src/ptgen.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ptgen - partition table generator
   4  * Copyright (C) 2006 by Felix Fietkau <nbd@nbd.name>
   5  *
   6  * uses parts of afdisk
   7  * Copyright (C) 2002 by David Roetzel <david@roetzel.de>
   8  *
   9  * UUID/GUID definition stolen from kernel/include/uapi/linux/uuid.h
  10  * Copyright (C) 2010, Intel Corp. Huang Ying <ying.huang@intel.com>
  11  */
  12
  13 #include <byteswap.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <string.h>
  17 #include <unistd.h>
  18 #include <stdlib.h>
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <stdbool.h>
  22 #include <ctype.h>
  23 #include <inttypes.h>
  24 #include <fcntl.h>
  25 #include <stdint.h>
  26 #include "cyg_crc.h"
  27
  28 #if __BYTE_ORDER == __BIG_ENDIAN
  29 #define cpu_to_le16(x) bswap_16(x)
  30 #define cpu_to_le32(x) bswap_32(x)
  31 #define cpu_to_le64(x) bswap_64(x)
  32 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  33 #define cpu_to_le16(x) (x)
  34 #define cpu_to_le32(x) (x)
  35 #define cpu_to_le64(x) (x)
  36 #else
  37 #error unknown endianness!
  38 #endif
  39
  40 #define swap(a, b) \
  41         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
  42
  43 #define BIT(_x)         (1UL << (_x))
  44
  45 typedef struct {
  46         uint8_t b[16];
  47 } guid_t;
  48
  49 #define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)                      \
  50 ((guid_t)                                                               \
  51 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
  52    (b) & 0xff, ((b) >> 8) & 0xff,                                       \
  53    (c) & 0xff, ((c) >> 8) & 0xff,                                       \
  54    (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
  55
  56 #define GUID_STRING_LENGTH      36
  57
  58 #define GPT_SIGNATURE 0x5452415020494645ULL
  59 #define GPT_REVISION 0x00010000
  60
  61 #define GUID_PARTITION_SYSTEM \
  62         GUID_INIT( 0xC12A7328, 0xF81F, 0x11d2, \
  63                         0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
  64
  65 #define GUID_PARTITION_BASIC_DATA \
  66         GUID_INIT( 0xEBD0A0A2, 0xB9E5, 0x4433, \
  67                         0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
  68
  69 #define GUID_PARTITION_BIOS_BOOT \
  70         GUID_INIT( 0x21686148, 0x6449, 0x6E6F, \
  71                         0x74, 0x4E, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49)
  72
  73 #define GUID_PARTITION_CHROME_OS_KERNEL \
  74         GUID_INIT( 0xFE3A2A5D, 0x4F32, 0x41A7, \
  75                         0xB7, 0x25, 0xAC, 0xCC, 0x32, 0x85, 0xA3, 0x09)
  76
  77 #define GUID_PARTITION_LINUX_FIT_GUID \
  78         GUID_INIT( 0xcae9be83, 0xb15f, 0x49cc, \
  79                         0x86, 0x3f, 0x08, 0x1b, 0x74, 0x4a, 0x2d, 0x93)
  80
  81 #define GUID_PARTITION_LINUX_FS_GUID \
  82         GUID_INIT( 0x0fc63daf, 0x8483, 0x4772, \
  83                         0x8e, 0x79, 0x3d, 0x69, 0xd8, 0x47, 0x7d, 0xe4)
  84
  85 #define GPT_HEADER_SIZE         92
  86 #define GPT_ENTRY_SIZE          128
  87 #define GPT_ENTRY_MAX           128
  88 #define GPT_ENTRY_NAME_SIZE     72
  89 #define GPT_SIZE                GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE
  90
  91 #define GPT_ATTR_PLAT_REQUIRED  BIT(0)
  92 #define GPT_ATTR_EFI_IGNORE     BIT(1)
  93 #define GPT_ATTR_LEGACY_BOOT    BIT(2)
  94
  95 #define GPT_HEADER_SECTOR       1
  96 #define GPT_FIRST_ENTRY_SECTOR  2
  97
  98 #define MBR_ENTRY_MAX           4
  99 #define MBR_DISK_SIGNATURE_OFFSET  440
 100 #define MBR_PARTITION_ENTRY_OFFSET 446
 101 #define MBR_BOOT_SIGNATURE_OFFSET  510
 102
 103 #define DISK_SECTOR_SIZE        512
 104
 105 /* Partition table entry */
 106 struct pte {
 107         uint8_t active;
 108         uint8_t chs_start[3];
 109         uint8_t type;
 110         uint8_t chs_end[3];
 111         uint32_t start;
