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AK: Add CircularBuffer::flush_to_stream

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In a similar fashion to what have been done with `fill_from_stream`,
this new method allows to write CircularBuffer's data to a Stream
without additional copies.
This commit is contained in:
Lucas CHOLLET 2023-04-30 20:56:20 -04:00 committed by Andreas Kling
parent 2a91245a96
commit 48b000a36c
Notes: sideshowbarker 2024-07-17 05:18:58 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/48b000a36c
Pull-request: https://github.com/SerenityOS/serenity/pull/18590
Reviewed-by: https://github.com/timschumi ✅
2 changed files with 18 additions and 0 deletions
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17
AK/CircularBuffer.cpp
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@ -206,6 +206,23 @@ ErrorOr<size_t> CircularBuffer::fill_from_stream(Stream& stream)
return bytes.size();
}
ErrorOr<size_t> CircularBuffer::flush_to_stream(Stream& stream)
{
auto next_span = next_read_span();
if (next_span.size() == 0)
return 0;
auto written_bytes = TRY(stream.write_some(next_span));
m_used_space -= written_bytes;
m_reading_head += written_bytes;
if (m_reading_head >= capacity())
m_reading_head -= capacity();
return written_bytes;
}
ErrorOr<size_t> CircularBuffer::copy_from_seekback(size_t distance, size_t length)
{
if (distance > m_seekback_limit)

1
AK/CircularBuffer.h
View File

@ -28,6 +28,7 @@ public:
Bytes read(Bytes bytes);
ErrorOr<void> discard(size_t discarded_bytes);
ErrorOr<size_t> fill_from_stream(Stream&);
ErrorOr<size_t> flush_to_stream(Stream&);
/// Compared to `read()`, this starts reading from an offset that is `distance` bytes
/// before the current write pointer and allows for reading already-read data.