mirror of https://github.com/goccy/go-json.git
Refactor buffering of encoder for improvement performance
This commit is contained in:
Masaaki Goshima
parent
920c79e0b7
commit
01b439e41e
158
encode.go
158
encode.go
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@ -100,7 +100,8 @@ func (e *Encoder) EncodeWithOption(v interface{}, opts ...EncodeOption) error {
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return err
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}
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}
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if err := e.encode(v); err != nil {
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var err error
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if e.buf, err = e.encode(v); err != nil {
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return err
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}
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if e.enabledIndent {
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@ -149,7 +150,8 @@ func (e *Encoder) reset() {
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}
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func (e *Encoder) encodeForMarshal(v interface{}) ([]byte, error) {
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if err := e.encode(v); err != nil {
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var err error
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if e.buf, err = e.encode(v); err != nil {
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return nil, err
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}
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if e.enabledIndent {
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@ -162,15 +164,16 @@ func (e *Encoder) encodeForMarshal(v interface{}) ([]byte, error) {
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return copied, nil
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}
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func (e *Encoder) encode(v interface{}) error {
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func (e *Encoder) encode(v interface{}) ([]byte, error) {
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b := e.buf
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if v == nil {
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e.encodeNull()
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b = encodeNull(b)
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if e.enabledIndent {
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e.encodeBytes([]byte{',', '\n'})
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b = encodeIndentComma(b)
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} else {
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e.encodeByte(',')
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b = encodeComma(b)
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}
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return nil
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return b, nil
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}
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header := (*interfaceHeader)(unsafe.Pointer(&v))
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typ := header.typ
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@ -187,9 +190,9 @@ func (e *Encoder) encode(v interface{}) error {
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ctx := codeSet.ctx.Get().(*encodeRuntimeContext)
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p := uintptr(header.ptr)
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ctx.init(p)
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err := e.run(ctx, code)
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b, err := e.run(ctx, b, code)
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codeSet.ctx.Put(ctx)
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return err
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return b, err
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}
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// noescape trick for header.typ ( reflect.*rtype )
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@ -201,7 +204,7 @@ func (e *Encoder) encode(v interface{}) error {
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withIndent: true,
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})
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if err != nil {
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return err
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return nil, err
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}
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code, err := e.compileHead(&encodeCompileContext{
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typ: copiedType,
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@ -209,7 +212,7 @@ func (e *Encoder) encode(v interface{}) error {
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withIndent: false,
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})
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if err != nil {
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return err
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return nil, err
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}
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codeIndent = copyOpcode(codeIndent)
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code = copyOpcode(code)
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@ -239,55 +242,56 @@ func (e *Encoder) encode(v interface{}) error {
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c = code
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}
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if err := e.run(ctx, c); err != nil {
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b, err = e.run(ctx, b, c)
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if err != nil {
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codeSet.ctx.Put(ctx)
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return err
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return nil, err
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}
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codeSet.ctx.Put(ctx)
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return nil
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return b, nil
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}
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func (e *Encoder) encodeInt(v int) {
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e.encodeInt64(int64(v))
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func encodeInt(b []byte, v int) []byte {
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return strconv.AppendInt(b, int64(v), 10)
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}
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func (e *Encoder) encodeInt8(v int8) {
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e.encodeInt64(int64(v))
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func encodeInt8(b []byte, v int8) []byte {
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return strconv.AppendInt(b, int64(v), 10)
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}
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func (e *Encoder) encodeInt16(v int16) {
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e.encodeInt64(int64(v))
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func encodeInt16(b []byte, v int16) []byte {
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return strconv.AppendInt(b, int64(v), 10)
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}
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func (e *Encoder) encodeInt32(v int32) {
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e.encodeInt64(int64(v))
