104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
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package uuid
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/****************
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* Date: 31/01/14
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* Time: 3:34 PM
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***************/
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import "net"
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// Struct is used for RFC4122 Version 1 UUIDs
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type Struct struct {
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timeLow uint32
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timeMid uint16
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timeHiAndVersion uint16
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sequenceHiAndVariant byte
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sequenceLow byte
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node []byte
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size int
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}
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func (o Struct) Size() int {
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return o.size
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}
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func (o Struct) Version() int {
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return int(o.timeHiAndVersion >> 12)
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}
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func (o Struct) Variant() byte {
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return variant(o.sequenceHiAndVariant)
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}
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// Sets the four most significant bits (bits 12 through 15) of the
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// timeHiAndVersion field to the 4-bit version number.
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func (o *Struct) setVersion(pVersion int) {
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o.timeHiAndVersion &= 0x0FFF
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o.timeHiAndVersion |= (uint16(pVersion) << 12)
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}
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func (o *Struct) setVariant(pVariant byte) {
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setVariant(&o.sequenceHiAndVariant, pVariant)
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}
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func (o *Struct) Unmarshal(pData []byte) {
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o.timeLow = uint32(pData[3]) | uint32(pData[2])<<8 | uint32(pData[1])<<16 | uint32(pData[0])<<24
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o.timeMid = uint16(pData[5]) | uint16(pData[4])<<8
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o.timeHiAndVersion = uint16(pData[7]) | uint16(pData[6])<<8
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o.sequenceHiAndVariant = pData[8]
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o.sequenceLow = pData[9]
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o.node = pData[10:o.Size()]
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}
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func (o *Struct) Bytes() (data []byte) {
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data = []byte{
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byte(o.timeLow >> 24), byte(o.timeLow >> 16), byte(o.timeLow >> 8), byte(o.timeLow),
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byte(o.timeMid >> 8), byte(o.timeMid),
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byte(o.timeHiAndVersion >> 8), byte(o.timeHiAndVersion),
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}
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data = append(data, o.sequenceHiAndVariant)
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data = append(data, o.sequenceLow)
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data = append(data, o.node...)
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return
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}
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// Marshals the UUID bytes into a slice
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func (o *Struct) MarshalBinary() ([]byte, error) {
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return o.Bytes(), nil
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}
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// Un-marshals the data bytes into the UUID struct.
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// Implements the BinaryUn-marshaller interface
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func (o *Struct) UnmarshalBinary(pData []byte) error {
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return UnmarshalBinary(o, pData)
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}
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func (o Struct) String() string {
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return formatter(&o, format)
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}
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func (o Struct) Format(pFormat string) string {
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return formatter(&o, pFormat)
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}
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// Set the three most significant bits (bits 0, 1 and 2) of the
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// sequenceHiAndVariant to variant mask 0x80.
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func (o *Struct) setRFC4122Variant() {
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o.sequenceHiAndVariant &= variantSet
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o.sequenceHiAndVariant |= ReservedRFC4122
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}
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// Unmarshals data into struct for V1 UUIDs
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func newV1(pNow Timestamp, pVersion uint16, pVariant byte, pNode net.HardwareAddr) UUID {
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o := new(Struct)
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o.timeLow = uint32(pNow & 0xFFFFFFFF)
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o.timeMid = uint16((pNow >> 32) & 0xFFFF)
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o.timeHiAndVersion = uint16((pNow >> 48) & 0x0FFF)
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o.timeHiAndVersion |= uint16(pVersion << 12)
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o.sequenceLow = byte(state.sequence & 0xFF)
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o.sequenceHiAndVariant = byte((state.sequence & 0x3F00) >> 8)
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o.sequenceHiAndVariant |= pVariant
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o.node = pNode
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return o
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}
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