 112         uint32_t length;
 113 };
 114
 115 struct partinfo {
 116         unsigned long actual_start;
 117         unsigned long start;
 118         unsigned long size;
 119         int type;
 120         int hybrid;
 121         char *name;
 122         short int required;
 123         bool has_guid;
 124         guid_t guid;
 125         uint64_t gattr;  /* GPT partition attributes */
 126 };
 127
 128 /* GPT Partition table header */
 129 struct gpth {
 130         uint64_t signature;
 131         uint32_t revision;
 132         uint32_t size;
 133         uint32_t crc32;
 134         uint32_t reserved;
 135         uint64_t self;
 136         uint64_t alternate;
 137         uint64_t first_usable;
 138         uint64_t last_usable;
 139         guid_t disk_guid;
 140         uint64_t first_entry;
 141         uint32_t entry_num;
 142         uint32_t entry_size;
 143         uint32_t entry_crc32;
 144 } __attribute__((packed));
 145
 146 /* GPT Partition table entry */
 147 struct gpte {
 148         guid_t type;
 149         guid_t guid;
 150         uint64_t start;
 151         uint64_t end;
 152         uint64_t attr;
 153         char name[GPT_ENTRY_NAME_SIZE];
 154 } __attribute__((packed));
 155
 156
 157 int verbose = 0;
 158 int active = 1;
 159 int heads = -1;
 160 int sectors = -1;
 161 int kb_align = 0;
 162 bool ignore_null_sized_partition = false;
 163 bool use_guid_partition_table = false;
 164 struct partinfo parts[GPT_ENTRY_MAX];
 165 char *filename = NULL;
 166
 167
 168 /*
 169  * parse the size argument, which is either
 170  * a simple number (K assumed) or
 171  * K, M or G
 172  *
 173  * returns the size in KByte
 174  */
 175 static long to_kbytes(const char *string)
 176 {
 177         int exp = 0;
 178         long result;
 179         char *end;
 180
 181         result = strtoul(string, &end, 0);
 182         switch (tolower(*end)) {
 183                 case 'k' :
 184                 case '\0' : exp = 0; break;
 185                 case 'm' : exp = 1; break;
 186                 case 'g' : exp = 2; break;
 187                 default: return 0;
 188         }
 189
 190         if (*end)
 191                 end++;
 192
 193         if (*end) {
 194                 fputs("garbage after end of number\n", stderr);
 195                 return 0;
 196         }
 197
 198         /* result: number + 1024^(exp) */
 199         if (exp == 0)
 200                 return result;
 201         return result * (2 << ((10 * exp) - 1));
 202 }
 203
 204 /* convert the sector number into a CHS value for the partition table */
 205 static void to_chs(long sect, unsigned char chs[3])
 206 {
 207         int c,h,s;
 208
 209         s = (sect % sectors) + 1;
 210         sect = sect / sectors;
 211         h = sect % heads;
 212         sect = sect / heads;
 213         c = sect;
 214
 215         chs[0] = h;
 216         chs[1] = s | ((c >> 2) & 0xC0);
 217         chs[2] = c & 0xFF;
 218
 219         return;
 220 }
 221
 222 /* round the sector number up to the next cylinder */
 223 static inline unsigned long round_to_cyl(long sect)
 224 {
 225         int cyl_size = heads * sectors;
 226
 227         return sect + cyl_size - (sect % cyl_size);
 228 }
 229
 230 /* round the sector number up to the kb_align boundary */
 231 static inline unsigned long round_to_kb(long sect) {
 232         return ((sect - 1) / kb_align + 1) * kb_align;
 233 }
 234
 235 /* Compute a CRC for guid partition table */
 236 static inline unsigned long gpt_crc32(void *buf, unsigned long len)
 237 {
 238         return cyg_crc32_accumulate(~0L, buf, len) ^ ~0L;
 239 }
 240
 241 /* Parse a guid string to guid_t struct */
 242 static inline int guid_parse(char *buf, guid_t *guid)
 243 {
 244         char b[4] = {0};
 245         char *p = buf;
 246         unsigned i = 0;
 247         if (strnlen(buf, GUID_STRING_LENGTH) != GUID_STRING_LENGTH)
 248                 return -1;
