const FOURK_SECTOR_SIZE = 4096

const SECTOR_SIZE = 512

const VHD_BLOCK_SIZE = 2 * 1024 * 1024 // 2MB

const VHD_COOKIE = "636f6e6563746978" // conectix

const VHD_CREATOR_APP = "676f2d766864" // go-vhd

const VHD_CREATOR_HOST_OS = "5769326B" // Win2k

const VHD_DYN_COOKIE = "6378737061727365" // cxsparse

const VHD_EXTRA_HEADER_SIZE = 1024

const VHD_HEADER_SIZE = 512

type VHD struct {
	Footer      VHDHeader
	ExtraHeader VHDExtraHeader
}

type VHDExtraHeader struct {
	Cookie              [8]byte
	DataOffset          [8]byte
	TableOffset         [8]byte
	HeaderVersion       [4]byte
	MaxTableEntries     [4]byte
	BlockSize           [4]byte
	Checksum            [4]byte
	ParentUUID          [16]byte
	ParentTimestamp     [4]byte
	Reserved            [4]byte
	ParentUnicodeName   [512]byte
	ParentLocatorEntry1 [24]byte
	ParentLocatorEntry2 [24]byte
	ParentLocatorEntry3 [24]byte
	ParentLocatorEntry4 [24]byte
	ParentLocatorEntry5 [24]byte
	ParentLocatorEntry6 [24]byte
	ParentLocatorEntry7 [24]byte
	ParentLocatorEntry8 [24]byte
	Reserved2           [256]byte
}

type VHDHeader struct {
	Cookie             [8]byte
	Features           [4]byte
	FileFormatVersion  [4]byte
	DataOffset         [8]byte
	Timestamp          [4]byte
	CreatorApplication [4]byte
	CreatorVersion     [4]byte
	CreatorHostOS      [4]byte
	OriginalSize       [8]byte
	CurrentSize        [8]byte
	DiskGeometry       [4]byte
	DiskType           [4]byte
	Checksum           [4]byte
	UniqueId           [16]byte
	SavedState         [1]byte
	Reserved           [427]byte
}

type VHDOptions struct {
	UUID      string
	Timestamp int64
}