You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1197 lines
23 KiB
1197 lines
23 KiB
package msgp
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"math"
|
|
"time"
|
|
)
|
|
|
|
var big = binary.BigEndian
|
|
|
|
// NextType returns the type of the next
|
|
// object in the slice. If the length
|
|
// of the input is zero, it returns
|
|
// InvalidType.
|
|
func NextType(b []byte) Type {
|
|
if len(b) == 0 {
|
|
return InvalidType
|
|
}
|
|
spec := sizes[b[0]]
|
|
t := spec.typ
|
|
if t == ExtensionType && len(b) > int(spec.size) {
|
|
var tp int8
|
|
if spec.extra == constsize {
|
|
tp = int8(b[1])
|
|
} else {
|
|
tp = int8(b[spec.size-1])
|
|
}
|
|
switch tp {
|
|
case TimeExtension:
|
|
return TimeType
|
|
case Complex128Extension:
|
|
return Complex128Type
|
|
case Complex64Extension:
|
|
return Complex64Type
|
|
default:
|
|
return ExtensionType
|
|
}
|
|
}
|
|
return t
|
|
}
|
|
|
|
// IsNil returns true if len(b)>0 and
|
|
// the leading byte is a 'nil' MessagePack
|
|
// byte; false otherwise
|
|
func IsNil(b []byte) bool {
|
|
if len(b) != 0 && b[0] == mnil {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Raw is raw MessagePack.
|
|
// Raw allows you to read and write
|
|
// data without interpreting its contents.
|
|
type Raw []byte
|
|
|
|
// MarshalMsg implements msgp.Marshaler.
|
|
// It appends the raw contents of 'raw'
|
|
// to the provided byte slice. If 'raw'
|
|
// is 0 bytes, 'nil' will be appended instead.
|
|
func (r Raw) MarshalMsg(b []byte) ([]byte, error) {
|
|
i := len(r)
|
|
if i == 0 {
|
|
return AppendNil(b), nil
|
|
}
|
|
o, l := ensure(b, i)
|
|
copy(o[l:], []byte(r))
|
|
return o, nil
|
|
}
|
|
|
|
// UnmarshalMsg implements msgp.Unmarshaler.
|
|
// It sets the contents of *Raw to be the next
|
|
// object in the provided byte slice.
|
|
func (r *Raw) UnmarshalMsg(b []byte) ([]byte, error) {
|
|
l := len(b)
|
|
out, err := Skip(b)
|
|
if err != nil {
|
|
return b, err
|
|
}
|
|
rlen := l - len(out)
|
|
if IsNil(b[:rlen]) {
|
|
rlen = 0
|
|
}
|
|
if cap(*r) < rlen {
|
|
*r = make(Raw, rlen)
|
|
} else {
|
|
*r = (*r)[0:rlen]
|
|
}
|
|
copy(*r, b[:rlen])
|
|
return out, nil
|
|
}
|
|
|
|
// EncodeMsg implements msgp.Encodable.
|
|
// It writes the raw bytes to the writer.
|
|
// If r is empty, it writes 'nil' instead.
|
|
func (r Raw) EncodeMsg(w *Writer) error {
|
|
if len(r) == 0 {
|
|
return w.WriteNil()
|
|
}
|
|
_, err := w.Write([]byte(r))
|
|
return err
|
|
}
|
|
|
|
// DecodeMsg implements msgp.Decodable.
|
|
// It sets the value of *Raw to be the
|
|
// next object on the wire.