 249         for (i = 0; i < sizeof(guid_t); i++) {
 250                 if (*p == '-')
 251                         p++;
 252                 if (*p == '\0')
 253                         return -1;
 254                 memcpy(b, p, 2);
 255                 guid->b[i] = strtol(b, 0, 16);
 256                 p += 2;
 257         }
 258         swap(guid->b[0], guid->b[3]);
 259         swap(guid->b[1], guid->b[2]);
 260         swap(guid->b[4], guid->b[5]);
 261         swap(guid->b[6], guid->b[7]);
 262         return 0;
 263 }
 264
 265 /*
 266  * Map GPT partition types to partition GUIDs.
 267  * NB: not all GPT partition types have an equivalent MBR type.
 268  */
 269 static inline bool parse_gpt_parttype(const char *type, struct partinfo *part)
 270 {
 271         if (!strcmp(type, "cros_kernel")) {
 272                 part->has_guid = true;
 273                 part->guid = GUID_PARTITION_CHROME_OS_KERNEL;
 274                 /* Default attributes: bootable kernel. */
 275                 part->gattr = (1ULL << 48) |  /* priority=1 */
 276                               (1ULL << 56);  /* success=1 */
 277                 return true;
 278         }
 279         return false;
 280 }
 281
 282 /* init an utf-16 string from utf-8 string */
 283 static inline void init_utf16(char *str, uint16_t *buf, unsigned bufsize)
 284 {
 285         unsigned i, n = 0;
 286         for (i = 0; i < bufsize; i++) {
 287                 if (str[n] == 0x00) {
 288                         buf[i] = 0x00;
 289                         return ;
 290                 } else if ((str[n] & 0x80) == 0x00) {//0xxxxxxx
 291                         buf[i] = cpu_to_le16(str[n++]);
 292                 } else if ((str[n] & 0xE0) == 0xC0) {//110xxxxx
 293                         buf[i] = cpu_to_le16((str[n] & 0x1F) << 6 | (str[n + 1] & 0x3F));
 294                         n += 2;
 295                 } else if ((str[n] & 0xF0) == 0xE0) {//1110xxxx
 296                         buf[i] = cpu_to_le16((str[n] & 0x0F) << 12 | (str[n + 1] & 0x3F) << 6 | (str[n + 2] & 0x3F));
 297                         n += 3;
 298                 } else {
 299                         buf[i] = cpu_to_le16('?');
 300                         n++;
 301                 }
 302         }
 303 }
 304
 305 /* check the partition sizes and write the partition table */
 306 static int gen_ptable(uint32_t signature, int nr)
 307 {
 308         struct pte pte[MBR_ENTRY_MAX];
 309         unsigned long start, len, sect = 0;
 310         int i, fd, ret = -1;
 311
 312         memset(pte, 0, sizeof(struct pte) * MBR_ENTRY_MAX);
 313         for (i = 0; i < nr; i++) {
 314                 if (!parts[i].size) {
 315                         if (ignore_null_sized_partition)
 316                                 continue;
 317                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 318                         return ret;
 319                 }
 320
 321                 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
 322                 pte[i].type = parts[i].type;
 323
 324                 start = sect + sectors;
 325                 if (parts[i].start != 0) {
 326                         if (parts[i].start * 2 < start) {
 327                                 fprintf(stderr, "Invalid start %ld for partition %d!\n",
 328                                         parts[i].start, i);
 329                                 return ret;
 330                         }
 331                         start = parts[i].start * 2;
 332                 } else if (kb_align != 0) {
 333                         start = round_to_kb(start);
 334                 }
 335                 pte[i].start = cpu_to_le32(start);
 336
 337                 sect = start + parts[i].size * 2;
 338                 if (kb_align == 0)
 339                         sect = round_to_cyl(sect);
 340                 pte[i].length = cpu_to_le32(len = sect - start);
