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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] [-m n] [-n n] [-o file] [-s file] [-S n]\n\n", progname);
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7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.3)\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-h\t\tprint usage\n");
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10 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
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11 fprintf(stderr, "\t-n n\t\twatermark length (default 100)\n");
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12 fprintf(stderr, "\t-o file\t\toutput file\n");
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13 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
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14 fprintf(stderr, "\t-S n\t\tseed\n");
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15 exit(0);
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16 }
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17
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18 int main(int argc, char *argv[]) {
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19 FILE *out = stdout;
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20 FILE *sig = NULL;
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21
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22 char output_name[MAXPATHLEN] = "(stdout)";
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23 char signature_name[MAXPATHLEN];
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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 = 100;
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28 int s = 0;
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29 double a = 0.3;
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30 double m = 0.0;
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31 double d = 1.0;
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32
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33 progname = argv[0];
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34
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35 while ((c = getopt(argc, argv, "a:d:h?m:n:o:s:S:")) != EOF) {
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36 switch (c) {
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37 case 'a':
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38 a = atof(optarg);
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39 if (a <= 0.0) {
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40 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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41 exit(1);
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42 }
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43 break;
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44 case 'd':
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45 d = atof(optarg);
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46 if (d <= 0.0) {
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47 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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48 exit(1);
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49 }
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50 break;
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51 case 'h':
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52 case '?':
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53 usage();
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54 break;
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55 case 'm':
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56 m = atof(optarg);
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57 break;
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58 case 'n':
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59 n = atoi(optarg);
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60 if (n < 1 || n > 32000) {
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61 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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62 exit(1);
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63 }
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64 break;
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65 case 'o':
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66 if ((out = fopen(optarg, "w")) == NULL) {
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67 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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68 exit(1);
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69 }
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70 strcpy(output_name, optarg);
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71 break;
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72 case 's':
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73 if ((sig = fopen(optarg, "r")) == NULL) {
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74 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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75 exit(1);
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76 }
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77 strcpy(signature_name, optarg);
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78 break;
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79 case 'S':
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80 s = atoi(optarg);
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81 break;
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82 }
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83 }
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84
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85 argc -= optind;
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86 argv += optind;
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87
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88 if (argc > 0) {
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89 usage();
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90 exit(1);
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91 }
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92
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93 if (sig) {
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94 char line[32];
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95 fgets(line, sizeof(line), sig);
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96 if (strspn(line, "CXSG") >= 4) {
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97 if (n == 0)
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98 fscanf(sig, "%d\n", &n);
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99 else
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100 fscanf(sig, "%*d\n");
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101 if (a == 0.0)
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102 fscanf(sig, "%lf\n", &a);
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103 else
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104 fscanf(sig, "%*lf\n");
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105 if (m == 0.0)
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106 fscanf(sig, "%lf\n", &m);
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107 else
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108 fscanf(sig, "%*lf\n");
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109 if (d == 0.0)
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110 fscanf(sig, "%lf\n", &d);
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111 else
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112 fscanf(sig, "%*lf\n");
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113 }
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114 else {
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115 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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116 exit(1);
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117 }
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118 close(sig);
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119 }
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120
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121 if (s)
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122 srandom(s);
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123 else
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124 srandom(time(NULL) * getpid());
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125
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126 fprintf(out, "CXSG\n");
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127 fprintf(out, "%d\n", n);
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128 fprintf(out, "%f\n", a);
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129 fprintf(out, "%f\n", m);
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130 fprintf(out, "%f\n", d);
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131
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132 n >>= 1;
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133 while (n > 0) {
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134 double x;
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135 double x1, x2;
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136
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137 /*
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138 * Algorithm P (Polar method for normal deviates),
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139 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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140 */
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141 do {
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142 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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143 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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144 x = x1 * x1 + x2 * x2;
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145 } while (x >= 1.0);
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146 x1 *= sqrt((-2.0) * log(x) / x);
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147 x2 *= sqrt((-2.0) * log(x) / x);
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148
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149 fprintf(out, "%f\n", m + d * x1);
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150 fprintf(out, "%f\n", m + d * x2);
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151
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152 n--;
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153 }
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154
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155 fclose(out);
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156
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157 exit(0);
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158 }
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