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AK+LibCore: Make output buffered stream seekable

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Just like with input buffered streams, we don't currently have a use
case for output buffered streams which aren't seekable, since the main
application are files.
This commit is contained in:
kleines Filmröllchen 2023-07-04 17:47:23 +02:00 • committed by Andrew Kaster
parent c2d9d0277f
commit 001ea22917
3 changed files with 46 additions and 10 deletions
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18
Tests/LibCore/TestLibCoreStream.cpp
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@ -111,6 +111,24 @@ BENCHMARK_CASE(file_tell)
}
}
TEST_CASE(file_buffered_write_and_seek)
{
auto file = TRY_OR_FAIL(Core::OutputBufferedFile::create(TRY_OR_FAIL(Core::File::open("/tmp/file-buffered-write-test.txt"sv, Core::File::OpenMode::Truncate | Core::File::OpenMode::ReadWrite))));
TRY_OR_FAIL(file->write_some("0123456789"sv.bytes()));
EXPECT_EQ(file->tell().release_value(), 10ul);
// Reads don't go through the buffer, so after we seek, the data must be available from the underlying file.
TRY_OR_FAIL(file->seek(0, AK::SeekMode::SetPosition));
auto first_byte = TRY_OR_FAIL(file->read_value<u8>());
EXPECT_EQ(first_byte, static_cast<u8>('0'));
TRY_OR_FAIL(file->seek(9, AK::SeekMode::SetPosition));
auto last_byte = TRY_OR_FAIL(file->read_value<u8>());
EXPECT_EQ(last_byte, static_cast<u8>('9'));
EXPECT_EQ(file->tell().release_value(), 10ul);
}
TEST_CASE(file_adopt_fd)
{
int rc = ::open("/usr/Tests/LibCore/long_lines.txt", O_RDONLY);