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encoding/utf8: enforce scalar and buffer bounds

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Hojun-Cho
2026-08-09 17:39:41 +09:00
parent 83101add2c
commit 8620e64313
4 changed files with 57 additions and 7 deletions
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16
lib/encoding/utf8/rune_test.ww
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@@ -20,7 +20,7 @@ import encoding.utf8;
};
// ref/hare/encoding/utf8/rune.ha:15. ASCII → 1; legal multibyte
// leads → 2/3/4; continuation and >0xF7 → invalid.
// leads → 2/3/4; continuation and >0xF4 → invalid.
@test fn utf8sz_classify() void = {
match (utf8.utf8sz(0u8)) {
@@ -51,7 +51,19 @@ import encoding.utf8;
case let n: i32 => { assert(!(n != 4)); };
case let e: utf8.invalid => { abort(); };
};
match (utf8.utf8sz(0xF8u8)) { // 5-byte lead — illegal in modern UTF-8
match (utf8.utf8sz(0xF4u8)) { // U+10FFFF may begin with F4
case let n: i32 => { assert(!(n != 4)); };
case let e: utf8.invalid => { abort(); };
};
match (utf8.utf8sz(0xF5u8)) { // above Unicode's scalar range
case let n: i32 => { abort(); };
case let e: utf8.invalid => void;
};
match (utf8.utf8sz(0xF6u8)) {
case let n: i32 => { abort(); };
case let e: utf8.invalid => void;
};
match (utf8.utf8sz(0xF7u8)) {
case let n: i32 => { abort(); };
case let e: utf8.invalid => void;
};