tools/mkimage.c

   1 /*
   2  * (C) Copyright 2000-2003
   3  * DENX Software Engineering
   4  * Wolfgang Denk, wd@denx.de
   5  * All rights reserved.
   6  */
   7
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #ifndef __WIN32__
  14 #include <netinet/in.h>         /* for host / network byte order conversions    */
  15 #endif
  16 #include <sys/mman.h>
  17 #include <sys/stat.h>
  18 #include <time.h>
  19 #include <unistd.h>
  20
  21 #if defined(__BEOS__) || defined(__NetBSD__) || defined(__APPLE__)
  22 #include <inttypes.h>
  23 #endif
  24
  25 #ifdef __WIN32__
  26 typedef unsigned int __u32;
  27
  28 #define SWAP_LONG(x) \
  29         ((__u32)( \
  30                 (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
  31                 (((__u32)(x) & (__u32)0x0000ff00UL) <<  8) | \
  32                 (((__u32)(x) & (__u32)0x00ff0000UL) >>  8) | \
  33                 (((__u32)(x) & (__u32)0xff000000UL) >> 24) ))
  34 typedef         unsigned char   uint8_t;
  35 typedef         unsigned short  uint16_t;
  36 typedef         unsigned int    uint32_t;
  37
  38 #define     ntohl(a)    SWAP_LONG(a)
  39 #define     htonl(a)    SWAP_LONG(a)
  40 #endif  /* __WIN32__ */
  41
  42 #ifndef O_BINARY                /* should be define'd on __WIN32__ */
  43 #define O_BINARY        0
  44 #endif
  45
  46 #include <image.h>
  47
  48 extern int errno;
  49
  50 #ifndef MAP_FAILED
  51 #define MAP_FAILED (-1)
  52 #endif
  53
  54 char *cmdname;
  55
  56 extern unsigned long crc32 (unsigned long crc, const char *buf, unsigned int len);
  57
  58 typedef struct table_entry {
  59         int     val;            /* as defined in image.h        */
  60         char    *sname;         /* short (input) name           */
  61         char    *lname;         /* long (output) name           */
  62 } table_entry_t;
  63
  64 table_entry_t arch_name[] = {
  65     {   IH_CPU_INVALID, NULL,           "Invalid CPU",          },
  66     {   IH_CPU_ALPHA,   "alpha",        "Alpha",                },
  67     {   IH_CPU_ARM,     "arm",          "ARM",                  },
  68     {   IH_CPU_I386,    "x86",          "Intel x86",            },
  69     {   IH_CPU_IA64,    "ia64",         "IA64",                 },
  70     {   IH_CPU_MIPS,    "mips",         "MIPS",                 },
  71     {   IH_CPU_MIPS64,  "mips64",       "MIPS 64 Bit",          },
  72     {   IH_CPU_PPC,     "ppc",          "PowerPC",              },
  73     {   IH_CPU_S390,    "s390",         "IBM S390",             },
  74     {   IH_CPU_SH,      "sh",           "SuperH",               },
  75     {   IH_CPU_SPARC,   "sparc",        "SPARC",                },
  76     {   IH_CPU_SPARC64, "sparc64",      "SPARC 64 Bit",         },
  77     {   IH_CPU_M68K,    "m68k",         "MC68000",              },
  78     {   -1,             "",             "",                     },
  79 };
  80
  81 table_entry_t os_name[] = {
  82     {   IH_OS_INVALID,  NULL,           "Invalid OS",           },
  83     {   IH_OS_OPENBSD,  "openbsd",      "OpenBSD",              },
  84     {   IH_OS_NETBSD,   "netbsd",       "NetBSD",               },
  85     {   IH_OS_FREEBSD,  "freebsd",      "FreeBSD",              },
  86     {   IH_OS_4_4BSD,   "4_4bsd",       "4_4BSD",               },
  87     {   IH_OS_LINUX,    "linux",        "Linux",                },
  88     {   IH_OS_SVR4,     "svr4",         "SVR4",                 },
  89     {   IH_OS_ESIX,     "esix",         "Esix",                 },
  90     {   IH_OS_SOLARIS,  "solaris",      "Solaris",              },
  91     {   IH_OS_IRIX,     "irix",         "Irix",                 },
  92     {   IH_OS_SCO,      "sco",          "SCO",                  },
  93     {   IH_OS_DELL,     "dell",         "Dell",                 },
  94     {   IH_OS_NCR,      "ncr",          "NCR",                  },
  95     {   IH_OS_LYNXOS,   "lynxos",       "LynxOS",               },
  96     {   IH_OS_VXWORKS,  "vxworks",      "VxWorks",              },
  97     {   IH_OS_PSOS,     "psos",         "pSOS",                 },
  98     {   IH_OS_QNX,      "qnx",          "QNX",                  },
  99     {   IH_OS_U_BOOT,   "u-boot",       "U-Boot",               },
 100     {   IH_OS_RTEMS,    "rtems",        "RTEMS",                },
 101     {   IH_OS_ARTOS,    "artos",        "ARTOS",                },
 102     {   -1,             "",             "",                     },
 103 };
 104
