cb9cadad57
Change-Id: Ib246f1fbfce93274020ee93ce461e3d8bd8b9f17 Signed-off-by: Ed Warnicke <eaw@cisco.com>
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* Copyright (c) 2015 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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Copyright (c) 2005 Eliot Dresselhaus
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <vppinfra/random_buffer.h>
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/* Fill random buffer. */
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void clib_random_buffer_fill (clib_random_buffer_t * b, uword n_words)
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{
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uword * w, n = n_words;
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if (n < 256)
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n = 256;
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n = round_pow2 (n, 2 << ISAAC_LOG2_SIZE);
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vec_add2 (b->buffer, w, n);
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do {
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isaac2 (b->ctx, w);
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w += 2 * ISAAC_SIZE;
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n -= 2 * ISAAC_SIZE;
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} while (n > 0);
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}
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void clib_random_buffer_init (clib_random_buffer_t * b, uword seed)
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{
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uword i, j;
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memset (b, 0, sizeof (b[0]));
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/* Seed ISAAC. */
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for (i = 0; i < ARRAY_LEN (b->ctx); i++)
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{
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uword s[ISAAC_SIZE];
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for (j = 0; j < ARRAY_LEN (s); j++)
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s[j] = ARRAY_LEN (b->ctx) * (seed + j) + i;
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isaac_init (&b->ctx[i], s);
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}
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}
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