tools/fit_image.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2004
   5  * DENX Software Engineering
   6  * Wolfgang Denk, wd@denx.de
   7  *
   8  * Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
   9  *              FIT image specific code abstracted from mkimage.c
  10  *              some functions added to address abstraction
  11  *
  12  * All rights reserved.
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include "imagetool.h"
  18 #include "fit_common.h"
  19 #include "mkimage.h"
  20 #include <image.h>
  21 #include <stdarg.h>
  22 #include <version.h>
  23 #include <u-boot/crc.h>
  24
  25 static image_header_t header;
  26
  27 static int fit_add_file_data(struct image_tool_params *params, size_t size_inc,
  28                              const char *tmpfile)
  29 {
  30         int tfd, destfd = 0;
  31         void *dest_blob = NULL;
  32         off_t destfd_size = 0;
  33         struct stat sbuf;
  34         void *ptr;
  35         int ret = 0;
  36
  37         tfd = mmap_fdt(params->cmdname, tmpfile, size_inc, &ptr, &sbuf, true);
  38         if (tfd < 0)
  39                 return -EIO;
  40
  41         if (params->keydest) {
  42                 struct stat dest_sbuf;
  43
  44                 destfd = mmap_fdt(params->cmdname, params->keydest, size_inc,
  45                                   &dest_blob, &dest_sbuf, false);
  46                 if (destfd < 0) {
  47                         ret = -EIO;
  48                         goto err_keydest;
  49                 }
  50                 destfd_size = dest_sbuf.st_size;
  51         }
  52
  53         /* for first image creation, add a timestamp at offset 0 i.e., root  */
  54         if (params->datafile) {
  55                 time_t time = imagetool_get_source_date(params, sbuf.st_mtime);
  56                 ret = fit_set_timestamp(ptr, 0, time);
  57         }
  58
  59         if (!ret) {
  60                 ret = fit_add_verification_data(params->keydir, dest_blob, ptr,
  61                                                 params->comment,
  62                                                 params->require_keys);
  63         }
  64
  65         if (dest_blob) {
  66                 munmap(dest_blob, destfd_size);
  67                 close(destfd);
  68         }
  69
  70 err_keydest:
  71         munmap(ptr, sbuf.st_size);
  72         close(tfd);
  73
  74         return ret;
  75 }
  76
  77 /**
  78  * fit_calc_size() - Calculate the approximate size of the FIT we will generate
  79  */
  80 static int fit_calc_size(struct image_tool_params *params)
  81 {
  82         struct content_info *cont;
  83         int size, total_size;
  84
  85         size = imagetool_get_filesize(params, params->datafile);
  86         if (size < 0)
  87                 return -1;
  88
  89         total_size = size;
  90         for (cont = params->content_head; cont; cont = cont->next) {
  91                 size = imagetool_get_filesize(params, cont->fname);
  92                 if (size < 0)
  93                         return -1;
  94
  95                 /* Add space for properties */
  96                 total_size += size + 300;
  97         }
  98
  99         /* Add plenty of space for headers, properties, nodes, etc. */
 100         total_size += 4096;
 101
 102         return total_size;
 103 }
 104
 105 static int fdt_property_file(struct image_tool_params *params,
 106                              void *fdt, const char *name, const char *fname)
 107 {
 108         struct stat sbuf;
 109         void *ptr;
 110         int ret;
 111         int fd;
 112
 113         fd = open(fname, O_RDWR | O_BINARY);
 114         if (fd < 0) {
 115                 fprintf(stderr, "%s: Can't open %s: %s\n",
 116                         params->cmdname, fname, strerror(errno));
 117                 return -1;
 118         }
 119
 120         if (fstat(fd, &sbuf) < 0) {
 121                 fprintf(stderr, "%s: Can't stat %s: %s\n",
 122                         params->cmdname, fname, strerror(errno));
 123                 goto err;
 124         }
 125
 126         ret = fdt_property_placeholder(fdt, "data", sbuf.st_size, &ptr);
 127         if (ret)
 128                 goto err;
 129         ret = read(fd, ptr, sbuf.st_size);
 130         if (ret != sbuf.st_size) {
 131                 fprintf(stderr, "%s: Can't read %s: %s\n",
 132                         params->cmdname, fname, strerror(errno));
 133                 goto err;
 134         }
 135         close(fd);
 136
 137         return 0;
 138 err:
 139         close(fd);
 140         return -1;
 141 }
 142
 143 static int fdt_property_strf(void *fdt, const char *name, const char *fmt, ...)