 341
 342                 to_chs(start, pte[i].chs_start);
 343                 to_chs(start + len - 1, pte[i].chs_end);
 344
 345                 if (verbose)
 346                         fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n",
 347                                         i,
 348                                         (long)start * DISK_SECTOR_SIZE,
 349                                         (long)(start + len) * DISK_SECTOR_SIZE,
 350                                         (long)len * DISK_SECTOR_SIZE);
 351                 printf("%ld\n", (long)start * DISK_SECTOR_SIZE);
 352                 printf("%ld\n", (long)len * DISK_SECTOR_SIZE);
 353         }
 354
 355         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 356                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 357                 return ret;
 358         }
 359
 360         lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
 361         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 362                 fputs("write failed.\n", stderr);
 363                 goto fail;
 364         }
 365
 366         lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
 367         if (write(fd, pte, sizeof(struct pte) * MBR_ENTRY_MAX) != sizeof(struct pte) * MBR_ENTRY_MAX) {
 368                 fputs("write failed.\n", stderr);
 369                 goto fail;
 370         }
 371         lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
 372         if (write(fd, "\x55\xaa", 2) != 2) {
 373                 fputs("write failed.\n", stderr);
 374                 goto fail;
 375         }
 376
 377         ret = 0;
 378 fail:
 379         close(fd);
 380         return ret;
 381 }
 382
 383 /* check the partition sizes and write the guid partition table */
 384 static int gen_gptable(uint32_t signature, guid_t guid, unsigned nr)
 385 {
 386         struct pte pte[MBR_ENTRY_MAX];
 387         struct gpth gpth = {
 388                 .signature = cpu_to_le64(GPT_SIGNATURE),
 389                 .revision = cpu_to_le32(GPT_REVISION),
 390                 .size = cpu_to_le32(GPT_HEADER_SIZE),
 391                 .self = cpu_to_le64(GPT_HEADER_SECTOR),
 392                 .first_usable = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
 393                 .first_entry = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR),
 394                 .disk_guid = guid,
 395                 .entry_num = cpu_to_le32(GPT_ENTRY_MAX),
 396                 .entry_size = cpu_to_le32(GPT_ENTRY_SIZE),
 397         };
 398         struct gpte  gpte[GPT_ENTRY_MAX];
 399         uint64_t start, end;
 400         uint64_t sect = GPT_SIZE + GPT_FIRST_ENTRY_SECTOR;
 401         int fd, ret = -1;
 402         unsigned i, pmbr = 1;
 403
 404         memset(pte, 0, sizeof(struct pte) * MBR_ENTRY_MAX);
 405         memset(gpte, 0, GPT_ENTRY_SIZE * GPT_ENTRY_MAX);
 406         for (i = 0; i < nr; i++) {
 407                 if (!parts[i].size) {
 408                         if (ignore_null_sized_partition)
 409                                 continue;
 410                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 411                         return ret;
 412                 }
 413                 start = sect;
 414                 if (parts[i].start != 0) {
 415                         if (parts[i].start * 2 < start) {
 416                                 fprintf(stderr, "Invalid start %ld for partition %d!\n",
 417                                         parts[i].start, i);
 418                                 return ret;
 419                         }
 420                         start = parts[i].start * 2;
 421                 } else if (kb_align != 0) {
 422                         start = round_to_kb(start);
 423                 }
 424                 parts[i].actual_start = start;
 425                 gpte[i].start = cpu_to_le64(start);
 426
