Line data Source code
1 : /* cksum -- calculate and print POSIX checksums and sizes of files
2 : Copyright (C) 92, 1995-2006 Free Software Foundation, Inc.
3 :
4 : This program is free software: you can redistribute it and/or modify
5 : it under the terms of the GNU General Public License as published by
6 : the Free Software Foundation, either version 3 of the License, or
7 : (at your option) any later version.
8 :
9 : This program is distributed in the hope that it will be useful,
10 : but WITHOUT ANY WARRANTY; without even the implied warranty of
11 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 : GNU General Public License for more details.
13 :
14 : You should have received a copy of the GNU General Public License
15 : along with this program. If not, see <http://www.gnu.org/licenses/>. */
16 :
17 : /* Written by Q. Frank Xia, qx@math.columbia.edu.
18 : Cosmetic changes and reorganization by David MacKenzie, djm@gnu.ai.mit.edu.
19 :
20 : Usage: cksum [file...]
21 :
22 : The code segment between "#ifdef CRCTAB" and "#else" is the code
23 : which calculates the "crctab". It is included for those who want
24 : verify the correctness of the "crctab". To recreate the "crctab",
25 : do something like the following:
26 :
27 : cc -DCRCTAB -o crctab cksum.c
28 : crctab > crctab.h
29 :
30 : This software is compatible with neither the System V nor the BSD
31 : `sum' program. It is supposed to conform to POSIX, except perhaps
32 : for foreign language support. Any inconsistency with the standard
33 : (other than foreign language support) is a bug. */
34 :
35 : #include <config.h>
36 :
37 : /* The official name of this program (e.g., no `g' prefix). */
38 : #define PROGRAM_NAME "cksum"
39 :
40 : #define AUTHORS "Q. Frank Xia"
41 :
42 : #include <stdio.h>
43 : #include <sys/types.h>
44 : #include <stdint.h>
45 : #include "system.h"
46 :
47 : #ifdef CRCTAB
48 :
49 : # define BIT(x) ((uint_fast32_t) 1 << (x))
50 : # define SBIT BIT (31)
51 :
52 : /* The generating polynomial is
53 :
54 : 32 26 23 22 16 12 11 10 8 7 5 4 2 1
55 : G(X)=X + X + X + X + X + X + X + X + X + X + X + X + X + X + 1
56 :
57 : The i bit in GEN is set if X^i is a summand of G(X) except X^32. */
58 :
59 : # define GEN (BIT (26) | BIT (23) | BIT (22) | BIT (16) | BIT (12) \
60 : | BIT (11) | BIT (10) | BIT (8) | BIT (7) | BIT (5) \
61 : | BIT (4) | BIT (2) | BIT (1) | BIT (0))
62 :
63 : static uint_fast32_t r[8];
64 :
65 : static void
66 : fill_r (void)
67 : {
68 : int i;
69 :
70 : r[0] = GEN;
71 : for (i = 1; i < 8; i++)
72 : r[i] = (r[i - 1] << 1) ^ ((r[i - 1] & SBIT) ? GEN : 0);
73 : }
74 :
75 : static uint_fast32_t
76 : crc_remainder (int m)
77 : {
78 : uint_fast32_t rem = 0;
79 : int i;
80 :
81 : for (i = 0; i < 8; i++)
82 : if (BIT (i) & m)
83 : rem ^= r[i];
84 :
85 : return rem & 0xFFFFFFFF; /* Make it run on 64-bit machine. */
86 : }
87 :
88 : int
89 : main (void)
90 : {
91 : int i;
92 :
93 : fill_r ();
94 : printf ("static uint_fast32_t const crctab[256] =\n{\n 0x00000000");
95 : for (i = 0; i < 51; i++)
96 : {
97 : printf (",\n 0x%08x, 0x%08x, 0x%08x, 0x%08x, 0x%08x",
98 : crc_remainder (i * 5 + 1), crc_remainder (i * 5 + 2),
99 : crc_remainder (i * 5 + 3), crc_remainder (i * 5 + 4),
100 : crc_remainder (i * 5 + 5));
101 : }
102 : printf ("\n};\n");
103 : exit (EXIT_SUCCESS);
104 : }
105 :
106 : #else /* !CRCTAB */
107 :
108 : # include <getopt.h>
109 : # include "long-options.h"
110 : # include "error.h"
111 : # include "inttostr.h"
112 :
113 : /* Number of bytes to read at once. */
114 : # define BUFLEN (1 << 16)
115 :
116 : /* The name this program was run with. */
117 : char *program_name;
118 :
119 : static uint_fast32_t const crctab[256] =
120 : {
121 : 0x00000000,
122 : 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
123 : 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
124 : 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
125 : 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
126 : 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
127 : 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
128 : 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
129 : 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
130 : 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
131 : 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
132 : 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
133 : 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
134 : 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
135 : 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
136 : 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
137 : 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
138 : 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
139 : 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
140 : 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
141 : 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
142 : 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
143 : 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
144 : 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
145 : 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
146 : 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
147 : 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
148 : 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
149 : 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
150 : 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
151 : 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
152 : 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
153 : 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
154 : 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
155 : 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
156 : 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
157 : 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
158 : 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
159 : 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
160 : 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
161 : 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
162 : 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
163 : 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
164 : 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
165 : 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
166 : 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
167 : 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
168 : 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
169 : 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
170 : 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
171 : 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
172 : 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
173 : };
174 :
175 : /* Nonzero if any of the files read were the standard input. */
176 : static bool have_read_stdin;
177 :
178 : /* Calculate and print the checksum and length in bytes
179 : of file FILE, or of the standard input if FILE is "-".
