mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-07-03 16:36:10 +02:00
0942bb22c5
*Added ignore of partition type and detect WBFS/FAT/NTFS partitions from their boot record sector (damn lazy partition managers which are not always editing the MBR)
363 lines
11 KiB
C++
363 lines
11 KiB
C++
/****************************************************************************
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* Copyright (C) 2010
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* by Dimok
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any
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* damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any
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* purpose, including commercial applications, and to alter it and
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* redistribute it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you
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* must not claim that you wrote the original software. If you use
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* this software in a product, an acknowledgment in the product
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* documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and
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* must not be misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*
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* for WiiXplorer 2010
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***************************************************************************/
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#include <gccore.h>
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#include <fat.h>
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#include <ntfs.h>
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#include <ext2.h>
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#include <stdio.h>
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#include <string.h>
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#include <malloc.h>
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#include "libs/libwbfs/libwbfs.h"
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#include "utils/uncompress.h"
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#include "PartitionHandle.h"
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#define PARTITION_TYPE_DOS33_EXTENDED 0x05 /* DOS 3.3+ extended partition */
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#define PARTITION_TYPE_WIN95_EXTENDED 0x0F /* Windows 95 extended partition */
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#define CACHE 32
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#define SECTORS 64
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static inline const char * PartFromType(int type)
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{
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switch (type)
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{
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case 0x00: return "Unused";
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case 0x01: return "FAT12";
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case 0x04: return "FAT16";
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case 0x05: return "Extended";
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case 0x06: return "FAT16";
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case 0x07: return "NTFS";
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case 0x0b: return "FAT32";
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case 0x0c: return "FAT32";
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case 0x0e: return "FAT16";
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case 0x0f: return "Extended";
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case 0x82: return "LxSWP";
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case 0x83: return "LINUX";
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case 0x8e: return "LxLVM";
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case 0xa8: return "OSX";
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case 0xab: return "OSXBT";
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case 0xaf: return "OSXHF";
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case 0xbf: return "WBFS";
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case 0xe8: return "LUKS";
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default: return "Unknown";
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}
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}
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PartitionHandle::PartitionHandle(const DISC_INTERFACE *discio)
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{
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interface = discio;
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// Sanity check
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if (!interface)
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return;
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// Start the device and check that it is inserted
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if (!interface->startup())
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return;
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if (!interface->isInserted())
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return;
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FindPartitions();
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}
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PartitionHandle::~PartitionHandle()
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{
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UnMountAll();
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//shutdown device
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interface->shutdown();
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}
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bool PartitionHandle::IsMounted(int pos)
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{
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if(pos < 0 || pos >= (int) MountNameList.size())
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return false;
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if(MountNameList[pos].size() == 0)
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return false;
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return true;
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}
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bool PartitionHandle::Mount(int pos, const char * name, bool forceFAT)
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{
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if(!valid(pos))
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return false;
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if(!name)
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return false;
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UnMount(pos);
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if(pos >= (int) MountNameList.size())
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MountNameList.resize(GetPartitionCount());
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MountNameList[pos] = name;
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//! Some stupid partition manager think they don't need to edit the freaken MBR.
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//! So we need to check the first 64 sectors and see if some partition is there.
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//! libfat does that by default so let's use it.
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//! We do that only on sd not on usb.
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if(forceFAT && (!GetFSName(pos) || strcmp(GetFSName(pos), "Unknown") == 0))
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{
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if (fatMount(MountNameList[pos].c_str(), interface, 0, CACHE, SECTORS))
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{
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extern sec_t _FAT_startSector;
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AddPartition("FAT", _FAT_startSector, 0xdeadbeaf, true, 0x0c, 0);
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return true;
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}
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}
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if(strncmp(GetFSName(pos), "FAT", 3) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
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{
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if (fatMount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS))
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{
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if(strcmp(GetFSName(pos), "GUID-Entry") == 0)
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PartitionList[pos].FSName = "FAT";
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return true;
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}
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}
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if(strncmp(GetFSName(pos), "NTFS", 4) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
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{
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if(ntfsMount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS, NTFS_SHOW_HIDDEN_FILES | NTFS_RECOVER))
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{
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PartitionList[pos].FSName = "NTFS";
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return true;
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}
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}
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if(strncmp(GetFSName(pos), "LINUX", 5) == 0 || strcmp(GetFSName(pos), "GUID-Entry") == 0)
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{
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if(ext2Mount(MountNameList[pos].c_str(), interface, GetLBAStart(pos), CACHE, SECTORS, EXT2_FLAG_DEFAULT))
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{
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PartitionList[pos].FSName = "LINUX";
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return true;
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}
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}
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MountNameList[pos].clear();
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return false;
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}
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void PartitionHandle::UnMount(int pos)
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{
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if(!interface)
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return;
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if(pos >= (int) MountNameList.size())
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return;
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if(MountNameList[pos].size() == 0)
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return;
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char DeviceSyn[20];
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snprintf(DeviceSyn, sizeof(DeviceSyn), "%s:", MountNameList[pos].c_str());
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//closing all open Files write back the cache
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fatUnmount(DeviceSyn);
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//closing all open Files write back the cache
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ntfsUnmount(DeviceSyn, true);
