Support offsets with io_raw too.
[lwext4.git] / blockdev / windows / io_raw.c
1 /*
2  * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * - Redistributions of source code must retain the above copyright
10  *   notice, this list of conditions and the following disclaimer.
11  * - Redistributions in binary form must reproduce the above copyright
12  *   notice, this list of conditions and the following disclaimer in the
13  *   documentation and/or other materials provided with the distribution.
14  * - The name of the author may not be used to endorse or promote products
15  *   derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28
29 #include <ext4_config.h>
30 #include <ext4_blockdev.h>
31 #include <ext4_errno.h>
32 #include <stdio.h>
33 #include <stdbool.h>
34 #include <string.h>
35
36 #ifdef WIN32
37 #include <windows.h>
38 #include <winioctl.h>
39
40 /**@brief   Default filename.*/
41 static const char *fname = "ext2";
42 static uint64_t offset = 0;
43
44 /**@brief   IO block size.*/
45 #define EXT4_IORAW_BSIZE 512
46
47 /**@brief   Image file descriptor.*/
48 static HANDLE dev_file;
49
50 /**********************BLOCKDEV INTERFACE**************************************/
51 static int io_raw_open(struct ext4_blockdev *bdev);
52 static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
53                         uint32_t blk_cnt);
54 static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
55                          uint64_t blk_id, uint32_t blk_cnt);
56 static int io_raw_close(struct ext4_blockdev *bdev);
57
58 /******************************************************************************/
59 EXT4_BLOCKDEV_STATIC_INSTANCE(_filedev, EXT4_IORAW_BSIZE, 0, io_raw_open,
60                               io_raw_bread, io_raw_bwrite, io_raw_close, 0, 0);
61
62 /******************************************************************************/
63 static int io_raw_open(struct ext4_blockdev *bdev)
64 {
65         char path[64];
66         DISK_GEOMETRY pdg;
67         uint64_t disk_size;
68         BOOL bResult = FALSE;
69         DWORD junk;
70
71         sprintf(path, "\\\\.\\%s", fname);
72
73         dev_file =
74             CreateFile(path, GENERIC_READ | GENERIC_WRITE,
75                        FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING,
76                        FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH, NULL);
77
78         if (dev_file == INVALID_HANDLE_VALUE) {
79                 return EIO;
80         }
81
82         bResult =
83             DeviceIoControl(dev_file, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
84                             &pdg, sizeof(pdg), &junk, (LPOVERLAPPED)NULL);
85
86         if (bResult == FALSE) {
87                 CloseHandle(dev_file);
88                 return EIO;
89         }
90
91         disk_size = pdg.Cylinders.QuadPart * (ULONG)pdg.TracksPerCylinder *
92                     (ULONG)pdg.SectorsPerTrack * (ULONG)pdg.BytesPerSector;
93
94         _filedev.bdif->ph_bsize = pdg.BytesPerSector;
95         _filedev.bdif->ph_bcnt = disk_size / pdg.BytesPerSector;
96
97         _filedev.part_offset = offset;
98         _filedev.part_size = disk_size;
99
100         return EOK;
101 }
102
103 /******************************************************************************/
104
105 static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
106                         uint32_t blk_cnt)
107 {
108         long hipart = blk_id >> (32 - 9);
109         long lopart = blk_id << 9;
110         long err;
111
112         SetLastError(0);
113         lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
114
115         if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
116                 return EIO;
117         }
118
119         DWORD n;
120
121         if (!ReadFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
122                 err = GetLastError();
123                 return EIO;
124         }
125         return EOK;
126 }
127
128 /******************************************************************************/
129 static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
130                          uint64_t blk_id, uint32_t blk_cnt)
131 {
132         long hipart = blk_id >> (32 - 9);
133         long lopart = blk_id << 9;
134         long err;
135
136         SetLastError(0);
137         lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
138
139         if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
140                 return EIO;
141         }
142
143         DWORD n;
144
145         if (!WriteFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
146                 err = GetLastError();
147                 return EIO;
148         }
149         return EOK;
150 }
151
152 /******************************************************************************/
153 static int io_raw_close(struct ext4_blockdev *bdev)
154 {
155         CloseHandle(dev_file);
156         return EOK;
157 }
158
159 /******************************************************************************/
160 struct ext4_blockdev *ext4_io_raw_dev_get(void) { return &_filedev; }
161 /******************************************************************************/
162 void ext4_io_raw_filename(const char *n) { fname = n; }
163 void ext4_io_raw_offset(uint64_t o) { offset = o; }
164
165 /******************************************************************************/
166 #endif