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AK: Add an option to zero-fill ByteBuffer data upon growth

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This is to avoid UB in cases where we need to be able to read from the
buffer immediately after resizing it.
This commit is contained in:
Timothy Flynn 2023-12-27 10:11:20 -05:00 • committed by Andreas Kling
parent 759c8ccc55
commit 507a5d8a07
2 changed files with 30 additions and 3 deletions
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17
Tests/AK/TestByteBuffer.cpp
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@ -46,6 +46,23 @@ TEST_CASE(byte_buffer_vector_contains_slow_bytes)
EXPECT_EQ(vector.contains_slow(c), true);
}
TEST_CASE(zero_fill_new_elements_on_growth)
{
auto buffer = MUST(ByteBuffer::create_uninitialized(5));
buffer.span().fill(1);
EXPECT_EQ(buffer.span(), (Array<u8, 5> { 1, 1, 1, 1, 1 }));
buffer.resize(8, ByteBuffer::ZeroFillNewElements::Yes);
EXPECT_EQ(buffer.span(), (Array<u8, 8> { 1, 1, 1, 1, 1, 0, 0, 0 }));
buffer.span().fill(2);
EXPECT_EQ(buffer.span(), (Array<u8, 8> { 2, 2, 2, 2, 2, 2, 2, 2 }));
buffer.resize(10, ByteBuffer::ZeroFillNewElements::Yes);
EXPECT_EQ(buffer.span(), (Array<u8, 10> { 2, 2, 2, 2, 2, 2, 2, 2, 0, 0 }));
}
BENCHMARK_CASE(append)
{
ByteBuffer bb;