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1364 lines
26 KiB
1364 lines
26 KiB
package msgp
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import (
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"io"
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"math"
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"sync"
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"time"
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"github.com/philhofer/fwd"
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)
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// where we keep old *Readers
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var readerPool = sync.Pool{New: func() interface{} { return &Reader{} }}
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// Type is a MessagePack wire type,
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// including this package's built-in
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// extension types.
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type Type byte
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// MessagePack Types
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//
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// The zero value of Type
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// is InvalidType.
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const (
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InvalidType Type = iota
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// MessagePack built-in types
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StrType
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BinType
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MapType
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ArrayType
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Float64Type
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Float32Type
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BoolType
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IntType
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UintType
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NilType
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ExtensionType
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// pseudo-types provided
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// by extensions
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Complex64Type
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Complex128Type
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TimeType
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_maxtype
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)
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// String implements fmt.Stringer
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func (t Type) String() string {
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switch t {
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case StrType:
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return "str"
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case BinType:
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return "bin"
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case MapType:
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return "map"
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case ArrayType:
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return "array"
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case Float64Type:
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return "float64"
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case Float32Type:
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return "float32"
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case BoolType:
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return "bool"
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case UintType:
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return "uint"
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case IntType:
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return "int"
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case ExtensionType:
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return "ext"
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case NilType:
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return "nil"
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default:
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return "<invalid>"
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}
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}
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func freeR(m *Reader) {
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readerPool.Put(m)
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}
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// Unmarshaler is the interface fulfilled
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// by objects that know how to unmarshal
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// themselves from MessagePack.
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// UnmarshalMsg unmarshals the object
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// from binary, returing any leftover
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// bytes and any errors encountered.
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type Unmarshaler interface {
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UnmarshalMsg([]byte) ([]byte, error)
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}
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// Decodable is the interface fulfilled
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// by objects that know how to read
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// themselves from a *Reader.
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type Decodable interface {
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DecodeMsg(*Reader) error
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}
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// Decode decodes 'd' from 'r'.
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func Decode(r io.Reader, d Decodable) error {
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rd := NewReader(r)
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err := d.DecodeMsg(rd)
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freeR(rd)
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return err
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}
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// NewReader returns a *Reader that
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// reads from the provided reader. The
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// reader will be buffered.
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func NewReader(r io.Reader) *Reader {
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p := readerPool.Get().(*Reader)
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if p.R == nil {
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p.R = fwd.NewReader(r)
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} else {
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p.R.Reset(r)
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}
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return p
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}
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// NewReaderSize returns a *Reader with a buffer of the given size.
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// (This is vastly preferable to passing the decoder a reader that is already buffered.)
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func NewReaderSize(r io.Reader, sz int) *Reader {
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return &Reader{R: fwd.NewReaderSize(r, sz)}
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}
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// NewReaderBuf returns a *Reader with a provided buffer.
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func NewReaderBuf(r io.Reader, buf []byte) *Reader {
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return &Reader{R: fwd.NewReaderBuf(r, buf)}
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}
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// Reader wraps an io.Reader and provides
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// methods to read MessagePack-encoded values
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// from it. Readers are buffered.
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type Reader struct {
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// R is the buffered reader
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// that the Reader uses
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// to decode MessagePack.
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// The Reader itself
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// is stateless; all the
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// buffering is done
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// within R.
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R *fwd.Reader
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scratch []byte
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}
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// Read implements `io.Reader`
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func (m *Reader) Read(p []byte) (int, error) {
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return m.R.Read(p)
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}
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// CopyNext reads the next object from m without decoding it and writes it to w.
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// It avoids unnecessary copies internally.
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func (m *Reader) CopyNext(w io.Writer) (int64, error) {
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sz, o, err := getNextSize(m.R)
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if err != nil {
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return 0, err
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}
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var n int64
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// Opportunistic optimization: if we can fit the whole thing in the m.R
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// buffer, then just get a pointer to that, and pass it to w.Write,
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// avoiding an allocation.
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if int(sz) <= m.R.BufferSize() {
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var nn int
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var buf []byte
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buf, err = m.R.Next(int(sz))
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if err != nil {
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if err == io.ErrUnexpectedEOF {
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err = ErrShortBytes
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}
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return 0, err
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}
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nn, err = w.Write(buf)
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n += int64(nn)
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} else {
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// Fall back to io.CopyN.
