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LibCompress: Write Deflate window size in the Zlib header

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Previously we said that the window size was always 512 bytes, which
caused errors during decompressing in apps outside of Serenity that
actually use this information.
Now, the value is always 7 (32 KiB).

Fixes: #14503
This commit is contained in:
Karol Kosek 2022-07-09 19:31:09 +02:00 committed by Idan Horowitz
parent 72a37e5292
commit 693d34fe3d
Notes: sideshowbarker 2024-07-17 09:33:14 +09:00 
Author: https://github.com/krkk
Commit: https://github.com/SerenityOS/serenity/commit/693d34fe3d
Pull-request: https://github.com/SerenityOS/serenity/pull/14530
Issue: https://github.com/SerenityOS/serenity/issues/14503
1 changed files with 7 additions and 1 deletions
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8
Userland/Libraries/LibCompress/Zlib.cpp
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@ -84,9 +84,15 @@ ZlibCompressor::~ZlibCompressor()
void ZlibCompressor::write_header(ZlibCompressionMethod compression_method, ZlibCompressionLevel compression_level)
{
u8 compression_info = 0;
if (compression_method == ZlibCompressionMethod::Deflate) {
compression_info = AK::log2(DeflateCompressor::window_size) - 8;
VERIFY(compression_info <= 7);
}
ZlibHeader header {
.compression_method = compression_method,
.compression_info = 0,
.compression_info = compression_info,
.check_bits = 0,
.present_dictionary = false,
.compression_level = compression_level,