f74de24fbd
When an invalid UTF-8 byte sequence is decoded in a range loop over a string a utf8.RuneError rune is returned. This is not distinguishable from decoding the valid '\uFFFD' sequence representing utf8.RuneError from a string without further checks within the range loop. The previous Map code did not do any extra checks and would thereby not map invalid UTF-8 byte sequences correctly when those were mapping to utf8.RuneError. Fix this by adding the extra checks necessary to distinguish the decoding of invalid utf8 byte sequences from decoding the sequence for utf8.RuneError when the mapping of a rune is utf8.RuneError. This fix does not result in a measureable performance regression: name old time/op new time/op delta ByteByteMap 1.05µs ± 3% 1.03µs ± 3% ~ (p=0.118 n=10+10) Map/identity/ASCII 169ns ± 2% 170ns ± 1% ~ (p=0.501 n=9+10) Map/identity/Greek 298ns ± 1% 303ns ± 4% ~ (p=0.338 n=10+10) Map/change/ASCII 323ns ± 3% 325ns ± 4% ~ (p=0.679 n=8+10) Map/change/Greek 628ns ± 5% 635ns ± 1% ~ (p=0.460 n=10+9) MapNoChanges 120ns ± 4% 119ns ± 1% ~ (p=0.496 n=10+9) Fixes #26305 Change-Id: I70e99fa244983c5040756fa4549ac1e8cb6022c3 Reviewed-on: https://go-review.googlesource.com/c/131495 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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