WiiFlow_Lite/source/devicemounter/PartitionHandle.h

 /****************************************************************************
 * Copyright (C) 2010 by Dimok
 *           (C) 2012 by FIX94
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any
 * damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any
 * purpose, including commercial applications, and to alter it and
 * redistribute it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you
 * must not claim that you wrote the original software. If you use
 * this software in a product, an acknowledgment in the product
 * documentation would be appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and
 * must not be misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source
 * distribution.
 ***************************************************************************/
#ifndef PARTITION_HANDLE_H
#define PARTITION_HANDLE_H

#include <gccore.h>
#include "libwbfs/libwbfs.h"
#include <string>
#include <vector>

#define MAX_PARTITIONS			32 /* Maximum number of partitions that can be found */
#define MAX_MOUNTS				10 /* Maximum number of mounts available at one time */
#define MAX_SYMLINK_DEPTH		10 /* Maximum search depth when resolving symbolic links */

#define MBR_SIGNATURE			0x55AA
#define EBR_SIGNATURE			MBR_SIGNATURE

/* for WiiU modified drives to ignore formatting it (thx jayjay123) */
#define MBR_SIGNATURE_MOD		0x55AB
#define EBR_SIGNATURE_MOD		MBR_SIGNATURE_MOD

#define PARTITION_BOOTABLE		0x80 /* Bootable (active) */
#define PARTITION_NONBOOTABLE	0x00 /* Non-bootable */
#define PARTITION_TYPE_GPT		0xEE /* Indicates that a GPT header is available */

#define GUID_SYSTEM_PARTITION		0x0000000000000001LL	/* System partition (disk partitioning utilities must reserve the partition as is) */
#define GUID_READ_ONLY_PARTITION	0x0800000000000000LL	/* Read-only partition */
#define GUID_HIDDEN_PARTITION		0x2000000000000000LL	/* Hidden partition */
#define GUID_NO_AUTOMOUNT_PARTITION	0x4000000000000000LL	/* Do not automount (e.g., do not assign drive letter) */

#define BYTES_PER_SECTOR		512  /* Default in libogc */
#define MAX_BYTES_PER_SECTOR	4096 /* Max bytes per sector */

typedef struct _PARTITION_RECORD {
	u8 status;							/* Partition status; see above */
	u8 chs_start[3];					/* Cylinder-head-sector address to first block of partition */
	u8 type;							/* Partition type; see above */
	u8 chs_end[3];						/* Cylinder-head-sector address to last block of partition */
	u32 lba_start;						/* Local block address to first sector of partition */
	u32 block_count;					/* Number of blocks in partition */
} ATTRIBUTE_PACKED PARTITION_RECORD;


typedef struct _MASTER_BOOT_RECORD {
	u8 code_area[446];					/* Code area; normally empty */
	PARTITION_RECORD partitions[4];		/* 4 primary partitions */
	u16 signature;						/* MBR signature; 0xAA55 */
} ATTRIBUTE_PACKED MASTER_BOOT_RECORD;

typedef struct _EXTENDED_BOOT_RECORD {
	u8 code_area[446];					/* Code area; normally empty */
	PARTITION_RECORD partition;			/* Primary partition */
	PARTITION_RECORD next_ebr;			/* Next extended boot record in the chain */
	u8 reserved[32];					/* Normally empty */
	u16 signature;						/* EBR signature; 0xAA55 */
} ATTRIBUTE_PACKED EXTENDED_BOOT_RECORD;

typedef struct _GUID_PART_ENTRY
{
	u8 part_type_guid[16];		/* Partition type GUID */
	u8 uniq_part_guid[16];		/* Unique partition GUID */
	u64 part_first_lba;			/* First LBA (little-endian) */
	u64 part_last_lba;			/* Last LBA (inclusive, usually odd) */
	u64 attribute_flags;		/* GUID Attribute flags (e.g. bit 60 denotes read-only) */
	char partition_name[72];	/* Partition name (36 UTF-16LE code units) */
} ATTRIBUTE_PACKED GUID_PART_ENTRY;

