717 lines
16 KiB
Go
717 lines
16 KiB
Go
// 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 (
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cborMajorUint byte = iota
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cborMajorNegInt
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cborMajorBytes
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cborMajorText
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cborMajorArray
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cborMajorMap
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cborMajorTag
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cborMajorOther
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)
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const (
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cborBdFalse byte = 0xf4 + iota
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cborBdTrue
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cborBdNil
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cborBdUndefined
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cborBdExt
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cborBdFloat16
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cborBdFloat32
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cborBdFloat64
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)
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const (
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cborBdIndefiniteBytes byte = 0x5f
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cborBdIndefiniteString = 0x7f
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cborBdIndefiniteArray = 0x9f
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cborBdIndefiniteMap = 0xbf
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cborBdBreak = 0xff
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)
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// These define some in-stream descriptors for
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// manual encoding e.g. when doing explicit indefinite-length
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const (
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CborStreamBytes byte = 0x5f
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CborStreamString = 0x7f
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CborStreamArray = 0x9f
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CborStreamMap = 0xbf
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CborStreamBreak = 0xff
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)
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const (
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cborBaseUint byte = 0x00
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cborBaseNegInt = 0x20
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cborBaseBytes = 0x40
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cborBaseString = 0x60
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cborBaseArray = 0x80
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cborBaseMap = 0xa0
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cborBaseTag = 0xc0
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cborBaseSimple = 0xe0
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)
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// -------------------
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type cborEncDriver struct {
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noBuiltInTypes
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encDriverNoopContainerWriter
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// encNoSeparator
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e *Encoder
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w encWriter
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h *CborHandle
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x [8]byte
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_ [3]uint64 // padding
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}
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func (e *cborEncDriver) EncodeNil() {
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e.w.writen1(cborBdNil)
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}
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func (e *cborEncDriver) EncodeBool(b bool) {
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if b {
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e.w.writen1(cborBdTrue)
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} else {
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e.w.writen1(cborBdFalse)
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}
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}
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func (e *cborEncDriver) EncodeFloat32(f float32) {
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e.w.writen1(cborBdFloat32)
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bigenHelper{e.x[:4], e.w}.writeUint32(math.Float32bits(f))
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}
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func (e *cborEncDriver) EncodeFloat64(f float64) {
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e.w.writen1(cborBdFloat64)
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bigenHelper{e.x[:8], e.w}.writeUint64(math.Float64bits(f))
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}
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func (e *cborEncDriver) encUint(v uint64, bd byte) {
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if v <= 0x17 {
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e.w.writen1(byte(v) + bd)
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} else if v <= math.MaxUint8 {
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e.w.writen2(bd+0x18, uint8(v))
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} else if v <= math.MaxUint16 {
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e.w.writen1(bd + 0x19)
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bigenHelper{e.x[:2], e.w}.writeUint16(uint16(v))
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} else if v <= math.MaxUint32 {
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e.w.writen1(bd + 0x1a)
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bigenHelper{e.x[:4], e.w}.writeUint32(uint32(v))
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} else { // if v <= math.MaxUint64 {
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e.w.writen1(bd + 0x1b)
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bigenHelper{e.x[:8], e.w}.writeUint64(v)
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}
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}
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func (e *cborEncDriver) EncodeInt(v int64) {
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if v < 0 {
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e.encUint(uint64(-1-v), cborBaseNegInt)
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} else {
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e.encUint(uint64(v), cborBaseUint)
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}
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}
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func (e *cborEncDriver) EncodeUint(v uint64) {
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e.encUint(v, cborBaseUint)
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}
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func (e *cborEncDriver) encLen(bd byte, length int) {
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e.encUint(uint64(length), bd)
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}
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func (e *cborEncDriver) EncodeTime(t time.Time) {
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if t.IsZero() {
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e.EncodeNil()
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} else if e.h.TimeRFC3339 {
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e.encUint(0, cborBaseTag)
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e.EncodeString(cUTF8, t.Format(time.RFC3339Nano))
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} else {
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e.encUint(1, cborBaseTag)
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t = t.UTC().Round(time.Microsecond)
