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comparison Meerwald-dir/cmp_kund2_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_kund2_sig.c@71dd4b96221b
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 char *binstr;
27
28 int correlation_only = 0;
29
30 int c, i;
31 int quality = 0;
32 int blocksize = 0;
33 int corr = 0, match = 0;
34 int verbose = 0;
35 int filter = 0;
36 int method = 0;
37 int level = 0;
38 char filter_name[MAXPATHLEN] = "";
39 int k;
40
41 int seed;
42 char line[32];
43
44 progname = argv[0];
45
46 while ((c = getopt(argc, argv, "h?Co:s:v:")) != EOF) {
47 switch (c) {
48 case 'h':
49 case '?':
50 usage();
51 break;
52 case 'C':
53 correlation_only = 1;
54 break;
55 case 'o':
56 if ((out = fopen(optarg, "w")) == NULL) {
57 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
58 exit(1);
59 }
60 strcpy(output_name, optarg);
61 break;
62 case 's':
63 if ((sig = fopen(optarg, "r")) == NULL) {
64 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
65 exit(1);
66 }
67 strcpy(signature_name, optarg);
68 break;
69 case 'v':
70 verbose = atoi(optarg);
71 if (verbose < 0) {
72 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
73 exit(1);
74 }
75 break;
76 }
77 }
78
79 argc -= optind;
80 argv += optind;
81
82 if (argc > 1) {
83 usage();
84 exit(1);
85 }
86
87 if (argc == 1 && *argv[0] != '-') {
88 if ((in = fopen(argv[0], "r")) == NULL) {
89 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
90 exit(1);
91 }
92 else
93 strcpy(input_name, argv[0]);
94 }
95
96 if (sig) {
97 fgets(line, sizeof(line), sig);
98 if (strspn(line, "KD2SG") >= 5) {
99 fscanf(sig, "%d\n", &nbit_signature1);
100 fscanf(sig, "%d\n", &quality);
101 fscanf(sig, "%d\n", &blocksize);
102 fscanf(sig, "%d\n", &method);
103 fscanf(sig, "%d\n", &filter);
104 fscanf(sig, "%[^\n\r]\n", filter_name);
105 fscanf(sig, "%d\n", &level);
106 fscanf(sig, "%d\n", &seed);
107 srandom(seed);
108 n_signature1 = NBITSTOBYTES(nbit_signature1);
109
110 binstr = malloc((nbit_signature1 + 1) * sizeof(char));
111 fscanf(sig, "%[01]\n", binstr);
112 binstr_to_sig1(binstr);
113 free(binstr);
114 }
115 else {
116 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
117 exit(1);
118 }
119 fclose(sig);
120 }
121 else {
122 fprintf(stderr, "%s: original signature file not specified, use -s file option\n", progname);
123 exit(1);
124 }
125
126 fgets(line, sizeof(line), in);
127 if (strspn(line, "KD2WM") >= 5) {
128 int max_nbit_signature;
129 int min_nbit_signature = -1;
130 double pe[100];
131 double pe_sum;
132 double alpha[100];
133 char *w[100];
134
135 fscanf(in, "%d\n", &max_nbit_signature);
136
137 k = 0;
138 while (!feof(in) && k < 100) {
139 int e;
140
141 fscanf(in, "%d\n", &nbit_signature2);
142 w[k] = binstr = malloc(sizeof(char) * (nbit_signature2 + 1));
143 fscanf(in, "%[01]\n", binstr);
144
145 binstr_to_sig2(binstr);
146
147 if (nbit_signature2 < min_nbit_signature || min_nbit_signature == -1)
148 min_nbit_signature = nbit_signature2;
149 e = 0;
150 for (i = 0; i < nbit_signature2; i += 2) {
151 if (get_signature1_bit(i % nbit_signature1) != get_signature2_bit(i))
152 e++;
153 }
154 if (e > 0)
155 pe[k++] = log( (1 - (e / (double) nbit_signature2)) / (e / (double) nbit_signature2));
156 else
157 pe[k++] = 0;
158 }
159
160 pe_sum = 0.0;
161 for (i = 0; i < k; i++) {
162 // fprintf(stderr, "XXX pe[%d] = %f\n", i, pe[i]);
163 pe_sum += pe[i];
164 }
165
166 for (i = 0; i < k; i++) {
167 if (pe_sum != 0)
168 alpha[i] = pe[i] / pe_sum;
169 else
170 alpha[i] = 1.0;
171 }
172
173 nbit_signature = min_nbit_signature;
174 for (i = 0; i < min_nbit_signature; i++) {
175 double s = 0.0;
176 int j;
177
178 for (j = 0; j < k; j++) {
179 int bit;
180 //fprintf(stderr, "XXX %d %d\n", i, j);
181 binstr_to_sig2(w[j]);
182 bit = get_signature2_bit(i) ? 1 : -1;
183 s += alpha[j] * bit;
184 }
185 // fprintf(stderr, "YYY %d %f\n", i, s);
186 set_signature_bit(i, s > 0 ? 1 : 0);
187 }
188 }
189 else {
190 fprintf(stderr, "%s: invalid watermark file %s\n", progname, input_name);
191 exit(1);
192 }
193
194 if (verbose > 0) {
195 fprintf(stderr, "signature length: %d\n", nbit_signature1);
196 fprintf(stderr, "watermark length: %d\n", nbit_signature);
197 }
198
199 for (i = 0; i < nbit_signature; i++)
200 if (get_signature1_bit(i % nbit_signature1) == get_signature2_bit(i))
201 corr++, match++;
202 else
203 corr--;
204
205 if (correlation_only)
206 fprintf(out, "%lf\n", (double) corr / nbit_signature2);
207 else {
208 fprintf(stderr, "redundant blocks: %d\n", k);
209 fprintf(out, "bit matches: %d/%d\n", match, nbit_signature2);
210 fprintf(out, "correlation: %lf\n", (double) corr / nbit_signature2);
211 }
212
213 exit(0);
214 }

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