mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-31 16:12:24 -05:00
1319 lines
32 KiB
Go
1319 lines
32 KiB
Go
// Copyright (c) 2012-2020 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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"unicode/utf8"
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)
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// Symbol management:
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// - symbols are stored in a symbol map during encoding and decoding.
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// - the symbols persist until the (En|De)coder ResetXXX method is called.
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const bincDoPrune = true
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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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_ byte = iota // bincFlBin16
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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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const bincBdNil = 0 // bincVdSpecial<<4 | bincSpNil // staticcheck barfs on this (SA4016)
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var (
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bincdescSpecialVsNames = map[byte]string{
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bincSpNil: "nil",
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bincSpFalse: "false",
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bincSpTrue: "true",
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bincSpNan: "float",
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bincSpPosInf: "float",
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bincSpNegInf: "float",
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bincSpZeroFloat: "float",
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bincSpZero: "uint",
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bincSpNegOne: "int",
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}
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bincdescVdNames = map[byte]string{
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bincVdSpecial: "special",
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bincVdSmallInt: "uint",
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bincVdPosInt: "uint",
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bincVdFloat: "float",
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bincVdSymbol: "string",
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bincVdString: "string",
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bincVdByteArray: "bytes",
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bincVdTimestamp: "time",
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bincVdCustomExt: "ext",
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bincVdArray: "array",
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bincVdMap: "map",
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}
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)
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func bincdescbd(bd byte) (s string) {
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return bincdesc(bd>>4, bd&0x0f)
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}
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func bincdesc(vd, vs byte) (s string) {
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if vd == bincVdSpecial {
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s = bincdescSpecialVsNames[vs]
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} else {
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s = bincdescVdNames[vd]
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}
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if s == "" {
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s = "unknown"
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}
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return
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}
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type bincEncState struct {
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m map[string]uint16 // symbols
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}
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func (e bincEncState) captureState() interface{} { return e.m }
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func (e *bincEncState) resetState() { e.m = nil }
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func (e *bincEncState) reset() { e.resetState() }
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func (e *bincEncState) restoreState(v interface{}) { e.m = v.(map[string]uint16) }
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type bincEncDriver struct {
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noBuiltInTypes
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encDriverNoopContainerWriter
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h *BincHandle
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bincEncState
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e Encoder
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}
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func (e *bincEncDriver) encoder() *Encoder {
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return &e.e
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}
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func (e *bincEncDriver) EncodeNil() {
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e.e.encWr.writen1(bincBdNil)
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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.e.encWr.writen1(bincVdTimestamp<<4 | uint8(len(bs)))
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e.e.encWr.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.e.encWr.writen1(bincVdSpecial<<4 | bincSpTrue)
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} else {
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e.e.encWr.writen1(bincVdSpecial<<4 | bincSpFalse)
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}
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}
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func (e *bincEncDriver) encSpFloat(f float64) (done bool) {
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if f == 0 {
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e.e.encWr.writen1(bincVdSpecial<<4 | bincSpZeroFloat)