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// May avoid allocating if w is a ReaderFrom (e.g. bytes.Buffer)
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n, err = io.CopyN(w, m.R, int64(sz))
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if err == io.ErrUnexpectedEOF {
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err = ErrShortBytes
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}
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}
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if err != nil {
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return n, err
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} else if n < int64(sz) {
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return n, io.ErrShortWrite
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}
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// for maps and slices, read elements
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for x := uintptr(0); x < o; x++ {
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var n2 int64
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n2, err = m.CopyNext(w)
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if err != nil {
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return n, err
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}
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n += n2
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}
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return n, nil
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}
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// ReadFull implements `io.ReadFull`
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func (m *Reader) ReadFull(p []byte) (int, error) {
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return m.R.ReadFull(p)
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}
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// Reset resets the underlying reader.
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func (m *Reader) Reset(r io.Reader) { m.R.Reset(r) }
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// Buffered returns the number of bytes currently in the read buffer.
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func (m *Reader) Buffered() int { return m.R.Buffered() }
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// BufferSize returns the capacity of the read buffer.
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func (m *Reader) BufferSize() int { return m.R.BufferSize() }
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// NextType returns the next object type to be decoded.
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func (m *Reader) NextType() (Type, error) {
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p, err := m.R.Peek(1)
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if err != nil {
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return InvalidType, err
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}
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t := getType(p[0])
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if t == InvalidType {
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return t, InvalidPrefixError(p[0])
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}
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if t == ExtensionType {
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v, err := m.peekExtensionType()
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if err != nil {
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return InvalidType, err
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}
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switch v {
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case Complex64Extension:
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return Complex64Type, nil
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case Complex128Extension:
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return Complex128Type, nil
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case TimeExtension:
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return TimeType, nil
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}
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}
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return t, nil
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}
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// IsNil returns whether or not
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// the next byte is a null messagepack byte
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func (m *Reader) IsNil() bool {
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p, err := m.R.Peek(1)
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return err == nil && p[0] == mnil
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}
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// getNextSize returns the size of the next object on the wire.
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// returns (obj size, obj elements, error)
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// only maps and arrays have non-zero obj elements
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// for maps and arrays, obj size does not include elements
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//
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// use uintptr b/c it's guaranteed to be large enough
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// to hold whatever we can fit in memory.
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func getNextSize(r *fwd.Reader) (uintptr, uintptr, error) {
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b, err := r.Peek(1)
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if err != nil {
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return 0, 0, err
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}
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lead := b[0]
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spec := &sizes[lead]
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size, mode := spec.size, spec.extra
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if size == 0 {
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return 0, 0, InvalidPrefixError(lead)
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}
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if mode >= 0 {
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return uintptr(size), uintptr(mode), nil
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}
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b, err = r.Peek(int(size))
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if err != nil {
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return 0, 0, err
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}
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switch mode {
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case extra8:
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return uintptr(size) + uintptr(b[1]), 0, nil
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case extra16:
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return uintptr(size) + uintptr(big.Uint16(b[1:])), 0, nil
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case extra32:
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return uintptr(size) + uintptr(big.Uint32(b[1:])), 0, nil
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case map16v:
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return uintptr(size), 2 * uintptr(big.Uint16(b[1:])), nil
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case map32v:
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return uintptr(size), 2 * uintptr(big.Uint32(b[1:])), nil
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case array16v:
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return uintptr(size), uintptr(big.Uint16(b[1:])), nil
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case array32v:
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return uintptr(size), uintptr(big.Uint32(b[1:])), nil
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default:
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return 0, 0, fatal
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}
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}
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// Skip skips over the next object, regardless of
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// its type. If it is an array or map, the whole array
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// or map will be skipped.
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func (m *Reader) Skip() error {
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var (
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v uintptr // bytes
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o uintptr // objects
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err error
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p []byte
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)
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// we can use the faster
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// method if we have enough
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// buffered data
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if m.R.Buffered() >= 5 {
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p, err = m.R.Peek(5)
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if err != nil {
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return err
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}
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v, o, err = getSize(p)
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if err != nil {
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return err
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}
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} else {
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v, o, err = getNextSize(m.R)
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if err != nil {
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return err
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}
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}
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// 'v' is always non-zero
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// if err == nil
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_, err = m.R.Skip(int(v))
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if err != nil {
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return err
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}
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// for maps and slices, skip elements
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for x := uintptr(0); x < o; x++ {
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err = m.Skip()
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if 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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// ReadMapHeader reads the next object
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// as a map header and returns the size
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// of the map and the number of bytes written.