 105 table_entry_t type_name[] = {
 106     {   IH_TYPE_INVALID,    NULL,         "Invalid Image",      },
 107     {   IH_TYPE_STANDALONE, "standalone", "Standalone Program", },
 108     {   IH_TYPE_KERNEL,     "kernel",     "Kernel Image",       },
 109     {   IH_TYPE_RAMDISK,    "ramdisk",    "RAMDisk Image",      },
 110     {   IH_TYPE_MULTI,      "multi",      "Multi-File Image",   },
 111     {   IH_TYPE_FIRMWARE,   "firmware",   "Firmware",           },
 112     {   IH_TYPE_SCRIPT,     "script",     "Script",             },
 113     {   IH_TYPE_FILESYSTEM, "filesystem", "Filesystem Image",   },
 114     {   -1,                 "",           "",                   },
 115 };
 116
 117 table_entry_t comp_name[] = {
 118     {   IH_COMP_NONE,   "none",         "uncompressed",         },
 119     {   IH_COMP_GZIP,   "gzip",         "gzip compressed",      },
 120     {   IH_COMP_BZIP2,  "bzip2",        "bzip2 compressed",     },
 121     {   -1,             "",             "",                     },
 122 };
 123
 124 static  void    copy_file (int, const char *, int);
 125 static  void    usage   (void);
 126 static  void    print_header (image_header_t *);
 127 static  void    print_type (image_header_t *);
 128 static  char    *put_table_entry (table_entry_t *, char *, int);
 129 static  char    *put_arch (int);
 130 static  char    *put_type (int);
 131 static  char    *put_os   (int);
 132 static  char    *put_comp (int);
 133 static  int     get_table_entry (table_entry_t *, char *, char *);
 134 static  int     get_arch(char *);
 135 static  int     get_comp(char *);
 136 static  int     get_os  (char *);
 137 static  int     get_type(char *);
 138
 139
 140 char    *datafile;
 141 char    *imagefile;
 142
 143 int dflag    = 0;
 144 int eflag    = 0;
 145 int lflag    = 0;
 146 int vflag    = 0;
 147 int xflag    = 0;
 148 int opt_os   = IH_OS_LINUX;
 149 int opt_arch = IH_CPU_PPC;
 150 int opt_type = IH_TYPE_KERNEL;
 151 int opt_comp = IH_COMP_GZIP;
 152
 153 image_header_t header;
 154 image_header_t *hdr = &header;
 155
 156 int
 157 main (int argc, char **argv)
 158 {
 159         int ifd;
 160         uint32_t checksum;
 161         uint32_t addr;
 162         uint32_t ep;
 163         struct stat sbuf;
 164         unsigned char *ptr;
 165         char *name = "";
 166
 167         cmdname = *argv;
 168
 169         addr = ep = 0;
 170
 171         while (--argc > 0 && **++argv == '-') {
 172                 while (*++*argv) {
 173                         switch (**argv) {
 174                         case 'l':
 175                                 lflag = 1;
 176                                 break;
 177                         case 'A':
 178                                 if ((--argc <= 0) ||
 179                                     (opt_arch = get_arch(*++argv)) < 0)
 180                                         usage ();
 181                                 goto NXTARG;
 182                         case 'C':
 183                                 if ((--argc <= 0) ||
 184                                     (opt_comp = get_comp(*++argv)) < 0)
 185                                         usage ();
 186                                 goto NXTARG;
 187                         case 'O':
 188                                 if ((--argc <= 0) ||
 189                                     (opt_os = get_os(*++argv)) < 0)
 190                                         usage ();
 191                                 goto NXTARG;
 192                         case 'T':
 193                                 if ((--argc <= 0) ||
 194                                     (opt_type = get_type(*++argv)) < 0)
 195                                         usage ();
 196                                 goto NXTARG;
 197
 198                         case 'a':
 199                                 if (--argc <= 0)
 200                                         usage ();
 201                                 addr = strtoul (*++argv, (char **)&ptr, 16);
 202                                 if (*ptr) {
 203                                         fprintf (stderr,
 204                                                 "%s: invalid load address %s\n",
 205                                                 cmdname, *argv);
 206                                         exit (EXIT_FAILURE);
 207                                 }
 208                                 goto NXTARG;
 209                         case 'd':