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func encodeInt32(b []byte, v int32) []byte {
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return strconv.AppendInt(b, int64(v), 10)
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}
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func (e *Encoder) encodeInt64(v int64) {
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e.buf = strconv.AppendInt(e.buf, v, 10)
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func encodeInt64(b []byte, v int64) []byte {
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return strconv.AppendInt(b, v, 10)
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}
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func (e *Encoder) encodeUint(v uint) {
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e.encodeUint64(uint64(v))
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func encodeUint(b []byte, v uint) []byte {
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return strconv.AppendUint(b, uint64(v), 10)
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}
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func (e *Encoder) encodeUint8(v uint8) {
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e.encodeUint64(uint64(v))
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func encodeUint8(b []byte, v uint8) []byte {
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return strconv.AppendUint(b, uint64(v), 10)
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}
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func (e *Encoder) encodeUint16(v uint16) {
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e.encodeUint64(uint64(v))
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func encodeUint16(b []byte, v uint16) []byte {
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return strconv.AppendUint(b, uint64(v), 10)
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}
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func (e *Encoder) encodeUint32(v uint32) {
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e.encodeUint64(uint64(v))
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func encodeUint32(b []byte, v uint32) []byte {
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return strconv.AppendUint(b, uint64(v), 10)
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}
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func (e *Encoder) encodeUint64(v uint64) {
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e.buf = strconv.AppendUint(e.buf, v, 10)
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func encodeUint64(b []byte, v uint64) []byte {
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return strconv.AppendUint(b, v, 10)
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}
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func (e *Encoder) encodeFloat32(v float32) {
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func encodeFloat32(b []byte, v float32) []byte {
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f64 := float64(v)
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abs := math.Abs(f64)
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fmt := byte('f')
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@ -298,10 +302,10 @@ func (e *Encoder) encodeFloat32(v float32) {
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fmt = 'e'
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}
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}
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e.buf = strconv.AppendFloat(e.buf, f64, fmt, -1, 32)
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return strconv.AppendFloat(b, f64, fmt, -1, 32)
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}
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func (e *Encoder) encodeFloat64(v float64) {
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func encodeFloat64(b []byte, v float64) []byte {
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abs := math.Abs(v)
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fmt := byte('f')
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// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
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@ -310,58 +314,62 @@ func (e *Encoder) encodeFloat64(v float64) {
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fmt = 'e'
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}
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}
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e.buf = strconv.AppendFloat(e.buf, v, fmt, -1, 64)
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return strconv.AppendFloat(b, v, fmt, -1, 64)
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}
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func (e *Encoder) encodeBool(v bool) {
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e.buf = strconv.AppendBool(e.buf, v)
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}
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func (e *Encoder) encodeBytes(b []byte) {
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e.buf = append(e.buf, b...)
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}
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func (e *Encoder) encodeNull() {
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e.buf = append(e.buf, 'n', 'u', 'l', 'l')
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}
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func (e *Encoder) encodeKey(code *opcode) {
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if e.enabledHTMLEscape {
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e.encodeBytes(code.escapedKey)
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} else {
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e.encodeBytes(code.key)
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func encodeBool(b []byte, v bool) []byte {
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if v {
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return append(b, "true"...)
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}
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return append(b, "false"...)
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}
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func (e *Encoder) encodeString(s string) {
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func encodeBytes(dst []byte, src []byte) []byte {
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return append(dst, src...)
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}
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func encodeNull(b []byte) []byte {
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return append(b, "null"...)
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}
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func encodeComma(b []byte) []byte {
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return append(b, ',')
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}
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func encodeIndentComma(b []byte) []byte {
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return append(b, ',', '\n')
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}
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func (e *Encoder) encodeKey(b []byte, code *opcode) []byte {
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if e.enabledHTMLEscape {
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e.encodeEscapedString(s)
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} else {
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e.encodeNoEscapedString(s)
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return append(b, code.escapedKey...)
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}
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return append(b, code.key...)
