WiiFlow_Lite/source/devicemounter/PartitionHandle.h

 /****************************************************************************
 * 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 "safe_vector.hpp"
#include "libwbfs/libwbfs.h"
#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 VBR_SIGNATURE           MBR_SIGNATURE
#define GPT_SIGNATURE			"EFI PART"

#define PARTITION_BOOTABLE      0x80 /* Bootable (active) */
#define PARTITION_NONBOOTABLE   0x00 /* Non-bootable */

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

enum SIG_OFFSETS {
	BPB_NTFS_ADDR = 0x3,
	BPB_FAT16_ADDR = 0x36,
	BPB_EXT2_ADDR = 0x38,
	BPB_FAT32_ADDR = 0x52,
};

static const char FAT_SIGNATURE[3] = {'F', 'A', 'T'};
static const char NTFS_SIGNATURE[4] = {'N', 'T', 'F', 'S'};
static const char WBFS_SIGNATURE[4] = {'W', 'B', 'F', 'S'};
static const char EXT_SIGNATURE[2] = {0x53, 0xEF};

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[440];                      /* Code area; normally empty */
	u8 disk_guid[4];						/* Disk signature (optional) */
	u8 reserved[2];							/* Usually zeroed */
    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_PARTITION_ENTRY
{
    u8 Type_GUID[16];					/* Partition type GUID */
    u8 Unique_GUID[16];					/* Unique partition GUID */
    u64 First_LBA;						/* First LBA (little-endian) */
    u64 Last_LBA;						/* Last LBA (inclusive, usually odd) */
    u64 Attributes;						/* GUID Attribute flags (e.g. bit 60 denotes read-only) */
    char Name[72];						/* Partition name (36 UTF-16LE code units) */
} __attribute__((__packed__)) GUID_PARTITION_ENTRY;

typedef struct _GPT_PARTITION_TABLE {
	char magic[8];							/* "EFI PART" */
	u32 Revision;
	u32 Header_Size;						/* Size of this header */
	u32 CheckSum;
	u32 Reserved;							/* Must be 0 */
	u64 Header_LBA;							/* Location of this header, always 1 in primary copy */
	u64 Backup_Header_LBA;					/* Location of backup header, always max lba - 1 */
	u64 First_Usable_LBA;					/* Primary GPT partition table's last LBA + 1 */
	u64 Last_Usable_LBA;					/* Secondary GPT partition table's first LBA - 1 */
	u8 GUID[16];							/* Disk GUID (also referred as UUID on UNIXes) */
	u64 Table_LBA;							/* Always 2 in primary copy, or Header_LBA + 1.  Secondary copy is Backup_Header_LBA - 1 */
	u32 Num_Entries;						/* Number of entries in the partition info array */
	u32 Entry_Size;							/* Size of each array entry, usually 128 */
	u32 Entries_CheckSum;					/* CRC32 of partition array */
	u8 Zeroes[420];							/* Pad to a total 512 byte LBA or sizeof 1 LBA */
	GUID_PARTITION_ENTRY partitions[128];	/* Max 128 Partition Entries */
} __attribute__((__packed__)) GPT_PARTITION_TABLE;

typedef struct _PartitionFS {
    const char * FSName;
    u32 LBA_Start;
    u32 SecCount;
    bool Bootable;
    u8 PartitionType;
    u8 PartitionNum;
    u32 EBR_Sector;
	wbfs_t *wbfshandle;
} PartitionFS;

typedef struct _BIOS_PARAMETER_BLOCK {
	u16 Bytes_Per_Sector;		/* Size of a sector in bytes. */
	u8 Sectors_Per_Cluster;		/* Size of a cluster in sectors. */
	u16 ReservedSsectors;		/* zero on ntfs */
	u8 Fats;					/* zero on ntfs */
	u16 Root_Entries;			/* zero on ntfs */
	u16 FatSectors;				/* Number of sectors in volume. (FAT) Zero on ntfs */
	u8 Media_Type;				/* 0xf8 = hard disk */
	u16 Sectors_Per_Fat;		/* zero on ntfs*/
	u16 Sectors_Per_Track;		/* Required to boot Windows. (0x0d) */
	u16 Heads;					/* Required to boot Windows. (0x0f) */
	u32 Hidden_Sectors;			/* Offset to the start of the partition (0x11) in sectors. */
	u32 Large_Sectors;			/* Number of sectors in volume if Sectors is 0 (FAT) Zero on ntfs (0x15) */
} __attribute__((__packed__)) BIOS_PARAMETER_BLOCK; /* 25 (0x19) bytes */

typedef struct _VOLUME_BOOT_RECORD {
	u8 Jump[3];						/* Irrelevant (jump to boot up code).*/
	char Name[8];					/* Magic "NTFS    ". */
	BIOS_PARAMETER_BLOCK bpb;		/* See BIOS_PARAMETER_BLOCK. (0x0b) */
	u8 Drive_Type;					/* 0x00 floppy, 0x80 hard disk */
	u8 Current_Head;				/* zero on ntfs */
	u8 Extended_Boot_Signature; 	/* 0x80 on ntfs (Doesnt show this in M$ docs)*/ 
	u8 Reserved0;					/* zero on ntfs */
	s64 Number_of_Sectors;			/* Number of sectors in volume. (NTFS)(0x28)*/
	s64 MFT;						/* Cluster location of mft data. */
	s64 MFT_Mirror;					/* Cluster location of copy of mft. */
	s8 Clusters_Per_MFT;			/* Mft record size in clusters. */
	u8 Reserved1[3];				/* zero */
	s8 Clusters_Per_Index;			/* Index block size in clusters. */
	u8 Reserved2[3];				/* zero */
	u64 Volume_Serial_Number;		/* Irrelevant (serial number). */
	u8 Checksum[4];					/* Boot sector checksum. */ 
	u8 Bootstrap[426];				/* Irrelevant (boot up code). (0x54) */
	u16 Signature;					/* End of bootsector magic. LE 0xaa55 */
} __attribute__((__packed__)) VOLUME_BOOT_RECORD; /* 512 (0x200) bytes */

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);
        //! 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 EBR sector where this partition is described
        int GetEBRSector(int pos) { if(valid(pos)) return PartitionList[pos].EBR_Sector; else return 0; };
        //! Get the count of found partitions
        int GetPartitionCount() { 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 wbfs mount handle
        wbfs_t * GetWbfsHandle(int pos) { if(valid(pos)) return PartitionList[pos].wbfshandle; else return 0; };
		//! Set the wbfs mount handle
        bool SetWbfsHandle(int pos, wbfs_t * wbfshandle) { if(valid(pos)) {PartitionList[pos].wbfshandle = wbfshandle; return true;} else return false; };
        //! 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()); }
		bool CheckRAW(VOLUME_BOOT_RECORD * vbr);
        int FindPartitions();
        void CheckEBR(u8 PartNum, sec_t ebr_lba);
		bool CheckGPT(void);

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

#endif