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// It will return a TypeError{} if the next
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// object is not a map.
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func (m *Reader) ReadMapHeader() (sz uint32, err error) {
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var p []byte
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var lead byte
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p, err = m.R.Peek(1)
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if err != nil {
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return
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}
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lead = p[0]
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if isfixmap(lead) {
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sz = uint32(rfixmap(lead))
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_, err = m.R.Skip(1)
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return
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}
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switch lead {
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case mmap16:
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p, err = m.R.Next(3)
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if err != nil {
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return
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}
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sz = uint32(big.Uint16(p[1:]))
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return
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case mmap32:
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p, err = m.R.Next(5)
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if err != nil {
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return
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}
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sz = big.Uint32(p[1:])
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return
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default:
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err = badPrefix(MapType, lead)
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return
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}
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}
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// ReadMapKey reads either a 'str' or 'bin' field from
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// the reader and returns the value as a []byte. It uses
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// scratch for storage if it is large enough.
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func (m *Reader) ReadMapKey(scratch []byte) ([]byte, error) {
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out, err := m.ReadStringAsBytes(scratch)
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if err != nil {
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if tperr, ok := err.(TypeError); ok && tperr.Encoded == BinType {
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return m.ReadBytes(scratch)
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}
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return nil, err
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}
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return out, nil
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}
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|
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// MapKeyPtr returns a []byte pointing to the contents
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// of a valid map key. The key cannot be empty, and it
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// must be shorter than the total buffer size of the
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// *Reader. Additionally, the returned slice is only
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// valid until the next *Reader method call. Users
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// should exercise extreme care when using this
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// method; writing into the returned slice may
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// corrupt future reads.
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func (m *Reader) ReadMapKeyPtr() ([]byte, error) {
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p, err := m.R.Peek(1)
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if err != nil {
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return nil, err
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}
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lead := p[0]
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var read int
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if isfixstr(lead) {
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read = int(rfixstr(lead))
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m.R.Skip(1)
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goto fill
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}
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switch lead {
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case mstr8, mbin8:
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p, err = m.R.Next(2)
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if err != nil {
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return nil, err
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}
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read = int(p[1])
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case mstr16, mbin16:
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p, err = m.R.Next(3)
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if err != nil {
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return nil, err
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}
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read = int(big.Uint16(p[1:]))
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case mstr32, mbin32:
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p, err = m.R.Next(5)
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if err != nil {
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return nil, err
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}
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read = int(big.Uint32(p[1:]))
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default:
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return nil, badPrefix(StrType, lead)
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}
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fill:
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if read == 0 {
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return nil, ErrShortBytes
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}
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return m.R.Next(read)
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}
|
|
|
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// ReadArrayHeader reads the next object as an
|
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// array header and returns the size of the array
|
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// and the number of bytes read.
|
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func (m *Reader) ReadArrayHeader() (sz uint32, err error) {
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var lead byte
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var p []byte
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p, err = m.R.Peek(1)
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if err != nil {
|
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return
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}
|
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lead = p[0]
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if isfixarray(lead) {
|
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sz = uint32(rfixarray(lead))
|
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_, err = m.R.Skip(1)
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return
|
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}
|
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switch lead {
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case marray16:
|
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p, err = m.R.Next(3)
|
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if err != nil {
|
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return
|
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}
|
|
sz = uint32(big.Uint16(p[1:]))
|
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return
|
|
|
|
case marray32:
|
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p, err = m.R.Next(5)
|
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if err != nil {
|
|
return
|
|
}
|
|
sz = big.Uint32(p[1:])
|
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return
|
|
|
|
default:
|
|
err = badPrefix(ArrayType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadNil reads a 'nil' MessagePack byte from the reader
|
|
func (m *Reader) ReadNil() error {
|
|
p, err := m.R.Peek(1)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if p[0] != mnil {
|
|
return badPrefix(NilType, p[0])
|
|
}
|
|
_, err = m.R.Skip(1)
|
|
return err
|
|
}
|
|
|
|
// ReadFloat64 reads a float64 from the reader.