 210                                 if (--argc <= 0)
 211                                         usage ();
 212                                 datafile = *++argv;
 213                                 dflag = 1;
 214                                 goto NXTARG;
 215                         case 'e':
 216                                 if (--argc <= 0)
 217                                         usage ();
 218                                 ep = strtoul (*++argv, (char **)&ptr, 16);
 219                                 if (*ptr) {
 220                                         fprintf (stderr,
 221                                                 "%s: invalid entry point %s\n",
 222                                                 cmdname, *argv);
 223                                         exit (EXIT_FAILURE);
 224                                 }
 225                                 eflag = 1;
 226                                 goto NXTARG;
 227                         case 'n':
 228                                 if (--argc <= 0)
 229                                         usage ();
 230                                 name = *++argv;
 231                                 goto NXTARG;
 232                         case 'v':
 233                                 vflag++;
 234                                 break;
 235                         case 'x':
 236                                 xflag++;
 237                                 break;
 238                         default:
 239                                 usage ();
 240                         }
 241                 }
 242 NXTARG:         ;
 243         }
 244
 245         if ((argc != 1) || ((lflag ^ dflag) == 0))
 246                 usage();
 247
 248         if (!eflag) {
 249                 ep = addr;
 250                 /* If XIP, entry point must be after the U-Boot header */
 251                 if (xflag)
 252                         ep += sizeof(image_header_t);
 253         }
 254
 255         /*
 256          * If XIP, ensure the entry point is equal to the load address plus
 257          * the size of the U-Boot header.
 258          */
 259         if (xflag) {
 260                 if (ep != addr + sizeof(image_header_t)) {
 261                         fprintf (stderr, "%s: For XIP, the entry point must be the load addr + %lu\n",
 262                                 cmdname,
 263                                 (unsigned long)sizeof(image_header_t));
 264                         exit (EXIT_FAILURE);
 265                 }
 266         }
 267
 268         imagefile = *argv;
 269
 270         if (lflag) {
 271                 ifd = open(imagefile, O_RDONLY);
 272         } else {
 273                 ifd = open(imagefile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, 0666);
 274         }
 275
 276         if (ifd < 0) {
 277                 fprintf (stderr, "%s: Can't open %s: %s\n",
 278                         cmdname, imagefile, strerror(errno));
 279                 exit (EXIT_FAILURE);
 280         }
 281
 282         if (lflag) {
 283                 int len;
 284                 char *data;
 285                 /*
 286                  * list header information of existing image
 287                  */
 288                 if (fstat(ifd, &sbuf) < 0) {
 289                         fprintf (stderr, "%s: Can't stat %s: %s\n",
 290                                 cmdname, imagefile, strerror(errno));
 291                         exit (EXIT_FAILURE);
 292                 }
 293
 294                 if (sbuf.st_size < sizeof(image_header_t)) {
 295                         fprintf (stderr,
 296                                 "%s: Bad size: \"%s\" is no valid image\n",
 297                                 cmdname, imagefile);
 298                         exit (EXIT_FAILURE);
 299                 }
 300
 301                 ptr = (unsigned char *)mmap(0, sbuf.st_size,
 302                                             PROT_READ, MAP_SHARED, ifd, 0);
 303                 if ((caddr_t)ptr == (caddr_t)-1) {
 304                         fprintf (stderr, "%s: Can't read %s: %s\n",
 305                                 cmdname, imagefile, strerror(errno));
 306                         exit (EXIT_FAILURE);
 307                 }
 308
 309                 /*
 310                  * create copy of header so that we can blank out the
 311                  * checksum field for checking - this can't be done
 312                  * on the PROT_READ mapped data.