|
|
func (r *Raw) DecodeMsg(f *Reader) error {
|
|
*r = (*r)[:0]
|
|
err := appendNext(f, (*[]byte)(r))
|
|
if IsNil(*r) {
|
|
*r = (*r)[:0]
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Msgsize implements msgp.Sizer
|
|
func (r Raw) Msgsize() int {
|
|
l := len(r)
|
|
if l == 0 {
|
|
return 1 // for 'nil'
|
|
}
|
|
return l
|
|
}
|
|
|
|
func appendNext(f *Reader, d *[]byte) error {
|
|
amt, o, err := getNextSize(f.R)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var i int
|
|
*d, i = ensure(*d, int(amt))
|
|
_, err = f.R.ReadFull((*d)[i:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for o > 0 {
|
|
err = appendNext(f, d)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o--
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON implements json.Marshaler
|
|
func (r *Raw) MarshalJSON() ([]byte, error) {
|
|
var buf bytes.Buffer
|
|
_, err := UnmarshalAsJSON(&buf, []byte(*r))
|
|
return buf.Bytes(), err
|
|
}
|
|
|
|
// ReadMapHeaderBytes reads a map header size
|
|
// from 'b' and returns the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a map)
|
|
func ReadMapHeaderBytes(b []byte) (sz uint32, o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
lead := b[0]
|
|
if isfixmap(lead) {
|
|
sz = uint32(rfixmap(lead))
|
|
o = b[1:]
|
|
return
|
|
}
|
|
|
|
switch lead {
|
|
case mmap16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
sz = uint32(big.Uint16(b[1:]))
|
|
o = b[3:]
|
|
return
|
|
|
|
case mmap32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
sz = big.Uint32(b[1:])
|
|
o = b[5:]
|
|
return
|
|
|
|
default:
|
|
err = badPrefix(MapType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadMapKeyZC attempts to read a map key
|
|
// from 'b' and returns the key bytes and the remaining bytes
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a str or bin)
|
|
func ReadMapKeyZC(b []byte) ([]byte, []byte, error) {
|
|
o, b, err := ReadStringZC(b)
|
|
if err != nil {
|
|
if tperr, ok := err.(TypeError); ok && tperr.Encoded == BinType {
|
|
return ReadBytesZC(b)
|
|
}
|
|
return nil, b, err
|
|
}
|
|
return o, b, nil
|
|
}
|
|
|
|
// ReadArrayHeaderBytes attempts to read
|
|
// the array header size off of 'b' and return
|
|
// the size and remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not an array)
|
|
func ReadArrayHeaderBytes(b []byte) (sz uint32, o []byte, err error) {
|
|
if len(b) < 1 {
|
|
return 0, nil, ErrShortBytes
|
|
}
|
|
lead := b[0]
|
|
if isfixarray(lead) {
|
|
sz = uint32(rfixarray(lead))
|
|
o = b[1:]
|
|
return
|
|
}
|
|
|
|
switch lead {
|
|
case marray16:
|
|
if len(b) < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
sz = uint32(big.Uint16(b[1:]))
|
|
o = b[3:]
|
|
return
|
|
|
|
case marray32:
|
|
if len(b) < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
sz = big.Uint32(b[1:])
|
|
o = b[5:]
|
|
return
|
|
|
|
default:
|
|
err = badPrefix(ArrayType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadNilBytes tries to read a "nil" byte
|
|
// off of 'b' and return the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a 'nil')
|
|
// - InvalidPrefixError
|
|
func ReadNilBytes(b []byte) ([]byte, error) {
|
|
if len(b) < 1 {
|
|
return nil, ErrShortBytes
|
|
}
|
|
if b[0] != mnil {
|
|
return b, badPrefix(NilType, b[0])
|
|
}
|
|
return b[1:], nil
|
|
}
|
|
|
|
// ReadFloat64Bytes tries to read a float64
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a float64)
|
|
func ReadFloat64Bytes(b []byte) (f float64, o []byte, err error) {
|
|
if len(b) < 9 {
|
|
if len(b) >= 5 && b[0] == mfloat32 {
|
|
var tf float32
|
|
tf, o, err = ReadFloat32Bytes(b)
|
|
f = float64(tf)
|
|
return
|
|
}
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
if b[0] != mfloat64 {
|
|
if b[0] == mfloat32 {
|
|
var tf float32
|
|
tf, o, err = ReadFloat32Bytes(b)
|
|
f = float64(tf)
|
|
return
|
|
}
|
|
err = badPrefix(Float64Type, b[0])
|
|
return
|
|
