usbloadergx/source/Controls/PartitionHandle.h

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/****************************************************************************
* Copyright (C) 2010
* by Dimok
*
* 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.
*
* for WiiXplorer 2010
***************************************************************************/
#ifndef PARTITION_HANDLE_H
#define PARTITION_HANDLE_H
#include <gccore.h>
#include <vector>
#include <string>
#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
#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 _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 _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 _PartitionFS
{
const char * FSName;
u64 LBA_Start;
u64 SecCount;
bool Bootable;
u8 PartitionType;
u8 PartitionNum;
} __attribute__((__packed__)) PartitionFS;
class PartitionHandle
{
public:
//! Constructor reads the MBR and all EBRs and lists up the Partitions
PartitionHandle(const DISC_INTERFACE *discio);
//! Destructor unmounts drives
~PartitionHandle();
//! 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 NULL; 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 NULL; };
//! 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; };
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);
int FindPartitions();
void CheckEBR(u8 PartNum, sec_t ebr_lba);
int CheckGPT(u8 PartNum);
const DISC_INTERFACE *interface;
std::vector<PartitionFS> PartitionList;
std::vector<std::string> MountNameList;
};
#endif