xref: /openbmc/u-boot/tools/mkimage.c (revision aecd902a) 
1 /*
2  * (C) Copyright 2000-2004
3  * DENX Software Engineering
4  * Wolfgang Denk, wd@denx.de
5  * All rights reserved.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #ifndef __WIN32__
29 #include <netinet/in.h>		/* for host / network byte order conversions	*/
30 #endif
31 #include <sys/mman.h>
32 #include <sys/stat.h>
33 #include <time.h>
34 #include <unistd.h>
35 
36 #if defined(__BEOS__) || defined(__NetBSD__) || defined(__APPLE__)
37 #include <inttypes.h>
38 #endif
39 
40 #ifdef __WIN32__
41 typedef unsigned int __u32;
42 
43 #define SWAP_LONG(x) \
44 	((__u32)( \
45 		(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
46 		(((__u32)(x) & (__u32)0x0000ff00UL) <<  8) | \
47 		(((__u32)(x) & (__u32)0x00ff0000UL) >>  8) | \
48 		(((__u32)(x) & (__u32)0xff000000UL) >> 24) ))
49 typedef		unsigned char	uint8_t;
50 typedef		unsigned short	uint16_t;
51 typedef		unsigned int	uint32_t;
52 
53 #define     ntohl(a)	SWAP_LONG(a)
54 #define     htonl(a)	SWAP_LONG(a)
55 #endif	/* __WIN32__ */
56 
57 #ifndef	O_BINARY		/* should be define'd on __WIN32__ */
58 #define O_BINARY	0
59 #endif
60 
61 #include <image.h>
62 
63 extern int errno;
64 
65 #ifndef MAP_FAILED
66 #define MAP_FAILED (-1)
67 #endif
68 
69 char *cmdname;
70 
71 extern unsigned long crc32 (unsigned long crc, const char *buf, unsigned int len);
72 
73 typedef struct table_entry {
74 	int	val;		/* as defined in image.h	*/
75 	char	*sname;		/* short (input) name		*/
76 	char	*lname;		/* long (output) name		*/
77 } table_entry_t;
78 
79 table_entry_t arch_name[] = {
80     {	IH_CPU_INVALID,		NULL,		"Invalid CPU",	},
81     {	IH_CPU_ALPHA,		"alpha",	"Alpha",	},
82     {	IH_CPU_ARM,		"arm",		"ARM",		},
83     {	IH_CPU_I386,		"x86",		"Intel x86",	},
84     {	IH_CPU_IA64,		"ia64",		"IA64",		},
85     {	IH_CPU_M68K,		"m68k",		"MC68000",	},
86     {	IH_CPU_MICROBLAZE,	"microblaze",	"MicroBlaze",	},
87     {	IH_CPU_MIPS,		"mips",		"MIPS",		},
88     {	IH_CPU_MIPS64,		"mips64",	"MIPS 64 Bit",	},
89     {	IH_CPU_NIOS,		"nios",		"NIOS",		},
90     {	IH_CPU_NIOS2,		"nios2",	"NIOS II",	},
91     {	IH_CPU_PPC,		"ppc",		"PowerPC",	},
92     {	IH_CPU_S390,		"s390",		"IBM S390",	},
93     {	IH_CPU_SH,		"sh",		"SuperH",	},
94     {	IH_CPU_SPARC,		"sparc",	"SPARC",	},
95     {	IH_CPU_SPARC64,		"sparc64",	"SPARC 64 Bit",	},
96     {	-1,			"",		"",		},
97 };
98 
99 table_entry_t os_name[] = {
100     {	IH_OS_INVALID,	NULL,		"Invalid OS",		},
101     {	IH_OS_4_4BSD,	"4_4bsd",	"4_4BSD",		},
102     {	IH_OS_ARTOS,	"artos",	"ARTOS",		},
103     {	IH_OS_DELL,	"dell",		"Dell",			},
104     {	IH_OS_ESIX,	"esix",		"Esix",			},
105     {	IH_OS_FREEBSD,	"freebsd",	"FreeBSD",		},
106     {	IH_OS_IRIX,	"irix",		"Irix",			},
107     {	IH_OS_LINUX,	"linux",	"Linux",		},
108     {	IH_OS_LYNXOS,	"lynxos",	"LynxOS",		},
109     {	IH_OS_NCR,	"ncr",		"NCR",			},
110     {	IH_OS_NETBSD,	"netbsd",	"NetBSD",		},
111     {	IH_OS_OPENBSD,	"openbsd",	"OpenBSD",		},
