package uuid
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import (
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"bytes"
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"crypto/rand"
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"encoding/hex"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/errors"
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)
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var byteGroups = []int{8, 4, 4, 4, 12}
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type UUID [16]byte
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// String returns the string representation of this UUID.
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func (u *UUID) String() string {
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bytes := u.Bytes()
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result := hex.EncodeToString(bytes[0 : byteGroups[0]/2])
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start := byteGroups[0] / 2
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for i := 1; i < len(byteGroups); i++ {
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nBytes := byteGroups[i] / 2
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result += "-"
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result += hex.EncodeToString(bytes[start : start+nBytes])
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start += nBytes
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}
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return result
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}
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// Bytes returns the bytes representation of this UUID.
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func (u *UUID) Bytes() []byte {
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return u[:]
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}
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// Equals returns true if this UUID equals another UUID by value.
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func (u *UUID) Equals(another *UUID) bool {
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if u == nil && another == nil {
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return true
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}
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if u == nil || another == nil {
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return false
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}
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return bytes.Equal(u.Bytes(), another.Bytes())
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}
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// New creates a UUID with random value.
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func New() UUID {
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var uuid UUID
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common.Must2(rand.Read(uuid.Bytes()))
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return uuid
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}
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// ParseBytes converts a UUID in byte form to object.
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func ParseBytes(b []byte) (UUID, error) {
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var uuid UUID
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if len(b) != 16 {
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return uuid, errors.New("invalid UUID: ", b)
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}
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copy(uuid[:], b)
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return uuid, nil
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}
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// ParseString converts a UUID in string form to object.
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func ParseString(str string) (UUID, error) {
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var uuid UUID
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text := []byte(str)
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if len(text) < 32 {
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return uuid, errors.New("invalid UUID: ", str)
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}
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b := uuid.Bytes()
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for _, byteGroup := range byteGroups {
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if text[0] == '-' {
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text = text[1:]
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}
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if _, err := hex.Decode(b[:byteGroup/2], text[:byteGroup]); err != nil {
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return uuid, err
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}
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text = text[byteGroup:]
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b = b[byteGroup/2:]
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}
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return uuid, nil
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}
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