537 lines
11 KiB
Go
537 lines
11 KiB
Go
package msgpack
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"reflect"
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"time"
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"github.com/vmihailenco/msgpack/codes"
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)
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const bytesAllocLimit = 1024 * 1024 // 1mb
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type bufReader interface {
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io.Reader
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io.ByteScanner
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}
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func newBufReader(r io.Reader) bufReader {
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if br, ok := r.(bufReader); ok {
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return br
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}
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return bufio.NewReader(r)
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}
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func makeBuffer() []byte {
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return make([]byte, 0, 64)
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}
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// Unmarshal decodes the MessagePack-encoded data and stores the result
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// in the value pointed to by v.
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func Unmarshal(data []byte, v ...interface{}) error {
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return NewDecoder(bytes.NewReader(data)).Decode(v...)
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}
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type Decoder struct {
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r io.Reader
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s io.ByteScanner
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buf []byte
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extLen int
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rec []byte // accumulates read data if not nil
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useLoose bool
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useJSONTag bool
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decodeMapFunc func(*Decoder) (interface{}, error)
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}
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// NewDecoder returns a new decoder that reads from r.
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//
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// The decoder introduces its own buffering and may read data from r
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// beyond the MessagePack values requested. Buffering can be disabled
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// by passing a reader that implements io.ByteScanner interface.
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func NewDecoder(r io.Reader) *Decoder {
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d := &Decoder{
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decodeMapFunc: decodeMap,
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buf: makeBuffer(),
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}
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d.resetReader(r)
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return d
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}
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func (d *Decoder) SetDecodeMapFunc(fn func(*Decoder) (interface{}, error)) {
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d.decodeMapFunc = fn
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}
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// UseDecodeInterfaceLoose causes decoder to use DecodeInterfaceLoose
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// to decode msgpack value into Go interface{}.
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func (d *Decoder) UseDecodeInterfaceLoose(flag bool) {
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d.useLoose = flag
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}
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// UseJSONTag causes the Decoder to use json struct tag as fallback option
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// if there is no msgpack tag.
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func (d *Decoder) UseJSONTag(v bool) *Decoder {
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d.useJSONTag = v
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return d
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}
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func (d *Decoder) Reset(r io.Reader) error {
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d.resetReader(r)
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return nil
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}
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func (d *Decoder) resetReader(r io.Reader) {
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reader := newBufReader(r)
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d.r = reader
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d.s = reader
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}
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func (d *Decoder) Decode(v ...interface{}) error {
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for _, vv := range v {
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if err := d.decode(vv); err != nil {
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return err
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}
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}
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return nil
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}
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func (d *Decoder) decode(dst interface{}) error {
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var err error
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switch v := dst.(type) {
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case *string:
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if v != nil {
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*v, err = d.DecodeString()
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return err
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}
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case *[]byte:
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if v != nil {
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return d.decodeBytesPtr(v)
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}
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case *int:
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if v != nil {
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*v, err = d.DecodeInt()
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return err
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}
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case *int8:
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if v != nil {
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*v, err = d.DecodeInt8()
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return err
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}
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case *int16:
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if v != nil {
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*v, err = d.DecodeInt16()
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return err
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}
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case *int32:
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if v != nil {
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*v, err = d.DecodeInt32()
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return err
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}
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case *int64:
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if v != nil {
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*v, err = d.DecodeInt64()
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return err
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}
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case *uint:
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if v != nil {
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*v, err = d.DecodeUint()
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return err
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}
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case *uint8:
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if v != nil {
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*v, err = d.DecodeUint8()
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return err
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}
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case *uint16:
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if v != nil {
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*v, err = d.DecodeUint16()
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return err
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}
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case *uint32:
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if v != nil {
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*v, err = d.DecodeUint32()
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return err
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}
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case *uint64:
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if v != nil {
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*v, err = d.DecodeUint64()
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return err
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}
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case *bool:
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if v != nil {
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*v, err = d.DecodeBool()
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return err
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}
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case *float32:
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if v != nil {
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*v, err = d.DecodeFloat32()
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return err
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}
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case *float64:
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if v != nil {
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*v, err = d.DecodeFloat64()
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return err
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}
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case *[]string:
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return d.decodeStringSlicePtr(v)
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case *map[string]string:
