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OpenCellular/cgpt/cgpt_common.c
Bill Richardson f1372d9109 Nearly complete rewrite of cgpt tool. 
This fixes a number of bugs, adds a bunch of commands, and essentially makes
cgpt ready to use as a replacement for gpt. Still to do is to add commands
and options that will let it generated intentionally bad partitions, for use
in testing.

Review URL: http://codereview.chromium.org/2719008
2010-06-11 09:15:55 -07:00

727 lines
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/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Utility for ChromeOS-specific GPT partitions, Please see corresponding .c
* files for more details.
*/
#include "cgpt.h"
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include <stdarg.h>
#include "cgptlib_internal.h"
#include "crc32.h"
void Error(const char *format, ...) {
va_list ap;
va_start(ap, format);
fprintf(stderr, "ERROR: %s %s: ", progname, command);
vfprintf(stderr, format, ap);
va_end(ap);
}
int CheckValid(const struct drive *drive) {
if ((drive->gpt.valid_headers != MASK_BOTH) ||
(drive->gpt.valid_entries != MASK_BOTH)) {
fprintf(stderr, "\nWARNING: one of the GPT header/entries is invalid, "
"please run '%s repair'\n", progname);
return CGPT_FAILED;
}
return CGPT_OK;
}
/* Loads sectors from 'fd'.
* *buf is pointed to an allocated memory when returned, and should be
* freed by cgpt_close().
*
* fd -- file descriptot.
* buf -- pointer to buffer pointer
* sector -- offset of starting sector (in sectors)
* sector_bytes -- bytes per sector
* sector_count -- number of sectors to load
*
* Returns CGPT_OK for successful. Aborts if any error occurs.
*/
static int Load(const int fd, uint8_t **buf,
const uint64_t sector,
const uint64_t sector_bytes,
const uint64_t sector_count) {
int count; /* byte count to read */
int nread;
assert(buf);
count = sector_bytes * sector_count;
*buf = malloc(count);
assert(*buf);
if (-1 == lseek(fd, sector * sector_bytes, SEEK_SET))
goto error_free;
nread = read(fd, *buf, count);
if (nread < count)
goto error_free;
return CGPT_OK;
error_free:
free(*buf);
*buf = 0;
return CGPT_FAILED;
}
int ReadPMBR(struct drive *drive) {
if (-1 == lseek(drive->fd, 0, SEEK_SET))
return CGPT_FAILED;
int nread = read(drive->fd, &drive->pmbr, sizeof(struct pmbr));
if (nread != sizeof(struct pmbr))
return CGPT_FAILED;
return CGPT_OK;
}
int WritePMBR(struct drive *drive) {
if (-1 == lseek(drive->fd, 0, SEEK_SET))
return CGPT_FAILED;
int nwrote = write(drive->fd, &drive->pmbr, sizeof(struct pmbr));
if (nwrote != sizeof(struct pmbr))
return CGPT_FAILED;
return CGPT_OK;
}
/* Saves sectors to 'fd'.
*
* fd -- file descriptot.
* buf -- pointer to buffer
* sector -- starting sector offset
* sector_bytes -- bytes per sector
* sector_count -- number of sector to save
*
* Returns CGPT_OK for successful, CGPT_FAILED for failed.
*/
static int Save(const int fd, const uint8_t *buf,
const uint64_t sector,
const uint64_t sector_bytes,
const uint64_t sector_count) {
int count; /* byte count to write */
int nwrote;
assert(buf);
count = sector_bytes * sector_count;
if (-1 == lseek(fd, sector * sector_bytes, SEEK_SET))
return CGPT_FAILED;
nwrote = write(fd, buf, count);
if (nwrote < count)
return CGPT_FAILED;
return CGPT_OK;
}
// Opens a block device or file, loads raw GPT data from it.
//
// Returns CGPT_FAILED if any error happens.
