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// Copyright (c) 2012 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.
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <fcntl.h>
#include <features.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "endian.h"
#include "gpt.h"
#include "cgptlib.h"
// Just for clarity
enum {
CGPT_OK = 0,
struct legacy_partition {
uint8_t status;
uint8_t f_head;
uint8_t f_sect;
uint8_t f_cyl;
uint8_t type;
uint8_t l_head;
uint8_t l_sect;
uint8_t l_cyl;
uint32_t f_lba;
uint32_t num_sect;
} __attribute__((packed));
// syslinux uses this format:
struct pmbr {
uint8_t bootcode[424];
Guid boot_guid;
uint32_t disk_id;
uint8_t magic[2]; // 0x1d, 0x9a
struct legacy_partition part[4];
uint8_t sig[2]; // 0x55, 0xaa
} __attribute__((packed));
void PMBRToStr(struct pmbr *pmbr, char *str, unsigned int buflen);
// Handle to the drive storing the GPT.
struct drive {
int fd; /* file descriptor */
uint64_t size; /* total size (in bytes) */
GptData gpt;
struct pmbr pmbr;
/* mode should be O_RDONLY or O_RDWR */
int DriveOpen(const char *drive_path, struct drive *drive, int mode);
int DriveClose(struct drive *drive, int update_as_needed);
int CheckValid(const struct drive *drive);
/* GUID conversion functions. Accepted format:
* "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
* At least GUID_STRLEN bytes should be reserved in 'str' (included the tailing
* '\0').
#define GUID_STRLEN 37
int StrToGuid(const char *str, Guid *guid);
void GuidToStr(const Guid *guid, char *str, unsigned int buflen);
int GuidEqual(const Guid *guid1, const Guid *guid2);
int IsZero(const Guid *guid);
/* Constant global type values to compare against */
extern const Guid guid_chromeos_firmware;
extern const Guid guid_chromeos_kernel;
extern const Guid guid_chromeos_rootfs;
extern const Guid guid_linux_data;
extern const Guid guid_chromeos_reserved;
extern const Guid guid_efi;
extern const Guid guid_unused;
int ReadPMBR(struct drive *drive);
int WritePMBR(struct drive *drive);
/* Convert possibly unterminated UTF16 string to UTF8.
* Caller must prepare enough space for UTF8, which could be up to
* twice the byte length of UTF16 string plus the terminating '\0'.
* Return: CGPT_OK --- all character are converted successfully.
* CGPT_FAILED --- convert error, i.e. output buffer is too short.
int UTF16ToUTF8(const uint16_t *utf16, unsigned int maxinput,
uint8_t *utf8, unsigned int maxoutput);
/* Convert null-terminated UTF8 string to UTF16.
* Caller must prepare enough space for UTF16, which is the byte length of UTF8
* plus the terminating 0x0000.
* Return: CGPT_OK --- all character are converted successfully.
* CGPT_FAILED --- convert error, i.e. output buffer is too short.
int UTF8ToUTF16(const uint8_t *utf8, uint16_t *utf16, unsigned int maxoutput);
/* Helper functions for supported GPT types. */
int ResolveType(const Guid *type, char *buf);
int SupportedType(const char *name, Guid *type);
void PrintTypes(void);
void EntryDetails(GptEntry *entry, uint32_t index, int raw);
uint32_t GetNumberOfEntries(const GptData *gpt);
GptEntry *GetEntry(GptData *gpt, int secondary, uint32_t entry_index);
void SetPriority(GptData *gpt, int secondary, uint32_t entry_index,
int priority);
int GetPriority(GptData *gpt, int secondary, uint32_t entry_index);
void SetTries(GptData *gpt, int secondary, uint32_t entry_index, int tries);
int GetTries(GptData *gpt, int secondary, uint32_t entry_index);
void SetSuccessful(GptData *gpt, int secondary, uint32_t entry_index,
int success);
int GetSuccessful(GptData *gpt, int secondary, uint32_t entry_index);
uint8_t RepairHeader(GptData *gpt, const uint32_t valid_headers);
uint8_t RepairEntries(GptData *gpt, const uint32_t valid_entries);
void UpdateCrc(GptData *gpt);
int IsSynonymous(const GptHeader* a, const GptHeader* b);
// For usage and error messages.
extern const char* progname;
extern const char* command;
void Error(const char *format, ...);
// The code paths that require uuid_generate are not used currently in
// libcgpt-cc.a so using this method would create an unnecessary dependency
// on libuuid which then requires us to build it for 32-bit for the static
// post-installer. So, we just expose this function pointer which should be
// set to uuid_generate in case of the cgpt binary and can be null or some
// no-op method in case of ilbcgpt-cc.a.
extern void (*uuid_generator)(uint8_t* buffer);
// Command functions.
int cmd_show(int argc, char *argv[]);
int cmd_repair(int argc, char *argv[]);
int cmd_create(int argc, char *argv[]);
int cmd_add(int argc, char *argv[]);
int cmd_boot(int argc, char *argv[]);
int cmd_find(int argc, char *argv[]);
int cmd_prioritize(int argc, char *argv[]);
int cmd_legacy(int argc, char *argv[]);
#define ARRAY_COUNT(array) (sizeof(array)/sizeof((array)[0]))
const char *GptError(int errnum);
// Size in chars of the GPT Entry's PartitionName field
/* The standard "assert" macro goes away when NDEBUG is defined. This doesn't.
#define require(A) do { \
if (!(A)) { \
fprintf(stderr, "condition (%s) failed at %s:%d\n", \
#A, __FILE__, __LINE__); \
exit(1); } \
} while (0)