Mercurial > hg > wm
annotate Meerwald-dir/wm_koch_d.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/wm_koch_d.c@4987db85cfae |
| children |
| rev | line source |
|---|---|
| 0 | 1 #include "wm.h" |
| 2 #include "dct.h" | |
| 3 #include "signature.h" | |
| 4 #include "coord.h" | |
|
24
9f20bce6184e
move directories, support netpbm 11
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
parents:
16
diff
changeset
|
5 #include "netpbm/pgm.h" |
| 0 | 6 |
| 7 char *progname; | |
| 8 | |
| 9 void usage(void) { | |
| 10 fprintf(stderr, "usage: %s [-h] [-l n] [-o file] [-q n] [-v n] -s file file\n\n", progname); | |
| 11 fprintf(stderr, "\t-h\t\tprint usage\n"); | |
| 12 fprintf(stderr, "\t-l n\t\tsignature robustness factor\n"); | |
| 13 fprintf(stderr, "\t-o file\t\textracted signature file\n"); | |
| 14 fprintf(stderr, "\t-q n\t\tquantization (JPEG quality) factor\n"); | |
| 15 fprintf(stderr, "\t-s file\t\toriginal signature file\n"); | |
| 16 fprintf(stderr, "\t-v n\t\tverbosity level\n"); | |
| 17 exit(0); | |
| 18 } | |
| 19 | |
| 20 int main(int argc, char *argv[]) { | |
| 21 | |
| 22 FILE *in = stdin; | |
| 23 FILE *out = stdout; | |
| 24 FILE *sig = NULL; | |
| 25 | |
| 26 gray **image; | |
| 27 struct coords *coords; | |
| 28 | |
| 29 char signature_name[MAXPATHLEN]; | |
| 30 char input_name[MAXPATHLEN] = "(stdin)"; | |
| 31 char output_name[MAXPATHLEN] = "(stdout)"; | |
| 32 | |
| 33 int c; | |
| 34 int n; | |
| 35 | |
| 36 int rows, cols, format; | |
| 37 gray maxval; | |
| 8 | 38 int row; |
| 0 | 39 |
| 40 int seed; | |
| 41 int verbose = 0; | |
| 42 | |
| 43 double quality = 0.0; | |
| 44 int quantization = 0; | |
| 45 | |
| 46 double **dcts; | |
| 47 | |
| 48 progname = argv[0]; | |
| 49 | |
| 50 pgm_init(&argc, argv); wm_init(); | |
| 51 | |
| 52 while ((c = getopt(argc, argv, "h?i:l:o:q:s:v:")) != EOF) { | |
| 53 switch (c) { | |
| 54 case 'h': | |
| 55 case '?': | |
| 56 usage(); | |
| 57 break; | |
| 58 case 'l': | |
| 59 quality = atof(optarg); | |
| 60 if (quality <= 0.0) { | |
| 61 fprintf(stderr, "%s: signature strength factor %f out of range\n", progname, quality); | |
| 62 exit(1); | |
| 63 } | |
| 64 break; | |
| 65 case 'o': | |
| 66 if ((out = fopen(optarg, "wb")) == NULL) { | |
| 67 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg); | |
| 68 exit(1); | |
| 69 } | |
| 70 strcpy(output_name, optarg); | |
| 71 break; | |
| 72 case 'q': | |
| 73 quantization = atoi(optarg); | |
| 74 if (quantization <= 0 || quantization > 100) { | |
| 75 fprintf(stderr, "%s: quantization factor %d out of range\n", progname, quantization); | |
| 76 exit(1); | |
| 77 } | |
| 78 break; | |
| 79 case 's': | |
| 80 if ((sig = fopen(optarg, "r")) == NULL) { | |
| 81 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg); | |
| 82 exit(1); | |
| 83 } | |
| 84 strcpy(signature_name, optarg); | |
| 85 break; | |
| 86 case 'v': | |
| 87 verbose = atoi(optarg); | |
| 88 if (verbose < 0) { | |
| 89 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose); | |
| 90 exit(1); | |
| 91 } | |
| 92 break; | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 argc -= optind; | |
| 97 argv += optind; | |
| 98 | |
| 99 if (argc > 1) { | |
| 100 usage(); | |
| 101 exit(1); | |
| 102 } | |
| 103 | |
| 8 | 104 if (argc == 1 && *argv[0] != '-') { |
| 0 | 105 if ((in = fopen(argv[0], "rb")) == NULL) { |
| 106 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]); | |
| 107 exit(1); | |
| 108 } | |
| 109 else | |
| 110 strcpy(input_name, argv[0]); | |
| 8 | 111 } |
| 112 | |
| 0 | 113 if (sig) { |
| 114 char line[128]; | |
| 115 fgets(line, sizeof(line), sig); | |
| 116 if (strspn(line, "KCSG") >= 4) { | |
