967 lines
22 KiB
Go
967 lines
22 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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// major
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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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cborMajorString
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cborMajorArray
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cborMajorMap
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cborMajorTag
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cborMajorSimpleOrFloat
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)
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// simple
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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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// indefinite
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const (
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cborBdIndefiniteBytes byte = 0x5f
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cborBdIndefiniteString byte = 0x7f
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cborBdIndefiniteArray byte = 0x9f
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cborBdIndefiniteMap byte = 0xbf
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cborBdBreak byte = 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 byte = 0x7f
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CborStreamArray byte = 0x9f
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CborStreamMap byte = 0xbf
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CborStreamBreak byte = 0xff
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)
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// base values
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const (
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cborBaseUint byte = 0x00
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cborBaseNegInt byte = 0x20
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cborBaseBytes byte = 0x40
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cborBaseString byte = 0x60
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cborBaseArray byte = 0x80
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cborBaseMap byte = 0xa0
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cborBaseTag byte = 0xc0
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cborBaseSimple byte = 0xe0
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)
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// const (
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// cborSelfDesrTag byte = 0xd9
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// cborSelfDesrTag2 byte = 0xd9
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// cborSelfDesrTag3 byte = 0xf7
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// )
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var (
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cbordescSimpleNames = map[byte]string{
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cborBdNil: "nil",
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cborBdFalse: "false",
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cborBdTrue: "true",
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cborBdFloat16: "float",
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cborBdFloat32: "float",
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cborBdFloat64: "float",
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cborBdBreak: "break",
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}
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cbordescIndefNames = map[byte]string{
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cborBdIndefiniteBytes: "bytes*",
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cborBdIndefiniteString: "string*",
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cborBdIndefiniteArray: "array*",
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cborBdIndefiniteMap: "map*",
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}
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cbordescMajorNames = map[byte]string{
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cborMajorUint: "(u)int",
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cborMajorNegInt: "int",
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cborMajorBytes: "bytes",
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cborMajorString: "string",
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cborMajorArray: "array",
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cborMajorMap: "map",
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cborMajorTag: "tag",
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cborMajorSimpleOrFloat: "simple",
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}
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)
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func cbordesc(bd byte) (s string) {
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bm := bd >> 5
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if bm == cborMajorSimpleOrFloat {
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s = cbordescSimpleNames[bd]
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} else {
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s = cbordescMajorNames[bm]
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if s == "" {
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s = cbordescIndefNames[bd]
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}
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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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// -------------------
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type cborEncDriver struct {
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noBuiltInTypes
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encDriverNoState
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encDriverNoopContainerWriter
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h *CborHandle
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// scratch buffer for: encode time, numbers, etc
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//
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// RFC3339Nano uses 35 chars: 2006-01-02T15:04:05.999999999Z07:00
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b [40]byte
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e Encoder
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}
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func (e *cborEncDriver) encoder() *Encoder {
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return &e.e
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}
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func (e *cborEncDriver) EncodeNil() {
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e.e.encWr.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.e.encWr.writen1(cborBdTrue)
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} else {
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e.e.encWr.writen1(cborBdFalse)
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}
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}
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func (e *cborEncDriver) EncodeFloat32(f float32) {
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b := math.Float32bits(f)
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if e.h.OptimumSize {
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if h := floatToHalfFloatBits(b); halfFloatToFloatBits(h) == b {
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e.e.encWr.writen1(cborBdFloat16)
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bigen.writeUint16(e.e.w(), h)
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return
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}
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}
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e.e.encWr.writen1(cborBdFloat32)