 144 {
 145         char str[100];
 146         va_list ptr;
 147
 148         va_start(ptr, fmt);
 149         vsnprintf(str, sizeof(str), fmt, ptr);
 150         va_end(ptr);
 151         return fdt_property_string(fdt, name, str);
 152 }
 153
 154 static void get_basename(char *str, int size, const char *fname)
 155 {
 156         const char *p, *start, *end;
 157         int len;
 158
 159         /*
 160          * Use the base name as the 'name' field. So for example:
 161          *
 162          * "arch/arm/dts/sun7i-a20-bananapro.dtb"
 163          * becomes "sun7i-a20-bananapro"
 164          */
 165         p = strrchr(fname, '/');
 166         start = p ? p + 1 : fname;
 167         p = strrchr(fname, '.');
 168         end = p ? p : fname + strlen(fname);
 169         len = end - start;
 170         if (len >= size)
 171                 len = size - 1;
 172         memcpy(str, start, len);
 173         str[len] = '\0';
 174 }
 175
 176 /**
 177  * fit_write_images() - Write out a list of images to the FIT
 178  *
 179  * We always include the main image (params->datafile). If there are device
 180  * tree files, we include an fdt@ node for each of those too.
 181  */
 182 static int fit_write_images(struct image_tool_params *params, char *fdt)
 183 {
 184         struct content_info *cont;
 185         const char *typename;
 186         char str[100];
 187         int upto;
 188         int ret;
 189
 190         fdt_begin_node(fdt, "images");
 191
 192         /* First the main image */
 193         typename = genimg_get_type_short_name(params->fit_image_type);
 194         snprintf(str, sizeof(str), "%s@1", typename);
 195         fdt_begin_node(fdt, str);
 196         fdt_property_string(fdt, "description", params->imagename);
 197         fdt_property_string(fdt, "type", typename);
 198         fdt_property_string(fdt, "arch",
 199                             genimg_get_arch_short_name(params->arch));
 200         fdt_property_string(fdt, "os", genimg_get_os_short_name(params->os));
 201         fdt_property_string(fdt, "compression",
 202                             genimg_get_comp_short_name(params->comp));
 203         fdt_property_u32(fdt, "load", params->addr);
 204         fdt_property_u32(fdt, "entry", params->ep);
 205
 206         /*
 207          * Put data last since it is large. SPL may only load the first part
 208          * of the DT, so this way it can access all the above fields.
 209          */
 210         ret = fdt_property_file(params, fdt, "data", params->datafile);
 211         if (ret)
 212                 return ret;
 213         fdt_end_node(fdt);
 214
 215         /* Now the device tree files if available */
 216         upto = 0;
 217         for (cont = params->content_head; cont; cont = cont->next) {
 218                 if (cont->type != IH_TYPE_FLATDT)
 219                         continue;
 220                 snprintf(str, sizeof(str), "%s@%d", FIT_FDT_PROP, ++upto);
 221                 fdt_begin_node(fdt, str);
 222
 223                 get_basename(str, sizeof(str), cont->fname);
 224                 fdt_property_string(fdt, "description", str);
 225                 ret = fdt_property_file(params, fdt, "data", cont->fname);
 226                 if (ret)
 227                         return ret;
 228                 fdt_property_string(fdt, "type", typename);
 229                 fdt_property_string(fdt, "arch",
 230                                     genimg_get_arch_short_name(params->arch));
 231                 fdt_property_string(fdt, "compression",
 232                                     genimg_get_comp_short_name(IH_COMP_NONE));
 233                 fdt_end_node(fdt);
 234         }
 235
 236         fdt_end_node(fdt);
 237
 238         return 0;
 239 }
 240
 241 /**
 242  * fit_write_configs() - Write out a list of configurations to the FIT
 243  *
 244  * If there are device tree files, we include a configuration for each, which
 245  * selects the main image (params->datafile) and its corresponding device
 246  * tree file.
