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155 lines
4 KiB
C
155 lines
4 KiB
C
/*-
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* Copyright (c) 2015-2016 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <cryb/hash.h>
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#include <cryb/test.h>
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#define ADLER32_INVALID 0xffffffffLU
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#define TRI(n) (n * (n + 1) / 2)
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static uint8_t ones8[65536];
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struct t_case {
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const char *desc;
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const void *data;
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size_t len;
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uint32_t sum;
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};
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/***************************************************************************
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* Test cases
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*
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* Most of these test cases use input sequences where each word has the
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* value 1. To understand the test cases, it helps to realize that (until
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* it overflows) the low word of the Adler checksum of such a sequence of
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* length n is equal to n + 1, while the high word is equal to the nth
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* triangular number plus n, i.e. (n*(n+1))/2+n. Also, unlike Fletcher32,
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* the input width for Adler32 is always 8 bits.
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*/
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#define TRIpN(n) ((n * (n + 1) / 2) + n)
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static struct t_case t_cases[] = {
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/* trivial cases */
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{
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.desc = "all-zeroes message",
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.data = t_zero,
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.len = sizeof t_zero,
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.sum = sizeof t_zero << 16 | 0x0001U,
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},
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{
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.desc = "length 0",
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.data = ones8,
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.len = 0,
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.sum = 0x00000001,
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},
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{
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.desc = "squeamish ossifrage",
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.data = "the magic words are squeamish ossifrage",
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.len = 39,
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.sum = 0x23880edd,
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},
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/* overflow */
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{
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.desc = "high overflow - 1",
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.data = ones8,
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.len = 359,
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.sum = (TRIpN(359U) % 65521U) << 16 | 360U,
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},
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{
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.desc = "high overflow",
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.data = ones8,
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.len = 363,
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.sum = (TRIpN(363U) % 65521U) << 16 | 364U,
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},
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{
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.desc = "low overflow - 1",
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.data = ones8,
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.len = 65519,
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.sum = (TRIpN(65519U) % 65521U) << 16 | 65520U,
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},
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{
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.desc = "low overflow",
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.data = ones8,
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.len = 65520,
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.sum = (TRIpN(65520U) % 65521U) << 16 | 0U,
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},
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{
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.desc = "low overflow + 1",
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.data = ones8,
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.len = 65521,
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.sum = ((TRIpN(65520U) + 1) % 65521U) << 16 | 1U,
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},
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};
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/***************************************************************************
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* Test function
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*/
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static int
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t_adler32(char **desc CRYB_UNUSED, void *arg)
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{
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struct t_case *t = arg;
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return (t_compare_x32(t->sum, adler32_hash(t->data, t->len)));
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}
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/***************************************************************************
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* Boilerplate
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*/
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static int
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t_prepare(int argc, char *argv[])
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{
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unsigned int i, n;
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(void)argc;
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(void)argv;
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memset(&ones8, 1, sizeof ones8);
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n = sizeof t_cases / sizeof t_cases[0];
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for (i = 0; i < n; ++i)
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if (t_cases[i].sum != 0xffffffffLU)
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t_add_test(t_adler32, &t_cases[i], "%s",
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t_cases[i].desc);
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return (0);
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}
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int
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main(int argc, char *argv[])
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{
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t_main(t_prepare, NULL, argc, argv);
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}
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