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bigen.writeUint32(e.e.w(), b)
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}
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func (e *cborEncDriver) EncodeFloat64(f float64) {
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if e.h.OptimumSize {
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if f32 := float32(f); float64(f32) == f {
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e.EncodeFloat32(f32)
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return
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}
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}
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e.e.encWr.writen1(cborBdFloat64)
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bigen.writeUint64(e.e.w(), 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.e.encWr.writen1(byte(v) + bd)
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} else if v <= math.MaxUint8 {
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e.e.encWr.writen2(bd+0x18, uint8(v))
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} else if v <= math.MaxUint16 {
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e.e.encWr.writen1(bd + 0x19)
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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 + 0x1a)
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bigen.writeUint32(e.e.w(), uint32(v))
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} else { // if v <= math.MaxUint64 {
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e.e.encWr.writen1(bd + 0x1b)
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bigen.writeUint64(e.e.w(), 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.encStringBytesS(cborBaseString, stringView(fmtTime(t, time.RFC3339Nano, e.b[:0])))
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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{}, basetype reflect.Type, xtag uint64, ext Ext) {
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e.encUint(uint64(xtag), cborBaseTag)
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if ext == SelfExt {
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e.e.encodeValue(baseRV(rv), e.h.fnNoExt(basetype))
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} else if v := ext.ConvertExt(rv); v == nil {
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e.EncodeNil()
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} else {
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e.e.encode(v)
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}
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}
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func (e *cborEncDriver) EncodeRawExt(re *RawExt) {
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e.encUint(uint64(re.Tag), cborBaseTag)
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// only encodes re.Value (never re.Data)
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if re.Value != nil {
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e.e.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.e.encWr.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.e.encWr.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.e.encWr.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.e.encWr.writen1(cborBdBreak)
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}
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}
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func (e *cborEncDriver) EncodeString(v string) {
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bb := cborBaseString
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if e.h.StringToRaw {
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bb = cborBaseBytes
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}
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e.encStringBytesS(bb, v)
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}
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func (e *cborEncDriver) EncodeStringBytesRaw(v []byte) {
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if v == nil {
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e.EncodeNil()
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} else {
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e.encStringBytesS(cborBaseBytes, 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.e.encWr.writen1(cborBdIndefiniteBytes)
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} else {
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e.e.encWr.writen1(cborBdIndefiniteString)
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}
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var vlen uint = uint(len(v))
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blen := vlen / 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 := uint(0); i < vlen; {
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var v2 string
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i2 := i + blen
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if i2 >= i && i2 < vlen {
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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.e.encWr.writestr(v2)
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i = i2
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}
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e.e.encWr.writen1(cborBdBreak)
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} else {
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e.encLen(bb, len(v))
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e.e.encWr.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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decDriverNoopContainerReader
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decDriverNoopNumberHelper
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h *CborHandle
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bdAndBdread
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st bool // skip tags
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_ bool // found nil
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noBuiltInTypes
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d Decoder
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}
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func (d *cborDecDriver) decoder() *Decoder {
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return &d.d
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}
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func (d *cborDecDriver) descBd() string {
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return sprintf("%v (%s)", d.bd, cbordesc(d.bd))
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}
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func (d *cborDecDriver) readNextBd() {
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d.bd = d.d.decRd.readn1()
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d.bdRead = true
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}
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func (d *cborDecDriver) 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 == cborBdNil || d.bd == cborBdUndefined {
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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 *cborDecDriver) TryNil() bool {
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return d.advanceNil()
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}
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// skipTags is called to skip any tags in the stream.
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//
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// Since any value can be tagged, then we should call skipTags
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// before any value is decoded.
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//
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// By definition, skipTags should not be called before
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// checking for break, or nil or undefined.