 247  *
 248  * Otherwise we just create a configuration with the main image in it.
 249  */
 250 static void fit_write_configs(struct image_tool_params *params, char *fdt)
 251 {
 252         struct content_info *cont;
 253         const char *typename;
 254         char str[100];
 255         int upto;
 256
 257         fdt_begin_node(fdt, "configurations");
 258         fdt_property_string(fdt, "default", "conf@1");
 259
 260         upto = 0;
 261         for (cont = params->content_head; cont; cont = cont->next) {
 262                 if (cont->type != IH_TYPE_FLATDT)
 263                         continue;
 264                 typename = genimg_get_type_short_name(cont->type);
 265                 snprintf(str, sizeof(str), "conf@%d", ++upto);
 266                 fdt_begin_node(fdt, str);
 267
 268                 get_basename(str, sizeof(str), cont->fname);
 269                 fdt_property_string(fdt, "description", str);
 270
 271                 typename = genimg_get_type_short_name(params->fit_image_type);
 272                 snprintf(str, sizeof(str), "%s@1", typename);
 273                 fdt_property_string(fdt, typename, str);
 274
 275                 snprintf(str, sizeof(str), FIT_FDT_PROP "@%d", upto);
 276                 fdt_property_string(fdt, FIT_FDT_PROP, str);
 277                 fdt_end_node(fdt);
 278         }
 279         if (!upto) {
 280                 fdt_begin_node(fdt, "conf@1");
 281                 typename = genimg_get_type_short_name(params->fit_image_type);
 282                 snprintf(str, sizeof(str), "%s@1", typename);
 283                 fdt_property_string(fdt, typename, str);
 284                 fdt_end_node(fdt);
 285         }
 286
 287         fdt_end_node(fdt);
 288 }
 289
 290 static int fit_build_fdt(struct image_tool_params *params, char *fdt, int size)
 291 {
 292         int ret;
 293
 294         ret = fdt_create(fdt, size);
 295         if (ret)
 296                 return ret;
 297         fdt_finish_reservemap(fdt);
 298         fdt_begin_node(fdt, "");
 299         fdt_property_strf(fdt, "description",
 300                           "%s image with one or more FDT blobs",
 301                           genimg_get_type_name(params->fit_image_type));
 302         fdt_property_strf(fdt, "creator", "U-Boot mkimage %s", PLAIN_VERSION);
 303         fdt_property_u32(fdt, "#address-cells", 1);
 304         ret = fit_write_images(params, fdt);
 305         if (ret)
 306                 return ret;
 307         fit_write_configs(params, fdt);
 308         fdt_end_node(fdt);
 309         ret = fdt_finish(fdt);
 310         if (ret)
 311                 return ret;
 312
 313         return fdt_totalsize(fdt);
 314 }
 315
 316 static int fit_build(struct image_tool_params *params, const char *fname)
 317 {
 318         char *buf;
 319         int size;
 320         int ret;
 321         int fd;
 322
 323         size = fit_calc_size(params);
 324         if (size < 0)
 325                 return -1;
 326         buf = malloc(size);
 327         if (!buf) {
 328                 fprintf(stderr, "%s: Out of memory (%d bytes)\n",
 329                         params->cmdname, size);
 330                 return -1;
 331         }
 332         ret = fit_build_fdt(params, buf, size);
 333         if (ret < 0) {
 334                 fprintf(stderr, "%s: Failed to build FIT image\n",
 335                         params->cmdname);
 336                 goto err_buf;
 337         }
 338         size = ret;
 339         fd = open(fname, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666);
 340         if (fd < 0) {
 341                 fprintf(stderr, "%s: Can't open %s: %s\n",
 342                         params->cmdname, fname, strerror(errno));
 343                 goto err;
 344         }
 345         ret = write(fd, buf, size);
 346         if (ret != size) {
 347                 fprintf(stderr, "%s: Can't write %s: %s\n",
 348                         params->cmdname, fname, strerror(errno));
 349                 goto err;
 350         }
 351         close(fd);
 352         free(buf);
 353
 354         return 0;
 355 err:
 356         close(fd);
 357 err_buf:
 358         free(buf);
 359         return -1;
 360 }
 361
 362 /**
 363  * fit_extract_data() - Move all data outside the FIT
 364  *
 365  * This takes a normal FIT file and removes all the 'data' properties from it.
