1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2008 Semihalf
4 *
5 * (C) Copyright 2000-2009
6 * DENX Software Engineering
7 * Wolfgang Denk, wd@denx.de
8 */
9
10 #include "imagetool.h"
11 #include "mkimage.h"
12 #include "imximage.h"
13 #include <image.h>
14 #include <version.h>
15
16 static void copy_file(int, const char *, int);
17
18 /* parameters initialized by core will be used by the image type code */
19 static struct image_tool_params params = {
20 .os = IH_OS_LINUX,
21 .arch = IH_ARCH_PPC,
22 .type = IH_TYPE_KERNEL,
23 .comp = IH_COMP_GZIP,
24 .dtc = MKIMAGE_DEFAULT_DTC_OPTIONS,
25 .imagename = "",
26 .imagename2 = "",
27 };
28
29 static enum ih_category cur_category;
30
h_compare_category_name(const void * vtype1,const void * vtype2)31 static int h_compare_category_name(const void *vtype1, const void *vtype2)
32 {
33 const int *type1 = vtype1;
34 const int *type2 = vtype2;
35 const char *name1 = genimg_get_cat_short_name(cur_category, *type1);
36 const char *name2 = genimg_get_cat_short_name(cur_category, *type2);
37
38 return strcmp(name1, name2);
39 }
40
show_valid_options(enum ih_category category)41 static int show_valid_options(enum ih_category category)
42 {
43 int *order;
44 int count;
45 int item;
46 int i;
47
48 count = genimg_get_cat_count(category);
49 order = calloc(count, sizeof(*order));
50 if (!order)
51 return -ENOMEM;
52
53 /* Sort the names in order of short name for easier reading */
54 for (i = 0, item = 0; i < count; i++, item++) {
55 while (!genimg_cat_has_id(category, item) && i < count) {
56 item++;
57 count--;
58 }
59 order[i] = item;
60 }
61 cur_category = category;
62 qsort(order, count, sizeof(int), h_compare_category_name);
63
64 fprintf(stderr, "\nInvalid %s, supported are:\n",
65 genimg_get_cat_desc(category));
66 for (i = 0; i < count; i++) {
67 item = order[i];
68 fprintf(stderr, "\t%-15s %s\n",
69 genimg_get_cat_short_name(category, item),
70 genimg_get_cat_name(category, item));
71 }
72 fprintf(stderr, "\n");
73 free(order);
74
75 return 0;
76 }
77
usage(const char * msg)78 static void usage(const char *msg)
79 {
80 fprintf(stderr, "Error: %s\n", msg);
81 fprintf(stderr, "Usage: %s -l image\n"
82 " -l ==> list image header information\n",
83 params.cmdname);
84 fprintf(stderr,
85 " %s [-x] -A arch -O os -T type -C comp -a addr -e ep -n name -d data_file[:data_file...] image\n"
86 " -A ==> set architecture to 'arch'\n"
87 " -O ==> set operating system to 'os'\n"
88 " -T ==> set image type to 'type'\n"
89 " -C ==> set compression type 'comp'\n"
90 " -a ==> set load address to 'addr' (hex)\n"
91 " -e ==> set entry point to 'ep' (hex)\n"
92 " -n ==> set image name to 'name'\n"
93 " -d ==> use image data from 'datafile'\n"
94 " -x ==> set XIP (execute in place)\n",
95 params.cmdname);
96 fprintf(stderr,
97 " %s [-D dtc_options] [-f fit-image.its|-f auto|-F] [-b <dtb> [-b <dtb>]] [-E] [-B size] [-i <ramdisk.cpio.gz>] fit-image\n"
98 " <dtb> file is used with -f auto, it may occur multiple times.\n",
99 params.cmdname);
100 fprintf(stderr,
101 " -D => set all options for device tree compiler\n"
102 " -f => input filename for FIT source\n"
103 " -i => input filename for ramdisk file\n"
104 " -E => place data outside of the FIT structure\n"
105 " -B => align size in hex for FIT structure and header\n");
106 #ifdef CONFIG_FIT_SIGNATURE
107 fprintf(stderr,
108 "Signing / verified boot options: [-k keydir] [-K dtb] [ -c <comment>] [-p addr] [-r] [-N engine]\n"
109 " -k => set directory containing private keys\n"
110 " -K => write public keys to this .dtb file\n"
111 " -G => use this signing key (in lieu of -k)\n"
112 " -c => add comment in signature node\n"
113 " -F => re-sign existing FIT image\n"
114 " -p => place external data at a static position\n"
115 " -r => mark keys used as 'required' in dtb\n"
