xfsprogs: do slightly less obfuscation in the file name
PATCH 2/6 xfsprogs: do slightly less obfuscation in the file name
When the last five characters in an obfuscated filename are generated, one of them has a randomized top nibble. This is a fairly copmlete way of doing this. But the lower nibble is already effectively a random character (taken from four bits of a the hash value) so we don't lose much by simply assuming the the top bits are always zero. This simplifies the generation of two of the final five characters, and makes them all get done in a consistent way. Add the use of a mask in the one case it wasn't used to be even more consistent.
Signed-off-by Alex Elder <[email protected]>
--- db/metadump.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
db/metadump.c +2 -4
@@ -464,8 +464,7 @@ generate_obfuscated_name(*/ newhash =rol32 (newhash,3 ) ^ hash; - newp[namelen -5 ] = (newhash >>28 ) | - (random_filename_char () &0xf0 ); + newp[namelen -5 ] = (newhash >>28 ) &0x7f ;if (is_invalid_char (newp[namelen -5 ]))continue ; newp[namelen -4 ] = (newhash >>21 ) &0x7f ;
@@ -477,8 +476,7 @@ generate_obfuscated_name( newp[namelen -2 ] = (newhash >>7 ) &0x7f ;if (is_invalid_char (newp[namelen -2 ]))continue ; - newp[namelen -1 ] = ((newhash >>0 ) ^ - (newp[namelen -5 ] >>4 )) &0x7f ; + newp[namelen -1 ] = (newhash >>0 ) &0x7f ;if (is_invalid_char (newp[namelen -1 ]))continue ;break ;
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