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}
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func (e *Encoder) encodeByteSlice(b []byte) {
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encodedLen := base64.StdEncoding.EncodedLen(len(b))
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e.encodeByte('"')
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pos := len(e.buf)
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remainLen := cap(e.buf[pos:])
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func (e *Encoder) encodeString(b []byte, s string) []byte {
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if e.enabledHTMLEscape {
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return encodeEscapedString(b, s)
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}
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return encodeNoEscapedString(b, s)
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}
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func encodeByteSlice(b []byte, src []byte) []byte {
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encodedLen := base64.StdEncoding.EncodedLen(len(src))
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b = append(b, '"')
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pos := len(b)
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remainLen := cap(b[pos:])
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var buf []byte
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if remainLen > encodedLen {
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buf = e.buf[pos : pos+encodedLen]
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buf = b[pos : pos+encodedLen]
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} else {
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buf = make([]byte, encodedLen)
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}
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base64.StdEncoding.Encode(buf, b)
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e.encodeBytes(buf)
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e.encodeByte('"')
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base64.StdEncoding.Encode(buf, src)
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return append(append(b, buf...), '"')
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}
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func (e *Encoder) encodeByte(b byte) {
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e.buf = append(e.buf, b)
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}
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func (e *Encoder) encodeIndent(indent int) {
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e.buf = append(e.buf, e.prefix...)
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e.buf = append(e.buf, bytes.Repeat(e.indentStr, indent)...)
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func (e *Encoder) encodeIndent(b []byte, indent int) []byte {
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b = append(b, e.prefix...)
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return append(b, bytes.Repeat(e.indentStr, indent)...)
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}
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@ -1007,7 +1007,7 @@ func (e *Encoder) compileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode,
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var buf bytes.Buffer
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enc := NewEncoder(&buf)
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enc.encodeEscapedString(tag.key)
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enc.buf = encodeEscapedString(enc.buf, tag.key)
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escapedKey := fmt.Sprintf(`%s:`, string(enc.buf))
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enc.release()
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fieldCode := &opcode{
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750
encode_string.go
750
encode_string.go
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@ -1,9 +1,352 @@
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package json
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import (
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"math/bits"
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"reflect"
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"unicode/utf8"
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"unsafe"
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)
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const (
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lsb = 0x0101010101010101
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msb = 0x8080808080808080
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)
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var needEscapeWithHTML = [256]bool{
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'"': true,
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'&': true,
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'<': true,
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'>': true,
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'\\': true,
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0x00: true,
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0x01: true,
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0x02: true,
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0x03: true,
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0x04: true,
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0x05: true,
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0x06: true,
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0x07: true,
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0x08: true,
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0x09: true,
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0x0a: true,
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0x0b: true,
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0x0c: true,
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0x0d: true,
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0x0e: true,
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0x0f: true,
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0x10: true,
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0x11: true,
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0x12: true,
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0x13: true,
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0x14: true,
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0x15: true,
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0x16: true,
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0x17: true,
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0x18: true,
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0x19: true,
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0x1a: true,
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0x1b: true,
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0x1c: true,
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0x1d: true,
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0x1e: true,
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0x1f: true,