|
|
// (If the value on the wire is encoded as a float32,
|
|
// it will be up-cast to a float64.)
|
|
func (m *Reader) ReadFloat64() (f float64, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(9)
|
|
if err != nil {
|
|
// we'll allow a coversion from float32 to float64,
|
|
// since we don't lose any precision
|
|
if err == io.EOF && len(p) > 0 && p[0] == mfloat32 {
|
|
ef, err := m.ReadFloat32()
|
|
return float64(ef), err
|
|
}
|
|
return
|
|
}
|
|
if p[0] != mfloat64 {
|
|
// see above
|
|
if p[0] == mfloat32 {
|
|
ef, err := m.ReadFloat32()
|
|
return float64(ef), err
|
|
}
|
|
err = badPrefix(Float64Type, p[0])
|
|
return
|
|
}
|
|
f = math.Float64frombits(getMuint64(p))
|
|
_, err = m.R.Skip(9)
|
|
return
|
|
}
|
|
|
|
// ReadFloat32 reads a float32 from the reader
|
|
func (m *Reader) ReadFloat32() (f float32, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if p[0] != mfloat32 {
|
|
err = badPrefix(Float32Type, p[0])
|
|
return
|
|
}
|
|
f = math.Float32frombits(getMuint32(p))
|
|
_, err = m.R.Skip(5)
|
|
return
|
|
}
|
|
|
|
// ReadBool reads a bool from the reader
|
|
func (m *Reader) ReadBool() (b bool, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
switch p[0] {
|
|
case mtrue:
|
|
b = true
|
|
case mfalse:
|
|
default:
|
|
err = badPrefix(BoolType, p[0])
|
|
return
|
|
}
|
|
_, err = m.R.Skip(1)
|
|
return
|
|
}
|
|
|
|
// ReadInt64 reads an int64 from the reader
|
|
func (m *Reader) ReadInt64() (i int64, err error) {
|
|
var p []byte
|
|
var lead byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead = p[0]
|
|
|
|
if isfixint(lead) {
|
|
i = int64(rfixint(lead))
|
|
_, err = m.R.Skip(1)
|
|
return
|
|
} else if isnfixint(lead) {
|
|
i = int64(rnfixint(lead))
|
|
_, err = m.R.Skip(1)
|
|
return
|
|
}
|
|
|
|
switch lead {
|
|
case mint8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMint8(p))
|
|
return
|
|
|
|
case muint8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMuint8(p))
|
|
return
|
|
|
|
case mint16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMint16(p))
|
|
return
|
|
|
|
case muint16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMuint16(p))
|
|
return
|
|
|
|
case mint32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMint32(p))
|
|
return
|
|
|
|
case muint32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = int64(getMuint32(p))
|
|
return
|
|
|
|
case mint64:
|
|
p, err = m.R.Next(9)
|
|
if err != nil {
|
|
return
|
|
}
|
|
i = getMint64(p)
|
|
return
|
|
|
|
case muint64:
|
|
p, err = m.R.Next(9)
|
|
if err != nil {
|
|
return
|
|
}
|
|
u := getMuint64(p)
|
|
if u > math.MaxInt64 {
|
|
err = UintOverflow{Value: u, FailedBitsize: 64}
|
|
return
|
|
}
|
|
i = int64(u)
|
|
return
|
|
|
|
default:
|
|
err = badPrefix(IntType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadInt32 reads an int32 from the reader
|
|
func (m *Reader) ReadInt32() (i int32, err error) {
|
|
var in int64
|
|
in, err = m.ReadInt64()
|
|
if in > math.MaxInt32 || in < math.MinInt32 {
|
|
err = IntOverflow{Value: in, FailedBitsize: 32}
|
|
return
|
|
}
|
|
i = int32(in)
|
|
return
|
|
}
|
|
|
|
// ReadInt16 reads an int16 from the reader
|
|
func (m *Reader) ReadInt16() (i int16, err error) {
|
|
var in int64
|
|
in, err = m.ReadInt64()
|
|
if in > math.MaxInt16 || in < math.MinInt16 {
|
|
err = IntOverflow{Value: in, FailedBitsize: 16}
|
|
return
|
|
}
|
|
i = int16(in)
