ensuring the output is always valid UTF-8. The change also renames
accentMaptolatin1SupplementMapwith improved documentation to clarify that it maps Unicode codepoints in the Latin-1 Supplement range (U+00C0-U+00FF), not the array indices themselves.Added comprehensive test cases covering edge cases like orphaned continuation bytes, incomplete sequences, invalid surrogates, and mixed valid/invalid UTF-8. Also added fuzz testing and benchmarks to validate correctness and performance.