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Write both bytes of the escape before consuming the input character, so that a retry after the output buffer is enlarged starts at the tilde.
gpshead
added
needs backport to 3.14
gpshead
marked this pull request as ready for review
October 23, 2026 22:00
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hz_encode()wrote the first byte of the~~escape, consumed the input character, and only then wrote the second byte. When the output buffer was full at that point,multibytecodec_encode()enlarged it and resumed at the next character, so the second~was lost. The escape is now written withWRITEBYTE2beforeNEXT(1, 2), like the other multi-byte writes in this file, so the retry starts at the tilde again.The test sweeps the text length across the initial buffer size and its first enlargement; it fails at 4 of the 120 lengths without the fix. Backports to branches older than 3.14 would need
assertEndsWithreplaced, but 3.14 and 3.15 have it.Fixes #160518
ANT-2026-FXW1XYKR
hzcodec encodes~as a single~when the output buffer fills mid-escape #160518