 366  * The data is placed in an area after the FIT so that it can be accessed
 367  * using an offset into that area. The 'data' properties turn into
 368  * 'data-offset' properties.
 369  *
 370  * This function cannot cope with FITs with 'data-offset' properties. All
 371  * data must be in 'data' properties on entry.
 372  */
 373 static int fit_extract_data(struct image_tool_params *params, const char *fname)
 374 {
 375         void *buf;
 376         int buf_ptr;
 377         int fit_size, new_size;
 378         int fd;
 379         struct stat sbuf;
 380         void *fdt;
 381         int ret;
 382         int images;
 383         int node;
 384
 385         fd = mmap_fdt(params->cmdname, fname, 0, &fdt, &sbuf, false);
 386         if (fd < 0)
 387                 return -EIO;
 388         fit_size = fdt_totalsize(fdt);
 389
 390         /* Allocate space to hold the image data we will extract */
 391         buf = malloc(fit_size);
 392         if (!buf) {
 393                 ret = -ENOMEM;
 394                 goto err_munmap;
 395         }
 396         buf_ptr = 0;
 397
 398         images = fdt_path_offset(fdt, FIT_IMAGES_PATH);
 399         if (images < 0) {
 400                 debug("%s: Cannot find /images node: %d\n", __func__, images);
 401                 ret = -EINVAL;
 402                 goto err_munmap;
 403         }
 404
 405         for (node = fdt_first_subnode(fdt, images);
 406              node >= 0;
 407              node = fdt_next_subnode(fdt, node)) {
 408                 const char *data;
 409                 int len;
 410
 411                 data = fdt_getprop(fdt, node, "data", &len);
 412                 if (!data)
 413                         continue;
 414                 memcpy(buf + buf_ptr, data, len);
 415                 debug("Extracting data size %x\n", len);
 416
 417                 ret = fdt_delprop(fdt, node, "data");
 418                 if (ret) {
 419                         ret = -EPERM;
 420                         goto err_munmap;
 421                 }
 422                 if (params->external_offset > 0) {
 423                         /* An external offset positions the data absolutely. */
 424                         fdt_setprop_u32(fdt, node, "data-position",
 425                                         params->external_offset + buf_ptr);
 426                 } else {
 427                         fdt_setprop_u32(fdt, node, "data-offset", buf_ptr);
 428                 }
 429                 fdt_setprop_u32(fdt, node, "data-size", len);
 430
 431                 buf_ptr += (len + 3) & ~3;
 432         }
 433
 434         /* Pack the FDT and place the data after it */
 435         fdt_pack(fdt);
 436
 437         debug("Size reduced from %x to %x\n", fit_size, fdt_totalsize(fdt));
 438         debug("External data size %x\n", buf_ptr);
 439         new_size = fdt_totalsize(fdt);
 440         new_size = (new_size + 3) & ~3;
 441         munmap(fdt, sbuf.st_size);
 442
 443         if (ftruncate(fd, new_size)) {
 444                 debug("%s: Failed to truncate file: %s\n", __func__,
 445                       strerror(errno));
 446                 ret = -EIO;
 447                 goto err;
 448         }
 449
 450         /* Check if an offset for the external data was set. */
 451         if (params->external_offset > 0) {
 452                 if (params->external_offset < new_size) {
 453                         debug("External offset %x overlaps FIT length %x",
 454                               params->external_offset, new_size);
 455                         ret = -EINVAL;
 456                         goto err;
 457                 }
 458                 new_size = params->external_offset;
 459         }
 460         if (lseek(fd, new_size, SEEK_SET) < 0) {
 461                 debug("%s: Failed to seek to end of file: %s\n", __func__,
 462                       strerror(errno));
 463                 ret = -EIO;
 464                 goto err;
 465         }
 466         if (write(fd, buf, buf_ptr) != buf_ptr) {
