Archipelago » qemu

/*

   vmdk2raw: convert vmware images to raw disk images

   Copyright (C) Net Integration Technologies 2004

   Copyright (C) Matthew Chapman 2003

   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 <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <fcntl.h>

#include <inttypes.h>

#include <sys/types.h>

#include <string.h>

#include <sys/stat.h>

#include <errno.h>

#include "vmdk.h"

#include "config-host.h"

struct cowdisk_header header;

struct cowdisk_header2 header2;

off_t disk_base, disk_limit;

unsigned int granule_size;

uint32_t l1dir[L1_SIZE];

unsigned int cached_l2dir;

uint32_t l2dir[L2_SIZE];

size_t read_physical(int fd, off64_t offset, size_t length, void *buffer)

{

    size_t n;

    if (lseek64(fd, offset, SEEK_SET) == -1)

    {

        perror("lseek");

        return -1;

    }

    n = read(fd, buffer, length);

    if (n == -1)

    {

        perror("read from disk");

        return -1;

    }

    return n;

}

size_t copy_virtual(int in_fd, int out_fd, off64_t offset, void *buffer, size_t length)

{

    unsigned int granule_index, granule_offset;

    unsigned int l1index, l2index;

    granule_index = offset / granule_size;

    granule_offset = offset % granule_size;

    length = MIN(length, granule_size - granule_offset);

    length = MIN(length, disk_limit - offset);

    l1index = (granule_index >> L2_BITS) & L1_MASK;

    l2index = granule_index & L2_MASK;

    if (l1dir[l1index] == 0)

        goto zero_fill;

    if (l1index != cached_l2dir)

    {

        if (read_physical(in_fd, (l1dir[l1index] << SECTOR_BITS), sizeof(l2dir), (char *)l2dir) != sizeof(l2dir))

            return 0;

        cached_l2dir = l1index;

    }

    if (l2dir[l2index] == 0)

        goto zero_fill;

    if (read_physical(in_fd, (l2dir[l2index] << SECTOR_BITS) + granule_offset, length, buffer) != length)

        return 0;

    write(out_fd, buffer, length);

    return length;

zero_fill:

    /* the last chunk of the file can not be sparse

     * or the file will be truncated */

    if (offset + length < disk_limit) {

        memset(buffer, 0, length);

        write(out_fd, buffer, length);

    } else {

        if (lseek(out_fd, length, SEEK_CUR) == (off_t)-1)

            perror("lseek");

    }

    return length;

}

int open_vmdk(const char *filename)

{

    int fd = open(filename, O_RDONLY | O_LARGEFILE);

    if (fd == -1)

    {

        perror(filename);

        return -1;

    }

    if (read(fd, &header, sizeof(header)) != sizeof(header))

    {

        perror("read from disk");

        return -1;

    }

    if (memcmp(header.magic, "COWD", 4) != 0)

    {

        fprintf(stderr, "%s is not a VMware virtual disk image\n", filename);

        return -1;

    }

    granule_size = header.granularity << SECTOR_BITS;

    if (read_physical(fd, header.l1dir_sector << SECTOR_BITS, sizeof(l1dir), (char *)l1dir) != sizeof(l1dir))

        return -1;

    disk_limit = header.disk_sectors << SECTOR_BITS;

    cached_l2dir = -1;

    return fd;

}

void help(void)

{

    printf("vmdk2raw\n"

           "usage: vmdk2raw vmware_image output_image\n"

           "\n"

           "vmware_image   a vmware 2.x/3.x cow image\n"

           "output_image   the created disk image\n" 

          );

    exit(1);

}

#define BUF_SIZE granule_size

void copy_disk(in_fd, out_fd)

{

    char buf[BUF_SIZE];

    off64_t i = 0;

    while (i < disk_limit) {

        i += copy_virtual(in_fd, out_fd, i, buf, sizeof(buf));

    }

}

int main(int argc, char **argv)

{

    int out_fd, in_fd;

    if (argc < 3)

        help();

    in_fd = open_vmdk(argv[1]);

    if (in_fd < 0) {

        return -1;

    }

    out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);

    if (out_fd < 0) {

        perror(argv[2]);

        return -1;

    }

    copy_disk(in_fd, out_fd);

    close(out_fd);

    return 0;

}