}
|
|
|
|
f = math.Float64frombits(getMuint64(b))
|
|
o = b[9:]
|
|
return
|
|
}
|
|
|
|
// ReadFloat32Bytes tries to read a float64
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a float32)
|
|
func ReadFloat32Bytes(b []byte) (f float32, o []byte, err error) {
|
|
if len(b) < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
if b[0] != mfloat32 {
|
|
err = TypeError{Method: Float32Type, Encoded: getType(b[0])}
|
|
return
|
|
}
|
|
|
|
f = math.Float32frombits(getMuint32(b))
|
|
o = b[5:]
|
|
return
|
|
}
|
|
|
|
// ReadBoolBytes tries to read a float64
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a bool)
|
|
func ReadBoolBytes(b []byte) (bool, []byte, error) {
|
|
if len(b) < 1 {
|
|
return false, b, ErrShortBytes
|
|
}
|
|
switch b[0] {
|
|
case mtrue:
|
|
return true, b[1:], nil
|
|
case mfalse:
|
|
return false, b[1:], nil
|
|
default:
|
|
return false, b, badPrefix(BoolType, b[0])
|
|
}
|
|
}
|
|
|
|
// ReadInt64Bytes tries to read an int64
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError (not a int)
|
|
func ReadInt64Bytes(b []byte) (i int64, o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
return 0, nil, ErrShortBytes
|
|
}
|
|
|
|
lead := b[0]
|
|
if isfixint(lead) {
|
|
i = int64(rfixint(lead))
|
|
o = b[1:]
|
|
return
|
|
}
|
|
if isnfixint(lead) {
|
|
i = int64(rnfixint(lead))
|
|
o = b[1:]
|
|
return
|
|
}
|
|
|
|
switch lead {
|
|
case mint8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMint8(b))
|
|
o = b[2:]
|
|
return
|
|
|
|
case muint8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMuint8(b))
|
|
o = b[2:]
|
|
return
|
|
|
|
case mint16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMint16(b))
|
|
o = b[3:]
|
|
return
|
|
|
|
case muint16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMuint16(b))
|
|
o = b[3:]
|
|
return
|
|
|
|
case mint32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMint32(b))
|
|
o = b[5:]
|
|
return
|
|
|
|
case muint32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMuint32(b))
|
|
o = b[5:]
|
|
return
|
|
|
|
case mint64:
|
|
if l < 9 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
i = int64(getMint64(b))
|
|
o = b[9:]
|
|
return
|
|
|
|
case muint64:
|
|
if l < 9 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
u := getMuint64(b)
|
|
if u > math.MaxInt64 {
|
|
err = UintOverflow{Value: u, FailedBitsize: 64}
|
|
return
|
|
}
|
|
i = int64(u)
|
|
o = b[9:]
|
|
return
|
|
|
|
default:
|
|
err = badPrefix(IntType, lead)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadInt32Bytes tries to read an int32
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a int)
|
|
// - IntOverflow{} (value doesn't fit in int32)
|
|
func ReadInt32Bytes(b []byte) (int32, []byte, error) {
|
|
i, o, err := ReadInt64Bytes(b)
|
|
if i > math.MaxInt32 || i < math.MinInt32 {
|
|
return 0, o, IntOverflow{Value: i, FailedBitsize: 32}
|
|
}
|
|
return int32(i), o, err
|
|
}
|
|
|
|
// ReadInt16Bytes tries to read an int16
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a int)
|
|
// - IntOverflow{} (value doesn't fit in int16)
|
|
func ReadInt16Bytes(b []byte) (int16, []byte, error) {
|
|
i, o, err := ReadInt64Bytes(b)
|
|
if i > math.MaxInt16 || i < math.MinInt16 {
|
|
return 0, o, IntOverflow{Value: i, FailedBitsize: 16}
|
|
}
|
|
return int16(i), o, err
|
|
}
|
|
|
|
// ReadInt8Bytes tries to read an int16
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a int)
|
|
// - IntOverflow{} (value doesn't fit in int8)
|
|
func ReadInt8Bytes(b []byte) (int8, []byte, error) {
|
|
i, o, err := ReadInt64Bytes(b)
|
|
if i > math.MaxInt8 || i < math.MinInt8 {
|
|
return 0, o, IntOverflow{Value: i, FailedBitsize: 8}
|
|
}
|
|
return int8(i), o, err
|
|
}
|
|
|
|
// ReadIntBytes tries to read an int
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a int)
|
|
// - IntOverflow{} (value doesn't fit in int; 32-bit platforms only)
