diff options
Diffstat (limited to 'block-parallels.c')
| -rw-r--r-- | block-parallels.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/block-parallels.c b/block-parallels.c new file mode 100644 index 0000000000..b0fb99cee2 --- /dev/null +++ b/block-parallels.c @@ -0,0 +1,176 @@ +/* + * 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 "vl.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 (!s->catalog_bitmap) + goto fail; + 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 = { + "parallels", + sizeof(BDRVParallelsState), + parallels_probe, + parallels_open, + parallels_read, + NULL, + parallels_close, +}; |