 313                  */
 314                 memcpy (hdr, ptr, sizeof(image_header_t));
 315
 316                 if (ntohl(hdr->ih_magic) != IH_MAGIC) {
 317                         fprintf (stderr,
 318                                 "%s: Bad Magic Number: \"%s\" is no valid image\n",
 319                                 cmdname, imagefile);
 320                         exit (EXIT_FAILURE);
 321                 }
 322
 323                 data = (char *)hdr;
 324                 len  = sizeof(image_header_t);
 325
 326                 checksum = ntohl(hdr->ih_hcrc);
 327                 hdr->ih_hcrc = htonl(0);        /* clear for re-calculation */
 328
 329                 if (crc32 (0, data, len) != checksum) {
 330                         fprintf (stderr,
 331                                 "*** Warning: \"%s\" has bad header checksum!\n",
 332                                 imagefile);
 333                 }
 334
 335                 data = (char *)(ptr + sizeof(image_header_t));
 336                 len  = sbuf.st_size - sizeof(image_header_t) ;
 337
 338                 if (crc32 (0, data, len) != ntohl(hdr->ih_dcrc)) {
 339                         fprintf (stderr,
 340                                 "*** Warning: \"%s\" has corrupted data!\n",
 341                                 imagefile);
 342                 }
 343
 344                 /* for multi-file images we need the data part, too */
 345                 print_header ((image_header_t *)ptr);
 346
 347                 (void) munmap((void *)ptr, sbuf.st_size);
 348                 (void) close (ifd);
 349
 350                 exit (EXIT_SUCCESS);
 351         }
 352
 353         /*
 354          * Must be -w then:
 355          *
 356          * write dummy header, to be fixed later
 357          */
 358         memset (hdr, 0, sizeof(image_header_t));
 359
 360         if (write(ifd, hdr, sizeof(image_header_t)) != sizeof(image_header_t)) {
 361                 fprintf (stderr, "%s: Write error on %s: %s\n",
 362                         cmdname, imagefile, strerror(errno));
 363                 exit (EXIT_FAILURE);
 364         }
 365
 366         if (opt_type == IH_TYPE_MULTI || opt_type == IH_TYPE_SCRIPT) {
 367                 char *file = datafile;
 368                 unsigned long size;
 369
 370                 for (;;) {
 371                         char *sep = NULL;
 372
 373                         if (file) {
 374                                 if ((sep = strchr(file, ':')) != NULL) {
 375                                         *sep = '\0';
 376                                 }
 377
 378                                 if (stat (file, &sbuf) < 0) {
 379                                         fprintf (stderr, "%s: Can't stat %s: %s\n",
 380                                                 cmdname, file, strerror(errno));
 381                                         exit (EXIT_FAILURE);
 382                                 }
 383                                 size = htonl(sbuf.st_size);
 384                         } else {
 385                                 size = 0;
 386                         }
 387
 388                         if (write(ifd, (char *)&size, sizeof(size)) != sizeof(size)) {
 389                                 fprintf (stderr, "%s: Write error on %s: %s\n",
 390                                         cmdname, imagefile, strerror(errno));
 391                                 exit (EXIT_FAILURE);
 392                         }
 393
 394                         if (!file) {
 395                                 break;
 396                         }
 397
 398                         if (sep) {
 399                                 *sep = ':';
 400                                 file = sep + 1;
 401                         } else {
 402                                 file = NULL;
 403                         }
 404                 }
 405
 406                 file = datafile;
 407
 408                 for (;;) {
 409                         char *sep = strchr(file, ':');
 410                         if (sep) {
 411                                 *sep = '\0';
 412                                 copy_file (ifd, file, 1);
 413                                 *sep++ = ':';