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/* 0x20 - 0x7f */
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0x80: true,
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0x81: true,
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0x82: true,
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0x83: true,
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0x84: true,
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0x85: true,
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0x86: true,
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0x87: true,
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0x88: true,
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0x89: true,
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0x8a: true,
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0x8b: true,
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0x8c: true,
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0x8d: true,
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0x8e: true,
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0x8f: true,
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0x90: true,
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0x91: true,
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0x92: true,
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0x93: true,
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0x94: true,
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0x95: true,
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0x96: true,
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0x97: true,
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0x98: true,
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0x99: true,
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0x9a: true,
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0x9b: true,
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0x9c: true,
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0x9d: true,
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0x9e: true,
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0x9f: true,
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0xa0: true,
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0xa1: true,
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0xa2: true,
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0xa3: true,
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0xa4: true,
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0xa5: true,
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0xa6: true,
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0xa7: true,
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0xa8: true,
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0xa9: true,
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0xaa: true,
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0xab: true,
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0xac: true,
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0xad: true,
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0xae: true,
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0xaf: true,
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0xb0: true,
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0xb1: true,
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0xb2: true,
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0xb3: true,
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0xb4: true,
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0xb5: true,
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0xb6: true,
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0xb7: true,
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0xb8: true,
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0xb9: true,
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0xba: true,
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0xbb: true,
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0xbc: true,
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0xbd: true,
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0xbe: true,
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0xbf: true,
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0xc0: true,
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0xc1: true,
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0xc2: true,
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0xc3: true,
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0xc4: true,
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0xc5: true,
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0xc6: true,
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0xc7: true,
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0xc8: true,
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0xc9: true,
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0xca: true,
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0xcb: true,
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0xcc: true,
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0xcd: true,
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0xce: true,
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0xcf: true,
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0xd0: true,
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0xd1: true,
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0xd2: true,
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0xd3: true,
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0xd4: true,
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0xd5: true,
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0xd6: true,
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0xd7: true,
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0xd8: true,
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0xd9: true,
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0xda: true,
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0xdb: true,
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0xdc: true,
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0xdd: true,
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0xde: true,
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0xdf: true,
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0xe0: true,
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0xe1: true,
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0xe2: true,
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0xe3: true,
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0xe4: true,
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0xe5: true,
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0xe6: true,
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0xe7: true,
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0xe8: true,
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0xe9: true,
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0xea: true,
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0xeb: true,
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0xec: true,
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0xed: true,
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0xee: true,
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0xef: true,
