Antivirus, Malware File Scanner in C/Obj C

Software required to scan files and detect Virus and Malware - Must be based in C, preferably Objective C or wrapped in Objective C. - Raw files will be selected by a User to scan. - Software must scan the file and report type and prescence of any Virus or Malware in the file. - Should support source file for Virus and Malware definitions that can be updated with additions to the definition file. - Deliver C/ObjC source wrapped in an OS X application or command line executable. Would prefer an open-source solution, not a custom built solution. Leverage existing libraries, port from Java or other source. PM with questions or clarification. Thanks for your consideration, Christopher