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sec, nsec := t.Unix(), uint64(t.Nanosecond())
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if nsec == 0 {
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e.EncodeInt(sec)
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} else {
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e.EncodeFloat64(float64(sec) + float64(nsec)/1e9)
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}
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}
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}
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func (e *cborEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, en *Encoder) {
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e.encUint(uint64(xtag), cborBaseTag)
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if v := ext.ConvertExt(rv); v == nil {
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e.EncodeNil()
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} else {
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en.encode(v)
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}
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}
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func (e *cborEncDriver) EncodeRawExt(re *RawExt, en *Encoder) {
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e.encUint(uint64(re.Tag), cborBaseTag)
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if false && re.Data != nil {
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en.encode(re.Data)
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} else if re.Value != nil {
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en.encode(re.Value)
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} else {
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e.EncodeNil()
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}
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}
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func (e *cborEncDriver) WriteArrayStart(length int) {
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if e.h.IndefiniteLength {
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e.w.writen1(cborBdIndefiniteArray)
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} else {
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e.encLen(cborBaseArray, length)
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}
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}
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func (e *cborEncDriver) WriteMapStart(length int) {
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if e.h.IndefiniteLength {
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e.w.writen1(cborBdIndefiniteMap)
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} else {
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e.encLen(cborBaseMap, length)
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}
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}
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func (e *cborEncDriver) WriteMapEnd() {
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if e.h.IndefiniteLength {
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e.w.writen1(cborBdBreak)
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}
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}
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func (e *cborEncDriver) WriteArrayEnd() {
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if e.h.IndefiniteLength {
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e.w.writen1(cborBdBreak)
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}
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}
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func (e *cborEncDriver) EncodeString(c charEncoding, v string) {
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e.encStringBytesS(cborBaseString, v)
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}
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func (e *cborEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
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if v == nil {
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e.EncodeNil()
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} else if c == cRAW {
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e.encStringBytesS(cborBaseBytes, stringView(v))
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} else {
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e.encStringBytesS(cborBaseString, stringView(v))
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}
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}
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func (e *cborEncDriver) encStringBytesS(bb byte, v string) {
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if e.h.IndefiniteLength {
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if bb == cborBaseBytes {
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e.w.writen1(cborBdIndefiniteBytes)
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} else {
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e.w.writen1(cborBdIndefiniteString)
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}
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blen := len(v) / 4
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if blen == 0 {
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blen = 64
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} else if blen > 1024 {
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blen = 1024
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}
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for i := 0; i < len(v); {
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var v2 string
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i2 := i + blen
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if i2 < len(v) {
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v2 = v[i:i2]
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} else {
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v2 = v[i:]
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}
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e.encLen(bb, len(v2))
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e.w.writestr(v2)
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i = i2
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}
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e.w.writen1(cborBdBreak)
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} else {
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e.encLen(bb, len(v))
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e.w.writestr(v)
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}
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}
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// ----------------------
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type cborDecDriver struct {
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d *Decoder
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h *CborHandle
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r decReader
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// b [scratchByteArrayLen]byte
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br bool // bytes reader
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bdRead bool
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bd byte
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noBuiltInTypes
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// decNoSeparator
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decDriverNoopContainerReader
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_ [3]uint64 // padding
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}
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func (d *cborDecDriver) readNextBd() {
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d.bd = d.r.readn1()
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d.bdRead = true
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}
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func (d *cborDecDriver) uncacheRead() {
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if d.bdRead {
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d.r.unreadn1()
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d.bdRead = false
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}
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}