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return d.decodeMapStringStringPtr(v)
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case *map[string]interface{}:
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return d.decodeMapStringInterfacePtr(v)
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case *time.Duration:
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if v != nil {
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vv, err := d.DecodeInt64()
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*v = time.Duration(vv)
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return err
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}
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case *time.Time:
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if v != nil {
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*v, err = d.DecodeTime()
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return err
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}
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}
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v := reflect.ValueOf(dst)
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if !v.IsValid() {
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return errors.New("msgpack: Decode(nil)")
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}
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if v.Kind() != reflect.Ptr {
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return fmt.Errorf("msgpack: Decode(nonsettable %T)", dst)
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}
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v = v.Elem()
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if !v.IsValid() {
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return fmt.Errorf("msgpack: Decode(nonsettable %T)", dst)
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}
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return d.DecodeValue(v)
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}
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func (d *Decoder) decodeInterface() (interface{}, error) {
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if d.useLoose {
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return d.DecodeInterfaceLoose()
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}
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return d.DecodeInterface()
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}
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func (d *Decoder) DecodeValue(v reflect.Value) error {
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decode := getDecoder(v.Type())
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return decode(d, v)
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}
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func (d *Decoder) DecodeNil() error {
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c, err := d.readCode()
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if err != nil {
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return err
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}
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if c != codes.Nil {
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return fmt.Errorf("msgpack: invalid code=%x decoding nil", c)
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}
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return nil
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}
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func (d *Decoder) decodeNilValue(v reflect.Value) error {
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err := d.DecodeNil()
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if v.IsNil() {
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return err
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}
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if v.Kind() == reflect.Ptr {
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v = v.Elem()
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}
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v.Set(reflect.Zero(v.Type()))
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return err
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}
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func (d *Decoder) DecodeBool() (bool, error) {
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c, err := d.readCode()
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if err != nil {
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return false, err
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}
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return d.bool(c)
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}
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func (d *Decoder) bool(c codes.Code) (bool, error) {
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if c == codes.False {
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return false, nil
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}
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if c == codes.True {
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return true, nil
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}
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return false, fmt.Errorf("msgpack: invalid code=%x decoding bool", c)
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}
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// DecodeInterface decodes value into interface. It returns following types:
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// - nil,
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// - bool,
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// - int8, int16, int32, int64,
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// - uint8, uint16, uint32, uint64,
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// - float32 and float64,
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// - string,
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// - []byte,
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// - slices of any of the above,
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// - maps of any of the above.
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//
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// DecodeInterface should be used only when you don't know the type of value
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// you are decoding. For example, if you are decoding number it is better to use
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// DecodeInt64 for negative numbers and DecodeUint64 for positive numbers.
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func (d *Decoder) DecodeInterface() (interface{}, error) {
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c, err := d.readCode()
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if err != nil {
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return nil, err
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}
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if codes.IsFixedNum(c) {
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return int8(c), nil
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}
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if codes.IsFixedMap(c) {
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_ = d.s.UnreadByte()
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return d.DecodeMap()
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}
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if codes.IsFixedArray(c) {
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return d.decodeSlice(c)
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}
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if codes.IsFixedString(c) {
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return d.string(c)
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}
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switch c {
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case codes.Nil:
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return nil, nil
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case codes.False, codes.True:
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return d.bool(c)
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case codes.Float:
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return d.float32(c)
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case codes.Double:
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return d.float64(c)
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case codes.Uint8:
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return d.uint8()
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case codes.Uint16:
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return d.uint16()
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case codes.Uint32:
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return d.uint32()
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case codes.Uint64:
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return d.uint64()
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case codes.Int8:
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return d.int8()
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case codes.Int16:
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return d.int16()
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case codes.Int32:
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return d.int32()
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case codes.Int64:
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return d.int64()
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case codes.Bin8, codes.Bin16, codes.Bin32:
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return d.bytes(c, nil)
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case codes.Str8, codes.Str16, codes.Str32:
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return d.string(c)
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case codes.Array16, codes.Array32:
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return d.decodeSlice(c)
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case codes.Map16, codes.Map32:
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d.s.UnreadByte()
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return d.DecodeMap()
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case codes.FixExt1, codes.FixExt2, codes.FixExt4, codes.FixExt8, codes.FixExt16,
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codes.Ext8, codes.Ext16, codes.Ext32:
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return d.extInterface(c)
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}
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return 0, fmt.Errorf("msgpack: unknown code %x decoding interface{}", c)
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}
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// DecodeInterfaceLoose is like DecodeInterface except that:
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// - int8, int16, and int32 are converted to int64,
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// - uint8, uint16, and uint32 are converted to uint64,
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// - float32 is converted to float64.