|
|
return
|
|
}
|
|
|
|
// ReadInt8 reads an int8 from the reader
|
|
func (m *Reader) ReadInt8() (i int8, err error) {
|
|
var in int64
|
|
in, err = m.ReadInt64()
|
|
if in > math.MaxInt8 || in < math.MinInt8 {
|
|
err = IntOverflow{Value: in, FailedBitsize: 8}
|
|
return
|
|
}
|
|
i = int8(in)
|
|
return
|
|
}
|
|
|
|
// ReadInt reads an int from the reader
|
|
func (m *Reader) ReadInt() (i int, err error) {
|
|
if smallint {
|
|
var in int32
|
|
in, err = m.ReadInt32()
|
|
i = int(in)
|
|
return
|
|
}
|
|
var in int64
|
|
in, err = m.ReadInt64()
|
|
i = int(in)
|
|
return
|
|
}
|
|
|
|
// ReadUint64 reads a uint64 from the reader
|
|
func (m *Reader) ReadUint64() (u uint64, err error) {
|
|
var p []byte
|
|
var lead byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead = p[0]
|
|
if isfixint(lead) {
|
|
u = uint64(rfixint(lead))
|
|
_, err = m.R.Skip(1)
|
|
return
|
|
}
|
|
switch lead {
|
|
case mint8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
v := int64(getMint8(p))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
return
|
|
|
|
case muint8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
u = uint64(getMuint8(p))
|
|
return
|
|
|
|
case mint16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
v := int64(getMint16(p))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
return
|
|
|
|
case muint16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
u = uint64(getMuint16(p))
|
|
return
|
|
|
|
case mint32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
v := int64(getMint32(p))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
return
|
|
|
|
case muint32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
u = uint64(getMuint32(p))
|
|
return
|
|
|
|
case mint64:
|
|
p, err = m.R.Next(9)
|
|
if err != nil {
|
|
return
|
|
}
|
|
v := int64(getMint64(p))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
return
|
|
|
|
case muint64:
|
|
p, err = m.R.Next(9)
|
|
if err != nil {
|
|
return
|
|
}
|
|
u = getMuint64(p)
|
|
return
|
|
|
|
default:
|
|
if isnfixint(lead) {
|
|
err = UintBelowZero{Value: int64(rnfixint(lead))}
|
|
} else {
|
|
err = badPrefix(UintType, lead)
|
|
}
|
|
return
|
|
|
|
}
|
|
}
|
|
|
|
// ReadUint32 reads a uint32 from the reader
|
|
func (m *Reader) ReadUint32() (u uint32, err error) {
|
|
var in uint64
|
|
in, err = m.ReadUint64()
|
|
if in > math.MaxUint32 {
|
|
err = UintOverflow{Value: in, FailedBitsize: 32}
|
|
return
|
|
}
|
|
u = uint32(in)
|
|
return
|
|
}
|
|
|
|
// ReadUint16 reads a uint16 from the reader
|
|
func (m *Reader) ReadUint16() (u uint16, err error) {
|
|
var in uint64
|
|
in, err = m.ReadUint64()
|
|
if in > math.MaxUint16 {
|
|
err = UintOverflow{Value: in, FailedBitsize: 16}
|
|
return
|
|
}
|
|
u = uint16(in)
|
|
return
|
|
}
|
|
|
|
// ReadUint8 reads a uint8 from the reader
|
|
func (m *Reader) ReadUint8() (u uint8, err error) {
|
|
var in uint64
|
|
in, err = m.ReadUint64()
|
|
if in > math.MaxUint8 {
|
|
err = UintOverflow{Value: in, FailedBitsize: 8}
|
|
return
|
|
}
|
|
u = uint8(in)
|
|
return
|
|
}
|
|
|
|
// ReadUint reads a uint from the reader
|
|
func (m *Reader) ReadUint() (u uint, err error) {
|
|
if smallint {
|
|
var un uint32
|
|
un, err = m.ReadUint32()
|
|
u = uint(un)
|
|
return
|
|
}
|
|
var un uint64
|
|
un, err = m.ReadUint64()
|
|
u = uint(un)
|
|
return
|
|
}
|
|
|
|
// ReadByte is analogous to ReadUint8.
