xref: /openbmc/u-boot/tools/mkimage.c (revision 4c15ef55) 
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     {	IH_CPU_BLACKFIN,	"blackfin",	"Blackfin",	},
97     {	-1,			"",		"",		},
98 };
99 
100 table_entry_t os_name[] = {
101     {	IH_OS_INVALID,	NULL,		"Invalid OS",		},
102     {	IH_OS_4_4BSD,	"4_4bsd",	"4_4BSD",		},
103     {	IH_OS_ARTOS,	"artos",	"ARTOS",		},
104     {	IH_OS_DELL,	"dell",		"Dell",			},
105     {	IH_OS_ESIX,	"esix",		"Esix",			},
106     {	IH_OS_FREEBSD,	"freebsd",	"FreeBSD",		},
107     {	IH_OS_IRIX,	"irix",		"Irix",			},
108     {	IH_OS_LINUX,	"linux",	"Linux",		},
109     {	IH_OS_LYNXOS,	"lynxos",	"LynxOS",		},
110     {	IH_OS_NCR,	"ncr",		"NCR",			},
111     {	IH_OS_NETBSD,	"netbsd",	"NetBSD",		},
112     {	IH_OS_OPENBSD,	"openbsd",	"OpenBSD",		},
113     {	IH_OS_PSOS,	"psos",		"pSOS",			},
114     {	IH_OS_QNX,	"qnx",		"QNX",			},
115     {	IH_OS_RTEMS,	"rtems",	"RTEMS",		},
116     {	IH_OS_SCO,	"sco",		"SCO",			},
117     {	IH_OS_SOLARIS,	"solaris",	"Solaris",		},
118     {	IH_OS_SVR4,	"svr4",		"SVR4",			},
119     {	IH_OS_U_BOOT,	"u-boot",	"U-Boot",		},
120     {	IH_OS_VXWORKS,	"vxworks",	"VxWorks",		},
121     {	-1,		"",		"",			},
122 };
123 
124 table_entry_t type_name[] = {
125     {	IH_TYPE_INVALID,    NULL,	  "Invalid Image",	},
126     {	IH_TYPE_FILESYSTEM, "filesystem", "Filesystem Image",	},
127     {	IH_TYPE_FIRMWARE,   "firmware",	  "Firmware",		},
128     {	IH_TYPE_KERNEL,	    "kernel",	  "Kernel Image",	},
129     {	IH_TYPE_MULTI,	    "multi",	  "Multi-File Image",	},
130     {	IH_TYPE_RAMDISK,    "ramdisk",	  "RAMDisk Image",	},
131     {	IH_TYPE_SCRIPT,     "script",	  "Script",		},
132     {	IH_TYPE_STANDALONE, "standalone", "Standalone Program", },
133     {	-1,		    "",		  "",			},
134 };
135 
136 table_entry_t comp_name[] = {
137     {	IH_COMP_NONE,	"none",		"uncompressed",		},
138     {	IH_COMP_BZIP2,	"bzip2",	"bzip2 compressed",	},
139     {	IH_COMP_GZIP,	"gzip",		"gzip compressed",	},
140     {	-1,		"",		"",			},
141 };
142 
143 static	void	copy_file (int, const char *, int);
144 static	void	usage	(void);
145 static	void	print_header (image_header_t *);
146 static	void	print_type (image_header_t *);
147 static	char	*put_table_entry (table_entry_t *, char *, int);
148 static	char	*put_arch (int);
149 static	char	*put_type (int);
150 static	char	*put_os   (int);
151 static	char	*put_comp (int);
152 static	int	get_table_entry (table_entry_t *, char *, char *);
153 static	int	get_arch(char *);
154 static	int	get_comp(char *);
155 static	int	get_os  (char *);
156 static	int	get_type(char *);
157 
158 
159 char	*datafile;
