1205 lines
28 KiB
Go
1205 lines
28 KiB
Go
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// Copyright (c) 2012-2018 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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import (
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"math"
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"reflect"
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"time"
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)
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const bincDoPrune = true // No longer needed. Needed before as C lib did not support pruning.
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// vd as low 4 bits (there are 16 slots)
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const (
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bincVdSpecial byte = iota
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bincVdPosInt
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bincVdNegInt
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bincVdFloat
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bincVdString
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bincVdByteArray
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bincVdArray
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bincVdMap
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bincVdTimestamp
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bincVdSmallInt
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bincVdUnicodeOther
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bincVdSymbol
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bincVdDecimal
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_ // open slot
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_ // open slot
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bincVdCustomExt = 0x0f
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)
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const (
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bincSpNil byte = iota
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bincSpFalse
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bincSpTrue
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bincSpNan
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bincSpPosInf
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bincSpNegInf
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bincSpZeroFloat
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bincSpZero
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bincSpNegOne
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)
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const (
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bincFlBin16 byte = iota
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bincFlBin32
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_ // bincFlBin32e
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bincFlBin64
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_ // bincFlBin64e
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// others not currently supported
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)
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func bincdesc(vd, vs byte) string {
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switch vd {
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case bincVdSpecial:
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switch vs {
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case bincSpNil:
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return "nil"
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case bincSpFalse:
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return "false"
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case bincSpTrue:
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return "true"
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case bincSpNan, bincSpPosInf, bincSpNegInf, bincSpZeroFloat:
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return "float"
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case bincSpZero:
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return "uint"
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case bincSpNegOne:
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return "int"
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default:
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return "unknown"
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}
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case bincVdSmallInt, bincVdPosInt:
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return "uint"
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case bincVdNegInt:
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return "int"
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case bincVdFloat:
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return "float"
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case bincVdSymbol:
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return "string"
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case bincVdString:
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return "string"
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case bincVdByteArray:
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return "bytes"
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case bincVdTimestamp:
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return "time"
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case bincVdCustomExt:
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return "ext"
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case bincVdArray:
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return "array"
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case bincVdMap:
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return "map"
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default:
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return "unknown"
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}
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}
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type bincEncDriver struct {
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e *Encoder
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h *BincHandle
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w *encWriterSwitch
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m map[string]uint16 // symbols
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b [16]byte // scratch, used for encoding numbers - bigendian style
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s uint16 // symbols sequencer
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// c containerState
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encDriverTrackContainerWriter
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noBuiltInTypes
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// encNoSeparator
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_ [1]uint64 // padding
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}
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func (e *bincEncDriver) EncodeNil() {
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e.w.writen1(bincVdSpecial<<4 | bincSpNil)
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}
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func (e *bincEncDriver) EncodeTime(t time.Time) {
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if t.IsZero() {
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e.EncodeNil()
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} else {
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bs := bincEncodeTime(t)
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e.w.writen1(bincVdTimestamp<<4 | uint8(len(bs)))
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e.w.writeb(bs)
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}
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}
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func (e *bincEncDriver) EncodeBool(b bool) {
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if b {
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e.w.writen1(bincVdSpecial<<4 | bincSpTrue)
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} else {
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e.w.writen1(bincVdSpecial<<4 | bincSpFalse)
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}
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}
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func (e *bincEncDriver) EncodeFloat32(f float32) {
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if f == 0 {
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e.w.writen1(bincVdSpecial<<4 | bincSpZeroFloat)
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return
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}
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e.w.writen1(bincVdFloat<<4 | bincFlBin32)
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bigenHelper{e.b[:4], e.w}.writeUint32(math.Float32bits(f))
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}
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func (e *bincEncDriver) EncodeFloat64(f float64) {
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if f == 0 {
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e.w.writen1(bincVdSpecial<<4 | bincSpZeroFloat)
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return
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}
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bigen.PutUint64(e.b[:8], math.Float64bits(f))
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if bincDoPrune {
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i := 7
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for ; i >= 0 && (e.b[i] == 0); i-- {
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}
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i++
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if i <= 6 {
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e.w.writen1(bincVdFloat<<4 | 0x8 | bincFlBin64)
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e.w.writen1(byte(i))
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e.w.writeb(e.b[:i])
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return
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}
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}
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e.w.writen1(bincVdFloat<<4 | bincFlBin64)
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e.w.writeb(e.b[:8])
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}
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func (e *bincEncDriver) encIntegerPrune(bd byte, pos bool, v uint64, lim uint8) {
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if lim == 4 {
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bigen.PutUint32(e.b[:lim], uint32(v))
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} else {
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bigen.PutUint64(e.b[:lim], v)
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}
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if bincDoPrune {
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i := pruneSignExt(e.b[:lim], pos)
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e.w.writen1(bd | lim - 1 - byte(i))
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e.w.writeb(e.b[i:lim])
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} else {
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e.w.writen1(bd | lim - 1)
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e.w.writeb(e.b[:lim])
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}
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}
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func (e *bincEncDriver) EncodeInt(v int64) {
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// const nbd byte = bincVdNegInt << 4
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if v >= 0 {
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e.encUint(bincVdPosInt<<4, true, uint64(v))
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} else if v == -1 {
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e.w.writen1(bincVdSpecial<<4 | bincSpNegOne)
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} else {
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e.encUint(bincVdNegInt<<4, false, uint64(-v))
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}
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}
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func (e *bincEncDriver) EncodeUint(v uint64) {
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e.encUint(bincVdPosInt<<4, true, v)
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}
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func (e *bincEncDriver) encUint(bd byte, pos bool, v uint64) {
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if v == 0 {
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e.w.writen1(bincVdSpecial<<4 | bincSpZero)
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} else if pos && v >= 1 && v <= 16 {
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e.w.writen1(bincVdSmallInt<<4 | byte(v-1))
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} else if v <= math.MaxUint8 {
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e.w.writen2(bd|0x0, byte(v))
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} else if v <= math.MaxUint16 {
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e.w.writen1(bd | 0x01)
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bigenHelper{e.b[:2], e.w}.writeUint16(uint16(v))
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} else if v <= math.MaxUint32 {
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e.encIntegerPrune(bd, pos, v, 4)
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} else {
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e.encIntegerPrune(bd, pos, v, 8)
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}
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}
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func (e *bincEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, _ *Encoder) {
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bs := ext.WriteExt(rv)
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if bs == nil {
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e.EncodeNil()
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return
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}
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e.encodeExtPreamble(uint8(xtag), len(bs))
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e.w.writeb(bs)
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}
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func (e *bincEncDriver) EncodeRawExt(re *RawExt, _ *Encoder) {
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e.encodeExtPreamble(uint8(re.Tag), len(re.Data))
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e.w.writeb(re.Data)
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}
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func (e *bincEncDriver) encodeExtPreamble(xtag byte, length int) {
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e.encLen(bincVdCustomExt<<4, uint64(length))
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e.w.writen1(xtag)
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}
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func (e *bincEncDriver) WriteArrayStart(length int) {
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e.encLen(bincVdArray<<4, uint64(length))
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e.c = containerArrayStart
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}
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func (e *bincEncDriver) WriteMapStart(length int) {
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e.encLen(bincVdMap<<4, uint64(length))
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e.c = containerMapStart
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}
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func (e *bincEncDriver) EncodeSymbol(v string) {
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// if WriteSymbolsNoRefs {
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// e.encodeString(cUTF8, v)
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// return
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// }
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//symbols only offer benefit when string length > 1.
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//This is because strings with length 1 take only 2 bytes to store
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//(bd with embedded length, and single byte for string val).
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l := len(v)
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if l == 0 {
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e.encBytesLen(cUTF8, 0)
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return
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} else if l == 1 {
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e.encBytesLen(cUTF8, 1)
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e.w.writen1(v[0])
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return
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}
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if e.m == nil {
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e.m = make(map[string]uint16, 16)
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}
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ui, ok := e.m[v]
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if ok {
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if ui <= math.MaxUint8 {
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e.w.writen2(bincVdSymbol<<4, byte(ui))
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} else {
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e.w.writen1(bincVdSymbol<<4 | 0x8)
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bigenHelper{e.b[:2], e.w}.writeUint16(ui)
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}
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} else {
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e.s++
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ui = e.s
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//ui = uint16(atomic.AddUint32(&e.s, 1))
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e.m[v] = ui
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var lenprec uint8
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if l <= math.MaxUint8 {
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// lenprec = 0
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} else if l <= math.MaxUint16 {
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lenprec = 1
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} else if int64(l) <= math.MaxUint32 {
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lenprec = 2
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} else {
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lenprec = 3
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}
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if ui <= math.MaxUint8 {
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e.w.writen2(bincVdSymbol<<4|0x0|0x4|lenprec, byte(ui))
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} else {
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e.w.writen1(bincVdSymbol<<4 | 0x8 | 0x4 | lenprec)
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bigenHelper{e.b[:2], e.w}.writeUint16(ui)
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}
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if lenprec == 0 {
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e.w.writen1(byte(l))
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} else if lenprec == 1 {
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bigenHelper{e.b[:2], e.w}.writeUint16(uint16(l))
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} else if lenprec == 2 {
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bigenHelper{e.b[:4], e.w}.writeUint32(uint32(l))
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} else {
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bigenHelper{e.b[:8], e.w}.writeUint64(uint64(l))
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}
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e.w.writestr(v)
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}
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}
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func (e *bincEncDriver) EncodeString(c charEncoding, v string) {
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if e.c == containerMapKey && c == cUTF8 && (e.h.AsSymbols == 0 || e.h.AsSymbols == 1) {
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e.EncodeSymbol(v)
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return
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}
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l := uint64(len(v))
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e.encBytesLen(c, l)
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if l > 0 {
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e.w.writestr(v)
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}
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}
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func (e *bincEncDriver) EncodeStringEnc(c charEncoding, v string) {
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if e.c == containerMapKey && c == cUTF8 && (e.h.AsSymbols == 0 || e.h.AsSymbols == 1) {
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e.EncodeSymbol(v)
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return
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}
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l := uint64(len(v))
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e.encLen(bincVdString<<4, l) // e.encBytesLen(c, l)
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if l > 0 {
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e.w.writestr(v)
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}
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}
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func (e *bincEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
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if v == nil {
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e.EncodeNil()
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return
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}
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l := uint64(len(v))
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e.encBytesLen(c, l)
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if l > 0 {
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e.w.writeb(v)
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}
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}
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func (e *bincEncDriver) EncodeStringBytesRaw(v []byte) {
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if v == nil {
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e.EncodeNil()
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return
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}
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l := uint64(len(v))
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e.encLen(bincVdByteArray<<4, l) // e.encBytesLen(c, l)
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if l > 0 {
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e.w.writeb(v)
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}
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}
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func (e *bincEncDriver) encBytesLen(c charEncoding, length uint64) {
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//TODO: support bincUnicodeOther (for now, just use string or bytearray)
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if c == cRAW {
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e.encLen(bincVdByteArray<<4, length)
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} else {
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e.encLen(bincVdString<<4, length)
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}
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}
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func (e *bincEncDriver) encLen(bd byte, l uint64) {
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if l < 12 {
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e.w.writen1(bd | uint8(l+4))
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} else {
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e.encLenNumber(bd, l)
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}
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}
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func (e *bincEncDriver) encLenNumber(bd byte, v uint64) {
|
||
|
|
if v <= math.MaxUint8 {
|
||
|
|
e.w.writen2(bd, byte(v))
|
||
|
|
} else if v <= math.MaxUint16 {
|
||
|
|
e.w.writen1(bd | 0x01)
|
||
|
|
bigenHelper{e.b[:2], e.w}.writeUint16(uint16(v))
|
||
|
|
} else if v <= math.MaxUint32 {
|
||
|
|
e.w.writen1(bd | 0x02)
|
||
|
|
bigenHelper{e.b[:4], e.w}.writeUint32(uint32(v))
|
||
|
|
} else {
|
||
|
|
e.w.writen1(bd | 0x03)
|
||
|
|
bigenHelper{e.b[:8], e.w}.writeUint64(uint64(v))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//------------------------------------
|
||
|
|
|
||
|
|
type bincDecSymbol struct {
|
||
|
|
s string
|
||
|
|
b []byte
|
||
|
|
i uint16
|
||
|
|
}
|
||
|
|
|
||
|
|
type bincDecDriver struct {
|
||
|
|
decDriverNoopContainerReader
|
||
|
|
noBuiltInTypes
|
||
|
|
|
||
|
|
d *Decoder
|
||
|
|
h *BincHandle
|
||
|
|
r *decReaderSwitch
|
||
|
|
br bool // bytes reader
|
||
|
|
bdRead bool
|
||
|
|
bd byte
|
||
|
|
vd byte
|
||
|
|
vs byte
|
||
|
|
_ [3]byte // padding
|
||
|
|
// linear searching on this slice is ok,
|
||
|
|
// because we typically expect < 32 symbols in each stream.
|
||
|
|
s []bincDecSymbol
|
||
|
|
|
||
|
|
// noStreamingCodec
|
||
|
|
// decNoSeparator
|
||
|
|
|
||
|
|
b [(8 + 1) * 8]byte // scratch
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) readNextBd() {
|
||
|
|
d.bd = d.r.readn1()
|
||
|
|
d.vd = d.bd >> 4
|
||
|
|
d.vs = d.bd & 0x0f
|
||
|
|
d.bdRead = true
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) uncacheRead() {
|
||
|
|
if d.bdRead {
|
||
|
|
d.r.unreadn1()
|
||
|
|
d.bdRead = false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) ContainerType() (vt valueType) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.vd == bincVdSpecial && d.vs == bincSpNil {
|
||
|
|
return valueTypeNil
|
||
|
|
} else if d.vd == bincVdByteArray {
|
||
|
|
return valueTypeBytes
|
||
|
|
} else if d.vd == bincVdString {
|
||
|
|
return valueTypeString
|
||
|
|
} else if d.vd == bincVdArray {
|
||
|
|
return valueTypeArray
|
||
|
|
} else if d.vd == bincVdMap {
|
||
|
|
return valueTypeMap
|
||
|
|
}
|
||
|
|
// else {
|
||
|
|
// d.d.errorf("isContainerType: unsupported parameter: %v", vt)
|
||
|
|
// }
|
||
|
|
return valueTypeUnset
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) TryDecodeAsNil() bool {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.bd == bincVdSpecial<<4|bincSpNil {
|
||
|
|
d.bdRead = false
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeTime() (t time.Time) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.bd == bincVdSpecial<<4|bincSpNil {
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if d.vd != bincVdTimestamp {
|
||
|
|
d.d.errorf("cannot decode time - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
t, err := bincDecodeTime(d.r.readx(uint(d.vs)))
|
||
|
|
if err != nil {
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decFloatPre(vs, defaultLen byte) {
|
||
|
|
if vs&0x8 == 0 {
|
||
|
|
d.r.readb(d.b[0:defaultLen])
|
||
|
|
} else {
|
||
|
|
l := d.r.readn1()
|
||
|
|
if l > 8 {
|
||
|
|
d.d.errorf("cannot read float - at most 8 bytes used to represent float - received %v bytes", l)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
for i := l; i < 8; i++ {
|
||
|
|
d.b[i] = 0
|
||
|
|
}
|
||
|
|
d.r.readb(d.b[0:l])
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decFloat() (f float64) {
|
||
|
|
//if true { f = math.Float64frombits(bigen.Uint64(d.r.readx(8))); break; }
|
||
|
|
if x := d.vs & 0x7; x == bincFlBin32 {
|
||
|
|
d.decFloatPre(d.vs, 4)
|
||
|
|
f = float64(math.Float32frombits(bigen.Uint32(d.b[0:4])))
|
||
|
|
} else if x == bincFlBin64 {
|
||
|
|
d.decFloatPre(d.vs, 8)
|
||
|
|
f = math.Float64frombits(bigen.Uint64(d.b[0:8]))
|
||
|
|
} else {
|
||
|
|
d.d.errorf("read float - only float32 and float64 are supported - %s %x-%x/%s",
|
||
|
|
msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decUint() (v uint64) {
|
||
|
|
// need to inline the code (interface conversion and type assertion expensive)
|
||
|
|
switch d.vs {
|
||
|
|
case 0:
|
||
|
|
v = uint64(d.r.readn1())
|
||
|
|
case 1:
|
||
|
|
d.r.readb(d.b[6:8])
|
||
|
|
v = uint64(bigen.Uint16(d.b[6:8]))
|
||
|
|
case 2:
|
||
|
|
d.b[4] = 0
|
||
|
|
d.r.readb(d.b[5:8])
|
||
|
|
v = uint64(bigen.Uint32(d.b[4:8]))
|
||
|
|
case 3:
|
||
|
|
d.r.readb(d.b[4:8])
|
||
|
|
v = uint64(bigen.Uint32(d.b[4:8]))
|
||
|
|
case 4, 5, 6:
|
||
|
|
lim := 7 - d.vs
|
||
|
|
d.r.readb(d.b[lim:8])
|
||
|
|
for i := uint8(0); i < lim; i++ {
|
||
|
|
d.b[i] = 0
|
||
|
|
}
|
||
|
|
v = uint64(bigen.Uint64(d.b[:8]))
|
||
|
|
case 7:
|
||
|
|
d.r.readb(d.b[:8])
|
||
|
|
v = uint64(bigen.Uint64(d.b[:8]))
|
||
|
|
default:
|
||
|
|
d.d.errorf("unsigned integers with greater than 64 bits of precision not supported")
|
||
|
|
return
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decCheckInteger() (ui uint64, neg bool) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
vd, vs := d.vd, d.vs
|
||
|
|
if vd == bincVdPosInt {
|
||
|
|
ui = d.decUint()
|
||
|
|
} else if vd == bincVdNegInt {
|
||
|
|
ui = d.decUint()
|
||
|
|
neg = true
|
||
|
|
} else if vd == bincVdSmallInt {
|
||
|
|
ui = uint64(d.vs) + 1
|
||
|
|
} else if vd == bincVdSpecial {
|
||
|
|
if vs == bincSpZero {
|
||
|
|
//i = 0
|
||
|
|
} else if vs == bincSpNegOne {
|
||
|
|
neg = true
|
||
|
|
ui = 1
|
||
|
|
} else {
|
||
|
|
d.d.errorf("integer decode fails - invalid special value from descriptor %x-%x/%s",
|
||
|
|
d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
d.d.errorf("integer can only be decoded from int/uint. d.bd: 0x%x, d.vd: 0x%x", d.bd, d.vd)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeInt64() (i int64) {
|
||
|
|
ui, neg := d.decCheckInteger()
|
||
|
|
i = chkOvf.SignedIntV(ui)
|
||
|
|
if neg {
|
||
|
|
i = -i
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeUint64() (ui uint64) {
|
||
|
|
ui, neg := d.decCheckInteger()
|
||
|
|
if neg {
|
||
|
|
d.d.errorf("assigning negative signed value to unsigned integer type")
|
||
|
|
return
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeFloat64() (f float64) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
vd, vs := d.vd, d.vs
|
||
|
|
if vd == bincVdSpecial {
|
||
|
|
d.bdRead = false
|
||
|
|
if vs == bincSpNan {
|
||
|
|
return math.NaN()
|
||
|
|
} else if vs == bincSpPosInf {
|
||
|
|
return math.Inf(1)
|
||
|
|
} else if vs == bincSpZeroFloat || vs == bincSpZero {
|
||
|
|
return
|
||
|
|
} else if vs == bincSpNegInf {
|
||
|
|
return math.Inf(-1)
|
||
|
|
} else {
|
||
|
|
d.d.errorf("float - invalid special value from descriptor %x-%x/%s",
|
||
|
|
d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
} else if vd == bincVdFloat {
|
||
|
|
f = d.decFloat()
|
||
|
|
} else {
|
||
|
|
f = float64(d.DecodeInt64())
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// bool can be decoded from bool only (single byte).
|
||
|
|
func (d *bincDecDriver) DecodeBool() (b bool) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if bd := d.bd; bd == (bincVdSpecial | bincSpFalse) {
|
||
|
|
// b = false
|
||
|
|
} else if bd == (bincVdSpecial | bincSpTrue) {
|
||
|
|
b = true
|
||
|
|
} else {
|
||
|
|
d.d.errorf("bool - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) ReadMapStart() (length int) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.vd != bincVdMap {
|
||
|
|
d.d.errorf("map - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
length = d.decLen()
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) ReadArrayStart() (length int) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.vd != bincVdArray {
|
||
|
|
d.d.errorf("array - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
length = d.decLen()
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decLen() int {
|
||
|
|
if d.vs > 3 {
|
||
|
|
return int(d.vs - 4)
|
||
|
|
}
|
||
|
|
return int(d.decLenNumber())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decLenNumber() (v uint64) {
|
||
|
|
if x := d.vs; x == 0 {
|
||
|
|
v = uint64(d.r.readn1())
|
||
|
|
} else if x == 1 {
|
||
|
|
d.r.readb(d.b[6:8])
|
||
|
|
v = uint64(bigen.Uint16(d.b[6:8]))
|
||
|
|
} else if x == 2 {
|
||
|
|
d.r.readb(d.b[4:8])
|
||
|
|
v = uint64(bigen.Uint32(d.b[4:8]))
|
||
|
|
} else {
|
||
|
|
d.r.readb(d.b[:8])
|
||
|
|
v = bigen.Uint64(d.b[:8])
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decStringAndBytes(bs []byte, withString, zerocopy bool) (
|
||
|
|
bs2 []byte, s string) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.bd == bincVdSpecial<<4|bincSpNil {
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
var slen = -1
|
||
|
|
// var ok bool
|
||
|
|
switch d.vd {
|
||
|
|
case bincVdString, bincVdByteArray:
|
||
|
|
slen = d.decLen()
|
||
|
|
if zerocopy {
|
||
|
|
if d.br {
|
||
|
|
bs2 = d.r.readx(uint(slen))
|
||
|
|
} else if len(bs) == 0 {
|
||
|
|
bs2 = decByteSlice(d.r, slen, d.d.h.MaxInitLen, d.b[:])
|
||
|
|
} else {
|
||
|
|
bs2 = decByteSlice(d.r, slen, d.d.h.MaxInitLen, bs)
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
bs2 = decByteSlice(d.r, slen, d.d.h.MaxInitLen, bs)
|
||
|
|
}
|
||
|
|
if withString {
|
||
|
|
s = string(bs2)
|
||
|
|
}
|
||
|
|
case bincVdSymbol:
|
||
|
|
// zerocopy doesn't apply for symbols,
|
||
|
|
// as the values must be stored in a table for later use.