180 : If PRINT_NAME is true, print FILE next to the checksum and size.
181 : Return true if successful. */
182 :
183 : static bool
184 46 : cksum (const char *file, bool print_name)
185 : {
186 : unsigned char buf[BUFLEN];
187 46 : uint_fast32_t crc = 0;
188 46 : uintmax_t length = 0;
189 : size_t bytes_read;
190 : FILE *fp;
191 : char length_buf[INT_BUFSIZE_BOUND (uintmax_t)];
192 : char const *hp;
193 :
194 46 : if (STREQ (file, "-"))
195 : {
196 29 : fp = stdin;
197 29 : have_read_stdin = true;
198 : if (O_BINARY && ! isatty (STDIN_FILENO))
199 : freopen (NULL, "rb", stdin);
200 : }
201 : else
202 : {
203 17 : fp = fopen (file, (O_BINARY ? "rb" : "r"));
204 17 : if (fp == NULL)
205 : {
206 9 : error (0, errno, "%s", file);
207 9 : return false;
208 : }
209 : }
210 :
211 76 : while ((bytes_read = fread (buf, 1, BUFLEN, fp)) > 0)
212 : {
213 23 : unsigned char *cp = buf;
214 :
215 23 : if (length + bytes_read < length)
216 0 : error (EXIT_FAILURE, 0, _("%s: file too long"), file);
217 23 : length += bytes_read;
218 230 : while (bytes_read--)
219 184 : crc = (crc << 8) ^ crctab[((crc >> 24) ^ *cp++) & 0xFF];
220 23 : if (feof (fp))
221 21 : break;
222 : }
223 :
224 37 : if (ferror (fp))
225 : {
226 6 : error (0, errno, "%s", file);
227 6 : if (!STREQ (file, "-"))
228 6 : fclose (fp);
229 6 : return false;
230 : }
231 :
232 31 : if (!STREQ (file, "-") && fclose (fp) == EOF)
233 : {
234 0 : error (0, errno, "%s", file);
235 0 : return false;
236 : }
237 :
238 31 : hp = umaxtostr (length, length_buf);
239 :
240 52 : for (; length; length >>= 8)
241 21 : crc = (crc << 8) ^ crctab[((crc >> 24) ^ length) & 0xFF];
242 :
243 31 : crc = ~crc & 0xFFFFFFFF;
244 :
245 31 : if (print_name)
246 29 : printf ("%u %s %s\n", (unsigned int) crc, hp, file);
247 : else
248 2 : printf ("%u %s\n", (unsigned int) crc, hp);
249 :
250 31 : if (ferror (stdout))
251 0 : error (EXIT_FAILURE, errno, "-: %s", _("write error"));
252 :
253 31 : return true;
254 : }
255 :
256 : void
257 7 : usage (int status)
258 : {
259 7 : if (status != EXIT_SUCCESS)
260 5 : fprintf (stderr, _("Try `%s --help' for more information.\n"),
261 : program_name);
262 : else
263 : {
264 2 : printf (_("\
265 : Usage: %s [FILE]...\n\
266 : or: %s [OPTION]\n\
267 : "),
268 : program_name, program_name);
269 2 : fputs (_("\
270 : Print CRC checksum and byte counts of each FILE.\n\
271 : \n\
272 : "), stdout);
273 2 : fputs (HELP_OPTION_DESCRIPTION, stdout);
274 2 : fputs (VERSION_OPTION_DESCRIPTION, stdout);
275 2 : emit_bug_reporting_address ();
276 : }
277 7 : exit (status);
278 : }
279 :
280 : int
281 31 : main (int argc, char **argv)
282 : {
283 : int i;
284 : bool ok;
285 :
286 : initialize_main (&argc, &argv);
287 31 : program_name = argv[0];
288 31 : setlocale (LC_ALL, "");
289 : bindtextdomain (PACKAGE, LOCALEDIR);
290 : textdomain (PACKAGE);
291 :
292 31 : atexit (close_stdout);
293 :
294 31 : parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE, VERSION,
295 : usage, AUTHORS, (char const *) NULL);
296 28 : if (getopt_long (argc, argv, "", NULL, NULL) != -1)
297 5 : usage (EXIT_FAILURE);
298 :
299 23 : have_read_stdin = false;
300 :
301 23 : if (optind == argc)
302 2 : ok = cksum ("-", false);
303 : else
304 : {
305 21 : ok = true;
306 65 : for (i = optind; i < argc; i++)
307 44 : ok &= cksum (argv[i], true);
308 : }
309 :
310 23 : if (have_read_stdin && fclose (stdin) == EOF)
311 0 : error (EXIT_FAILURE, errno, "-");
312 23 : exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
313 : }
314 :
315 : #endif /* !CRCTAB */
|