116 " -N => openssl engine to use for signing\n");
117 #else
118 fprintf(stderr,
119 "Signing / verified boot not supported (CONFIG_FIT_SIGNATURE undefined)\n");
120 #endif
121 fprintf(stderr, " %s -V ==> print version information and exit\n",
122 params.cmdname);
123 fprintf(stderr, "Use '-T list' to see a list of available image types\n");
124
125 exit(EXIT_FAILURE);
126 }
127
add_content(int type,const char * fname)128 static int add_content(int type, const char *fname)
129 {
130 struct content_info *cont;
131
132 cont = calloc(1, sizeof(*cont));
133 if (!cont)
134 return -1;
135 cont->type = type;
136 cont->fname = fname;
137 if (params.content_tail)
138 params.content_tail->next = cont;
139 else
140 params.content_head = cont;
141 params.content_tail = cont;
142
143 return 0;
144 }
145
146 #define OPT_STRING "a:A:b:B:c:C:d:D:e:Ef:Fk:i:K:ln:N:p:O:rR:qstT:vVx"
process_args(int argc,char ** argv)147 static void process_args(int argc, char **argv)
148 {
149 char *ptr;
150 int type = IH_TYPE_INVALID;
151 char *datafile = NULL;
152 int opt;
153
154 while ((opt = getopt(argc, argv,
155 "a:A:b:B:c:C:d:D:e:Ef:FG:k:i:K:ln:N:p:O:rR:qstT:vVx")) != -1) {
156 switch (opt) {
157 case 'a':
158 params.addr = strtoull(optarg, &ptr, 16);
159 if (*ptr) {
160 fprintf(stderr, "%s: invalid load address %s\n",
161 params.cmdname, optarg);
162 exit(EXIT_FAILURE);
163 }
164 break;
165 case 'A':
166 params.arch = genimg_get_arch_id(optarg);
167 if (params.arch < 0) {
168 show_valid_options(IH_ARCH);
169 usage("Invalid architecture");
170 }
171 break;
172 case 'b':
173 if (add_content(IH_TYPE_FLATDT, optarg)) {
174 fprintf(stderr,
175 "%s: Out of memory adding content '%s'",
176 params.cmdname, optarg);
177 exit(EXIT_FAILURE);
178 }
179 break;
180 case 'B':
181 params.bl_len = strtoull(optarg, &ptr, 16);
182 if (*ptr) {
183 fprintf(stderr, "%s: invalid block length %s\n",
184 params.cmdname, optarg);
185 exit(EXIT_FAILURE);
186 }
187
188 break;
189 case 'c':
190 params.comment = optarg;
191 break;
192 case 'C':
193 params.comp = genimg_get_comp_id(optarg);
194 if (params.comp < 0) {
195 show_valid_options(IH_COMP);
196 usage("Invalid compression type");
197 }
198 break;
199 case 'd':
200 params.datafile = optarg;
201 params.dflag = 1;
202 break;
203 case 'D':
204 params.dtc = optarg;
205 break;
206 case 'e':
207 params.ep = strtoull(optarg, &ptr, 16);
208 if (*ptr) {
209 fprintf(stderr, "%s: invalid entry point %s\n",
210 params.cmdname, optarg);
211 exit(EXIT_FAILURE);
212 }
213 params.eflag = 1;
214 break;
215 case 'E':
216 params.external_data = true;
217 break;
218 case 'f':
219 datafile = optarg;
220 params.auto_its = !strcmp(datafile, "auto");
221 /* fallthrough */
222 case 'F':
223 /*
224 * The flattened image tree (FIT) format
225 * requires a flattened device tree image type
226 */
227 params.type = IH_TYPE_FLATDT;
228 params.fflag = 1;
229 break;
230 case 'G':
231 params.keyfile = optarg;
232 break;
233 case 'i':
234 params.fit_ramdisk = optarg;
235 break;
236 case 'k':
237 params.keydir = optarg;
238 break;
239 case 'K':
240 params.keydest = optarg;
241 break;
242 case 'l':
243 params.lflag = 1;
244 break;
245 case 'n':
246 params.imagename = optarg;
247 break;
248 case 'N':
249 params.engine_id = optarg;
250 break;
251 case 'O':
252 params.os = genimg_get_os_id(optarg);
253 if (params.os < 0) {
254 show_valid_options(IH_OS);
255 usage("Invalid operating system");
256 }
257 break;
258 case 'p':
259 params.external_offset = strtoull(optarg, &ptr, 16);
260 if (*ptr) {
261 fprintf(stderr, "%s: invalid offset size %s\n",
262 params.cmdname, optarg);
263 exit(EXIT_FAILURE);
264 }
265 break;
266 case 'q':
267 params.quiet = 1;
268 break;
269 case 'r':
270 params.require_keys = 1;
271 break;
272 case 'R':
273 /*
274 * This entry is for the second configuration
275 * file, if only one is not enough.
