--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/gen_kund_sig.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,164 @@
+#include "wm.h"
+#include "signature.h"
+
+char *progname;
+
+void usage(void) {
+  fprintf(stderr, "usage: %s [-e n] [-f n] [-F file] [-l n] [-n n] [-o file] [-q n] [-s n] file\n\n", progname);
+  fprintf(stderr, "\t-h\t\tprint usage\n");
+  fprintf(stderr, "\t-e n\t\twavelet filtering method (default 2)\n");
+  fprintf(stderr, "\t-f n\t\tfilter number (default 1)\n");
+  fprintf(stderr, "\t-F file\t\tfilter definition file (default 'filter.dat')\n");
+  fprintf(stderr, "\t-l n\t\tembedding level (default 1)\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\tsignature strength (default 1.0)\n");
+  fprintf(stderr, "\t-s n\t\tseed\n");
+  exit(0);
+}
+
+int main(int argc, char *argv[]) {
+  FILE *in = stdin;
+  FILE *out = stdout;
+
+  char output_name[MAXPATHLEN] = "(stdout)";
+  char input_name[MAXPATHLEN] = "(stdin)";
+
+  int c;
+  int i;
+  int l = 1;
+  int n = 0, nb;
+  int s = 0;
+  double q = 1.0;
+  int e = 2;
+  int f = 1;
+  char F[MAXPATHLEN] = "filter.dat";
+
+  progname = argv[0];
+
+#ifdef __EMX__
+  _fsetmode(in, "b");
+  _fsetmode(out, "b");
+#endif
+
+  while ((c = getopt(argc, argv, "e:f:F:h?l:n:o:q:s:")) != EOF) {
+    switch (c) {
+      case 'e':
+        e = atoi(optarg);
+        if (e < 0) {
+          fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, e);
+        }
+        break;
+      case 'f':
+        f = atoi(optarg);
+        if (f <= 0) {
+          fprintf(stderr, "%s: filter number %d out of range\n", progname, f);
+          exit(1);
+        }
+        break;
+      case 'F':
+        strcpy(F, optarg);
+        break;
+      case 'h':
+      case '?':
+        usage();
+        break;
+      case 'l':
+        l = atoi(optarg);
+        if (l < 1) {
+          fprintf(stderr, "%s: embedding level out of range\n", progname);
+          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);
+        }
+        if (n % 4 != 0 || (int) sqrt(n / 4) * (int) sqrt(n / 4) != n) {
+          fprintf(stderr, "%s: watermark length not divisible by 4 or not a square number\n", progname);
+          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 = atof(optarg);
+        if (q <= 0.0) {
+          fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, q);
+          exit(1);
+        }
+        break;
+      case 's':
+        s = atoi(optarg);
+        break;
+    }
+  }
+
+  argc -= optind;
+  argv += optind;
+
+  if (argc > 0) {
+    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 (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 {
+    int n_square;
+    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);
+    n_square = (int) sqrt(n) * (int) sqrt(n);
+    fprintf(stderr, "%s: got %d signature bits, truncated to %d\n", progname, n, n_square);
+    n = n_square;
+    nb = NBITSTOBYTES(n);
+    if (n < 1) {
+      fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
+      exit(1);
+    }
+  }
+
+  fprintf(out, "KDSG\n");
+  fprintf(out, "%d\n", n);
+  fprintf(out, "%d\n", e);
+  fprintf(out, "%d\n", f);
+  fprintf(out, "%s\n", F);
+  fprintf(out, "%d\n", l);
+  fprintf(out, "%f\n", q);
+  fprintf(out, "%d\n", random());
+  fwrite(signature, sizeof(char), nb, out);
+  fprintf(out, "\n");
+
+  fclose(out);
+
+  exit(0);
+}