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func (d *cborDecDriver) 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 == cborBdNil {
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return valueTypeNil
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} else if d.bd == cborBdIndefiniteBytes || (d.bd >= cborBaseBytes && d.bd < cborBaseString) {
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return valueTypeBytes
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} else if d.bd == cborBdIndefiniteString || (d.bd >= cborBaseString && d.bd < cborBaseArray) {
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return valueTypeString
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} else if d.bd == cborBdIndefiniteArray || (d.bd >= cborBaseArray && d.bd < cborBaseMap) {
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return valueTypeArray
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} else if d.bd == cborBdIndefiniteMap || (d.bd >= cborBaseMap && d.bd < cborBaseTag) {
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return valueTypeMap
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}
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// else {
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// d.d.errorf("isContainerType: unsupported parameter: %v", vt)
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// }
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return valueTypeUnset
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}
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func (d *cborDecDriver) TryDecodeAsNil() bool {
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if !d.bdRead {
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d.readNextBd()
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}
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// treat Nil and Undefined as nil values
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if d.bd == cborBdNil || d.bd == cborBdUndefined {
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d.bdRead = false
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return true
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}
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return false
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}
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func (d *cborDecDriver) CheckBreak() 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 == cborBdBreak {
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d.bdRead = false
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return true
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}
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return false
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}
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func (d *cborDecDriver) decUint() (ui uint64) {
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v := d.bd & 0x1f
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if v <= 0x17 {
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ui = uint64(v)
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} else {
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if v == 0x18 {
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ui = uint64(d.r.readn1())
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} else if v == 0x19 {
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ui = uint64(bigen.Uint16(d.r.readx(2)))
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} else if v == 0x1a {
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ui = uint64(bigen.Uint32(d.r.readx(4)))
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} else if v == 0x1b {
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ui = uint64(bigen.Uint64(d.r.readx(8)))
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} else {
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d.d.errorf("decUint: Invalid descriptor: %v", d.bd)
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return
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}
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}
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return
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}
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func (d *cborDecDriver) decCheckInteger() (neg bool) {
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if !d.bdRead {
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d.readNextBd()
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}
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major := d.bd >> 5
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if major == cborMajorUint {
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} else if major == cborMajorNegInt {
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neg = true
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} else {
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d.d.errorf("invalid major: %v (bd: %v)", major, d.bd)
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return
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}
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return
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}
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func (d *cborDecDriver) DecodeInt64() (i int64) {
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neg := d.decCheckInteger()
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ui := d.decUint()
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// check if this number can be converted to an int without overflow
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if neg {
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i = -(chkOvf.SignedIntV(ui + 1))
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} else {
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i = chkOvf.SignedIntV(ui)
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}
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d.bdRead = false
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return
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}
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func (d *cborDecDriver) DecodeUint64() (ui uint64) {
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if d.decCheckInteger() {
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d.d.errorf("Assigning negative signed value to unsigned type")
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return
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}
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ui = d.decUint()
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d.bdRead = false
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return
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}
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func (d *cborDecDriver) DecodeFloat64() (f float64) {
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if !d.bdRead {
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d.readNextBd()
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}
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if bd := d.bd; bd == cborBdFloat16 {
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f = float64(math.Float32frombits(halfFloatToFloatBits(bigen.Uint16(d.r.readx(2)))))
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} else if bd == cborBdFloat32 {
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f = float64(math.Float32frombits(bigen.Uint32(d.r.readx(4))))
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} else if bd == cborBdFloat64 {
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f = math.Float64frombits(bigen.Uint64(d.r.readx(8)))
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} else if bd >= cborBaseUint && bd < cborBaseBytes {
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f = float64(d.DecodeInt64())
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} else {
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d.d.errorf("Float only valid from float16/32/64: Invalid descriptor: %v", bd)
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return
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}
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d.bdRead = false
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return
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}
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// bool can be decoded from bool only (single byte).
