IPhone computing large file MD5

+  (  Nsstring  *  ) Filemd5 :  ( Nsstring  *  )  Path  {      Nsfilehandle   * Handle=   [  Nsfilehandle   Filehandleforreadingatpath  :  Path  ] ;If  ( Handle =   Nil   )   Return @"Error getting file MD5" ; // File didnt exist Cc_md5_ctx MD5; cc_md5_init (  & MD5 ) ; Bool Done =   No ; While  (  ! Done )      {         Nsdata  * Filedata =   [ Handle Readdataoflength  : Chunk_size] ; Cc_md5_update (  & MD5, [ Filedata Bytes  ] ,[ Filedata Length  ]  ) ; If  (  [ Filedata Length  ]   =   0   ) Done =  Yes ; }      Unsigned   Char Digest [ Cc_md5_digest_length ] ; Cc_md5_final( Digest, & MD5 ) ; Nsstring  * S =   [ Nsstring   Stringwithformat  : @ "% 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x" , Digest [  0 ] , Digest [  1  ] , Digest [  2 ] , Digest [  3  ] , Digest [  4 ] , Digest [  5  ] , Digest [  6 ] , Digest [  7  ] , Digest [  8 ] , Digest [  9  ] , Digest [  10 ] , Digest [  11  ] , Digest [  12 ] , Digest [  13  ] , Digest [  14 ] , Digest [  15  ]  ] ; Return S;}