 467                 debug("%s: Failed to write external data to file %s\n",
 468                       __func__, strerror(errno));
 469                 ret = -EIO;
 470                 goto err;
 471         }
 472         close(fd);
 473         return 0;
 474
 475 err_munmap:
 476         munmap(fdt, sbuf.st_size);
 477 err:
 478         if (buf)
 479                 free(buf);
 480         close(fd);
 481         return ret;
 482 }
 483
 484 static int fit_import_data(struct image_tool_params *params, const char *fname)
 485 {
 486         void *fdt, *old_fdt;
 487         int fit_size, new_size, size, data_base;
 488         int fd;
 489         struct stat sbuf;
 490         int ret;
 491         int images;
 492         int node;
 493
 494         fd = mmap_fdt(params->cmdname, fname, 0, &old_fdt, &sbuf, false);
 495         if (fd < 0)
 496                 return -EIO;
 497         fit_size = fdt_totalsize(old_fdt);
 498         data_base = (fit_size + 3) & ~3;
 499
 500         /* Allocate space to hold the new FIT */
 501         size = sbuf.st_size + 16384;
 502         fdt = malloc(size);
 503         if (!fdt) {
 504                 fprintf(stderr, "%s: Failed to allocate memory (%d bytes)\n",
 505                         __func__, size);
 506                 ret = -ENOMEM;
 507                 goto err;
 508         }
 509         ret = fdt_open_into(old_fdt, fdt, size);
 510         if (ret) {
 511                 debug("%s: Failed to expand FIT: %s\n", __func__,
 512                       fdt_strerror(errno));
 513                 ret = -EINVAL;
 514                 goto err;
 515         }
 516
 517         images = fdt_path_offset(fdt, FIT_IMAGES_PATH);
 518         if (images < 0) {
 519                 debug("%s: Cannot find /images node: %d\n", __func__, images);
 520                 ret = -EINVAL;
 521                 goto err;
 522         }
 523
 524         for (node = fdt_first_subnode(fdt, images);
 525              node >= 0;
 526              node = fdt_next_subnode(fdt, node)) {
 527                 int buf_ptr;
 528                 int len;
 529
 530                 buf_ptr = fdtdec_get_int(fdt, node, "data-offset", -1);
 531                 len = fdtdec_get_int(fdt, node, "data-size", -1);
 532                 if (buf_ptr == -1 || len == -1)
 533                         continue;
 534                 debug("Importing data size %x\n", len);
 535
 536                 ret = fdt_setprop(fdt, node, "data", fdt + data_base + buf_ptr,
 537                                   len);
 538                 if (ret) {
 539                         debug("%s: Failed to write property: %s\n", __func__,
 540                               fdt_strerror(ret));
 541                         ret = -EINVAL;
 542                         goto err;
 543                 }
 544         }
 545
 546         munmap(old_fdt, sbuf.st_size);
 547         close(fd);
 548
 549         /* Pack the FDT and place the data after it */
 550         fdt_pack(fdt);
 551
 552         new_size = fdt_totalsize(fdt);
 553         debug("Size expanded from %x to %x\n", fit_size, new_size);
 554
 555         fd = open(fname, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666);
 556         if (fd < 0) {
 557                 fprintf(stderr, "%s: Can't open %s: %s\n",
 558                         params->cmdname, fname, strerror(errno));
 559                 free(fdt);
 560                 return -EIO;
 561         }
 562         if (write(fd, fdt, new_size) != new_size) {
 563                 debug("%s: Failed to write external data to file %s\n",
 564                       __func__, strerror(errno));
 565                 ret = -EIO;
 566                 goto err;
 567         }
 568
 569         ret = 0;
 570
 571 err:
 572         free(fdt);
 573         close(fd);
 574         return ret;
 575 }
 576
 577 /**
 578  * fit_handle_file - main FIT file processing function
 579  *
 580  * fit_handle_file() runs dtc to convert .its to .itb, includes
 581  * binary data, updates timestamp property and calculates hashes.