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} else if math.IsNaN(float64(f)) {
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e.e.encWr.writen1(bincVdSpecial<<4 | bincSpNan)
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} else if math.IsInf(float64(f), +1) {
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e.e.encWr.writen1(bincVdSpecial<<4 | bincSpPosInf)
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} else if math.IsInf(float64(f), -1) {
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e.e.encWr.writen1(bincVdSpecial<<4 | bincSpNegInf)
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} else {
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return
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}
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return true
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}
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func (e *bincEncDriver) EncodeFloat32(f float32) {
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if !e.encSpFloat(float64(f)) {
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e.e.encWr.writen1(bincVdFloat<<4 | bincFlBin32)
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bigen.writeUint32(e.e.w(), math.Float32bits(f))
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}
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}
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func (e *bincEncDriver) EncodeFloat64(f float64) {
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if e.encSpFloat(f) {
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return
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}
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b := bigen.PutUint64(math.Float64bits(f))
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if bincDoPrune {
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i := 7
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for ; i >= 0 && (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.e.encWr.writen1(bincVdFloat<<4 | 0x8 | bincFlBin64)
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e.e.encWr.writen1(byte(i))
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e.e.encWr.writeb(b[:i])
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return
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}
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}
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e.e.encWr.writen1(bincVdFloat<<4 | bincFlBin64)
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e.e.encWr.writen8(b)
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}
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func (e *bincEncDriver) encIntegerPrune32(bd byte, pos bool, v uint64) {
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b := bigen.PutUint32(uint32(v))
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if bincDoPrune {
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i := byte(pruneSignExt(b[:], pos))
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e.e.encWr.writen1(bd | 3 - i)
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e.e.encWr.writeb(b[i:])
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} else {
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e.e.encWr.writen1(bd | 3)
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e.e.encWr.writen4(b)
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}
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}
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func (e *bincEncDriver) encIntegerPrune64(bd byte, pos bool, v uint64) {
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b := bigen.PutUint64(v)
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if bincDoPrune {
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i := byte(pruneSignExt(b[:], pos))
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e.e.encWr.writen1(bd | 7 - i)
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e.e.encWr.writeb(b[i:])
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} else {
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e.e.encWr.writen1(bd | 7)
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e.e.encWr.writen8(b)
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}
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}
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func (e *bincEncDriver) EncodeInt(v int64) {
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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.e.encWr.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.e.encWr.writen1(bincVdSpecial<<4 | bincSpZero)
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} else if pos && v >= 1 && v <= 16 {
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e.e.encWr.writen1(bincVdSmallInt<<4 | byte(v-1))
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} else if v <= math.MaxUint8 {
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e.e.encWr.writen2(bd|0x0, byte(v))
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} else if v <= math.MaxUint16 {
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e.e.encWr.writen1(bd | 0x01)
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bigen.writeUint16(e.e.w(), uint16(v))
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} else if v <= math.MaxUint32 {
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e.encIntegerPrune32(bd, pos, v)
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} else {
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e.encIntegerPrune64(bd, pos, v)
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}
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}
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func (e *bincEncDriver) EncodeExt(v interface{}, basetype reflect.Type, xtag uint64, ext Ext) {
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var bs0, bs []byte
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if ext == SelfExt {
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bs0 = e.e.blist.get(1024)
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bs = bs0
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e.e.sideEncode(v, basetype, &bs)
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} else {
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bs = ext.WriteExt(v)
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}