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func (d *cborDecDriver) skipTags() {
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for d.bd>>5 == cborMajorTag {
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d.decUint()
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d.bd = d.d.decRd.readn1()
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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.st {
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d.skipTags()
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}
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if d.bd == cborBdNil {
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d.bdRead = false // always consume nil after seeing it in container type
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return valueTypeNil
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}
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major := d.bd >> 5
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if major == cborMajorBytes {
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return valueTypeBytes
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} else if major == cborMajorString {
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return valueTypeString
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} else if major == cborMajorArray {
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return valueTypeArray
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} else if major == cborMajorMap {
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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 *cborDecDriver) CheckBreak() (v 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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v = true
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}
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return
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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 if v == 0x18 {
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ui = uint64(d.d.decRd.readn1())
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} else if v == 0x19 {
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ui = uint64(bigen.Uint16(d.d.decRd.readn2()))
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} else if v == 0x1a {
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ui = uint64(bigen.Uint32(d.d.decRd.readn4()))
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} else if v == 0x1b {
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ui = uint64(bigen.Uint64(d.d.decRd.readn8()))
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} else {
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d.d.errorf("invalid descriptor decoding uint: %x/%s", d.bd, cbordesc(d.bd))
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}
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return
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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, major byte) []byte {
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d.bdRead = false
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for !d.CheckBreak() {
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chunkMajor := d.bd >> 5
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if chunkMajor != major {
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d.d.errorf("malformed indefinite string/bytes %x (%s); contains chunk with major type %v, expected %v",
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d.bd, cbordesc(d.bd), chunkMajor, major)
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}
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n := uint(d.decLen())
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oldLen := uint(len(bs))
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newLen := oldLen + n
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if newLen > uint(cap(bs)) {
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bs2 := make([]byte, newLen, 2*uint(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.d.decRd.readb(bs[oldLen:newLen])
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if d.h.ValidateUnicode && major == cborMajorString && !utf8.Valid(bs[oldLen:newLen]) {
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d.d.errorf("indefinite-length text string contains chunk that is not a valid utf-8 sequence: 0x%x", bs[oldLen:newLen])
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}
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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) decFloat() (f float64, ok bool) {
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ok = true
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switch d.bd {
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case cborBdFloat16:
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f = float64(math.Float32frombits(halfFloatToFloatBits(bigen.Uint16(d.d.decRd.readn2()))))
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case cborBdFloat32:
