ref: d50817eb368e41137c872ddc02b3653c3209f8d9
dir: /blockdev/windows/io_raw.c/
/*
* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <ext4_config.h>
#include <ext4_blockdev.h>
#include <ext4_errno.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#ifdef WIN32
#include <windows.h>
#include <winioctl.h>
/**@brief Default filename.*/
static const char *fname = "ext2";
/**@brief IO block size.*/
#define EXT4_IORAW_BSIZE 512
/**@brief Image file descriptor.*/
static HANDLE dev_file;
/**********************BLOCKDEV INTERFACE**************************************/
static int io_raw_open(struct ext4_blockdev *bdev);
static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
uint32_t blk_cnt);
static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
uint64_t blk_id, uint32_t blk_cnt);
static int io_raw_close(struct ext4_blockdev *bdev);
/******************************************************************************/
EXT4_BLOCKDEV_STATIC_INSTANCE(_filedev, EXT4_IORAW_BSIZE, 0, io_raw_open,
io_raw_bread, io_raw_bwrite, io_raw_close, 0, 0);
/******************************************************************************/
static int io_raw_open(struct ext4_blockdev *bdev)
{
char path[64];
DISK_GEOMETRY pdg;
uint64_t disk_size;
BOOL bResult = FALSE;
DWORD junk;
sprintf(path, "\\\\.\\%s", fname);
dev_file =
CreateFile(path, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH, NULL);
if (dev_file == INVALID_HANDLE_VALUE) {
return EIO;
}
bResult =
DeviceIoControl(dev_file, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
&pdg, sizeof(pdg), &junk, (LPOVERLAPPED)NULL);
if (bResult == FALSE) {
CloseHandle(dev_file);
return EIO;
}
disk_size = pdg.Cylinders.QuadPart * (ULONG)pdg.TracksPerCylinder *
(ULONG)pdg.SectorsPerTrack * (ULONG)pdg.BytesPerSector;
_filedev.bdif->ph_bsize = pdg.BytesPerSector;
_filedev.bdif->ph_bcnt = disk_size / pdg.BytesPerSector;
_filedev.part_offset = 0;
_filedev.part_size = disk_size;
return EOK;
}
/******************************************************************************/
static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
uint32_t blk_cnt)
{
long hipart = blk_id >> (32 - 9);
long lopart = blk_id << 9;
long err;
SetLastError(0);
lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
return EIO;
}
DWORD n;
if (!ReadFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
err = GetLastError();
return EIO;
}
return EOK;
}
/******************************************************************************/
static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
uint64_t blk_id, uint32_t blk_cnt)
{
long hipart = blk_id >> (32 - 9);
long lopart = blk_id << 9;
long err;
SetLastError(0);
lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
return EIO;
}
DWORD n;
if (!WriteFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
err = GetLastError();
return EIO;
}
return EOK;
}
/******************************************************************************/
static int io_raw_close(struct ext4_blockdev *bdev)
{
CloseHandle(dev_file);
return EOK;
}
/******************************************************************************/
struct ext4_blockdev *ext4_io_raw_dev_get(void) { return &_filedev; }
/******************************************************************************/
void ext4_io_raw_filename(const char *n) { fname = n; }
/******************************************************************************/
#endif