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if bs == nil {
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e.EncodeNil()
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goto END
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}
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e.encodeExtPreamble(uint8(xtag), len(bs))
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e.e.encWr.writeb(bs)
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END:
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if ext == SelfExt {
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e.e.blist.put(bs)
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if !byteSliceSameData(bs0, bs) {
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e.e.blist.put(bs0)
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}
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}
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}
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func (e *bincEncDriver) EncodeRawExt(re *RawExt) {
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e.encodeExtPreamble(uint8(re.Tag), len(re.Data))
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e.e.encWr.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.e.encWr.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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}
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func (e *bincEncDriver) WriteMapStart(length int) {
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e.encLen(bincVdMap<<4, uint64(length))
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}
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func (e *bincEncDriver) EncodeSymbol(v string) {
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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.e.encWr.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.e.encWr.writen2(bincVdSymbol<<4, byte(ui))
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} else {
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e.e.encWr.writen1(bincVdSymbol<<4 | 0x8)
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bigen.writeUint16(e.e.w(), ui)
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}
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} else {
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e.e.seq++
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ui = e.e.seq
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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.e.encWr.writen2(bincVdSymbol<<4|0x0|0x4|lenprec, byte(ui))
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} else {
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e.e.encWr.writen1(bincVdSymbol<<4 | 0x8 | 0x4 | lenprec)
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bigen.writeUint16(e.e.w(), ui)
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}
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if lenprec == 0 {
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e.e.encWr.writen1(byte(l))
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} else if lenprec == 1 {
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bigen.writeUint16(e.e.w(), uint16(l))
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} else if lenprec == 2 {
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bigen.writeUint32(e.e.w(), uint32(l))
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} else {
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bigen.writeUint64(e.e.w(), uint64(l))
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}
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e.e.encWr.writestr(v)
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}
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}
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func (e *bincEncDriver) EncodeString(v string) {
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if e.h.StringToRaw {
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e.encLen(bincVdByteArray<<4, uint64(len(v)))
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if len(v) > 0 {
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e.e.encWr.writestr(v)
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}
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return
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}
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e.EncodeStringEnc(cUTF8, v)
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}
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func (e *bincEncDriver) EncodeStringEnc(c charEncoding, v string) {
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if e.e.c == containerMapKey && c == cUTF8 && (e.h.AsSymbols == 1) {
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e.EncodeSymbol(v)
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return
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}
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e.encLen(bincVdString<<4, uint64(len(v)))
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if len(v) > 0 {
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e.e.encWr.writestr(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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e.encLen(bincVdByteArray<<4, uint64(len(v)))
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if len(v) > 0 {
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e.e.encWr.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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// MARKER: we currently only support UTF-8 (string) and RAW (bytearray).
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// We should consider supporting bincUnicodeOther.
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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.e.encWr.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) {
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if v <= math.MaxUint8 {
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e.e.encWr.writen2(bd, byte(v))
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} else if v <= math.MaxUint16 {
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e.e.encWr.writen1(bd | 0x01)
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bigen.writeUint16(e.e.w(), uint16(v))
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} else if v <= math.MaxUint32 {
