Mercurial > hg > wm
comparison Meerwald-dir/cmp_xie_sig.c @ 24:9f20bce6184e v0.7
move directories, support netpbm 11
| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/cmp_xie_sig.c@ad1d224896c5 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
|---|---|
| 1 #include "wm.h" | |
| 2 #include "signature.h" | |
| 3 | |
| 4 char *progname; | |
| 5 | |
| 6 void usage(void) { | |
| 7 fprintf(stderr, "usage: %s [-h] [-C] [-o file] [-v n] -s file file\n\n", progname); | |
| 8 fprintf(stderr, "\t-C\t\toutput correlation only\n"); | |
| 9 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 10 fprintf(stderr, "\t-o file\t\toutput file\n"); | |
| 11 fprintf(stderr, "\t-s file\t\toriginal signature file\n"); | |
| 12 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 13 exit(0); | |
| 14 } | |
| 15 | |
| 16 int main(int argc, char *argv[]) { | |
| 17 | |
| 18 FILE *in = stdin; | |
| 19 FILE *out = stdout; | |
| 20 FILE *sig = NULL; | |
| 21 | |
| 22 char signature_name[MAXPATHLEN]; | |
| 23 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 24 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 25 | |
| 26 int correlation_only = 0; | |
| 27 | |
| 28 int c, i; | |
| 29 int corr = 0, match = 0; | |
| 30 int verbose = 0; | |
| 31 int filter = 0; | |
| 32 int method = 0; | |
| 33 int level = 0; | |
| 34 double alpha = 0.0; | |
| 35 char filter_name[MAXPATHLEN] = ""; | |
| 36 | |
| 37 int seed; | |
| 38 char line[32]; | |
| 39 | |
| 40 progname = argv[0]; | |
| 41 | |
| 42 while ((c = getopt(argc, argv, "h?Co:s:v:")) != EOF) { | |
| 43 switch (c) { | |
| 44 case 'h': | |
| 45 case '?': | |
| 46 usage(); | |
| 47 break; | |
| 48 case 'C': | |
| 49 correlation_only = 1; | |
| 50 break; | |
| 51 case 'o': | |
| 52 if ((out = fopen(optarg, "w")) == NULL) { | |
| 53 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 54 exit(1); | |
| 55 } | |
| 56 strcpy(output_name, optarg); | |
| 57 break; | |
| 58 case 's': | |
| 59 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 60 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 61 exit(1); | |
| 62 } | |
| 63 strcpy(signature_name, optarg); | |
| 64 break; | |
| 65 case 'v': | |
| 66 verbose = atoi(optarg); | |
| 67 if (verbose < 0) { | |
| 68 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 69 exit(1); | |
| 70 } | |
| 71 break; | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 argc -= optind; | |
| 76 argv += optind; | |
| 77 | |
| 78 if (argc > 1) { | |
| 79 usage(); | |
| 80 exit(1); | |
| 81 } | |
| 82 | |
| 83 if (argc == 1 && *argv[0] != '-') { | |
| 84 if ((in = fopen(argv[0], "r")) == NULL) { | |
| 85 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 86 exit(1); | |
| 87 } | |
| 88 else | |
| 89 strcpy(input_name, argv[0]); | |
| 90 } | |
| 91 | |
| 92 if (sig) { | |
| 93 fgets(line, sizeof(line), sig); | |
| 94 if (strspn(line, "XESG") >= 4) { | |
| 95 fscanf(sig, "%d\n", &nbit_signature1); | |
| 96 fscanf(sig, "%lf\n", &alpha); | |
| 97 fscanf(sig, "%d\n", &method); | |
| 98 fscanf(sig, "%d\n", &filter); | |
| 99 fscanf(sig, "%[^\n\r]\n", filter_name); | |
| 100 fscanf(sig, "%d\n", &level); | |
| 101 fscanf(sig, "%d\n", &seed); | |
| 102 srandom(seed); | |
| 103 n_signature1 = NBITSTOBYTES(nbit_signature1); | |
| 104 fread(signature1, sizeof(char), n_signature1, sig); | |
| 105 fscanf(sig, "\n"); | |
| 106 } | |
| 107 else { | |
| 108 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 109 exit(1); | |
| 110 } | |
| 111 fclose(sig); | |
| 112 } | |
| 113 else { | |
| 114 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname); | |
| 115 exit(1); | |
| 116 } | |
| 117 | |
| 118 fgets(line, sizeof(line), in); | |
| 119 if (strspn(line, "XEWM") >= 4) { | |
| 120 fscanf(in, "%d\n", &nbit_signature2); | |
| 121 n_signature2 = NBITSTOBYTES(nbit_signature2); | |
| 122 fread(signature2, sizeof(char), n_signature2, in); | |
| 123 fscanf(in, "\n"); | |
| 124 } | |
| 125 else { | |
| 126 fprintf(stderr, "%s: invalid watermark file %s\n", progname, input_name); | |
| 127 exit(1); | |
| 128 } | |
| 129 | |
| 130 if (verbose > 0) { | |
| 131 fprintf(stderr, "signature length: %d\n", nbit_signature1); | |
| 132 fprintf(stderr, "watermark length: %d\n", nbit_signature2); | |
| 133 } | |
| 134 | |
| 135 for (i = 0; i < nbit_signature2; i++) | |
| 136 if (get_signature1_bit(i % nbit_signature1) == get_signature2_bit(i)) | |
| 137 corr++, match++; | |
| 138 else | |
| 139 corr--; | |
| 140 | |
| 141 if (correlation_only) | |
| 142 fprintf(out, "%lf\n", (double) corr / nbit_signature2); | |
| 143 else { | |
| 144 fprintf(out, "bit matches: %d/%d\n", match, nbit_signature2); | |
| 145 fprintf(out, "correlation: %lf\n", (double) corr / nbit_signature2); | |
| 146 } | |
| 147 | |
| 148 exit(0); | |
| 149 } |