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1 #include "wm.h"
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2
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3 char *progname;
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4
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5 void usage(void) {
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6 fprintf(stderr, "usage: %s [-a n] [-d n] [-e n] [-f n] [-F file] [-m n] [-n n] [-o file] [-s n]\n\n", progname);
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7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.1)\n");
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8 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n");
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9 fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
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10 fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
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11 fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
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12 fprintf(stderr, "\t-h\t\tprint usage\n");
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13 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
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14 fprintf(stderr, "\t-n n\t\twatermark length (default 1000)\n");
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15 fprintf(stderr, "\t-o file\t\toutput file\n");
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16 fprintf(stderr, "\t-s n\t\tseed\n");
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17 exit(0);
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18 }
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19
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20 int main(int argc, char *argv[]) {
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21 FILE *out = stdout;
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22
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23 char output_name[MAXPATHLEN] = "(stdout)";
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24
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25 int c;
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26 int i;
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27 int n = 1000;
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28 int s = 0;
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29 int e = 2;
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30 int f = 1;
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31 char F[MAXPATHLEN] = "filter.dat";
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32 double a = 0.1;
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33 double m = 0.0;
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34 double d = 1.0;
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35
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36 progname = argv[0];
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37
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38 while ((c = getopt(argc, argv, "a:d:e:f:F:h?m:n:o:s:")) != EOF) {
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39 switch (c) {
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40 case 'a':
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41 a = atof(optarg);
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42 if (a <= 0.0) {
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43 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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44 exit(1);
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45 }
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46 break;
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47 case 'd':
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48 d = atof(optarg);
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49 if (d <= 0.0) {
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50 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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51 exit(1);
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52 }
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53 break;
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54 case 'e':
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55 e = atoi(optarg);
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56 if (e < 0) {
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57 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
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58 }
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59 break;
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60 case 'f':
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61 f = atoi(optarg);
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62 if (f <= 0) {
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63 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
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64 exit(1);
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65 }
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66 break;
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67 case 'F':
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68 strcpy(F, optarg);
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69 break;
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70 case 'h':
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71 case '?':
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72 usage();
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73 break;
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74 case 'm':
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75 m = atof(optarg);
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76 break;
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77 case 'n':
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78 n = atoi(optarg);
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79 if (n < 1 || n > 32000) {
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80 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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81 exit(1);
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82 }
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83 break;
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84 case 'o':
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85 if ((out = fopen(optarg, "w")) == NULL) {
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86 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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87 exit(1);
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88 }
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89 strcpy(output_name, optarg);
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90 break;
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91 case 's':
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92 s = atoi(optarg);
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93 break;
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94 }
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95 }
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96
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97 argc -= optind;
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98 argv += optind;
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99
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100 if (argc > 0) {
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101 usage();
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102 exit(1);
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103 }
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104
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105 if (s)
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106 srandom(s);
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107 else
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108 srandom(time(NULL) * getpid());
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109
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110 fprintf(out, "CVSG\n");
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111 fprintf(out, "%d\n", n);
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112 fprintf(out, "%f\n", a);
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113 fprintf(out, "%d\n", e);
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114 fprintf(out, "%d\n", f);
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115 fprintf(out, "%s\n", F);
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116
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117 n >>= 1;
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118 while (n > 0) {
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119 double x;
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120 double x1, x2;
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121
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122 /*
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123 * Algorithm P (Polar method for normal deviates),
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124 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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125 */
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126 do {
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127 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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128 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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129 x = x1 * x1 + x2 * x2;
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130 } while (x >= 1.0);
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131 x1 *= sqrt((-2.0) * log(x) / x);
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132 x2 *= sqrt((-2.0) * log(x) / x);
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133
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134 fprintf(out, "%f\n", m + d * x1);
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135 fprintf(out, "%f\n", m + d * x2);
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136
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137 n--;
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138 }
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139
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140 fclose(out);
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141
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142 exit(0);
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143 }
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