 427                 sect = start + parts[i].size * 2;
 428                 gpte[i].end = cpu_to_le64(sect -1);
 429                 gpte[i].guid = guid;
 430                 gpte[i].guid.b[sizeof(guid_t) -1] += i + 1;
 431                 gpte[i].type = parts[i].guid;
 432
 433                 if (parts[i].hybrid && pmbr < MBR_ENTRY_MAX) {
 434                         pte[pmbr].active = ((i + 1) == active) ? 0x80 : 0;
 435                         pte[pmbr].type = parts[i].type;
 436                         pte[pmbr].start = cpu_to_le32(start);
 437                         pte[pmbr].length = cpu_to_le32(sect - start);
 438                         to_chs(start, pte[1].chs_start);
 439                         to_chs(sect - 1, pte[1].chs_end);
 440                         pmbr++;
 441                 }
 442                 gpte[i].attr = parts[i].gattr;
 443
 444                 if (parts[i].name)
 445                         init_utf16(parts[i].name, (uint16_t *)gpte[i].name, GPT_ENTRY_NAME_SIZE / sizeof(uint16_t));
 446
 447                 if ((i + 1) == (unsigned)active)
 448                         gpte[i].attr |= GPT_ATTR_LEGACY_BOOT;
 449
 450                 if (parts[i].required)
 451                         gpte[i].attr |= GPT_ATTR_PLAT_REQUIRED;
 452
 453                 if (verbose)
 454                         fprintf(stderr, "Partition %d: start=%" PRIu64 ", end=%" PRIu64 ", size=%"  PRIu64 "\n",
 455                                         i,
 456                                         start * DISK_SECTOR_SIZE, sect * DISK_SECTOR_SIZE,
 457                                         (sect - start) * DISK_SECTOR_SIZE);
 458                 printf("%" PRIu64 "\n", start * DISK_SECTOR_SIZE);
 459                 printf("%" PRIu64 "\n", (sect - start) * DISK_SECTOR_SIZE);
 460         }
 461
 462         if (parts[0].actual_start > GPT_FIRST_ENTRY_SECTOR + GPT_SIZE) {
 463                 gpte[GPT_ENTRY_MAX - 1].start = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_SIZE);
 464                 gpte[GPT_ENTRY_MAX - 1].end = cpu_to_le64(parts[0].actual_start - 1);
 465                 gpte[GPT_ENTRY_MAX - 1].type = GUID_PARTITION_BIOS_BOOT;
 466                 gpte[GPT_ENTRY_MAX - 1].guid = guid;
 467                 gpte[GPT_ENTRY_MAX - 1].guid.b[sizeof(guid_t) -1] += GPT_ENTRY_MAX;
 468         }
 469
 470         end = sect + GPT_SIZE;
 471
 472         pte[0].type = 0xEE;
 473         pte[0].start = cpu_to_le32(GPT_HEADER_SECTOR);
 474         pte[0].length = cpu_to_le32(end - GPT_HEADER_SECTOR);
 475         to_chs(GPT_HEADER_SECTOR, pte[0].chs_start);
 476         to_chs(end, pte[0].chs_end);
 477
 478         gpth.last_usable = cpu_to_le64(end - GPT_SIZE - 1);
 479         gpth.alternate = cpu_to_le64(end);
 480         gpth.entry_crc32 = cpu_to_le32(gpt_crc32(gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX));
 481         gpth.crc32 = cpu_to_le32(gpt_crc32((char *)&gpth, GPT_HEADER_SIZE));
 482
 483         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 484                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 485                 return ret;
 486         }
 487
 488         lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
 489         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 490                 fputs("write failed.\n", stderr);
 491                 goto fail;
 492         }
 493
 494         lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
 495         if (write(fd, pte, sizeof(struct pte) * MBR_ENTRY_MAX) != sizeof(struct pte) * MBR_ENTRY_MAX) {
 496                 fputs("write failed.\n", stderr);
 497                 goto fail;
 498         }
 499
 500         lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
 501         if (write(fd, "\x55\xaa", 2) != 2) {
 502                 fputs("write failed.\n", stderr);
 503                 goto fail;
 504         }
 505
