Mercurial > hg > wm
annotate Meerwald/gen_cox_sig.c @ 21:1c4ccd635a68 v0.6
ignore *.swp
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Sat, 28 Jan 2023 23:57:40 +0100 |
| parents | 4987db85cfae |
| children |
| rev | line source |
|---|---|
| 0 | 1 #include "wm.h" |
| 2 | |
| 3 char *progname; | |
| 4 | |
| 5 void usage(void) { | |
| 6 fprintf(stderr, "usage: %s [-a n] [-d n] [-m n] [-n n] [-o file] [-s file] [-S n]\n\n", progname); | |
| 7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.3)\n"); | |
| 8 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n"); | |
| 9 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 10 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n"); | |
| 11 fprintf(stderr, "\t-n n\t\twatermark length (default 100)\n"); | |
| 12 fprintf(stderr, "\t-o file\t\toutput file\n"); | |
| 13 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n"); | |
| 14 fprintf(stderr, "\t-S n\t\tseed\n"); | |
| 15 exit(0); | |
| 16 } | |
| 17 | |
| 18 int main(int argc, char *argv[]) { | |
| 19 FILE *out = stdout; | |
| 20 FILE *sig = NULL; | |
| 21 | |
| 22 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 23 char signature_name[MAXPATHLEN]; | |
| 24 | |
| 25 int c; | |
| 26 int n = 100; | |
| 27 int s = 0; | |
| 28 double a = 0.3; | |
| 29 double m = 0.0; | |
| 30 double d = 1.0; | |
| 31 | |
| 32 progname = argv[0]; | |
| 33 | |
| 34 while ((c = getopt(argc, argv, "a:d:h?m:n:o:s:S:")) != EOF) { | |
| 35 switch (c) { | |
| 36 case 'a': | |
| 37 a = atof(optarg); | |
| 38 if (a <= 0.0) { | |
| 39 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a); | |
| 40 exit(1); | |
| 41 } | |
| 42 break; | |
| 43 case 'd': | |
| 44 d = atof(optarg); | |
| 45 if (d <= 0.0) { | |
| 46 fprintf(stderr, "%s: deviation %f out of range\n", progname, d); | |
| 47 exit(1); | |
| 48 } | |
| 49 break; | |
| 50 case 'h': | |
| 51 case '?': | |
| 52 usage(); | |
| 53 break; | |
| 54 case 'm': | |
| 55 m = atof(optarg); | |
| 56 break; | |
| 57 case 'n': | |
| 58 n = atoi(optarg); | |
| 59 if (n < 1 || n > 32000) { | |
| 60 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n); | |
| 61 exit(1); | |
| 62 } | |
| 63 break; | |
| 64 case 'o': | |
| 65 if ((out = fopen(optarg, "w")) == NULL) { | |
| 66 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 67 exit(1); | |
| 68 } | |
| 69 strcpy(output_name, optarg); | |
| 70 break; | |
| 71 case 's': | |
| 72 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 73 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 74 exit(1); | |
| 75 } | |
| 76 strcpy(signature_name, optarg); | |
| 77 break; | |
| 78 case 'S': | |
| 79 s = atoi(optarg); | |
| 80 break; | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 argc -= optind; | |
| 85 argv += optind; | |
| 86 | |
| 87 if (argc > 0) { | |
| 88 usage(); | |
| 89 exit(1); | |
| 90 } | |
| 91 | |
| 92 if (sig) { | |
| 93 char line[32]; | |
| 94 fgets(line, sizeof(line), sig); | |
| 95 if (strspn(line, "CXSG") >= 4) { | |
| 96 if (n == 0) | |
| 97 fscanf(sig, "%d\n", &n); | |
| 98 else | |
| 99 fscanf(sig, "%*d\n"); | |
| 100 if (a == 0.0) | |
| 101 fscanf(sig, "%lf\n", &a); | |
| 102 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
103 fscanf(sig, "%*f\n"); |
| 0 | 104 if (m == 0.0) |
| 105 fscanf(sig, "%lf\n", &m); | |
| 106 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
107 fscanf(sig, "%*f\n"); |
| 0 | 108 if (d == 0.0) |
| 109 fscanf(sig, "%lf\n", &d); | |
| 110 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
111 fscanf(sig, "%*f\n"); |
| 0 | 112 } |
| 113 else { | |
| 114 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 115 exit(1); | |
| 116 } | |
| 8 | 117 fclose(sig); |
| 0 | 118 } |
| 119 | |
| 120 if (s) | |
| 121 srandom(s); | |
| 122 else | |
| 123 srandom(time(NULL) * getpid()); | |
| 124 | |
| 125 fprintf(out, "CXSG\n"); | |
| 126 fprintf(out, "%d\n", n); | |
| 127 fprintf(out, "%f\n", a); | |
| 128 fprintf(out, "%f\n", m); | |
| 129 fprintf(out, "%f\n", d); | |
| 130 | |
| 131 n >>= 1; | |
| 132 while (n > 0) { | |
| 133 double x; | |
| 134 double x1, x2; | |
| 135 | |
| 136 /* | |
| 137 * Algorithm P (Polar method for normal deviates), | |
| 138 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122 | |
| 139 */ | |
| 140 do { | |
| 141 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0; | |
| 142 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0; | |
| 143 x = x1 * x1 + x2 * x2; | |
| 144 } while (x >= 1.0); | |
| 145 x1 *= sqrt((-2.0) * log(x) / x); | |
| 146 x2 *= sqrt((-2.0) * log(x) / x); | |
| 147 | |
| 148 fprintf(out, "%f\n", m + d * x1); | |
| 149 fprintf(out, "%f\n", m + d * x2); | |
| 150 | |
| 151 n--; | |
| 152 } | |
| 153 | |
| 154 fclose(out); | |
| 155 | |
| 156 exit(0); | |
| 157 } |