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1 #include "wm.h"
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2 #include "signature.h"
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3
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4 char *progname;
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5
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6 void usage(void) {
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7 fprintf(stderr, "usage: %s [-h] [-C] [-o file] [-v n] -s file file\n\n", progname);
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8 fprintf(stderr, "\t-C\t\toutput correlation only\n");
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9 fprintf(stderr, "\t-h\t\tprint usage\n");
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10 fprintf(stderr, "\t-o file\t\toutput file\n");
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11 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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12 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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13 exit(0);
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14 }
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15
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16 int main(int argc, char *argv[]) {
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17
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18 FILE *in = stdin;
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19 FILE *out = stdout;
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20 FILE *sig = NULL;
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21
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22 char signature_name[MAXPATHLEN];
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23 char output_name[MAXPATHLEN] = "(stdout)";
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24 char input_name[MAXPATHLEN] = "(stdin)";
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25
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26 int c, i;
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27 int pattern1, pattern2;
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28 double quality;
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29 double threshold1, threshold2;
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30 int blocksize;
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31 int corr = 0, match = 0;
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32 int verbose = 0;
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33 int skipping = 0;
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34
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35 int correlation_only = 0;
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36
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37 int seed;
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38 char line[32];
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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 fgets(line, sizeof(line), sig);
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93 if (strspn(line, "BRSG") >= 4) {
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94 fscanf(sig, "%d\n", &nbit_signature1);
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95 fscanf(sig, "%d\n", &skipping);
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96 fscanf(sig, "%d\n", &pattern1);
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97 fscanf(sig, "%d\n", &pattern2);
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98 fscanf(sig, "%lf\n", &quality);
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99 fscanf(sig, "%lf\n", &threshold1);
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100 fscanf(sig, "%lf\n", &threshold2);
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101 fscanf(sig, "%d\n", &blocksize);
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102 fscanf(sig, "%d\n", &seed);
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103 srandom(seed);
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104 n_signature1 = NBITSTOBYTES(nbit_signature1);
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105 fread(signature1, sizeof(char), n_signature1, sig);
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106 fscanf(sig, "\n");
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107 }
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108 else {
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109 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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110 exit(1);
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111 }
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112 close(sig);
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113 }
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114 else {
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115 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
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116 exit(1);
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117 }
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118
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119 fgets(line, sizeof(line), in);
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120 if (strspn(line, "BRWM") >= 4) {
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121 fscanf(in, "%d\n", &nbit_signature2);
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122 n_signature2 = NBITSTOBYTES(nbit_signature2);
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123 fread(signature2, sizeof(char), n_signature2, in);
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124 fscanf(in, "\n");
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125 }
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126 else {
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127 fprintf(stderr, "%s: invalid watermark file %s\n", progname, input_name);
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128 exit(1);
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129 }
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130
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131 if (verbose > 0) {
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132 fprintf(stderr, "signature length: %d\n", nbit_signature1);
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133 fprintf(stderr, "watermark length: %d\n", nbit_signature2);
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134 }
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135
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136 for (i = 0; i < nbit_signature2; i++)
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137 if (get_signature1_bit(i % nbit_signature1) == get_signature2_bit(i))
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138 corr++, match++;
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139 else
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140 corr--;
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141
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142 if (correlation_only)
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143 fprintf(out, "%lf\n", (double) corr / nbit_signature2);
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144 else {
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145 fprintf(out, "bit matches: %d/%d\n", match, nbit_signature2);
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146 fprintf(out, "correlation: %lf\n", (double) corr / nbit_signature2);
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147 }
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148
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149 exit(0);
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150 }
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