2 vmdk2raw: convert vmware images to raw disk images
3 Copyright (C) Net Integration Technologies 2004
4 Copyright (C) Matthew Chapman 2003
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <sys/types.h>
31 #include "config-host.h"
33 struct cowdisk_header header;
34 struct cowdisk_header2 header2;
35 off_t disk_base, disk_limit;
36 unsigned int granule_size;
37 uint32_t l1dir[L1_SIZE];
39 unsigned int cached_l2dir;
40 uint32_t l2dir[L2_SIZE];
42 size_t read_physical(int fd, off64_t offset, size_t length, void *buffer)
46 if (lseek64(fd, offset, SEEK_SET) == -1)
52 n = read(fd, buffer, length);
55 perror("read from disk");
62 size_t copy_virtual(int in_fd, int out_fd, off64_t offset, void *buffer, size_t length)
64 unsigned int granule_index, granule_offset;
65 unsigned int l1index, l2index;
67 granule_index = offset / granule_size;
68 granule_offset = offset % granule_size;
69 length = MIN(length, granule_size - granule_offset);
70 length = MIN(length, disk_limit - offset);
72 l1index = (granule_index >> L2_BITS) & L1_MASK;
73 l2index = granule_index & L2_MASK;
75 if (l1dir[l1index] == 0)
78 if (l1index != cached_l2dir)
80 if (read_physical(in_fd, (l1dir[l1index] << SECTOR_BITS), sizeof(l2dir), (char *)l2dir) != sizeof(l2dir))
83 cached_l2dir = l1index;
86 if (l2dir[l2index] == 0)
89 if (read_physical(in_fd, (l2dir[l2index] << SECTOR_BITS) + granule_offset, length, buffer) != length)
92 write(out_fd, buffer, length);
96 /* the last chunk of the file can not be sparse
97 * or the file will be truncated */
98 if (offset + length < disk_limit) {
99 memset(buffer, 0, length);
100 write(out_fd, buffer, length);
102 if (lseek(out_fd, length, SEEK_CUR) == (off_t)-1)
109 int open_vmdk(const char *filename)
111 int fd = open(filename, O_RDONLY | O_LARGEFILE);
118 if (read(fd, &header, sizeof(header)) != sizeof(header))
120 perror("read from disk");
124 if (memcmp(header.magic, "COWD", 4) != 0)
126 fprintf(stderr, "%s is not a VMware virtual disk image\n", filename);
130 granule_size = header.granularity << SECTOR_BITS;
131 if (read_physical(fd, header.l1dir_sector << SECTOR_BITS, sizeof(l1dir), (char *)l1dir) != sizeof(l1dir))
134 disk_limit = header.disk_sectors << SECTOR_BITS;
143 "usage: vmdk2raw vmware_image output_image\n"
145 "vmware_image a vmware 2.x/3.x cow image\n"
146 "output_image the created disk image\n"
151 #define BUF_SIZE granule_size
152 void copy_disk(in_fd, out_fd)
156 while (i < disk_limit) {
157 i += copy_virtual(in_fd, out_fd, i, buf, sizeof(buf));
161 int main(int argc, char **argv)
168 in_fd = open_vmdk(argv[1]);
173 out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
179 copy_disk(in_fd, out_fd);