276 */
277 params.imagename2 = optarg;
278 break;
279 case 's':
280 params.skipcpy = 1;
281 break;
282 case 't':
283 params.reset_timestamp = 1;
284 break;
285 case 'T':
286 if (strcmp(optarg, "list") == 0) {
287 show_valid_options(IH_TYPE);
288 exit(EXIT_SUCCESS);
289 }
290 type = genimg_get_type_id(optarg);
291 if (type < 0) {
292 show_valid_options(IH_TYPE);
293 usage("Invalid image type");
294 }
295 break;
296 case 'v':
297 params.vflag++;
298 break;
299 case 'V':
300 printf("mkimage version %s\n", PLAIN_VERSION);
301 exit(EXIT_SUCCESS);
302 case 'x':
303 params.xflag++;
304 break;
305 default:
306 usage("Invalid option");
307 }
308 }
309
310 /* The last parameter is expected to be the imagefile */
311 if (optind < argc)
312 params.imagefile = argv[optind];
313
314 /*
315 * For auto-generated FIT images we need to know the image type to put
316 * in the FIT, which is separate from the file's image type (which
317 * will always be IH_TYPE_FLATDT in this case).
318 */
319 if (params.type == IH_TYPE_FLATDT) {
320 params.fit_image_type = type ? type : IH_TYPE_KERNEL;
321 /* For auto_its, datafile is always 'auto' */
322 if (!params.auto_its)
323 params.datafile = datafile;
324 else if (!params.datafile)
325 usage("Missing data file for auto-FIT (use -d)");
326 } else if (type != IH_TYPE_INVALID) {
327 if (type == IH_TYPE_SCRIPT && !params.datafile)
328 usage("Missing data file for script (use -d)");
329 params.type = type;
330 }
331
332 if (!params.imagefile)
333 usage("Missing output filename");
334 }
335
main(int argc,char ** argv)336 int main(int argc, char **argv)
337 {
338 int ifd = -1;
339 struct stat sbuf;
340 char *ptr;
341 int retval = 0;
342 struct image_type_params *tparams = NULL;
343 int pad_len = 0;
344 int dfd;
345 size_t map_len;
346
347 params.cmdname = *argv;
348 params.addr = 0;
349 params.ep = 0;
350
351 process_args(argc, argv);
352
353 /* set tparams as per input type_id */
354 tparams = imagetool_get_type(params.type);
355 if (tparams == NULL) {
356 fprintf (stderr, "%s: unsupported type %s\n",
357 params.cmdname, genimg_get_type_name(params.type));
358 exit (EXIT_FAILURE);
359 }
360
361 /*
362 * check the passed arguments parameters meets the requirements
363 * as per image type to be generated/listed
364 */
365 if (tparams->check_params)
366 if (tparams->check_params (¶ms))
367 usage("Bad parameters for image type");
368
369 if (!params.eflag) {
370 params.ep = params.addr;
371 /* If XIP, entry point must be after the U-Boot header */
372 if (params.xflag)
373 params.ep += tparams->header_size;
374 }
375
376 if (params.fflag){
377 if (tparams->fflag_handle)
378 /*
379 * in some cases, some additional processing needs
380 * to be done if fflag is defined
381 *
382 * For ex. fit_handle_file for Fit file support
383 */
384 retval = tparams->fflag_handle(¶ms);
385
386 if (retval != EXIT_SUCCESS)
387 exit (retval);
388 }
389
390 if (params.lflag || params.fflag) {
391 ifd = open (params.imagefile, O_RDONLY|O_BINARY);
392 } else {
393 ifd = open (params.imagefile,
394 O_RDWR|O_CREAT|O_TRUNC|O_BINARY, 0666);
395 }
396
397 if (ifd < 0) {
398 fprintf (stderr, "%s: Can't open %s: %s\n",
399 params.cmdname, params.imagefile,
400 strerror(errno));
401 exit (EXIT_FAILURE);
402 }
403
404 if (params.lflag || params.fflag) {
405 /*