|
|
//
|
|
// NOTE: this is *not* an implementation
|
|
// of io.ByteReader.
|
|
func (m *Reader) ReadByte() (b byte, err error) {
|
|
var in uint64
|
|
in, err = m.ReadUint64()
|
|
if in > math.MaxUint8 {
|
|
err = UintOverflow{Value: in, FailedBitsize: 8}
|
|
return
|
|
}
|
|
b = byte(in)
|
|
return
|
|
}
|
|
|
|
// ReadBytes reads a MessagePack 'bin' object
|
|
// from the reader and returns its value. It may
|
|
// use 'scratch' for storage if it is non-nil.
|
|
func (m *Reader) ReadBytes(scratch []byte) (b []byte, err error) {
|
|
var p []byte
|
|
var lead byte
|
|
p, err = m.R.Peek(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead = p[0]
|
|
var read int64
|
|
switch lead {
|
|
case mbin8:
|
|
read = int64(p[1])
|
|
m.R.Skip(2)
|
|
case mbin16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint16(p[1:]))
|
|
case mbin32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint32(p[1:]))
|
|
default:
|
|
err = badPrefix(BinType, lead)
|
|
return
|
|
}
|
|
if int64(cap(scratch)) < read {
|
|
b = make([]byte, read)
|
|
} else {
|
|
b = scratch[0:read]
|
|
}
|
|
_, err = m.R.ReadFull(b)
|
|
return
|
|
}
|
|
|
|
// ReadBytesHeader reads the size header
|
|
// of a MessagePack 'bin' object. The user
|
|
// is responsible for dealing with the next
|
|
// 'sz' bytes from the reader in an application-specific
|
|
// way.
|
|
func (m *Reader) ReadBytesHeader() (sz uint32, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
switch p[0] {
|
|
case mbin8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = uint32(p[1])
|
|
return
|
|
case mbin16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = uint32(big.Uint16(p[1:]))
|
|
return
|
|
case mbin32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = uint32(big.Uint32(p[1:]))
|
|
return
|
|
default:
|
|
err = badPrefix(BinType, p[0])
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadExactBytes reads a MessagePack 'bin'-encoded
|
|
// object off of the wire into the provided slice. An
|
|
// ArrayError will be returned if the object is not
|
|
// exactly the length of the input slice.
|
|
func (m *Reader) ReadExactBytes(into []byte) error {
|
|
p, err := m.R.Peek(2)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
lead := p[0]
|
|
var read int64 // bytes to read
|
|
var skip int // prefix size to skip
|
|
switch lead {
|
|
case mbin8:
|
|
read = int64(p[1])
|
|
skip = 2
|
|
case mbin16:
|
|
p, err = m.R.Peek(3)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
read = int64(big.Uint16(p[1:]))
|
|
skip = 3
|
|
case mbin32:
|
|
p, err = m.R.Peek(5)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
read = int64(big.Uint32(p[1:]))
|
|
skip = 5
|
|
default:
|
|
return badPrefix(BinType, lead)
|
|
}
|
|
if read != int64(len(into)) {
|
|
return ArrayError{Wanted: uint32(len(into)), Got: uint32(read)}
|
|
}
|
|
m.R.Skip(skip)
|
|
_, err = m.R.ReadFull(into)
|
|
return err
|
|
}
|
|
|
|
// ReadStringAsBytes reads a MessagePack 'str' (utf-8) string
|
|
// and returns its value as bytes. It may use 'scratch' for storage
|
|
// if it is non-nil.
|
|
func (m *Reader) ReadStringAsBytes(scratch []byte) (b []byte, err error) {
|
|
var p []byte
|
|
var lead byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead = p[0]
|
|
var read int64
|
|
|
|
if isfixstr(lead) {
|
|
read = int64(rfixstr(lead))
|
|
m.R.Skip(1)
|
|
goto fill
|
|
}
|
|
|
|
switch lead {
|
|
case mstr8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(uint8(p[1]))
|
|
case mstr16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint16(p[1:]))
|
|
case mstr32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint32(p[1:]))
|
|
default:
|
|
err = badPrefix(StrType, lead)
|
|
return
|
|
}
|
|
fill:
|
|
if int64(cap(scratch)) < read {
|
|
b = make([]byte, read)
|
|
} else {
|
|
b = scratch[0:read]
|
|
}
|
|
_, err = m.R.ReadFull(b)
|
|
return
|
|
}
|
|
|
|
// ReadStringHeader reads a string header
|
|
// off of the wire. The user is then responsible
|
|
// for dealing with the next 'sz' bytes from
|
|
// the reader in an application-specific manner.
