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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-v n\t\tverbosity level\n");
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11 fprintf(stderr, "\t-s file\t\toriginal signature file\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 s1, s2, s3;
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28 char line[32];
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29 int matches;
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30
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31 int verbose = 0;
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32 int correlation_only = 0;
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33
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34 progname = argv[0];
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35
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36 while ((c = getopt(argc, argv, "h?o:s:v:C")) != EOF) {
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37 switch (c) {
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38 case 'h':
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39 case '?':
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40 usage();
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41 break;
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42 case 'o':
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43 if ((out = fopen(optarg, "w")) == NULL) {
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44 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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45 exit(1);
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46 }
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47 strcpy(output_name, optarg);
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48 break;
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49 case 's':
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50 if ((sig = fopen(optarg, "r")) == NULL) {
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51 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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52 exit(1);
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53 }
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54 strcpy(signature_name, optarg);
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55 break;
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56 case 'v':
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57 verbose = atoi(optarg);
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58 if (verbose < 0) {
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59 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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60 exit(1);
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61 }
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62 break;
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63 case 'C':
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64 correlation_only = 1;
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65 break;
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66 }
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67 }
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68
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69 argc -= optind;
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70 argv += optind;
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71
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72 if (argc > 1) {
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73 usage();
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74 exit(1);
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75 }
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76
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77 if (argc == 1 && *argv[0] != '-')
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78 if ((in = fopen(argv[0], "r")) == NULL) {
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79 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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80 exit(1);
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81 }
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82 else
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83 strcpy(input_name, argv[0]);
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84
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85 if (!sig) {
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86 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
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87 exit(1);
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88 }
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89
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90 fgets(line, sizeof(line), sig);
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91 if (strspn(line, "CVSG") < 4) {
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92 fprintf(stderr, "%s: original signature file %s invalid\n", progname, signature_name);
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93 exit(1);
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94 }
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95
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96 fgets(line, sizeof(line), in);
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97 if (strspn(line, "CVWM") < 4) {
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98 fprintf(stderr, "%s: signature file %s invalid\n", progname, input_name);
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99 exit(1);
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100 }
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101
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102 fscanf(sig, "%d\n", &sig_n);
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103 fscanf(in, "%d\n", &in_n);
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104 if (sig_n != in_n) {
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105 fprintf(stderr, "%s: watermark length mismatch (original %d, input %d)\n", progname, sig_n, in_n);
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106 exit(1);
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107 }
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108 if (sig_n <= 0 || sig_n > 1000) {
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109 fprintf(stderr, "%s: invalid original watermark length %d\n", progname, sig_n);
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110 exit(1);
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111 }
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112 if (in_n <= 0 || in_n > 1000) {
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113 fprintf(stderr, "%s: invalid watermark length %d\n", progname, in_n);
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114 exit(1);
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115 }
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116
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117 fscanf(sig, "%*lf\n");
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118 fscanf(sig, "%*d\n");
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119 fscanf(sig, "%*d\n");
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120 fscanf(sig, "%*[^\n\r]\n");
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121
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122 /*
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123 * normalized correlation
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124 * Craver, S., "Can Invisible Watermarks Resolve Rightful Ownership?", IBM Research Report, 1996, p. 5
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125 */
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126
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127 s1 = s2 = s3 = 0.0;
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128 matches = 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 matches += SIGN(sig_x * in_x);
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136
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137 if (verbose >= 1) {
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138 fprintf(stderr, "orig %f input %f\n", sig_x, in_x);
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139 }
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140
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141 s1 += sig_x * in_x;
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142 s2 += in_x * in_x;
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143 s3 += sig_x * sig_x;
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144
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145 in_n--;
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146 }
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147
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148 if (!correlation_only) {
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149 fprintf(out, "%s: correlation %f, hamming distance %f\n", progname, s1 / sqrt(s2 * s3), (double) matches / sig_n);
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150 }
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151 else
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152 fprintf(out, "%f\n", (double) matches / sig_n);
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153
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154 fclose(sig);
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155 fclose(out);
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156 fclose(in);
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157
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158 exit(0);
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159 }
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