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usbloadergx/source/Controls/PartitionHandle.cpp

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/****************************************************************************
* Copyright (C) 2013 by Cyan
* 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
***************************************************************************/
#include <gccore.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include "libs/libfat/fat.h"
#include "libs/libntfs/ntfs.h"
#include "libs/libext2fs/ext2.h"
#include "libs/libwbfs/libwbfs.h"
#include "utils/uncompress.h"
#include "PartitionHandle.h"
//! libfat stuff
extern "C"
{
sec_t FindFirstValidPartition(const DISC_INTERFACE* disc);
}
#define PARTITION_TYPE_DOS33_EXTENDED 0x05 /* DOS 3.3+ extended partition */
#define PARTITION_TYPE_WIN95_EXTENDED 0x0F /* Windows 95 extended partition */
#define CACHE 32
#define SECTORS 64
static inline const char * PartFromType(int type)
{
switch (type)
{
case 0x00: return "Unused";
case 0x01: return "FAT12";
case 0x04: return "FAT16";
case 0x05: return "Extended";
case 0x06: return "FAT16";
case 0x07: return "NTFS";
case 0x0b: return "FAT32";
case 0x0c: return "FAT32";
case 0x0e: return "FAT16";
case 0x0f: return "Extended";
case 0x82: return "LxSWP";
case 0x83: return "LINUX";
case 0x8e: return "LxLVM";
case 0xa8: return "OSX";
case 0xab: return "OSXBT";
case 0xaf: return "OSXHF";
case 0xbf: return "WBFS";
case 0xe8: return "LUKS";
default: return "Unknown";
}
}
PartitionHandle::PartitionHandle(const DISC_INTERFACE *discio)
: interface(discio)
{
// Sanity check
if (!interface)
return;
// Start the device and check that it is inserted
if (!interface->startup())
return;
if (!interface->isInserted())
return;
FindPartitions();
}
PartitionHandle::~PartitionHandle()
{
UnMountAll();
//shutdown device
interface->shutdown();
}
bool PartitionHandle::IsMounted(int pos)
{
if(pos < 0 || pos >= (int) MountNameList.size())
return false;
if(MountNameList[pos].size() == 0)
return false;
return true;
}
bool PartitionHandle::Mount(int pos, const char * name, bool forceFAT)
{
if(!valid(pos))
return false;
if(!name)
return false;
UnMount(pos);
if(pos >= (int) MountNameList.size())
MountNameList.resize(pos+1);
MountNameList[pos] = name;
//! Some stupid partition manager think they don't need to edit the freaken MBR.
//! So we need to check the first 64 sectors and see if some partition is there.
//! libfat does that by default so let's use it.
//! We do that only on sd not on usb.
if(forceFAT && (!GetFSName(pos) || strcmp(GetFSName(pos), "Unknown") == 0))
{
if (fatMount(MountNameList[pos].c_str(), interface, 0, CACHE, SECTORS))
{
sec_t FAT_startSector = FindFirstValidPartition(interface);
AddPartition("FAT", FAT_startSector, 0xdeadbeaf, true, 0x0c, 0, TABLE_TYPE_UNKNOWN);
return true;
}
}
if(strncmp(GetFSName(pos), "FAT", 3) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
{
if (fatMount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS))
{
if(strcmp(GetFSName(pos), "GUID-Entry") == 0)
PartitionList[pos].FSName = "FAT";
return true;
}
}
if(strncmp(GetFSName(pos), "NTFS", 4) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
{
if(ntfsMount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS, NTFS_SHOW_HIDDEN_FILES | NTFS_RECOVER))
{
PartitionList[pos].FSName = "NTFS";
return true;
}
}
if(strncmp(GetFSName(pos), "LINUX", 5) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