160 char	*imagefile;
161 
162 int dflag    = 0;
163 int eflag    = 0;
164 int lflag    = 0;
165 int vflag    = 0;
166 int xflag    = 0;
167 int opt_os   = IH_OS_LINUX;
168 int opt_arch = IH_CPU_PPC;
169 int opt_type = IH_TYPE_KERNEL;
170 int opt_comp = IH_COMP_GZIP;
171 
172 image_header_t header;
173 image_header_t *hdr = &header;
174 
175 int
176 main (int argc, char **argv)
177 {
178 	int ifd;
179 	uint32_t checksum;
180 	uint32_t addr;
181 	uint32_t ep;
182 	struct stat sbuf;
183 	unsigned char *ptr;
184 	char *name = "";
185 
186 	cmdname = *argv;
187 
188 	addr = ep = 0;
189 
190 	while (--argc > 0 && **++argv == '-') {
191 		while (*++*argv) {
192 			switch (**argv) {
193 			case 'l':
194 				lflag = 1;
195 				break;
196 			case 'A':
197 				if ((--argc <= 0) ||
198 				    (opt_arch = get_arch(*++argv)) < 0)
199 					usage ();
200 				goto NXTARG;
201 			case 'C':
202 				if ((--argc <= 0) ||
203 				    (opt_comp = get_comp(*++argv)) < 0)
204 					usage ();
205 				goto NXTARG;
206 			case 'O':
207 				if ((--argc <= 0) ||
208 				    (opt_os = get_os(*++argv)) < 0)
209 					usage ();
210 				goto NXTARG;
211 			case 'T':
212 				if ((--argc <= 0) ||
213 				    (opt_type = get_type(*++argv)) < 0)
214 					usage ();
215 				goto NXTARG;
216 
217 			case 'a':
218 				if (--argc <= 0)
219 					usage ();
220 				addr = strtoul (*++argv, (char **)&ptr, 16);
221 				if (*ptr) {
222 					fprintf (stderr,
223 						"%s: invalid load address %s\n",
224 						cmdname, *argv);
225 					exit (EXIT_FAILURE);
226 				}
227 				goto NXTARG;
228 			case 'd':
229 				if (--argc <= 0)
230 					usage ();
231 				datafile = *++argv;
232 				dflag = 1;
233 				goto NXTARG;
234 			case 'e':
235 				if (--argc <= 0)
236 					usage ();
237 				ep = strtoul (*++argv, (char **)&ptr, 16);
238 				if (*ptr) {
239 					fprintf (stderr,
240 						"%s: invalid entry point %s\n",
241 						cmdname, *argv);
242 					exit (EXIT_FAILURE);
243 				}
244 				eflag = 1;
245 				goto NXTARG;
246 			case 'n':
247 				if (--argc <= 0)
248 					usage ();
249 				name = *++argv;
250 				goto NXTARG;
251 			case 'v':
252 				vflag++;
253 				break;
254 			case 'x':
255 				xflag++;
256 				break;
257 			default:
258 				usage ();
259 			}
260 		}
261 NXTARG:		;
262 	}
263 
264 	if ((argc != 1) || ((lflag ^ dflag) == 0))
265 		usage();
266 
267 	if (!eflag) {
268 		ep = addr;
269 		/* If XIP, entry point must be after the U-Boot header */
270 		if (xflag)
271 			ep += sizeof(image_header_t);
272 	}
273 
274 	/*
275 	 * If XIP, ensure the entry point is equal to the load address plus
276 	 * the size of the U-Boot header.
