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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] [-e n] [-f n] [-F file] [-l n] [-n n] [-o file] [-s file] [-S n] [-t n] [-T n]\n\n", progname);
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7 fprintf(stderr, "\t-a n\t\talpha factor (default 0.2)\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-l n\t\tdecomposition levels (default 3)\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\tsignature to embed in input image\n");
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18 fprintf(stderr, "\t-S n\t\tseed\n");
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19 fprintf(stderr, "\t-t n\t\tcasting threshold (default 40.0)\n");
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20 fprintf(stderr, "\t-T n\t\tdetection threshold (default 50.0)\n");
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21 exit(0);
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22 }
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23
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24 int main(int argc, char *argv[]) {
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25 FILE *out = stdout;
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26 FILE *sig = NULL;
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27
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28 char output_name[MAXPATHLEN] = "(stdout)";
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29 char signature_name[MAXPATHLEN];
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30
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31 int c;
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32 int i;
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33 int n = 1000;
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34 int s = 0;
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35 int e = 2;
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36 int f = 1;
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37 int l = 3;
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38 char F[MAXPATHLEN] = "filter.dat";
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39 double a = 0.2;
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40 double t1 = 40.0;
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41 double t2 = 50.0;
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42 double m = 0.0;
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43 double d = 1.0;
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44
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45 progname = argv[0];
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46
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47 while ((c = getopt(argc, argv, "a:b:d:e:f:F:h?l:m:n:o:s:S:t:T:")) != EOF) {
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48 switch (c) {
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49 case 'a':
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50 a = atof(optarg);
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51 if (a <= 0.0) {
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52 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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53 exit(1);
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54 }
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55 break;
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56 case 'd':
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57 d = atof(optarg);
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58 if (d <= 0.0) {
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59 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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60 exit(1);
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61 }
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62 break;
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63
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64 case 'e':
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65 e = atoi(optarg);
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66 if (e < 0) {
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67 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
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68 }
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69 break;
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70 case 'f':
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71 f = atoi(optarg);
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72 if (f <= 0) {
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73 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
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74 exit(1);
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75 }
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76 break;
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77 case 'F':
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78 strcpy(F, optarg);
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79 break;
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80 case 'h':
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81 case '?':
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82 usage();
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83 break;
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84 case 'l':
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85 l = atoi(optarg);
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86 if (l <= 0) {
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87 fprintf(stderr, "%s: decomposition level %d out of range\n", l);
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88 exit(1);
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89 }
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90 break;
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91 case 'm':
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92 m = atof(optarg);
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93 break;
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94 case 'n':
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95 n = atoi(optarg);
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96 if (n < 1 || n > 32000) {
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97 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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98 exit(1);
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99 }
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100 break;
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101 case 'o':
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102 if ((out = fopen(optarg, "w")) == NULL) {
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103 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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104 exit(1);
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105 }
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106 strcpy(output_name, optarg);
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107 break;
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108 case 's':
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109 if ((sig = fopen(optarg, "r")) == NULL) {
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110 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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111 exit(1);
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112 }
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113 strcpy(signature_name, optarg);
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114 break;
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115 case 'S':
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116 s = atoi(optarg);
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117 break;
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118 case 't':
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119 t1 = atof(optarg);
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120 if (t1 <= 0.0) {
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121 fprintf(stderr, "%s: casting threshold %f out of range\n", progname, t1);
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122 exit(1);
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123 }
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124 break;
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125 case 'T':
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126 t2 = atof(optarg);
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127 if (t2 <= 0.0) {
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128 fprintf(stderr, "%s: detection threshold %f out of range\n", progname, t2);
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129 exit(1);
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130 }
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131 break;
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132 }
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133 }
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134
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135 argc -= optind;
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136 argv += optind;
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137
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138 if (argc > 0) {
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139 usage();
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140 exit(1);
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141 }
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142
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143 if (sig) {
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144 char line[32];
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145 fgets(line, sizeof(line), sig);
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146 if (strspn(line, "DGSG") >= 4) {
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147 if (n == 0)
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148 fscanf(sig, "%d\n", &n);
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149 else
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150 fscanf(sig, "%*d\n");
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151 if (l == 0)
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152 fscanf(sig, "%d\n", &l);
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153 else
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154 fscanf(sig, "%*d\n");
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155 if (a == 0.0)
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156 fscanf(sig, "%lf\n", &a);
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157 else
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158 fscanf(sig, "%*lf\n");
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159 if (t1 == 0.0)
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160 fscanf(sig, "%lf\n", &t1);
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161 else
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162 fscanf(sig, "%*lf\n");
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163 if (t2 == 0.0)
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164 fscanf(sig, "%lf\n", &t2);
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165 else
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166 fscanf(sig, "%*lf\n");
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167 if (e < 0)
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168 fscanf(sig, "%d\n", &e);
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169 else
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170 fscanf(sig, "%*d\n");
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171 if (f == 0)
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172 fscanf(sig, "%d\n", &f);
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173 else
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174 fscanf(sig, "%*d\n");
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175 if (!strcmp(F, ""))
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176 fscanf(sig, "%[^\n\r]\n", &F);
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177 else
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178 fscanf(sig, "%*[^\n\r]\n");
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179 }
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180 else {
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181 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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182 exit(1);
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183 }
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184 }
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185
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186 if (s)
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187 srandom(s);
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188 else
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189 srandom(time(NULL) * getpid());
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190
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191 fprintf(out, "DGSG\n");
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192 fprintf(out, "%d\n", n);
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193 fprintf(out, "%d\n", l);
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194 fprintf(out, "%f\n", a);
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195 fprintf(out, "%f\n", t1);
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196 fprintf(out, "%f\n", t2);
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197 fprintf(out, "%d\n", e);
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198 fprintf(out, "%d\n", f);
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199 fprintf(out, "%s\n", F);
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200
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201 n >>= 1;
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202 while (n > 0) {
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203 double x;
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204 double x1, x2;
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205
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206 /*
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207 * Algorithm P (Polar method for normal deviates),
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208 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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209 */
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210 do {
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211 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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212 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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213 x = x1 * x1 + x2 * x2;
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214 } while (x >= 1.0);
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215 x1 *= sqrt((-2.0) * log(x) / x);
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216 x2 *= sqrt((-2.0) * log(x) / x);
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217
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218 fprintf(out, "%f\n", m + d * x1);
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219 fprintf(out, "%f\n", m + d * x2);
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220
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221 n--;
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222 }
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223
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224 fclose(out);
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225
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226 exit(0);
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227 }
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