|
|
func ReadIntBytes(b []byte) (int, []byte, error) {
|
|
if smallint {
|
|
i, b, err := ReadInt32Bytes(b)
|
|
return int(i), b, err
|
|
}
|
|
i, b, err := ReadInt64Bytes(b)
|
|
return int(i), b, err
|
|
}
|
|
|
|
// ReadUint64Bytes tries to read a uint64
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a uint)
|
|
func ReadUint64Bytes(b []byte) (u uint64, o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
return 0, nil, ErrShortBytes
|
|
}
|
|
|
|
lead := b[0]
|
|
if isfixint(lead) {
|
|
u = uint64(rfixint(lead))
|
|
o = b[1:]
|
|
return
|
|
}
|
|
|
|
switch lead {
|
|
case mint8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
v := int64(getMint8(b))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
o = b[2:]
|
|
return
|
|
|
|
case muint8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
u = uint64(getMuint8(b))
|
|
o = b[2:]
|
|
return
|
|
|
|
case mint16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
v := int64(getMint16(b))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
o = b[3:]
|
|
return
|
|
|
|
case muint16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
u = uint64(getMuint16(b))
|
|
o = b[3:]
|
|
return
|
|
|
|
case mint32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
v := int64(getMint32(b))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
o = b[5:]
|
|
return
|
|
|
|
case muint32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
u = uint64(getMuint32(b))
|
|
o = b[5:]
|
|
return
|
|
|
|
case mint64:
|
|
if l < 9 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
v := int64(getMint64(b))
|
|
if v < 0 {
|
|
err = UintBelowZero{Value: v}
|
|
return
|
|
}
|
|
u = uint64(v)
|
|
o = b[9:]
|
|
return
|
|
|
|
case muint64:
|
|
if l < 9 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
u = getMuint64(b)
|
|
o = b[9:]
|
|
return
|
|
|
|
default:
|
|
if isnfixint(lead) {
|
|
err = UintBelowZero{Value: int64(rnfixint(lead))}
|
|
} else {
|
|
err = badPrefix(UintType, lead)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
// ReadUint32Bytes tries to read a uint32
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a uint)
|
|
// - UintOverflow{} (value too large for uint32)
|
|
func ReadUint32Bytes(b []byte) (uint32, []byte, error) {
|
|
v, o, err := ReadUint64Bytes(b)
|
|
if v > math.MaxUint32 {
|
|
return 0, nil, UintOverflow{Value: v, FailedBitsize: 32}
|
|
}
|
|
return uint32(v), o, err
|
|
}
|
|
|
|
// ReadUint16Bytes tries to read a uint16
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a uint)
|
|
// - UintOverflow{} (value too large for uint16)
|
|
func ReadUint16Bytes(b []byte) (uint16, []byte, error) {
|
|
v, o, err := ReadUint64Bytes(b)
|
|
if v > math.MaxUint16 {
|
|
return 0, nil, UintOverflow{Value: v, FailedBitsize: 16}
|
|
}
|
|
return uint16(v), o, err
|
|
}
|
|
|
|
// ReadUint8Bytes tries to read a uint8
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a uint)
|
|
// - UintOverflow{} (value too large for uint8)
|
|
func ReadUint8Bytes(b []byte) (uint8, []byte, error) {
|
|
v, o, err := ReadUint64Bytes(b)
|
|
if v > math.MaxUint8 {
|
|
return 0, nil, UintOverflow{Value: v, FailedBitsize: 8}
|
|
}
|
|
return uint8(v), o, err
|
|
}
|
|
|
|
// ReadUintBytes tries to read a uint
|
|
// from 'b' and return the value and the remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a uint)
|
|
// - UintOverflow{} (value too large for uint; 32-bit platforms only)
|
|
func ReadUintBytes(b []byte) (uint, []byte, error) {
|
|
if smallint {
|
|
u, b, err := ReadUint32Bytes(b)
|
|
return uint(u), b, err
|
|
}
|
|
u, b, err := ReadUint64Bytes(b)
|
|
return uint(u), b, err
|
|
}
|
|
|
|
// ReadByteBytes is analogous to ReadUint8Bytes
|
|
func ReadByteBytes(b []byte) (byte, []byte, error) {
|
|
return ReadUint8Bytes(b)
|
|
}
|
|
|
|
// ReadBytesBytes reads a 'bin' object
|
|
// from 'b' and returns its vaue and
|
|
// the remaining bytes in 'b'.
