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AK+LibCompress: Remove the Deflate back-reference intermediate buffer

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Instead of reading bytes from the output stream into a buffer, just to
immediately write them back out, we can skip the middle-man and copy the
bytes directly into the output buffer.
This commit is contained in:
Timothy Flynn 2023-03-30 14:02:22 -04:00 • committed by Andreas Kling
parent 9f238793e0
commit 8b56d82865
3 changed files with 19 additions and 3 deletions
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4
Userland/Libraries/LibCompress/Deflate.cpp
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@ -207,9 +207,7 @@ ErrorOr<bool> DeflateDecompressor::CompressedBlock::try_read_more()
m_decompressor.m_output_buffer.write({ &byte, sizeof(byte) });
}
} else {
Array<u8, DeflateDecompressor::max_back_reference_length> buffer;
auto bytes = TRY(m_decompressor.m_output_buffer.read_with_seekback({ buffer.data(), length }, distance));
m_decompressor.m_output_buffer.write(bytes);
TRY(m_decompressor.m_output_buffer.copy_from_seekback(distance, length));
}
return true;