|
|
func (m *Reader) ReadStringHeader() (sz uint32, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead := p[0]
|
|
if isfixstr(lead) {
|
|
sz = uint32(rfixstr(lead))
|
|
m.R.Skip(1)
|
|
return
|
|
}
|
|
switch lead {
|
|
case mstr8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = uint32(p[1])
|
|
return
|
|
case mstr16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = uint32(big.Uint16(p[1:]))
|
|
return
|
|
case mstr32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sz = big.Uint32(p[1:])
|
|
return
|
|
default:
|
|
err = badPrefix(StrType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadString reads a utf-8 string from the reader
|
|
func (m *Reader) ReadString() (s string, err error) {
|
|
var p []byte
|
|
var lead byte
|
|
var read int64
|
|
p, err = m.R.Peek(1)
|
|
if err != nil {
|
|
return
|
|
}
|
|
lead = p[0]
|
|
|
|
if isfixstr(lead) {
|
|
read = int64(rfixstr(lead))
|
|
m.R.Skip(1)
|
|
goto fill
|
|
}
|
|
|
|
switch lead {
|
|
case mstr8:
|
|
p, err = m.R.Next(2)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(uint8(p[1]))
|
|
case mstr16:
|
|
p, err = m.R.Next(3)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint16(p[1:]))
|
|
case mstr32:
|
|
p, err = m.R.Next(5)
|
|
if err != nil {
|
|
return
|
|
}
|
|
read = int64(big.Uint32(p[1:]))
|
|
default:
|
|
err = badPrefix(StrType, lead)
|
|
return
|
|
}
|
|
fill:
|
|
if read == 0 {
|
|
s, err = "", nil
|
|
return
|
|
}
|
|
// reading into the memory
|
|
// that will become the string
|
|
// itself has vastly superior
|
|
// worst-case performance, because
|
|
// the reader buffer doesn't have
|
|
// to be large enough to hold the string.
|
|
// the idea here is to make it more
|
|
// difficult for someone malicious
|
|
// to cause the system to run out of
|
|
// memory by sending very large strings.
|
|
//
|
|
// NOTE: this works because the argument
|
|
// passed to (*fwd.Reader).ReadFull escapes
|
|
// to the heap; its argument may, in turn,
|
|
// be passed to the underlying reader, and
|
|
// thus escape analysis *must* conclude that
|
|
// 'out' escapes.
|
|
out := make([]byte, read)
|
|
_, err = m.R.ReadFull(out)
|
|
if err != nil {
|
|
return
|
|
}
|
|
s = UnsafeString(out)
|
|
return
|
|
}
|
|
|
|
// ReadComplex64 reads a complex64 from the reader
|
|
func (m *Reader) ReadComplex64() (f complex64, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(10)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if p[0] != mfixext8 {
|
|
err = badPrefix(Complex64Type, p[0])
|
|
return
|
|
}
|
|
if int8(p[1]) != Complex64Extension {
|
|
err = errExt(int8(p[1]), Complex64Extension)
|
|
return
|
|
}
|
|
f = complex(math.Float32frombits(big.Uint32(p[2:])),
|
|
math.Float32frombits(big.Uint32(p[6:])))
|
|
_, err = m.R.Skip(10)
|
|
return
|
|
}
|
|
|
|
// ReadComplex128 reads a complex128 from the reader
|
|
func (m *Reader) ReadComplex128() (f complex128, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(18)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if p[0] != mfixext16 {
|
|
err = badPrefix(Complex128Type, p[0])
|
|
return
|
|
}
|
|
if int8(p[1]) != Complex128Extension {
|
|
err = errExt(int8(p[1]), Complex128Extension)
|
|
return
|
|
}
|
|
f = complex(math.Float64frombits(big.Uint64(p[2:])),
|
|
math.Float64frombits(big.Uint64(p[10:])))
|
|
_, err = m.R.Skip(18)
|
|
return
|
|
}
|
|
|
|
// ReadMapStrIntf reads a MessagePack map into a map[string]interface{}.