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e.e.encWr.writen1(bd | 0x02)
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bigen.writeUint32(e.e.w(), uint32(v))
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} else {
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e.e.encWr.writen1(bd | 0x03)
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bigen.writeUint64(e.e.w(), uint64(v))
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}
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}
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//------------------------------------
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type bincDecState struct {
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bdRead bool
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bd byte
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vd byte
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vs byte
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_ bool
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// MARKER: consider using binary search here instead of a map (ie bincDecSymbol)
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s map[uint16][]byte
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}
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func (x bincDecState) captureState() interface{} { return x }
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func (x *bincDecState) resetState() { *x = bincDecState{} }
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func (x *bincDecState) reset() { x.resetState() }
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func (x *bincDecState) restoreState(v interface{}) { *x = v.(bincDecState) }
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type bincDecDriver struct {
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decDriverNoopContainerReader
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decDriverNoopNumberHelper
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noBuiltInTypes
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h *BincHandle
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bincDecState
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d Decoder
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}
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func (d *bincDecDriver) decoder() *Decoder {
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return &d.d
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}
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func (d *bincDecDriver) descBd() string {
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return sprintf("%v (%s)", d.bd, bincdescbd(d.bd))
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}
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func (d *bincDecDriver) readNextBd() {
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d.bd = d.d.decRd.readn1()
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d.vd = d.bd >> 4
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d.vs = d.bd & 0x0f
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d.bdRead = true
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}
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func (d *bincDecDriver) advanceNil() (null bool) {
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if !d.bdRead {
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d.readNextBd()
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}
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if d.bd == bincBdNil {
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d.bdRead = false
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return true // null = true
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}
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return
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}
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func (d *bincDecDriver) TryNil() bool {
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return d.advanceNil()
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}
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func (d *bincDecDriver) ContainerType() (vt valueType) {
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if !d.bdRead {
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d.readNextBd()
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}
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if d.bd == bincBdNil {
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d.bdRead = false
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return valueTypeNil
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} else if d.vd == bincVdByteArray {
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return valueTypeBytes
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} else if d.vd == bincVdString {
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return valueTypeString
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} else if d.vd == bincVdArray {
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return valueTypeArray
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} else if d.vd == bincVdMap {
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return valueTypeMap
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}
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return valueTypeUnset
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}
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func (d *bincDecDriver) DecodeTime() (t time.Time) {
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if d.advanceNil() {
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return
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}
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if d.vd != bincVdTimestamp {
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d.d.errorf("cannot decode time - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
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}
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t, err := bincDecodeTime(d.d.decRd.readx(uint(d.vs)))
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halt.onerror(err)
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d.bdRead = false
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return
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}
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|
|