|
||
|
|
//
|
||
|
|
//from vs: extract numSymbolBytes, containsStringVal, strLenPrecision,
|
||
|
|
//extract symbol
|
||
|
|
//if containsStringVal, read it and put in map
|
||
|
|
//else look in map for string value
|
||
|
|
var symbol uint16
|
||
|
|
vs := d.vs
|
||
|
|
if vs&0x8 == 0 {
|
||
|
|
symbol = uint16(d.r.readn1())
|
||
|
|
} else {
|
||
|
|
symbol = uint16(bigen.Uint16(d.r.readx(2)))
|
||
|
|
}
|
||
|
|
if d.s == nil {
|
||
|
|
d.s = make([]bincDecSymbol, 0, 16)
|
||
|
|
}
|
||
|
|
|
||
|
|
if vs&0x4 == 0 {
|
||
|
|
for i := range d.s {
|
||
|
|
j := &d.s[i]
|
||
|
|
if j.i == symbol {
|
||
|
|
bs2 = j.b
|
||
|
|
if withString {
|
||
|
|
if j.s == "" && bs2 != nil {
|
||
|
|
j.s = string(bs2)
|
||
|
|
}
|
||
|
|
s = j.s
|
||
|
|
}
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
switch vs & 0x3 {
|
||
|
|
case 0:
|
||
|
|
slen = int(d.r.readn1())
|
||
|
|
case 1:
|
||
|
|
slen = int(bigen.Uint16(d.r.readx(2)))
|
||
|
|
case 2:
|
||
|
|
slen = int(bigen.Uint32(d.r.readx(4)))
|
||
|
|
case 3:
|
||
|
|
slen = int(bigen.Uint64(d.r.readx(8)))
|
||
|
|
}
|
||
|
|
// since using symbols, do not store any part of
|
||
|
|
// the parameter bs in the map, as it might be a shared buffer.
|
||
|
|
// bs2 = decByteSlice(d.r, slen, bs)
|
||
|
|
bs2 = decByteSlice(d.r, slen, d.d.h.MaxInitLen, nil)
|
||
|
|
if withString {
|
||
|
|
s = string(bs2)
|
||
|
|
}
|
||
|
|
d.s = append(d.s, bincDecSymbol{i: symbol, s: s, b: bs2})
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
d.d.errorf("string/bytes - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeString() (s string) {
|
||
|
|
// DecodeBytes does not accommodate symbols, whose impl stores string version in map.
|
||
|
|
// Use decStringAndBytes directly.
|
||
|
|
// return string(d.DecodeBytes(d.b[:], true, true))
|
||
|
|
_, s = d.decStringAndBytes(d.b[:], true, true)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeStringAsBytes() (s []byte) {
|
||
|
|
s, _ = d.decStringAndBytes(d.b[:], false, true)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeBytes(bs []byte, zerocopy bool) (bsOut []byte) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.bd == bincVdSpecial<<4|bincSpNil {
|
||
|
|
d.bdRead = false
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
// check if an "array" of uint8's (see ContainerType for how to infer if an array)
|
||
|
|
if d.vd == bincVdArray {
|
||
|
|
bsOut, _ = fastpathTV.DecSliceUint8V(bs, true, d.d)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
var clen int
|
||
|
|
if d.vd == bincVdString || d.vd == bincVdByteArray {
|
||
|
|
clen = d.decLen()
|
||
|
|
} else {
|
||
|
|
d.d.errorf("bytes - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
if zerocopy {
|
||
|
|
if d.br {
|
||
|
|
return d.r.readx(uint(clen))
|
||
|
|
} else if len(bs) == 0 {
|
||
|
|
bs = d.b[:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return decByteSlice(d.r, clen, d.d.h.MaxInitLen, bs)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
|
||
|
|
if xtag > 0xff {
|
||
|
|
d.d.errorf("ext: tag must be <= 0xff; got: %v", xtag)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
realxtag1, xbs := d.decodeExtV(ext != nil, uint8(xtag))
|
||
|
|
realxtag = uint64(realxtag1)
|
||
|
|
if ext == nil {
|
||
|
|
re := rv.(*RawExt)
|
||
|
|
re.Tag = realxtag
|
||
|
|
re.Data = detachZeroCopyBytes(d.br, re.Data, xbs)
|
||
|
|
} else {
|
||
|
|
ext.ReadExt(rv, xbs)
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) decodeExtV(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
if d.vd == bincVdCustomExt {
|
||
|
|
l := d.decLen()
|
||
|
|
xtag = d.r.readn1()
|
||
|
|
if verifyTag && xtag != tag {
|
||
|
|
d.d.errorf("wrong extension tag - got %b, expecting: %v", xtag, tag)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if d.br {
|
||
|
|
xbs = d.r.readx(uint(l))
|
||
|
|
} else {
|
||
|
|
xbs = decByteSlice(d.r, l, d.d.h.MaxInitLen, d.d.b[:])
|
||
|
|
}
|
||
|
|
} else if d.vd == bincVdByteArray {
|
||
|
|
xbs = d.DecodeBytes(nil, true)
|
||
|
|
} else {
|
||
|
|
d.d.errorf("ext - expecting extensions or byte array - %s %x-%x/%s",
|
||
|
|
msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
return
|
||
|
|
}
|
||
|
|
d.bdRead = false
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) DecodeNaked() {
|
||
|
|
if !d.bdRead {
|
||
|
|
d.readNextBd()
|
||
|
|
}
|
||
|
|
|
||
|
|
n := d.d.naked()
|
||
|
|
var decodeFurther bool
|
||
|
|
|
||
|
|
switch d.vd {
|
||
|
|
case bincVdSpecial:
|
||
|
|
switch d.vs {
|
||
|
|
case bincSpNil:
|
||
|
|
n.v = valueTypeNil
|
||
|
|
case bincSpFalse:
|
||
|
|
n.v = valueTypeBool
|
||
|
|
n.b = false
|
||
|
|
case bincSpTrue:
|
||
|
|
n.v = valueTypeBool
|
||
|
|
n.b = true
|
||
|
|
case bincSpNan:
|
||
|
|
n.v = valueTypeFloat
|
||
|
|
n.f = math.NaN()
|
||
|
|
case bincSpPosInf:
|
||
|
|
n.v = valueTypeFloat
|
||
|
|
n.f = math.Inf(1)
|
||
|
|
case bincSpNegInf:
|
||
|
|
n.v = valueTypeFloat
|
||
|
|
n.f = math.Inf(-1)
|
||
|
|
case bincSpZeroFloat:
|
||
|
|
n.v = valueTypeFloat
|
||
|
|
n.f = float64(0)
|
||
|
|
case bincSpZero:
|
||
|
|
n.v = valueTypeUint
|
||
|
|
n.u = uint64(0) // int8(0)
|
||
|
|
case bincSpNegOne:
|
||
|
|
n.v = valueTypeInt
|
||
|
|
n.i = int64(-1) // int8(-1)
|
||
|
|
default:
|
||
|
|
d.d.errorf("cannot infer value - unrecognized special value from descriptor %x-%x/%s",
|
||
|
|
d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
}
|
||
|
|
case bincVdSmallInt:
|
||
|
|
n.v = valueTypeUint
|
||
|
|
n.u = uint64(int8(d.vs)) + 1 // int8(d.vs) + 1
|
||
|
|
case bincVdPosInt:
|
||
|
|
n.v = valueTypeUint
|
||
|
|
n.u = d.decUint()
|
||
|
|
case bincVdNegInt:
|
||
|
|
n.v = valueTypeInt
|
||
|
|
n.i = -(int64(d.decUint()))
|
||
|
|
case bincVdFloat:
|
||
|
|
n.v = valueTypeFloat
|
||
|
|
n.f = d.decFloat()
|
||
|
|
case bincVdSymbol:
|
||
|
|
n.v = valueTypeSymbol
|
||
|
|
n.s = d.DecodeString()
|
||
|
|
case bincVdString:
|
||
|
|
n.v = valueTypeString
|
||
|
|
n.s = d.DecodeString()
|
||
|
|
case bincVdByteArray:
|
||
|
|
n.v = valueTypeBytes
|
||
|
|
n.l = d.DecodeBytes(nil, false)
|
||
|
|
case bincVdTimestamp:
|
||
|
|
n.v = valueTypeTime
|
||
|
|
tt, err := bincDecodeTime(d.r.readx(uint(d.vs)))
|
||
|
|
if err != nil {
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
n.t = tt
|
||
|
|
case bincVdCustomExt:
|
||
|
|
n.v = valueTypeExt
|
||
|
|
l := d.decLen()
|
||
|
|
n.u = uint64(d.r.readn1())
|
||
|
|
if d.br {
|
||
|
|
n.l = d.r.readx(uint(l))
|
||
|
|
} else {
|
||
|
|
n.l = decByteSlice(d.r, l, d.d.h.MaxInitLen, d.d.b[:])
|
||
|
|
}
|
||
|
|
case bincVdArray:
|
||
|
|
n.v = valueTypeArray
|
||
|
|
decodeFurther = true
|
||
|
|
case bincVdMap:
|
||
|
|
n.v = valueTypeMap
|
||
|
|
decodeFurther = true
|
||
|
|
default:
|
||
|
|
d.d.errorf("cannot infer value - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
||
|
|
}
|
||
|
|
|
||
|
|
if !decodeFurther {
|
||
|
|
d.bdRead = false
|
||
|
|
}
|
||
|
|
if n.v == valueTypeUint && d.h.SignedInteger {
|
||
|
|
n.v = valueTypeInt
|
||
|
|
n.i = int64(n.u)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//------------------------------------
|
||
|
|
|
||
|
|
//BincHandle is a Handle for the Binc Schema-Free Encoding Format
|
||
|
|
//defined at https://github.com/ugorji/binc .
|
||
|
|
//
|
||
|
|
//BincHandle currently supports all Binc features with the following EXCEPTIONS:
|
||
|
|
// - only integers up to 64 bits of precision are supported.
|
||
|
|
// big integers are unsupported.
|
||
|
|
// - Only IEEE 754 binary32 and binary64 floats are supported (ie Go float32 and float64 types).
|
||
|
|
// extended precision and decimal IEEE 754 floats are unsupported.
|
||
|
|
// - Only UTF-8 strings supported.
|
||
|
|
// Unicode_Other Binc types (UTF16, UTF32) are currently unsupported.
|
||
|
|
//
|
||
|
|
//Note that these EXCEPTIONS are temporary and full support is possible and may happen soon.
|
||
|
|
type BincHandle struct {
|
||
|
|
BasicHandle
|
||
|
|
binaryEncodingType
|
||
|
|
noElemSeparators
|
||
|
|
|
||
|
|
// AsSymbols defines what should be encoded as symbols.
|
||
|
|
//
|
||
|
|
// Encoding as symbols can reduce the encoded size significantly.
