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authorAnthony Liguori <aliguori@us.ibm.com>2009-05-09 17:14:19 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2009-05-14 16:13:46 -0500
commit019d6b8ff0d495ded6977f24a4e8fd1c7fec09e0 (patch)
treeffaf507f7440b5c7d8ed8a4de193b1df41e4a2d8 /block/parallels.c
parentConvert block infrastructure to use new module init functionality (diff)
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Move block drivers into their own directory
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'block/parallels.c')
-rw-r--r--block/parallels.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/block/parallels.c b/block/parallels.c
new file mode 100644
index 000000000..0b64a5c62
--- /dev/null
+++ b/block/parallels.c
@@ -0,0 +1,181 @@
+/*
+ * 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"
+#include "module.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);
+}
+
+static 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,
+};
+
+static void bdrv_parallels_init(void)
+{
+ bdrv_register(&bdrv_parallels);
+}
+
+block_init(bdrv_parallels_init);