112     {	IH_OS_PSOS,	"psos",		"pSOS",			},
113     {	IH_OS_QNX,	"qnx",		"QNX",			},
114     {	IH_OS_RTEMS,	"rtems",	"RTEMS",		},
115     {	IH_OS_SCO,	"sco",		"SCO",			},
116     {	IH_OS_SOLARIS,	"solaris",	"Solaris",		},
117     {	IH_OS_SVR4,	"svr4",		"SVR4",			},
118     {	IH_OS_U_BOOT,	"u-boot",	"U-Boot",		},
119     {	IH_OS_VXWORKS,	"vxworks",	"VxWorks",		},
120     {	-1,		"",		"",			},
121 };
122 
123 table_entry_t type_name[] = {
124     {	IH_TYPE_INVALID,    NULL,	  "Invalid Image",	},
125     {	IH_TYPE_FILESYSTEM, "filesystem", "Filesystem Image",	},
126     {	IH_TYPE_FIRMWARE,   "firmware",	  "Firmware",		},
127     {	IH_TYPE_KERNEL,	    "kernel",	  "Kernel Image",	},
128     {	IH_TYPE_MULTI,	    "multi",	  "Multi-File Image",	},
129     {	IH_TYPE_RAMDISK,    "ramdisk",	  "RAMDisk Image",	},
130     {	IH_TYPE_SCRIPT,     "script",	  "Script",		},
131     {	IH_TYPE_STANDALONE, "standalone", "Standalone Program", },
132     {	-1,		    "",		  "",			},
133 };
134 
135 table_entry_t comp_name[] = {
136     {	IH_COMP_NONE,	"none",		"uncompressed",		},
137     {	IH_COMP_BZIP2,	"bzip2",	"bzip2 compressed",	},
138     {	IH_COMP_GZIP,	"gzip",		"gzip compressed",	},
139     {	-1,		"",		"",			},
140 };
141 
142 static	void	copy_file (int, const char *, int);
143 static	void	usage	(void);
144 static	void	print_header (image_header_t *);
145 static	void	print_type (image_header_t *);
146 static	char	*put_table_entry (table_entry_t *, char *, int);
147 static	char	*put_arch (int);
148 static	char	*put_type (int);
149 static	char	*put_os   (int);
150 static	char	*put_comp (int);
151 static	int	get_table_entry (table_entry_t *, char *, char *);
152 static	int	get_arch(char *);
153 static	int	get_comp(char *);
154 static	int	get_os  (char *);
155 static	int	get_type(char *);
156 
157 
158 char	*datafile;
159 char	*imagefile;
160 
161 int dflag    = 0;
162 int eflag    = 0;
163 int lflag    = 0;
164 int vflag    = 0;
165 int xflag    = 0;
166 int opt_os   = IH_OS_LINUX;
167 int opt_arch = IH_CPU_PPC;
168 int opt_type = IH_TYPE_KERNEL;
169 int opt_comp = IH_COMP_GZIP;
170 
171 image_header_t header;
172 image_header_t *hdr = &header;
173 
174 int
175 main (int argc, char **argv)
176 {
177 	int ifd;
178 	uint32_t checksum;
179 	uint32_t addr;
180 	uint32_t ep;
181 	struct stat sbuf;
182 	unsigned char *ptr;
183 	char *name = "";
184 
185 	cmdname = *argv;
186 
187 	addr = ep = 0;
188 
189 	while (--argc > 0 && **++argv == '-') {
190 		while (*++*argv) {
191 			switch (**argv) {
192 			case 'l':
193 				lflag = 1;
194 				break;
195 			case 'A':
196 				if ((--argc <= 0) ||
197 				    (opt_arch = get_arch(*++argv)) < 0)
198 					usage ();
199 				goto NXTARG;
200 			case 'C':
201 				if ((--argc <= 0) ||
202 				    (opt_comp = get_comp(*++argv)) < 0)
203 					usage ();
204 				goto NXTARG;
205 			case 'O':
206 				if ((--argc <= 0) ||
207 				    (opt_os = get_os(*++argv)) < 0)
208 					usage ();
209 				goto NXTARG;
210 			case 'T':
211 				if ((--argc <= 0) ||
212 				    (opt_type = get_type(*++argv)) < 0)
