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1 #include "wm.h"
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2 #include "signature.h"
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3
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4 char *progname;
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5
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6 void usage(void) {
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7 fprintf(stderr, "usage: %s [-a n] [-g n] [-o file] [-s n] file\n\n", progname);
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8 fprintf(stderr, "\t-a n\t\talpha factor (default 0.25)\n");
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9 fprintf(stderr, "\t-g n\t\tgamma factor (default 1.0)\n");
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10 fprintf(stderr, "\t-s n\t\tseed (default 0)\n");
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11 fprintf(stderr, "\t-h\t\tprint usage\n");
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12 fprintf(stderr, "\t-n n\t\twatermark length (default 100)\n");
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13 fprintf(stderr, "\t-o file\t\toutput file\n");
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14 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
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15 fprintf(stderr, "\t-S n\t\tseed\n");
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16 exit(0);
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17 }
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18
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19 int main(int argc, char *argv[]) {
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20 FILE *in = stdin;
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21 FILE *out = stdout;
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22 FILE *sig = NULL;
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23
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24 char output_name[MAXPATHLEN] = "(stdout)";
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25 char input_name[MAXPATHLEN] = "(stdin)";
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26 char signature_name[MAXPATHLEN];
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27
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28 int c;
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29 int i;
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30 int n = 100, nb;
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31 double a = 0.25;
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32 double g = 1.0;
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33 int s = 0;
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34
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35 progname = argv[0];
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36
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37 #ifdef __EMX__
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38 _fsetmode(in, "b");
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39 _fsetmode(out, "b");
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40 #endif
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41
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42 while ((c = getopt(argc, argv, "a:g:h?n:o:s:S:")) != EOF) {
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43 switch (c) {
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44 case 'a':
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45 a = atof(optarg);
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46 if (a <= 0.0) {
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47 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, a);
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48 exit(1);
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49 }
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50 break;
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51 case 'g':
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52 g = atof(optarg);
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53 if (g <= 0.0) {
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54 fprintf(stderr, "%s: gamma factor %f out of range\n", progname, a);
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55 exit(1);
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56 }
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57 break;
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58 case 'h':
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59 case '?':
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60 usage();
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61 break;
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62 case 'n':
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63 n = atoi(optarg);
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64 if (n < 1 || n > 1000) {
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65 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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66 exit(1);
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67 }
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68 break;
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69 case 'o':
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70 if ((out = fopen(optarg, "w")) == NULL) {
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71 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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72 exit(1);
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73 }
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74 strcpy(output_name, optarg);
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75 break;
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76 case 's':
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77 if ((sig = fopen(optarg, "r")) == NULL) {
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78 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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79 exit(1);
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80 }
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81 strcpy(signature_name, optarg);
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82 break;
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83 case 'S':
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84 s = atoi(optarg);
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85 break;
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86 }
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87 }
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88
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89 argc -= optind;
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90 argv += optind;
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91
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92 if (argc > 1) {
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93 usage();
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94 exit(1);
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95 }
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96
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8
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97 if (argc == 1 && *argv[0] != '-') {
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98 if ((in = fopen(argv[0], "rb")) == NULL) {
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99 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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100 exit(1);
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101 }
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102 else
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103 strcpy(input_name, argv[0]);
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0
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104 }
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105
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106 if (!s)
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107 s = time(NULL) * getpid();
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108 srandom(s);
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109
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110 if (sig) {
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111 char line[128];
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112 fgets(line, sizeof(line), sig);
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113 if (strspn(line, "FR2SG") >= 5) {
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114 }
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115 else {
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116 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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117 exit(1);
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118 }
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119 fclose(sig);
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120 }
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121
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122 if (n > 0) {
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123 nb = fread(signature, sizeof(char), i = NBITSTOBYTES(n), in);
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124 if (nb < i) {
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125 fprintf(stderr, "%s: failed to read all %d signature bits from %s\n", progname, n, input_name);
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126 exit(1);
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127 }
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128 }
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129 else {
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130 if (fscanf(in, "%128[^\n\r]", signature) == EOF) {
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131 fprintf(stderr, "%s: failed to read signature bits from %s\n", progname, input_name);
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132 exit(1);
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133 }
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134 nb = strlen(signature);
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135 n = NBYTESTOBITS(nb);
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136 fprintf(stderr, "%s: got %d signature bits\n", progname, n);
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137 }
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138
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139 fprintf(out, "FR2SG\n");
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140 fprintf(out, "%d\n", n);
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141 fprintf(out, "%f\n", a);
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142 fprintf(out, "%f\n", g);
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143 fprintf(out, "%d\n", s);
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144 fwrite(signature, sizeof(char), nb, out);
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145 fprintf(out, "\n");
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146
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147 fclose(out);
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148
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149 exit(0);
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150 }
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