{
if(ext2Mount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS, EXT2_FLAG_DEFAULT))
{
PartitionList[pos].FSName = "LINUX";
return true;
}
}
MountNameList[pos].clear();
return false;
}
void PartitionHandle::UnMount(int pos)
{
if(!interface)
return;
if(pos >= (int) MountNameList.size())
return;
if(MountNameList[pos].size() == 0)
return;
char DeviceSyn[20];
snprintf(DeviceSyn, sizeof(DeviceSyn), "%s:", MountNameList[pos].c_str());
//closing all open Files write back the cache
fatUnmount(DeviceSyn);
//closing all open Files write back the cache
ntfsUnmount(DeviceSyn, true);
//closing all open Files write back the cache
ext2Unmount(DeviceSyn);
//Remove name from list
MountNameList[pos].clear();
}
u32 PartitionHandle::GetPartitionClusterSize(u32 lba_start)
{
char *buffer = (char *) malloc(MAX_BYTES_PER_SECTOR);
if(!buffer) return 0;
if (!interface->readSectors(lba_start, 1, buffer))
{
free(buffer);
return 0;
}
u32 cluster_size = 0;
// Only for FAT partitions
if(*((u16 *) (buffer + 0x1FE)) == 0x55AA)
{
if((memcmp(buffer + 0x36, "FAT", 3) == 0 || memcmp(buffer + 0x52, "FAT", 3) == 0))
{
u16 sector_sz = *((u8*) (buffer + 0x0C)) << 8 | *((u8*) (buffer + 0x0B));
u8 sector_per_cluster = *((u8*) (buffer + 0x0D));
cluster_size = sector_sz * sector_per_cluster;
}
}
free(buffer);
return cluster_size;
}
bool PartitionHandle::IsExisting(u64 lba)
{
for(u32 i = 0; i < PartitionList.size(); ++i)
{
if(PartitionList[i].LBA_Start == lba)
return true;
}
return false;
}
int PartitionHandle::FindPartitions()
{
MASTER_BOOT_RECORD *mbr = (MASTER_BOOT_RECORD *) malloc(MAX_BYTES_PER_SECTOR);
if(!mbr) return -1;
// Read the first sector on the device
if (!interface->readSectors(0, 1, mbr))
{
free(mbr);
return -1;
}
// If this is not the device's master boot record
if (mbr->signature != MBR_SIGNATURE && mbr->signature != MBR_SIGNATURE_MOD)
{
// Check if the device has only one WBFS partition without a table.
wbfs_head_t *head = (wbfs_head_t *) mbr;
if (head->magic == wbfs_htonl(WBFS_MAGIC))
{
AddPartition("WBFS", 0, 0xdeadbeaf, true, 0xBF, 0, TABLE_TYPE_UNKNOWN);
free(mbr);
return 0;
}
free(mbr);
return -1;
}
for (int i = 0; i < 4; i++)
{
PARTITION_RECORD * partition = (PARTITION_RECORD *) &mbr->partitions[i];
if(partition->type == PARTITION_TYPE_GPT)
{
int ret = CheckGPT(i);
if(ret == 0) // if it's a GPT we don't need to go on looking through the mbr anymore
return ret;
}
if(partition->type == PARTITION_TYPE_DOS33_EXTENDED || partition->type == PARTITION_TYPE_WIN95_EXTENDED)
{
CheckEBR(i, le32(partition->lba_start));
continue;
}
if(le32(partition->block_count) > 0 && !IsExisting(le32(partition->lba_start)))
{
AddPartition(PartFromType(partition->type), le32(partition->lba_start),
le32(partition->block_count), (partition->status == PARTITION_BOOTABLE),
partition->type, i, MBR);
}
}
free(mbr);
return 0;
}
void PartitionHandle::CheckEBR(u8 PartNum, sec_t ebr_lba)
{
EXTENDED_BOOT_RECORD *ebr = (EXTENDED_BOOT_RECORD *) malloc(MAX_BYTES_PER_SECTOR);
if(!ebr) return;
sec_t next_erb_lba = 0;
do
{
// Read and validate the extended boot record
if (!interface->readSectors(ebr_lba + next_erb_lba, 1, ebr))
{
free(ebr);
return;
}
if (ebr->signature != EBR_SIGNATURE)
{
free(ebr);
return;
}
if(le32(ebr->partition.block_count) > 0 && !IsExisting(ebr_lba + next_erb_lba + le32(ebr->partition.lba_start)))
{
AddPartition(PartFromType(ebr->partition.type), ebr_lba + next_erb_lba + le32(ebr->partition.lba_start),
