add zstd support (#90)

Author: opoplawski

libarchive/ffi.py

@@ -167,7 +167,7 @@ def ffi(name, argtypes, restype, errcheck=None):
 
 READ_FILTERS = set((
     'all', 'bzip2', 'compress', 'grzip', 'gzip', 'lrzip', 'lzip', 'lzma',
-    'lzop', 'none', 'rpm', 'uu', 'xz', 'lz4'
+    'lzop', 'none', 'rpm', 'uu', 'xz', 'lz4', 'zstd'
 ))
 for f_name in list(READ_FILTERS):
     try:
@@ -229,7 +229,7 @@ def ffi(name, argtypes, restype, errcheck=None):
 
 WRITE_FILTERS = set((
     'b64encode', 'bzip2', 'compress', 'grzip', 'gzip', 'lrzip', 'lzip', 'lzma',
-    'lzop', 'uuencode', 'xz', 'lz4'
+    'lzop', 'uuencode', 'xz', 'lz4', 'zstd'
 ))
 for f_name in list(WRITE_FILTERS):
     try: