forked from gitea/gitea
520 lines
13 KiB
Go
520 lines
13 KiB
Go
// Copyright (c) 2012-2015 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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)
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const (
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_ uint8 = iota
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simpleVdNil = 1
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simpleVdFalse = 2
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simpleVdTrue = 3
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simpleVdFloat32 = 4
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simpleVdFloat64 = 5
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// each lasts for 4 (ie n, n+1, n+2, n+3)
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simpleVdPosInt = 8
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simpleVdNegInt = 12
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// containers: each lasts for 4 (ie n, n+1, n+2, ... n+7)
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simpleVdString = 216
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simpleVdByteArray = 224
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simpleVdArray = 232
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simpleVdMap = 240
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simpleVdExt = 248
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)
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type simpleEncDriver struct {
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noBuiltInTypes
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encNoSeparator
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e *Encoder
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h *SimpleHandle
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w encWriter
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b [8]byte
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}
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func (e *simpleEncDriver) EncodeNil() {
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e.w.writen1(simpleVdNil)
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}
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func (e *simpleEncDriver) EncodeBool(b bool) {
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if b {
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e.w.writen1(simpleVdTrue)
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} else {
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e.w.writen1(simpleVdFalse)
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}
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}
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func (e *simpleEncDriver) EncodeFloat32(f float32) {
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e.w.writen1(simpleVdFloat32)
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bigenHelper{e.b[:4], e.w}.writeUint32(math.Float32bits(f))
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}
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func (e *simpleEncDriver) EncodeFloat64(f float64) {
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e.w.writen1(simpleVdFloat64)
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bigenHelper{e.b[:8], e.w}.writeUint64(math.Float64bits(f))
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}
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func (e *simpleEncDriver) EncodeInt(v int64) {
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if v < 0 {
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e.encUint(uint64(-v), simpleVdNegInt)
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} else {
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e.encUint(uint64(v), simpleVdPosInt)
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}
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}
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func (e *simpleEncDriver) EncodeUint(v uint64) {
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e.encUint(v, simpleVdPosInt)
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}
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func (e *simpleEncDriver) encUint(v uint64, bd uint8) {
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if v <= math.MaxUint8 {
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e.w.writen2(bd, uint8(v))
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} else if v <= math.MaxUint16 {
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e.w.writen1(bd + 1)
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bigenHelper{e.b[:2], e.w}.writeUint16(uint16(v))
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} else if v <= math.MaxUint32 {
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e.w.writen1(bd + 2)
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bigenHelper{e.b[:4], e.w}.writeUint32(uint32(v))
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} else { // if v <= math.MaxUint64 {
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e.w.writen1(bd + 3)
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bigenHelper{e.b[:8], e.w}.writeUint64(v)
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}
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}
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func (e *simpleEncDriver) encLen(bd byte, length int) {
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if length == 0 {
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e.w.writen1(bd)
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} else if length <= math.MaxUint8 {
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e.w.writen1(bd + 1)
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e.w.writen1(uint8(length))
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} else if length <= math.MaxUint16 {
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e.w.writen1(bd + 2)
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bigenHelper{e.b[:2], e.w}.writeUint16(uint16(length))
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} else if int64(length) <= math.MaxUint32 {
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e.w.writen1(bd + 3)
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bigenHelper{e.b[:4], e.w}.writeUint32(uint32(length))
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} else {
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e.w.writen1(bd + 4)
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bigenHelper{e.b[:8], e.w}.writeUint64(uint64(length))
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}
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}
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func (e *simpleEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, _ *Encoder) {
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bs := ext.WriteExt(rv)
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if bs == nil {
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e.EncodeNil()
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return
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}
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e.encodeExtPreamble(uint8(xtag), len(bs))
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e.w.writeb(bs)
