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