|
|
// Possible errors:
|
|
// - ErrShortBytes (too few bytes)
|
|
// - TypeError{} (not a 'bin' object)
|
|
func ReadBytesBytes(b []byte, scratch []byte) (v []byte, o []byte, err error) {
|
|
return readBytesBytes(b, scratch, false)
|
|
}
|
|
|
|
func readBytesBytes(b []byte, scratch []byte, zc bool) (v []byte, o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
return nil, nil, ErrShortBytes
|
|
}
|
|
|
|
lead := b[0]
|
|
var read int
|
|
switch lead {
|
|
case mbin8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
read = int(b[1])
|
|
b = b[2:]
|
|
|
|
case mbin16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = int(big.Uint16(b[1:]))
|
|
b = b[3:]
|
|
|
|
case mbin32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = int(big.Uint32(b[1:]))
|
|
b = b[5:]
|
|
|
|
default:
|
|
err = badPrefix(BinType, lead)
|
|
return
|
|
}
|
|
|
|
if len(b) < read {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
// zero-copy
|
|
if zc {
|
|
v = b[0:read]
|
|
o = b[read:]
|
|
return
|
|
}
|
|
|
|
if cap(scratch) >= read {
|
|
v = scratch[0:read]
|
|
} else {
|
|
v = make([]byte, read)
|
|
}
|
|
|
|
o = b[copy(v, b):]
|
|
return
|
|
}
|
|
|
|
// ReadBytesZC extracts the messagepack-encoded
|
|
// binary field without copying. The returned []byte
|
|
// points to the same memory as the input slice.
|
|
// Possible errors:
|
|
// - ErrShortBytes (b not long enough)
|
|
// - TypeError{} (object not 'bin')
|
|
func ReadBytesZC(b []byte) (v []byte, o []byte, err error) {
|
|
return readBytesBytes(b, nil, true)
|
|
}
|
|
|
|
func ReadExactBytes(b []byte, into []byte) (o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
lead := b[0]
|
|
var read uint32
|
|
var skip int
|
|
switch lead {
|
|
case mbin8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
read = uint32(b[1])
|
|
skip = 2
|
|
|
|
case mbin16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = uint32(big.Uint16(b[1:]))
|
|
skip = 3
|
|
|
|
case mbin32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = uint32(big.Uint32(b[1:]))
|
|
skip = 5
|
|
|
|
default:
|
|
err = badPrefix(BinType, lead)
|
|
return
|
|
}
|
|
|
|
if read != uint32(len(into)) {
|
|
err = ArrayError{Wanted: uint32(len(into)), Got: read}
|
|
return
|
|
}
|
|
|
|
o = b[skip+copy(into, b[skip:]):]
|
|
return
|
|
}
|
|
|
|
// ReadStringZC reads a messagepack string field
|
|
// without copying. The returned []byte points
|
|
// to the same memory as the input slice.