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f = float64(math.Float32frombits(bigen.Uint32(d.d.decRd.readn4())))
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case cborBdFloat64:
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f = math.Float64frombits(bigen.Uint64(d.d.decRd.readn8()))
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default:
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ok = false
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}
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return
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}
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func (d *cborDecDriver) decInteger() (ui uint64, neg, ok bool) {
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ok = true
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switch d.bd >> 5 {
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case cborMajorUint:
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ui = d.decUint()
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case cborMajorNegInt:
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ui = d.decUint()
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neg = true
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default:
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ok = false
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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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if d.advanceNil() {
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return
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}
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if d.st {
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d.skipTags()
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}
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i = decNegintPosintFloatNumberHelper{&d.d}.int64(d.decInteger())
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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.advanceNil() {
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return
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}
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if d.st {
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d.skipTags()
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}
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ui = decNegintPosintFloatNumberHelper{&d.d}.uint64(d.decInteger())
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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.advanceNil() {
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return
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}
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if d.st {
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d.skipTags()
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}
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f = decNegintPosintFloatNumberHelper{&d.d}.float64(d.decFloat())
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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.advanceNil() {
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return
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}
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if d.st {
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|
d.skipTags()
|
|
}
|
|
if d.bd == cborBdTrue {
|
|
b = true
|
|
} else if d.bd == cborBdFalse {
|
|
} else {
|
|
d.d.errorf("not bool - %s %x/%s", msgBadDesc, d.bd, cbordesc(d.bd))
|
|
}
|
|
d.bdRead = false
|
|
return
|
|
}
|
|
|
|
func (d *cborDecDriver) ReadMapStart() (length int) {
|
|
if d.advanceNil() {
|
|
return containerLenNil
|
|
}
|
|
if d.st {
|
|
d.skipTags()
|
|
}
|
|
d.bdRead = false
|
|
if d.bd == cborBdIndefiniteMap {
|
|
return containerLenUnknown
|
|
}
|
|
if d.bd>>5 != cborMajorMap {
|
|
d.d.errorf("error reading map; got major type: %x, expected %x/%s", d.bd>>5, cborMajorMap, cbordesc(d.bd))
|
|
}
|
|
return d.decLen()
|
|
}
|
|
|
|
func (d *cborDecDriver) ReadArrayStart() (length int) {
|
|
if d.advanceNil() {
|
|
return containerLenNil
|
|
}
|
|
if d.st {
|
|
d.skipTags()
|
|
}
|
|
d.bdRead = false
|
|
if d.bd == cborBdIndefiniteArray {
|
|
return containerLenUnknown
|
|
}
|
|
if d.bd>>5 != cborMajorArray {
|
|
d.d.errorf("invalid array; got major type: %x, expect: %x/%s", d.bd>>5, cborMajorArray, cbordesc(d.bd))
|
|
}
|
|
return d.decLen()
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeBytes(bs []byte) (bsOut []byte) {
|
|
d.d.decByteState = decByteStateNone
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
if d.st {
|
|
d.skipTags()
|
|
}
|
|
if d.bd == cborBdIndefiniteBytes || d.bd == cborBdIndefiniteString {
|
|
d.bdRead = false
|
|
if bs == nil {
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
return d.decAppendIndefiniteBytes(d.d.b[:0], d.bd>>5)
|
|
}
|
|
return d.decAppendIndefiniteBytes(bs[:0], d.bd>>5)
|
|
}
|
|
if d.bd == cborBdIndefiniteArray {
|
|
d.bdRead = false
|
|
if bs == nil {
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
bs = d.d.b[:0]
|
|
} else {
|
|
bs = bs[:0]
|