func (d *bincDecDriver) decFloatPruned(maxlen uint8) {
|
|
l := d.d.decRd.readn1()
|
|
if l > maxlen {
|
|
d.d.errorf("cannot read float - at most %v bytes used to represent float - received %v bytes", maxlen, l)
|
|
}
|
|
for i := l; i < maxlen; i++ {
|
|
d.d.b[i] = 0
|
|
}
|
|
d.d.decRd.readb(d.d.b[0:l])
|
|
}
|
|
|
|
func (d *bincDecDriver) decFloatPre32() (b [4]byte) {
|
|
if d.vs&0x8 == 0 {
|
|
b = d.d.decRd.readn4()
|
|
} else {
|
|
d.decFloatPruned(4)
|
|
copy(b[:], d.d.b[:])
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) decFloatPre64() (b [8]byte) {
|
|
if d.vs&0x8 == 0 {
|
|
b = d.d.decRd.readn8()
|
|
} else {
|
|
d.decFloatPruned(8)
|
|
copy(b[:], d.d.b[:])
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) decFloatVal() (f float64) {
|
|
switch d.vs & 0x7 {
|
|
case bincFlBin32:
|
|
f = float64(math.Float32frombits(bigen.Uint32(d.decFloatPre32())))
|
|
case bincFlBin64:
|
|
f = math.Float64frombits(bigen.Uint64(d.decFloatPre64()))
|
|
default:
|
|
// ok = false
|
|
d.d.errorf("read float supports only float32/64 - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) decUint() (v uint64) {
|
|
switch d.vs {
|
|
case 0:
|
|
v = uint64(d.d.decRd.readn1())
|
|
case 1:
|
|
v = uint64(bigen.Uint16(d.d.decRd.readn2()))
|
|
case 2:
|
|
b3 := d.d.decRd.readn3()
|
|
var b [4]byte
|
|
copy(b[1:], b3[:])
|
|
v = uint64(bigen.Uint32(b))
|
|
case 3:
|
|
v = uint64(bigen.Uint32(d.d.decRd.readn4()))
|
|
case 4, 5, 6:
|
|
var b [8]byte
|
|
lim := 7 - d.vs
|
|
bs := d.d.b[lim:8]
|
|
d.d.decRd.readb(bs)
|
|
copy(b[lim:], bs)
|
|
v = bigen.Uint64(b)
|
|
case 7:
|
|
v = bigen.Uint64(d.d.decRd.readn8())
|
|
default:
|
|
d.d.errorf("unsigned integers with greater than 64 bits of precision not supported: d.vs: %v %x", d.vs, d.vs)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) uintBytes() (bs []byte) {
|
|
switch d.vs {
|
|
case 0:
|
|
bs = d.d.b[:1]
|
|
bs[0] = d.d.decRd.readn1()
|
|
case 1:
|
|
bs = d.d.b[:2]
|
|
d.d.decRd.readb(bs)
|
|
case 2:
|
|
bs = d.d.b[:3]
|
|
d.d.decRd.readb(bs)
|
|
case 3:
|
|
bs = d.d.b[:4]
|
|
d.d.decRd.readb(bs)
|
|
case 4, 5, 6:
|
|
lim := 7 - d.vs
|
|
bs = d.d.b[lim:8]
|
|
d.d.decRd.readb(bs)
|
|
case 7:
|
|
bs = d.d.b[:8]
|
|
d.d.decRd.readb(bs)
|
|
default:
|
|
d.d.errorf("unsigned integers with greater than 64 bits of precision not supported: d.vs: %v %x", d.vs, d.vs)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) decInteger() (ui uint64, neg, ok bool) {
|
|
ok = true
|
|
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 {
|
|
ok = false
|
|
// d.d.errorf("integer decode has invalid special value %x-%x/%s", d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
} else {
|
|
ok = false
|
|
// d.d.errorf("integer can only be decoded from int/uint. d.bd: 0x%x, d.vd: 0x%x", d.bd, d.vd)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) decFloat() (f float64, ok bool) {
|
|
ok = true
|
|
vd, vs := d.vd, d.vs
|
|
if vd == bincVdSpecial {
|
|
if vs == bincSpNan {
|
|
f = math.NaN()
|
|
} else if vs == bincSpPosInf {
|
|
f = math.Inf(1)
|
|
} else if vs == bincSpZeroFloat || vs == bincSpZero {
|
|
|
|
} else if vs == bincSpNegInf {
|
|
f = math.Inf(-1)
|
|
} else {
|
|
ok = false
|
|
// d.d.errorf("float - invalid special value %x-%x/%s", d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
} else if vd == bincVdFloat {
|
|
f = d.decFloatVal()
|
|
} else {
|
|
ok = false
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeInt64() (i int64) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
i = decNegintPosintFloatNumberHelper{&d.d}.int64(d.decInteger())
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeUint64() (ui uint64) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
ui = decNegintPosintFloatNumberHelper{&d.d}.uint64(d.decInteger())
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeFloat64() (f float64) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
f = decNegintPosintFloatNumberHelper{&d.d}.float64(d.decFloat())
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeBool() (b bool) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
if d.bd == (bincVdSpecial | bincSpFalse) {
|
|
// b = false
|
|
} else if d.bd == (bincVdSpecial | bincSpTrue) {
|
|
b = true
|
|
} else {
|
|
d.d.errorf("bool - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) ReadMapStart() (length int) {
|
|
if d.advanceNil() {
|
|
return containerLenNil
|
|
}
|
|
if d.vd != bincVdMap {
|
|
d.d.errorf("map - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
length = d.decLen()
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) ReadArrayStart() (length int) {
|
|
if d.advanceNil() {
|
|
return containerLenNil
|
|
}
|
|
if d.vd != bincVdArray {
|
|
d.d.errorf("array - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
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.d.decRd.readn1())
|
|
} else if x == 1 {
|
|
v = uint64(bigen.Uint16(d.d.decRd.readn2()))
|
|
} else if x == 2 {
|
|
v = uint64(bigen.Uint32(d.d.decRd.readn4()))
|
|
} else {
|
|
v = bigen.Uint64(d.d.decRd.readn8())
|
|
}
|
|
return
|
|
}
|
|
|
|
// func (d *bincDecDriver) decStringBytes(bs []byte, zerocopy bool) (bs2 []byte) {
|
|
func (d *bincDecDriver) DecodeStringAsBytes() (bs2 []byte) {
|
|
d.d.decByteState = decByteStateNone
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
var slen = -1
|
|
switch d.vd {
|
|
case bincVdString, bincVdByteArray:
|
|
slen = d.decLen()
|
|
if d.d.bytes {
|
|
d.d.decByteState = decByteStateZerocopy
|
|
bs2 = d.d.decRd.rb.readx(uint(slen))
|
|
} else {
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
bs2 = decByteSlice(d.d.r(), slen, d.d.h.MaxInitLen, d.d.b[:])
|
|
}
|
|
case bincVdSymbol:
|
|
// zerocopy doesn't apply for symbols,
|
|
// as the values must be stored in a table for later use.
|
|
var symbol uint16
|
|
vs := d.vs
|
|
if vs&0x8 == 0 {
|
|
symbol = uint16(d.d.decRd.readn1())
|
|
} else {
|
|
symbol = uint16(bigen.Uint16(d.d.decRd.readn2()))
|
|
}
|
|
if d.s == nil {
|
|
d.s = make(map[uint16][]byte, 16)
|
|
}
|
|
|
|
if vs&0x4 == 0 {
|
|
bs2 = d.s[symbol]
|
|
} else {
|
|
switch vs & 0x3 {
|
|
case 0:
|
|
slen = int(d.d.decRd.readn1())
|
|
case 1:
|
|
slen = int(bigen.Uint16(d.d.decRd.readn2()))
|
|
case 2:
|
|
slen = int(bigen.Uint32(d.d.decRd.readn4()))
|
|
case 3:
|
|
slen = int(bigen.Uint64(d.d.decRd.readn8()))
|
|
}
|
|
// As we are using symbols, do not store any part of
|
|
// the parameter bs in the map, as it might be a shared buffer.