// Returns CGPT_OK if success and information are stored in 'drive'. */
int DriveOpen(const char *drive_path, struct drive *drive) {
struct stat stat;
assert(drive_path);
assert(drive);
// Clear struct for proper error handling.
memset(drive, 0, sizeof(struct drive));
drive->fd = open(drive_path, O_RDWR | O_LARGEFILE);
if (drive->fd == -1) {
Error("Can't open %s: %s\n", drive_path, strerror(errno));
return CGPT_FAILED;
}
if (fstat(drive->fd, &stat) == -1) {
goto error_close;
}
if ((stat.st_mode & S_IFMT) != S_IFREG) {
if (ioctl(drive->fd, BLKGETSIZE64, &drive->size) < 0) {
Error("Can't read drive size from %s: %s\n", drive_path, strerror(errno));
goto error_close;
}
if (ioctl(drive->fd, BLKSSZGET, &drive->gpt.sector_bytes) < 0) {
Error("Can't read sector size from %s: %s\n",
drive_path, strerror(errno));
goto error_close;
}
} else {
drive->gpt.sector_bytes = 512; /* bytes */
drive->size = stat.st_size;
}
if (drive->size % drive->gpt.sector_bytes) {
Error("Media size (%llu) is not a multiple of sector size(%d)\n",
(long long unsigned int)drive->size, drive->gpt.sector_bytes);
goto error_close;
}
drive->gpt.drive_sectors = drive->size / drive->gpt.sector_bytes;
// Read the data.
if (CGPT_OK != Load(drive->fd, &drive->gpt.primary_header,
GPT_PMBR_SECTOR,
drive->gpt.sector_bytes, GPT_HEADER_SECTOR)) {
goto error_close;
}
if (CGPT_OK != Load(drive->fd, &drive->gpt.secondary_header,
drive->gpt.drive_sectors - GPT_PMBR_SECTOR,
drive->gpt.sector_bytes, GPT_HEADER_SECTOR)) {
goto error_close;
}
if (CGPT_OK != Load(drive->fd, &drive->gpt.primary_entries,
GPT_PMBR_SECTOR + GPT_HEADER_SECTOR,
drive->gpt.sector_bytes, GPT_ENTRIES_SECTORS)) {
goto error_close;
}
if (CGPT_OK != Load(drive->fd, &drive->gpt.secondary_entries,
drive->gpt.drive_sectors - GPT_HEADER_SECTOR
- GPT_ENTRIES_SECTORS,
drive->gpt.sector_bytes, GPT_ENTRIES_SECTORS)) {
goto error_close;
}
// We just load the data. Caller must validate it.
return CGPT_OK;
error_close:
(void) DriveClose(drive, 0);
return CGPT_FAILED;
}
int DriveClose(struct drive *drive, int update_as_needed) {
int errors = 0;
if (update_as_needed) {
if (drive->gpt.modified & GPT_MODIFIED_HEADER1) {
if (CGPT_OK != Save(drive->fd, drive->gpt.primary_header,
GPT_PMBR_SECTOR,
drive->gpt.sector_bytes, GPT_HEADER_SECTOR)) {
errors++;
Error("Cannot write primary header: %s\n", strerror(errno));
}
}
if (drive->gpt.modified & GPT_MODIFIED_HEADER2) {
if(CGPT_OK != Save(drive->fd, drive->gpt.secondary_header,
drive->gpt.drive_sectors - GPT_PMBR_SECTOR,
drive->gpt.sector_bytes, GPT_HEADER_SECTOR)) {
errors++;
Error("Cannot write secondary header: %s\n", strerror(errno));
}
}
if (drive->gpt.modified & GPT_MODIFIED_ENTRIES1) {
if (CGPT_OK != Save(drive->fd, drive->gpt.primary_entries,
GPT_PMBR_SECTOR + GPT_HEADER_SECTOR,
drive->gpt.sector_bytes, GPT_ENTRIES_SECTORS)) {
errors++;
Error("Cannot write primary entries: %s\n", strerror(errno));
}
}
if (drive->gpt.modified & GPT_MODIFIED_ENTRIES2) {
if (CGPT_OK != Save(drive->fd, drive->gpt.secondary_entries,
drive->gpt.drive_sectors - GPT_HEADER_SECTOR
- GPT_ENTRIES_SECTORS,
drive->gpt.sector_bytes, GPT_ENTRIES_SECTORS)) {
errors++;
Error("Cannot write secondary entries: %s\n", strerror(errno));
}
}
}
close(drive->fd);
if (drive->gpt.primary_header)
free(drive->gpt.primary_header);
drive->gpt.primary_header = 0;
if (drive->gpt.primary_entries)
free(drive->gpt.primary_entries);
drive->gpt.primary_entries = 0;
if (drive->gpt.secondary_header)
free(drive->gpt.secondary_header);
drive->gpt.secondary_header = 0;
if (drive->gpt.secondary_entries)
free(drive->gpt.secondary_entries);
drive->gpt.secondary_entries = 0;
return errors ? CGPT_FAILED : CGPT_OK;
}
/* GUID conversion functions. Accepted format:
*
* "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
*
* Returns CGPT_OK if parsing is successful; otherwise CGPT_FAILED.
*/
int StrToGuid(const char *str, Guid *guid) {
uint32_t time_low;
uint16_t time_mid;
uint16_t time_high_and_version;
unsigned int chunk[11];
if (11 != sscanf(str, "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
chunk+0,
chunk+1,
chunk+2,
chunk+3,
chunk+4,
chunk+5,
chunk+6,
chunk+7,
chunk+8,
chunk+9,
chunk+10)) {
printf("FAILED\n");
return CGPT_FAILED;
}
time_low = chunk[0] & 0xffffffff;
time_mid = chunk[1] & 0xffff;
time_high_and_version = chunk[2] & 0xffff;
guid->u.Uuid.time_low = htole32(time_low);
guid->u.Uuid.time_mid = htole16(time_mid);
guid->u.Uuid.time_high_and_version = htole16(time_high_and_version);
guid->u.Uuid.clock_seq_high_and_reserved = chunk[3] & 0xff;
guid->u.Uuid.clock_seq_low = chunk[4] & 0xff;
guid->u.Uuid.node[0] = chunk[5] & 0xff;
guid->u.Uuid.node[1] = chunk[6] & 0xff;
guid->u.Uuid.node[2] = chunk[7] & 0xff;
guid->u.Uuid.node[3] = chunk[8] & 0xff;
guid->u.Uuid.node[4] = chunk[9] & 0xff;
guid->u.Uuid.node[5] = chunk[10] & 0xff;
return CGPT_OK;
}
void GuidToStr(const Guid *guid, char *str) {
sprintf(str, "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
le32toh(guid->u.Uuid.time_low), le16toh(guid->u.Uuid.time_mid),
le16toh(guid->u.Uuid.time_high_and_version),
guid->u.Uuid.clock_seq_high_and_reserved, guid->u.Uuid.clock_seq_low,
guid->u.Uuid.node[0], guid->u.Uuid.node[1], guid->u.Uuid.node[2],
guid->u.Uuid.node[3], guid->u.Uuid.node[4], guid->u.Uuid.node[5]);
}
/* Convert UTF16 string to UTF8. Rewritten from gpt utility.
* Caller must prepare enough space for UTF8. The rough estimation is:
*
* utf8 length = bytecount(utf16) * 1.5
*/
#define SIZEOF_GPTENTRY_NAME 36 /* sizeof(GptEntry.name[]) */
void UTF16ToUTF8(const uint16_t *utf16, uint8_t *utf8)
{
size_t s8idx, s16idx, s16len;
uint32_t utfchar;
unsigned int next_utf16;
for (s16len = 0; s16len < SIZEOF_GPTENTRY_NAME && utf16[s16len]; ++s16len);
*utf8 = s8idx = s16idx = 0;
while (s16idx < s16len) {
utfchar = le16toh(utf16[s16idx++]);
if ((utfchar & 0xf800) == 0xd800) {
next_utf16 = le16toh(utf16[s16idx]);
if ((utfchar & 0x400) != 0 || (next_utf16 & 0xfc00) != 0xdc00)
utfchar = 0xfffd;
else
s16idx++;
}
if (utfchar < 0x80) {
utf8[s8idx++] = utfchar;
} else if (utfchar < 0x800) {
utf8[s8idx++] = 0xc0 | (utfchar >> 6);
utf8[s8idx++] = 0x80 | (utfchar & 0x3f);
} else if (utfchar < 0x10000) {
utf8[s8idx++] = 0xe0 | (utfchar >> 12);
utf8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
utf8[s8idx++] = 0x80 | (utfchar & 0x3f);
} else if (utfchar < 0x200000) {
utf8[s8idx++] = 0xf0 | (utfchar >> 18);
utf8[s8idx++] = 0x80 | ((utfchar >> 12) & 0x3f);
utf8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
utf8[s8idx++] = 0x80 | (utfchar & 0x3f);
}
}
utf8[s8idx++] = 0;
}
/* Convert UTF8 string to UTF16. Rewritten from gpt utility.
* Caller must prepare enough space for UTF16. The conservative estimation is:
*
* utf16 bytecount = bytecount(utf8) / 3 * 4
*/
void UTF8ToUTF16(const uint8_t *utf8, uint16_t *utf16)
{
size_t s16idx, s8idx, s8len;
uint32_t utfchar;
unsigned int c, utfbytes;
for (s8len = 0; utf8[s8len]; ++s8len);
s8idx = s16idx = 0;
utfbytes = 0;
do {
c = utf8[s8idx++];
if ((c & 0xc0) != 0x80) {
/* Initial characters. */
if (utfbytes != 0) {
/* Incomplete encoding. */
utf16[s16idx++] = 0xfffd;
}
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;
utfchar = 0xfffd;
}
if (utfbytes == 0) {
if (utfchar >= 0x10000) {
utf16[s16idx++] = htole16(0xd800 | ((utfchar>>10)-0x40));
if (s16idx >= SIZEOF_GPTENTRY_NAME) break;
utf16[s16idx++] = htole16(0xdc00 | (utfchar & 0x3ff));
} else {
utf16[s16idx++] = htole16(utfchar);
}
}
} while (c != 0 && s16idx < SIZEOF_GPTENTRY_NAME);
if (s16idx < SIZEOF_GPTENTRY_NAME)
utf16[s16idx++] = 0;
}
struct {
Guid type;
char *name;
char *description;
} supported_types[] = {
{GPT_ENT_TYPE_CHROMEOS_KERNEL, "kernel", "ChromeOS kernel"},
{GPT_ENT_TYPE_CHROMEOS_ROOTFS, "rootfs", "ChromeOS rootfs"},
{GPT_ENT_TYPE_LINUX_DATA, "data", "Linux data"},
{GPT_ENT_TYPE_CHROMEOS_RESERVED, "reserved", "ChromeOS reserved"},
{GPT_ENT_TYPE_EFI, "efi", "EFI System Partition"},
{GPT_ENT_TYPE_UNUSED, "unused", "Unused (nonexistent) partition"},
};
/* Resolves human-readable GPT type.
* Returns CGPT_OK if found.
* Returns CGPT_FAILED if no known type found. */
int ResolveType(const Guid *type, char *buf) {
int i;
for (i = 0; i < ARRAY_COUNT(supported_types); ++i) {
if (!memcmp(type, &supported_types[i].type, sizeof(Guid))) {
strcpy(buf, supported_types[i].description);
return CGPT_OK;
}
}
return CGPT_FAILED;
}
int SupportedType(const char *name, Guid *type) {
int i;
for (i = 0; i < ARRAY_COUNT(supported_types); ++i) {
if (!strcmp(name, supported_types[i].name)) {
memcpy(type, &supported_types[i].type, sizeof(Guid));
return CGPT_OK;
}
}
return CGPT_FAILED;
}
void PrintTypes(void) {
int i;
printf("The partition type may also be given as one of these aliases:\n\n");
for (i = 0; i < ARRAY_COUNT(supported_types); ++i) {
printf(" %-10s %s\n", supported_types[i].name,
supported_types[i].description);
}
printf("\n");
}
uint32_t GetNumberOfEntries(const GptData *gpt) {
GptHeader *header = 0;
if (gpt->valid_headers & MASK_PRIMARY)
header = (GptHeader*)gpt->primary_header;
else if (gpt->valid_headers & MASK_SECONDARY)
header = (GptHeader*)gpt->secondary_header;
else
return 0;
return header->number_of_entries;
}
static uint32_t GetSizeOfEntries(const GptData *gpt) {
GptHeader *header = 0;
if (gpt->valid_headers & MASK_PRIMARY)
header = (GptHeader*)gpt->primary_header;
else if (gpt->valid_headers & MASK_SECONDARY)
header = (GptHeader*)gpt->secondary_header;
else
return 0;
return header->number_of_entries;
}
GptEntry *GetEntry(GptData *gpt, int secondary, int entry_index) {
uint8_t *entries;
int stride = GetSizeOfEntries(gpt);
if (!stride)
return 0;
if (secondary == PRIMARY) {
entries = gpt->primary_entries;
} else {
entries = gpt->secondary_entries;
}
return (GptEntry*)(&entries[stride * entry_index]);
}
void SetPriority(GptData *gpt, int secondary, int entry_index, int priority) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