277 	 */
278 	if (xflag) {
279 		if (ep != addr + sizeof(image_header_t)) {
280 			fprintf (stderr,
281 				"%s: For XIP, the entry point must be the load addr + %lu\n",
282 				cmdname,
283 				(unsigned long)sizeof(image_header_t));
284 			exit (EXIT_FAILURE);
285 		}
286 	}
287 
288 	imagefile = *argv;
289 
290 	if (lflag) {
291 		ifd = open(imagefile, O_RDONLY|O_BINARY);
292 	} else {
293 		ifd = open(imagefile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, 0666);
294 	}
295 
296 	if (ifd < 0) {
297 		fprintf (stderr, "%s: Can't open %s: %s\n",
298 			cmdname, imagefile, strerror(errno));
299 		exit (EXIT_FAILURE);
300 	}
301 
302 	if (lflag) {
303 		int len;
304 		char *data;
305 		/*
306 		 * list header information of existing image
307 		 */
308 		if (fstat(ifd, &sbuf) < 0) {
309 			fprintf (stderr, "%s: Can't stat %s: %s\n",
310 				cmdname, imagefile, strerror(errno));
311 			exit (EXIT_FAILURE);
312 		}
313 
314 		if ((unsigned)sbuf.st_size < sizeof(image_header_t)) {
315 			fprintf (stderr,
316 				"%s: Bad size: \"%s\" is no valid image\n",
317 				cmdname, imagefile);
318 			exit (EXIT_FAILURE);
319 		}
320 
321 		ptr = (unsigned char *)mmap(0, sbuf.st_size,
322 					    PROT_READ, MAP_SHARED, ifd, 0);
323 		if ((caddr_t)ptr == (caddr_t)-1) {
324 			fprintf (stderr, "%s: Can't read %s: %s\n",
325 				cmdname, imagefile, strerror(errno));
326 			exit (EXIT_FAILURE);
327 		}
328 
329 		/*
330 		 * create copy of header so that we can blank out the
331 		 * checksum field for checking - this can't be done
332 		 * on the PROT_READ mapped data.
333 		 */
334 		memcpy (hdr, ptr, sizeof(image_header_t));
335 
336 		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
337 			fprintf (stderr,
338 				"%s: Bad Magic Number: \"%s\" is no valid image\n",
339 				cmdname, imagefile);
340 			exit (EXIT_FAILURE);
341 		}
342 
343 		data = (char *)hdr;
344 		len  = sizeof(image_header_t);
345 
346 		checksum = ntohl(hdr->ih_hcrc);
347 		hdr->ih_hcrc = htonl(0);	/* clear for re-calculation */
348 
349 		if (crc32 (0, data, len) != checksum) {
350 			fprintf (stderr,
351 				"%s: ERROR: \"%s\" has bad header checksum!\n",
352 				cmdname, imagefile);
353 			exit (EXIT_FAILURE);
354 		}
355 
356 		data = (char *)(ptr + sizeof(image_header_t));
357 		len  = sbuf.st_size - sizeof(image_header_t) ;
358 
359 		if (crc32 (0, data, len) != ntohl(hdr->ih_dcrc)) {
360 			fprintf (stderr,
361 				"%s: ERROR: \"%s\" has corrupted data!\n",
362 				cmdname, imagefile);
363 			exit (EXIT_FAILURE);
364 		}
365 
366 		/* for multi-file images we need the data part, too */
367 		print_header ((image_header_t *)ptr);
368 
369 		(void) munmap((void *)ptr, sbuf.st_size);
370 		(void) close (ifd);
371 
372 		exit (EXIT_SUCCESS);
373 	}
374 
375 	/*
376 	 * Must be -w then:
377 	 *
378 	 * write dummy header, to be fixed later
379 	 */
380 	memset (hdr, 0, sizeof(image_header_t));
381 
382 	if (write(ifd, hdr, sizeof(image_header_t)) != sizeof(image_header_t)) {
383 		fprintf (stderr, "%s: Write error on %s: %s\n",
384 			cmdname, imagefile, strerror(errno));
385 		exit (EXIT_FAILURE);
386 	}
387 
388 	if (opt_type == IH_TYPE_MULTI || opt_type == IH_TYPE_SCRIPT) {
389 		char *file = datafile;
390 		uint32_t size;
391 
392 		for (;;) {
393 			char *sep = NULL;
394 
395 			if (file) {
396 				if ((sep = strchr(file, ':')) != NULL) {
397 					*sep = '\0';
398 				}
399 
400 				if (stat (file, &sbuf) < 0) {
401 					fprintf (stderr, "%s: Can't stat %s: %s\n",
402 						cmdname, file, strerror(errno));
403 					exit (EXIT_FAILURE);
404 				}
405 				size = htonl(sbuf.st_size);
406 			} else {
407 				size = 0;
408 			}
409 
410 			if (write(ifd, (char *)&size, sizeof(size)) != sizeof(size)) {