213 					usage ();
214 				goto NXTARG;
215 
216 			case 'a':
217 				if (--argc <= 0)
218 					usage ();
219 				addr = strtoul (*++argv, (char **)&ptr, 16);
220 				if (*ptr) {
221 					fprintf (stderr,
222 						"%s: invalid load address %s\n",
223 						cmdname, *argv);
224 					exit (EXIT_FAILURE);
225 				}
226 				goto NXTARG;
227 			case 'd':
228 				if (--argc <= 0)
229 					usage ();
230 				datafile = *++argv;
231 				dflag = 1;
232 				goto NXTARG;
233 			case 'e':
234 				if (--argc <= 0)
235 					usage ();
236 				ep = strtoul (*++argv, (char **)&ptr, 16);
237 				if (*ptr) {
238 					fprintf (stderr,
239 						"%s: invalid entry point %s\n",
240 						cmdname, *argv);
241 					exit (EXIT_FAILURE);
242 				}
243 				eflag = 1;
244 				goto NXTARG;
245 			case 'n':
246 				if (--argc <= 0)
247 					usage ();
248 				name = *++argv;
249 				goto NXTARG;
250 			case 'v':
251 				vflag++;
252 				break;
253 			case 'x':
254 				xflag++;
255 				break;
256 			default:
257 				usage ();
258 			}
259 		}
260 NXTARG:		;
261 	}
262 
263 	if ((argc != 1) || ((lflag ^ dflag) == 0))
264 		usage();
265 
266 	if (!eflag) {
267 		ep = addr;
268 		/* If XIP, entry point must be after the U-Boot header */
269 		if (xflag)
270 			ep += sizeof(image_header_t);
271 	}
272 
273 	/*
274 	 * If XIP, ensure the entry point is equal to the load address plus
275 	 * the size of the U-Boot header.
276 	 */
277 	if (xflag) {
278 		if (ep != addr + sizeof(image_header_t)) {
279 			fprintf (stderr, "%s: For XIP, the entry point must be the load addr + %lu\n",
280 				cmdname,
281 				(unsigned long)sizeof(image_header_t));
282 			exit (EXIT_FAILURE);
283 		}
284 	}
285 
286 	imagefile = *argv;
287 
288 	if (lflag) {
289 		ifd = open(imagefile, O_RDONLY|O_BINARY);
290 	} else {
291 		ifd = open(imagefile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, 0666);
292 	}
293 
294 	if (ifd < 0) {
295 		fprintf (stderr, "%s: Can't open %s: %s\n",
296 			cmdname, imagefile, strerror(errno));
297 		exit (EXIT_FAILURE);
298 	}
299 
300 	if (lflag) {
301 		int len;
302 		char *data;
303 		/*
304 		 * list header information of existing image
305 		 */
306 		if (fstat(ifd, &sbuf) < 0) {
307 			fprintf (stderr, "%s: Can't stat %s: %s\n",
308 				cmdname, imagefile, strerror(errno));
309 			exit (EXIT_FAILURE);
310 		}
311 
312 		if ((unsigned)sbuf.st_size < sizeof(image_header_t)) {
313 			fprintf (stderr,
314 				"%s: Bad size: \"%s\" is no valid image\n",
315 				cmdname, imagefile);
316 			exit (EXIT_FAILURE);
317 		}
318 
319 		ptr = (unsigned char *)mmap(0, sbuf.st_size,
320 					    PROT_READ, MAP_SHARED, ifd, 0);
321 		if ((caddr_t)ptr == (caddr_t)-1) {
322 			fprintf (stderr, "%s: Can't read %s: %s\n",
323 				cmdname, imagefile, strerror(errno));
324 			exit (EXIT_FAILURE);
325 		}
326 
327 		/*
328 		 * create copy of header so that we can blank out the
329 		 * checksum field for checking - this can't be done
330 		 * on the PROT_READ mapped data.
