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-rw-r--r--src/vppinfra/random_buffer.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/vppinfra/random_buffer.c b/src/vppinfra/random_buffer.c
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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ Copyright (c) 2005 Eliot Dresselhaus
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <vppinfra/random_buffer.h>
+
+/* Fill random buffer. */
+void
+clib_random_buffer_fill (clib_random_buffer_t * b, uword n_words)
+{
+ uword *w, n = n_words;
+
+ if (n < 256)
+ n = 256;
+
+ n = round_pow2 (n, 2 << ISAAC_LOG2_SIZE);
+
+ vec_add2 (b->buffer, w, n);
+ do
+ {
+ isaac2 (b->ctx, w);
+ w += 2 * ISAAC_SIZE;
+ n -= 2 * ISAAC_SIZE;
+ }
+ while (n > 0);
+}
+
+void
+clib_random_buffer_init (clib_random_buffer_t * b, uword seed)
+{
+ uword i, j;
+
+ memset (b, 0, sizeof (b[0]));
+
+ /* Seed ISAAC. */
+ for (i = 0; i < ARRAY_LEN (b->ctx); i++)
+ {
+ uword s[ISAAC_SIZE];
+
+ for (j = 0; j < ARRAY_LEN (s); j++)
+ s[j] = ARRAY_LEN (b->ctx) * (seed + j) + i;
+
+ isaac_init (&b->ctx[i], s);
+ }
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */