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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 [-l n] [-n n] [-o file] [-q n] [-s file] [-S n] file\n\n", progname);
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8 fprintf(stderr, "\t-h\t\tprint usage\n");
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9 fprintf(stderr, "\t-l n\t\tsignature strength factor (default 5.0)\n");
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10 fprintf(stderr, "\t-n n\t\twatermark bit length\n");
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11 fprintf(stderr, "\t-o file\t\toutput file\n");
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12 fprintf(stderr, "\t-q n\t\tquantization (JPEG quality) factor (default 90)\n");
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13 fprintf(stderr, "\t-s file\t\tuse signature file's embedding information\n");
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14 fprintf(stderr, "\t-S n\t\tseed\n");
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15 exit(0);
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16 }
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17
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18 int main(int argc, char *argv[]) {
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19 FILE *in = stdin;
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20 FILE *out = stdout;
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21 FILE *sig = NULL;
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22
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23 char output_name[MAXPATHLEN] = "(stdout)";
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24 char input_name[MAXPATHLEN] = "(stdin)";
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25 char signature_name[MAXPATHLEN];
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26
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27 int c;
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28 int i;
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29 int n = 0;
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30 int nb;
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31 int s = 0;
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32 int q = 90;
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33 double l = 5.0;
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34
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35 progname = argv[0]; wm_init();
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36
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37 while ((c = getopt(argc, argv, "h?l:n:o:q:s:S:")) != EOF) {
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38 switch (c) {
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39 case 'h':
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40 case '?':
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41 usage();
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42 break;
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43 case 'l':
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44 l = atof(optarg);
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45 if (l <= 0.0) {
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46 fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, l);
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47 exit(1);
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48 }
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49 break;
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50 case 'n':
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51 n = atoi(optarg);
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52 if (n < 1 || n > 1000) {
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53 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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54 exit(1);
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55 }
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56 break;
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57 case 'o':
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58 if ((out = fopen(optarg, "wb")) == NULL) {
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59 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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60 exit(1);
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61 }
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62 strcpy(output_name, optarg);
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63 break;
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64 case 'q':
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65 q = atoi(optarg);
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66 if (q <= 0 || q > 100) {
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67 fprintf(stderr, "%s: quantization factor %f out of range\n", progname, q);
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68 exit(1);
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69 }
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70 break;
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71 case 's':
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72 if ((sig = fopen(optarg, "r")) == NULL) {
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73 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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74 exit(1);
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75 }
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76 strcpy(signature_name, optarg);
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77 break;
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78 case 'S':
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79 s = atoi(optarg);
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80 break;
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81 }
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82 }
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83
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84 argc -= optind;
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85 argv += optind;
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86
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87 if (argc > 1) {
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88 usage();
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89 exit(1);
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90 }
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91
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92 if (argc == 1 && *argv[0] != '-')
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93 if ((in = fopen(argv[0], "rb")) == NULL) {
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94 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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95 exit(1);
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96 }
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97 else
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98 strcpy(input_name, argv[0]);
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99
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100 if (s)
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101 srandom(s);
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102 else
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103 srandom(time(NULL) * getpid());
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104
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105 if (sig) {
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106 char line[128];
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107 fgets(line, sizeof(line), sig);
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108 if (strspn(line, "KCSG") >= 4) {
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109 if (n == 0)
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110 fscanf(sig, "%d\n", &n);
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111 else
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112 fscanf(sig, "%*d\n");
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113 if (l == 0.0)
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114 fscanf(sig, "%lf\n", &l);
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115 else
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116 fscanf(sig, "%*lf\n");
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117 if (q == 0)
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118 fscanf(sig, "%d\n", &q);
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119 else
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120 fscanf(sig, "%*d\n");
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121 }
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122 else {
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123 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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124 exit(1);
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125 }
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126 fclose(sig);
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127 }
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128
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129 if (n > 0) {
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130 nb = fread(signature, sizeof(char), i = NBITSTOBYTES(n), in);
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131 if (nb < i) {
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132 fprintf(stderr, "%s: failed to read all %d signature bits from %s\n", progname, n, input_name);
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133 exit(1);
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134 }
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135 }
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136 else {
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137 if (fscanf(in, "%128[^\n\r]", signature) == EOF) {
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138 fprintf(stderr, "%s: failed to read signature bits from %s\n", progname, input_name);
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139 exit(1);
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140 }
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141 nb = strlen(signature);
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142 n = NBYTESTOBITS(nb);
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143 fprintf(stderr, "%s: got %d signature bits\n", progname, n);
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144 }
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145
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146 fprintf(out, "KCSG\n");
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147 fprintf(out, "%d\n", n);
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148 fprintf(out, "%f\n", l);
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149 fprintf(out, "%d\n", q);
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150 fprintf(out, "%d\n", random());
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151 fwrite(signature, sizeof(char), nb, out);
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152 fprintf(out, "\n");
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153
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154 fclose(out);
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155
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156 exit(0);
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157 }
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