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Add an option to use zstd's recently introduced long range matching (off by default).

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This commit is contained in:
Ferenc Arn 2017-10-26 16:42:02 -04:00
parent 01815e9b5f
commit f3436a841a
5 changed files with 26 additions and 6 deletions
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20
core/io/compression.cpp
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@ -78,9 +78,16 @@ int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,
} break;
case MODE_ZSTD: {
ZSTD_CCtx *cctx = ZSTD_createCCtx();
ZSTD_CCtx_setParameter(cctx, ZSTD_p_compressionLevel, zstd_level);
if (zstd_long_distance_matching) {
ZSTD_CCtx_setParameter(cctx, ZSTD_p_enableLongDistanceMatching, 1);
ZSTD_CCtx_setParameter(cctx, ZSTD_p_windowLog, zstd_window_log_size);
}
int max_dst_size = get_max_compressed_buffer_size(p_src_size, MODE_ZSTD);
return ZSTD_compress(p_dst, max_dst_size, p_src, p_src_size, zstd_level);
int ret = ZSTD_compressCCtx(cctx, p_dst, max_dst_size, p_src, p_src_size, zstd_level);
ZSTD_freeCCtx(cctx);
return ret;
} break;
}
@ -165,8 +172,11 @@ int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p
return total;
} break;
case MODE_ZSTD: {
return ZSTD_decompress(p_dst, p_dst_max_size, p_src, p_src_size);
ZSTD_DCtx *dctx = ZSTD_createDCtx();
if (zstd_long_distance_matching) ZSTD_DCtx_setMaxWindowSize(dctx, 1 << 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;
} break;
}
@ -176,3 +186,5 @@ int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p
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;