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comparison Meerwald-dir/cmp_frid2_sig.c @ 24:9f20bce6184e v0.7

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move directories, support netpbm 11
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/cmp_frid2_sig.c@4987db85cfae
children
comparison
equal deleted inserted replaced
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 corr1 = 0, match1 = 0;
30 int corr2 = 0, match2 = 0;
31 int verbose = 0;
32
33 char line[1024];
34
35 progname = argv[0];
36
37 while ((c = getopt(argc, argv, "h?Co:s:v:")) != EOF) {
38 switch (c) {
39 case 'h':
40 case '?':
41 usage();
42 break;
43 case 'C':
44 correlation_only = 1;
45 break;
46 case 'o':
47 if ((out = fopen(optarg, "w")) == NULL) {
48 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
49 exit(1);
50 }
51 strcpy(output_name, optarg);
52 break;
53 case 's':
54 if ((sig = fopen(optarg, "r")) == NULL) {
55 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
56 exit(1);
57 }
58 strcpy(signature_name, optarg);
59 break;
60 case 'v':
61 verbose = atoi(optarg);
62 if (verbose < 0) {
63 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
64 exit(1);
65 }
66 break;
67 }
68 }
69
70 argc -= optind;
71 argv += optind;
72
73 if (argc > 1) {
74 usage();
75 exit(1);
76 }
77
78 if (argc == 1 && *argv[0] != '-') {
79 if ((in = fopen(argv[0], "r")) == NULL) {
80 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
81 exit(1);
82 }
83 else
84 strcpy(input_name, argv[0]);
85 }
86
87 if (sig) {
88 fgets(line, sizeof(line), sig);
89 if (strspn(line, "FR2SG") >= 5) {
90 fscanf(sig, "%d\n", &nbit_signature);
91 fscanf(sig, "%*f\n");
92 fscanf(sig, "%*f\n");
93 fscanf(sig, "%*d\n");
94 n_signature = NBITSTOBYTES(nbit_signature);
95 fread(signature, sizeof(char), n_signature, sig);
96 fscanf(sig, "\n");
97 }
98 else {
99 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
100 exit(1);
101 }
102 fclose(sig);
103 }
104 else {
105 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
106 exit(1);
107 }
108
109 fgets(line, sizeof(line), in);
110 if (strspn(line, "FR2WM") >= 5) {
111 fscanf(in, "%d\n", &nbit_signature1);
112 n_signature1 = NBITSTOBYTES(nbit_signature1);
113 fread(signature1, sizeof(char), n_signature1, in);
114 // fscanf(in, "\n");
115 fscanf(in, "%d\n", &nbit_signature2);
116 n_signature2 = NBITSTOBYTES(nbit_signature2);
117 fread(signature2, sizeof(char), n_signature2, in);
118 fscanf(in, "\n");
119 }
120 else {
121 fprintf(stderr, "%s: invalid watermark file %s\n", progname, input_name);
122 exit(1);
123 }
124
125 if (verbose > 0) {
126 fprintf(stderr, "signature length: %d\n", nbit_signature);
127 fprintf(stderr, "watermark length (low. freq.): %d\n", nbit_signature1);
128 fprintf(stderr, "watermark length (med. freq.): %d\n", nbit_signature2);
129 }
130
131 for (i = 0; i < nbit_signature; i++) {
132 if (get_signature_bit(i) == get_signature1_bit(i))
133 corr1++, match1++;
134 else
135 corr1--;
136 if (get_signature_bit(i) == get_signature2_bit(i))
137 corr2++, match2++;
138 else
139 corr2--;
140 }
141
142 if (correlation_only)
143 fprintf(out, "%lf\n", (double) (corr1 + corr2) / (nbit_signature1 + nbit_signature2));
144 else {
145 fprintf(out, "bit matches (low freq.): %d/%d\n", match1, nbit_signature1);
146 fprintf(out, "correlation (low. freq.): %lf\n", (double) corr1 / nbit_signature1);
147 fprintf(out, "bit matches (med. freq.): %d/%d\n", match2, nbit_signature2);
148 fprintf(out, "correlation (med. freq.): %lf\n", (double) corr2 / nbit_signature2);
149 fprintf(out, "total correlation: %lf\n", (double) (corr1 + corr2) / (nbit_signature1 + nbit_signature2));
150 }
151
152 exit(0);
153 }

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