golang实现java uuid和string的序列化

EasyNetCN · · 422 次点击 · · 开始浏览

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终于搞定，直接上码

package utiltiy

import (
    "bytes"
    "encoding/binary"

    "github.com/google/uuid"
)

const (
    STREAM_MAGIC    = 0xaced
    STREAM_VERSION  = 5
    TC_STRING       = 0x74
    TC_OBJECT       = 0x73
    TC_CLASSDESC    = 0x72
    SC_SERIALIZABLE = 0x02
    TC_ENDBLOCKDATA = 0x78
    TC_NULL         = 0x70
)

func StringJavaBytes(str string) []byte {
    buf := new(bytes.Buffer)

    buf.Write(ShortBytes(STREAM_MAGIC))
    buf.Write(ShortBytes(STREAM_VERSION))
    buf.Write([]byte{TC_STRING})

    strLen := len(str)

    buf.Write(ShortBytes(uint16(strLen)))
    buf.Write([]byte(str))

    return buf.Bytes()
}

func UUIDJavaBytes(uuid uuid.UUID) []byte {
    byteBuffer := new(bytes.Buffer)

    byteBuffer.Write(ShortBytes(STREAM_MAGIC))
    byteBuffer.Write(ShortBytes(STREAM_VERSION))
    byteBuffer.Write([]byte{TC_OBJECT})
    byteBuffer.Write([]byte{TC_CLASSDESC})

    className := "java.util.UUID"
    classNameLen := len(className)

    byteBuffer.Write(ShortBytes(uint16(classNameLen)))
    byteBuffer.Write([]byte(className))

    sid := -4856846361193249489

    byteBuffer.Write(LongBytes(uint64(sid)))

    //flags
    byteBuffer.Write([]byte{2})

    //fields length
    byteBuffer.Write(ShortBytes(2))

    //filed type code
    byteBuffer.Write([]byte{'J'})

    f1 := "leastSigBits"
    f1Len := len(f1)

    byteBuffer.Write(ShortBytes(uint16(f1Len)))
    byteBuffer.Write([]byte(f1))

    //filed type code
    byteBuffer.Write([]byte{'J'})

    f2 := "mostSigBits"
    f2Len := len(f2)

    byteBuffer.Write(ShortBytes(uint16(f2Len)))
    byteBuffer.Write([]byte(f2))

    byteBuffer.Write([]byte{TC_ENDBLOCKDATA})
    byteBuffer.Write([]byte{TC_NULL})

    mostSigBits, leastSigBits := UUIDSigBits(uuid)

    byteBuffer.Write(LongBytes(uint64(leastSigBits)))

    byteBuffer.Write(LongBytes(uint64(mostSigBits)))

    return byteBuffer.Bytes()

}

func UUIDSigBits(uuid uuid.UUID) (int64, int64) {
    msb := int64(0)
    lsb := int64(0)

    for i, b := range uuid {
        if i >= 0 && i < 8 {
            msb = (msb << 8) | int64(b&0xff)
        } else if i >= 8 && i < 16 {
            lsb = (lsb << 8) | int64(b&0xff)
        }
    }

    return msb, lsb

}

func ShortBytes(i uint16) []byte {
    bytes := make([]byte, 2)

    binary.BigEndian.PutUint16(bytes, i)

    return bytes
}

func LongBytes(i uint64) []byte {
    bytes := make([]byte, 8)

    binary.BigEndian.PutUint64(bytes, i)

    return bytes
}

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