gpt.c - chromiumos/third_party/gpt - Git at Google

 /*-
  * Copyright (c) 2002 Marcel Moolenaar
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * CRC32 code derived from work by Gary S. Brown.
  */
 #ifdef LINUX
 #include <sys/mount.h>
 #else
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 #endif

 #include <sys/param.h>
 #include <sys/types.h>
 #ifndef LINUX
 #include <sys/disk.h>
 #endif
 #include <sys/stat.h>

 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>

 #include "map.h"
 #include "gpt.h"

 char	device_path[MAXPATHLEN];
 char	*device_name;

 off_t	mediasz;

 u_int	parts;
 u_int	secsz;

 int	readonly, exclusive = O_EXCL, verbose;

 static uint32_t crc32_tab[] = {
 	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
 	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
 	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
 	0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
 	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,
 	0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
 	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,
 	0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
 	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
 	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
 	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,
 	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
 	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
 	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
 	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
 	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
 	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
 	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
 	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
 	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
 	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
 	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
 	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
 	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
 	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
 	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
 	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
 	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
 	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
 	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
 	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
 	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
 	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
 	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
 	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
 	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
 	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
 	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
 	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
 	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
 	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
 	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
 	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 };

 uint32_t
 crc32(const void *buf, size_t size)
 {
 	const uint8_t *p;
 	uint32_t crc;

 	p = buf;
 	crc = ~0U;

 	while (size--)
 		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);

 	return crc ^ ~0U;
 }

 uint8_t *
 utf16_to_utf8(uint16_t *s16)
 {
 	static uint8_t *s8 = NULL;
 	static size_t s8len = 0;
 	size_t s8idx, s16idx, s16len;
 	uint32_t utfchar;
 	unsigned int c;

 	s16len = 0;
 	while (s16[s16len++] != 0)
 		;
 	if (s8len < s16len * 3) {
 		if (s8 != NULL)
 			free(s8);
 		s8len = s16len * 3;
 		s8 = calloc(s16len, 3);
 	}
 	s8idx = s16idx = 0;
 	while (s16idx < s16len) {
 		utfchar = le16toh(s16[s16idx++]);
 		if ((utfchar & 0xf800) == 0xd800) {
 			c = le16toh(s16[s16idx]);
 			if ((utfchar & 0x400) != 0 || (c & 0xfc00) != 0xdc00)
 				utfchar = 0xfffd;
 			else
 				s16idx++;
 		}
 		if (utfchar < 0x80) {
 			s8[s8idx++] = utfchar;
 		} else if (utfchar < 0x800) {
 			s8[s8idx++] = 0xc0 | (utfchar >> 6);
 			s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 		} else if (utfchar < 0x10000) {
 			s8[s8idx++] = 0xe0 | (utfchar >> 12);
 			s8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
 			s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 		} else if (utfchar < 0x200000) {
 			s8[s8idx++] = 0xf0 | (utfchar >> 18);
 			s8[s8idx++] = 0x80 | ((utfchar >> 12) & 0x3f);
 			s8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
 			s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 		}
 	}
 	return (s8);
 }

 void
 utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len)
 {
 	size_t s16idx, s8idx, s8len;
 	uint32_t utfchar;
 	unsigned int c, utfbytes;

 	s8len = 0;
 	while (s8[s8len++] != 0)
 		;
 	s8idx = s16idx = 0;
 	utfbytes = 0;
 	do {
 		c = s8[s8idx++];
 		if ((c & 0xc0) != 0x80) {
 			/* Initial characters. */
 			if (utfbytes != 0) {
 				/* Incomplete encoding. */
 				s16[s16idx++] = 0xfffd;
 				if (s16idx == s16len) {
 					s16[--s16idx] = 0;
 					return;
 				}
 			}
 			if ((c & 0xf8) == 0xf0) {
 				utfchar = c & 0x07;
 				utfbytes = 3;
 			} else if ((c & 0xf0) == 0xe0) {
 				utfchar = c & 0x0f;
 				utfbytes = 2;
 			} else if ((c & 0xe0) == 0xc0) {
 				utfchar = c & 0x1f;
 				utfbytes = 1;
 			} else {
 				utfchar = c & 0x7f;
 				utfbytes = 0;
 			}
 		} else {
 			/* Followup characters. */
 			if (utfbytes > 0) {
 				utfchar = (utfchar << 6) + (c & 0x3f);
 				utfbytes--;
 			} else if (utfbytes == 0)
 				utfbytes = -1;
 		}
 		if (utfbytes == 0) {
 			if (utfchar >= 0x10000 && s16idx + 2 >= s16len)
 				utfchar = 0xfffd;
 			if (utfchar >= 0x10000) {
 				s16[s16idx++] = 0xd800 | ((utfchar>>10)-0x40);
 				s16[s16idx++] = 0xdc00 | (utfchar & 0x3ff);
 			} else
 				s16[s16idx++] = utfchar;
 			if (s16idx == s16len) {
 				s16[--s16idx] = 0;
 				return;
 			}
 		}
 	} while (c != 0);
 }