 414                                 file = sep;
 415                         } else {
 416                                 copy_file (ifd, file, 0);
 417                                 break;
 418                         }
 419                 }
 420         } else {
 421                 copy_file (ifd, datafile, 0);
 422         }
 423
 424         /* We're a bit of paranoid */
 425 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__)
 426         (void) fdatasync (ifd);
 427 #else
 428         (void) fsync (ifd);
 429 #endif
 430
 431         if (fstat(ifd, &sbuf) < 0) {
 432                 fprintf (stderr, "%s: Can't stat %s: %s\n",
 433                         cmdname, imagefile, strerror(errno));
 434                 exit (EXIT_FAILURE);
 435         }
 436
 437         ptr = (unsigned char *)mmap(0, sbuf.st_size,
 438                                     PROT_READ|PROT_WRITE, MAP_SHARED, ifd, 0);
 439         if (ptr == (unsigned char *)MAP_FAILED) {
 440                 fprintf (stderr, "%s: Can't map %s: %s\n",
 441                         cmdname, imagefile, strerror(errno));
 442                 exit (EXIT_FAILURE);
 443         }
 444
 445         hdr = (image_header_t *)ptr;
 446
 447         checksum = crc32 (0,
 448                           (const char *)(ptr + sizeof(image_header_t)),
 449                           sbuf.st_size - sizeof(image_header_t)
 450                          );
 451
 452         /* Build new header */
 453         hdr->ih_magic = htonl(IH_MAGIC);
 454         hdr->ih_time  = htonl(sbuf.st_mtime);
 455         hdr->ih_size  = htonl(sbuf.st_size - sizeof(image_header_t));
 456         hdr->ih_load  = htonl(addr);
 457         hdr->ih_ep    = htonl(ep);
 458         hdr->ih_dcrc  = htonl(checksum);
 459         hdr->ih_os    = opt_os;
 460         hdr->ih_arch  = opt_arch;
 461         hdr->ih_type  = opt_type;
 462         hdr->ih_comp  = opt_comp;
 463
 464         strncpy((char *)hdr->ih_name, name, IH_NMLEN);
 465
 466         checksum = crc32(0,(const char *)hdr,sizeof(image_header_t));
 467
 468         hdr->ih_hcrc = htonl(checksum);
 469
 470         print_header (hdr);
 471
 472         (void) munmap((void *)ptr, sbuf.st_size);
 473
 474         /* We're a bit of paranoid */
 475 #if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__)
 476         (void) fdatasync (ifd);
 477 #else
 478         (void) fsync (ifd);
 479 #endif
 480
 481         if (close(ifd)) {
 482                 fprintf (stderr, "%s: Write error on %s: %s\n",
 483                         cmdname, imagefile, strerror(errno));
 484                 exit (EXIT_FAILURE);
 485         }
 486
 487         exit (EXIT_SUCCESS);
 488 }
 489
 490 static void
 491 copy_file (int ifd, const char *datafile, int pad)
 492 {
 493         int dfd;
 494         struct stat sbuf;
 495         unsigned char *ptr;
 496         int tail;
 497         int zero = 0;
 498         int offset = 0;
 499         int size;
 500
 501         if (vflag) {
 502                 fprintf (stderr, "Adding Image %s\n", datafile);
 503         }
 504
 505         if ((dfd = open(datafile, O_RDONLY)) < 0) {
 506                 fprintf (stderr, "%s: Can't open %s: %s\n",
 507                         cmdname, datafile, strerror(errno));
 508                 exit (EXIT_FAILURE);
 509         }
 510
 511         if (fstat(dfd, &sbuf) < 0) {
 512                 fprintf (stderr, "%s: Can't stat %s: %s\n",
 513                         cmdname, datafile, strerror(errno));
 514                 exit (EXIT_FAILURE);
 515         }
 516
 517         ptr = (unsigned char *)mmap(0, sbuf.st_size,
 518                                     PROT_READ, MAP_SHARED, dfd, 0);
 519         if (ptr == (unsigned char *)MAP_FAILED) {
 520                 fprintf (stderr, "%s: Can't read %s: %s\n",
 521                         cmdname, datafile, strerror(errno));
 522                 exit (EXIT_FAILURE);
 523         }
 524
 525         if (xflag) {
 526                 unsigned char *p = NULL;
 527                 /*
 528                  * XIP: do not append the image_header_t at the
 529                  * beginning of the file, but consume the space
 530                  * reserved for it.