le32(ebr->partition.block_count), (ebr->partition.status == PARTITION_BOOTABLE),
ebr->partition.type, PartNum, EBR);
}
// Get the start sector of the current partition
// and the next extended boot record in the chain
next_erb_lba = le32(ebr->next_ebr.lba_start);
}
while(next_erb_lba > 0);
free(ebr);
}
static const u8 TYPE_UNUSED[16] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
static const u8 TYPE_BIOS[16] = { 0x48,0x61,0x68,0x21,0x49,0x64,0x6F,0x6E,0x74,0x4E,0x65,0x65,0x64,0x45,0x46,0x49 };
static const u8 TYPE_LINUX_MS_BASIC_DATA[16] = { 0xA2,0xA0,0xD0,0xEB,0xE5,0xB9,0x33,0x44,0x87,0xC0,0x68,0xB6,0xB7,0x26,0x99,0xC7 };
int PartitionHandle::CheckGPT(u8 PartNum)
{
GPT_HEADER *gpt_header = (GPT_HEADER *) malloc(MAX_BYTES_PER_SECTOR);
if(!gpt_header) return -1;
// Read and validate the extended boot record
if (!interface->readSectors(1, 1, gpt_header))
{
free(gpt_header);
return -1;
}
if(strncmp(gpt_header->magic, "EFI PART", 8) != 0)
{
free(gpt_header);
return -1;
}
gpt_header->part_table_lba = le64(gpt_header->part_table_lba);
gpt_header->part_entries = le32(gpt_header->part_entries);
gpt_header->part_entry_size = le32(gpt_header->part_entry_size);
gpt_header->part_entry_checksum = le32(gpt_header->part_entry_checksum);
u8 * sector_buf = new u8[MAX_BYTES_PER_SECTOR];
u64 next_lba = gpt_header->part_table_lba;
for(u32 i = 0; i < gpt_header->part_entries; ++i)
{
if (!interface->readSectors(next_lba, 1, sector_buf))
break;
for(u32 n = 0; n < BYTES_PER_SECTOR/gpt_header->part_entry_size; ++n, ++i)
{
GUID_PART_ENTRY * part_entry = (GUID_PART_ENTRY *) (sector_buf+gpt_header->part_entry_size*n);
if(memcmp(part_entry->part_type_guid, TYPE_UNUSED, 16) == 0)
continue;
if(IsExisting(le64(part_entry->part_first_lba)))
continue;
bool bootable = (memcmp(part_entry->part_type_guid, TYPE_BIOS, 16) == 0);
AddPartition("GUID-Entry", le64(part_entry->part_first_lba), le64(part_entry->part_last_lba)-le64(part_entry->part_first_lba), bootable, PARTITION_TYPE_GPT, i, GPT);
}
next_lba++;
}
delete [] sector_buf;
free(gpt_header);
return 0;
}
void PartitionHandle::AddPartition(const char * name, u64 lba_start, u64 sec_count, bool bootable, u8 part_type, u8 part_num, u8 part_TableType)
{
char *buffer = (char *) malloc(MAX_BYTES_PER_SECTOR);
if (!interface->readSectors(lba_start, 1, buffer))
{
free(buffer);
return;
}
wbfs_head_t *head = (wbfs_head_t *) buffer;
if (head->magic == wbfs_htonl(WBFS_MAGIC))
{
name = "WBFS";
part_type = 0xBF; //Override partition type on WBFS
//! correct sector size in physical sectors (512 bytes per sector)
sec_count = (u64) head->n_hd_sec * (u64) (1 << head->hd_sec_sz_s) / (u64) BYTES_PER_SECTOR;
}
else if(*((u16 *) (buffer + 0x1FE)) == 0x55AA)
{
//! Partition type can be missleading the correct partition format. Stupid lazy ass Partition Editors.
if((memcmp(buffer + 0x36, "FAT", 3) == 0 || memcmp(buffer + 0x52, "FAT", 3) == 0) &&
strncmp(PartFromType(part_type), "FAT", 3) != 0)
{
name = "FAT32";
part_type = 0x0c;
}
if (memcmp(buffer + 0x03, "NTFS", 4) == 0)
{
name = "NTFS";
part_type = 0x07;
}
}
PartitionFS PartitionEntrie;
PartitionEntrie.FSName = name;
PartitionEntrie.LBA_Start = lba_start;
PartitionEntrie.SecCount = sec_count;
PartitionEntrie.Bootable = bootable;
PartitionEntrie.PartitionType = part_type;
PartitionEntrie.PartitionNum = part_num;
PartitionEntrie.PartitionTableType = part_TableType;
PartitionList.push_back(PartitionEntrie);
free(buffer);
}
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