Merge branch 'master' of /home/nchip/public_html/qemu into garage-push

[qemu] / block / parallels.c

diff --git a/block/parallels.c b/block/parallels.c
new file mode 100644 (file)
index 0000000..0b64a5c
--- /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);