331 		 */
332 		memcpy (hdr, ptr, sizeof(image_header_t));
333 
334 		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
335 			fprintf (stderr,
336 				"%s: Bad Magic Number: \"%s\" is no valid image\n",
337 				cmdname, imagefile);
338 			exit (EXIT_FAILURE);
339 		}
340 
341 		data = (char *)hdr;
342 		len  = sizeof(image_header_t);
343 
344 		checksum = ntohl(hdr->ih_hcrc);
345 		hdr->ih_hcrc = htonl(0);	/* clear for re-calculation */
346 
347 		if (crc32 (0, data, len) != checksum) {
348 			fprintf (stderr,
349 				"*** Warning: \"%s\" has bad header checksum!\n",
350 				imagefile);
351 		}
352 
353 		data = (char *)(ptr + sizeof(image_header_t));
354 		len  = sbuf.st_size - sizeof(image_header_t) ;
355 
356 		if (crc32 (0, data, len) != ntohl(hdr->ih_dcrc)) {
357 			fprintf (stderr,
358 				"*** Warning: \"%s\" has corrupted data!\n",
359 				imagefile);
360 		}
361 
362 		/* for multi-file images we need the data part, too */
363 		print_header ((image_header_t *)ptr);
364 
365 		(void) munmap((void *)ptr, sbuf.st_size);
366 		(void) close (ifd);
367 
368 		exit (EXIT_SUCCESS);
369 	}
370 
371 	/*
372 	 * Must be -w then:
373 	 *
374 	 * write dummy header, to be fixed later
375 	 */
376 	memset (hdr, 0, sizeof(image_header_t));
377 
378 	if (write(ifd, hdr, sizeof(image_header_t)) != sizeof(image_header_t)) {
379 		fprintf (stderr, "%s: Write error on %s: %s\n",
380 			cmdname, imagefile, strerror(errno));
381 		exit (EXIT_FAILURE);
382 	}
383 
384 	if (opt_type == IH_TYPE_MULTI || opt_type == IH_TYPE_SCRIPT) {
385 		char *file = datafile;
386 		unsigned long size;
387 
388 		for (;;) {
389 			char *sep = NULL;
390 
391 			if (file) {
392 				if ((sep = strchr(file, ':')) != NULL) {
393 					*sep = '\0';
394 				}
395 
396 				if (stat (file, &sbuf) < 0) {
397 					fprintf (stderr, "%s: Can't stat %s: %s\n",
398 						cmdname, file, strerror(errno));
399 					exit (EXIT_FAILURE);
400 				}
401 				size = htonl(sbuf.st_size);
402 			} else {
403 				size = 0;
404 			}
405 
406 			if (write(ifd, (char *)&size, sizeof(size)) != sizeof(size)) {
407 				fprintf (stderr, "%s: Write error on %s: %s\n",
408 					cmdname, imagefile, strerror(errno));
409 				exit (EXIT_FAILURE);
410 			}
411 
412 			if (!file) {
413 				break;
414 			}
415 
416 			if (sep) {
417 				*sep = ':';
418 				file = sep + 1;
419 			} else {
420 				file = NULL;
421 			}
422 		}
423 
424 		file = datafile;
425 
426 		for (;;) {
427 			char *sep = strchr(file, ':');
428 			if (sep) {
429 				*sep = '\0';
430 				copy_file (ifd, file, 1);
431 				*sep++ = ':';
432 				file = sep;
433 			} else {
434 				copy_file (ifd, file, 0);
435 				break;
436 			}
437 		}
438 	} else {
439 		copy_file (ifd, datafile, 0);
440 	}
441 
442 	/* We're a bit of paranoid */
443 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__) && !defined(__FreeBSD__)
444 	(void) fdatasync (ifd);