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}
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func (e *simpleEncDriver) EncodeRawExt(re *RawExt, _ *Encoder) {
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e.encodeExtPreamble(uint8(re.Tag), len(re.Data))
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e.w.writeb(re.Data)
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}
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func (e *simpleEncDriver) encodeExtPreamble(xtag byte, length int) {
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e.encLen(simpleVdExt, length)
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e.w.writen1(xtag)
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}
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func (e *simpleEncDriver) EncodeArrayStart(length int) {
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e.encLen(simpleVdArray, length)
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}
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func (e *simpleEncDriver) EncodeMapStart(length int) {
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e.encLen(simpleVdMap, length)
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}
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func (e *simpleEncDriver) EncodeString(c charEncoding, v string) {
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e.encLen(simpleVdString, len(v))
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e.w.writestr(v)
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}
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func (e *simpleEncDriver) EncodeSymbol(v string) {
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e.EncodeString(c_UTF8, v)
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}
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func (e *simpleEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
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e.encLen(simpleVdByteArray, len(v))
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e.w.writeb(v)
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}
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//------------------------------------
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type simpleDecDriver struct {
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d *Decoder
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h *SimpleHandle
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r decReader
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bdRead bool
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bd byte
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br bool // bytes reader
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noBuiltInTypes
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noStreamingCodec
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decNoSeparator
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b [scratchByteArrayLen]byte
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}
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func (d *simpleDecDriver) 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 *simpleDecDriver) ContainerType() (vt valueType) {
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if d.bd == simpleVdNil {
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return valueTypeNil
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} else if d.bd == simpleVdByteArray || d.bd == simpleVdByteArray+1 ||
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d.bd == simpleVdByteArray+2 || d.bd == simpleVdByteArray+3 || d.bd == simpleVdByteArray+4 {
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return valueTypeBytes
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} else if d.bd == simpleVdString || d.bd == simpleVdString+1 ||
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d.bd == simpleVdString+2 || d.bd == simpleVdString+3 || d.bd == simpleVdString+4 {
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return valueTypeString
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} else if d.bd == simpleVdArray || d.bd == simpleVdArray+1 ||
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d.bd == simpleVdArray+2 || d.bd == simpleVdArray+3 || d.bd == simpleVdArray+4 {
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return valueTypeArray
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} else if d.bd == simpleVdMap || d.bd == simpleVdMap+1 ||
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d.bd == simpleVdMap+2 || d.bd == simpleVdMap+3 || d.bd == simpleVdMap+4 {
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return valueTypeMap
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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 *simpleDecDriver) TryDecodeAsNil() 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 == simpleVdNil {
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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 *simpleDecDriver) decCheckInteger() (ui uint64, neg bool) {
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if !d.bdRead {
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d.readNextBd()
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}
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switch d.bd {
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case simpleVdPosInt:
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ui = uint64(d.r.readn1())
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case simpleVdPosInt + 1:
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ui = uint64(bigen.Uint16(d.r.readx(2)))
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case simpleVdPosInt + 2:
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ui = uint64(bigen.Uint32(d.r.readx(4)))
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case simpleVdPosInt + 3:
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ui = uint64(bigen.Uint64(d.r.readx(8)))
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case simpleVdNegInt:
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ui = uint64(d.r.readn1())
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neg = true
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case simpleVdNegInt + 1:
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ui = uint64(bigen.Uint16(d.r.readx(2)))
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neg = true
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case simpleVdNegInt + 2:
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ui = uint64(bigen.Uint32(d.r.readx(4)))
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neg = true
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case simpleVdNegInt + 3:
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ui = uint64(bigen.Uint64(d.r.readx(8)))
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neg = true
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default:
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d.d.errorf("decIntAny: Integer only valid from pos/neg integer1..8. Invalid descriptor: %v", d.bd)
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return
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}
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// don't do this check, because callers may only want the unsigned value.
