1 files changed, 80 insertions, 0 deletions
diff --git a/src/qclass_index.c b/src/qclass_index.c
new file mode 100644
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--- /dev/null
+++ b/src/qclass_index.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2008-2024 OARC, Inc.
+ * Copyright (c) 2007-2008, Internet Systems Consortium, Inc.
+ * Copyright (c) 2003-2007, The Measurement Factory, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "qclass_index.h"
+
+static unsigned short idx_to_qclass[65536];
+static int            next_idx = 0;
+
+int qclass_indexer(const dns_message* m)
+{
+    int i;
+    if (m->malformed)
+        return -1;
+    for (i = 0; i < next_idx; i++) {
+        if (m->qclass == idx_to_qclass[i]) {
+            return i;
+        }
+    }
+    idx_to_qclass[next_idx] = m->qclass;
+    return next_idx++;
+}
+
+static int next_iter;
+
+int qclass_iterator(const char** label)
+{
+    static char label_buf[32];
+    if (0 == next_idx)
+        return -1;
+    if (NULL == label) {
+        next_iter = 0;
+        return next_idx;
+    }
+    if (next_iter == next_idx) {
+        return -1;
+    }
+    snprintf(label_buf, sizeof(label_buf), "%d", idx_to_qclass[next_iter]);
+    *label = label_buf;
+    return next_iter++;
+}
+
+void qclass_reset()
+{
+    next_idx = 0;
+}