411 				fprintf (stderr, "%s: Write error on %s: %s\n",
412 					cmdname, imagefile, strerror(errno));
413 				exit (EXIT_FAILURE);
414 			}
415 
416 			if (!file) {
417 				break;
418 			}
419 
420 			if (sep) {
421 				*sep = ':';
422 				file = sep + 1;
423 			} else {
424 				file = NULL;
425 			}
426 		}
427 
428 		file = datafile;
429 
430 		for (;;) {
431 			char *sep = strchr(file, ':');
432 			if (sep) {
433 				*sep = '\0';
434 				copy_file (ifd, file, 1);
435 				*sep++ = ':';
436 				file = sep;
437 			} else {
438 				copy_file (ifd, file, 0);
439 				break;
440 			}
441 		}
442 	} else {
443 		copy_file (ifd, datafile, 0);
444 	}
445 
446 	/* We're a bit of paranoid */
447 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__) && !defined(__FreeBSD__)
448 	(void) fdatasync (ifd);
449 #else
450 	(void) fsync (ifd);
451 #endif
452 
453 	if (fstat(ifd, &sbuf) < 0) {
454 		fprintf (stderr, "%s: Can't stat %s: %s\n",
455 			cmdname, imagefile, strerror(errno));
456 		exit (EXIT_FAILURE);
457 	}
458 
459 	ptr = (unsigned char *)mmap(0, sbuf.st_size,
460 				    PROT_READ|PROT_WRITE, MAP_SHARED, ifd, 0);
461 	if (ptr == (unsigned char *)MAP_FAILED) {
462 		fprintf (stderr, "%s: Can't map %s: %s\n",
463 			cmdname, imagefile, strerror(errno));
464 		exit (EXIT_FAILURE);
465 	}
466 
467 	hdr = (image_header_t *)ptr;
468 
469 	checksum = crc32 (0,
470 			  (const char *)(ptr + sizeof(image_header_t)),
471 			  sbuf.st_size - sizeof(image_header_t)
472 			 );
473 
474 	/* Build new header */
475 	hdr->ih_magic = htonl(IH_MAGIC);
476 	hdr->ih_time  = htonl(sbuf.st_mtime);
477 	hdr->ih_size  = htonl(sbuf.st_size - sizeof(image_header_t));
478 	hdr->ih_load  = htonl(addr);
479 	hdr->ih_ep    = htonl(ep);
480 	hdr->ih_dcrc  = htonl(checksum);
481 	hdr->ih_os    = opt_os;
482 	hdr->ih_arch  = opt_arch;
483 	hdr->ih_type  = opt_type;
484 	hdr->ih_comp  = opt_comp;
485 
486 	strncpy((char *)hdr->ih_name, name, IH_NMLEN);
487 
488 	checksum = crc32(0,(const char *)hdr,sizeof(image_header_t));
489 
490 	hdr->ih_hcrc = htonl(checksum);
491 
492 	print_header (hdr);
493 
494 	(void) munmap((void *)ptr, sbuf.st_size);
495 
496 	/* We're a bit of paranoid */
497 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__) && !defined(__FreeBSD__)
498 	(void) fdatasync (ifd);
499 #else
500 	(void) fsync (ifd);
501 #endif
502 
503 	if (close(ifd)) {
504 		fprintf (stderr, "%s: Write error on %s: %s\n",
505 			cmdname, imagefile, strerror(errno));
506 		exit (EXIT_FAILURE);
507 	}
508 
509 	exit (EXIT_SUCCESS);
510 }
511 
512 static void
513 copy_file (int ifd, const char *datafile, int pad)
514 {
515 	int dfd;
516 	struct stat sbuf;
517 	unsigned char *ptr;
518 	int tail;
519 	int zero = 0;
520 	int offset = 0;
521 	int size;
522 
523 	if (vflag) {
524 		fprintf (stderr, "Adding Image %s\n", datafile);
525 	}
526 
527 	if ((dfd = open(datafile, O_RDONLY|O_BINARY)) < 0) {
528 		fprintf (stderr, "%s: Can't open %s: %s\n",
529 			cmdname, datafile, strerror(errno));
530 		exit (EXIT_FAILURE);
531 	}
532 
533 	if (fstat(dfd, &sbuf) < 0) {
534 		fprintf (stderr, "%s: Can't stat %s: %s\n",
535 			cmdname, datafile, strerror(errno));
536 		exit (EXIT_FAILURE);
537 	}
538 
539 	ptr = (unsigned char *)mmap(0, sbuf.st_size,
540 				    PROT_READ, MAP_SHARED, dfd, 0);
541 	if (ptr == (unsigned char *)MAP_FAILED) {
542 		fprintf (stderr, "%s: Can't read %s: %s\n",
543 			cmdname, datafile, strerror(errno));
544 		exit (EXIT_FAILURE);
545 	}
546 
547 	if (xflag) {
548 		unsigned char *p = NULL;
549 		/*
550 		 * XIP: do not append the image_header_t at the
551 		 * beginning of the file, but consume the space
552 		 * reserved for it.