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// if ui > math.MaxInt64 {
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// d.d.errorf("decIntAny: Integer out of range for signed int64: %v", ui)
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// return
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// }
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return
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}
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func (d *simpleDecDriver) DecodeInt(bitsize uint8) (i int64) {
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ui, neg := d.decCheckInteger()
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i, overflow := chkOvf.SignedInt(ui)
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if overflow {
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d.d.errorf("simple: overflow converting %v to signed integer", ui)
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return
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}
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if neg {
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i = -i
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}
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if chkOvf.Int(i, bitsize) {
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d.d.errorf("simple: overflow integer: %v", i)
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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 *simpleDecDriver) DecodeUint(bitsize uint8) (ui uint64) {
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ui, neg := d.decCheckInteger()
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if neg {
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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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if chkOvf.Uint(ui, bitsize) {
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d.d.errorf("simple: overflow integer: %v", ui)
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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 *simpleDecDriver) DecodeFloat(chkOverflow32 bool) (f float64) {
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if !d.bdRead {
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d.readNextBd()
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}
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if d.bd == simpleVdFloat32 {
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f = float64(math.Float32frombits(bigen.Uint32(d.r.readx(4))))
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} else if d.bd == simpleVdFloat64 {
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f = math.Float64frombits(bigen.Uint64(d.r.readx(8)))
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} else {
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if d.bd >= simpleVdPosInt && d.bd <= simpleVdNegInt+3 {
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f = float64(d.DecodeInt(64))
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} else {
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d.d.errorf("Float only valid from float32/64: Invalid descriptor: %v", d.bd)
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return
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}
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}
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if chkOverflow32 && chkOvf.Float32(f) {
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d.d.errorf("msgpack: float32 overflow: %v", f)
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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 *simpleDecDriver) 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 d.bd == simpleVdTrue {
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b = true
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} else if d.bd == simpleVdFalse {
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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 *simpleDecDriver) ReadMapStart() (length int) {
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d.bdRead = false
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return d.decLen()
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}
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func (d *simpleDecDriver) ReadArrayStart() (length int) {
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d.bdRead = false
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return d.decLen()
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}
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func (d *simpleDecDriver) decLen() int {
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switch d.bd % 8 {
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case 0:
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return 0
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case 1:
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return int(d.r.readn1())
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case 2:
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return int(bigen.Uint16(d.r.readx(2)))
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case 3:
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ui := uint64(bigen.Uint32(d.r.readx(4)))
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if chkOvf.Uint(ui, intBitsize) {
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d.d.errorf("simple: overflow integer: %v", ui)
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return 0
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}
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return int(ui)
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case 4:
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ui := bigen.Uint64(d.r.readx(8))
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if chkOvf.Uint(ui, intBitsize) {
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d.d.errorf("simple: overflow integer: %v", ui)
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return 0
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}
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return int(ui)
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}
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d.d.errorf("decLen: Cannot read length: bd%8 must be in range 0..4. Got: %d", d.bd%8)
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return -1
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}
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func (d *simpleDecDriver) DecodeString() (s string) {
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return string(d.DecodeBytes(d.b[:], true, true))
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}
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func (d *simpleDecDriver) DecodeBytes(bs []byte, isstring, 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 == simpleVdNil {
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d.bdRead = false
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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.b[:]
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}
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}
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return decByteSlice(d.r, clen, bs)
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}
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func (d *simpleDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
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if xtag > 0xff {
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d.d.errorf("decodeExt: tag must be <= 0xff; got: %v", xtag)
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return
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}
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realxtag1, xbs := d.decodeExtV(ext != nil, uint8(xtag))
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realxtag = uint64(realxtag1)
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if ext == nil {
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re := rv.(*RawExt)
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re.Tag = realxtag
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re.Data = detachZeroCopyBytes(d.br, re.Data, xbs)
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} else {
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ext.ReadExt(rv, xbs)
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}
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return
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}
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func (d *simpleDecDriver) decodeExtV(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
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if !d.bdRead {
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d.readNextBd()
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}
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switch d.bd {
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case simpleVdExt, simpleVdExt + 1, simpleVdExt + 2, simpleVdExt + 3, simpleVdExt + 4:
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l := d.decLen()
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xtag = d.r.readn1()