445 #else
446 	(void) fsync (ifd);
447 #endif
448 
449 	if (fstat(ifd, &sbuf) < 0) {
450 		fprintf (stderr, "%s: Can't stat %s: %s\n",
451 			cmdname, imagefile, strerror(errno));
452 		exit (EXIT_FAILURE);
453 	}
454 
455 	ptr = (unsigned char *)mmap(0, sbuf.st_size,
456 				    PROT_READ|PROT_WRITE, MAP_SHARED, ifd, 0);
457 	if (ptr == (unsigned char *)MAP_FAILED) {
458 		fprintf (stderr, "%s: Can't map %s: %s\n",
459 			cmdname, imagefile, strerror(errno));
460 		exit (EXIT_FAILURE);
461 	}
462 
463 	hdr = (image_header_t *)ptr;
464 
465 	checksum = crc32 (0,
466 			  (const char *)(ptr + sizeof(image_header_t)),
467 			  sbuf.st_size - sizeof(image_header_t)
468 			 );
469 
470 	/* Build new header */
471 	hdr->ih_magic = htonl(IH_MAGIC);
472 	hdr->ih_time  = htonl(sbuf.st_mtime);
473 	hdr->ih_size  = htonl(sbuf.st_size - sizeof(image_header_t));
474 	hdr->ih_load  = htonl(addr);
475 	hdr->ih_ep    = htonl(ep);
476 	hdr->ih_dcrc  = htonl(checksum);
477 	hdr->ih_os    = opt_os;
478 	hdr->ih_arch  = opt_arch;
479 	hdr->ih_type  = opt_type;
480 	hdr->ih_comp  = opt_comp;
481 
482 	strncpy((char *)hdr->ih_name, name, IH_NMLEN);
483 
484 	checksum = crc32(0,(const char *)hdr,sizeof(image_header_t));
485 
486 	hdr->ih_hcrc = htonl(checksum);
487 
488 	print_header (hdr);
489 
490 	(void) munmap((void *)ptr, sbuf.st_size);
491 
492 	/* We're a bit of paranoid */
493 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__) && !defined(__FreeBSD__)
494 	(void) fdatasync (ifd);
495 #else
496 	(void) fsync (ifd);
497 #endif
498 
499 	if (close(ifd)) {
500 		fprintf (stderr, "%s: Write error on %s: %s\n",
501 			cmdname, imagefile, strerror(errno));
502 		exit (EXIT_FAILURE);
503 	}
504 
505 	exit (EXIT_SUCCESS);
506 }
507 
508 static void
509 copy_file (int ifd, const char *datafile, int pad)
510 {
511 	int dfd;
512 	struct stat sbuf;
513 	unsigned char *ptr;
514 	int tail;
515 	int zero = 0;
516 	int offset = 0;
517 	int size;
518 
519 	if (vflag) {
520 		fprintf (stderr, "Adding Image %s\n", datafile);
521 	}
522 
523 	if ((dfd = open(datafile, O_RDONLY|O_BINARY)) < 0) {
524 		fprintf (stderr, "%s: Can't open %s: %s\n",
525 			cmdname, datafile, strerror(errno));
526 		exit (EXIT_FAILURE);
527 	}
528 
529 	if (fstat(dfd, &sbuf) < 0) {
530 		fprintf (stderr, "%s: Can't stat %s: %s\n",
531 			cmdname, datafile, strerror(errno));
532 		exit (EXIT_FAILURE);
533 	}
534 
535 	ptr = (unsigned char *)mmap(0, sbuf.st_size,
536 				    PROT_READ, MAP_SHARED, dfd, 0);
537 	if (ptr == (unsigned char *)MAP_FAILED) {
538 		fprintf (stderr, "%s: Can't read %s: %s\n",
539 			cmdname, datafile, strerror(errno));
540 		exit (EXIT_FAILURE);
541 	}
542 
543 	if (xflag) {
544 		unsigned char *p = NULL;
545 		/*
546 		 * XIP: do not append the image_header_t at the
547 		 * beginning of the file, but consume the space
548 		 * reserved for it.