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0xf0: true,
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0xf1: true,
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0xf2: true,
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0xf3: true,
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0xf4: true,
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0xf5: true,
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0xf6: true,
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0xf7: true,
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0xf8: true,
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0xf9: true,
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0xfa: true,
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0xfb: true,
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0xfc: true,
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0xfd: true,
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0xfe: true,
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0xff: true,
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}
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var needEscape = [256]bool{
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'"': true,
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'\\': true,
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0x00: true,
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0x01: true,
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0x02: true,
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0x03: true,
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0x04: true,
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0x05: true,
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0x06: true,
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0x07: true,
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0x08: true,
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0x09: true,
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0x0a: true,
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0x0b: true,
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0x0c: true,
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0x0d: true,
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0x0e: true,
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0x0f: true,
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0x10: true,
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0x11: true,
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0x12: true,
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0x13: true,
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0x14: true,
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0x15: true,
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0x16: true,
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0x17: true,
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0x18: true,
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0x19: true,
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0x1a: true,
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0x1b: true,
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0x1c: true,
|
||||
0x1d: true,
|
||||
0x1e: true,
|
||||
0x1f: true,
|
||||
/* 0x20 - 0x7f */
|
||||
0x80: true,
|
||||
0x81: true,
|
||||
0x82: true,
|
||||
0x83: true,
|
||||
0x84: true,
|
||||
0x85: true,
|
||||
0x86: true,
|
||||
0x87: true,
|
||||
0x88: true,
|
||||
0x89: true,
|
||||
0x8a: true,
|
||||
0x8b: true,
|
||||
0x8c: true,
|
||||
0x8d: true,
|
||||
0x8e: true,
|
||||
0x8f: true,
|
||||
0x90: true,
|
||||
0x91: true,
|
||||
0x92: true,
|
||||
0x93: true,
|
||||
0x94: true,
|
||||
0x95: true,
|
||||
0x96: true,
|
||||
0x97: true,
|
||||
0x98: true,
|
||||
0x99: true,
|
||||
0x9a: true,
|
||||
0x9b: true,
|
||||
0x9c: true,
|
||||
0x9d: true,
|
||||
0x9e: true,
|
||||
0x9f: true,
|
||||
0xa0: true,
|
||||
0xa1: true,
|
||||
0xa2: true,
|
||||
0xa3: true,
|
||||
0xa4: true,
|
||||
0xa5: true,
|
||||
0xa6: true,
|
||||
0xa7: true,
|
||||
0xa8: true,
|
||||
0xa9: true,
|
||||
0xaa: true,
|
||||
0xab: true,
|
||||
0xac: true,
|
||||
0xad: true,
|
||||
0xae: true,
|
||||
0xaf: true,
|
||||
0xb0: true,
|
||||
0xb1: true,
|
||||
0xb2: true,
|
||||
0xb3: true,
|
||||
0xb4: true,
|
||||
0xb5: true,
|
||||
0xb6: true,
|
||||
0xb7: true,
|
||||
0xb8: true,
|
||||
0xb9: true,
|
||||
0xba: true,
|
||||
0xbb: true,
|
||||
0xbc: true,
|
||||
0xbd: true,
|
||||
0xbe: true,
|
||||
0xbf: true,
|
||||
0xc0: true,
|
||||
0xc1: true,
|
||||
0xc2: true,
|
||||
0xc3: true,
|
||||
0xc4: true,
|
||||
0xc5: true,
|
||||
0xc6: true,
|
||||
0xc7: true,
|
||||
0xc8: true,
|
||||
0xc9: true,
|
||||
0xca: true,
|
||||
0xcb: true,
|
||||
0xcc: true,
|
||||
0xcd: true,
|
||||
0xce: true,
|
||||
0xcf: true,
|
||||
0xd0: true,
|
||||
0xd1: true,
|
||||
0xd2: true,
|
||||
0xd3: true,
|
||||
0xd4: true,
|
||||
0xd5: true,
|
||||
0xd6: true,
|
||||
0xd7: true,
|
||||
0xd8: true,
|
||||
0xd9: true,
|
||||
0xda: true,
|
||||
0xdb: true,
|
||||
0xdc: true,
|
||||
0xdd: true,
|
||||
0xde: true,
|
||||
0xdf: true,
|
||||
0xe0: true,
|
||||
0xe1: true,
|
||||
0xe2: true,
|
||||
0xe3: true,
|
||||
0xe4: true,
|
||||
0xe5: true,
|
||||
0xe6: true,
|
||||
0xe7: true,
|
||||
0xe8: true,
|
||||
0xe9: true,
|
||||
0xea: true,
|
||||
0xeb: true,
|
||||
0xec: true,
|
||||
0xed: true,
|
||||
0xee: true,
|
||||
0xef: true,
|
||||
0xf0: true,
|
||||
0xf1: true,
|
||||
0xf2: true,
|
||||
0xf3: true,
|
||||
0xf4: true,
|
||||
0xf5: true,
|
||||
0xf6: true,
|
||||
0xf7: true,
|
||||
0xf8: true,
|
||||
0xf9: true,
|
||||
0xfa: true,
|
||||
0xfb: true,
|
||||
0xfc: true,
|
||||
0xfd: true,
|
||||
0xfe: true,
|
||||
0xff: true,
|
||||
}
|
||||
|
||||
// htmlSafeSet holds the value true if the ASCII character with the given
|
||||
// array position can be safely represented inside a JSON string, embedded
|
||||
// inside of HTML <script> tags, without any additional escaping.
|
||||
|
|
@ -345,154 +688,293 @@ var safeSet = [utf8.RuneSelf]bool{
|
|||
|
||||
var hex = "0123456789abcdef"
|
||||
|
||||
func (e *Encoder) encodeEscapedString(s string) {
|
||||
// escapeIndex finds the index of the first char in `s` that requires escaping.
|
||||
// A char requires escaping if it's outside of the range of [0x20, 0x7F] or if
|
||||
// it includes a double quote or backslash.
|
||||
// If no chars in `s` require escaping, the return value is -1.
|
||||
func escapeIndex(s string) int {
|
||||
chunks := stringToUint64Slice(s)
|
||||
for _, n := range chunks {
|
||||
// combine masks before checking for the MSB of each byte. We include
|
||||
// `n` in the mask to check whether any of the *input* byte MSBs were
|
||||
// set (i.e. the byte was outside the ASCII range).
|
||||
mask := n | below(n, 0x20) | contains(n, '"') | contains(n, '\\')
|
||||
if (mask & msb) != 0 {
|
||||
return bits.TrailingZeros64(mask&msb) / 8
|
||||
}
|
||||
}
|
||||
|
||||
valLen := len(s)
|
||||
// write string, the fast path, without utf8 and escape support
|
||||
i := 0
|
||||
for ; i < valLen; i++ {
|
||||
if !htmlSafeSet[s[i]] {
|
||||
break
|
||||
for i := len(chunks) * 8; i < valLen; i++ {
|
||||
if needEscape[s[i]] {
|
||||
return i
|
||||
}
|
||||
}
|
||||
e.buf = append(e.buf, '"')
|
||||
if i == valLen {
|
||||
e.buf = append(e.buf, s...)