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func (d *cborDecDriver) DecodeBool() (b bool) {
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if !d.bdRead {
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d.readNextBd()
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}
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if bd := d.bd; bd == cborBdTrue {
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b = true
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} else if bd == cborBdFalse {
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} else {
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d.d.errorf("Invalid single-byte value for bool: %s: %x", msgBadDesc, d.bd)
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return
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}
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d.bdRead = false
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return
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}
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func (d *cborDecDriver) ReadMapStart() (length int) {
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if !d.bdRead {
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d.readNextBd()
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}
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d.bdRead = false
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if d.bd == cborBdIndefiniteMap {
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return -1
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}
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return d.decLen()
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}
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func (d *cborDecDriver) ReadArrayStart() (length int) {
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if !d.bdRead {
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d.readNextBd()
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}
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d.bdRead = false
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if d.bd == cborBdIndefiniteArray {
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return -1
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}
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return d.decLen()
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}
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func (d *cborDecDriver) decLen() int {
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return int(d.decUint())
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}
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func (d *cborDecDriver) decAppendIndefiniteBytes(bs []byte) []byte {
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d.bdRead = false
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for {
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if d.CheckBreak() {
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break
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}
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if major := d.bd >> 5; major != cborMajorBytes && major != cborMajorText {
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d.d.errorf("expect bytes/string major type in indefinite string/bytes;"+
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" got: %v, byte: %v", major, d.bd)
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return nil
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}
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n := d.decLen()
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oldLen := len(bs)
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newLen := oldLen + n
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if newLen > cap(bs) {
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bs2 := make([]byte, newLen, 2*cap(bs)+n)
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copy(bs2, bs)
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bs = bs2
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} else {
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bs = bs[:newLen]
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}
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d.r.readb(bs[oldLen:newLen])
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// bs = append(bs, d.r.readn()...)
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d.bdRead = false
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}
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d.bdRead = false
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return bs
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}
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func (d *cborDecDriver) DecodeBytes(bs []byte, zerocopy bool) (bsOut []byte) {
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if !d.bdRead {
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d.readNextBd()
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}
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if d.bd == cborBdNil || d.bd == cborBdUndefined {
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d.bdRead = false
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return nil
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}
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if d.bd == cborBdIndefiniteBytes || d.bd == cborBdIndefiniteString {
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d.bdRead = false
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if bs == nil {
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if zerocopy {
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return d.decAppendIndefiniteBytes(d.d.b[:0])
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}
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return d.decAppendIndefiniteBytes(zeroByteSlice)
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}
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return d.decAppendIndefiniteBytes(bs[:0])
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}
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// check if an "array" of uint8's (see ContainerType for how to infer if an array)
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if d.bd == cborBdIndefiniteArray || (d.bd >= cborBaseArray && d.bd < cborBaseMap) {
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bsOut, _ = fastpathTV.DecSliceUint8V(bs, true, d.d)
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return
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}
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clen := d.decLen()
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d.bdRead = false
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if zerocopy {
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if d.br {
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return d.r.readx(clen)
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} else if len(bs) == 0 {
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bs = d.d.b[:]
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}
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}
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return decByteSlice(d.r, clen, d.h.MaxInitLen, bs)
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}
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func (d *cborDecDriver) DecodeString() (s string) {
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return string(d.DecodeBytes(d.d.b[:], true))
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}
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func (d *cborDecDriver) DecodeStringAsBytes() (s []byte) {
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return d.DecodeBytes(d.d.b[:], true)
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}
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func (d *cborDecDriver) DecodeTime() (t time.Time) {
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if !d.bdRead {
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d.readNextBd()
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}
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if d.bd == cborBdNil || d.bd == cborBdUndefined {
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d.bdRead = false
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return
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}
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xtag := d.decUint()
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d.bdRead = false
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return d.decodeTime(xtag)
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}
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func (d *cborDecDriver) decodeTime(xtag uint64) (t time.Time) {
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if !d.bdRead {
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d.readNextBd()
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}
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switch xtag {
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case 0:
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var err error
|
|
if t, err = time.Parse(time.RFC3339, stringView(d.DecodeStringAsBytes())); err != nil {
|
|
d.d.errorv(err)
|
|
}
|
|
case 1:
|
|
// decode an int64 or a float, and infer time.Time from there.
|
|
// for floats, round to microseconds, as that is what is guaranteed to fit well.
|
|
switch {
|
|
case d.bd == cborBdFloat16, d.bd == cborBdFloat32:
|
|
f1, f2 := math.Modf(d.DecodeFloat64())
|
|
t = time.Unix(int64(f1), int64(f2*1e9))
|
|
case d.bd == cborBdFloat64:
|
|
f1, f2 := math.Modf(d.DecodeFloat64())
|
|
t = time.Unix(int64(f1), int64(f2*1e9))
|
|
case d.bd >= cborBaseUint && d.bd < cborBaseNegInt,
|
|
d.bd >= cborBaseNegInt && d.bd < cborBaseBytes:
|
|
t = time.Unix(d.DecodeInt64(), 0)
|
|
default:
|
|
d.d.errorf("time.Time can only be decoded from a number (or RFC3339 string)")
|
|
}
|
|
default:
|
|
d.d.errorf("invalid tag for time.Time - expecting 0 or 1, got 0x%x", xtag)
|
|
}
|
|
t = t.UTC().Round(time.Microsecond)
|
|
return
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
|
|
if !d.bdRead {
|
|
d.readNextBd()
|
|
}
|
|
u := d.decUint()
|
|
d.bdRead = false
|
|
realxtag = u
|
|
if ext == nil {
|
|
re := rv.(*RawExt)
|
|
re.Tag = realxtag
|
|
d.d.decode(&re.Value)
|
|
} else if xtag != realxtag {
|
|
d.d.errorf("Wrong extension tag. Got %b. Expecting: %v", realxtag, xtag)
|
|
return
|
|
} else {
|
|
var v interface{}
|
|
d.d.decode(&v)
|
|
ext.UpdateExt(rv, v)
|
|
}
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeNaked() {
|
|
if !d.bdRead {
|
|
d.readNextBd()
|
|
}
|
|
|
|
n := d.d.n
|
|
var decodeFurther bool
|
|
|
|
switch d.bd {
|
|
case cborBdNil:
|
|
n.v = valueTypeNil
|
|
case cborBdFalse:
|
|
n.v = valueTypeBool
|
|
n.b = false
|
|
case cborBdTrue:
|
|
n.v = valueTypeBool
|
|
n.b = true
|
|
case cborBdFloat16, cborBdFloat32, cborBdFloat64:
|
|
n.v = valueTypeFloat
|
|
n.f = d.DecodeFloat64()
|
|
case cborBdIndefiniteBytes:
|
|
n.v = valueTypeBytes
|
|
n.l = d.DecodeBytes(nil, false)
|
|
case cborBdIndefiniteString:
|
|
n.v = valueTypeString
|
|
n.s = d.DecodeString()
|
|
case cborBdIndefiniteArray:
|
|
n.v = valueTypeArray
|
|
decodeFurther = true
|
|
case cborBdIndefiniteMap:
|
|
n.v = valueTypeMap
|
|
decodeFurther = true
|
|
default:
|
|
switch {
|
|
case d.bd >= cborBaseUint && d.bd < cborBaseNegInt:
|
|
if d.h.SignedInteger {
|
|
n.v = valueTypeInt
|
|
n.i = d.DecodeInt64()
|
|
} else {
|
|
n.v = valueTypeUint
|
|
n.u = d.DecodeUint64()
|
|
}
|
|
case d.bd >= cborBaseNegInt && d.bd < cborBaseBytes:
|
|
n.v = valueTypeInt
|
|
n.i = d.DecodeInt64()
|
|
case d.bd >= cborBaseBytes && d.bd < cborBaseString:
|
|
n.v = valueTypeBytes
|
|
n.l = d.DecodeBytes(nil, false)
|
|
case d.bd >= cborBaseString && d.bd < cborBaseArray:
|
|
n.v = valueTypeString
|
|
n.s = d.DecodeString()
|
|
case d.bd >= cborBaseArray && d.bd < cborBaseMap:
|
|
n.v = valueTypeArray
|
|
decodeFurther = true
|
|
case d.bd >= cborBaseMap && d.bd < cborBaseTag:
|
|
n.v = valueTypeMap
|
|
decodeFurther = true
|
|
case d.bd >= cborBaseTag && d.bd < cborBaseSimple:
|
|
n.v = valueTypeExt
|
|
n.u = d.decUint()
|
|
n.l = nil
|
|
if n.u == 0 || n.u == 1 {
|
|
d.bdRead = false
|
|
n.v = valueTypeTime
|
|
n.t = d.decodeTime(n.u)
|
|
}
|
|
// d.bdRead = false
|
|
// d.d.decode(&re.Value) // handled by decode itself.