 582  *
 583  * datafile  - .its file
 584  * imagefile - .itb file
 585  *
 586  * returns:
 587  *     only on success, otherwise calls exit (EXIT_FAILURE);
 588  */
 589 static int fit_handle_file(struct image_tool_params *params)
 590 {
 591         char tmpfile[MKIMAGE_MAX_TMPFILE_LEN];
 592         char cmd[MKIMAGE_MAX_DTC_CMDLINE_LEN];
 593         size_t size_inc;
 594         int ret;
 595
 596         /* Flattened Image Tree (FIT) format  handling */
 597         debug ("FIT format handling\n");
 598
 599         /* call dtc to include binary properties into the tmp file */
 600         if (strlen (params->imagefile) +
 601                 strlen (MKIMAGE_TMPFILE_SUFFIX) + 1 > sizeof (tmpfile)) {
 602                 fprintf (stderr, "%s: Image file name (%s) too long, "
 603                                 "can't create tmpfile",
 604                                 params->imagefile, params->cmdname);
 605                 return (EXIT_FAILURE);
 606         }
 607         sprintf (tmpfile, "%s%s", params->imagefile, MKIMAGE_TMPFILE_SUFFIX);
 608
 609         /* We either compile the source file, or use the existing FIT image */
 610         if (params->auto_its) {
 611                 if (fit_build(params, tmpfile)) {
 612                         fprintf(stderr, "%s: failed to build FIT\n",
 613                                 params->cmdname);
 614                         return EXIT_FAILURE;
 615                 }
 616                 *cmd = '\0';
 617         } else if (params->datafile) {
 618                 /* dtc -I dts -O dtb -p 500 datafile > tmpfile */
 619                 snprintf(cmd, sizeof(cmd), "%s %s %s > %s",
 620                          MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
 621                 debug("Trying to execute \"%s\"\n", cmd);
 622         } else {
 623                 snprintf(cmd, sizeof(cmd), "cp %s %s",
 624                          params->imagefile, tmpfile);
 625         }
 626         if (*cmd && system(cmd) == -1) {
 627                 fprintf (stderr, "%s: system(%s) failed: %s\n",
 628                                 params->cmdname, cmd, strerror(errno));
 629                 goto err_system;
 630         }
 631
 632         /* Move the data so it is internal to the FIT, if needed */
 633         ret = fit_import_data(params, tmpfile);
 634         if (ret)
 635                 goto err_system;
 636
 637         /*
 638          * Set hashes for images in the blob. Unfortunately we may need more
 639          * space in either FDT, so keep trying until we succeed.
 640          *
 641          * Note: this is pretty inefficient for signing, since we must
 642          * calculate the signature every time. It would be better to calculate
 643          * all the data and then store it in a separate step. However, this
 644          * would be considerably more complex to implement. Generally a few
 645          * steps of this loop is enough to sign with several keys.
 646          */
 647         for (size_inc = 0; size_inc < 64 * 1024; size_inc += 1024) {
 648                 ret = fit_add_file_data(params, size_inc, tmpfile);
 649                 if (!ret || ret != -ENOSPC)
 650                         break;
 651         }
 652
 653         if (ret) {
 654                 fprintf(stderr, "%s Can't add hashes to FIT blob: %d\n",
 655                         params->cmdname, ret);
 656                 goto err_system;
 657         }
 658
 659         /* Move the data so it is external to the FIT, if requested */
 660         if (params->external_data) {
 661                 ret = fit_extract_data(params, tmpfile);
 662                 if (ret)
 663                         goto err_system;
 664         }
 665
 666         if (rename (tmpfile, params->imagefile) == -1) {
 667                 fprintf (stderr, "%s: Can't rename %s to %s: %s\n",
 668                                 params->cmdname, tmpfile, params->imagefile,
 669                                 strerror (errno));
 670                 unlink (tmpfile);
 671                 unlink (params->imagefile);
 672                 return EXIT_FAILURE;
 673         }
 674         return EXIT_SUCCESS;
 675
 676 err_system:
 677         unlink(tmpfile);
 678         return -1;
 679 }
 680
 681 /**
 682  * fit_image_extract - extract a FIT component image
 683  * @fit: pointer to the FIT format image header
 684  * @image_noffset: offset of the component image node
 685  * @file_name: name of the file to store the FIT sub-image
 686  *
 687  * returns:
 688  *     zero in case of success or a negative value if fail.