 void
 le_uuid_dec(void const *buf, uuid_t *uuid)
 {
 	u_char const *p;
 	int i;

 	p = buf;
 	uuid->time_low = le32dec(p);
 	uuid->time_mid = le16dec(p + 4);
 	uuid->time_hi_and_version = le16dec(p + 6);
 	uuid->clock_seq_hi_and_reserved = p[8];
 	uuid->clock_seq_low = p[9];
 	for (i = 0; i < _UUID_NODE_LEN; i++)
 		uuid->node[i] = p[10 + i];
 }

 void
 le_uuid_enc(void *buf, uuid_t const *uuid)
 {
 	u_char *p;
 	int i;

 	p = buf;
 	le32enc(p, uuid->time_low);
 	le16enc(p + 4, uuid->time_mid);
 	le16enc(p + 6, uuid->time_hi_and_version);
 	p[8] = uuid->clock_seq_hi_and_reserved;
 	p[9] = uuid->clock_seq_low;
 	for (i = 0; i < _UUID_NODE_LEN; i++)
 		p[10 + i] = uuid->node[i];
 }

 int
 parse_uuid(const char *s, uuid_t *uuid)
 {
 	uint32_t status;

 	uuid_from_string(s, uuid, &status);
 	if (status == uuid_s_ok)
 		return (0);

 	switch (*s) {
 	case 'b':
 		if (strcmp(s, "boot") == 0) {
 			uuid_t boot = GPT_ENT_TYPE_FREEBSD_BOOT;
 			*uuid = boot;
 			return (0);
 		}
 		break;
 	case 'e':
 		if (strcmp(s, "efi") == 0) {
 			uuid_t efi = GPT_ENT_TYPE_EFI;
 			*uuid = efi;
 			return (0);
 		}
 		break;
 	case 'h':
 		if (strcmp(s, "hfs") == 0) {
 			uuid_t hfs = GPT_ENT_TYPE_APPLE_HFS;
 			*uuid = hfs;
 			return (0);
 		}
 		break;
 	case 'l':
 		if (strcmp(s, "linux") == 0) {
 			uuid_t lnx = GPT_ENT_TYPE_LINUX_DATA;
 			*uuid = lnx;
 			return (0);
 		}
 		if (strcmp(s, "linux_swap") == 0) {
 			uuid_t lnx = GPT_ENT_TYPE_LINUX_SWAP;
 			*uuid = lnx;
 			return (0);
 		}
 		break;
 	case 's':
 		if (strcmp(s, "swap") == 0) {
 			uuid_t sw = GPT_ENT_TYPE_FREEBSD_SWAP;
 			*uuid = sw;
 			return (0);
 		}
 		break;
 	case 'u':
 		if (strcmp(s, "ufs") == 0) {
 			uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
 			*uuid = ufs;
 			return (0);
 		}
 		break;
 	case 'w':
 		if (strcmp(s, "windows") == 0) {
 			uuid_t win = GPT_ENT_TYPE_MS_BASIC_DATA;
 			*uuid = win;
 			return (0);
 		}
 		break;
 	case 'z':
 		if (strcmp(s, "zfs") == 0) {
 			uuid_t zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
 			*uuid = zfs;
 			return (0);
 		}
 		break;
 	}
 	return (EINVAL);
 }

 void*
 gpt_read(int fd, off_t lba, size_t count)
 {
 	off_t ofs;
 	void *buf;

 	count *= secsz;
 	buf = malloc(count);
 	if (buf == NULL)
 		return (NULL);

 	ofs = lba * secsz;
 	if (lseek(fd, ofs, SEEK_SET) == ofs &&
 	    read(fd, buf, count) == (ssize_t)count)
 		return (buf);

 	free(buf);
 	return (NULL);
 }

 int
 gpt_write(int fd, map_t *map)
 {
 	off_t ofs;
 	size_t count;

 	count = map->map_size * secsz;
 	ofs = map->map_start * secsz;
 	if (lseek(fd, ofs, SEEK_SET) == ofs &&
 	    write(fd, map->map_data, count) == (ssize_t)count)
 		return (0);
 	return (-1);
 }

 static int
 gpt_mbr(int fd, off_t lba)
 {
 	struct mbr *mbr;
 	map_t *m, *p;
 	off_t size, start;
 	unsigned int i, pmbr;

 	mbr = gpt_read(fd, lba, 1);
 	if (mbr == NULL)
 		return (-1);

 	if (mbr->mbr_sig != htole16(MBR_SIG)) {
 		if (verbose)
 			warnx("%s: MBR not found at sector %llu", device_name,
 			    (long long)lba);
 		free(mbr);
 		return (0);
 	}

