[EXPERIMENTAL, FOR BENCHMARKING ONLY] Zstandard compression support

[wimlib] / include / wimlib.h

diff --git a/include/wimlib.h b/include/wimlib.h
index 047716c0338ea9887ca58f5b52127204b70457d1..8a1d71b8bb260cf16deaaf79837c77c6b29edbd8 100644 (file)
--- a/include/wimlib.h
+++ b/include/wimlib.h
@@ -568,6 +568,18 @@ enum wimlib_compression_type {
         * up to and including <c>2^30</c>.
         */
        WIMLIB_COMPRESSION_TYPE_LZMS = 3,
+
+       /**
+        * The Zstandard compression format.  This is a wimlib extension;
+        * Microsoft's WIMGAPI does not support this format.  Zstandard supports
+        * chunk sizes from 4096 to 268435456 bytes, with the default being
+        * 131072.  Multiple compression levels are supported as well.  For
+        * consistency with wimlib's other compression types, the compression
+        * levels exposed by libzstd are multiplied by 5; e.g., wimlib's level
+        * 50 (the default level) corresponds to libzstd's level 10.  libzstd
+        * allows levels 1 through 22.
+        */
+       WIMLIB_COMPRESSION_TYPE_ZSTD = 4,
 };
 
 /** @} */