140 lines
3.6 KiB
Go
140 lines
3.6 KiB
Go
package column
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"reflect"
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"github.com/kshvakov/clickhouse/lib/binary"
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)
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const (
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UUIDLen = 16
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NullUUID = "00000000-0000-0000-0000-000000000000"
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)
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var ErrInvalidUUIDFormat = errors.New("invalid UUID format")
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type UUID struct {
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base
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scanType reflect.Type
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}
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func (*UUID) Read(decoder *binary.Decoder) (interface{}, error) {
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src, err := decoder.Fixed(UUIDLen)
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if err != nil {
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return "", err
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}
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src = swap(src)
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var uuid [36]byte
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{
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hex.Encode(uuid[:], src[:4])
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uuid[8] = '-'
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hex.Encode(uuid[9:13], src[4:6])
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uuid[13] = '-'
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hex.Encode(uuid[14:18], src[6:8])
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uuid[18] = '-'
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hex.Encode(uuid[19:23], src[8:10])
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uuid[23] = '-'
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hex.Encode(uuid[24:], src[10:])
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}
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return string(uuid[:]), nil
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}
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func (u *UUID) Write(encoder *binary.Encoder, v interface{}) (err error) {
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var uuid []byte
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switch v := v.(type) {
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case string:
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if uuid, err = uuid2bytes(v); err != nil {
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return err
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}
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case []byte:
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if len(v) != UUIDLen {
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return fmt.Errorf("invalid raw UUID len '%s' (expected %d, got %d)", uuid, UUIDLen, len(uuid))
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}
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uuid = make([]byte, 16)
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copy(uuid, v)
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default:
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return &ErrUnexpectedType{
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T: v,
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Column: u,
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}
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}
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uuid = swap(uuid)
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if _, err := encoder.Write(uuid); err != nil {
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return err
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}
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return nil
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}
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func swap(src []byte) []byte {
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_ = src[15]
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src[0], src[7] = src[7], src[0]
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src[1], src[6] = src[6], src[1]
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src[2], src[5] = src[5], src[2]
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src[3], src[4] = src[4], src[3]
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src[8], src[15] = src[15], src[8]
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src[9], src[14] = src[14], src[9]
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src[10], src[13] = src[13], src[10]
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src[11], src[12] = src[12], src[11]
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return src
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}
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func uuid2bytes(str string) ([]byte, error) {
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var uuid [16]byte
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strLength := len(str)
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if strLength == 0 {
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str = NullUUID
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} else if strLength != 36 {
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return nil, ErrInvalidUUIDFormat
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}
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if str[8] != '-' || str[13] != '-' || str[18] != '-' || str[23] != '-' {
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return nil, ErrInvalidUUIDFormat
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}
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for i, x := range [16]int{
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0, 2, 4, 6,
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9, 11, 14, 16,
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19, 21, 24, 26,
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28, 30, 32, 34,
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} {
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if v, ok := xtob(str[x], str[x+1]); !ok {
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return nil, ErrInvalidUUIDFormat
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} else {
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uuid[i] = v
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}
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}
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return uuid[:], nil
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}
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// xvalues returns the value of a byte as a hexadecimal digit or 255.
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var xvalues = [256]byte{
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255, 255, 255, 255,
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255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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}
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// xtob converts hex characters x1 and x2 into a byte.
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func xtob(x1, x2 byte) (byte, bool) {
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b1 := xvalues[x1]
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b2 := xvalues[x2]
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return (b1 << 4) | b2, b1 != 255 && b2 != 255
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}
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