 506         if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
 507                 fputs("write failed.\n", stderr);
 508                 goto fail;
 509         }
 510
 511         lseek(fd, GPT_FIRST_ENTRY_SECTOR * DISK_SECTOR_SIZE, SEEK_SET);
 512         if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
 513                 fputs("write failed.\n", stderr);
 514                 goto fail;
 515         }
 516
 517 #ifdef WANT_ALTERNATE_PTABLE
 518         /* The alternate partition table (We omit it by default) */
 519         swap(gpth.self, gpth.alternate);
 520         gpth.first_entry = cpu_to_le64(end - GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
 521         gpth.crc32 = 0;
 522         gpth.crc32 = cpu_to_le32(gpt_crc32(&gpth, GPT_HEADER_SIZE));
 523
 524         lseek(fd, end * DISK_SECTOR_SIZE - GPT_ENTRY_SIZE * GPT_ENTRY_MAX, SEEK_SET);
 525         if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
 526                 fputs("write failed.\n", stderr);
 527                 goto fail;
 528         }
 529
 530         lseek(fd, end * DISK_SECTOR_SIZE, SEEK_SET);
 531         if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
 532                 fputs("write failed.\n", stderr);
 533                 goto fail;
 534         }
 535         lseek(fd, (end + 1) * DISK_SECTOR_SIZE -1, SEEK_SET);
 536         if (write(fd, "\x00", 1) != 1) {
 537                 fputs("write failed.\n", stderr);
 538                 goto fail;
 539         }
 540 #endif
 541
 542         ret = 0;
 543 fail:
 544         close(fd);
 545         return ret;
 546 }
 547
 548 static void usage(char *prog)
 549 {
 550         fprintf(stderr, "Usage: %s [-v] [-n] [-g] -h <heads> -s <sectors> -o <outputfile>\n"
 551                         "          [-a 0..4] [-l <align kB>] [-G <guid>]\n"
 552                         "          [[-t <type> | -T <GPT part type>] [-r] [-N <name>] -p <size>[@<start>]...] \n", prog);
 553         exit(EXIT_FAILURE);
 554 }
 555
 556 static guid_t type_to_guid_and_name(unsigned char type, char **name)
 557 {
 558         guid_t guid = GUID_PARTITION_BASIC_DATA;
 559
 560         switch (type) {
 561                 case 0xef:
 562                         if(*name == NULL)
 563                                 *name = "EFI System Partition";
 564                         guid = GUID_PARTITION_SYSTEM;
 565                         break;
 566                 case 0x83:
 567                         guid = GUID_PARTITION_LINUX_FS_GUID;
 568                         break;
 569                 case 0x2e:
 570                         guid = GUID_PARTITION_LINUX_FIT_GUID;
 571                         break;
 572         }
 573
 574         return guid;
 575 }
 576
 577 int main (int argc, char **argv)
 578 {
 579         unsigned char type = 0x83;
 580         char *p;
 581         int ch;
 582         int part = 0;
 583         char *name = NULL;
 584         unsigned short int hybrid = 0, required = 0;
 585         uint32_t signature = 0x5452574F; /* 'OWRT' */
 586         guid_t guid = GUID_INIT( signature, 0x2211, 0x4433, \
 587                         0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0x00);
 588
 589         while ((ch = getopt(argc, argv, "h:s:p:a:t:T:o:vnHN:gl:rS:G:")) != -1) {
 590                 switch (ch) {
 591                 case 'o':
 592                         filename = optarg;
 593                         break;
 594                 case 'v':
 595                         verbose++;
 596                         break;
 597                 case 'n':
 598                         ignore_null_sized_partition = true;
 599                         break;
 600                 case 'g':
 601                         use_guid_partition_table = 1;
 602                         break;
 603                 case 'H':
 604                         hybrid = 1;
 605                         break;
 606                 case 'h':