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func (d *Decoder) DecodeInterfaceLoose() (interface{}, error) {
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c, err := d.readCode()
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if err != nil {
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return nil, err
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}
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if codes.IsFixedNum(c) {
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return int64(c), nil
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}
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if codes.IsFixedMap(c) {
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d.s.UnreadByte()
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return d.DecodeMap()
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}
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if codes.IsFixedArray(c) {
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return d.decodeSlice(c)
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}
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if codes.IsFixedString(c) {
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return d.string(c)
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}
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switch c {
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case codes.Nil:
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return nil, nil
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case codes.False, codes.True:
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return d.bool(c)
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case codes.Float, codes.Double:
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return d.float64(c)
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case codes.Uint8, codes.Uint16, codes.Uint32, codes.Uint64:
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return d.uint(c)
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case codes.Int8, codes.Int16, codes.Int32, codes.Int64:
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return d.int(c)
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case codes.Bin8, codes.Bin16, codes.Bin32:
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return d.bytes(c, nil)
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case codes.Str8, codes.Str16, codes.Str32:
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return d.string(c)
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case codes.Array16, codes.Array32:
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return d.decodeSlice(c)
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case codes.Map16, codes.Map32:
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d.s.UnreadByte()
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return d.DecodeMap()
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case codes.FixExt1, codes.FixExt2, codes.FixExt4, codes.FixExt8, codes.FixExt16,
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codes.Ext8, codes.Ext16, codes.Ext32:
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return d.extInterface(c)
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}
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return 0, fmt.Errorf("msgpack: unknown code %x decoding interface{}", c)
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}
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// Skip skips next value.
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func (d *Decoder) Skip() error {
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c, err := d.readCode()
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if err != nil {
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return err
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}
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if codes.IsFixedNum(c) {
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return nil
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} else if codes.IsFixedMap(c) {
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return d.skipMap(c)
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} else if codes.IsFixedArray(c) {
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return d.skipSlice(c)
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} else if codes.IsFixedString(c) {
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return d.skipBytes(c)
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}
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switch c {
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case codes.Nil, codes.False, codes.True:
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return nil
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case codes.Uint8, codes.Int8:
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return d.skipN(1)
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case codes.Uint16, codes.Int16:
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return d.skipN(2)
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case codes.Uint32, codes.Int32, codes.Float:
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return d.skipN(4)
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case codes.Uint64, codes.Int64, codes.Double:
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return d.skipN(8)
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case codes.Bin8, codes.Bin16, codes.Bin32:
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return d.skipBytes(c)
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case codes.Str8, codes.Str16, codes.Str32:
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return d.skipBytes(c)
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case codes.Array16, codes.Array32:
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return d.skipSlice(c)
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case codes.Map16, codes.Map32:
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return d.skipMap(c)
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case codes.FixExt1, codes.FixExt2, codes.FixExt4, codes.FixExt8, codes.FixExt16,
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codes.Ext8, codes.Ext16, codes.Ext32:
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return d.skipExt(c)
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}
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return fmt.Errorf("msgpack: unknown code %x", c)
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}
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// PeekCode returns the next MessagePack code without advancing the reader.
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// Subpackage msgpack/codes contains list of available codes.
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func (d *Decoder) PeekCode() (codes.Code, error) {
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c, err := d.s.ReadByte()
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if err != nil {
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return 0, err
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}
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return codes.Code(c), d.s.UnreadByte()
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}
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func (d *Decoder) hasNilCode() bool {
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code, err := d.PeekCode()
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return err == nil && code == codes.Nil
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}
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func (d *Decoder) readCode() (codes.Code, error) {
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d.extLen = 0
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c, err := d.s.ReadByte()
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if err != nil {
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return 0, err
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}
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if d.rec != nil {
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d.rec = append(d.rec, c)
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}
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return codes.Code(c), nil
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}
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func (d *Decoder) readFull(b []byte) error {
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_, err := io.ReadFull(d.r, b)
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if err != nil {
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return err
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}
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if d.rec != nil {
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d.rec = append(d.rec, b...)
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}
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return nil
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}
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func (d *Decoder) readN(n int) ([]byte, error) {
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buf, err := readN(d.r, d.buf, n)
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if err != nil {
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return nil, err
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}
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d.buf = buf
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if d.rec != nil {
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d.rec = append(d.rec, buf...)
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}
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return buf, nil
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}
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func readN(r io.Reader, b []byte, n int) ([]byte, error) {
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if b == nil {
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if n == 0 {
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return make([]byte, 0), nil
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}
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if n <= bytesAllocLimit {
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b = make([]byte, n)
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} else {
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b = make([]byte, bytesAllocLimit)
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}
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}
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if n <= cap(b) {
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b = b[:n]
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_, err := io.ReadFull(r, b)
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return b, err
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}
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b = b[:cap(b)]
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var pos int
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for {
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alloc := n - len(b)
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if alloc > bytesAllocLimit {
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alloc = bytesAllocLimit
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}
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b = append(b, make([]byte, alloc)...)
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_, err := io.ReadFull(r, b[pos:])
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if err != nil {
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return nil, err
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}
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if len(b) == n {
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break
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}
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pos = len(b)
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}
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return b, nil
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}
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func min(a, b int) int {
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if a <= b {
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return a
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}
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return b
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}
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