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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 [-h] [-C] [-o file] [-v n] -s file file\n\n", progname);
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7 fprintf(stderr, "\t-C\t\toutput correlation only\n");
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8 fprintf(stderr, "\t-h\t\tprint usage\n");
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9 fprintf(stderr, "\t-o file\t\toutput file\n");
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10 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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11 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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12 exit(0);
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13 }
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14
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15 int main(int argc, char *argv[]) {
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16
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17 FILE *in = stdin;
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18 FILE *out = stdout;
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19 FILE *sig = NULL;
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20
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21 char signature_name[MAXPATHLEN];
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22 char output_name[MAXPATHLEN] = "(stdout)";
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23 char input_name[MAXPATHLEN] = "(stdin)";
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24
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25 int c;
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26 int sig_n, in_n;
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27 double sig_a, in_a;
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28 double sig_mean, sig_variance;
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29 double s1, s2, s3;
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30 char line[32];
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31
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32 int verbose = 0;
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33 int correlation_only = 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, "h?Co:s:v:")) != EOF) {
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38 switch (c) {
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39 case 'h':
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40 case '?':
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41 usage();
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42 break;
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43 case 'C':
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44 correlation_only = 1;
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45 break;
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46 case 'o':
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47 if ((out = fopen(optarg, "w")) == NULL) {
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48 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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49 exit(1);
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50 }
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51 strcpy(output_name, optarg);
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52 break;
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53 case 's':
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54 if ((sig = fopen(optarg, "r")) == NULL) {
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55 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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56 exit(1);
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57 }
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58 strcpy(signature_name, optarg);
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59 break;
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60 case 'v':
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61 verbose = atoi(optarg);
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62 if (verbose < 0) {
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63 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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64 exit(1);
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65 }
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66 break;
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67 }
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68 }
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69
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70 argc -= optind;
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71 argv += optind;
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72
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73 if (argc > 1) {
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74 usage();
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75 exit(1);
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76 }
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77
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78 if (argc == 1 && *argv[0] != '-')
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79 if ((in = fopen(argv[0], "r")) == NULL) {
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80 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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81 exit(1);
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82 }
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83 else
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84 strcpy(input_name, argv[0]);
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85
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86 if (!sig) {
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87 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
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88 exit(1);
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89 }
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90
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91 fgets(line, sizeof(line), sig);
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92 if (strspn(line, "CXSG") < 4) {
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93 fprintf(stderr, "%s: original signature file %s invalid\n", progname, signature_name);
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94 exit(1);
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95 }
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96
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97 fgets(line, sizeof(line), in);
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98 if (strspn(line, "CXWM") < 4) {
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99 fprintf(stderr, "%s: watermark file %s invalid\n", progname, input_name);
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100 exit(1);
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101 }
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102
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103 fscanf(sig, "%d\n", &sig_n);
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104 fscanf(in, "%d\n", &in_n);
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105 if (sig_n != in_n) {
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106 fprintf(stderr, "%s: watermark length mismatch (original %d, input %d)\n", progname, sig_n, in_n);
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107 exit(1);
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108 }
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109 if (sig_n <= 0 || sig_n > 32000) {
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110 fprintf(stderr, "%s: invalid original watermark length %d\n", progname, sig_n);
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111 exit(1);
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112 }
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113 if (in_n <= 0 || in_n > 32000) {
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114 fprintf(stderr, "%s: invalid watermark length %d\n", progname, in_n);
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115 exit(1);
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116 }
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117
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118 fscanf(sig, "%lf\n", &sig_a);
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119
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120 fscanf(sig, "%lf\n", &sig_mean);
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121 fscanf(sig, "%lf\n", &sig_variance);
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122
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123 /*
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124 * normalized correlation
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125 * Craver, S., "Can Invisible Watermarks Resolve Rightful Ownership?", IBM Research Report, 1996, p. 5
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126 */
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127
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128 s1 = s2 = s3 = 0.0;
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129 while (in_n > 0) {
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130 double sig_x, in_x;
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131
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132 fscanf(sig, "%lf\n", &sig_x);
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133 fscanf(in, "%lf\n", &in_x);
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134
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135 if (verbose >= 1) {
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136 fprintf(stderr, "orig %f input %f\n", sig_x, in_x);
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137 }
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138
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139 s1 += sig_x * in_x;
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140 s2 += in_x * in_x;
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141 s3 += sig_x * sig_x;
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142
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143 in_n--;
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144 }
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145
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146 fprintf(out, "%f\n", s1 / sqrt(s2 * s3));
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147
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148 fclose(sig);
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149 fclose(out);
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150 fclose(in);
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151
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152 exit(0);
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153 }
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