Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/tests/crc_tests.c @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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1 /* | |
2 * SpanDSP - a series of DSP components for telephony | |
3 * | |
4 * crc_tests.c | |
5 * | |
6 * Written by Steve Underwood <steveu@coppice.org> | |
7 * | |
8 * Copyright (C) 2003 Steve Underwood | |
9 * | |
10 * All rights reserved. | |
11 * | |
12 * This program is free software; you can redistribute it and/or modify | |
13 * it under the terms of the GNU General Public License version 2, as | |
14 * published by the Free Software Foundation. | |
15 * | |
16 * This program is distributed in the hope that it will be useful, | |
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 * GNU General Public License for more details. | |
20 * | |
21 * You should have received a copy of the GNU General Public License | |
22 * along with this program; if not, write to the Free Software | |
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 * | |
25 * $Id: crc_tests.c,v 1.6 2008/05/13 13:17:25 steveu Exp $ | |
26 */ | |
27 | |
28 /*! \file */ | |
29 | |
30 /*! \page crc_tests_page CRC tests | |
31 \section crc_tests_page_sec_1 What does it do? | |
32 The CRC tests exercise the ITU-16 and ITU-32 CRC module, and verifies | |
33 correct operation. | |
34 */ | |
35 | |
36 #if defined(HAVE_CONFIG_H) | |
37 #include "config.h" | |
38 #endif | |
39 | |
40 #include <stdio.h> | |
41 #include <stdlib.h> | |
42 #include <string.h> | |
43 | |
44 #include "spandsp.h" | |
45 | |
46 int ref_len; | |
47 uint8_t buf[1000]; | |
48 | |
49 /* Use a local random generator, so the results are consistent across platforms. We have hard coded | |
50 correct results for a message sequence generated by this particular PRNG. */ | |
51 static int my_rand(void) | |
52 { | |
53 static int rndnum = 1234567; | |
54 | |
55 return (rndnum = 1664525U*rndnum + 1013904223U) >> 8; | |
56 } | |
57 /*- End of function --------------------------------------------------------*/ | |
58 | |
59 static int cook_up_msg(uint8_t *buf) | |
60 { | |
61 int i; | |
62 int len; | |
63 | |
64 /* Use medium length messages, with some randomised length variation. */ | |
65 /* TODO: this doesn't exercise extremely short or long messages. */ | |
66 len = (my_rand() & 0x3F) + 100; | |
67 for (i = 0; i < len; i++) | |
68 buf[i] = my_rand(); | |
69 return len; | |
70 } | |
71 /*- End of function --------------------------------------------------------*/ | |
72 | |
73 int main(int argc, char *argv[]) | |
74 { | |
75 int i; | |
76 int len; | |
77 | |
78 printf("HDLC module tests\n"); | |
79 | |
80 /* TODO: This doesn't check every function in the module */ | |
81 | |
82 /* Try a few random messages through the CRC logic. */ | |
83 printf("Testing the CRC-16 routines\n"); | |
84 for (i = 0; i < 100; i++) | |
85 { | |
86 ref_len = cook_up_msg(buf); | |
87 len = crc_itu16_append(buf, ref_len); | |
88 if (!crc_itu16_check(buf, len)) | |
89 { | |
90 printf("CRC-16 failure\n"); | |
91 exit(2); | |
92 } | |
93 } | |
94 printf("Test passed.\n\n"); | |
95 | |
96 printf("Testing the CRC-32 routines\n"); | |
97 for (i = 0; i < 100; i++) | |
98 { | |
99 ref_len = cook_up_msg(buf); | |
100 len = crc_itu32_append(buf, ref_len); | |
101 if (!crc_itu32_check(buf, len)) | |
102 { | |
103 printf("CRC-32 failure\n"); | |
104 exit(2); | |
105 } | |
106 } | |
107 printf("Test passed.\n"); | |
108 return 0; | |
109 } | |
110 /*- End of function --------------------------------------------------------*/ | |
111 /*- End of file ------------------------------------------------------------*/ |