|
|
bs2 = decByteSlice(d.d.r(), slen, d.d.h.MaxInitLen, nil)
|
|
d.s[symbol] = bs2
|
|
}
|
|
default:
|
|
d.d.errorf("string/bytes - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
|
|
if d.h.ValidateUnicode && !utf8.Valid(bs2) {
|
|
d.d.errorf("DecodeStringAsBytes: invalid UTF-8: %s", bs2)
|
|
}
|
|
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeBytes(bs []byte) (bsOut []byte) {
|
|
d.d.decByteState = decByteStateNone
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
if d.vd == bincVdArray {
|
|
if bs == nil {
|
|
bs = d.d.b[:]
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
}
|
|
slen := d.ReadArrayStart()
|
|
var changed bool
|
|
if bs, changed = usableByteSlice(bs, slen); changed {
|
|
d.d.decByteState = decByteStateNone
|
|
}
|
|
for i := 0; i < slen; i++ {
|
|
bs[i] = uint8(chkOvf.UintV(d.DecodeUint64(), 8))
|
|
}
|
|
for i := len(bs); i < slen; i++ {
|
|
bs = append(bs, uint8(chkOvf.UintV(d.DecodeUint64(), 8)))
|
|
}
|
|
return bs
|
|
}
|
|
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))
|
|
}
|
|
d.bdRead = false
|
|
if d.d.zerocopy() {
|
|
d.d.decByteState = decByteStateZerocopy
|
|
return d.d.decRd.rb.readx(uint(clen))
|
|
}
|
|
if bs == nil {
|
|
bs = d.d.b[:]
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
}
|
|
return decByteSlice(d.d.r(), clen, d.d.h.MaxInitLen, bs)
|
|
}
|
|
|
|
func (d *bincDecDriver) DecodeExt(rv interface{}, basetype reflect.Type, xtag uint64, ext Ext) {
|
|
if xtag > 0xff {
|
|
d.d.errorf("ext: tag must be <= 0xff; got: %v", xtag)
|
|
}
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
xbs, realxtag1, zerocopy := d.decodeExtV(ext != nil, uint8(xtag))
|
|
realxtag := uint64(realxtag1)
|
|
if ext == nil {
|
|
re := rv.(*RawExt)
|
|
re.Tag = realxtag
|
|
re.setData(xbs, zerocopy)
|
|
} else if ext == SelfExt {
|
|
d.d.sideDecode(rv, basetype, xbs)
|
|
} else {
|
|
ext.ReadExt(rv, xbs)
|
|
}
|
|
}
|
|
|
|
func (d *bincDecDriver) decodeExtV(verifyTag bool, tag byte) (xbs []byte, xtag byte, zerocopy bool) {
|
|
if d.vd == bincVdCustomExt {
|
|
l := d.decLen()
|
|
xtag = d.d.decRd.readn1()
|
|
if verifyTag && xtag != tag {
|
|
d.d.errorf("wrong extension tag - got %b, expecting: %v", xtag, tag)
|
|
}
|
|
if d.d.bytes {
|
|
xbs = d.d.decRd.rb.readx(uint(l))
|
|
zerocopy = true
|
|
} else {
|
|
xbs = decByteSlice(d.d.r(), l, d.d.h.MaxInitLen, d.d.b[:])
|
|
}
|
|
} else if d.vd == bincVdByteArray {
|
|
xbs = d.DecodeBytes(nil)
|
|
} else {
|
|
d.d.errorf("ext expects extensions or byte array - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
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 %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.decFloatVal()