 607                         heads = (int)strtoul(optarg, NULL, 0);
 608                         break;
 609                 case 's':
 610                         sectors = (int)strtoul(optarg, NULL, 0);
 611                         break;
 612                 case 'p':
 613                         if (part > GPT_ENTRY_MAX - 1 || (!use_guid_partition_table && part > 3)) {
 614                                 fputs("Too many partitions\n", stderr);
 615                                 exit(EXIT_FAILURE);
 616                         }
 617                         p = strchr(optarg, '@');
 618                         if (p) {
 619                                 *(p++) = 0;
 620                                 parts[part].start = to_kbytes(p);
 621                         }
 622                         if (!parts[part].has_guid)
 623                                 parts[part].guid = type_to_guid_and_name(type, &name);
 624
 625                         parts[part].size = to_kbytes(optarg);
 626                         parts[part].required = required;
 627                         parts[part].name = name;
 628                         parts[part].hybrid = hybrid;
 629                         fprintf(stderr, "part %ld %ld\n", parts[part].start, parts[part].size);
 630                         parts[part++].type = type;
 631                         /*
 632                          * reset 'name','required' and 'hybrid'
 633                          * 'type' is deliberately inherited from the previous delcaration
 634                          */
 635                         name = NULL;
 636                         required = 0;
 637                         hybrid = 0;
 638                         break;
 639                 case 'N':
 640                         name = optarg;
 641                         break;
 642                 case 'r':
 643                         required = 1;
 644                         break;
 645                 case 't':
 646                         type = (char)strtoul(optarg, NULL, 16);
 647                         break;
 648                 case 'a':
 649                         active = (int)strtoul(optarg, NULL, 0);
 650                         if ((active < 0) || (active > 4))
 651                                 active = 0;
 652                         break;
 653                 case 'l':
 654                         kb_align = (int)strtoul(optarg, NULL, 0) * 2;
 655                         break;
 656                 case 'S':
 657                         signature = strtoul(optarg, NULL, 0);
 658                         break;
 659                 case 'T':
 660                         if (!parse_gpt_parttype(optarg, &parts[part])) {
 661                                 fprintf(stderr,
 662                                         "Invalid GPT partition type \"%s\"\n",
 663                                         optarg);
 664                                 exit(EXIT_FAILURE);
 665                         }
 666                         break;
 667                 case 'G':
 668                         if (guid_parse(optarg, &guid)) {
 669                                 fputs("Invalid guid string\n", stderr);
 670                                 exit(EXIT_FAILURE);
 671                         }
 672                         break;
 673                 case '?':
 674                 default:
 675                         usage(argv[0]);
 676                 }
 677         }
 678         argc -= optind;
 679         if (argc || (!use_guid_partition_table && ((heads <= 0) || (sectors <= 0))) || !filename)
 680                 usage(argv[0]);
 681
 682         if (use_guid_partition_table) {
 683                 heads = 254;
 684                 sectors = 63;
 685                 return gen_gptable(signature, guid, part) ? EXIT_FAILURE : EXIT_SUCCESS;
 686         }
 687
 688         return gen_ptable(signature, part) ? EXIT_FAILURE : EXIT_SUCCESS;
 689 }