BIT STRING JER hex encoding from sprintf to lookup

skeletons/BIT_STRING_jer.c

@@ -11,11 +11,10 @@ BIT_STRING_encode_jer(const asn_TYPE_descriptor_t *td, const void *sptr,
                       int ilevel, enum jer_encoder_flags_e flags,
                       asn_app_consume_bytes_f *cb, void *app_key) {
     asn_enc_rval_t er = {0, 0, 0};
-    char scratch[128];
+    const char * const h2c = "0123456789ABCDEF";
+    char scratch[16 * 3 + 4];
     char *p = scratch;
-    char *scend = scratch + (sizeof(scratch) - 4);
     const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
-    int xcan = 1;
     uint8_t *buf;
     uint8_t *end;
 
@@ -28,29 +27,26 @@ BIT_STRING_encode_jer(const asn_TYPE_descriptor_t *td, const void *sptr,
     end = buf + st->size - 1;  /* Last byte is special */
 
     /*
-     * Binary dump
+     * Hex dump
      */
     *p++ = '"';
-    for(; buf < end; buf++) {
-        int v = *buf;
-        int nline = xcan?0:(((buf - st->buf) % 8) == 0);
-        if(p >= scend || nline) {
-            ASN__CALLBACK(scratch, p - scratch);
+    for(int i = 0; buf < end; buf++, i++) {
+        if(!(i % 16) && (i || st->size > 16)) {
+            ASN__CALLBACK(scratch, p-scratch);
             p = scratch;
-            if(nline) ASN__TEXT_INDENT(1, ilevel);
         }
-        p += sprintf(p, "%02x", v);
+        *p++ = h2c[*buf >> 4];
+        *p++ = h2c[*buf & 0x0F];
     }
 
-    if(!xcan && ((buf - st->buf) % 8) == 0)
-        ASN__TEXT_INDENT(1, ilevel);
     ASN__CALLBACK(scratch, p - scratch);
     p = scratch;
 
     if(buf == end) {
-        uint8_t v = *buf;
         int ubits = st->bits_unused;
-        p += sprintf(p, "%02x", v & (0xff << ubits));
+        uint8_t v = *buf & (0xff << ubits);
+        *p++ = h2c[v >> 4];
+        *p++ = h2c[v & 0x0F];
         ASN__CALLBACK(scratch, p - scratch);
         p = scratch;
     }