static int vmdk_open_vmdk4(BlockDriverState *bs, BlockDriverState *file, int flags) { int ret; uint32_t magic; uint32_t l1_size, l1_entry_sectors; VMDK4Header header; VmdkExtent *extent; int64_t l1_backup_offset = 0; ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); if (ret < 0) { return ret; } if (header.capacity == 0) { int64_t desc_offset = le64_to_cpu(header.desc_offset); if (desc_offset) { return vmdk_open_desc_file(bs, flags, desc_offset << 9); } } if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { /* * The footer takes precedence over the header, so read it in. The * footer starts at offset -1024 from the end: One sector for the * footer, and another one for the end-of-stream marker. */ struct { struct { uint64_t val; uint32_t size; uint32_t type; uint8_t pad[512 - 16]; } QEMU_PACKED footer_marker; uint32_t magic; VMDK4Header header; uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; struct { uint64_t val; uint32_t size; uint32_t type; uint8_t pad[512 - 16]; } QEMU_PACKED eos_marker; } QEMU_PACKED footer; ret = bdrv_pread(file, bs->file->total_sectors * 512 - 1536, &footer, sizeof(footer)); if (ret < 0) { return ret; } /* Some sanity checks for the footer */ if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || le32_to_cpu(footer.footer_marker.size) != 0 || le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || le64_to_cpu(footer.eos_marker.val) != 0 || le32_to_cpu(footer.eos_marker.size) != 0 || le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) { return -EINVAL; } header = footer.header; } if (le32_to_cpu(header.version) >= 3) { char buf[64]; snprintf(buf, sizeof(buf), "VMDK version %d", le32_to_cpu(header.version)); qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, bs->device_name, "vmdk", buf); return -ENOTSUP; } l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) * le64_to_cpu(header.granularity); if (l1_entry_sectors == 0) { return -EINVAL; } l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) / l1_entry_sectors; if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; } extent = vmdk_add_extent(bs, file, false, le64_to_cpu(header.capacity), le64_to_cpu(header.gd_offset) << 9, l1_backup_offset, l1_size, le32_to_cpu(header.num_gtes_per_gte), le64_to_cpu(header.granularity)); extent->compressed = le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; extent->version = le32_to_cpu(header.version); extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; ret = vmdk_init_tables(bs, extent); if (ret) { /* free extent allocated by vmdk_add_extent */ vmdk_free_last_extent(bs); } return ret; }