 	/*
 	 * Differentiate between a regular MBR and a PMBR. This is more
 	 * convenient in general. A PMBR is one with a single partition
 	 * of type 0xee.
 	 */
 	pmbr = 0;
 	for (i = 0; i < 4; i++) {
 		if (mbr->mbr_part[i].part_typ == 0)
 			continue;
 		if (mbr->mbr_part[i].part_typ == 0xee)
 			pmbr++;
 		else
 			break;
 	}
 	if (pmbr && i == 4 && lba == 0) {
 		if (pmbr != 1)
 			warnx("%s: Suspicious PMBR at sector %llu",
 			    device_name, (long long)lba);
 		else if (verbose > 1)
 			warnx("%s: PMBR at sector %llu", device_name,
 			    (long long)lba);
 		p = map_add(lba, 1LL, MAP_TYPE_PMBR, mbr);
 		return ((p == NULL) ? -1 : 0);
 	}
 	if (pmbr)
 		warnx("%s: Suspicious MBR at sector %llu", device_name,
 		    (long long)lba);
 	else if (verbose > 1)
 		warnx("%s: MBR at sector %llu", device_name, (long long)lba);

 	p = map_add(lba, 1LL, MAP_TYPE_MBR, mbr);
 	if (p == NULL)
 		return (-1);
 	for (i = 0; i < 4; i++) {
 		if (mbr->mbr_part[i].part_typ == 0 ||
 		    mbr->mbr_part[i].part_typ == 0xee)
 			continue;
 		start = le16toh(mbr->mbr_part[i].part_start_hi);
 		start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
 		size = le16toh(mbr->mbr_part[i].part_size_hi);
 		size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);
 		if (start == 0 && size == 0) {
 			warnx("%s: Malformed MBR at sector %llu", device_name,
 			    (long long)lba);
 			continue;
 		}
 		/* start is relative to the offset of the MBR itself. */
 		start += lba;
 		if (verbose > 2)
 			warnx("%s: MBR part: type=%d, start=%llu, size=%llu",
 			    device_name, mbr->mbr_part[i].part_typ,
 			    (long long)start, (long long)size);
 		if (mbr->mbr_part[i].part_typ != 15) {
 			m = map_add(start, size, MAP_TYPE_MBR_PART, p);
 			if (m == NULL)
 				return (-1);
 			m->map_index = i + 1;
 		} else {
 			if (gpt_mbr(fd, start) == -1)
 				return (-1);
 		}
 	}
 	return (0);
 }

 static int
 gpt_gpt(int fd, off_t lba)
 {
 	uuid_t type;
 	off_t size;
 	struct gpt_ent *ent;
 	struct gpt_hdr *hdr;
 	char *p, *s;
 	map_t *m;
 	size_t blocks, tblsz;
 	unsigned int i;
 	uint32_t crc;

 	hdr = gpt_read(fd, lba, 1);
 	if (hdr == NULL)
 		return (-1);

 	if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)))
 		goto fail_hdr;

 	crc = le32toh(hdr->hdr_crc_self);
 	hdr->hdr_crc_self = 0;
 	if (crc32(hdr, le32toh(hdr->hdr_size)) != crc) {
 		if (verbose)
 			warnx("%s: Bad CRC in GPT header at sector %llu",
 			    device_name, (long long)lba);
 		goto fail_hdr;
 	}

 	tblsz = le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz);
 	blocks = tblsz / secsz + ((tblsz % secsz) ? 1 : 0);

 	/* Use generic pointer to deal with hdr->hdr_entsz != sizeof(*ent). */
 	p = gpt_read(fd, le64toh(hdr->hdr_lba_table), blocks);
 	if (p == NULL)
 		return (-1);

 	if (crc32(p, tblsz) != le32toh(hdr->hdr_crc_table)) {
 		if (verbose)
 			warnx("%s: Bad CRC in GPT table at sector %llu",
 			    device_name,
 			    (long long)le64toh(hdr->hdr_lba_table));
 		goto fail_ent;
 	}

 	if (verbose > 1)
 		warnx("%s: %s GPT at sector %llu", device_name,
 		    (lba == 1) ? "Pri" : "Sec", (long long)lba);

 	m = map_add(lba, 1, (lba == 1)
 	    ? MAP_TYPE_PRI_GPT_HDR : MAP_TYPE_SEC_GPT_HDR, hdr);
 	if (m == NULL)
 		return (-1);

 	m = map_add(le64toh(hdr->hdr_lba_table), blocks, (lba == 1)
 	    ? MAP_TYPE_PRI_GPT_TBL : MAP_TYPE_SEC_GPT_TBL, p);
 	if (m == NULL)
 		return (-1);

 	if (lba != 1)
 		return (0);

 	for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 		ent = (void*)(p + i * le32toh(hdr->hdr_entsz));
 		if (uuid_is_nil(&ent->ent_type, NULL))
 			continue;

