func DecodeLabelTKey(tk storage.TKey) (label uint64, err error) {
ibytes, err := tk.ClassBytes(keyLabel)
if err != nil {
return
}
label = binary.BigEndian.Uint64(ibytes[0:8])
return
}
// DecodeSizeLabelTKey returns a size and a label from a size+label key component.
func DecodeSizeLabelTKey(tk storage.TKey) (label, size uint64, err error) {
ibytes, err := tk.ClassBytes(keySizeLabel)
if err != nil {
return
}
size = binary.BigEndian.Uint64(ibytes[0:8])
label = binary.BigEndian.Uint64(ibytes[8:16])
return
}
// DecodeTKey returns a label and block index bytes from a label block RLE key.
// The block index bytes are returned because different block indices may be used (e.g., CZYX),
// and its up to caller to determine which one is used for this particular key.
func DecodeTKey(tk storage.TKey) (label uint64, block dvid.IZYXString, err error) {
ibytes, err := tk.ClassBytes(keyLabelBlockRLE)
if err != nil {
return
}
label = binary.BigEndian.Uint64(ibytes[0:8])
block = dvid.IZYXString(ibytes[8:])
return
}
// DecodeTKey returns a spatial index from a image block key.
// TODO: Extend this when necessary to allow any form of spatial indexing like CZYX.
func DecodeTKey(tk storage.TKey) (*dvid.IndexZYX, error) {
ibytes, err := tk.ClassBytes(keyImageBlock)
if err != nil {
return nil, err
}
var zyx dvid.IndexZYX
if err = zyx.IndexFromBytes(ibytes); err != nil {
return nil, fmt.Errorf("Cannot recover ZYX index from image block key %v: %v\n", tk, err)
}
return &zyx, nil
}
func DecodeBlockTKey(tk storage.TKey) (pt dvid.ChunkPoint3d, err error) {
ibytes, err := tk.ClassBytes(keyBlock)
if err != nil {
return
}
var idx dvid.IndexZYX
if err = idx.IndexFromBytes(ibytes); err != nil {
return
}
pt = dvid.ChunkPoint3d(idx)
return
}
// DecodeTypeLabelTKey decodes a type-specific key into a (index type, label) tuple.
func DecodeTypeLabelTKey(tk storage.TKey) (i IndexType, label uint64, err error) {
var ibytes []byte
ibytes, err = tk.ClassBytes(keyTypeLabel)
if err != nil {
return
}
if len(ibytes) != 9 {
err = fmt.Errorf("labelsz label size type-specific key is wrong size: expected 9, got %d bytes", len(ibytes))
return
}
i = IndexType(ibytes[0])
label = binary.BigEndian.Uint64(ibytes[1:])
return
}
// DecodeTKey returns the string key used for this keyvalue.
func DecodeTKey(tk storage.TKey) (string, error) {
ibytes, err := tk.ClassBytes(keyStandard)
if err != nil {
return "", err
}
sz := len(ibytes) - 1
if sz <= 0 {
return "", fmt.Errorf("empty key")
}
if ibytes[sz] != 0 {
return "", fmt.Errorf("expected 0 byte ending key of keyvalue key, got %d", ibytes[sz])
}
return string(ibytes[:sz]), nil
}
// DecodeTagTKey returns the Tag corresponding to this type-specific key.
func DecodeTagTKey(tk storage.TKey) (Tag, error) {
ibytes, err := tk.ClassBytes(keyTag)
if err != nil {
return "", err
}
sz := len(ibytes) - 1
if sz <= 0 {
return "", fmt.Errorf("empty tag")
}
if ibytes[sz] != 0 {
return "", fmt.Errorf("expected 0 byte ending tag key, got %d", ibytes[sz])
}
return Tag(ibytes[:sz]), nil
}
// DecodeTypeSizeLabelTKey decodes a type-specific key into a (index type, size, label) tuple.
func DecodeTypeSizeLabelTKey(tk storage.TKey) (i IndexType, sz uint32, label uint64, err error) {
var ibytes []byte
ibytes, err = tk.ClassBytes(keyTypeSizeLabel)
if err != nil {
return
}
if len(ibytes) != 13 {
err = fmt.Errorf("labelsz element size type-specific key is wrong size: expected 13, got %d bytes", len(ibytes))
return
}
i = IndexType(ibytes[0])
sz = math.MaxUint32 - binary.BigEndian.Uint32(ibytes[1:5])
label = binary.BigEndian.Uint64(ibytes[5:])
return
}