test: prove Modified UTF-8 overlong NUL (0xC0 0x80) is rejected as OK…#42
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test: prove Modified UTF-8 overlong NUL (0xC0 0x80) is rejected as OK…#42
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…J_ERROR_BAD_STRING Add test_utf8_overlong_nul_c0_80 which mathematically proves that the two-byte sequence 0xC0 0x80 — the "Modified UTF-8" overlong encoding of U+0000 — is caught by okj_validate_utf8_sequence and causes okj_parse to return OKJ_ERROR_BAD_STRING rather than accepting the sequence as valid or treating it as a premature string terminator. Proof embedded in the test comment: b0 = 0xC0 (192) ASCII gate: 0xC0 <= 0x7F => 192 <= 127 => FALSE 2-byte gate: 0xC0 >= 0xC2 => 192 >= 194 => FALSE (0xC0 and 0xC1 are deliberately excluded from [0xC2, 0xDF] per RFC 3629 §3) All remaining branch predicates also fail for b0 = 0xC0. Fall-through return 0U -> OKJ_ERROR_BAD_STRING. https://claude.ai/code/session_01HHohyZBhqxpWqruAGoeDtZ
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…J_ERROR_BAD_STRING
Add test_utf8_overlong_nul_c0_80 which mathematically proves that the two-byte sequence 0xC0 0x80 — the "Modified UTF-8" overlong encoding of U+0000 — is caught by okj_validate_utf8_sequence and causes okj_parse to return OKJ_ERROR_BAD_STRING rather than accepting the sequence as valid or treating it as a premature string terminator.
Proof embedded in the test comment:
b0 = 0xC0 (192)
ASCII gate: 0xC0 <= 0x7F => 192 <= 127 => FALSE
2-byte gate: 0xC0 >= 0xC2 => 192 >= 194 => FALSE
(0xC0 and 0xC1 are deliberately excluded from [0xC2, 0xDF] per RFC 3629 §3)
All remaining branch predicates also fail for b0 = 0xC0.
Fall-through return 0U -> OKJ_ERROR_BAD_STRING.
https://claude.ai/code/session_01HHohyZBhqxpWqruAGoeDtZ