qemu/block-parallels.c
aurel32 e60f469ca8 Use C99 initializers for BlockDriver methods
Consistently use the C99 named initializer format for the BlockDriver
methods to make the method table more readable and more easily
extensible.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6768 c046a42c-6fe2-441c-8c8c-71466251a162
2009-03-07 22:00:29 +00:00

174 lines
4.7 KiB
C

/*
* Block driver for Parallels disk image format
*
* Copyright (c) 2007 Alex Beregszaszi
*
* This code is based on comparing different disk images created by Parallels.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "block_int.h"
/**************************************************************/
#define HEADER_MAGIC "WithoutFreeSpace"
#define HEADER_VERSION 2
#define HEADER_SIZE 64
// always little-endian
struct parallels_header {
char magic[16]; // "WithoutFreeSpace"
uint32_t version;
uint32_t heads;
uint32_t cylinders;
uint32_t tracks;
uint32_t catalog_entries;
uint32_t nb_sectors;
char padding[24];
} __attribute__((packed));
typedef struct BDRVParallelsState {
int fd;
uint32_t *catalog_bitmap;
int catalog_size;
int tracks;
} BDRVParallelsState;
static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const struct parallels_header *ph = (const void *)buf;
if (buf_size < HEADER_SIZE)
return 0;
if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
(le32_to_cpu(ph->version) == HEADER_VERSION))
return 100;
return 0;
}
static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVParallelsState *s = bs->opaque;
int fd, i;
struct parallels_header ph;
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
if (fd < 0) {
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return -1;
}
bs->read_only = 1; // no write support yet
s->fd = fd;
if (read(fd, &ph, sizeof(ph)) != sizeof(ph))
goto fail;
if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
(le32_to_cpu(ph.version) != HEADER_VERSION)) {
goto fail;
}
bs->total_sectors = le32_to_cpu(ph.nb_sectors);
if (lseek(s->fd, 64, SEEK_SET) != 64)
goto fail;
s->tracks = le32_to_cpu(ph.tracks);
s->catalog_size = le32_to_cpu(ph.catalog_entries);
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
s->catalog_size * 4)
goto fail;
for (i = 0; i < s->catalog_size; i++)
le32_to_cpus(&s->catalog_bitmap[i]);
return 0;
fail:
if (s->catalog_bitmap)
qemu_free(s->catalog_bitmap);
close(fd);
return -1;
}
static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
{
BDRVParallelsState *s = bs->opaque;
uint32_t index, offset, position;
index = sector_num / s->tracks;
offset = sector_num % s->tracks;
// not allocated
if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
return -1;
position = (s->catalog_bitmap[index] + offset) * 512;
// fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
// sector_num, index, offset, s->catalog_bitmap[index], position);
if (lseek(s->fd, position, SEEK_SET) != position)
return -1;
return 0;
}
static int parallels_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVParallelsState *s = bs->opaque;
while (nb_sectors > 0) {
if (!seek_to_sector(bs, sector_num)) {
if (read(s->fd, buf, 512) != 512)
return -1;
} else
memset(buf, 0, 512);
nb_sectors--;
sector_num++;
buf += 512;
}
return 0;
}
static void parallels_close(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
qemu_free(s->catalog_bitmap);
close(s->fd);
}
BlockDriver bdrv_parallels = {
.format_name = "parallels",
.instance_size = sizeof(BDRVParallelsState),
.bdrv_probe = parallels_probe,
.bdrv_open = parallels_open,
.bdrv_read = parallels_read,
.bdrv_close = parallels_close,
};