|
||
|
|
//
|
||
|
|
// However, during decoding, each string to be encoded as a symbol must
|
||
|
|
// be checked to see if it has been seen before. Consequently, encoding time
|
||
|
|
// will increase if using symbols, because string comparisons has a clear cost.
|
||
|
|
//
|
||
|
|
// Values:
|
||
|
|
// - 0: default: library uses best judgement
|
||
|
|
// - 1: use symbols
|
||
|
|
// - 2: do not use symbols
|
||
|
|
AsSymbols uint8
|
||
|
|
|
||
|
|
// AsSymbols: may later on introduce more options ...
|
||
|
|
// - m: map keys
|
||
|
|
// - s: struct fields
|
||
|
|
// - n: none
|
||
|
|
// - a: all: same as m, s, ...
|
||
|
|
|
||
|
|
// _ [1]uint64 // padding
|
||
|
|
}
|
||
|
|
|
||
|
|
// Name returns the name of the handle: binc
|
||
|
|
func (h *BincHandle) Name() string { return "binc" }
|
||
|
|
|
||
|
|
// SetBytesExt sets an extension
|
||
|
|
func (h *BincHandle) SetBytesExt(rt reflect.Type, tag uint64, ext BytesExt) (err error) {
|
||
|
|
return h.SetExt(rt, tag, &extWrapper{ext, interfaceExtFailer{}})
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *BincHandle) newEncDriver(e *Encoder) encDriver {
|
||
|
|
return &bincEncDriver{e: e, h: h, w: e.w}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *BincHandle) newDecDriver(d *Decoder) decDriver {
|
||
|
|
return &bincDecDriver{d: d, h: h, r: d.r, br: d.bytes}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *bincEncDriver) reset() {
|
||
|
|
e.w = e.e.w
|
||
|
|
e.s = 0
|
||
|
|
e.c = 0
|
||
|
|
e.m = nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *bincDecDriver) reset() {
|
||
|
|
d.r, d.br = d.d.r, d.d.bytes
|
||
|
|
d.s = nil
|
||
|
|
d.bd, d.bdRead, d.vd, d.vs = 0, false, 0, 0
|
||
|
|
}
|
||
|
|
|
||
|
|
// var timeDigits = [...]byte{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
|
||
|
|
|
||
|
|
// EncodeTime encodes a time.Time as a []byte, including
|
||
|
|
// information on the instant in time and UTC offset.
|
||
|
|
//
|
||
|
|
// Format Description
|
||
|
|
//
|
||
|
|
// A timestamp is composed of 3 components:
|
||
|
|
//
|
||
|
|
// - secs: signed integer representing seconds since unix epoch
|
||
|
|
// - nsces: unsigned integer representing fractional seconds as a
|
||
|
|
// nanosecond offset within secs, in the range 0 <= nsecs < 1e9
|
||
|
|
// - tz: signed integer representing timezone offset in minutes east of UTC,
|
||
|
|
// and a dst (daylight savings time) flag
|
||
|
|
//
|
||
|
|
// When encoding a timestamp, the first byte is the descriptor, which
|
||
|
|
// defines which components are encoded and how many bytes are used to
|
||
|
|
// encode secs and nsecs components. *If secs/nsecs is 0 or tz is UTC, it
|
||
|
|
// is not encoded in the byte array explicitly*.
|
||
|
|
//
|
||
|
|
// Descriptor 8 bits are of the form `A B C DDD EE`:
|
||
|
|
// A: Is secs component encoded? 1 = true
|
||
|
|
// B: Is nsecs component encoded? 1 = true
|
||
|
|
// C: Is tz component encoded? 1 = true
|
||
|
|
// DDD: Number of extra bytes for secs (range 0-7).
|
||
|
|
// If A = 1, secs encoded in DDD+1 bytes.
|
||
|
|
// If A = 0, secs is not encoded, and is assumed to be 0.
|
||
|
|
// If A = 1, then we need at least 1 byte to encode secs.
|
||
|
|
// DDD says the number of extra bytes beyond that 1.
|
||
|
|
// E.g. if DDD=0, then secs is represented in 1 byte.
|
||
|
|
// if DDD=2, then secs is represented in 3 bytes.
|
||
|
|
// EE: Number of extra bytes for nsecs (range 0-3).
|
||
|
|
// If B = 1, nsecs encoded in EE+1 bytes (similar to secs/DDD above)
|
||
|
|
//
|
||
|
|
// Following the descriptor bytes, subsequent bytes are:
|
||
|
|
//
|
||
|
|
// secs component encoded in `DDD + 1` bytes (if A == 1)
|
||
|
|
// nsecs component encoded in `EE + 1` bytes (if B == 1)
|
||
|
|
// tz component encoded in 2 bytes (if C == 1)
|
||
|
|
//
|
||
|
|
// secs and nsecs components are integers encoded in a BigEndian
|
||
|
|
// 2-complement encoding format.
|
||
|
|
//
|
||
|
|
// tz component is encoded as 2 bytes (16 bits). Most significant bit 15 to
|
||
|
|
// Least significant bit 0 are described below:
|
||
|
|
//
|
||
|
|
// Timezone offset has a range of -12:00 to +14:00 (ie -720 to +840 minutes).
|
||
|
|
// Bit 15 = have\_dst: set to 1 if we set the dst flag.
|
||
|
|
// Bit 14 = dst\_on: set to 1 if dst is in effect at the time, or 0 if not.
|
||
|
|
// Bits 13..0 = timezone offset in minutes. It is a signed integer in Big Endian format.
