source: liacs/alg/solitaire/crc/Tst_crc.c@ 92

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[2]1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4
5#include "lib_crc.h"
6
7
8
9 /*******************************************************************\
10 * *
11 * Library : lib_crc *
12 * File : tst_crc.c *
13 * Author : Lammert Bies 1999-2005 *
14 * E-mail : info@lammertbies.nl *
15 * Language : ANSI C *
16 * *
17 * *
18 * Description *
19 * =========== *
20 * *
21 * The file tst_crc.c contains a small sample program which *
22 * demonstrates the use of the functions for calculating the *
23 * CRC-CCITT, CRC-16 and CRC-32 values of data. The file cal- *
24 * culates the three different CRC's for a file who's name is *
25 * either provided at the command line, or typed in right *
26 * after the program has started. *
27 * *
28 * *
29 * Dependencies *
30 * ============ *
31 * *
32 * lib_crc.h CRC definitions and prototypes *
33 * lib_crc.c CRC routines *
34 * *
35 * *
36 * Modification history *
37 * ==================== *
38 * *
39 * Date Version Comment *
40 * *
41 * 2005-02-14 1.12 Added CRC-CCITT with initial value 0. *
42 * *
43 * 2005-02-05 1.11 Fixed post processing bug in CRC-DNP. *
44 * *
45 * 2005-02-04 1.10 Added the CRC calculation for DNP 3.0, *
46 * a protocol used in the communication *
47 * between remote units and masters in the *
48 * electric utility industry. The method *
49 * of calculation is the same as CRC-16, *
50 * but with a different polynomial. *
51 * *
52 * 2005-01-07 1.02 Changed way program is used. When a *
53 * commandline parameter is present, the *
54 * program assumes it is a file, but when *
55 * invoked without a parameter the entered *
56 * string is used to calculate the CRC. *
57 * *
58 * CRC's are now printed in hexadecimal *
59 * decimal format. *
60 * *
61 * Let CRC-CCITT calculation start with *
62 * 0xffff as this is used in most imple- *
63 * mentations. *
64 * *
65 * 1999-02-21 1.01 none *
66 * *
67 * 1999-01-22 1.00 Initial source *
68 * *
69 \*******************************************************************/
70
71#define MAX_STRING_SIZE 2048
72
73
74
75int main( int argc, char *argv[] ) {
76
77 char input_string[MAX_STRING_SIZE];
78 char *ptr, *dest, hex_val;
79 unsigned short crc_16, crc_ccitt_ffff, crc_ccitt_0000, crc_dnp, low_byte, high_byte;
80 unsigned long crc_32;
81 int a, ch, do_ascii, do_hex;
82 FILE *fp;
83
84 do_ascii = FALSE;
85 do_hex = FALSE;
86
87 printf( "\nCRC algorithm sample program\nLammert Bies, Version " CRC_VERSION "\n\n" );
88
89 if ( argc < 2 ) {
90
91 printf( "Usage: tst_crc [-a|-x] file1 ...\n\n" );
92 printf( " -a Program asks for ASCII input. Following parameters ignored.\n" );
93 printf( " -x Program asks for hexadecimal input. Following parameters ignored.\n" );
94 printf( " All other parameters are treated like filenames. The CRC values\n" );
95 printf( " for each separate file will be calculated.\n" );
96
97 exit( 0 );
98 }
99
100 if ( ! strcmp( argv[1], "-a" ) || ! strcmp( argv[1], "-A" ) ) do_ascii = TRUE;
101 if ( ! strcmp( argv[1], "-x" ) || ! strcmp( argv[1], "-X" ) ) do_hex = TRUE;
