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pjproject-2.11.1/third_party/srtp/crypto/replay/ut_sim.c

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+/*
+ * ut_sim.c
+ *
+ * an unreliable transport simulator
+ * (for testing replay databases and suchlike)
+ * 
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+
+/*
+ *	
+ * Copyright (c) 2001-2017, Cisco Systems, 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:
+ * 
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ *   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.
+ * 
+ *   Neither the name of the Cisco Systems, Inc. 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 HOLDERS 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.
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include "ut_sim.h"
+
+
+int
+ut_compar(const void *a, const void *b) {
+  return rand() > (RAND_MAX/2) ? -1 : 1;
+}
+
+void
+ut_init(ut_connection *utc) {
+  int i;
+  utc->index = 0;
+
+  for (i=0; i < UT_BUF; i++)
+    utc->buffer[i] = i;
+  
+  qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
+
+  utc->index = UT_BUF - 1;
+}
+
+uint32_t
+ut_next_index(ut_connection *utc) {
+  uint32_t tmp;
+
+  tmp = utc->buffer[0];
+  utc->index++;
+  utc->buffer[0] = utc->index;
+
+  qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
+  
+  return tmp;
+}
+
+
+
+#ifdef UT_TEST
+
+#include <stdio.h>
+
+int
+main() {
+  uint32_t i, irecvd, idiff;
+  ut_connection utc;
+
+  ut_init(&utc);
+
+  for (i=0; i < 1000; i++) {
+    irecvd = ut_next_index(&utc);
+    idiff = i - irecvd;
+    printf("%lu\t%lu\t%d\n", i, irecvd, idiff);
+  }
+  
+  return 0;
+}
+
+
+#endif