 689  */
 690 static int fit_image_extract(
 691         const void *fit,
 692         int image_noffset,
 693         const char *file_name)
 694 {
 695         const void *file_data;
 696         size_t file_size = 0;
 697
 698         /* get the "data" property of component at offset "image_noffset" */
 699         fit_image_get_data(fit, image_noffset, &file_data, &file_size);
 700
 701         /* save the "file_data" into the file specified by "file_name" */
 702         return imagetool_save_subimage(file_name, (ulong) file_data, file_size);
 703 }
 704
 705 /**
 706  * fit_extract_contents - retrieve a sub-image component from the FIT image
 707  * @ptr: pointer to the FIT format image header
 708  * @params: command line parameters
 709  *
 710  * returns:
 711  *     zero in case of success or a negative value if fail.
 712  */
 713 static int fit_extract_contents(void *ptr, struct image_tool_params *params)
 714 {
 715         int images_noffset;
 716         int noffset;
 717         int ndepth;
 718         const void *fit = ptr;
 719         int count = 0;
 720         const char *p;
 721
 722         /* Indent string is defined in header image.h */
 723         p = IMAGE_INDENT_STRING;
 724
 725         if (!fit_check_format(fit)) {
 726                 printf("Bad FIT image format\n");
 727                 return -1;
 728         }
 729
 730         /* Find images parent node offset */
 731         images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
 732         if (images_noffset < 0) {
 733                 printf("Can't find images parent node '%s' (%s)\n",
 734                        FIT_IMAGES_PATH, fdt_strerror(images_noffset));
 735                 return -1;
 736         }
 737
 738         /* Avoid any overrun */
 739         count = fit_get_subimage_count(fit, images_noffset);
 740         if ((params->pflag < 0) || (count <= params->pflag)) {
 741                 printf("No such component at '%d'\n", params->pflag);
 742                 return -1;
 743         }
 744
 745         /* Process its subnodes, extract the desired component from image */
 746         for (ndepth = 0, count = 0,
 747                 noffset = fdt_next_node(fit, images_noffset, &ndepth);
 748                 (noffset >= 0) && (ndepth > 0);
 749                 noffset = fdt_next_node(fit, noffset, &ndepth)) {
 750                 if (ndepth == 1) {
 751                         /*
 752                          * Direct child node of the images parent node,
 753                          * i.e. component image node.
 754                          */
 755                         if (params->pflag == count) {
 756                                 printf("Extracted:\n%s Image %u (%s)\n", p,
 757                                        count, fit_get_name(fit, noffset, NULL));
 758
 759                                 fit_image_print(fit, noffset, p);
 760
 761                                 return fit_image_extract(fit, noffset,
 762                                                 params->outfile);
 763                         }
 764
 765                         count++;
 766                 }
 767         }
 768
 769         return 0;
 770 }
 771
 772 static int fit_check_params(struct image_tool_params *params)
 773 {
 774         if (params->auto_its)
 775                 return 0;
 776         return  ((params->dflag && (params->fflag || params->lflag)) ||
 777                 (params->fflag && (params->dflag || params->lflag)) ||
 778                 (params->lflag && (params->dflag || params->fflag)));
 779 }
 780
 781 U_BOOT_IMAGE_TYPE(
 782         fitimage,
 783         "FIT Image support",
 784         sizeof(image_header_t),
 785         (void *)&header,
 786         fit_check_params,
 787         fit_verify_header,
 788         fit_print_contents,
 789         NULL,
 790         fit_extract_contents,
 791         fit_check_image_types,
 792         fit_handle_file,
 793         NULL /* FIT images use DTB header */
 794 );