|
||||
e.buf = append(e.buf, '"')
|
||||
return
|
||||
}
|
||||
e.buf = append(e.buf, s[:i]...)
|
||||
e.writeStringSlowPathWithHTMLEscaped(i, s, valLen)
|
||||
|
||||
return -1
|
||||
}
|
||||
|
||||
func (e *Encoder) writeStringSlowPathWithHTMLEscaped(i int, s string, valLen int) {
|
||||
start := i
|
||||
// for the remaining parts, we process them char by char
|
||||
for i < valLen {
|
||||
if b := s[i]; b < utf8.RuneSelf {
|
||||
if htmlSafeSet[b] {
|
||||
i++
|
||||
continue
|
||||
}
|
||||
if start < i {
|
||||
e.buf = append(e.buf, s[start:i]...)
|
||||
}
|
||||
switch b {
|
||||
case '\\', '"':
|
||||
e.buf = append(e.buf, '\\', b)
|
||||
case '\n':
|
||||
e.buf = append(e.buf, '\\', 'n')
|
||||
case '\r':
|
||||
e.buf = append(e.buf, '\\', 'r')
|
||||
case '\t':
|
||||
e.buf = append(e.buf, '\\', 't')
|
||||
default:
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
// If escapeHTML is set, it also escapes <, >, and &
|
||||
// because they can lead to security holes when
|
||||
// user-controlled strings are rendered into JSON
|
||||
// and served to some browsers.
|
||||
e.buf = append(e.buf, `\u00`...)
|
||||
e.buf = append(e.buf, hex[b>>4], hex[b&0xF])
|
||||
}
|
||||
i++
|
||||
start = i
|
||||
continue
|
||||
// escapeIndex finds the index of the first char in `s` that requires escaping.
|
||||
// A char requires escaping if it's outside of the range of [0x20, 0x7F] or if
|
||||
// it includes a double quote or backslash.
|
||||
// Also, the chars <, > and & require escaping.
|
||||
// If no chars in `s` require escaping, the return value is -1.
|
||||
func escapeIndexWithHTMLEscape(s string) int {
|
||||
chunks := stringToUint64Slice(s)
|
||||
for _, n := range chunks {
|
||||
// combine masks before checking for the MSB of each byte. We include
|
||||
// `n` in the mask to check whether any of the *input* byte MSBs were
|
||||
// set (i.e. the byte was outside the ASCII range).
|
||||
mask := n | below(n, 0x20) | contains(n, '"') | contains(n, '\\') | contains(n, '<') | contains(n, '>') | contains(n, '&')
|
||||
if (mask & msb) != 0 {
|
||||
return bits.TrailingZeros64(mask&msb) / 8
|
||||
}
|
||||
c, size := utf8.DecodeRuneInString(s[i:])
|
||||
if c == utf8.RuneError && size == 1 {
|
||||
if start < i {
|
||||
e.buf = append(e.buf, s[start:i]...)
|
||||
}
|
||||
e.buf = append(e.buf, `\ufffd`...)
|
||||
i++
|
||||
start = i
|
||||
continue
|
||||
}
|
||||
// U+2028 is LINE SEPARATOR.
|
||||
// U+2029 is PARAGRAPH SEPARATOR.
|
||||
// They are both technically valid characters in JSON strings,
|
||||
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
||||
// and can lead to security holes there. It is valid JSON to
|
||||
// escape them, so we do so unconditionally.
|
||||
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
||||
if c == '\u2028' || c == '\u2029' {
|
||||
if start < i {
|
||||
e.buf = append(e.buf, s[start:i]...)
|
||||
}
|
||||
e.buf = append(e.buf, `\u202`...)