406 * list header information of existing image
407 */
408 if (fstat(ifd, &sbuf) < 0) {
409 fprintf (stderr, "%s: Can't stat %s: %s\n",
410 params.cmdname, params.imagefile,
411 strerror(errno));
412 exit (EXIT_FAILURE);
413 }
414
415 if ((unsigned)sbuf.st_size < tparams->header_size) {
416 fprintf (stderr,
417 "%s: Bad size: \"%s\" is not valid image\n",
418 params.cmdname, params.imagefile);
419 exit (EXIT_FAILURE);
420 }
421
422 ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, ifd, 0);
423 if (ptr == MAP_FAILED) {
424 fprintf (stderr, "%s: Can't read %s: %s\n",
425 params.cmdname, params.imagefile,
426 strerror(errno));
427 exit (EXIT_FAILURE);
428 }
429
430 if (params.fflag) {
431 /*
432 * Verifies the header format based on the expected header for image
433 * type in tparams
434 */
435 retval = imagetool_verify_print_header_by_type(ptr, &sbuf,
436 tparams, ¶ms);
437 } else {
438 /**
439 * When listing the image, we are not given the image type. Simply check all
440 * image types to find one that matches our header
441 */
442 retval = imagetool_verify_print_header(ptr, &sbuf,
443 tparams, ¶ms);
444 }
445
446 (void) munmap((void *)ptr, sbuf.st_size);
447 (void) close (ifd);
448
449 exit (retval);
450 }
451
452 if ((params.type != IH_TYPE_MULTI) && (params.type != IH_TYPE_SCRIPT)) {
453 dfd = open(params.datafile, O_RDONLY | O_BINARY);
454 if (dfd < 0) {
455 fprintf(stderr, "%s: Can't open %s: %s\n",
456 params.cmdname, params.datafile,
457 strerror(errno));
458 exit(EXIT_FAILURE);
459 }
460
461 if (fstat(dfd, &sbuf) < 0) {
462 fprintf(stderr, "%s: Can't stat %s: %s\n",
463 params.cmdname, params.datafile,
464 strerror(errno));
465 exit(EXIT_FAILURE);
466 }
467
468 params.file_size = sbuf.st_size + tparams->header_size;
469 close(dfd);
470 }
471
472 /*
473 * In case there an header with a variable
474 * length will be added, the corresponding
475 * function is called. This is responsible to
476 * allocate memory for the header itself.
477 */
478 if (tparams->vrec_header)
479 pad_len = tparams->vrec_header(¶ms, tparams);
480 else
481 memset(tparams->hdr, 0, tparams->header_size);
482
483 if (write(ifd, tparams->hdr, tparams->header_size)
484 != tparams->header_size) {
485 fprintf (stderr, "%s: Write error on %s: %s\n",
486 params.cmdname, params.imagefile, strerror(errno));
487 exit (EXIT_FAILURE);
488 }
489
490 if (!params.skipcpy) {
491 if (params.type == IH_TYPE_MULTI ||
492 params.type == IH_TYPE_SCRIPT) {
493 char *file = params.datafile;
494 uint32_t size;
495
496 for (;;) {
497 char *sep = NULL;
498
499 if (file) {
500 if ((sep = strchr(file, ':')) != NULL) {
501 *sep = '\0';
502 }
503
504 if (stat (file, &sbuf) < 0) {
505 fprintf (stderr, "%s: Can't stat %s: %s\n",
506 params.cmdname, file, strerror(errno));
507 exit (EXIT_FAILURE);
508 }
509 size = cpu_to_uimage (sbuf.st_size);
510 } else {
511 size = 0;
512 }
513
514 if (write(ifd, (char *)&size, sizeof(size)) != sizeof(size)) {
515 fprintf (stderr, "%s: Write error on %s: %s\n",
516 params.cmdname, params.imagefile,
517 strerror(errno));
518 exit (EXIT_FAILURE);
519 }
520
521 if (!file) {
522 break;
523 }
524
525 if (sep) {
526 *sep = ':';
527 file = sep + 1;
528 } else {
529 file = NULL;
530 }
531 }
532
533 file = params.datafile;
534
535 for (;;) {
536 char *sep = strchr(file, ':');
537 if (sep) {
538 *sep = '\0';