553 		 */
554 
555 		if ((unsigned)sbuf.st_size < sizeof(image_header_t)) {
556 			fprintf (stderr,
557 				"%s: Bad size: \"%s\" is too small for XIP\n",
558 				cmdname, datafile);
559 			exit (EXIT_FAILURE);
560 		}
561 
562 		for (p=ptr; p < ptr+sizeof(image_header_t); p++) {
563 			if ( *p != 0xff ) {
564 				fprintf (stderr,
565 					"%s: Bad file: \"%s\" has invalid buffer for XIP\n",
566 					cmdname, datafile);
567 				exit (EXIT_FAILURE);
568 			}
569 		}
570 
571 		offset = sizeof(image_header_t);
572 	}
573 
574 	size = sbuf.st_size - offset;
575 	if (write(ifd, ptr + offset, size) != size) {
576 		fprintf (stderr, "%s: Write error on %s: %s\n",
577 			cmdname, imagefile, strerror(errno));
578 		exit (EXIT_FAILURE);
579 	}
580 
581 	if (pad && ((tail = size % 4) != 0)) {
582 
583 		if (write(ifd, (char *)&zero, 4-tail) != 4-tail) {
584 			fprintf (stderr, "%s: Write error on %s: %s\n",
585 				cmdname, imagefile, strerror(errno));
586 			exit (EXIT_FAILURE);
587 		}
588 	}
589 
590 	(void) munmap((void *)ptr, sbuf.st_size);
591 	(void) close (dfd);
592 }
593 
594 void
595 usage ()
596 {
597 	fprintf (stderr, "Usage: %s -l image\n"
598 			 "          -l ==> list image header information\n"
599 			 "       %s [-x] -A arch -O os -T type -C comp "
600 			 "-a addr -e ep -n name -d data_file[:data_file...] image\n",
601 		cmdname, cmdname);
602 	fprintf (stderr, "          -A ==> set architecture to 'arch'\n"
603 			 "          -O ==> set operating system to 'os'\n"
604 			 "          -T ==> set image type to 'type'\n"
605 			 "          -C ==> set compression type 'comp'\n"
606 			 "          -a ==> set load address to 'addr' (hex)\n"
607 			 "          -e ==> set entry point to 'ep' (hex)\n"
608 			 "          -n ==> set image name to 'name'\n"
609 			 "          -d ==> use image data from 'datafile'\n"
610 			 "          -x ==> set XIP (execute in place)\n"
611 		);
612 	exit (EXIT_FAILURE);
613 }
614 
615 static void
616 print_header (image_header_t *hdr)
617 {
618 	time_t timestamp;
619 	uint32_t size;
620 
621 	timestamp = (time_t)ntohl(hdr->ih_time);
622 	size = ntohl(hdr->ih_size);
623 
624 	printf ("Image Name:   %.*s\n", IH_NMLEN, hdr->ih_name);
625 	printf ("Created:      %s", ctime(&timestamp));
626 	printf ("Image Type:   "); print_type(hdr);
627 	printf ("Data Size:    %d Bytes = %.2f kB = %.2f MB\n",
628 		size, (double)size / 1.024e3, (double)size / 1.048576e6 );
629 	printf ("Load Address: 0x%08X\n", ntohl(hdr->ih_load));
630 	printf ("Entry Point:  0x%08X\n", ntohl(hdr->ih_ep));
631 
632 	if (hdr->ih_type == IH_TYPE_MULTI || hdr->ih_type == IH_TYPE_SCRIPT) {
633 		int i, ptrs;
634 		uint32_t pos;
635 		unsigned long *len_ptr = (unsigned long *) (
636 					(unsigned long)hdr + sizeof(image_header_t)
637 				);
638 