 		size = le64toh(ent->ent_lba_end) - le64toh(ent->ent_lba_start) +
 		    1LL;
 		if (verbose > 2) {
 			le_uuid_dec(&ent->ent_type, &type);
 			uuid_to_string(&type, &s, NULL);
 			warnx(
 	"%s: GPT partition: type=%s, start=%llu, size=%llu", device_name, s,
 			    (long long)le64toh(ent->ent_lba_start),
 			    (long long)size);
 			free(s);
 		}
 		m = map_add(le64toh(ent->ent_lba_start), size,
 		    MAP_TYPE_GPT_PART, ent);
 		if (m == NULL)
 			return (-1);
 		m->map_index = i + 1;
 	}
 	return (0);

  fail_ent:
 	free(p);

  fail_hdr:
 	free(hdr);
 	return (0);
 }

 int
 gpt_open(const char *dev)
 {
 	struct stat sb;
 	int fd, mode;

 	mode = readonly ? O_RDONLY : O_RDWR|exclusive;

 	strlcpy(device_path, dev, sizeof(device_path));
 	device_name = device_path;

 	if ((fd = open(device_path, mode)) != -1)
 		goto found;

 	snprintf(device_path, sizeof(device_path), "%s%s", _PATH_DEV, dev);
 	device_name = device_path + strlen(_PATH_DEV);
 	if ((fd = open(device_path, mode)) != -1)
 		goto found;

 	return (-1);

  found:
 	if (fstat(fd, &sb) == -1)
 		goto close;

 	if ((sb.st_mode & S_IFMT) != S_IFREG) {
 #ifdef LINUX
                 if (ioctl(fd, BLKSSZGET, &secsz) < 0 ||
                     ioctl(fd, BLKGETSIZE64, &mediasz) < 0)
                         goto close;
 #else
 		if (ioctl(fd, DIOCGSECTORSIZE, &secsz) == -1 ||
 		    ioctl(fd, DIOCGMEDIASIZE, &mediasz) == -1)
 			goto close;
 #endif
 	} else {
 		secsz = 512;	/* Fixed size for files. */
 		if (sb.st_size % secsz) {
 			errno = EINVAL;
 			goto close;
 		}
 		mediasz = sb.st_size;
 	}

 	/*
 	 * We require an absolute minimum of 6 sectors. One for the MBR,
 	 * 2 for the GPT header, 2 for the GPT table and one to hold some
 	 * user data. Let's catch this extreme border case here so that
 	 * we don't have to worry about it later.
 	 */
 	if (mediasz / secsz < 6) {
 		errno = ENODEV;
 		goto close;
 	}

 	if (verbose)
 		warnx("%s: mediasize=%llu; sectorsize=%u; blocks=%llu",
 		    device_name, (long long)mediasz, secsz,
 		    (long long)(mediasz / secsz));

 	map_init(mediasz / secsz);

 	if (gpt_mbr(fd, 0LL) == -1)
 		goto close;

 	/*
 	 * Don't look for a GPT unless we have a valid PMBR.
 	 */
 	if (map_find(MAP_TYPE_PMBR) != NULL) {
 		if (gpt_gpt(fd, 1LL) == -1)
 			goto close;
 		if (gpt_gpt(fd, mediasz / secsz - 1LL) == -1)
 			goto close;
 	}

 	return (fd);

  close:
 	close(fd);
 	return (-1);
 }

 void
 gpt_close(int fd)
 {
 	/* XXX post processing? */
 	close(fd);
 }

 static struct {
 	int (*fptr)(int, char *[]);
 	const char *name;
 } cmdsw[] = {
 	{ cmd_add, "add" },
 	{ cmd_boot, "boot" },
 	{ cmd_create, "create" },
 	{ cmd_destroy, "destroy" },
 	{ NULL, "help" },
 	{ cmd_label, "label" },
 #ifndef LINUX
 	{ cmd_migrate, "migrate" },
 #endif
 	{ cmd_recover, "recover" },
 	{ cmd_remove, "remove" },
 	{ NULL, "rename" },
 	{ cmd_show, "show" },
 	{ NULL, "verify" },
 	{ NULL, NULL }
 };

 static void
 usage(void)
 {

 	fprintf(stderr,
 	    "usage: %s [-rSv] [-p nparts] command [options] device ...\n",
 	    getprogname());
 	exit(1);
 }

 static void
 prefix(const char *cmd)
 {
 	char *pfx;
 	const char *prg;

 	prg = getprogname();
 	pfx = malloc(strlen(prg) + strlen(cmd) + 2);
 	/* Don't bother failing. It's not important */
 	if (pfx == NULL)
 		return;

 	sprintf(pfx, "%s %s", prg, cmd);
 	setprogname(pfx);
 }

 int
 main(int argc, char *argv[])
 {
 	char *cmd, *p;
 	int ch, i;