typedef struct _GPT_HEADER
{
	char magic[8];				/* "EFI PART" */
	u32 revision;				/* For version 1.0 */
	u32 header_size;			/* Header size in bytes */
	u32 checksum;				/* CRC32 of header (0 to header size), with this field zeroed during calculation */
	u32 reserved;				/* must be 0 */
	u64 header_lba;				/* Current LBA (location of this header copy) */
	u64 backup_lba;				/* Backup LBA (location of the other header copy) */
	u64 first_part_lba;			/* First usable LBA for partitions (primary partition table last LBA + 1) */
	u64 last_part_lba;			/* Last usable LBA (secondary partition table first LBA - 1) */
	u8 disk_guid[16];			/* Disk GUID (also referred as UUID on UNIXes) */
	u64 part_table_lba;			/* Partition entries starting LBA (always 2 in primary copy) */
	u32 part_entries;			/* Number of partition entries */
	u32 part_entry_size;		/* Size of a partition entry (usually 128) */
	u32 part_entry_checksum;	/* CRC32 of partition array */
	u8 zeros[420];
} ATTRIBUTE_PACKED GPT_HEADER;

typedef struct _PartitionFS {
	const char *FSName;
	u64 LBA_Start;
	u64 SecCount;
	bool Bootable;
	u8 PartitionType;
	u8 PartitionNum;
	wbfs_t *wbfshandle;
} ATTRIBUTE_PACKED PartitionFS;


class PartitionHandle
{
public:
	void Init();
	//! Read the MBR and all EBRs and lists up the Partitions
	void SetDevice(const DISC_INTERFACE *discio);
	//! Unmount drives
	void Cleanup();
	//! Is Drive inserted
	bool IsInserted() { if(!interface) return false; else return interface->isInserted(); };
	//! Is the partition Mounted
	bool IsMounted(int pos);
	//! Mount a specific Partition
	bool Mount(int pos, const char * name, bool forceFAT = false);
	//! UnMount a specific Partition
	void UnMount(int pos);
	//! UnMount all Partition
	void UnMountAll() { for(u32 i = 0; i < PartitionList.size(); ++i) UnMount(i); };
	//! Get the Mountname
	const char * MountName(int pos) { if(pos < 0 || pos >= (int) MountNameList.size() || !MountNameList[pos].size()) return ""; else return MountNameList[pos].c_str(); };
	//! Get the Name of the FileSystem e.g. "FAT32"
	const char * GetFSName(int pos) { if(valid(pos)) return PartitionList[pos].FSName; else return ""; };
	//! Get the LBA where the partition is located
	u32 GetLBAStart(int pos) { if(valid(pos)) return PartitionList[pos].LBA_Start; else return 0; };
	//! Get the partition size in sectors of this partition
	u32 GetSecCount(int pos) { if(valid(pos)) return PartitionList[pos].SecCount; else return 0; };
	//! Check if the partition is Active or NonBootable
	bool IsActive(int pos) { if(valid(pos)) return PartitionList[pos].Bootable; else return false; };
	//! Get the partition type
	int GetPartitionType(int pos) { if(valid(pos)) return PartitionList[pos].PartitionType; else return -1; };
	//! Get the entrie number in MBR of this partition
	int GetPartitionNum(int pos) { if(valid(pos)) return PartitionList[pos].PartitionNum; else return -1; };
	//! Get the count of found partitions
	int GetPartitionCount() const { return PartitionList.size(); };
	//! Get the partition size in bytes
	u64 GetSize(int pos) { if(valid(pos)) return (u64) PartitionList[pos].SecCount*BYTES_PER_SECTOR; else return 0; };
	//! Get the whole partition record struct
	PartitionFS * GetPartitionRecord(int pos) { if(valid(pos)) return &PartitionList[pos]; else return NULL; };
	//! Get the disc interface of this handle
	const DISC_INTERFACE * GetDiscInterface() { return interface; };
	//! Get the wbfs mount handle
	wbfs_t *GetWbfsHandle(int pos);
	//! Set the wbfs mount handle
	bool SetWbfsHandle(int pos, wbfs_t *wbfshandle);
protected:
	bool valid(int pos) { return (pos >= 0 && pos < (int)PartitionList.size()); };
	void AddPartition(const char *name, u64 lba_start, u64 sec_count, bool bootable, u8 part_type, u8 part_num);
	bool IsExisting(u64 lba);
	s8 FindPartitions();
	void CheckEBR(u8 PartNum, sec_t ebr_lba);
	s8 CheckGPT();

	const DISC_INTERFACE *interface;
	std::vector<PartitionFS> PartitionList;
	std::vector<std::string> MountNameList;
};

#endif