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comparison Meerwald-dir/gen_wang_sig.c @ 24:9f20bce6184e v0.7

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move directories, support netpbm 11
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/gen_wang_sig.c@4987db85cfae
children
comparison
equal deleted inserted replaced
23:71dd4b96221b 24:9f20bce6184e
1 #include "wm.h"
2
3 char *progname;
4
5 void usage(void) {
6 fprintf(stderr, "usage: %s [-a n] [-b n] [-d n] [-e n] [-f n] [-F file] [-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-b n\t\tbeta factor (default 1.0)\n");
9 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n");
10 fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
11 fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
12 fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
13 fprintf(stderr, "\t-h\t\tprint usage\n");
14 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
15 fprintf(stderr, "\t-n n\t\twatermark length (default 1000)\n");
16 fprintf(stderr, "\t-o file\t\toutput file\n");
17 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
18 fprintf(stderr, "\t-S n\t\tseed\n");
19 exit(0);
20 }
21
22 int main(int argc, char *argv[]) {
23 FILE *out = stdout;
24 FILE *sig = NULL;
25
26 char output_name[MAXPATHLEN] = "(stdout)";
27 char signature_name[MAXPATHLEN];
28
29 int c;
30 int n = 1000;
31 int s = 0;
32 int e = 2;
33 int f = 1;
34 char F[MAXPATHLEN] = "filter.dat";
35 double a = 0.3;
36 double b = 1.0;
37 double m = 0.0;
38 double d = 1.0;
39
40 progname = argv[0];
41
42 while ((c = getopt(argc, argv, "a:b:d:e:f:F:h?m:n:o:s:S:")) != EOF) {
43 switch (c) {
44 case 'a':
45 a = atof(optarg);
46 if (a <= 0.0) {
47 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
48 exit(1);
49 }
50 break;
51 case 'b':
52 b = atof(optarg);
53 if (b <= 0.0) {
54 fprintf(stderr, "%s: beta factor %f out of range\n", progname, b);
55 exit(1);
56 }
57 break;
58 case 'd':
59 d = atof(optarg);
60 if (d <= 0.0) {
61 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
62 exit(1);
63 }
64 break;
65 case 'e':
66 e = atoi(optarg);
67 if (e < 0) {
68 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
69 }
70 break;
71 case 'f':
72 f = atoi(optarg);
73 if (f <= 0) {
74 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
75 exit(1);
76 }
77 break;
78 case 'F':
79 strcpy(F, optarg);
80 break;
81 case 'h':
82 case '?':
83 usage();
84 break;
85 case 'm':
86 m = atof(optarg);
87 break;
88 case 'n':
89 n = atoi(optarg);
90 if (n < 1 || n > 32000) {
91 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
92 exit(1);
93 }
94 break;
95 case 'o':
96 if ((out = fopen(optarg, "w")) == NULL) {
97 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
98 exit(1);
99 }
100 strcpy(output_name, optarg);
101 break;
102 case 's':
103 if ((sig = fopen(optarg, "r")) == NULL) {
104 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
105 exit(1);
106 }
107 strcpy(signature_name, optarg);
108 break;
109 case 'S':
110 s = atoi(optarg);
111 break;
112 }
113 }
114
115 argc -= optind;
116 argv += optind;
117
118 if (argc > 0) {
119 usage();
120 exit(1);
121 }
122
123 if (sig) {
124 char line[32];
125 fgets(line, sizeof(line), sig);
126 if (strspn(line, "WGSG") >= 4) {
127 if (n == 0)
128 fscanf(sig, "%d\n", &n);
129 else
130 fscanf(sig, "%*d\n");
131 if (a == 0.0)
132 fscanf(sig, "%lf\n", &a);
133 else
134 fscanf(sig, "%*f\n");
135 if (b == 0.0)
136 fscanf(sig, "%lf\n", &b);
137 else
138 fscanf(sig, "%*f\n");
139 if (e < 0)
140 fscanf(sig, "%d\n", &e);
141 else
142 fscanf(sig, "%*d\n");
143 if (f == 0)
144 fscanf(sig, "%d\n", &f);
145 else
146 fscanf(sig, "%*d\n");
147 if (!strcmp(F, ""))
148 fscanf(sig, "%[^\n\r]\n", F);
149 else
150 fscanf(sig, "%*[^\n\r]\n");
151 }
152 else {
153 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
154 exit(1);
155 }
156 }
157
158 if (s)
159 srandom(s);
160 else
161 srandom(time(NULL) * getpid());
162
163 fprintf(out, "WGSG\n");
164 fprintf(out, "%d\n", n);
165 fprintf(out, "%f\n", a);
166 fprintf(out, "%f\n", b);
167 fprintf(out, "%d\n", e);
168 fprintf(out, "%d\n", f);
169 fprintf(out, "%s\n", F);
170
171 n >>= 1;
172 while (n > 0) {
173 double x;
174 double x1, x2;
175
176 /*
177 * Algorithm P (Polar method for normal deviates),
178 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
179 */
180 do {
181 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
182 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
183 x = x1 * x1 + x2 * x2;
184 } while (x >= 1.0);
185 x1 *= sqrt((-2.0) * log(x) / x);
186 x2 *= sqrt((-2.0) * log(x) / x);
187
188 fprintf(out, "%f\n", m + d * x1);
189 fprintf(out, "%f\n", m + d * x2);
190
191 n--;
192 }
193
194 fclose(out);
195
196 exit(0);
197 }

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