chatsiri at chatsiri
Feb 2, 2012, 5:18 PM
Post #3 of 4
----- Original message -----
Re: Why the function ac_maketrans defined size of array is 256?
[In reply to]
> On 02/02/2012 05:53 AM, chatsiri wrote:
> > Hello All,
> > I debug code of clamav. Aho-Corasick( AC) Algorithms concepts for
> > matching between virus and signature files. Step for AC is build trie
> > ( keyword tree) for inserting signature from virus database files. I
> > have question in step build tire before matching with input
> > information. Why source code in "static int ac_maketrans(struct
> > cli_matcher *root)"  define size of array is 256?.
> Because the trie matches byte-by-byte, so each node has 256 children,
> and that includes the root.
What's contain in node? My view, Node contains a signature files for matching with virus in files.right? My plan for optimized algorithm code of string matching with GPU.
> > In addition, Do you using the Depth First Search Algorithm( DFS) for
> > building trie?
> ac_maketrans uses BFS.
> Best regards,
> Please submit your patches to our Bugzilla: http://bugs.clamav.net
Please submit your patches to our Bugzilla: http://bugs.clamav.net