|
|
case bincVdString:
|
|
n.v = valueTypeString
|
|
n.s = d.d.stringZC(d.DecodeStringAsBytes())
|
|
case bincVdByteArray:
|
|
d.d.fauxUnionReadRawBytes(false)
|
|
case bincVdSymbol:
|
|
n.v = valueTypeSymbol
|
|
n.s = d.d.stringZC(d.DecodeStringAsBytes())
|
|
case bincVdTimestamp:
|
|
n.v = valueTypeTime
|
|
tt, err := bincDecodeTime(d.d.decRd.readx(uint(d.vs)))
|
|
halt.onerror(err)
|
|
n.t = tt
|
|
case bincVdCustomExt:
|
|
n.v = valueTypeExt
|
|
l := d.decLen()
|
|
n.u = uint64(d.d.decRd.readn1())
|
|
if d.d.bytes {
|
|
n.l = d.d.decRd.rb.readx(uint(l))
|
|
} else {
|
|
n.l = decByteSlice(d.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)
|
|
}
|
|
}
|
|
|
|
func (d *bincDecDriver) nextValueBytes(v0 []byte) (v []byte) {
|
|
if !d.bdRead {
|
|
d.readNextBd()
|
|
}
|
|
v = v0
|
|
var h = decNextValueBytesHelper{d: &d.d}
|
|
var cursor = d.d.rb.c - 1
|
|
h.append1(&v, d.bd)
|
|
v = d.nextValueBytesBdReadR(v)
|
|
d.bdRead = false
|
|
h.bytesRdV(&v, cursor)
|
|
return
|
|
}
|
|
|
|
func (d *bincDecDriver) nextValueBytesR(v0 []byte) (v []byte) {
|
|
d.readNextBd()
|
|
v = v0
|
|
var h = decNextValueBytesHelper{d: &d.d}
|
|
h.append1(&v, d.bd)
|
|
return d.nextValueBytesBdReadR(v)
|
|
}
|
|
|
|
func (d *bincDecDriver) nextValueBytesBdReadR(v0 []byte) (v []byte) {
|
|
v = v0
|
|
var h = decNextValueBytesHelper{d: &d.d}
|
|
|
|
fnLen := func(vs byte) uint {
|
|
switch vs {
|
|
case 0:
|
|
x := d.d.decRd.readn1()
|
|
h.append1(&v, x)
|
|
return uint(x)
|
|
case 1:
|
|
x := d.d.decRd.readn2()
|
|
h.appendN(&v, x[:]...)
|
|
return uint(bigen.Uint16(x))
|
|
case 2:
|
|
x := d.d.decRd.readn4()
|
|
h.appendN(&v, x[:]...)
|
|
return uint(bigen.Uint32(x))
|
|
case 3:
|
|
x := d.d.decRd.readn8()
|
|
h.appendN(&v, x[:]...)
|
|
return uint(bigen.Uint64(x))
|
|
default:
|
|
return uint(vs - 4)
|
|
}
|
|
}
|
|
|
|
var clen uint
|
|
|
|
switch d.vd {
|
|
case bincVdSpecial:
|
|
switch d.vs {
|
|
case bincSpNil, bincSpFalse, bincSpTrue, bincSpNan, bincSpPosInf: // pass
|
|
case bincSpNegInf, bincSpZeroFloat, bincSpZero, bincSpNegOne: // pass
|
|
default:
|
|
d.d.errorf("cannot infer value - unrecognized special value %x-%x/%s", d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
case bincVdSmallInt: // pass
|
|
case bincVdPosInt, bincVdNegInt:
|
|
bs := d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
case bincVdFloat:
|
|
fn := func(xlen byte) {
|
|
if d.vs&0x8 != 0 {
|
|
xlen = d.d.decRd.readn1()
|
|
h.append1(&v, xlen)
|
|
if xlen > 8 {
|
|
d.d.errorf("cannot read float - at most 8 bytes used to represent float - received %v bytes", xlen)
|
|
}
|
|
}
|
|
d.d.decRd.readb(d.d.b[:xlen])
|
|
h.appendN(&v, d.d.b[:xlen]...)
