Mercurial > hg > wm
diff Meerwald-dir/gen_koch_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/gen_koch_sig.c@4987db85cfae |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Meerwald-dir/gen_koch_sig.c Fri Dec 20 13:08:59 2024 +0100 @@ -0,0 +1,158 @@ +#include "wm.h" +#include "signature.h" + +char *progname; + +void usage(void) { + fprintf(stderr, "usage: %s [-l n] [-n n] [-o file] [-q n] [-s file] [-S n] file\n\n", progname); + fprintf(stderr, "\t-h\t\tprint usage\n"); + fprintf(stderr, "\t-l n\t\tsignature strength factor (default 5.0)\n"); + fprintf(stderr, "\t-n n\t\twatermark bit length\n"); + fprintf(stderr, "\t-o file\t\toutput file\n"); + fprintf(stderr, "\t-q n\t\tquantization (JPEG quality) factor (default 90)\n"); + fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n"); + fprintf(stderr, "\t-S n\t\tseed\n"); + exit(0); +} + +int main(int argc, char *argv[]) { + FILE *in = stdin; + FILE *out = stdout; + FILE *sig = NULL; + + char output_name[MAXPATHLEN] = "(stdout)"; + char input_name[MAXPATHLEN] = "(stdin)"; + char signature_name[MAXPATHLEN]; + + int c; + int i; + int n = 0; + int nb; + int s = 0; + int q = 90; + double l = 5.0; + + progname = argv[0]; wm_init(); + + while ((c = getopt(argc, argv, "h?l:n:o:q:s:S:")) != EOF) { + switch (c) { + case 'h': + case '?': + usage(); + break; + case 'l': + l = atof(optarg); + if (l <= 0.0) { + fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, l); + exit(1); + } + break; + case 'n': + n = atoi(optarg); + if (n < 1 || n > 1000) { + fprintf(stderr, "%s: watermark length %d out of range\n", progname, n); + exit(1); + } + break; + case 'o': + if ((out = fopen(optarg, "wb")) == NULL) { + fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); + exit(1); + } + strcpy(output_name, optarg); + break; + case 'q': + q = atoi(optarg); + if (q <= 0 || q > 100) { + fprintf(stderr, "%s: quantization factor %d out of range\n", progname, q); + exit(1); + } + break; + case 's': + if ((sig = fopen(optarg, "r")) == NULL) { + fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); + exit(1); + } + strcpy(signature_name, optarg); + break; + case 'S': + s = atoi(optarg); + break; + } + } + + argc -= optind; + argv += optind; + + if (argc > 1) { + usage(); + exit(1); + } + + if (argc == 1 && *argv[0] != '-') { + if ((in = fopen(argv[0], "rb")) == NULL) { + fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); + exit(1); + } + else + strcpy(input_name, argv[0]); + } + + if (s) + srandom(s); + else + srandom(time(NULL) * getpid()); + + if (sig) { + char line[128]; + fgets(line, sizeof(line), sig); + if (strspn(line, "KCSG") >= 4) { + if (n == 0) + fscanf(sig, "%d\n", &n); + else + fscanf(sig, "%*d\n"); + if (l == 0.0) + fscanf(sig, "%lf\n", &l); + else + fscanf(sig, "%*f\n"); + if (q == 0) + fscanf(sig, "%d\n", &q); + else + fscanf(sig, "%*d\n"); + } + else { + fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); + exit(1); + } + fclose(sig); + } + + if (n > 0) { + nb = fread(signature, sizeof(char), i = NBITSTOBYTES(n), in); + if (nb < i) { + fprintf(stderr, "%s: failed to read all %d signature bits from %s\n", progname, n, input_name); + exit(1); + } + } + else { + if (fscanf(in, "%128[^\n\r]", signature) == EOF) { + fprintf(stderr, "%s: failed to read signature bits from %s\n", progname, input_name); + exit(1); + } + nb = strlen(signature); + n = NBYTESTOBITS(nb); + fprintf(stderr, "%s: got %d signature bits\n", progname, n); + } + + fprintf(out, "KCSG\n"); + fprintf(out, "%d\n", n); + fprintf(out, "%f\n", l); + fprintf(out, "%d\n", q); + fprintf(out, "%ld\n", random()); + fwrite(signature, sizeof(char), nb, out); + fprintf(out, "\n"); + + fclose(out); + + exit(0); +}