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AK: Use the correct data types in bitap_bitwise()

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Otherwise the bit twiddling goes all wrong and breaks some boundary
cases.
Fixes `StringView::contains(31-chars)`.
This commit is contained in:
Ali Mohammad Pur 2022-07-14 07:23:36 +04:30 committed by Andreas Kling
parent ae60357951
commit 0d6dc74951
Notes: sideshowbarker 2024-07-17 09:49:33 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/0d6dc74951
Pull-request: https://github.com/SerenityOS/serenity/pull/14580
2 changed files with 9 additions and 2 deletions
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4
AK/MemMem.h
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@ -19,10 +19,10 @@ constexpr void const* bitap_bitwise(void const* haystack, size_t haystack_length
{
VERIFY(needle_length < 32);
u64 lookup = 0xfffffffe;
u32 lookup = 0xfffffffe;
constexpr size_t mask_length = (size_t)((u8)-1) + 1;
u64 needle_mask[mask_length];
u32 needle_mask[mask_length];
for (size_t i = 0; i < mask_length; ++i)
needle_mask[i] = 0xffffffff;

7
Tests/AK/TestMemory.cpp
View file

@ -27,6 +27,13 @@ TEST_CASE(bitap)
EXPECT_EQ(result_1, &haystack[2]);
EXPECT_EQ(result_2, &haystack[4]);
EXPECT_EQ(result_3, nullptr);
auto haystack_string = "Main function must return c_int\n"sv;
auto needle_string = "Main function must return c_int"sv;
auto result = AK::Detail::bitap_bitwise(haystack_string.characters_without_null_termination(), haystack_string.length(), needle_string.characters_without_null_termination(), needle_string.length());
EXPECT_NE(result, nullptr);
}
TEST_CASE(kmp_one_chunk)