fix signature offset calculation in large files

git-svn: trunk@1527

clamav-devel/ChangeLog

@@ -1,3 +1,8 @@
+Tue May 10 04:47:28 CEST 2005 (tk)
+----------------------------------
+  * libclamav/matcher.c: fix signature offset calculation in large files
+			 (problem reported by Christoph)
+
 Mon May  9 18:06:53 BST 2005 (njh)
 ----------------------------------
   * clamav-milter:	Print segfault diagnostic, even if print_trace is

clamav-devel/libclamav/matcher.c

@@ -311,11 +311,15 @@ int cli_scandesc(int desc, const char **virname, long int *scanned, const struct
 
 	if(bytes == SCANBUFF) {
 	    memmove(buffer, endbl, root->maxpatlen);
-	    offset += bytes - root->maxpatlen;
-	}
 
-        pt = buffer;
-        length = buffsize;
+	    if(pt == buffer) {
+		offset += SCANBUFF;
+	    } else {
+		offset += SCANBUFF - root->maxpatlen;
+		pt = buffer;
+		length = buffsize;
+	    }
+	}
 
 	if(root->md5_hlist)
 	    MD5_Update(&ctx, buff, bytes);