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//closing all open Files write back the cache
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ext2Unmount(DeviceSyn);
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//Remove name from list
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MountNameList[pos].clear();
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}
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bool PartitionHandle::IsExisting(u64 lba)
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{
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for(u32 i = 0; i < PartitionList.size(); ++i)
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{
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if(PartitionList[i].LBA_Start == lba)
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return true;
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}
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return false;
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}
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int PartitionHandle::FindPartitions()
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{
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MASTER_BOOT_RECORD mbr;
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// Read the first sector on the device
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if (!interface->readSectors(0, 1, &mbr))
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return -1;
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// If this is the devices master boot record
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if (mbr.signature != MBR_SIGNATURE)
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return -1;
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for (int i = 0; i < 4; i++)
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{
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PARTITION_RECORD * partition = (PARTITION_RECORD *) &mbr.partitions[i];
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if(partition->type == PARTITION_TYPE_GPT)
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{
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int ret = CheckGPT(i);
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if(ret == 0) // if it's a GPT we don't need to go on looking through the mbr anymore
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return ret;
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}
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if(partition->type == PARTITION_TYPE_DOS33_EXTENDED || partition->type == PARTITION_TYPE_WIN95_EXTENDED)
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{
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CheckEBR(i, le32(partition->lba_start));
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continue;
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}
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if(le32(partition->block_count) > 0 && !IsExisting(le32(partition->lba_start)))
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{
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AddPartition(PartFromType(partition->type), le32(partition->lba_start),
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le32(partition->block_count), (partition->status == PARTITION_BOOTABLE),
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partition->type, i);
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}
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}
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return 0;
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}
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void PartitionHandle::CheckEBR(u8 PartNum, sec_t ebr_lba)
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{
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EXTENDED_BOOT_RECORD ebr;
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sec_t next_erb_lba = 0;
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do
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{
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// Read and validate the extended boot record
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if (!interface->readSectors(ebr_lba + next_erb_lba, 1, &ebr))
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return;
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if (ebr.signature != EBR_SIGNATURE)
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return;
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if(le32(ebr.partition.block_count) > 0 && !IsExisting(ebr_lba + next_erb_lba + le32(ebr.partition.lba_start)))
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{
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AddPartition(PartFromType(ebr.partition.type), ebr_lba + next_erb_lba + le32(ebr.partition.lba_start),
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le32(ebr.partition.block_count), (ebr.partition.status == PARTITION_BOOTABLE),
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ebr.partition.type, PartNum);
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}
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// Get the start sector of the current partition
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// and the next extended boot record in the chain
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next_erb_lba = le32(ebr.next_ebr.lba_start);
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}
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while(next_erb_lba > 0);
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}
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static const u8 TYPE_UNUSED[16] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
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static const u8 TYPE_BIOS[16] = { 0x48,0x61,0x68,0x21,0x49,0x64,0x6F,0x6E,0x74,0x4E,0x65,0x65,0x64,0x45,0x46,0x49 };
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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 };
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int PartitionHandle::CheckGPT(u8 PartNum)
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{
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GPT_HEADER gpt_header;
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// Read and validate the extended boot record
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if (!interface->readSectors(1, 1, &gpt_header))
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return -1;
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if(strncmp(gpt_header.magic, "EFI PART", 8) != 0)
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return -1;
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gpt_header.part_table_lba = le64(gpt_header.part_table_lba);
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gpt_header.part_entries = le32(gpt_header.part_entries);
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gpt_header.part_entry_size = le32(gpt_header.part_entry_size);
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gpt_header.part_entry_checksum = le32(gpt_header.part_entry_checksum);
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u8 * sector_buf = new u8[BYTES_PER_SECTOR];
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u64 next_lba = gpt_header.part_table_lba;
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for(u32 i = 0; i < gpt_header.part_entries; ++i)
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{
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if (!interface->readSectors(next_lba, 1, sector_buf))
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break;
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for(u32 n = 0; n < BYTES_PER_SECTOR/gpt_header.part_entry_size; ++n, ++i)
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{
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GUID_PART_ENTRY * part_entry = (GUID_PART_ENTRY *) (sector_buf+gpt_header.part_entry_size*n);
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if(memcmp(part_entry->part_type_guid, TYPE_UNUSED, 16) == 0)
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continue;
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if(IsExisting(le64(part_entry->part_first_lba)))
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continue;
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bool bootable = (memcmp(part_entry->part_type_guid, TYPE_BIOS, 16) == 0);
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AddPartition("GUID-Entry", le64(part_entry->part_first_lba), le64(part_entry->part_last_lba), bootable, PARTITION_TYPE_GPT, PartNum);
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}
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next_lba++;
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}
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delete [] sector_buf;
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return 0;
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}
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void PartitionHandle::AddPartition(const char * name, u64 lba_start, u64 sec_count, bool bootable, u8 part_type, u8 part_num)
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{
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char buffer[BYTES_PER_SECTOR];
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if (!interface->readSectors(lba_start, 1, buffer))
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return;
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wbfs_head_t *head = (wbfs_head_t *) buffer;
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if (head->magic == wbfs_htonl(WBFS_MAGIC))
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{
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name = "WBFS";
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part_type = 0xBF; //Override partition type on WBFS
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}
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else if(*((u16 *) (buffer + 0x1FE)) == 0x55AA)
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{
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//! Partition typ can be missleading the correct partition format. Stupid lazy ass Partition Editors.
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if((memcmp(buffer + 0x36, "FAT", 3) == 0 || memcmp(buffer + 0x52, "FAT", 3) == 0) &&
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strncmp(PartFromType(part_type), "FAT", 3) != 0)
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{
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name = "FAT32";
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part_type = 0x0c;
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}
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if (memcmp(buffer + 0x03, "NTFS", 4) == 0)
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{
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name = "NTFS";
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part_type = 0x07;
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}
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}
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PartitionFS PartitionEntrie;
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PartitionEntrie.FSName = name;
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PartitionEntrie.LBA_Start = lba_start;
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PartitionEntrie.SecCount = sec_count;
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PartitionEntrie.Bootable = bootable;
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PartitionEntrie.PartitionType = part_type;
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PartitionEntrie.PartitionNum = part_num;
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PartitionList.push_back(PartitionEntrie);
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}
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