 	/* Get the generic options */
 	while ((ch = getopt(argc, argv, "+p:rSv")) != -1) {
 		switch(ch) {
 		case 'p':
 			if (parts > 0)
 				usage();
 			parts = strtol(optarg, &p, 10);
 			if (*p != 0 || parts < 1)
 				usage();
 			break;
 		case 'r':
 			readonly = 1;
 			break;
 		case 'S':
 			exclusive = 0;
 			break;
 		case 'v':
 			verbose++;
 			break;
 		default:
 			usage();
 		}
 	}
 	if (!parts)
 		parts = 128;

 	if (argc == optind)
 		usage();

 	cmd = argv[optind++];
 	for (i = 0; cmdsw[i].name != NULL && strcmp(cmd, cmdsw[i].name); i++);

 	if (cmdsw[i].fptr == NULL)
 		errx(1, "unknown command: %s", cmd);

 	prefix(cmd);
 	return ((*cmdsw[i].fptr)(argc, argv));
 }
	/*-
	* Copyright (c) 2002 Marcel Moolenaar
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* CRC32 code derived from work by Gary S. Brown.
	*/
	#ifdef LINUX
	#include <sys/mount.h>
	#else
	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");
	#endif

	#include <sys/param.h>
	#include <sys/types.h>
	#ifndef LINUX
	#include <sys/disk.h>
	#endif
	#include <sys/stat.h>

	#include <err.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <paths.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>

	#include "map.h"
	#include "gpt.h"

	char device_path[MAXPATHLEN];
	char *device_name;

	off_t mediasz;

	u_int parts;
	u_int secsz;

	int readonly, exclusive = O_EXCL, verbose;

	static uint32_t crc32_tab[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
	};

	uint32_t
	crc32(const void *buf, size_t size)
	{
	const uint8_t *p;
	uint32_t crc;

	p = buf;
	crc = ~0U;

	while (size--)
	crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);

	return crc ^ ~0U;
	}

	uint8_t *
	utf16_to_utf8(uint16_t *s16)
	{
	static uint8_t *s8 = NULL;
	static size_t s8len = 0;
	size_t s8idx, s16idx, s16len;
	uint32_t utfchar;
	unsigned int c;

	s16len = 0;
	while (s16[s16len++] != 0)
	;
	if (s8len < s16len * 3) {
	if (s8 != NULL)
	free(s8);
	s8len = s16len * 3;
	s8 = calloc(s16len, 3);
	}
	s8idx = s16idx = 0;
	while (s16idx < s16len) {
	utfchar = le16toh(s16[s16idx++]);
	if ((utfchar & 0xf800) == 0xd800) {
	c = le16toh(s16[s16idx]);
	if ((utfchar & 0x400) != 0 \|\| (c & 0xfc00) != 0xdc00)
	utfchar = 0xfffd;
	else
	s16idx++;
	}
	if (utfchar < 0x80) {
	s8[s8idx++] = utfchar;
	} else if (utfchar < 0x800) {
	s8[s8idx++] = 0xc0 \| (utfchar >> 6);
	s8[s8idx++] = 0x80 \| (utfchar & 0x3f);
	} else if (utfchar < 0x10000) {
	s8[s8idx++] = 0xe0 \| (utfchar >> 12);
	s8[s8idx++] = 0x80 \| ((utfchar >> 6) & 0x3f);
	s8[s8idx++] = 0x80 \| (utfchar & 0x3f);
	} else if (utfchar < 0x200000) {
	s8[s8idx++] = 0xf0 \| (utfchar >> 18);
	s8[s8idx++] = 0x80 \| ((utfchar >> 12) & 0x3f);
	s8[s8idx++] = 0x80 \| ((utfchar >> 6) & 0x3f);
	s8[s8idx++] = 0x80 \| (utfchar & 0x3f);
	}
	}
	return (s8);
	}

	void
	utf8_to_utf16(const uint8_t s8, uint16_t s16, size_t s16len)
	{
	size_t s16idx, s8idx, s8len;
	uint32_t utfchar;
	unsigned int c, utfbytes;

	s8len = 0;
	while (s8[s8len++] != 0)
	;
	s8idx = s16idx = 0;
	utfbytes = 0;
	do {
	c = s8[s8idx++];
	if ((c & 0xc0) != 0x80) {
	/* Initial characters. */
	if (utfbytes != 0) {
	/* Incomplete encoding. */
	s16[s16idx++] = 0xfffd;
	if (s16idx == s16len) {
	s16[--s16idx] = 0;
	return;
	}
	}
	if ((c & 0xf8) == 0xf0) {
	utfchar = c & 0x07;
	utfbytes = 3;
	} else if ((c & 0xf0) == 0xe0) {
	utfchar = c & 0x0f;
	utfbytes = 2;
	} else if ((c & 0xe0) == 0xc0) {
	utfchar = c & 0x1f;
	utfbytes = 1;
	} else {
	utfchar = c & 0x7f;
	utfbytes = 0;
	}
	} else {
	/* Followup characters. */
	if (utfbytes > 0) {
	utfchar = (utfchar << 6) + (c & 0x3f);
	utfbytes--;
	} else if (utfbytes == 0)
	utfbytes = -1;
	}
	if (utfbytes == 0) {
	if (utfchar >= 0x10000 && s16idx + 2 >= s16len)
	utfchar = 0xfffd;
	if (utfchar >= 0x10000) {
	s16[s16idx++] = 0xd800 \| ((utfchar>>10)-0x40);
	s16[s16idx++] = 0xdc00 \| (utfchar & 0x3ff);
	} else
	s16[s16idx++] = utfchar;
	if (s16idx == s16len) {
	s16[--s16idx] = 0;
	return;
	}
	}
	} while (c != 0);
	}