 531                  */
 532
 533                 if (sbuf.st_size < sizeof(image_header_t)) {
 534                         fprintf (stderr,
 535                                 "%s: Bad size: \"%s\" is too small for XIP\n",
 536                                 cmdname, datafile);
 537                         exit (EXIT_FAILURE);
 538                 }
 539
 540                 for (p=ptr; p < ptr+sizeof(image_header_t); p++) {
 541                         if ( *p != 0xff ) {
 542                                 fprintf (stderr,
 543                                         "%s: Bad file: \"%s\" has invalid buffer for XIP\n",
 544                                         cmdname, datafile);
 545                                 exit (EXIT_FAILURE);
 546                         }
 547                 }
 548
 549                 offset = sizeof(image_header_t);
 550         }
 551
 552         size = sbuf.st_size - offset;
 553         if (write(ifd, ptr + offset, size) != size) {
 554                 fprintf (stderr, "%s: Write error on %s: %s\n",
 555                         cmdname, imagefile, strerror(errno));
 556                 exit (EXIT_FAILURE);
 557         }
 558
 559         if (pad && ((tail = size % 4) != 0)) {
 560
 561                 if (write(ifd, (char *)&zero, 4-tail) != 4-tail) {
 562                         fprintf (stderr, "%s: Write error on %s: %s\n",
 563                                 cmdname, imagefile, strerror(errno));
 564                         exit (EXIT_FAILURE);
 565                 }
 566         }
 567
 568         (void) munmap((void *)ptr, sbuf.st_size);
 569         (void) close (dfd);
 570 }
 571
 572 void
 573 usage ()
 574 {
 575         fprintf (stderr, "Usage: %s -l image\n"
 576                          "          -l ==> list image header information\n"
 577                          "       %s -A arch -O os -T type -C comp "
 578                          "-a addr -e ep -n name -d data_file[:data_file...] image\n",
 579                 cmdname, cmdname);
 580         fprintf (stderr, "          -A ==> set architecture to 'arch'\n"
 581                          "          -O ==> set operating system to 'os'\n"
 582                          "          -T ==> set image type to 'type'\n"
 583                          "          -C ==> set compression type 'comp'\n"
 584                          "          -a ==> set load address to 'addr' (hex)\n"
 585                          "          -e ==> set entry point to 'ep' (hex)\n"
 586                          "          -n ==> set image name to 'name'\n"
 587                          "          -d ==> use image data from 'datafile'\n"
 588                          "          -x ==> set XIP (execute in place)\n"
 589                 );
 590         exit (EXIT_FAILURE);
 591 }
 592
 593 static void
 594 print_header (image_header_t *hdr)
 595 {
 596         time_t timestamp;
 597         uint32_t size;
 598
 599         timestamp = (time_t)ntohl(hdr->ih_time);
 600         size = ntohl(hdr->ih_size);
 601
 602         printf ("Image Name:   %.*s\n", IH_NMLEN, hdr->ih_name);
 603         printf ("Created:      %s", ctime(&timestamp));
 604         printf ("Image Type:   "); print_type(hdr);
 605         printf ("Data Size:    %d Bytes = %.2f kB = %.2f MB\n",
 606                 size, (double)size / 1.024e3, (double)size / 1.048576e6 );
 607         printf ("Load Address: 0x%08X\n", ntohl(hdr->ih_load));
 608         printf ("Entry Point:  0x%08X\n", ntohl(hdr->ih_ep));
 609
 610         if (hdr->ih_type == IH_TYPE_MULTI || hdr->ih_type == IH_TYPE_SCRIPT) {
 611                 int i, ptrs;
 612                 uint32_t pos;
 613                 unsigned long *len_ptr = (unsigned long *) (
 614                                         (unsigned long)hdr + sizeof(image_header_t)