|
}
|
|
for !d.CheckBreak() {
|
|
bs = append(bs, uint8(chkOvf.UintV(d.DecodeUint64(), 8)))
|
|
}
|
|
return bs
|
|
}
|
|
if d.bd>>5 == cborMajorArray {
|
|
d.bdRead = false
|
|
if bs == nil {
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
bs = d.d.b[:]
|
|
}
|
|
slen := d.decLen()
|
|
var changed bool
|
|
if bs, changed = usableByteSlice(bs, slen); changed {
|
|
d.d.decByteState = decByteStateNone
|
|
}
|
|
for i := 0; i < len(bs); 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
|
|
}
|
|
clen := d.decLen()
|
|
d.bdRead = false
|
|
if d.d.zerocopy() {
|
|
d.d.decByteState = decByteStateZerocopy
|
|
return d.d.decRd.rb.readx(uint(clen))
|
|
}
|
|
if bs == nil {
|
|
d.d.decByteState = decByteStateReuseBuf
|
|
bs = d.d.b[:]
|
|
}
|
|
return decByteSlice(d.d.r(), clen, d.h.MaxInitLen, bs)
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeStringAsBytes() (s []byte) {
|
|
s = d.DecodeBytes(nil)
|
|
if d.h.ValidateUnicode && !utf8.Valid(s) {
|
|
d.d.errorf("DecodeStringAsBytes: invalid UTF-8: %s", s)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeTime() (t time.Time) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
if d.bd>>5 != cborMajorTag {
|
|
d.d.errorf("error reading tag; expected major type: %x, got: %x", cborMajorTag, d.bd>>5)
|
|
}
|
|
xtag := d.decUint()
|
|
d.bdRead = false
|
|
return d.decodeTime(xtag)
|
|
}
|
|
|
|
func (d *cborDecDriver) decodeTime(xtag uint64) (t time.Time) {
|
|
switch xtag {
|
|
case 0:
|
|
var err error
|
|
t, err = time.Parse(time.RFC3339, stringView(d.DecodeStringAsBytes()))
|
|
d.d.onerror(err)
|
|
case 1:
|
|
f1, f2 := math.Modf(d.DecodeFloat64())
|
|
t = time.Unix(int64(f1), int64(f2*1e9))
|
|
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{}, basetype reflect.Type, xtag uint64, ext Ext) {
|
|
if d.advanceNil() {
|
|
return
|
|
}
|
|
if d.bd>>5 != cborMajorTag {
|
|
d.d.errorf("error reading tag; expected major type: %x, got: %x", cborMajorTag, d.bd>>5)
|
|
}
|
|
realxtag := d.decUint()
|
|
d.bdRead = false
|
|
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)
|
|
} else if ext == SelfExt {
|
|
d.d.decodeValue(baseRV(rv), d.h.fnNoExt(basetype))
|
|
} else {
|
|
d.d.interfaceExtConvertAndDecode(rv, ext)
|
|
}
|
|
d.bdRead = false
|
|
}
|
|
|
|
func (d *cborDecDriver) DecodeNaked() {
|
|
if !d.bdRead {
|
|
d.readNextBd()
|
|
}
|
|
|
|
n := d.d.naked()
|
|
var decodeFurther bool
|
|
|
|
switch d.bd >> 5 {
|
|
case cborMajorUint:
|
|
if d.h.SignedInteger {
|
|
n.v = valueTypeInt
|
|
n.i = d.DecodeInt64()
|
|
} else {
|
|
n.v = valueTypeUint
|
|
n.u = d.DecodeUint64()
|
|
}
|
|
case cborMajorNegInt:
|
|
n.v = valueTypeInt
|
|
n.i = d.DecodeInt64()
|
|
case cborMajorBytes:
|
|
d.d.fauxUnionReadRawBytes(false)
|
|
case cborMajorString:
|
|
n.v = valueTypeString
|
|
n.s = d.d.stringZC(d.DecodeStringAsBytes())
|
|
case cborMajorArray:
|
|
n.v = valueTypeArray
|
|
decodeFurther = true
|
|
case cborMajorMap:
|
|
n.v = valueTypeMap
|
|
decodeFurther = true
|
|
case cborMajorTag:
|
|
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)
|
|
} else if d.st && d.h.getExtForTag(n.u) == nil {
|
|
// d.skipTags() // no need to call this - tags already skipped
|
|
d.bdRead = false
|
|
d.DecodeNaked()
|
|
return // return when done (as true recursive function)
|
|
}
|
|
case cborMajorSimpleOrFloat:
|
|
switch d.bd {
|
|
case cborBdNil, cborBdUndefined:
|
|
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()
|
|
default:
|
|
d.d.errorf("decodeNaked: Unrecognized d.bd: 0x%x", d.bd)
|
|
}
|
|
default: // should never happen
|
|
d.d.errorf("decodeNaked: Unrecognized d.bd: 0x%x", d.bd)
|
|
}
|
|
if !decodeFurther {
|
|
d.bdRead = false
|
|
}
|
|
}
|
|
|
|
func (d *cborDecDriver) uintBytes() (v []byte, ui uint64) {
|
|
// this is only used by nextValueBytes, so it's ok to
|
|
// use readx and bigenstd here.
|
|
switch vv := d.bd & 0x1f; vv {
|
|
case 0x18:
|
|
v = d.d.decRd.readx(1)
|
|
ui = uint64(v[0])
|
|
case 0x19:
|
|
v = d.d.decRd.readx(2)
|
|
ui = uint64(bigenstd.Uint16(v))
|
|
case 0x1a:
|
|
v = d.d.decRd.readx(4)
|
|
ui = uint64(bigenstd.Uint32(v))
|
|
case 0x1b:
|
|
v = d.d.decRd.readx(8)
|
|
ui = uint64(bigenstd.Uint64(v))
|
|
default:
|
|
if vv > 0x1b {
|
|
d.d.errorf("invalid descriptor decoding uint: %x/%s", d.bd, cbordesc(d.bd))
|
|
}
|
|
ui = uint64(vv)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *cborDecDriver) 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 *cborDecDriver) 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 *cborDecDriver) nextValueBytesBdReadR(v0 []byte) (v []byte) {
|
|
v = v0
|
|
var h = decNextValueBytesHelper{d: &d.d}
|
|
|
|
var bs []byte
|
|
var ui uint64
|
|
|
|
switch d.bd >> 5 {
|
|
case cborMajorUint, cborMajorNegInt:
|
|
bs, _ = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
case cborMajorString, cborMajorBytes:
|
|
if d.bd == cborBdIndefiniteBytes || d.bd == cborBdIndefiniteString {
|
|
for {
|
|
d.readNextBd()
|
|
h.append1(&v, d.bd)
|
|
if d.bd == cborBdBreak {
|
|
break
|
|
}
|
|
bs, ui = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
h.appendN(&v, d.d.decRd.readx(uint(ui))...)