	void
	le_uuid_dec(void const buf, uuid_t uuid)
	{
	u_char const *p;
	int i;

	p = buf;
	uuid->time_low = le32dec(p);
	uuid->time_mid = le16dec(p + 4);
	uuid->time_hi_and_version = le16dec(p + 6);
	uuid->clock_seq_hi_and_reserved = p[8];
	uuid->clock_seq_low = p[9];
	for (i = 0; i < _UUID_NODE_LEN; i++)
	uuid->node[i] = p[10 + i];
	}

	void
	le_uuid_enc(void buf, uuid_t const uuid)
	{
	u_char *p;
	int i;

	p = buf;
	le32enc(p, uuid->time_low);
	le16enc(p + 4, uuid->time_mid);
	le16enc(p + 6, uuid->time_hi_and_version);
	p[8] = uuid->clock_seq_hi_and_reserved;
	p[9] = uuid->clock_seq_low;
	for (i = 0; i < _UUID_NODE_LEN; i++)
	p[10 + i] = uuid->node[i];
	}

	int
	parse_uuid(const char s, uuid_t uuid)
	{
	uint32_t status;

	uuid_from_string(s, uuid, &status);
	if (status == uuid_s_ok)
	return (0);

	switch (*s) {
	case 'b':
	if (strcmp(s, "boot") == 0) {
	uuid_t boot = GPT_ENT_TYPE_FREEBSD_BOOT;
	*uuid = boot;
	return (0);
	}
	break;
	case 'e':
	if (strcmp(s, "efi") == 0) {
	uuid_t efi = GPT_ENT_TYPE_EFI;
	*uuid = efi;
	return (0);
	}
	break;
	case 'h':
	if (strcmp(s, "hfs") == 0) {
	uuid_t hfs = GPT_ENT_TYPE_APPLE_HFS;
	*uuid = hfs;
	return (0);
	}
	break;
	case 'l':
	if (strcmp(s, "linux") == 0) {
	uuid_t lnx = GPT_ENT_TYPE_LINUX_DATA;
	*uuid = lnx;
	return (0);
	}
	if (strcmp(s, "linux_swap") == 0) {
	uuid_t lnx = GPT_ENT_TYPE_LINUX_SWAP;
	*uuid = lnx;
	return (0);
	}
	break;
	case 's':
	if (strcmp(s, "swap") == 0) {
	uuid_t sw = GPT_ENT_TYPE_FREEBSD_SWAP;
	*uuid = sw;
	return (0);
	}
	break;
	case 'u':
	if (strcmp(s, "ufs") == 0) {
	uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
	*uuid = ufs;
	return (0);
	}
	break;
	case 'w':
	if (strcmp(s, "windows") == 0) {
	uuid_t win = GPT_ENT_TYPE_MS_BASIC_DATA;
	*uuid = win;
	return (0);
	}
	break;
	case 'z':
	if (strcmp(s, "zfs") == 0) {
	uuid_t zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
	*uuid = zfs;
	return (0);
	}
	break;
	}
	return (EINVAL);
	}

	void*
	gpt_read(int fd, off_t lba, size_t count)
	{
	off_t ofs;
	void *buf;

	count *= secsz;
	buf = malloc(count);
	if (buf == NULL)
	return (NULL);

	ofs = lba * secsz;
	if (lseek(fd, ofs, SEEK_SET) == ofs &&
	read(fd, buf, count) == (ssize_t)count)
	return (buf);

	free(buf);
	return (NULL);
	}

	int
	gpt_write(int fd, map_t *map)
	{
	off_t ofs;
	size_t count;

	count = map->map_size * secsz;
	ofs = map->map_start * secsz;
	if (lseek(fd, ofs, SEEK_SET) == ofs &&
	write(fd, map->map_data, count) == (ssize_t)count)
	return (0);
	return (-1);
	}

	static int
	gpt_mbr(int fd, off_t lba)
	{
	struct mbr *mbr;
	map_t m, p;
	off_t size, start;
	unsigned int i, pmbr;

	mbr = gpt_read(fd, lba, 1);
	if (mbr == NULL)
	return (-1);

	if (mbr->mbr_sig != htole16(MBR_SIG)) {
	if (verbose)
	warnx("%s: MBR not found at sector %llu", device_name,
	(long long)lba);
	free(mbr);
	return (0);
	}