|
|
// decodeFurther = true
|
|
default:
|
|
d.d.errorf("decodeNaked: Unrecognized d.bd: 0x%x", d.bd)
|
|
return
|
|
}
|
|
}
|
|
|
|
if !decodeFurther {
|
|
d.bdRead = false
|
|
}
|
|
return
|
|
}
|
|
|
|
// -------------------------
|
|
|
|
// CborHandle is a Handle for the CBOR encoding format,
|
|
// defined at http://tools.ietf.org/html/rfc7049 and documented further at http://cbor.io .
|
|
//
|
|
// CBOR is comprehensively supported, including support for:
|
|
// - indefinite-length arrays/maps/bytes/strings
|
|
// - (extension) tags in range 0..0xffff (0 .. 65535)
|
|
// - half, single and double-precision floats
|
|
// - all numbers (1, 2, 4 and 8-byte signed and unsigned integers)
|
|
// - nil, true, false, ...
|
|
// - arrays and maps, bytes and text strings
|
|
//
|
|
// None of the optional extensions (with tags) defined in the spec are supported out-of-the-box.
|
|
// Users can implement them as needed (using SetExt), including spec-documented ones:
|
|
// - timestamp, BigNum, BigFloat, Decimals,
|
|
// - Encoded Text (e.g. URL, regexp, base64, MIME Message), etc.
|
|
type CborHandle struct {
|
|
binaryEncodingType
|
|
noElemSeparators
|
|
BasicHandle
|
|
|
|
// IndefiniteLength=true, means that we encode using indefinitelength
|
|
IndefiniteLength bool
|
|
|
|
// TimeRFC3339 says to encode time.Time using RFC3339 format.
|
|
// If unset, we encode time.Time using seconds past epoch.
|
|
TimeRFC3339 bool
|
|
|
|
_ [1]uint64 // padding
|
|
}
|
|
|
|
// Name returns the name of the handle: cbor
|
|
func (h *CborHandle) Name() string { return "cbor" }
|
|
|
|
// SetInterfaceExt sets an extension
|
|
func (h *CborHandle) SetInterfaceExt(rt reflect.Type, tag uint64, ext InterfaceExt) (err error) {
|
|
return h.SetExt(rt, tag, &extWrapper{bytesExtFailer{}, ext})
|
|
}
|
|
|
|
func (h *CborHandle) newEncDriver(e *Encoder) encDriver {
|
|
return &cborEncDriver{e: e, w: e.w, h: h}
|
|
}
|
|
|
|
func (h *CborHandle) newDecDriver(d *Decoder) decDriver {
|
|
return &cborDecDriver{d: d, h: h, r: d.r, br: d.bytes}
|
|
}
|
|
|
|
func (e *cborEncDriver) reset() {
|
|
e.w = e.e.w
|
|
}
|
|
|
|
func (d *cborDecDriver) reset() {
|
|
d.r, d.br = d.d.r, d.d.bytes
|
|
d.bd, d.bdRead = 0, false
|
|
}
|
|
|
|
var _ decDriver = (*cborDecDriver)(nil)
|
|
var _ encDriver = (*cborEncDriver)(nil)
|