 615                                 );
 616
 617                 /* determine number of images first (to calculate image offsets) */
 618                 for (i=0; len_ptr[i]; ++i)      /* null pointer terminates list */
 619                         ;
 620                 ptrs = i;               /* null pointer terminates list */
 621
 622                 pos = sizeof(image_header_t) + ptrs * sizeof(long);
 623                 printf ("Contents:\n");
 624                 for (i=0; len_ptr[i]; ++i) {
 625                         size = ntohl(len_ptr[i]);
 626
 627                         printf ("   Image %d: %8d Bytes = %4d kB = %d MB\n",
 628                                 i, size, size>>10, size>>20);
 629                         if (hdr->ih_type == IH_TYPE_SCRIPT && i > 0) {
 630                                 /*
 631                                  * the user may need to know offsets
 632                                  * if planning to do something with
 633                                  * multiple files
 634                                  */
 635                                 printf ("    Offset = %08X\n", pos);
 636                         }
 637                         /* copy_file() will pad the first files to even word align */
 638                         size += 3;
 639                         size &= ~3;
 640                         pos += size;
 641                 }
 642         }
 643 }
 644
 645
 646 static void
 647 print_type (image_header_t *hdr)
 648 {
 649         printf ("%s %s %s (%s)\n",
 650                 put_arch (hdr->ih_arch),
 651                 put_os   (hdr->ih_os  ),
 652                 put_type (hdr->ih_type),
 653                 put_comp (hdr->ih_comp)
 654         );
 655 }
 656
 657 static char *put_arch (int arch)
 658 {
 659         return (put_table_entry(arch_name, "Unknown Architecture", arch));
 660 }
 661
 662 static char *put_os (int os)
 663 {
 664         return (put_table_entry(os_name, "Unknown OS", os));
 665 }
 666
 667 static char *put_type (int type)
 668 {
 669         return (put_table_entry(type_name, "Unknown Image", type));
 670 }
 671
 672 static char *put_comp (int comp)
 673 {
 674         return (put_table_entry(comp_name, "Unknown Compression", comp));
 675 }
 676
 677 static char *put_table_entry (table_entry_t *table, char *msg, int type)
 678 {
 679         for (; table->val>=0; ++table) {
 680                 if (table->val == type)
 681                         return (table->lname);
 682         }
 683         return (msg);
 684 }
 685
 686 static int get_arch(char *name)
 687 {
 688         return (get_table_entry(arch_name, "CPU", name));
 689 }
 690
 691
 692 static int get_comp(char *name)
 693 {
 694         return (get_table_entry(comp_name, "Compression", name));
 695 }
 696
 697
 698 static int get_os (char *name)
 699 {
 700         return (get_table_entry(os_name, "OS", name));
 701 }
 702
 703
 704 static int get_type(char *name)
 705 {
 706         return (get_table_entry(type_name, "Image", name));
 707 }
 708
 709 static int get_table_entry (table_entry_t *table, char *msg, char *name)
 710 {
 711         table_entry_t *t;
 712         int first = 1;
 713
 714         for (t=table; t->val>=0; ++t) {
 715                 if (t->sname && strcasecmp(t->sname, name)==0)
 716                         return (t->val);
 717         }
 718         fprintf (stderr, "\nInvalid %s Type - valid names are", msg);
 719         for (t=table; t->val>=0; ++t) {
 720                 if (t->sname == NULL)
 721                         continue;
 722                 fprintf (stderr, "%c %s", (first) ? ':' : ',', t->sname);
 723                 first = 0;
 724         }
 725         fprintf (stderr, "\n");
 726         return (-1);
 727 }