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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 n = 1000;
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33 int s = 0;
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34 int e = 2;
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35 int f = 1;
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36 int l = 3;
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37 char F[MAXPATHLEN] = "filter.dat";
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38 double a = 0.2;
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39 double t1 = 40.0;
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40 double t2 = 50.0;
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41 double m = 0.0;
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42 double d = 1.0;
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43
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44 progname = argv[0];
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45
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46 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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47 switch (c) {
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48 case 'a':
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49 a = atof(optarg);
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50 if (a <= 0.0) {
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51 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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52 exit(1);
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53 }
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54 break;
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55 case 'd':
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56 d = atof(optarg);
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57 if (d <= 0.0) {
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58 fprintf(stderr, "%s: deviation %f out of range\n", progname, d);
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59 exit(1);
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60 }
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61 break;
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62
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63 case 'e':
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64 e = atoi(optarg);
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65 if (e < 0) {
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66 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
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67 }
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68 break;
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69 case 'f':
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70 f = atoi(optarg);
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71 if (f <= 0) {
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72 fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
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73 exit(1);
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74 }
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75 break;
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76 case 'F':
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77 strcpy(F, optarg);
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78 break;
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79 case 'h':
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80 case '?':
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81 usage();
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82 break;
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83 case 'l':
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84 l = atoi(optarg);
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85 if (l <= 0) {
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8
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86 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, l);
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0
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87 exit(1);
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88 }
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89 break;
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90 case 'm':
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91 m = atof(optarg);
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92 break;
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93 case 'n':
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94 n = atoi(optarg);
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95 if (n < 1 || n > 32000) {
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96 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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97 exit(1);
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98 }
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99 break;
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100 case 'o':
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101 if ((out = fopen(optarg, "w")) == NULL) {
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102 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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103 exit(1);
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104 }
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105 strcpy(output_name, optarg);
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106 break;
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107 case 's':
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108 if ((sig = fopen(optarg, "r")) == NULL) {
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109 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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110 exit(1);
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111 }
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112 strcpy(signature_name, optarg);
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113 break;
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114 case 'S':
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115 s = atoi(optarg);
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116 break;
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117 case 't':
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118 t1 = atof(optarg);
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119 if (t1 <= 0.0) {
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120 fprintf(stderr, "%s: casting threshold %f out of range\n", progname, t1);
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121 exit(1);
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122 }
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123 break;
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124 case 'T':
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125 t2 = atof(optarg);
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126 if (t2 <= 0.0) {
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127 fprintf(stderr, "%s: detection threshold %f out of range\n", progname, t2);
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128 exit(1);
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129 }
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130 break;
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131 }
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132 }
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133
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134 argc -= optind;
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135 argv += optind;
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136
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137 if (argc > 0) {
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138 usage();
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139 exit(1);
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140 }
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141
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142 if (sig) {
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143 char line[32];
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144 fgets(line, sizeof(line), sig);
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145 if (strspn(line, "DGSG") >= 4) {
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146 if (n == 0)
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147 fscanf(sig, "%d\n", &n);
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148 else
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149 fscanf(sig, "%*d\n");
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150 if (l == 0)
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151 fscanf(sig, "%d\n", &l);
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152 else
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153 fscanf(sig, "%*d\n");
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154 if (a == 0.0)
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155 fscanf(sig, "%lf\n", &a);
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156 else
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157 fscanf(sig, "%*lf\n");
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158 if (t1 == 0.0)
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159 fscanf(sig, "%lf\n", &t1);
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160 else
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161 fscanf(sig, "%*lf\n");
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162 if (t2 == 0.0)
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163 fscanf(sig, "%lf\n", &t2);
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164 else
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165 fscanf(sig, "%*lf\n");
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166 if (e < 0)
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167 fscanf(sig, "%d\n", &e);
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168 else
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169 fscanf(sig, "%*d\n");
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170 if (f == 0)
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171 fscanf(sig, "%d\n", &f);
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172 else
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173 fscanf(sig, "%*d\n");
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174 if (!strcmp(F, ""))
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175 fscanf(sig, "%[^\n\r]\n", &F);
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176 else
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177 fscanf(sig, "%*[^\n\r]\n");
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178 }
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179 else {
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180 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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181 exit(1);
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182 }
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183 }
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184
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185 if (s)
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186 srandom(s);
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187 else
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188 srandom(time(NULL) * getpid());
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189
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190 fprintf(out, "DGSG\n");
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191 fprintf(out, "%d\n", n);
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192 fprintf(out, "%d\n", l);
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193 fprintf(out, "%f\n", a);
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194 fprintf(out, "%f\n", t1);
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195 fprintf(out, "%f\n", t2);
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196 fprintf(out, "%d\n", e);
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197 fprintf(out, "%d\n", f);
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198 fprintf(out, "%s\n", F);
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199
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200 n >>= 1;
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201 while (n > 0) {
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202 double x;
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203 double x1, x2;
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204
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205 /*
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206 * Algorithm P (Polar method for normal deviates),
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207 * Knuth, D., "The Art of Computer Programming", Vol. 2, 3rd Edition, p. 122
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208 */
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209 do {
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210 x1 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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211 x2 = 2.0 * ((random() & RAND_MAX) / ((double) RAND_MAX + 1.0)) - 1.0;
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212 x = x1 * x1 + x2 * x2;
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213 } while (x >= 1.0);
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214 x1 *= sqrt((-2.0) * log(x) / x);
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215 x2 *= sqrt((-2.0) * log(x) / x);
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216
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217 fprintf(out, "%f\n", m + d * x1);
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218 fprintf(out, "%f\n", m + d * x2);
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219
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220 n--;
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221 }
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222
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223 fclose(out);
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224
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225 exit(0);
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226 }
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