assert(priority >= 0 && priority <= CGPT_ATTRIBUTE_MAX_PRIORITY);
entry->attributes &= ~CGPT_ATTRIBUTE_PRIORITY_MASK;
entry->attributes |= (uint64_t)priority << CGPT_ATTRIBUTE_PRIORITY_OFFSET;
}
int GetPriority(GptData *gpt, int secondary, int entry_index) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
return (entry->attributes & CGPT_ATTRIBUTE_PRIORITY_MASK) >>
CGPT_ATTRIBUTE_PRIORITY_OFFSET;
}
void SetTries(GptData *gpt, int secondary, int entry_index, int tries) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
assert(tries >= 0 && tries <= CGPT_ATTRIBUTE_MAX_TRIES);
entry->attributes &= ~CGPT_ATTRIBUTE_TRIES_MASK;
entry->attributes |= (uint64_t)tries << CGPT_ATTRIBUTE_TRIES_OFFSET;
}
int GetTries(GptData *gpt, int secondary, int entry_index) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
return (entry->attributes & CGPT_ATTRIBUTE_TRIES_MASK) >>
CGPT_ATTRIBUTE_TRIES_OFFSET;
}
void SetSuccessful(GptData *gpt, int secondary, int entry_index, int success) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
assert(success >= 0 && success <= CGPT_ATTRIBUTE_MAX_SUCCESSFUL);
entry->attributes &= ~CGPT_ATTRIBUTE_SUCCESSFUL_MASK;
entry->attributes |= (uint64_t)success << CGPT_ATTRIBUTE_SUCCESSFUL_OFFSET;
}
int GetSuccessful(GptData *gpt, int secondary, int entry_index) {
GptEntry *entry;
entry = GetEntry(gpt, secondary, entry_index);
return (entry->attributes & CGPT_ATTRIBUTE_SUCCESSFUL_MASK) >>
CGPT_ATTRIBUTE_SUCCESSFUL_OFFSET;
}
#define TOSTRING(A) #A
const char *GptError(int errnum) {
const char *error_string[] = {
TOSTRING(GPT_SUCCESS),
TOSTRING(GPT_ERROR_NO_VALID_KERNEL),
TOSTRING(GPT_ERROR_INVALID_HEADERS),
TOSTRING(GPT_ERROR_INVALID_ENTRIES),
TOSTRING(GPT_ERROR_INVALID_SECTOR_SIZE),
TOSTRING(GPT_ERROR_INVALID_SECTOR_NUMBER),
TOSTRING(GPT_ERROR_INVALID_UPDATE_TYPE)
};
if (errnum < 0 || errnum >= ARRAY_COUNT(error_string))
return "<illegal value>";
return error_string[errnum];
}
/* Update CRC value if necessary. */
void UpdateCrc(GptData *gpt) {
GptHeader *primary_header, *secondary_header;
primary_header = (GptHeader*)gpt->primary_header;
secondary_header = (GptHeader*)gpt->secondary_header;
if (gpt->modified & GPT_MODIFIED_ENTRIES1) {
primary_header->entries_crc32 =
Crc32(gpt->primary_entries, TOTAL_ENTRIES_SIZE);
}
if (gpt->modified & GPT_MODIFIED_ENTRIES2) {
secondary_header->entries_crc32 =
Crc32(gpt->secondary_entries, TOTAL_ENTRIES_SIZE);
}
if (gpt->modified & GPT_MODIFIED_HEADER1) {
primary_header->header_crc32 = 0;
primary_header->header_crc32 = Crc32(
(const uint8_t *)primary_header, primary_header->size);
}
if (gpt->modified & GPT_MODIFIED_HEADER2) {
secondary_header->header_crc32 = 0;
secondary_header->header_crc32 = Crc32(
(const uint8_t *)secondary_header, secondary_header->size);
}
}
/* Two headers are NOT bitwise identical. For example, my_lba pointers to header
* itself so that my_lba in primary and secondary is definitely different.
* Only the following fields should be identical.
*
* first_usable_lba
* last_usable_lba
* number_of_entries
* size_of_entry
* disk_uuid
*
* If any of above field are not matched, overwrite secondary with primary since
* we always trust primary.