539 copy_file (ifd, file, 1);
540 *sep++ = ':';
541 file = sep;
542 } else {
543 copy_file (ifd, file, 0);
544 break;
545 }
546 }
547 } else if (params.type == IH_TYPE_PBLIMAGE) {
548 /* PBL has special Image format, implements its' own */
549 pbl_load_uboot(ifd, ¶ms);
550 } else if (params.type == IH_TYPE_ZYNQMPBIF) {
551 /* Image file is meta, walk through actual targets */
552 int ret;
553
554 ret = zynqmpbif_copy_image(ifd, ¶ms);
555 if (ret)
556 return ret;
557 } else if (params.type == IH_TYPE_IMX8IMAGE) {
558 /* i.MX8/8X has special Image format */
559 int ret;
560
561 ret = imx8image_copy_image(ifd, ¶ms);
562 if (ret)
563 return ret;
564 } else if (params.type == IH_TYPE_IMX8MIMAGE) {
565 /* i.MX8M has special Image format */
566 int ret;
567
568 ret = imx8mimage_copy_image(ifd, ¶ms);
569 if (ret)
570 return ret;
571 } else if ((params.type == IH_TYPE_RKSD) ||
572 (params.type == IH_TYPE_RKSPI)) {
573 /* Rockchip has special Image format */
574 int ret;
575
576 ret = rockchip_copy_image(ifd, ¶ms);
577 if (ret)
578 return ret;
579 } else {
580 copy_file(ifd, params.datafile, pad_len);
581 }
582 if (params.type == IH_TYPE_FIRMWARE_IVT) {
583 /* Add alignment and IVT */
584 uint32_t aligned_filesize = ALIGN(params.file_size,
585 0x1000);
586 flash_header_v2_t ivt_header = { { 0xd1, 0x2000, 0x40 },
587 params.addr, 0, 0, 0, params.addr
588 + aligned_filesize
589 - tparams->header_size,
590 params.addr + aligned_filesize
591 - tparams->header_size
592 + 0x20, 0 };
593 int i = params.file_size;
594 for (; i < aligned_filesize; i++) {
595 if (write(ifd, (char *) &i, 1) != 1) {
596 fprintf(stderr,
597 "%s: Write error on %s: %s\n",
598 params.cmdname,
599 params.imagefile,
600 strerror(errno));
601 exit(EXIT_FAILURE);
602 }
603 }
604 if (write(ifd, &ivt_header, sizeof(flash_header_v2_t))
605 != sizeof(flash_header_v2_t)) {
606 fprintf(stderr, "%s: Write error on %s: %s\n",
607 params.cmdname,
608 params.imagefile,
609 strerror(errno));
610 exit(EXIT_FAILURE);
611 }
612 }
613 }
614
615 /* We're a bit of paranoid */
616 #if defined(_POSIX_SYNCHRONIZED_IO) && \
617 !defined(__sun__) && \
618 !defined(__FreeBSD__) && \
619 !defined(__OpenBSD__) && \
620 !defined(__APPLE__)
621 (void) fsync (ifd);
622 #else
623 (void) fsync (ifd);
624 #endif
625
626 if (fstat(ifd, &sbuf) < 0) {
627 fprintf (stderr, "%s: Can't stat %s: %s\n",
628 params.cmdname, params.imagefile, strerror(errno));
629 exit (EXIT_FAILURE);
630 }
631 params.file_size = sbuf.st_size;
632
633 map_len = sbuf.st_size;
634 ptr = mmap(0, map_len, PROT_READ | PROT_WRITE, MAP_SHARED, ifd, 0);
635 if (ptr == MAP_FAILED) {
636 fprintf (stderr, "%s: Can't map %s: %s\n",
637 params.cmdname, params.imagefile, strerror(errno));
638 exit (EXIT_FAILURE);
639 }
640
641 /* Setup the image header as per input image type*/
642 if (tparams->set_header)
643 tparams->set_header (ptr, &sbuf, ifd, ¶ms);
644 else {
645 fprintf (stderr, "%s: Can't set header for %s: %s\n",
646 params.cmdname, tparams->name, strerror(errno));
647 exit (EXIT_FAILURE);
648 }
649
650 /* Print the image information by processing image header */
651 if (tparams->print_header)
652 tparams->print_header (ptr);
653 else {
654 fprintf (stderr, "%s: Can't print header for %s\n",
655 params.cmdname, tparams->name);
656 }
657
658 (void)munmap((void *)ptr, map_len);
