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1 #include "wm.h"
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2 #include "dct.h"
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3 #include "signature.h"
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4 #include "coord.h"
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5 #include "pgm.h"
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6
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7 char *progname;
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8
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9 void usage(void) {
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10 fprintf(stderr, "usage: %s [-h] [-l n] [-o file] [-q n] [-v n] -s file file\n\n", progname);
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11 fprintf(stderr, "\t-h\t\tprint usage\n");
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12 fprintf(stderr, "\t-l n\t\tsignature robustness factor\n");
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13 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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14 fprintf(stderr, "\t-q n\t\tquantization (JPEG quality) factor\n");
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15 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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16 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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17 exit(0);
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18 }
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19
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20 int main(int argc, char *argv[]) {
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21
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22 FILE *in = stdin;
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23 FILE *out = stdout;
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24 FILE *sig = NULL;
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25
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26 gray **image;
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27 struct coords *coords;
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28
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29 char signature_name[MAXPATHLEN];
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30 char input_name[MAXPATHLEN] = "(stdin)";
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31 char output_name[MAXPATHLEN] = "(stdout)";
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32
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33 int c;
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34 int n;
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35
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36 int rows, cols, format;
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37 gray maxval;
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8
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38 int row;
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0
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39
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40 int seed;
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41 int verbose = 0;
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42
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43 double quality = 0.0;
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44 int quantization = 0;
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45
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46 double **dcts;
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47
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48 progname = argv[0];
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49
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50 pgm_init(&argc, argv); wm_init();
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51
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52 while ((c = getopt(argc, argv, "h?i:l:o:q:s:v:")) != EOF) {
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53 switch (c) {
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54 case 'h':
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55 case '?':
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56 usage();
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57 break;
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58 case 'l':
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59 quality = atof(optarg);
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60 if (quality <= 0.0) {
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61 fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, quality);
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62 exit(1);
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63 }
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64 break;
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65 case 'o':
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66 if ((out = fopen(optarg, "wb")) == NULL) {
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67 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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68 exit(1);
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69 }
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70 strcpy(output_name, optarg);
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71 break;
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72 case 'q':
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73 quantization = atoi(optarg);
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74 if (quantization <= 0 || quantization > 100) {
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75 fprintf(stderr, "%s: quantization factor %d out of range\n", progname, quantization);
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76 exit(1);
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77 }
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78 break;
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79 case 's':
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80 if ((sig = fopen(optarg, "r")) == NULL) {
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81 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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82 exit(1);
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83 }
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84 strcpy(signature_name, optarg);
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85 break;
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86 case 'v':
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87 verbose = atoi(optarg);
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88 if (verbose < 0) {
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89 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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90 exit(1);
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91 }
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92 break;
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93 }
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94 }
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95
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96 argc -= optind;
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97 argv += optind;
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98
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99 if (argc > 1) {
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100 usage();
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101 exit(1);
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102 }
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103
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8
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104 if (argc == 1 && *argv[0] != '-') {
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0
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105 if ((in = fopen(argv[0], "rb")) == NULL) {
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106 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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107 exit(1);
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108 }
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109 else
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110 strcpy(input_name, argv[0]);
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8
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111 }
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112
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0
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113 if (sig) {
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114 char line[128];
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115 fgets(line, sizeof(line), sig);
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116 if (strspn(line, "KCSG") >= 4) {
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117 fscanf(sig, "%d\n", &nbit_signature);
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118 n_signature = NBITSTOBYTES(nbit_signature);
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119 if (quality == 0.0)
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120 fscanf(sig, "%lf\n", &quality);
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121 else
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122 fscanf(sig, "%*lf\n");
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123 if (quantization == 0)
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124 fscanf(sig, "%d\n", &quantization);
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125 else
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126 fscanf(sig, "%*d\n");
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127 fscanf(sig, "%d\n", &seed);
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128 srandom(seed);
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129 fread(signature, sizeof(char), n_signature, sig);
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130 init_signature_bits();
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131 fscanf(sig, "\n");
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132 }
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133 else {
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134 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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135 exit(1);
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136 }
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137 fclose(sig);
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138 }
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139 else {
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140 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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141 exit(1);
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142 }
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143
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144 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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145
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146 if (cols % NJPEG) {
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147 fprintf(stderr, "%s: image width %d not a multiple of %d\n", progname, cols, NJPEG);
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148 exit(1);
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149 }
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150
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151 if (rows % NJPEG) {
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152 fprintf(stderr, "%s: image height %d not a multiple of %d\n", progname, rows, NJPEG);
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153 exit(1);
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154 }
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155
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156 if ((rows * cols) / (NJPEG * NJPEG) < nbit_signature) {
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157 fprintf(stderr, "%s: image too small to extract %d bits of signature\n", progname, nbit_signature);
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158 exit(1);
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159 }
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160
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161 init_dct_8x8();
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162 init_quantum_JPEG_lumin(quantization);
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163
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164 dcts = alloc_coeffs_8x8();
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165
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166 if ((coords = alloc_coords(nbit_signature)) == NULL) {
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167 fprintf(stderr, "%s: unable to allocate memory\n", progname);
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168 exit(1);
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169 }
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170
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171 image = pgm_allocarray(cols, rows);
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172
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173 for (row = 0; row < rows; row++)
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174 pgm_readpgmrow(in, image[row], cols, maxval, format);
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175
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176 fclose(in);
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177
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178 n = 0;
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179 while (n < nbit_signature) {
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180 int xb;
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181 int yb;
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182 int c1, c2;
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183 double v1, v2;
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184
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185 do {
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186 xb = random() % (cols / NJPEG);
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187 yb = random() % (rows / NJPEG);
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188 } while (add_coord(coords, xb, yb) < 0);
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189
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190 fdct_block_8x8(image, xb * NJPEG, yb * NJPEG, dcts);
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191
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192 do {
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193 c1 = (random() % (NJPEG * NJPEG - 2)) + 1;
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194 c2 = (random() % (NJPEG * NJPEG - 2)) + 1;
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195 } while (c1 == c2 || !is_middle_frequency_coeff_8x8(c1) || !is_middle_frequency_coeff_8x8(c2));
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196
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197 quantize_8x8(dcts);
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198
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199 if (verbose >= 1)
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200 fprintf(stderr, "%d: quantized DCT block (x %d/y %d), extracting (x %d/y %d), (x %d/y %d) ", n, xb * NJPEG, yb * NJPEG, c1 % NJPEG, c1 / NJPEG, c2 % NJPEG, c2 / NJPEG);
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201
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202 v1 = dcts[c1 / NJPEG][c1 % NJPEG];
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203 v2 = dcts[c2 / NJPEG][c2 % NJPEG];
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204
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205 if (fabs(v1) > fabs(v2)) {
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206 set_signature_bit(n, 1);
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207 if (verbose >= 1)
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208 fprintf(stderr, "HIGH\n");
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209 }
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210 else {
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211 set_signature_bit(n, 0);
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212 if (verbose >= 1)
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213 fprintf(stderr, "LOW\n");
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214 }
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215
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216 if (verbose >= 2)
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217 print_coeffs_8x8(dcts);
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218
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219 n++;
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220 }
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221
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222 fprintf(out, "KCWM\n");
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223 fprintf(out, "%d\n", nbit_signature);
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224 fwrite(signature, sizeof(char), n_signature, out);
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225 fprintf(out, "\n");
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226
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227 fclose(out);
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228
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229 free_coeffs(dcts);
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230
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231 pbm_freearray(image, rows);
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232
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233 exit(0);
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234 }
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