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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] [-b n] [-d n] [-e n] [-f n] [-F file] [-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-b n\t\tbeta factor (default 1.0)\n");
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9 fprintf(stderr, "\t-d n\t\tdeviation (default 1.0)\n");
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10 fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
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11 fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
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12 fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
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13 fprintf(stderr, "\t-h\t\tprint usage\n");
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14 fprintf(stderr, "\t-m n \t\tmean value (default 0.0)\n");
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15 fprintf(stderr, "\t-n n\t\twatermark length (default 1000)\n");
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16 fprintf(stderr, "\t-o file\t\toutput file\n");
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17 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
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18 fprintf(stderr, "\t-S n\t\tseed\n");
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19 exit(0);
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20 }
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21
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22 int main(int argc, char *argv[]) {
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23 FILE *out = stdout;
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24 FILE *sig = NULL;
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25
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26 char output_name[MAXPATHLEN] = "(stdout)";
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27 char signature_name[MAXPATHLEN];
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28
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29 int c;
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30 int i;
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31 int n = 1000;
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32 int s = 0;
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33 int e = 2;
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34 int f = 1;
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35 char F[MAXPATHLEN] = "filter.dat";
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36 double a = 0.3;
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37 double b = 1.0;
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38 double m = 0.0;
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39 double d = 1.0;
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40
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41 progname = argv[0];
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42
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43 while ((c = getopt(argc, argv, "a:b:d:e:f:F:h?m:n:o:s:S:")) != EOF) {
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44 switch (c) {
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45 case 'a':
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46 a = atof(optarg);
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47 if (a <= 0.0) {
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48 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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49 exit(1);
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50 }
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51 break;
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52 case 'b':
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53 b = atof(optarg);
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54 if (b <= 0.0) {
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55 fprintf(stderr, "%s: beta factor %f out of range\n", progname, b);
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56 exit(1);
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57 }
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58 break;
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59 case 'd':
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60 d = atof(optarg);
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61 if (d <= 0.0) {
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62 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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63 exit(1);
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64 }
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65 break;
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66 case 'e':
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67 e = atoi(optarg);
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68 if (e < 0) {
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69 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
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70 }
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71 break;
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72 case 'f':
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73 f = atoi(optarg);
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74 if (f <= 0) {
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75 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
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76 exit(1);
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77 }
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78 break;
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79 case 'F':
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80 strcpy(F, optarg);
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81 break;
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82 case 'h':
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83 case '?':
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84 usage();
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85 break;
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86 case 'm':
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87 m = atof(optarg);
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88 break;
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89 case 'n':
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90 n = atoi(optarg);
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91 if (n < 1 || n > 32000) {
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92 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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93 exit(1);
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94 }
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95 break;
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96 case 'o':
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97 if ((out = fopen(optarg, "w")) == NULL) {
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98 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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99 exit(1);
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100 }
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101 strcpy(output_name, optarg);
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102 break;
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103 case 's':
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104 if ((sig = fopen(optarg, "r")) == NULL) {
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105 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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106 exit(1);
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107 }
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108 strcpy(signature_name, optarg);
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109 break;
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110 case 'S':
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111 s = atoi(optarg);
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112 break;
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113 }
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114 }
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115
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116 argc -= optind;
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117 argv += optind;
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118
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119 if (argc > 0) {
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120 usage();
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121 exit(1);
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122 }
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123
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124 if (sig) {
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125 char line[32];
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126 fgets(line, sizeof(line), sig);
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127 if (strspn(line, "WGSG") >= 4) {
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128 if (n == 0)
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129 fscanf(sig, "%d\n", &n);
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130 else
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131 fscanf(sig, "%*d\n");
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132 if (a == 0.0)
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133 fscanf(sig, "%lf\n", &a);
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134 else
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135 fscanf(sig, "%*lf\n");
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136 if (b == 0.0)
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137 fscanf(sig, "%lf\n", &b);
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138 else
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139 fscanf(sig, "%*lf\n");
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140 if (e < 0)
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141 fscanf(sig, "%d\n", &e);
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142 else
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143 fscanf(sig, "%*d\n");
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144 if (f == 0)
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145 fscanf(sig, "%d\n", &f);
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146 else
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147 fscanf(sig, "%*d\n");
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148 if (!strcmp(F, ""))
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149 fscanf(sig, "%[^\n\r]\n", &F);
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150 else
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151 fscanf(sig, "%*[^\n\r]\n");
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152 }
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153 else {
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154 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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155 exit(1);
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156 }
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157 }
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158
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159 if (s)
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160 srandom(s);
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161 else
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162 srandom(time(NULL) * getpid());
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163
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164 fprintf(out, "WGSG\n");
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165 fprintf(out, "%d\n", n);
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166 fprintf(out, "%f\n", a);
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167 fprintf(out, "%f\n", b);
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168 fprintf(out, "%d\n", e);
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169 fprintf(out, "%d\n", f);
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170 fprintf(out, "%s\n", F);
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171
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172 n >>= 1;
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173 while (n > 0) {
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174 double x;
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175 double x1, x2;
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176
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177 /*
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178 * Algorithm P (Polar method for normal deviates),
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179 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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180 */
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181 do {
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182 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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183 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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184 x = x1 * x1 + x2 * x2;
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185 } while (x >= 1.0);
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186 x1 *= sqrt((-2.0) * log(x) / x);
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187 x2 *= sqrt((-2.0) * log(x) / x);
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188
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189 fprintf(out, "%f\n", m + d * x1);
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190 fprintf(out, "%f\n", m + d * x2);
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191
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192 n--;
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193 }
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194
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195 fclose(out);
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196
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197 exit(0);
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198 }
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