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if verifyTag && xtag != tag {
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d.d.errorf("Wrong extension tag. Got %b. Expecting: %v", xtag, tag)
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return
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}
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xbs = d.r.readx(l)
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case simpleVdByteArray, simpleVdByteArray + 1, simpleVdByteArray + 2, simpleVdByteArray + 3, simpleVdByteArray + 4:
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xbs = d.DecodeBytes(nil, false, true)
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default:
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d.d.errorf("Invalid d.bd for extensions (Expecting extensions or byte array). Got: 0x%x", 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 *simpleDecDriver) DecodeNaked() {
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if !d.bdRead {
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d.readNextBd()
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}
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n := &d.d.n
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var decodeFurther bool
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switch d.bd {
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case simpleVdNil:
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n.v = valueTypeNil
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case simpleVdFalse:
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n.v = valueTypeBool
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n.b = false
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case simpleVdTrue:
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n.v = valueTypeBool
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n.b = true
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case simpleVdPosInt, simpleVdPosInt + 1, simpleVdPosInt + 2, simpleVdPosInt + 3:
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if d.h.SignedInteger {
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n.v = valueTypeInt
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n.i = d.DecodeInt(64)
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} else {
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n.v = valueTypeUint
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n.u = d.DecodeUint(64)
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}
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case simpleVdNegInt, simpleVdNegInt + 1, simpleVdNegInt + 2, simpleVdNegInt + 3:
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n.v = valueTypeInt
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n.i = d.DecodeInt(64)
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case simpleVdFloat32:
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n.v = valueTypeFloat
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n.f = d.DecodeFloat(true)
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case simpleVdFloat64:
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n.v = valueTypeFloat
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n.f = d.DecodeFloat(false)
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case simpleVdString, simpleVdString + 1, simpleVdString + 2, simpleVdString + 3, simpleVdString + 4:
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n.v = valueTypeString
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n.s = d.DecodeString()
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case simpleVdByteArray, simpleVdByteArray + 1, simpleVdByteArray + 2, simpleVdByteArray + 3, simpleVdByteArray + 4:
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n.v = valueTypeBytes
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n.l = d.DecodeBytes(nil, false, false)
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case simpleVdExt, simpleVdExt + 1, simpleVdExt + 2, simpleVdExt + 3, simpleVdExt + 4:
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n.v = valueTypeExt
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l := d.decLen()
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n.u = uint64(d.r.readn1())
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n.l = d.r.readx(l)
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case simpleVdArray, simpleVdArray + 1, simpleVdArray + 2, simpleVdArray + 3, simpleVdArray + 4:
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n.v = valueTypeArray
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decodeFurther = true
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case simpleVdMap, simpleVdMap + 1, simpleVdMap + 2, simpleVdMap + 3, simpleVdMap + 4:
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n.v = valueTypeMap
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decodeFurther = true
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default:
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d.d.errorf("decodeNaked: Unrecognized d.bd: 0x%x", d.bd)
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}
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if !decodeFurther {
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d.bdRead = false
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}
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return
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}
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//------------------------------------
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// SimpleHandle is a Handle for a very simple encoding format.
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//
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// simple is a simplistic codec similar to binc, but not as compact.
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// - Encoding of a value is always preceeded by the descriptor byte (bd)
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// - True, false, nil are encoded fully in 1 byte (the descriptor)
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// - Integers (intXXX, uintXXX) are encoded in 1, 2, 4 or 8 bytes (plus a descriptor byte).
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// There are positive (uintXXX and intXXX >= 0) and negative (intXXX < 0) integers.
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// - Floats are encoded in 4 or 8 bytes (plus a descriptor byte)
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// - Lenght of containers (strings, bytes, array, map, extensions)
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// are encoded in 0, 1, 2, 4 or 8 bytes.
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// Zero-length containers have no length encoded.
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// For others, the number of bytes is given by pow(2, bd%3)
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// - maps are encoded as [bd] [length] [[key][value]]...
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// - arrays are encoded as [bd] [length] [value]...
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// - extensions are encoded as [bd] [length] [tag] [byte]...
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// - strings/bytearrays are encoded as [bd] [length] [byte]...
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//
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// The full spec will be published soon.
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type SimpleHandle struct {
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BasicHandle
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binaryEncodingType
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}
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func (h *SimpleHandle) SetBytesExt(rt reflect.Type, tag uint64, ext BytesExt) (err error) {
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return h.SetExt(rt, tag, &setExtWrapper{b: ext})
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}
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func (h *SimpleHandle) newEncDriver(e *Encoder) encDriver {
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return &simpleEncDriver{e: e, w: e.w, h: h}
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}
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func (h *SimpleHandle) newDecDriver(d *Decoder) decDriver {
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return &simpleDecDriver{d: d, r: d.r, h: h, br: d.bytes}
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}
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func (e *simpleEncDriver) reset() {
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e.w = e.e.w
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}
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func (d *simpleDecDriver) reset() {
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d.r = d.d.r
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d.bd, d.bdRead = 0, false
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}
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var _ decDriver = (*simpleDecDriver)(nil)
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var _ encDriver = (*simpleEncDriver)(nil)
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