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8 commits

Author SHA1 Message Date
Timothy Flynn
eed956b473 AK: Increase LittleEndianOutputBitStream's buffer size and remove loops
This is very similar to the LittleEndianInputBitStream bit buffer change
from 8e834d4bb2.

We currently buffer one byte of data for the underlying stream. And when
we put bits onto that buffer, we do so 1 bit at a time.

This replaces the u8 buffer with a u64. And instead of looping at all,
we perform bitwise operations to write the desired number of bits.

Using the "enwik8" file as a test (100MB uncompressed, commonly used in
benchmarks: https://www.mattmahoney.net/dc/enwik8.zip), compression time
decreases from:

    13.62s to 10.9s on Serenity (cold)
    13.62s to 9.22s on Serenity (warm)
    2.93s to 2.32s on Linux

One caveat is that this requires explicitly flushing any leftover bits
when the caller is done with the stream. The byte buffer implementation
implicitly flushed its data every time the buffer was byte-aligned, as
doing so would always fill the byte. This is no longer the case. But for
now, this should be fine as the one user of this class, DEFLATE, already
has a "flush everything now that we're done" finalizer.
2023-04-02 10:54:37 +02:00
Tim Schumacher
43f98ac6e1 Everywhere: Remove the AK:: qualifier from Stream usages 2023-02-13 00:50:07 +00:00
Tim Schumacher
8b2f23d016 AK: Remove the fallible constructor from LittleEndianOutputBitStream 2023-02-08 17:44:32 +00:00
Tim Schumacher
0fee97916b AK: Remove the fallbile constructor from BigEndianOutputBitStream 2023-02-08 17:44:32 +00:00
Tim Schumacher
261d62438f AK: Remove the fallible constructor from LittleEndianInputBitStream 2023-02-08 17:44:32 +00:00
Tim Schumacher
fa09152e23 AK: Remove the fallible constructor from BigEndianInputBitStream 2023-02-08 17:44:32 +00:00
Tim Schumacher
093cf428a3 AK: Move memory streams from LibCore 2023-01-29 19:16:44 -07:00
Tim Schumacher
2470dd3bb5 AK: Move bit streams from LibCore 2023-01-29 19:16:44 -07:00