549 		 */
550 
551 		if ((unsigned)sbuf.st_size < sizeof(image_header_t)) {
552 			fprintf (stderr,
553 				"%s: Bad size: \"%s\" is too small for XIP\n",
554 				cmdname, datafile);
555 			exit (EXIT_FAILURE);
556 		}
557 
558 		for (p=ptr; p < ptr+sizeof(image_header_t); p++) {
559 			if ( *p != 0xff ) {
560 				fprintf (stderr,
561 					"%s: Bad file: \"%s\" has invalid buffer for XIP\n",
562 					cmdname, datafile);
563 				exit (EXIT_FAILURE);
564 			}
565 		}
566 
567 		offset = sizeof(image_header_t);
568 	}
569 
570 	size = sbuf.st_size - offset;
571 	if (write(ifd, ptr + offset, size) != size) {
572 		fprintf (stderr, "%s: Write error on %s: %s\n",
573 			cmdname, imagefile, strerror(errno));
574 		exit (EXIT_FAILURE);
575 	}
576 
577 	if (pad && ((tail = size % 4) != 0)) {
578 
579 		if (write(ifd, (char *)&zero, 4-tail) != 4-tail) {
580 			fprintf (stderr, "%s: Write error on %s: %s\n",
581 				cmdname, imagefile, strerror(errno));
582 			exit (EXIT_FAILURE);
583 		}
584 	}
585 
586 	(void) munmap((void *)ptr, sbuf.st_size);
587 	(void) close (dfd);
588 }
589 
590 void
591 usage ()
592 {
593 	fprintf (stderr, "Usage: %s -l image\n"
594 			 "          -l ==> list image header information\n"
595 			 "       %s [-x] -A arch -O os -T type -C comp "
596 			 "-a addr -e ep -n name -d data_file[:data_file...] image\n",
597 		cmdname, cmdname);
598 	fprintf (stderr, "          -A ==> set architecture to 'arch'\n"
599 			 "          -O ==> set operating system to 'os'\n"
600 			 "          -T ==> set image type to 'type'\n"
601 			 "          -C ==> set compression type 'comp'\n"
602 			 "          -a ==> set load address to 'addr' (hex)\n"
603 			 "          -e ==> set entry point to 'ep' (hex)\n"
604 			 "          -n ==> set image name to 'name'\n"
605 			 "          -d ==> use image data from 'datafile'\n"
606 			 "          -x ==> set XIP (execute in place)\n"
607 		);
608 	exit (EXIT_FAILURE);
609 }
610 
611 static void
612 print_header (image_header_t *hdr)
613 {
614 	time_t timestamp;
615 	uint32_t size;
616 
617 	timestamp = (time_t)ntohl(hdr->ih_time);
618 	size = ntohl(hdr->ih_size);
619 
620 	printf ("Image Name:   %.*s\n", IH_NMLEN, hdr->ih_name);
621 	printf ("Created:      %s", ctime(&timestamp));
622 	printf ("Image Type:   "); print_type(hdr);
623 	printf ("Data Size:    %d Bytes = %.2f kB = %.2f MB\n",
624 		size, (double)size / 1.024e3, (double)size / 1.048576e6 );
625 	printf ("Load Address: 0x%08X\n", ntohl(hdr->ih_load));
626 	printf ("Entry Point:  0x%08X\n", ntohl(hdr->ih_ep));
627 
628 	if (hdr->ih_type == IH_TYPE_MULTI || hdr->ih_type == IH_TYPE_SCRIPT) {
629 		int i, ptrs;
630 		uint32_t pos;
631 		unsigned long *len_ptr = (unsigned long *) (
632 					(unsigned long)hdr + sizeof(image_header_t)
633 				);
634 
