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LibCore: Fix relative seeking in IODevice

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The recently introduced read buffer in IODevice broke relative seeking.
The amount of data in the buffer wouldn't get taken into account.
This commit is contained in:
Arne Elster 2021-11-29 19:56:29 +01:00 • committed by Andreas Kling
parent b818d4c7e3
commit cdaa179eeb
4 changed files with 35 additions and 1 deletions
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32
Tests/LibCore/TestLibCoreIODevice.cpp
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@ -44,3 +44,35 @@ TEST_CASE(file_readline)
EXPECT_EQ(inputData[i], outputData[i]);
}
}
TEST_CASE(file_get_read_position)
{
const String path = "10kb.txt";
auto file = Core::File::open(path, Core::OpenMode::ReadOnly).release_value();
const size_t step_size = 98;
for (size_t i = 0; i < 10240 - step_size; i += step_size) {
auto read_buffer = file->read(step_size);
EXPECT_EQ(read_buffer.size(), step_size);
for (size_t j = 0; j < read_buffer.size(); j++) {
EXPECT_EQ(static_cast<u32>(read_buffer[j] - '0'), (i + j) % 10);
}
off_t offset = 0;
VERIFY(file->seek(0, Core::SeekMode::FromCurrentPosition, &offset));
EXPECT_EQ(offset, static_cast<off_t>(i + step_size));
}
{
off_t offset = 0;
VERIFY(file->seek(0, Core::SeekMode::FromEndPosition, &offset));
EXPECT_EQ(offset, 10240);
}
{
off_t offset = 0;
VERIFY(file->seek(0, Core::SeekMode::SetPosition, &offset));
EXPECT_EQ(offset, 0);
}
}