|
|
// Possible errors:
|
|
// - ErrShortBytes (b not long enough)
|
|
// - TypeError{} (object not 'str')
|
|
func ReadStringZC(b []byte) (v []byte, o []byte, err error) {
|
|
l := len(b)
|
|
if l < 1 {
|
|
return nil, nil, ErrShortBytes
|
|
}
|
|
|
|
lead := b[0]
|
|
var read int
|
|
|
|
if isfixstr(lead) {
|
|
read = int(rfixstr(lead))
|
|
b = b[1:]
|
|
} else {
|
|
switch lead {
|
|
case mstr8:
|
|
if l < 2 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = int(b[1])
|
|
b = b[2:]
|
|
|
|
case mstr16:
|
|
if l < 3 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = int(big.Uint16(b[1:]))
|
|
b = b[3:]
|
|
|
|
case mstr32:
|
|
if l < 5 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
read = int(big.Uint32(b[1:]))
|
|
b = b[5:]
|
|
|
|
default:
|
|
err = TypeError{Method: StrType, Encoded: getType(lead)}
|
|
return
|
|
}
|
|
}
|
|
|
|
if len(b) < read {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
v = b[0:read]
|
|
o = b[read:]
|
|
return
|
|
}
|
|
|
|
// ReadStringBytes reads a 'str' object
|
|
// from 'b' and returns its value and the
|
|
// remaining bytes in 'b'.
|
|
// Possible errors:
|
|
// - ErrShortBytes (b not long enough)
|
|
// - TypeError{} (not 'str' type)
|
|
// - InvalidPrefixError
|
|
func ReadStringBytes(b []byte) (string, []byte, error) {
|
|
v, o, err := ReadStringZC(b)
|
|
return string(v), o, err
|
|
}
|
|
|
|
// ReadStringAsBytes reads a 'str' object
|
|
// into a slice of bytes. 'v' is the value of
|
|
// the 'str' object, which may reside in memory
|
|
// pointed to by 'scratch.' 'o' is the remaining bytes
|
|
// in 'b.''
|
|
// Possible errors:
|
|
// - ErrShortBytes (b not long enough)
|
|
// - TypeError{} (not 'str' type)
|
|
// - InvalidPrefixError (unknown type marker)
|
|
func ReadStringAsBytes(b []byte, scratch []byte) (v []byte, o []byte, err error) {
|
|
var tmp []byte
|
|
tmp, o, err = ReadStringZC(b)
|
|
v = append(scratch[:0], tmp...)
|
|
return
|
|
}
|
|
|
|
// ReadComplex128Bytes reads a complex128
|
|
// extension object from 'b' and returns the
|
|
// remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (not enough bytes in 'b')
|
|
// - TypeError{} (object not a complex128)
|
|
// - InvalidPrefixError
|
|
// - ExtensionTypeError{} (object an extension of the correct size, but not a complex128)
|
|
func ReadComplex128Bytes(b []byte) (c complex128, o []byte, err error) {
|
|
if len(b) < 18 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
if b[0] != mfixext16 {
|
|
err = badPrefix(Complex128Type, b[0])
|
|
return
|
|
}
|
|
if int8(b[1]) != Complex128Extension {
|
|
err = errExt(int8(b[1]), Complex128Extension)
|
|
return
|
|
}
|
|
c = complex(math.Float64frombits(big.Uint64(b[2:])),
|
|
math.Float64frombits(big.Uint64(b[10:])))
|
|
o = b[18:]
|
|
return
|
|
}
|
|
|
|
// ReadComplex64Bytes reads a complex64
|
|
// extension object from 'b' and returns the
|
|
// remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (not enough bytes in 'b')
|
|
// - TypeError{} (object not a complex64)
|
|
// - ExtensionTypeError{} (object an extension of the correct size, but not a complex64)
|
|
func ReadComplex64Bytes(b []byte) (c complex64, o []byte, err error) {
|
|
if len(b) < 10 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
if b[0] != mfixext8 {
|
|
err = badPrefix(Complex64Type, b[0])
|
|
return
|
|
}
|
|
if b[1] != Complex64Extension {
|
|
err = errExt(int8(b[1]), Complex64Extension)
|
|
return
|
|
}
|
|
c = complex(math.Float32frombits(big.Uint32(b[2:])),
|
|
math.Float32frombits(big.Uint32(b[6:])))
|
|
o = b[10:]
|
|
return
|
|
}
|
|
|
|
// ReadTimeBytes reads a time.Time
|
|
// extension object from 'b' and returns the
|
|
// remaining bytes.