|
||
|
|
//
|
||
|
|
func bincEncodeTime(t time.Time) []byte {
|
||
|
|
//t := rv.Interface().(time.Time)
|
||
|
|
tsecs, tnsecs := t.Unix(), t.Nanosecond()
|
||
|
|
var (
|
||
|
|
bd byte
|
||
|
|
btmp [8]byte
|
||
|
|
bs [16]byte
|
||
|
|
i int = 1
|
||
|
|
)
|
||
|
|
l := t.Location()
|
||
|
|
if l == time.UTC {
|
||
|
|
l = nil
|
||
|
|
}
|
||
|
|
if tsecs != 0 {
|
||
|
|
bd = bd | 0x80
|
||
|
|
bigen.PutUint64(btmp[:], uint64(tsecs))
|
||
|
|
f := pruneSignExt(btmp[:], tsecs >= 0)
|
||
|
|
bd = bd | (byte(7-f) << 2)
|
||
|
|
copy(bs[i:], btmp[f:])
|
||
|
|
i = i + (8 - f)
|
||
|
|
}
|
||
|
|
if tnsecs != 0 {
|
||
|
|
bd = bd | 0x40
|
||
|
|
bigen.PutUint32(btmp[:4], uint32(tnsecs))
|
||
|
|
f := pruneSignExt(btmp[:4], true)
|
||
|
|
bd = bd | byte(3-f)
|
||
|
|
copy(bs[i:], btmp[f:4])
|
||
|
|
i = i + (4 - f)
|
||
|
|
}
|
||
|
|
if l != nil {
|
||
|
|
bd = bd | 0x20
|
||
|
|
// Note that Go Libs do not give access to dst flag.
|
||
|
|
_, zoneOffset := t.Zone()
|
||
|
|
//zoneName, zoneOffset := t.Zone()
|
||
|
|
zoneOffset /= 60
|
||
|
|
z := uint16(zoneOffset)
|
||
|
|
bigen.PutUint16(btmp[:2], z)
|
||
|
|
// clear dst flags
|
||
|
|
bs[i] = btmp[0] & 0x3f
|
||
|
|
bs[i+1] = btmp[1]
|
||
|
|
i = i + 2
|
||
|
|
}
|
||
|
|
bs[0] = bd
|
||
|
|
return bs[0:i]
|
||
|
|
}
|
||
|
|
|
||
|
|
// bincDecodeTime decodes a []byte into a time.Time.
|
||
|
|
func bincDecodeTime(bs []byte) (tt time.Time, err error) {
|
||
|
|
bd := bs[0]
|
||
|
|
var (
|
||
|
|
tsec int64
|
||
|
|
tnsec uint32
|
||
|
|
tz uint16
|
||
|
|
i byte = 1
|
||
|
|
i2 byte
|
||
|
|
n byte
|
||
|
|
)
|
||
|
|
if bd&(1<<7) != 0 {
|
||
|
|
var btmp [8]byte
|
||
|
|
n = ((bd >> 2) & 0x7) + 1
|
||
|
|
i2 = i + n
|
||
|
|
copy(btmp[8-n:], bs[i:i2])
|
||
|
|
//if first bit of bs[i] is set, then fill btmp[0..8-n] with 0xff (ie sign extend it)
|
||
|
|
if bs[i]&(1<<7) != 0 {
|
||
|
|
copy(btmp[0:8-n], bsAll0xff)
|
||
|
|
//for j,k := byte(0), 8-n; j < k; j++ { btmp[j] = 0xff }
|
||
|
|
}
|
||
|
|
i = i2
|
||
|
|
tsec = int64(bigen.Uint64(btmp[:]))
|
||
|
|
}
|
||
|
|
if bd&(1<<6) != 0 {
|
||
|
|
var btmp [4]byte
|
||
|
|
n = (bd & 0x3) + 1
|
||
|
|
i2 = i + n
|
||
|
|
copy(btmp[4-n:], bs[i:i2])
|
||
|
|
i = i2
|
||
|
|
tnsec = bigen.Uint32(btmp[:])
|
||
|
|
}
|
||
|
|
if bd&(1<<5) == 0 {
|
||
|
|
tt = time.Unix(tsec, int64(tnsec)).UTC()
|
||
|
|
return
|
||
|
|
}
|
||
|
|
// In stdlib time.Parse, when a date is parsed without a zone name, it uses "" as zone name.
|
||
|
|
// However, we need name here, so it can be shown when time is printed.
|
||
|
|
// Zone name is in form: UTC-08:00.
|
||
|
|
// Note that Go Libs do not give access to dst flag, so we ignore dst bits
|
||
|
|
|
||
|
|
i2 = i + 2
|
||
|
|
tz = bigen.Uint16(bs[i:i2])
|
||
|
|
// i = i2
|
||
|
|
// sign extend sign bit into top 2 MSB (which were dst bits):
|
||
|
|
if tz&(1<<13) == 0 { // positive
|
||
|
|
tz = tz & 0x3fff //clear 2 MSBs: dst bits
|
||
|
|
} else { // negative
|
||
|
|
tz = tz | 0xc000 //set 2 MSBs: dst bits
|
||
|
|
}
|
||
|
|
tzint := int16(tz)
|
||
|
|
if tzint == 0 {
|
||
|
|
tt = time.Unix(tsec, int64(tnsec)).UTC()
|
||
|
|
} else {
|
||
|
|
// For Go Time, do not use a descriptive timezone.
|
||
|
|
// It's unnecessary, and makes it harder to do a reflect.DeepEqual.
|
||
|
|
// The Offset already tells what the offset should be, if not on UTC and unknown zone name.
|
||
|
|
// var zoneName = timeLocUTCName(tzint)
|
||
|
|
tt = time.Unix(tsec, int64(tnsec)).In(time.FixedZone("", int(tzint)*60))
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
var _ decDriver = (*bincDecDriver)(nil)
|
||
|
|
var _ encDriver = (*bincEncDriver)(nil)
|