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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, i, j, n;
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26 int in_level;
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27 double *input_watermark, *orig_watermark;
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28 int sig_n, in_n;
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29 double sig_a;
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30 double sig_A;
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31 int sig_l;
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32 int sig_e, sig_f;
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33 double s1, s2, s3;
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34 double correlation;
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35 char line[32];
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36
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37 int verbose = 0;
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38 int correlation_only = 0;
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39
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40 progname = argv[0];
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41
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42 while ((c = getopt(argc, argv, "h?Co:s:v:")) != EOF) {
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43 switch (c) {
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44 case 'h':
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45 case '?':
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46 usage();
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47 break;
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48 case 'C':
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49 correlation_only = 1;
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50 break;
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51 case 'o':
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52 if ((out = fopen(optarg, "w")) == NULL) {
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53 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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54 exit(1);
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55 }
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56 strcpy(output_name, optarg);
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57 break;
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58 case 's':
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59 if ((sig = fopen(optarg, "r")) == NULL) {
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60 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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61 exit(1);
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62 }
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63 strcpy(signature_name, optarg);
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64 break;
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65 case 'v':
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66 verbose = atoi(optarg);
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67 if (verbose < 0) {
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68 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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69 exit(1);
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70 }
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71 break;
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72 }
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73 }
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74
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75 argc -= optind;
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76 argv += optind;
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77
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78 if (argc > 1) {
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79 usage();
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80 exit(1);
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81 }
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82
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83 if (argc == 1 && *argv[0] != '-')
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84 if ((in = fopen(argv[0], "r")) == NULL) {
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85 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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86 exit(1);
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87 }
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88 else
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89 strcpy(input_name, argv[0]);
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90
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91 if (!sig) {
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92 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
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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), sig);
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97 if (strspn(line, "KISG") < 4) {
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98 fprintf(stderr, "%s: original signature file %s invalid\n", progname, signature_name);
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99 exit(1);
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100 }
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101
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102 fgets(line, sizeof(line), in);
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103 if (strspn(line, "KIWM") < 4) {
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104 fprintf(stderr, "%s: watermark file %s invalid\n", progname, input_name);
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105 exit(1);
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106 }
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107
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108 fscanf(sig, "%d\n", &sig_n);
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109 fscanf(in, "%d\n", &in_n);
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110
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111 if (sig_n <= 0 || sig_n > 32000) {
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112 fprintf(stderr, "%s: invalid original watermark length %d\n", progname, sig_n);
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113 exit(1);
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114 }
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115
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116 fscanf(sig, "%lf\n", &sig_a);
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117 fscanf(sig, "%lf\n", &sig_A);
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118 fscanf(sig, "%d\n", &sig_l);
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119 fscanf(sig, "%d\n", &sig_e);
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120 fscanf(sig, "%d\n", &sig_f);
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121 fscanf(sig, "%*[^\n\r]\n");
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122
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123 orig_watermark = malloc(sig_n * sizeof(double));
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124 for (i = 0; i < sig_n; i++)
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125 fscanf(sig, "%lf\n", &orig_watermark[i]);
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126 fclose(sig);
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127
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128 fscanf(in, "%d\n", &in_level);
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129 input_watermark = malloc(in_n * sizeof(double));
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130 for (i = 0; i < in_n; i++)
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131 fscanf(in, "%lf\n", &input_watermark[i]);
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132 fclose(in);
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133
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134 /*
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135 * normalized correlation
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136 * Craver, S., "Can Invisible Watermarks Resolve Rightful Ownership?", IBM Research Report, 1996, p. 5
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137 */
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138
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139 s1 = s2 = s3 = 0.0;
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140 for (i = 0; i < in_n; i++) {
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141 double in_x, sig_x;
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142
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143 in_x = input_watermark[i];
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144 sig_x = orig_watermark[i % sig_n];
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145
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146 s1 += sig_x * in_x;
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147 s2 += in_x * in_x;
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148 s3 += sig_x * sig_x;
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149 }
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150
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151 correlation = s1 / sqrt(s2 * s3);
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152
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153 if (!correlation_only)
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154 fprintf(out, "%s: correlation: %f\n", progname, correlation);
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155 else
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156 fprintf(out, "%f\n", correlation);
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157
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158 fclose(out);
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159
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160 free(orig_watermark);
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161 free(input_watermark);
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162
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163 exit(0);
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164 }
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