qcow2

const (
	// AutoclearBitmaps is the bitmaps extension bit. This bit indicates
	// consistency for the bitmaps extension data.
	AutoclearBitmaps AutoclearFeatures = 1 << 0
	// AutoclearRaw is the raw external data bit. If this bit is set,
	// the external data file can be read as a consistent standalone raw image
	// without looking at the qcow2 metadata.
	AutoclearRaw AutoclearFeatures = 1 << 1
)

const (
	// CompatibleLazyRefcounts is the lazy refcounts bit. If this bit is set then
	// lazy refcount updates can be used. This means marking the image file dirty
	// and postponing refcount metadata updates.
	CompatibleLazyRefcounts CompatibleFeatures = 1 << 0
)

const (
	// CompressionTypeDeflate is the deflate compression type.
	CompressionTypeDeflate CompressionType = 0
	// CompressionTypeZstd is the zstd compression type.
	CompressionTypeZstd CompressionType = 1
)

const (
	NoEncryption  EncryptionMethod = 0
	AesEncryption EncryptionMethod = 1
)

const (
	// EndOfHeaderExtensionArea is the end of the header extension area.
	EndOfHeaderExtensionArea HeaderExtensionType = 0x00000000
	// BackingFileFormatName is the backing file format name string.
	BackingFileFormatName HeaderExtensionType = 0xe2792aca
	// FeatureNameTable is the feature name table.
	FeatureNameTable HeaderExtensionType = 0x6803f857
	// BitmapsExtension is the bitmaps extension.
	BitmapsExtension HeaderExtensionType = 0x23852875
	// FullDiskEncryptionHeader is the full disk encryption header pointer.
	FullDiskEncryptionHeader HeaderExtensionType = 0x0537be77
	// ExternalDataFileName is the external data file name string.
	ExternalDataFileName HeaderExtensionType = 0x44415441
)

const (
	// IncompatibleDirty is the dirty bit. If this bit is set then refcounts may be
	// inconsistent, make sure to scan L1/L2 tables to repair refcounts before
	// accessing the image.
	IncompatibleDirty IncompatibleFeatures = 1 << 0
	// IncompatibleCorrupt is the corrupt bit. If this bit is set then any data
	// structure may be corrupt and the image must not be written to (unless for
	// regaining consistency).
	IncompatibleCorrupt IncompatibleFeatures = 1 << 1
	// IncompatibleExternalData is the external data file bit. If this bit is set, an
	// external data file is used. Guest clusters are then stored in the external
	// data file. For such images, clusters in the external data file are not
	// refcounted.
	IncompatibleExternalData IncompatibleFeatures = 1 << 2
	// IncompatibleExtendedL2 is the extended L2 entries bit. If this bit is set then
	// L2 table entries use an extended format that allows subcluster-based
	// allocation.
	IncompatibleExtendedL2 IncompatibleFeatures = 1 << 3
)

const (
	RefcountOrder16 RefcountOrder = 4
	RefcountOrder32 RefcountOrder = 5
	RefcountOrder64 RefcountOrder = 6
)

const (
	// Version3 is the QCOW version 3.
	// Only version 3 is supported by this library.
	Version3 Version = 3
)