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