add oid and bitstring parsing and formatting to "generic" format string

routines, test them in t10.c

scan_asn1rawoid.c

@@ -0,0 +1,40 @@
+#include "asn1.h"
+
+size_t scan_asn1rawoid(const char* src,const char* max,unsigned long* array,size_t* arraylen) {
+  const char* orig=src;
+  size_t cur=0,al;
+  if (!arraylen) return 0;
+  al=*arraylen; *arraylen=0;
+  if (max-src<1) return 0;	/* there has to be at least one octet */
+
+  {
+    int a,b;
+    a=(unsigned char)*src;
+    b=a%40;
+    a/=40;
+    /* a can be 0, 1 or 2.  And b is <=39 if a is 0 or 1.
+     * So, if a is bigger than 2, it is really 2 */
+    if (a>2) {
+      b+=(a-2)*40;
+      a=2;
+    }
+    if (array && cur<al) array[cur]=a; ++cur;
+    if (array && cur<al) array[cur]=b; ++cur;
+  }
+
+  for (++src; src<max; ) {
+    size_t i;
+    unsigned long tmp;
+    if (!(i=scan_asn1tagint(src,max,&tmp)))
+      return 0;
+    src+=i;
+    if (array && cur<al) array[cur]=tmp; ++cur;
+  }
+
+  /* if we got this far, then we have an OID, but it might not have fit */
+  *arraylen=cur;
+  if (cur>al)		/* did not fit */
+    return 0;
+  return src-orig;
+}
+