659
660 /* We're a bit of paranoid */
661 #if defined(_POSIX_SYNCHRONIZED_IO) && \
662 !defined(__sun__) && \
663 !defined(__FreeBSD__) && \
664 !defined(__OpenBSD__) && \
665 !defined(__APPLE__)
666 (void) fsync (ifd);
667 #else
668 (void) fsync (ifd);
669 #endif
670
671 if (close(ifd)) {
672 fprintf (stderr, "%s: Write error on %s: %s\n",
673 params.cmdname, params.imagefile, strerror(errno));
674 exit (EXIT_FAILURE);
675 }
676
677 exit (EXIT_SUCCESS);
678 }
679
680 static void
copy_file(int ifd,const char * datafile,int pad)681 copy_file (int ifd, const char *datafile, int pad)
682 {
683 int dfd;
684 struct stat sbuf;
685 unsigned char *ptr;
686 int tail;
687 int zero = 0;
688 uint8_t zeros[4096];
689 int offset = 0;
690 int size, ret;
691 struct image_type_params *tparams = imagetool_get_type(params.type);
692
693 memset(zeros, 0, sizeof(zeros));
694
695 if (params.vflag) {
696 fprintf (stderr, "Adding Image %s\n", datafile);
697 }
698
699 if ((dfd = open(datafile, O_RDONLY|O_BINARY)) < 0) {
700 fprintf (stderr, "%s: Can't open %s: %s\n",
701 params.cmdname, datafile, strerror(errno));
702 exit (EXIT_FAILURE);
703 }
704
705 if (fstat(dfd, &sbuf) < 0) {
706 fprintf (stderr, "%s: Can't stat %s: %s\n",
707 params.cmdname, datafile, strerror(errno));
708 exit (EXIT_FAILURE);
709 }
710
711 ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, dfd, 0);
712 if (ptr == MAP_FAILED) {
713 fprintf (stderr, "%s: Can't read %s: %s\n",
714 params.cmdname, datafile, strerror(errno));
715 exit (EXIT_FAILURE);
716 }
717
718 if (params.xflag) {
719 unsigned char *p = NULL;
720 /*
721 * XIP: do not append the image_header_t at the
722 * beginning of the file, but consume the space
723 * reserved for it.
724 */
725
726 if ((unsigned)sbuf.st_size < tparams->header_size) {
727 fprintf (stderr,
728 "%s: Bad size: \"%s\" is too small for XIP\n",
729 params.cmdname, datafile);
730 exit (EXIT_FAILURE);
731 }
732
733 for (p = ptr; p < ptr + tparams->header_size; p++) {
734 if ( *p != 0xff ) {
735 fprintf (stderr,
736 "%s: Bad file: \"%s\" has invalid buffer for XIP\n",
737 params.cmdname, datafile);
738 exit (EXIT_FAILURE);
739 }
740 }
741
742 offset = tparams->header_size;
743 }
744
745 size = sbuf.st_size - offset;
746
747 ret = write(ifd, ptr + offset, size);
748 if (ret != size) {
749 if (ret < 0)
750 fprintf (stderr, "%s: Write error on %s: %s\n",
751 params.cmdname, params.imagefile, strerror(errno));
752 else if (ret < size)
753 fprintf (stderr, "%s: Write only %d/%d bytes, "\
754 "probably no space left on the device\n",
755 params.cmdname, ret, size);
756 exit (EXIT_FAILURE);
757 }
758
759 tail = size % 4;
760 if ((pad == 1) && (tail != 0)) {
761
762 if (write(ifd, (char *)&zero, 4-tail) != 4-tail) {
763 fprintf (stderr, "%s: Write error on %s: %s\n",
764 params.cmdname, params.imagefile,
765 strerror(errno));
766 exit (EXIT_FAILURE);
767 }
768 } else if (pad > 1) {
769 while (pad > 0) {
770 int todo = sizeof(zeros);
771
772 if (todo > pad)
773 todo = pad;
774 if (write(ifd, (char *)&zeros, todo) != todo) {
775 fprintf(stderr, "%s: Write error on %s: %s\n",
776 params.cmdname, params.imagefile,
777 strerror(errno));
778 exit(EXIT_FAILURE);
779 }
780 pad -= todo;
781 }
782 }
783
784 (void) munmap((void *)ptr, sbuf.st_size);
785 (void) close (dfd);
786 }
787