|
||||
e.buf = append(e.buf, hex[c&0xF])
|
||||
i += size
|
||||
start = i
|
||||
continue
|
||||
}
|
||||
i += size
|
||||
}
|
||||
if start < len(s) {
|
||||
e.buf = append(e.buf, s[start:]...)
|
||||
}
|
||||
e.buf = append(e.buf, '"')
|
||||
}
|
||||
|
||||
func (e *Encoder) encodeNoEscapedString(s string) {
|
||||
valLen := len(s)
|
||||
|
||||
// write string, the fast path, without utf8 and escape support
|
||||
i := 0
|
||||
for ; i < valLen; i++ {
|
||||
c := s[i]
|
||||
if c <= 31 || c == '"' || c == '\\' {
|
||||
break
|
||||
for i := len(chunks) * 8; i < valLen; i++ {
|
||||
if needEscapeWithHTML[s[i]] {
|
||||
return i
|
||||
}
|
||||
}
|
||||
e.buf = append(e.buf, '"')
|
||||
if i == valLen {
|
||||
e.buf = append(e.buf, s...)
|
||||
e.buf = append(e.buf, '"')
|
||||
return
|
||||
}
|
||||
e.buf = append(e.buf, s[:i]...)
|
||||
e.writeStringSlowPath(i, s, valLen)
|
||||
|
||||
return -1
|
||||
}
|
||||
|
||||
func (e *Encoder) writeStringSlowPath(i int, s string, valLen int) {
|
||||
start := i
|
||||
// for the remaining parts, we process them char by char
|
||||
for i < valLen {
|
||||
if b := s[i]; b < utf8.RuneSelf {
|
||||
if safeSet[b] {
|
||||
i++
|
||||
continue
|
||||
}
|
||||
if start < i {
|
||||
e.buf = append(e.buf, s[start:i]...)
|
||||
}
|
||||
switch b {
|
||||
case '\\', '"':
|
||||
e.buf = append(e.buf, '\\', b)
|
||||
case '\n':
|
||||
e.buf = append(e.buf, '\\', 'n')
|
||||
case '\r':
|
||||
e.buf = append(e.buf, '\\', 'r')
|
||||
case '\t':
|
||||
e.buf = append(e.buf, '\\', 't')
|
||||
default:
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
// If escapeHTML is set, it also escapes <, >, and &
|
||||
// because they can lead to security holes when
|
||||
// user-controlled strings are rendered into JSON
|
||||
// and served to some browsers.
|
||||
e.buf = append(e.buf, []byte(`\u00`)...)
|
||||
e.buf = append(e.buf, hex[b>>4], hex[b&0xF])
|
||||
}
|
||||
i++
|
||||
start = i
|
||||
// below return a mask that can be used to determine if any of the bytes
|
||||
// in `n` are below `b`. If a byte's MSB is set in the mask then that byte was
|
||||
// below `b`. The result is only valid if `b`, and each byte in `n`, is below
|
||||
// 0x80.
|
||||
func below(n uint64, b byte) uint64 {
|
||||
return n - expand(b)
|
||||
}
|
||||
|
||||
// contains returns a mask that can be used to determine if any of the
|
||||
// bytes in `n` are equal to `b`. If a byte's MSB is set in the mask then
|
||||
// that byte is equal to `b`. The result is only valid if `b`, and each
|
||||
// byte in `n`, is below 0x80.
|
||||
func contains(n uint64, b byte) uint64 {
|
||||
return (n ^ expand(b)) - lsb
|
||||
}
|
||||
|
||||
// expand puts the specified byte into each of the 8 bytes of a uint64.
|
||||
func expand(b byte) uint64 {
|
||||
return lsb * uint64(b)
|
||||
}
|
||||
|
||||
func stringToUint64Slice(s string) []uint64 {
|
||||
return *(*[]uint64)(unsafe.Pointer(&reflect.SliceHeader{
|
||||
Data: ((*reflect.StringHeader)(unsafe.Pointer(&s))).Data,
|
||||
Len: len(s) / 8,
|
||||
Cap: len(s) / 8,
|
||||
}))
|
||||
}
|
||||
|
||||
func encodeEscapedString(buf []byte, s string) []byte {
|
||||
valLen := len(s)
|
||||
if valLen == 0 {
|
||||
return append(buf, `""`...)
