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

routines, test them in t10.c

fmt_asn1bitstring.c

@@ -0,0 +1,19 @@
+#include "asn1.h"
+#include "byte.h"
+
+/* like fmt_asn1string, but l is in BITS, not BYTES */
+size_t fmt_asn1bitstring(char* dest,enum asn1_tagclass tc,enum asn1_tagtype tt,enum asn1_tag tag,const char* c,size_t l) {
+  size_t len;
+  size_t actuallen;
+  if (l>(size_t)-100) return (size_t)-1;
+  actuallen=1+(l+7)/8;	/* add one octet to specify the unused bits in the last octet, and calculate octets needed */
+  len=fmt_asn1transparent(dest,tc,tt,tag,actuallen);
+  if (dest) {
+    if (l)
+      dest[len]=7-((l-1)%8);
+    else
+      dest[len]=0;
+    byte_copy(dest+len+1,actuallen-1,c);
+  }
+  return len+actuallen;
+}