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AK: Make LEB128 decoding work with read_value

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This commit is contained in:
Tim Schumacher 2023-01-30 00:02:38 +01:00 • committed by Andrew Kaster
parent 787f4d639a
commit 47531a42a9
9 changed files with 135 additions and 148 deletions
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63
Tests/AK/TestLEB128.cpp
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@ -21,11 +21,11 @@ TEST_CASE(single_byte)
buf[0] = i;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, output).is_error());
output = MUST(stream->read_value<LEB128<u32>>());
EXPECT_EQ(output, i);
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, output_signed).is_error());
output_signed = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(output_signed, i);
}
@ -34,11 +34,11 @@ TEST_CASE(single_byte)
buf[0] = i;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, output).is_error());
output = MUST(stream->read_value<LEB128<u32>>());
EXPECT_EQ(output, i);
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, output_signed).is_error());
output_signed = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(output_signed, (i | (-1 & (~0x3F))));
}
// MSB set, but input too short
@ -46,10 +46,10 @@ TEST_CASE(single_byte)
buf[0] = static_cast<u8>(i);
MUST(stream->seek(0));
EXPECT(LEB128::read_unsigned(*stream, output).is_error());
EXPECT(stream->read_value<LEB128<u32>>().is_error());
MUST(stream->seek(0));
EXPECT(LEB128::read_signed(*stream, output_signed).is_error());
EXPECT(stream->read_value<LEB128<i32>>().is_error());
}
}
@ -69,11 +69,11 @@ TEST_CASE(two_bytes)
buf[1] = j;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, output).is_error());
output = MUST(stream->read_value<LEB128<u32>>());
EXPECT_EQ(output, (static_cast<u32>(j) << 7) + (i & 0x7F));
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, output_signed).is_error());
output_signed = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(output_signed, (static_cast<i32>(j) << 7) + (i & 0x7F));
}
@ -82,11 +82,11 @@ TEST_CASE(two_bytes)
buf[1] = j;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, output).is_error());
output = MUST(stream->read_value<LEB128<u32>>());
EXPECT_EQ(output, (static_cast<u32>(j) << 7) + (i & 0x7F));
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, output_signed).is_error());
output_signed = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(output_signed, ((static_cast<i32>(j) << 7) + (i & 0x7F)) | (-1 & (~0x3FFF)));
}
@ -95,10 +95,10 @@ TEST_CASE(two_bytes)
buf[1] = static_cast<u8>(j);
MUST(stream->seek(0));
EXPECT(LEB128::read_unsigned(*stream, output).is_error());
EXPECT(stream->read_value<LEB128<u32>>().is_error());
MUST(stream->seek(0));
EXPECT(LEB128::read_signed(*stream, output_signed).is_error());
EXPECT(stream->read_value<LEB128<i32>>().is_error());
}
}
}
@ -107,27 +107,22 @@ TEST_CASE(overflow_sizeof_output_unsigned)
{
u8 u32_max_plus_one[] = { 0x80, 0x80, 0x80, 0x80, 0x10 };
{
u32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { u32_max_plus_one, sizeof(u32_max_plus_one) }));
EXPECT(LEB128::read_unsigned(*stream, out).is_error());
EXPECT_EQ(out, 0u);
EXPECT(stream->read_value<LEB128<u32>>().is_error());
u64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, out64).is_error());
u64 out64 = MUST(stream->read_value<LEB128<u64>>());
EXPECT_EQ(out64, static_cast<u64>(NumericLimits<u32>::max()) + 1);
}
u8 u32_max[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0x0F };
{
u32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { u32_max, sizeof(u32_max) }));
EXPECT(!LEB128::read_unsigned(*stream, out).is_error());
u32 out = MUST(stream->read_value<LEB128<u32>>());
EXPECT_EQ(out, NumericLimits<u32>::max());
u64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_unsigned(*stream, out64).is_error());
u64 out64 = MUST(stream->read_value<LEB128<u64>>());
EXPECT_EQ(out64, NumericLimits<u32>::max());
}
}
@ -136,53 +131,43 @@ TEST_CASE(overflow_sizeof_output_signed)
{
u8 i32_max_plus_one[] = { 0x80, 0x80, 0x80, 0x80, 0x08 };
{
i32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { i32_max_plus_one, sizeof(i32_max_plus_one) }));
EXPECT(LEB128::read_signed(*stream, out).is_error());
EXPECT_EQ(out, 0);
EXPECT(stream->read_value<LEB128<i32>>().is_error());
i64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, out64).is_error());
i64 out64 = MUST(stream->read_value<LEB128<i64>>());
EXPECT_EQ(out64, static_cast<i64>(NumericLimits<i32>::max()) + 1);
}
u8 i32_max[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0x07 };
{
i32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { i32_max, sizeof(i32_max) }));
EXPECT(!LEB128::read_signed(*stream, out).is_error());
i32 out = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(out, NumericLimits<i32>::max());
i64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, out64).is_error());
i64 out64 = MUST(stream->read_value<LEB128<i64>>());
EXPECT_EQ(out64, NumericLimits<i32>::max());
}
u8 i32_min_minus_one[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0x77 };
{
i32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { i32_min_minus_one, sizeof(i32_min_minus_one) }));
EXPECT(LEB128::read_signed(*stream, out).is_error());
EXPECT_EQ(out, 0);
EXPECT(stream->read_value<LEB128<i32>>().is_error());
i64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, out64).is_error());
i64 out64 = MUST(stream->read_value<LEB128<i64>>());
EXPECT_EQ(out64, static_cast<i64>(NumericLimits<i32>::min()) - 1);
}
u8 i32_min[] = { 0x80, 0x80, 0x80, 0x80, 0x78 };
{
i32 out = 0;
auto stream = MUST(FixedMemoryStream::construct(ReadonlyBytes { i32_min, sizeof(i32_min) }));
EXPECT(!LEB128::read_signed(*stream, out).is_error());
i32 out = MUST(stream->read_value<LEB128<i32>>());
EXPECT_EQ(out, NumericLimits<i32>::min());
i64 out64 = 0;
MUST(stream->seek(0));
EXPECT(!LEB128::read_signed(*stream, out64).is_error());
i64 out64 = MUST(stream->read_value<LEB128<i64>>());
EXPECT_EQ(out64, NumericLimits<i32>::min());
}
}