|
|
// Possible errors:
|
|
// - ErrShortBytes (not enough bytes in 'b')
|
|
// - TypeError{} (object not a complex64)
|
|
// - ExtensionTypeError{} (object an extension of the correct size, but not a time.Time)
|
|
func ReadTimeBytes(b []byte) (t time.Time, o []byte, err error) {
|
|
if len(b) < 15 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
if b[0] != mext8 || b[1] != 12 {
|
|
err = badPrefix(TimeType, b[0])
|
|
return
|
|
}
|
|
if int8(b[2]) != TimeExtension {
|
|
err = errExt(int8(b[2]), TimeExtension)
|
|
return
|
|
}
|
|
sec, nsec := getUnix(b[3:])
|
|
t = time.Unix(sec, int64(nsec)).Local()
|
|
o = b[15:]
|
|
return
|
|
}
|
|
|
|
// ReadMapStrIntfBytes reads a map[string]interface{}
|
|
// out of 'b' and returns the map and remaining bytes.
|
|
// If 'old' is non-nil, the values will be read into that map.
|
|
func ReadMapStrIntfBytes(b []byte, old map[string]interface{}) (v map[string]interface{}, o []byte, err error) {
|
|
var sz uint32
|
|
o = b
|
|
sz, o, err = ReadMapHeaderBytes(o)
|
|
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if old != nil {
|
|
for key := range old {
|
|
delete(old, key)
|
|
}
|
|
v = old
|
|
} else {
|
|
v = make(map[string]interface{}, int(sz))
|
|
}
|
|
|
|
for z := uint32(0); z < sz; z++ {
|
|
if len(o) < 1 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
var key []byte
|
|
key, o, err = ReadMapKeyZC(o)
|
|
if err != nil {
|
|
return
|
|
}
|
|
var val interface{}
|
|
val, o, err = ReadIntfBytes(o)
|
|
if err != nil {
|
|
return
|
|
}
|
|
v[string(key)] = val
|
|
}
|
|
return
|
|
}
|
|
|
|
// ReadIntfBytes attempts to read
|
|
// the next object out of 'b' as a raw interface{} and
|
|
// return the remaining bytes.
|
|
func ReadIntfBytes(b []byte) (i interface{}, o []byte, err error) {
|
|
if len(b) < 1 {
|
|
err = ErrShortBytes
|
|
return
|
|
}
|
|
|
|
k := NextType(b)
|
|
|
|
switch k {
|
|
case MapType:
|
|
i, o, err = ReadMapStrIntfBytes(b, nil)
|
|
return
|
|
|
|
case ArrayType:
|
|
var sz uint32
|
|
sz, o, err = ReadArrayHeaderBytes(b)
|
|
if err != nil {
|
|
return
|
|
}
|
|
j := make([]interface{}, int(sz))
|
|
i = j
|
|
for d := range j {
|
|
j[d], o, err = ReadIntfBytes(o)
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
return
|
|
|
|
case Float32Type:
|
|
i, o, err = ReadFloat32Bytes(b)
|
|
return
|
|
|
|
case Float64Type:
|
|
i, o, err = ReadFloat64Bytes(b)
|
|
return
|
|
|
|
case IntType:
|
|
i, o, err = ReadInt64Bytes(b)
|
|
return
|
|
|
|
case UintType:
|
|
i, o, err = ReadUint64Bytes(b)
|
|
return
|
|
|
|
case BoolType:
|
|
i, o, err = ReadBoolBytes(b)
|
|
return
|
|
|
|
case TimeType:
|
|