635 		/* determine number of images first (to calculate image offsets) */
636 		for (i=0; len_ptr[i]; ++i)	/* null pointer terminates list */
637 			;
638 		ptrs = i;		/* null pointer terminates list */
639 
640 		pos = sizeof(image_header_t) + ptrs * sizeof(long);
641 		printf ("Contents:\n");
642 		for (i=0; len_ptr[i]; ++i) {
643 			size = ntohl(len_ptr[i]);
644 
645 			printf ("   Image %d: %8d Bytes = %4d kB = %d MB\n",
646 				i, size, size>>10, size>>20);
647 			if (hdr->ih_type == IH_TYPE_SCRIPT && i > 0) {
648 				/*
649 				 * the user may need to know offsets
650 				 * if planning to do something with
651 				 * multiple files
652 				 */
653 				printf ("    Offset = %08X\n", pos);
654 			}
655 			/* copy_file() will pad the first files to even word align */
656 			size += 3;
657 			size &= ~3;
658 			pos += size;
659 		}
660 	}
661 }
662 
663 
664 static void
665 print_type (image_header_t *hdr)
666 {
667 	printf ("%s %s %s (%s)\n",
668 		put_arch (hdr->ih_arch),
669 		put_os   (hdr->ih_os  ),
670 		put_type (hdr->ih_type),
671 		put_comp (hdr->ih_comp)
672 	);
673 }
674 
675 static char *put_arch (int arch)
676 {
677 	return (put_table_entry(arch_name, "Unknown Architecture", arch));
678 }
679 
680 static char *put_os (int os)
681 {
682 	return (put_table_entry(os_name, "Unknown OS", os));
683 }
684 
685 static char *put_type (int type)
686 {
687 	return (put_table_entry(type_name, "Unknown Image", type));
688 }
689 
690 static char *put_comp (int comp)
691 {
692 	return (put_table_entry(comp_name, "Unknown Compression", comp));
693 }
694 
695 static char *put_table_entry (table_entry_t *table, char *msg, int type)
696 {
697 	for (; table->val>=0; ++table) {
698 		if (table->val == type)
699 			return (table->lname);
700 	}
701 	return (msg);
702 }
703 
704 static int get_arch(char *name)
705 {
706 	return (get_table_entry(arch_name, "CPU", name));
707 }
708 
709 
710 static int get_comp(char *name)
711 {
712 	return (get_table_entry(comp_name, "Compression", name));
713 }
714 
715 
716 static int get_os (char *name)
717 {
718 	return (get_table_entry(os_name, "OS", name));
719 }
720 
721 
722 static int get_type(char *name)
723 {
724 	return (get_table_entry(type_name, "Image", name));
725 }
726 
727 static int get_table_entry (table_entry_t *table, char *msg, char *name)
728 {
729 	table_entry_t *t;
730 	int first = 1;
731 
732 	for (t=table; t->val>=0; ++t) {
733 		if (t->sname && strcasecmp(t->sname, name)==0)
734 			return (t->val);
735 	}
736 	fprintf (stderr, "\nInvalid %s Type - valid names are", msg);
737 	for (t=table; t->val>=0; ++t) {
738 		if (t->sname == NULL)
739 			continue;
740 		fprintf (stderr, "%c %s", (first) ? ':' : ',', t->sname);
741 		first = 0;
742 	}
743 	fprintf (stderr, "\n");
744 	return (-1);
745 }
746