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Compression: Set Zstd max window size via public parameter 

`ZSTD_DCtx_setMaxWindowSize` is still part of the experimental API
(thus unexposed in the shared library). Upstream examples seem to
use `ZSTD_d_windowLogSize` instead, so it's probably what we should
use too.

Fixes #17374.
Distro packagers can now unbundle Zstd.

(cherry picked from commit 20265879e2)
This commit is contained in:
Rémi Verschelde 2019-04-18 13:17:34 +02:00
parent 4298db56cf
commit 01b39be9e6
1 changed files with 4 additions and 2 deletions
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6
core/io/compression.cpp
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@ -175,7 +175,9 @@ int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p
} break;
case MODE_ZSTD: {
ZSTD_DCtx *dctx = ZSTD_createDCtx();
if (zstd_long_distance_matching) ZSTD_DCtx_setMaxWindowSize(dctx, (size_t)1 << zstd_window_log_size);
if (zstd_long_distance_matching) {
ZSTD_DCtx_setParameter(dctx, ZSTD_d_windowLogMax, zstd_window_log_size);
}
int ret = ZSTD_decompressDCtx(dctx, p_dst, p_dst_max_size, p_src, p_src_size);
ZSTD_freeDCtx(dctx);
return ret;
@ -189,4 +191,4 @@ int Compression::zlib_level = Z_DEFAULT_COMPRESSION;
int Compression::gzip_level = Z_DEFAULT_COMPRESSION;
int Compression::zstd_level = 3;
bool Compression::zstd_long_distance_matching = false;
int Compression::zstd_window_log_size = 27;
int Compression::zstd_window_log_size = 27; // ZSTD_WINDOWLOG_LIMIT_DEFAULT