i, o, err = ReadTimeBytes(b)
|
|
return
|
|
|
|
case Complex64Type:
|
|
i, o, err = ReadComplex64Bytes(b)
|
|
return
|
|
|
|
case Complex128Type:
|
|
i, o, err = ReadComplex128Bytes(b)
|
|
return
|
|
|
|
case ExtensionType:
|
|
var t int8
|
|
t, err = peekExtension(b)
|
|
if err != nil {
|
|
return
|
|
}
|
|
// use a user-defined extension,
|
|
// if it's been registered
|
|
f, ok := extensionReg[t]
|
|
if ok {
|
|
e := f()
|
|
o, err = ReadExtensionBytes(b, e)
|
|
i = e
|
|
return
|
|
}
|
|
// last resort is a raw extension
|
|
e := RawExtension{}
|
|
e.Type = int8(t)
|
|
o, err = ReadExtensionBytes(b, &e)
|
|
i = &e
|
|
return
|
|
|
|
case NilType:
|
|
o, err = ReadNilBytes(b)
|
|
return
|
|
|
|
case BinType:
|
|
i, o, err = ReadBytesBytes(b, nil)
|
|
return
|
|
|
|
case StrType:
|
|
i, o, err = ReadStringBytes(b)
|
|
return
|
|
|
|
default:
|
|
err = InvalidPrefixError(b[0])
|
|
return
|
|
}
|
|
}
|
|
|
|
// Skip skips the next object in 'b' and
|
|
// returns the remaining bytes. If the object
|
|
// is a map or array, all of its elements
|
|
// will be skipped.
|
|
// Possible Errors:
|
|
// - ErrShortBytes (not enough bytes in b)
|
|
// - InvalidPrefixError (bad encoding)
|
|
func Skip(b []byte) ([]byte, error) {
|
|
sz, asz, err := getSize(b)
|
|
if err != nil {
|
|
return b, err
|
|
}
|
|
if uintptr(len(b)) < sz {
|
|
return b, ErrShortBytes
|
|
}
|
|
b = b[sz:]
|
|
for asz > 0 {
|
|
b, err = Skip(b)
|
|
if err != nil {
|
|
return b, err
|
|
}
|
|
asz--
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
// returns (skip N bytes, skip M objects, error)
|
|
func getSize(b []byte) (uintptr, uintptr, error) {
|
|
l := len(b)
|
|
if l == 0 {
|
|
return 0, 0, ErrShortBytes
|
|
}
|
|
lead := b[0]
|
|
spec := &sizes[lead] // get type information
|
|
size, mode := spec.size, spec.extra
|
|
if size == 0 {
|
|
return 0, 0, InvalidPrefixError(lead)
|
|
}
|
|
if mode >= 0 { // fixed composites
|
|
return uintptr(size), uintptr(mode), nil
|
|
}
|
|
if l < int(size) {
|
|
return 0, 0, ErrShortBytes
|
|
}
|
|
switch mode {
|
|
case extra8:
|
|
return uintptr(size) + uintptr(b[1]), 0, nil
|
|
case extra16:
|
|
return uintptr(size) + uintptr(big.Uint16(b[1:])), 0, nil
|
|
case extra32:
|
|
return uintptr(size) + uintptr(big.Uint32(b[1:])), 0, nil
|
|
case map16v:
|
|
return uintptr(size), 2 * uintptr(big.Uint16(b[1:])), nil
|
|
case map32v:
|
|
return uintptr(size), 2 * uintptr(big.Uint32(b[1:])), nil
|
|
case array16v:
|
|
return uintptr(size), uintptr(big.Uint16(b[1:])), nil
|
|
case array32v:
|
|
return uintptr(size), uintptr(big.Uint32(b[1:])), nil
|
|
default:
|
|
return 0, 0, fatal
|
|
}
|
|
}
|
|
|