	/*
	* Differentiate between a regular MBR and a PMBR. This is more
	* convenient in general. A PMBR is one with a single partition
	* of type 0xee.
	*/
	pmbr = 0;
	for (i = 0; i < 4; i++) {
	if (mbr->mbr_part[i].part_typ == 0)
	continue;
	if (mbr->mbr_part[i].part_typ == 0xee)
	pmbr++;
	else
	break;
	}
	if (pmbr && i == 4 && lba == 0) {
	if (pmbr != 1)
	warnx("%s: Suspicious PMBR at sector %llu",
	device_name, (long long)lba);
	else if (verbose > 1)
	warnx("%s: PMBR at sector %llu", device_name,
	(long long)lba);
	p = map_add(lba, 1LL, MAP_TYPE_PMBR, mbr);
	return ((p == NULL) ? -1 : 0);
	}
	if (pmbr)
	warnx("%s: Suspicious MBR at sector %llu", device_name,
	(long long)lba);
	else if (verbose > 1)
	warnx("%s: MBR at sector %llu", device_name, (long long)lba);

	p = map_add(lba, 1LL, MAP_TYPE_MBR, mbr);
	if (p == NULL)
	return (-1);
	for (i = 0; i < 4; i++) {
	if (mbr->mbr_part[i].part_typ == 0 \|\|
	mbr->mbr_part[i].part_typ == 0xee)
	continue;
	start = le16toh(mbr->mbr_part[i].part_start_hi);
	start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
	size = le16toh(mbr->mbr_part[i].part_size_hi);
	size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);
	if (start == 0 && size == 0) {
	warnx("%s: Malformed MBR at sector %llu", device_name,
	(long long)lba);
	continue;
	}
	/* start is relative to the offset of the MBR itself. */
	start += lba;
	if (verbose > 2)
	warnx("%s: MBR part: type=%d, start=%llu, size=%llu",
	device_name, mbr->mbr_part[i].part_typ,
	(long long)start, (long long)size);
	if (mbr->mbr_part[i].part_typ != 15) {
	m = map_add(start, size, MAP_TYPE_MBR_PART, p);
	if (m == NULL)
	return (-1);
	m->map_index = i + 1;
	} else {
	if (gpt_mbr(fd, start) == -1)
	return (-1);
	}
	}
	return (0);
	}

	static int
	gpt_gpt(int fd, off_t lba)
	{
	uuid_t type;
	off_t size;
	struct gpt_ent *ent;
	struct gpt_hdr *hdr;
	char p, s;
	map_t *m;
	size_t blocks, tblsz;
	unsigned int i;
	uint32_t crc;

	hdr = gpt_read(fd, lba, 1);
	if (hdr == NULL)
	return (-1);

	if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)))
	goto fail_hdr;

	crc = le32toh(hdr->hdr_crc_self);
	hdr->hdr_crc_self = 0;
	if (crc32(hdr, le32toh(hdr->hdr_size)) != crc) {
	if (verbose)
	warnx("%s: Bad CRC in GPT header at sector %llu",
	device_name, (long long)lba);
	goto fail_hdr;
	}

	tblsz = le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz);
	blocks = tblsz / secsz + ((tblsz % secsz) ? 1 : 0);

	/* Use generic pointer to deal with hdr->hdr_entsz != sizeof(ent). /
	p = gpt_read(fd, le64toh(hdr->hdr_lba_table), blocks);
	if (p == NULL)
	return (-1);

	if (crc32(p, tblsz) != le32toh(hdr->hdr_crc_table)) {
	if (verbose)
	warnx("%s: Bad CRC in GPT table at sector %llu",
	device_name,
	(long long)le64toh(hdr->hdr_lba_table));
	goto fail_ent;
	}

	if (verbose > 1)
	warnx("%s: %s GPT at sector %llu", device_name,
	(lba == 1) ? "Pri" : "Sec", (long long)lba);

	m = map_add(lba, 1, (lba == 1)
	? MAP_TYPE_PRI_GPT_HDR : MAP_TYPE_SEC_GPT_HDR, hdr);
	if (m == NULL)
	return (-1);

	m = map_add(le64toh(hdr->hdr_lba_table), blocks, (lba == 1)
	? MAP_TYPE_PRI_GPT_TBL : MAP_TYPE_SEC_GPT_TBL, p);
	if (m == NULL)
	return (-1);

	if (lba != 1)
	return (0);

	for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
	ent = (void)(p + i le32toh(hdr->hdr_entsz));
	if (uuid_is_nil(&ent->ent_type, NULL))
	continue;

	size = le64toh(ent->ent_lba_end) - le64toh(ent->ent_lba_start) +
	1LL;
	if (verbose > 2) {
	le_uuid_dec(&ent->ent_type, &type);
	uuid_to_string(&type, &s, NULL);
	warnx(
	"%s: GPT partition: type=%s, start=%llu, size=%llu", device_name, s,
	(long long)le64toh(ent->ent_lba_start),
	(long long)size);
	free(s);
	}
	m = map_add(le64toh(ent->ent_lba_start), size,
	MAP_TYPE_GPT_PART, ent);
	if (m == NULL)
	return (-1);
	m->map_index = i + 1;
	}
	return (0);

