c265bcbb5e
## Summary Phase #3a, stacked on #2469. Compresses each chunk record independently with libdeflate (random access preserved). Trammel: 124.7 MB → 19.2 MB (−85%). ## Details - Whole-record framing `[u32 UncompressedLen][payload]`; records that don't shrink (tiny Uniform) are stored raw, detected as payload length == UncompressedLen. - Codec chosen by full-Trammel spike: libdeflate VeryHigh (16.5 MB, 1.83 µs/chunk decompress) over zstd L19/22 (17.4 MB) and managed Brotli q11 (16.4 MB) — best native ratio, fastest decompress, already the repo's packet codec (no new dependency). - Reuses cached thread-static bindings: `Deflate.Maximum` for bake, `Deflate.Standard` for reads. - Compression is bake-time only; decompression is one-time per chunk (LRU-cached). - Format v7; v6 files rejected and re-baked once. ## Tests v7 unit tests + the v6 suite run through the compression path; full pathfinding suite green; Release build clean.
35 lines
1.8 KiB
C#
35 lines
1.8 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2026 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: Deflate.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.IO.Compression;
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namespace Server.Compression;
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public static class Deflate
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{
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[ThreadStatic]
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private static LibDeflateBinding _standard;
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[ThreadStatic]
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private static LibDeflateBinding _maximum;
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public static LibDeflateBinding Standard => _standard ??= new LibDeflateBinding();
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// Best-ratio compressor. Construction allocates a native libdeflate compressor, so it is
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// cached per thread like Standard and reused. Decompression is level-independent, so the
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// decompress path can use either accessor. libdeflate is not thread-safe — hence ThreadStatic.
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public static LibDeflateBinding Maximum => _maximum ??= new LibDeflateBinding(LibDeflateCompressionLevel.VeryHigh);
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}
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