diff options
Diffstat (limited to 'block-vpc.c')
| -rw-r--r-- | block-vpc.c | 118 |
1 files changed, 82 insertions, 36 deletions
diff --git a/block-vpc.c b/block-vpc.c index 0b4666d35f..3f257859a7 100644 --- a/block-vpc.c +++ b/block-vpc.c @@ -30,41 +30,87 @@ //#define CACHE +enum vhd_type { + VHD_FIXED = 2, + VHD_DYNAMIC = 3, + VHD_DIFFERENCING = 4, +}; + // always big-endian struct vhd_footer { - char creator[8]; // "conectix - uint32_t unk1[2]; - uint32_t unk2; // always zero? - uint32_t subheader_offset; - uint32_t unk3; // some size? - char creator_app[4]; // "vpc " - uint16_t major; - uint16_t minor; - char guest[4]; // "Wi2k" - uint32_t unk4[7]; - uint8_t vnet_id[16]; // virtual network id, purpose unknown - // next 16 longs are used, but dunno the purpose - // next 6 longs unknown, following 7 long maybe a serial + char creator[8]; // "conectix" + uint32_t features; + uint32_t version; + + // Offset of next header structure, 0xFFFFFFFF if none + uint64_t data_offset; + + // Seconds since Jan 1, 2000 0:00:00 (UTC) + uint32_t timestamp; + + char creator_app[4]; // "vpc " + uint16_t major; + uint16_t minor; + char creator_os[4]; // "Wi2k" + + uint64_t orig_size; + uint64_t size; + + uint16_t cyls; + uint8_t heads; + uint8_t secs_per_cyl; + + uint32_t type; + + // Checksum of the Hard Disk Footer ("one's complement of the sum of all + // the bytes in the footer without the checksum field") + uint32_t checksum; + + // UUID used to identify a parent hard disk (backing file) + uint8_t uuid[16]; + + uint8_t in_saved_state; }; struct vhd_dyndisk_header { - char magic[8]; // "cxsparse" - uint32_t unk1[2]; // all bits set - uint32_t unk2; // always zero? - uint32_t pagetable_offset; - uint32_t unk3; - uint32_t pagetable_entries; // 32bit/entry - uint32_t pageentry_size; // 512*8*512 - uint32_t nb_sectors; + char magic[8]; // "cxsparse" + + // Offset of next header structure, 0xFFFFFFFF if none + uint64_t data_offset; + + // Offset of the Block Allocation Table (BAT) + uint64_t table_offset; + + uint32_t version; + uint32_t max_table_entries; // 32bit/entry + + // 2 MB by default, must be a power of two + uint32_t block_size; + + uint32_t checksum; + uint8_t parent_uuid[16]; + uint32_t parent_timestamp; + uint32_t reserved; + + // Backing file name (in UTF-16) + uint8_t parent_name[512]; + + struct { + uint32_t platform; + uint32_t data_space; + uint32_t data_length; + uint32_t reserved; + uint64_t data_offset; + } parent_locator[8]; }; typedef struct BDRVVPCState { int fd; - int pagetable_entries; + int max_table_entries; uint32_t *pagetable; - uint32_t pageentry_size; + uint32_t block_size; #ifdef CACHE uint8_t *pageentry_u8; uint32_t *pageentry_u32; @@ -104,7 +150,7 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags) if (strncmp(footer->creator, "conectix", 8)) goto fail; - lseek(s->fd, be32_to_cpu(footer->subheader_offset), SEEK_SET); + lseek(s->fd, be64_to_cpu(footer->data_offset), SEEK_SET); if (read(fd, buf, HEADER_SIZE) != HEADER_SIZE) goto fail; @@ -114,22 +160,22 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags) if (strncmp(dyndisk_header->magic, "cxsparse", 8)) goto fail; - bs->total_sectors = ((uint64_t)be32_to_cpu(dyndisk_header->pagetable_entries) * - be32_to_cpu(dyndisk_header->pageentry_size)) / 512; + bs->total_sectors = ((uint64_t)be32_to_cpu(dyndisk_header->max_table_entries) * + be32_to_cpu(dyndisk_header->block_size)) / 512; - lseek(s->fd, be32_to_cpu(dyndisk_header->pagetable_offset), SEEK_SET); + lseek(s->fd, be64_to_cpu(dyndisk_header->table_offset), SEEK_SET); - s->pagetable_entries = be32_to_cpu(dyndisk_header->pagetable_entries); - s->pagetable = qemu_malloc(s->pagetable_entries * 4); + s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); + s->pagetable = qemu_malloc(s->max_table_entries * 4); if (!s->pagetable) goto fail; - if (read(s->fd, s->pagetable, s->pagetable_entries * 4) != - s->pagetable_entries * 4) + if (read(s->fd, s->pagetable, s->max_table_entries * 4) != + s->max_table_entries * 4) goto fail; - for (i = 0; i < s->pagetable_entries; i++) + for (i = 0; i < s->max_table_entries; i++) be32_to_cpus(&s->pagetable[i]); - s->pageentry_size = be32_to_cpu(dyndisk_header->pageentry_size); + s->block_size = be32_to_cpu(dyndisk_header->block_size); #ifdef CACHE s->pageentry_u8 = qemu_malloc(512); if (!s->pageentry_u8) @@ -152,10 +198,10 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num) uint64_t bitmap_offset, block_offset; uint32_t pagetable_index, pageentry_index; - pagetable_index = offset / s->pageentry_size; - pageentry_index = (offset % s->pageentry_size) / 512; + pagetable_index = offset / s->block_size; + pageentry_index = (offset % s->block_size) / 512; - if (pagetable_index > s->pagetable_entries || s->pagetable[pagetable_index] == 0xffffffff) + if (pagetable_index > s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) return -1; // not allocated bitmap_offset = 512 * s->pagetable[pagetable_index]; |