|
|
}
|
|
} else {
|
|
bs, ui = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
h.appendN(&v, d.d.decRd.readx(uint(ui))...)
|
|
}
|
|
case cborMajorArray:
|
|
if d.bd == cborBdIndefiniteArray {
|
|
for {
|
|
d.readNextBd()
|
|
h.append1(&v, d.bd)
|
|
if d.bd == cborBdBreak {
|
|
break
|
|
}
|
|
v = d.nextValueBytesBdReadR(v)
|
|
}
|
|
} else {
|
|
bs, ui = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
for i := uint64(0); i < ui; i++ {
|
|
v = d.nextValueBytesR(v)
|
|
}
|
|
}
|
|
case cborMajorMap:
|
|
if d.bd == cborBdIndefiniteMap {
|
|
for {
|
|
d.readNextBd()
|
|
h.append1(&v, d.bd)
|
|
if d.bd == cborBdBreak {
|
|
break
|
|
}
|
|
v = d.nextValueBytesBdReadR(v)
|
|
v = d.nextValueBytesR(v)
|
|
}
|
|
} else {
|
|
bs, ui = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
for i := uint64(0); i < ui; i++ {
|
|
v = d.nextValueBytesR(v)
|
|
v = d.nextValueBytesR(v)
|
|
}
|
|
}
|
|
case cborMajorTag:
|
|
bs, _ = d.uintBytes()
|
|
h.appendN(&v, bs...)
|
|
v = d.nextValueBytesR(v)
|
|
case cborMajorSimpleOrFloat:
|
|
switch d.bd {
|
|
case cborBdNil, cborBdUndefined, cborBdFalse, cborBdTrue: // pass
|
|
case cborBdFloat16:
|
|
h.appendN(&v, d.d.decRd.readx(2)...)
|
|
case cborBdFloat32:
|
|
h.appendN(&v, d.d.decRd.readx(4)...)
|
|
case cborBdFloat64:
|
|
h.appendN(&v, d.d.decRd.readx(8)...)
|
|
default:
|
|
d.d.errorf("nextValueBytes: Unrecognized d.bd: 0x%x", d.bd)
|
|
}
|
|
default: // should never happen
|
|
d.d.errorf("nextValueBytes: Unrecognized d.bd: 0x%x", d.bd)
|
|
}
|
|
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
|
|
|
|
// SkipUnexpectedTags says to skip over any tags for which extensions are
|
|
// not defined. This is in keeping with the cbor spec on "Optional Tagging of Items".
|
|
//
|
|
// Furthermore, this allows the skipping over of the Self Describing Tag 0xd9d9f7.
|
|
SkipUnexpectedTags bool
|
|
}
|
|
|
|
// Name returns the name of the handle: cbor
|
|
func (h *CborHandle) Name() string { return "cbor" }
|
|
|
|
func (h *CborHandle) desc(bd byte) string { return cbordesc(bd) }
|
|
|
|
func (h *CborHandle) newEncDriver() encDriver {
|
|
var e = &cborEncDriver{h: h}
|
|
e.e.e = e
|
|
e.e.init(h)
|
|
e.reset()
|
|
return e
|
|
}
|
|
|
|
func (h *CborHandle) newDecDriver() decDriver {
|
|
d := &cborDecDriver{h: h, st: h.SkipUnexpectedTags}
|
|
d.d.d = d
|
|
d.d.cbor = true
|
|
d.d.init(h)
|
|
d.reset()
|
|
return d
|
|
}
|
|
|
|
func (d *cborDecDriver) reset() {
|
|
d.bdAndBdread.reset()
|
|
d.st = d.h.SkipUnexpectedTags
|
|
}
|
|
|
|
var _ decDriver = (*cborDecDriver)(nil)
|
|
var _ encDriver = (*cborEncDriver)(nil)
|