| 117 fscanf(sig, "%d\n", &nbit_signature); | |
| 118 n_signature = NBITSTOBYTES(nbit_signature); | |
| 119 if (quality == 0.0) | |
| 120 fscanf(sig, "%lf\n", &quality); | |
| 121 else | |
|
16
4987db85cfae
fix another scanf() warning
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
8
diff
changeset
|
122 fscanf(sig, "%*f\n"); |
| 0 | 123 if (quantization == 0) |
| 124 fscanf(sig, "%d\n", &quantization); | |
| 125 else | |
| 126 fscanf(sig, "%*d\n"); | |
| 127 fscanf(sig, "%d\n", &seed); | |
| 128 srandom(seed); | |
| 129 fread(signature, sizeof(char), n_signature, sig); | |
| 130 init_signature_bits(); | |
| 131 fscanf(sig, "\n"); | |
| 132 } | |
| 133 else { | |
| 134 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name); | |
| 135 exit(1); | |
| 136 } | |
| 137 fclose(sig); | |
| 138 } | |
| 139 else { | |
| 140 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname); | |
| 141 exit(1); | |
| 142 } | |
| 143 | |
| 144 pgm_readpgminit(in, &cols, &rows, &maxval, &format); | |
| 145 | |
| 146 if (cols % NJPEG) { | |
| 147 fprintf(stderr, "%s: image width %d not a multiple of %d\n", progname, cols, NJPEG); | |
| 148 exit(1); | |
| 149 } | |
| 150 | |
| 151 if (rows % NJPEG) { | |
| 152 fprintf(stderr, "%s: image height %d not a multiple of %d\n", progname, rows, NJPEG); | |
| 153 exit(1); | |
| 154 } | |
| 155 | |
| 156 if ((rows * cols) / (NJPEG * NJPEG) < nbit_signature) { | |
| 157 fprintf(stderr, "%s: image too small to extract %d bits of signature\n", progname, nbit_signature); | |
| 158 exit(1); | |
| 159 } | |
| 160 | |
| 161 init_dct_8x8(); | |
| 162 init_quantum_JPEG_lumin(quantization); | |
| 163 | |
| 164 dcts = alloc_coeffs_8x8(); | |
| 165 | |
| 166 if ((coords = alloc_coords(nbit_signature)) == NULL) { | |
| 167 fprintf(stderr, "%s: unable to allocate memory\n", progname); | |
| 168 exit(1); | |
| 169 } | |
| 170 | |
| 171 image = pgm_allocarray(cols, rows); | |
| 172 | |
| 173 for (row = 0; row < rows; row++) | |
| 174 pgm_readpgmrow(in, image[row], cols, maxval, format); | |
| 175 | |
| 176 fclose(in); | |
| 177 | |
| 178 n = 0; | |
| 179 while (n < nbit_signature) { | |
| 180 int xb; | |
| 181 int yb; | |
| 182 int c1, c2; | |
| 183 double v1, v2; | |
| 184 | |
| 185 do { | |
| 186 xb = random() % (cols / NJPEG); | |
| 187 yb = random() % (rows / NJPEG); | |
| 188 } while (add_coord(coords, xb, yb) < 0); | |
| 189 | |
| 190 fdct_block_8x8(image, xb * NJPEG, yb * NJPEG, dcts); | |
| 191 | |
| 192 do { | |
| 193 c1 = (random() % (NJPEG * NJPEG - 2)) + 1; | |
| 194 c2 = (random() % (NJPEG * NJPEG - 2)) + 1; | |
| 195 } while (c1 == c2 || !is_middle_frequency_coeff_8x8(c1) || !is_middle_frequency_coeff_8x8(c2)); | |
| 196 | |
| 197 quantize_8x8(dcts); | |
| 198 | |
| 199 if (verbose >= 1) | |
| 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); | |
| 201 | |
| 202 v1 = dcts[c1 / NJPEG][c1 % NJPEG]; | |
| 203 v2 = dcts[c2 / NJPEG][c2 % NJPEG]; | |
| 204 | |
| 205 if (fabs(v1) > fabs(v2)) { | |
| 206 set_signature_bit(n, 1); | |
| 207 if (verbose >= 1) | |
| 208 fprintf(stderr, "HIGH\n"); | |
| 209 } | |
| 210 else { | |
| 211 set_signature_bit(n, 0); | |
| 212 if (verbose >= 1) | |
| 213 fprintf(stderr, "LOW\n"); | |
| 214 } | |
| 215 | |
| 216 if (verbose >= 2) | |
| 217 print_coeffs_8x8(dcts); | |
| 218 | |
| 219 n++; | |
| 220 } | |
| 221 | |
| 222 fprintf(out, "KCWM\n"); | |
| 223 fprintf(out, "%d\n", nbit_signature); | |
| 224 fwrite(signature, sizeof(char), n_signature, out); | |
| 225 fprintf(out, "\n"); | |
| 226 | |
| 227 fclose(out); | |
| 228 | |
| 229 free_coeffs(dcts); | |
| 230 | |
| 231 pbm_freearray(image, rows); | |
| 232 | |
| 233 exit(0); | |
| 234 } |