	fail_ent:
	free(p);

	fail_hdr:
	free(hdr);
	return (0);
	}

	int
	gpt_open(const char *dev)
	{
	struct stat sb;
	int fd, mode;

	mode = readonly ? O_RDONLY : O_RDWR\|exclusive;

	strlcpy(device_path, dev, sizeof(device_path));
	device_name = device_path;

	if ((fd = open(device_path, mode)) != -1)
	goto found;

	snprintf(device_path, sizeof(device_path), "%s%s", _PATH_DEV, dev);
	device_name = device_path + strlen(_PATH_DEV);
	if ((fd = open(device_path, mode)) != -1)
	goto found;

	return (-1);

	found:
	if (fstat(fd, &sb) == -1)
	goto close;

	if ((sb.st_mode & S_IFMT) != S_IFREG) {
	#ifdef LINUX
	if (ioctl(fd, BLKSSZGET, &secsz) < 0 \|\|
	ioctl(fd, BLKGETSIZE64, &mediasz) < 0)
	goto close;
	#else
	if (ioctl(fd, DIOCGSECTORSIZE, &secsz) == -1 \|\|
	ioctl(fd, DIOCGMEDIASIZE, &mediasz) == -1)
	goto close;
	#endif
	} else {
	secsz = 512; /* Fixed size for files. */
	if (sb.st_size % secsz) {
	errno = EINVAL;
	goto close;
	}
	mediasz = sb.st_size;
	}

	/*
	* We require an absolute minimum of 6 sectors. One for the MBR,
	* 2 for the GPT header, 2 for the GPT table and one to hold some
	* user data. Let's catch this extreme border case here so that
	* we don't have to worry about it later.
	*/
	if (mediasz / secsz < 6) {
	errno = ENODEV;
	goto close;
	}

	if (verbose)
	warnx("%s: mediasize=%llu; sectorsize=%u; blocks=%llu",
	device_name, (long long)mediasz, secsz,
	(long long)(mediasz / secsz));

	map_init(mediasz / secsz);

	if (gpt_mbr(fd, 0LL) == -1)
	goto close;

	/*
	* Don't look for a GPT unless we have a valid PMBR.
	*/
	if (map_find(MAP_TYPE_PMBR) != NULL) {
	if (gpt_gpt(fd, 1LL) == -1)
	goto close;
	if (gpt_gpt(fd, mediasz / secsz - 1LL) == -1)
	goto close;
	}

	return (fd);

	close:
	close(fd);
	return (-1);
	}

	void
	gpt_close(int fd)
	{
	/* XXX post processing? */
	close(fd);
	}

	static struct {
	int (fptr)(int, char []);
	const char *name;
	} cmdsw[] = {
	{ cmd_add, "add" },
	{ cmd_boot, "boot" },
	{ cmd_create, "create" },
	{ cmd_destroy, "destroy" },
	{ NULL, "help" },
	{ cmd_label, "label" },
	#ifndef LINUX
	{ cmd_migrate, "migrate" },
	#endif
	{ cmd_recover, "recover" },
	{ cmd_remove, "remove" },
	{ NULL, "rename" },
	{ cmd_show, "show" },
	{ NULL, "verify" },
	{ NULL, NULL }
	};

	static void
	usage(void)
	{

	fprintf(stderr,
	"usage: %s [-rSv] [-p nparts] command [options] device ...\n",
	getprogname());
	exit(1);
	}

	static void
	prefix(const char *cmd)
	{
	char *pfx;
	const char *prg;

	prg = getprogname();
	pfx = malloc(strlen(prg) + strlen(cmd) + 2);
	/* Don't bother failing. It's not important */
	if (pfx == NULL)
	return;

	sprintf(pfx, "%s %s", prg, cmd);
	setprogname(pfx);
	}

	int
	main(int argc, char *argv[])
	{
	char cmd, p;
	int ch, i;

	/* Get the generic options */
	while ((ch = getopt(argc, argv, "+p:rSv")) != -1) {
	switch(ch) {
	case 'p':
	if (parts > 0)
	usage();
	parts = strtol(optarg, &p, 10);
	if (*p != 0 \|\| parts < 1)
	usage();
	break;
	case 'r':
	readonly = 1;
	break;
	case 'S':
	exclusive = 0;
	break;
	case 'v':
	verbose++;
	break;
	default:
	usage();
	}
	}
	if (!parts)
	parts = 128;

	if (argc == optind)
	usage();

	cmd = argv[optind++];
	for (i = 0; cmdsw[i].name != NULL && strcmp(cmd, cmdsw[i].name); i++);

	if (cmdsw[i].fptr == NULL)
	errx(1, "unknown command: %s", cmd);

	prefix(cmd);
	return ((*cmdsw[i].fptr)(argc, argv));
	}