639 		/* determine number of images first (to calculate image offsets) */
640 		for (i=0; len_ptr[i]; ++i)	/* null pointer terminates list */
641 			;
642 		ptrs = i;		/* null pointer terminates list */
643 
644 		pos = sizeof(image_header_t) + ptrs * sizeof(long);
645 		printf ("Contents:\n");
646 		for (i=0; len_ptr[i]; ++i) {
647 			size = ntohl(len_ptr[i]);
648 
649 			printf ("   Image %d: %8d Bytes = %4d kB = %d MB\n",
650 				i, size, size>>10, size>>20);
651 			if (hdr->ih_type == IH_TYPE_SCRIPT && i > 0) {
652 				/*
653 				 * the user may need to know offsets
654 				 * if planning to do something with
655 				 * multiple files
656 				 */
657 				printf ("    Offset = %08X\n", pos);
658 			}
659 			/* copy_file() will pad the first files to even word align */
660 			size += 3;
661 			size &= ~3;
662 			pos += size;
663 		}
664 	}
665 }
666 
667 
668 static void
669 print_type (image_header_t *hdr)
670 {
671 	printf ("%s %s %s (%s)\n",
672 		put_arch (hdr->ih_arch),
673 		put_os   (hdr->ih_os  ),
674 		put_type (hdr->ih_type),
675 		put_comp (hdr->ih_comp)
676 	);
677 }
678 
679 static char *put_arch (int arch)
680 {
681 	return (put_table_entry(arch_name, "Unknown Architecture", arch));
682 }
683 
684 static char *put_os (int os)
685 {
686 	return (put_table_entry(os_name, "Unknown OS", os));
687 }
688 
689 static char *put_type (int type)
690 {
691 	return (put_table_entry(type_name, "Unknown Image", type));
692 }
693 
694 static char *put_comp (int comp)
695 {
696 	return (put_table_entry(comp_name, "Unknown Compression", comp));
697 }
698 
699 static char *put_table_entry (table_entry_t *table, char *msg, int type)
700 {
701 	for (; table->val>=0; ++table) {
702 		if (table->val == type)
703 			return (table->lname);
704 	}
705 	return (msg);
706 }
707 
708 static int get_arch(char *name)
709 {
710 	return (get_table_entry(arch_name, "CPU", name));
711 }
712 
713 
714 static int get_comp(char *name)
715 {
716 	return (get_table_entry(comp_name, "Compression", name));
717 }
718 
719 
720 static int get_os (char *name)
721 {
722 	return (get_table_entry(os_name, "OS", name));
723 }
724 
725 
726 static int get_type(char *name)
727 {
728 	return (get_table_entry(type_name, "Image", name));
729 }
730 
731 static int get_table_entry (table_entry_t *table, char *msg, char *name)
732 {
733 	table_entry_t *t;
734 	int first = 1;
735 
736 	for (t=table; t->val>=0; ++t) {
737 		if (t->sname && strcasecmp(t->sname, name)==0)
738 			return (t->val);
739 	}
740 	fprintf (stderr, "\nInvalid %s Type - valid names are", msg);
741 	for (t=table; t->val>=0; ++t) {
742 		if (t->sname == NULL)
743 			continue;
744 		fprintf (stderr, "%c %s", (first) ? ':' : ',', t->sname);
745 		first = 0;
746 	}
747 	fprintf (stderr, "\n");
748 	return (-1);
749 }
750