* If any one of header is invalid, copy from another. */
int IsSynonymous(const GptHeader* a, const GptHeader* b) {
if ((a->first_usable_lba == b->first_usable_lba) &&
(a->last_usable_lba == b->last_usable_lba) &&
(a->number_of_entries == b->number_of_entries) &&
(a->size_of_entry == b->size_of_entry) &&
(!memcmp(&a->disk_uuid, &b->disk_uuid, sizeof(Guid))))
return 1;
return 0;
}
/* Primary entries and secondary entries should be bitwise identical.
* If two entries tables are valid, compare them. If not the same,
* overwrites secondary with primary (primary always has higher priority),
* and marks secondary as modified.
* If only one is valid, overwrites invalid one.
* If all are invalid, does nothing.
* This function returns bit masks for GptData.modified field.
* Note that CRC is NOT re-computed in this function.
*/
uint8_t RepairEntries(GptData *gpt, const uint32_t valid_entries) {
if (valid_entries == MASK_BOTH) {
if (memcmp(gpt->primary_entries, gpt->secondary_entries,
TOTAL_ENTRIES_SIZE)) {
memcpy(gpt->secondary_entries, gpt->primary_entries, TOTAL_ENTRIES_SIZE);
return GPT_MODIFIED_ENTRIES2;
}
} else if (valid_entries == MASK_PRIMARY) {
memcpy(gpt->secondary_entries, gpt->primary_entries, TOTAL_ENTRIES_SIZE);
return GPT_MODIFIED_ENTRIES2;
} else if (valid_entries == MASK_SECONDARY) {
memcpy(gpt->primary_entries, gpt->secondary_entries, TOTAL_ENTRIES_SIZE);
return GPT_MODIFIED_ENTRIES1;
}
return 0;
}
/* The above five fields are shared between primary and secondary headers.
* We can recover one header from another through copying those fields. */
void CopySynonymousParts(GptHeader* target, const GptHeader* source) {
target->first_usable_lba = source->first_usable_lba;
target->last_usable_lba = source->last_usable_lba;
target->number_of_entries = source->number_of_entries;
target->size_of_entry = source->size_of_entry;
memcpy(&target->disk_uuid, &source->disk_uuid, sizeof(Guid));
}
/* This function repairs primary and secondary headers if possible.
* If both headers are valid (CRC32 is correct) but
* a) indicate inconsistent usable LBA ranges,
* b) inconsistent partition entry size and number,
* c) inconsistent disk_uuid,
* we will use the primary header to overwrite secondary header.
* If primary is invalid (CRC32 is wrong), then we repair it from secondary.
* If secondary is invalid (CRC32 is wrong), then we repair it from primary.
* This function returns the bitmasks for modified header.
* Note that CRC value is NOT re-computed in this function. UpdateCrc() will
* do it later.
*/
uint8_t RepairHeader(GptData *gpt, const uint32_t valid_headers) {
GptHeader *primary_header, *secondary_header;
primary_header = (GptHeader*)gpt->primary_header;
secondary_header = (GptHeader*)gpt->secondary_header;
if (valid_headers == MASK_BOTH) {
if (!IsSynonymous(primary_header, secondary_header)) {
CopySynonymousParts(secondary_header, primary_header);
return GPT_MODIFIED_HEADER2;
}
} else if (valid_headers == MASK_PRIMARY) {
memcpy(secondary_header, primary_header, primary_header->size);
secondary_header->my_lba = gpt->drive_sectors - 1; /* the last sector */
secondary_header->alternate_lba = primary_header->my_lba;
secondary_header->entries_lba = secondary_header->my_lba -
GPT_ENTRIES_SECTORS;
return GPT_MODIFIED_HEADER2;
} else if (valid_headers == MASK_SECONDARY) {
memcpy(primary_header, secondary_header, secondary_header->size);
primary_header->my_lba = GPT_PMBR_SECTOR; /* the second sector on drive */
primary_header->alternate_lba = secondary_header->my_lba;
primary_header->entries_lba = primary_header->my_lba + GPT_HEADER_SECTOR;
return GPT_MODIFIED_HEADER1;
}
return 0;
}
int IsZero(const Guid *gp) {
return (0 == memcmp(gp, &guid_unused, sizeof(Guid)));
}
void PMBRToStr(struct pmbr *pmbr, char *str) {
char buf[256];
if (IsZero(&pmbr->boot_guid)) {
sprintf(str, "PMBR");
} else {
GuidToStr(&pmbr->boot_guid, buf);
sprintf(str, "PMBR (Boot GUID: %s)", buf);
}
}
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