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[pull] master from ladislav-zezula:master #89

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Merged
pull merged 2 commits into from
Jun 9, 2026
Merged

[pull] master from ladislav-zezula:master #89

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3d23416
Add support for ZLIB compression level
heinermann Jun 9, 2026
bfed65b
Merge pull request #435 from heinermann/zlibarg
ladislav-zezula Jun 9, 2026
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12 changes: 10 additions & 2 deletions src/SCompression.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,14 @@ void Compress_ZLIB(void * pvOutBuffer, int * pcbOutBuffer, void * pvInBuffer, in

// Keep compilers happy
STORMLIB_UNUSED(pCmpType);
STORMLIB_UNUSED(nCmpLevel);

int level = Z_DEFAULT_COMPRESSION; // ZLIB usually decides this is 6 (Compression level used by WoW MPQs)
if (nCmpLevel == 1) {
level = 9;
}
else if (nCmpLevel == 2) {
level = 1;
}

// Fill the stream structure for zlib
z.next_in = (Bytef *)pvInBuffer;
Expand Down Expand Up @@ -134,8 +141,9 @@ void Compress_ZLIB(void * pvOutBuffer, int * pcbOutBuffer, void * pvInBuffer, in
// Initialize the compression.
// Storm.dll uses zlib version 1.1.3
// Wow.exe uses zlib version 1.2.3
// WC3:R, SC:R, and D2:R use zlib version 1.2.11
nResult = deflateInit2(&z,
6, // Compression level used by WoW MPQs
level,
Z_DEFLATED,
windowBits,
8,
Expand Down
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