|
|
}
|
|
switch d.vs & 0x7 {
|
|
case bincFlBin32:
|
|
fn(4)
|
|
case bincFlBin64:
|
|
fn(8)
|
|
default:
|
|
d.d.errorf("read float supports only float32/64 - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
case bincVdString, bincVdByteArray:
|
|
clen = fnLen(d.vs)
|
|
h.appendN(&v, d.d.decRd.readx(clen)...)
|
|
case bincVdSymbol:
|
|
if d.vs&0x8 == 0 {
|
|
h.append1(&v, d.d.decRd.readn1())
|
|
} else {
|
|
h.appendN(&v, d.d.decRd.rb.readx(2)...)
|
|
}
|
|
if d.vs&0x4 != 0 {
|
|
clen = fnLen(d.vs & 0x3)
|
|
h.appendN(&v, d.d.decRd.readx(clen)...)
|
|
}
|
|
case bincVdTimestamp:
|
|
h.appendN(&v, d.d.decRd.readx(uint(d.vs))...)
|
|
case bincVdCustomExt:
|
|
clen = fnLen(d.vs)
|
|
h.append1(&v, d.d.decRd.readn1()) // tag
|
|
h.appendN(&v, d.d.decRd.readx(clen)...)
|
|
case bincVdArray:
|
|
clen = fnLen(d.vs)
|
|
for i := uint(0); i < clen; i++ {
|
|
v = d.nextValueBytesR(v)
|
|
}
|
|
case bincVdMap:
|
|
clen = fnLen(d.vs)
|
|
for i := uint(0); i < clen; i++ {
|
|
v = d.nextValueBytesR(v)
|
|
v = d.nextValueBytesR(v)
|
|
}
|
|
default:
|
|
d.d.errorf("cannot infer value - %s %x-%x/%s", msgBadDesc, d.vd, d.vs, bincdesc(d.vd, d.vs))
|
|
}
|
|
return
|
|
}
|
|
|
|
//------------------------------------
|
|
|
|
// 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, ...
|
|
|
|
// _ [7]uint64 // padding (cache-aligned)
|
|
}
|
|
|
|
// Name returns the name of the handle: binc
|
|
func (h *BincHandle) Name() string { return "binc" }
|
|
|
|
func (h *BincHandle) desc(bd byte) string { return bincdesc(bd>>4, bd&0x0f) }
|
|
|
|
func (h *BincHandle) newEncDriver() encDriver {
|
|
var e = &bincEncDriver{h: h}
|
|
e.e.e = e
|
|
e.e.init(h)
|
|
e.reset()
|
|
return e
|
|
}
|
|
|
|
func (h *BincHandle) newDecDriver() decDriver {
|
|
d := &bincDecDriver{h: h}
|
|
d.d.d = d
|
|
d.d.init(h)
|
|
d.reset()
|
|
return d
|
|
}
|
|
|
|
// 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 := rv2i(rv).(time.Time)
|
|
tsecs, tnsecs := t.Unix(), t.Nanosecond()
|
|
var (
|
|
bd byte
|
|
bs [16]byte
|
|
i int = 1
|
|
)
|
|
l := t.Location()
|
|
if l == time.UTC {
|
|
l = nil
|
|
}
|
|
if tsecs != 0 {
|
|
bd = bd | 0x80
|
|
btmp := bigen.PutUint64(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
|
|
btmp := bigen.PutUint32(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)
|
|
btmp := bigen.PutUint16(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)
|
|
}
|
|
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 printf.d.
|
|
// Zone name is in form: UTC-08:00.
|
|
// Note that Go Libs do not give access to dst flag, so we ignore dst bits
|
|
|
|
tz = bigen.Uint16([2]byte{bs[i], bs[i+1]})
|
|
// 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)
|