|
||||
}
|
||||
buf = append(buf, '"')
|
||||
var escapeIdx int
|
||||
if valLen >= 8 {
|
||||
if escapeIdx = escapeIndexWithHTMLEscape(s); escapeIdx < 0 {
|
||||
return append(append(buf, s...), '"')
|
||||
}
|
||||
}
|
||||
i := 0
|
||||
j := escapeIdx
|
||||
for j < valLen {
|
||||
c := s[j]
|
||||
|
||||
if c >= 0x20 && c <= 0x7f && c != '\\' && c != '"' && (c != '<' && c != '>' && c != '&') {
|
||||
// fast path: most of the time, printable ascii characters are used
|
||||
j++
|
||||
continue
|
||||
}
|
||||
i++
|
||||
continue
|
||||
|
||||
switch c {
|
||||
case '\\', '"':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', c)
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\n':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'n')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\r':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'r')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\t':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 't')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '<', '>', '&':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
if c < 0x20 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
r, size := utf8.DecodeRuneInString(s[j:])
|
||||
|
||||
if r == utf8.RuneError && size == 1 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\ufffd`...)
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
switch r {
|
||||
case '\u2028', '\u2029':
|
||||
// U+2028 is LINE SEPARATOR.
|
||||
// U+2029 is PARAGRAPH SEPARATOR.
|
||||
// They are both technically valid characters in JSON strings,
|
||||
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
||||
// and can lead to security holes there. It is valid JSON to
|
||||
// escape them, so we do so unconditionally.
|
||||
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u202`...)
|
||||
buf = append(buf, hex[r&0xF])
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
j += size
|
||||
}
|
||||
if start < len(s) {
|
||||
e.buf = append(e.buf, s[start:]...)
|
||||
}
|
||||
e.buf = append(e.buf, '"')
|
||||
|
||||
return append(append(buf, s[i:]...), '"')
|
||||
}
|
||||
|
||||
func encodeNoEscapedString(buf []byte, s string) []byte {
|
||||
valLen := len(s)
|
||||
if valLen == 0 {
|
||||
return append(buf, `""`...)
|
||||
}
|
||||
buf = append(buf, '"')
|
||||
var escapeIdx int
|
||||
if valLen >= 8 {
|
||||
if escapeIdx = escapeIndex(s); escapeIdx < 0 {
|
||||
return append(append(buf, s...), '"')
|
||||
}
|
||||
}
|
||||
|
||||
i := 0
|
||||
j := escapeIdx
|
||||
for j < valLen {
|
||||
c := s[j]
|
||||
|
||||
if c >= 0x20 && c <= 0x7f && c != '\\' && c != '"' {
|
||||
// fast path: most of the time, printable ascii characters are used
|
||||
j++
|
||||
continue
|
||||
}
|
||||
|
||||
switch c {
|
||||
case '\\', '"':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', c)
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\n':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'n')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\r':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'r')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\t':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 't')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '<', '>', '&':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
if c < 0x20 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
r, size := utf8.DecodeRuneInString(s[j:])
|
||||
|
||||
if r == utf8.RuneError && size == 1 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\ufffd`...)
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
switch r {
|
||||
case '\u2028', '\u2029':
|
||||
// U+2028 is LINE SEPARATOR.
|
||||
// U+2029 is PARAGRAPH SEPARATOR.
|
||||
// They are both technically valid characters in JSON strings,
|
||||
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
||||
// and can lead to security holes there. It is valid JSON to
|
||||
// escape them, so we do so unconditionally.
|
||||
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u202`...)
|
||||
buf = append(buf, hex[r&0xF])
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
j += size
|
||||
}
|
||||
|
||||
return append(append(buf, s[i:]...), '"')
|
||||
}
|
||||
|
|
|
|||
3686
encode_vm.go
3686
encode_vm.go
File diff suppressed because it is too large
Load Diff
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Reference in New Issue