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rufus/src/ms-sys/file.c
Pete Batard cd5665881c [core] drive handling improvements
* Use IOCTL_DISK_UPDATE_PROPERTIES after partitioning
* Use IOCTL_DISK_DELETE_DRIVE_LAYOUT to invalidate partitions before formatting
* Fix handling of unpartitioned drives
* Increase delay after partitioning
* All of the above should help with the infamous #122
* Also fix display of error messages in ms-sys' file.c as well as stdio.c
* Also add commandline option -f to list fixed drives
2013-06-25 02:55:25 +01:00

169 lines
5.4 KiB
C

/******************************************************************
Copyright (C) 2009 Henrik Carlqvist
Modified for Rufus/Windows (C) 2011-2012 Pete Batard
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
******************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "../rufus.h"
#include "file.h"
/* Returns the number of bytes written or -1 on error */
int64_t write_sectors(HANDLE hDrive, uint64_t SectorSize,
uint64_t StartSector, uint64_t nSectors,
const void *pBuf)
{
LARGE_INTEGER ptr;
DWORD Size;
if((nSectors*SectorSize) > 0xFFFFFFFFUL)
{
uprintf("write_sectors: nSectors x SectorSize is too big\n");
return -1;
}
Size = (DWORD)(nSectors*SectorSize);
ptr.QuadPart = StartSector*SectorSize;
if(!SetFilePointerEx(hDrive, ptr, NULL, FILE_BEGIN))
{
uprintf("write_sectors: Could not access sector 0x%08llx - %s\n", StartSector, WindowsErrorString());
return -1;
}
if((!WriteFile(hDrive, pBuf, Size, &Size, NULL)) || (Size != nSectors*SectorSize))
{
uprintf("write_sectors: Write error %s\n", (GetLastError()!=ERROR_SUCCESS)?WindowsErrorString():"");
uprintf(" Wrote: %d, Expected: %lld\n", Size, nSectors*SectorSize);
uprintf(" StartSector: 0x%08llx, nSectors: 0x%llx, SectorSize: 0x%llx\n", StartSector, nSectors, SectorSize);
return Size;
}
return (int64_t)Size;
}
/* Returns the number of bytes read or -1 on error */
int64_t read_sectors(HANDLE hDrive, uint64_t SectorSize,
uint64_t StartSector, uint64_t nSectors,
void *pBuf)
{
LARGE_INTEGER ptr;
DWORD Size;
if((nSectors*SectorSize) > 0xFFFFFFFFUL)
{
uprintf("read_sectors: nSectors x SectorSize is too big\n");
return -1;
}
Size = (DWORD)(nSectors*SectorSize);
ptr.QuadPart = StartSector*SectorSize;
if(!SetFilePointerEx(hDrive, ptr, NULL, FILE_BEGIN))
{
uprintf("read_sectors: Could not access sector 0x%08llx - %s\n", StartSector, WindowsErrorString());
return -1;
}
if((!ReadFile(hDrive, pBuf, Size, &Size, NULL)) || (Size != nSectors*SectorSize))
{
uprintf("read_sectors: Read error %s\n", (GetLastError()!=ERROR_SUCCESS)?WindowsErrorString():"");
uprintf(" Read: %d, Expected: %lld\n", Size, nSectors*SectorSize);
uprintf(" StartSector: 0x%08llx, nSectors: 0x%llx, SectorSize: 0x%llx\n", StartSector, nSectors, SectorSize);
}
return (int64_t)Size;
}
/*
* The following calls use a bastardized fp on Windows that contains:
* fp->_ptr: a Windows handle
* fp->_bufsiz: the sector size
* fp->_cnt: a file offset
*/
int contains_data(FILE *fp, uint64_t Position,
const void *pData, uint64_t Len)
{
unsigned char aucBuf[MAX_DATA_LEN];
HANDLE hDrive = (HANDLE)fp->_ptr;
uint64_t SectorSize = (uint64_t)fp->_bufsiz;
uint64_t StartSector, EndSector, NumSectors;
Position += (uint64_t)fp->_cnt;
StartSector = Position/SectorSize;
EndSector = (Position+Len+SectorSize-1)/SectorSize;
NumSectors = (size_t)(EndSector - StartSector);
if((NumSectors*SectorSize) > MAX_DATA_LEN)
{
uprintf("contains_data: please increase MAX_DATA_LEN in file.h\n");
return 0;
}
if(Len > 0xFFFFFFFFUL)
{
uprintf("contains_data: Len is too big\n");
return 0;
}
if(read_sectors(hDrive, SectorSize, StartSector,
NumSectors, aucBuf) <= 0)
return 0;
if(memcmp(pData, &aucBuf[Position - StartSector*SectorSize], (size_t)Len))
return 0;
return 1;
} /* contains_data */
/* May read/write the same sector many times, but compatible with existing ms-sys */
int write_data(FILE *fp, uint64_t Position,
const void *pData, uint64_t Len)
{
unsigned char aucBuf[MAX_DATA_LEN];
HANDLE hDrive = (HANDLE)fp->_ptr;
uint64_t SectorSize = (uint64_t)fp->_bufsiz;
uint64_t StartSector, EndSector, NumSectors;
Position += (uint64_t)fp->_cnt;
StartSector = Position/SectorSize;
EndSector = (Position+Len+SectorSize-1)/SectorSize;
NumSectors = EndSector - StartSector;
if((NumSectors*SectorSize) > MAX_DATA_LEN)
{
uprintf("Please increase MAX_DATA_LEN in file.h\n");
return 0;
}
if(Len > 0xFFFFFFFFUL)
{
uprintf("write_data: Len is too big\n");
return 0;
}
/* Data to write may not be aligned on a sector boundary => read into a sector buffer first */
if(read_sectors(hDrive, SectorSize, StartSector,
NumSectors, aucBuf) <= 0)
return 0;
if(!memcpy(&aucBuf[Position - StartSector*SectorSize], pData, (size_t)Len))
return 0;
if(write_sectors(hDrive, SectorSize, StartSector,
NumSectors, aucBuf) <= 0)
return 0;
return 1;
} /* write_data */