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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 n = 1000;
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27 int s = 0;
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28 int e = 2;
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29 int f = 1;
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30 char F[MAXPATHLEN] = "filter.dat";
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31 double a = 0.1;
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32 double m = 0.0;
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33 double d = 1.0;
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34
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35 progname = argv[0];
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36
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37 while ((c = getopt(argc, argv, "a:d:e:f:F:h?m:n:o:s:")) != EOF) {
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38 switch (c) {
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39 case 'a':
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40 a = atof(optarg);
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41 if (a <= 0.0) {
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42 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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43 exit(1);
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44 }
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45 break;
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46 case 'd':
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47 d = atof(optarg);
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48 if (d <= 0.0) {
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49 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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50 exit(1);
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51 }
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52 break;
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53 case 'e':
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54 e = atoi(optarg);
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55 if (e < 0) {
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56 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
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57 }
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58 break;
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59 case 'f':
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60 f = atoi(optarg);
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61 if (f <= 0) {
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62 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
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63 exit(1);
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64 }
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65 break;
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66 case 'F':
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67 strcpy(F, optarg);
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68 break;
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69 case 'h':
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70 case '?':
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71 usage();
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72 break;
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73 case 'm':
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74 m = atof(optarg);
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75 break;
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76 case 'n':
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77 n = atoi(optarg);
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78 if (n < 1 || n > 32000) {
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79 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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80 exit(1);
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81 }
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82 break;
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83 case 'o':
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84 if ((out = fopen(optarg, "w")) == NULL) {
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85 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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86 exit(1);
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87 }
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88 strcpy(output_name, optarg);
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89 break;
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90 case 's':
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91 s = atoi(optarg);
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92 break;
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93 }
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94 }
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95
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96 argc -= optind;
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97 argv += optind;
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98
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99 if (argc > 0) {
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100 usage();
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101 exit(1);
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102 }
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103
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104 if (s)
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105 srandom(s);
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106 else
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107 srandom(time(NULL) * getpid());
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108
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109 fprintf(out, "CVSG\n");
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110 fprintf(out, "%d\n", n);
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111 fprintf(out, "%f\n", a);
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112 fprintf(out, "%d\n", e);
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113 fprintf(out, "%d\n", f);
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114 fprintf(out, "%s\n", F);
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115
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116 n >>= 1;
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117 while (n > 0) {
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118 double x;
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119 double x1, x2;
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120
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121 /*
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122 * Algorithm P (Polar method for normal deviates),
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123 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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124 */
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125 do {
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126 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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127 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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128 x = x1 * x1 + x2 * x2;
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129 } while (x >= 1.0);
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130 x1 *= sqrt((-2.0) * log(x) / x);
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131 x2 *= sqrt((-2.0) * log(x) / x);
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132
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133 fprintf(out, "%f\n", m + d * x1);
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134 fprintf(out, "%f\n", m + d * x2);
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135
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136 n--;
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137 }
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138
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139 fclose(out);
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140
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141 exit(0);
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142 }
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