|
|
// (You must pass a non-nil map into the function.)
|
|
func (m *Reader) ReadMapStrIntf(mp map[string]interface{}) (err error) {
|
|
var sz uint32
|
|
sz, err = m.ReadMapHeader()
|
|
if err != nil {
|
|
return
|
|
}
|
|
for key := range mp {
|
|
delete(mp, key)
|
|
}
|
|
for i := uint32(0); i < sz; i++ {
|
|
var key string
|
|
var val interface{}
|
|
key, err = m.ReadString()
|
|
if err != nil {
|
|
return
|
|
}
|
|
val, err = m.ReadIntf()
|
|
if err != nil {
|
|
return
|
|
}
|
|
mp[key] = val
|
|
}
|
|
return
|
|
}
|
|
|
|
// ReadTime reads a time.Time object from the reader.
|
|
// The returned time's location will be set to time.Local.
|
|
func (m *Reader) ReadTime() (t time.Time, err error) {
|
|
var p []byte
|
|
p, err = m.R.Peek(15)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if p[0] != mext8 || p[1] != 12 {
|
|
err = badPrefix(TimeType, p[0])
|
|
return
|
|
}
|
|
if int8(p[2]) != TimeExtension {
|
|
err = errExt(int8(p[2]), TimeExtension)
|
|
return
|
|
}
|
|
sec, nsec := getUnix(p[3:])
|
|
t = time.Unix(sec, int64(nsec)).Local()
|
|
_, err = m.R.Skip(15)
|
|
return
|
|
}
|
|
|
|
// ReadIntf reads out the next object as a raw interface{}.
|
|
// Arrays are decoded as []interface{}, and maps are decoded
|
|
// as map[string]interface{}. Integers are decoded as int64
|
|
// and unsigned integers are decoded as uint64.
|
|
func (m *Reader) ReadIntf() (i interface{}, err error) {
|
|
var t Type
|
|
t, err = m.NextType()
|
|
if err != nil {
|
|
return
|
|
}
|
|
switch t {
|
|
case BoolType:
|
|
i, err = m.ReadBool()
|
|
return
|
|
|
|
case IntType:
|
|
i, err = m.ReadInt64()
|
|
return
|
|
|
|
case UintType:
|
|
i, err = m.ReadUint64()
|
|
return
|
|
|
|
case BinType:
|
|
i, err = m.ReadBytes(nil)
|
|
return
|
|
|
|
case StrType:
|
|
i, err = m.ReadString()
|
|
return
|
|
|
|
case Complex64Type:
|
|
i, err = m.ReadComplex64()
|
|
return
|
|
|
|
case Complex128Type:
|
|
i, err = m.ReadComplex128()
|
|
return
|
|
|
|
case TimeType:
|
|
i, err = m.ReadTime()
|
|
return
|
|
|
|
case ExtensionType:
|
|
var t int8
|
|
t, err = m.peekExtensionType()
|
|
if err != nil {
|
|
return
|
|
}
|
|
f, ok := extensionReg[t]
|
|
if ok {
|
|
e := f()
|
|
err = m.ReadExtension(e)
|
|
i = e
|
|
return
|
|
}
|
|
var e RawExtension
|
|
e.Type = t
|
|
err = m.ReadExtension(&e)
|
|
i = &e
|
|
return
|
|
|
|
case MapType:
|
|
mp := make(map[string]interface{})
|
|
err = m.ReadMapStrIntf(mp)
|
|
i = mp
|
|
return
|
|
|
|
case NilType:
|
|
err = m.ReadNil()
|
|
i = nil
|
|
return
|
|
|
|
case Float32Type:
|
|
i, err = m.ReadFloat32()
|
|
return
|
|
|
|
case Float64Type:
|
|
i, err = m.ReadFloat64()
|
|
return
|
|
|
|
case ArrayType:
|
|
var sz uint32
|
|
sz, err = m.ReadArrayHeader()
|
|
|
|
if err != nil {
|
|
return
|
|
}
|
|
out := make([]interface{}, int(sz))
|
|
for j := range out {
|
|
out[j], err = m.ReadIntf()
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
i = out
|
|
return
|
|
|
|
default:
|
|
return nil, fatal // unreachable
|
|
}
|
|
}
|