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86 lines
1.4 KiB
86 lines
1.4 KiB
package uuid
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import (
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"crypto/rand"
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"encoding/hex"
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"errors"
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)
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var (
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byteGroups = []int{8, 4, 4, 4, 12}
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InvalidID = errors.New("Invalid ID.")
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)
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type UUID struct {
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byteValue []byte
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stringValue string
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}
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func (this *UUID) String() string {
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return this.stringValue
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}
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func (this *UUID) Bytes() []byte {
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return this.byteValue[:]
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}
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func bytesToString(bytes []byte) string {
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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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func New() *UUID {
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bytes := make([]byte, 16)
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rand.Read(bytes)
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uuid, _ := ParseBytes(bytes)
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return uuid
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}
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func ParseBytes(bytes []byte) (*UUID, error) {
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if len(bytes) != 16 {
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return nil, InvalidID
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}
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return &UUID{
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byteValue: bytes,
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stringValue: bytesToString(bytes),
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}, nil
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}
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func ParseString(str string) (*UUID, error) {
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text := []byte(str)
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if len(text) < 32 {
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return nil, InvalidID
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}
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uuid := &UUID{
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byteValue: make([]byte, 16),
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stringValue: str,
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}
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b := uuid.byteValue[:]
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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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_, err := hex.Decode(b[:byteGroup/2], text[:byteGroup])
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if err != nil {
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return nil, 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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