102
103 if ( do_ascii || do_hex ) {
104
105 printf( "Input: " );
106 fgets( input_string, MAX_STRING_SIZE-1, stdin );
107 }
108
109 if ( do_ascii ) {
110
111 ptr = input_string;
112 while ( *ptr && *ptr != '\r' && *ptr != '\n' ) ptr++;
113 *ptr = 0;
114 }
115
116 if ( do_hex ) {
117
118 ptr = input_string;
119 dest = input_string;
120
121 while( *ptr && *ptr != '\r' && *ptr != '\n' ) {
122
123 if ( *ptr >= '0' && *ptr <= '9' ) *dest++ = (char) ( (*ptr) - '0' );
124 if ( *ptr >= 'A' && *ptr <= 'F' ) *dest++ = (char) ( (*ptr) - 'A' + 10 );
125 if ( *ptr >= 'a' && *ptr <= 'f' ) *dest++ = (char) ( (*ptr) - 'a' + 10 );
126
127 ptr++;
128 }
129
130 * dest = '\x80';
131 *(dest+1) = '\x80';
132 }
133
134
135
136 a = 1;
137
138 do {
139
140 crc_16 = 0;
141 crc_dnp = 0;
142 crc_ccitt_0000 = 0;
143 crc_ccitt_ffff = 0xffff;
144 crc_32 = 0xffffffffL;
145
146
147
148 if ( do_ascii ) {
149
150 ptr = input_string;
151
152 while ( *ptr ) {
153
154 crc_16 = update_crc_16( crc_16, *ptr );
155 crc_dnp = update_crc_dnp( crc_dnp, *ptr );
156 crc_ccitt_0000 = update_crc_ccitt( crc_ccitt_0000, *ptr );
157 crc_ccitt_ffff = update_crc_ccitt( crc_ccitt_ffff, *ptr );
158 crc_32 = update_crc_32( crc_32, *ptr );
159
160 ptr++;
161 }
162 }
163
164
165
166 else if ( do_hex ) {
167
168 ptr = input_string;
169
170 while ( *ptr != '\x80' ) {
171
172 hex_val = (char) ( ( * ptr & '\x0f' ) << 4 );
173 hex_val |= (char) ( ( *(ptr+1) & '\x0f' ) );
174
175 crc_16 = update_crc_16( crc_16, hex_val );
176 crc_dnp = update_crc_dnp( crc_dnp, hex_val );
177 crc_ccitt_0000 = update_crc_ccitt( crc_ccitt_0000, hex_val );
178 crc_ccitt_ffff = update_crc_ccitt( crc_ccitt_ffff, hex_val );
179 crc_32 = update_crc_32( crc_32, hex_val );
180
181 ptr += 2;
182 }
183
184 input_string[0] = 0;
185 }
186
187
188
189 else {
190
191 fp = fopen( argv[a], "rb" );
192
193 if ( fp != NULL ) {
194
195 while( ( ch=fgetc( fp ) ) != EOF ) {
196
197 crc_16 = update_crc_16( crc_16, (char) ch );
198 crc_dnp = update_crc_dnp( crc_dnp, (char) ch );
199 crc_ccitt_0000 = update_crc_ccitt( crc_ccitt_0000, (char) ch );
200 crc_ccitt_ffff = update_crc_ccitt( crc_ccitt_ffff, (char) ch );
201 crc_32 = update_crc_32( crc_32, (char) ch );
202 }
203
204 fclose( fp );
205 }
206
207 else printf( "%s : cannot open file\n", argv[a] );
208 }
209
210
211
212 crc_32 ^= 0xffffffffL;
213
214 crc_dnp = ~crc_dnp;
215 low_byte = (crc_dnp & 0xff00) >> 8;
216 high_byte = (crc_dnp & 0x00ff) << 8;
217 crc_dnp = low_byte | high_byte;
218
219
220 printf( "%s%s%s :\nCRC16 = 0x%04X / %u\n"
221 "CRC-CCITT (0x0000) = 0x%04X / %u\n"
222 "CRC-CCITT (0xffff) = 0x%04X / %u\n"
223 "CRC-DNP = 0x%04X / %u\n"
224 "CRC32 = 0x%08lX / %lu\n"
225 , ( do_ascii || do_hex ) ? "\"" : ""
226 , ( ! do_ascii && ! do_hex ) ? argv[a] : input_string
227 , ( do_ascii || do_hex ) ? "\"" : ""
228 , crc_16, crc_16
229 , crc_ccitt_0000, crc_ccitt_0000
230 , crc_ccitt_ffff, crc_ccitt_ffff
231 , crc_dnp, crc_dnp
232 , crc_32, crc_32 );
233
234 a++;
235
236 } while ( a < argc );
237
238} /* main (tst_crc.c) */
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