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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
Notes: sideshowbarker 2024-07-17 23:21:29 +09:00 
Author: https://github.com/standardexe
Commit: https://github.com/SerenityOS/serenity/commit/cdaa179eeb2
Pull-request: https://github.com/SerenityOS/serenity/pull/11130
4 changed files with 35 additions and 1 deletions
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1
Tests/LibCore/10kb.txt Normal file
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File diff suppressed because one or more lines are too long

2
Tests/LibCore/CMakeLists.txt
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@ -9,4 +9,4 @@ foreach(source IN LISTS TEST_SOURCES)
serenity_test("${source}" LibCore)
endforeach()
install(FILES long_lines.txt DESTINATION usr/Tests/LibCore)
install(FILES long_lines.txt 10kb.txt DESTINATION usr/Tests/LibCore)

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);
}
}

1
Userland/Libraries/LibCore/IODevice.cpp
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@ -245,6 +245,7 @@ bool IODevice::seek(i64 offset, SeekMode mode, off_t* pos)
break;
case SeekMode::FromCurrentPosition:
m = SEEK_CUR;
offset -= m_buffered_data.size();
break;
case SeekMode::FromEndPosition:
m = SEEK_END;