Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

1 files changed, 852 insertions, 0 deletions

diff --git a/vendor/github.com/ugorji/go/codec/msgpack.go b/vendor/github.com/ugorji/go/codec/msgpack.go
new file mode 100644
index 000000000..e09d5a04a
--- /dev/null
+++ b/vendor/github.com/ugorji/go/codec/msgpack.go
@@ -0,0 +1,852 @@
+// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a MIT license found in the LICENSE file.
+
+/*
+MSGPACK
+
+Msgpack-c implementation powers the c, c++, python, ruby, etc libraries.
+We need to maintain compatibility with it and how it encodes integer values
+without caring about the type.
+
+For compatibility with behaviour of msgpack-c reference implementation:
+  - Go intX (>0) and uintX
+       IS ENCODED AS
+    msgpack +ve fixnum, unsigned
+  - Go intX (<0)
+       IS ENCODED AS
+    msgpack -ve fixnum, signed
+
+*/
+package codec
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"net/rpc"
+	"reflect"
+)
+
+const (
+	mpPosFixNumMin byte = 0x00
+	mpPosFixNumMax      = 0x7f
+	mpFixMapMin         = 0x80
+	mpFixMapMax         = 0x8f
+	mpFixArrayMin       = 0x90
+	mpFixArrayMax       = 0x9f
+	mpFixStrMin         = 0xa0
+	mpFixStrMax         = 0xbf
+	mpNil               = 0xc0
+	_                   = 0xc1
+	mpFalse             = 0xc2
+	mpTrue              = 0xc3
+	mpFloat             = 0xca
+	mpDouble            = 0xcb
+	mpUint8             = 0xcc
+	mpUint16            = 0xcd
+	mpUint32            = 0xce
+	mpUint64            = 0xcf
+	mpInt8              = 0xd0
+	mpInt16             = 0xd1
+	mpInt32             = 0xd2
+	mpInt64             = 0xd3
+
+	// extensions below
+	mpBin8     = 0xc4
+	mpBin16    = 0xc5
+	mpBin32    = 0xc6
+	mpExt8     = 0xc7
+	mpExt16    = 0xc8
+	mpExt32    = 0xc9
+	mpFixExt1  = 0xd4
+	mpFixExt2  = 0xd5
+	mpFixExt4  = 0xd6
+	mpFixExt8  = 0xd7
+	mpFixExt16 = 0xd8
+
+	mpStr8  = 0xd9 // new
+	mpStr16 = 0xda
+	mpStr32 = 0xdb
+
+	mpArray16 = 0xdc
+	mpArray32 = 0xdd
+
+	mpMap16 = 0xde
+	mpMap32 = 0xdf
+
+	mpNegFixNumMin = 0xe0
+	mpNegFixNumMax = 0xff
+)
+
+// MsgpackSpecRpcMultiArgs is a special type which signifies to the MsgpackSpecRpcCodec
+// that the backend RPC service takes multiple arguments, which have been arranged
+// in sequence in the slice.
+//
+// The Codec then passes it AS-IS to the rpc service (without wrapping it in an
+// array of 1 element).
+type MsgpackSpecRpcMultiArgs []interface{}
+
+// A MsgpackContainer type specifies the different types of msgpackContainers.
+type msgpackContainerType struct {
+	fixCutoff                   int
+	bFixMin, b8, b16, b32       byte
+	hasFixMin, has8, has8Always bool
+}
+
+var (
+	msgpackContainerStr  = msgpackContainerType{32, mpFixStrMin, mpStr8, mpStr16, mpStr32, true, true, false}
+	msgpackContainerBin  = msgpackContainerType{0, 0, mpBin8, mpBin16, mpBin32, false, true, true}
+	msgpackContainerList = msgpackContainerType{16, mpFixArrayMin, 0, mpArray16, mpArray32, true, false, false}
+	msgpackContainerMap  = msgpackContainerType{16, mpFixMapMin, 0, mpMap16, mpMap32, true, false, false}
+)
+
+//---------------------------------------------
+
+type msgpackEncDriver struct {
+	noBuiltInTypes
+	encNoSeparator
+	e *Encoder
+	w encWriter
+	h *MsgpackHandle
+	x [8]byte
+}
+
+func (e *msgpackEncDriver) EncodeNil() {
+	e.w.writen1(mpNil)
+}
+
+func (e *msgpackEncDriver) EncodeInt(i int64) {
+	if i >= 0 {
+		e.EncodeUint(uint64(i))
+	} else if i >= -32 {
+		e.w.writen1(byte(i))
+	} else if i >= math.MinInt8 {
+		e.w.writen2(mpInt8, byte(i))
+	} else if i >= math.MinInt16 {
+		e.w.writen1(mpInt16)
+		bigenHelper{e.x[:2], e.w}.writeUint16(uint16(i))
+	} else if i >= math.MinInt32 {
+		e.w.writen1(mpInt32)
+		bigenHelper{e.x[:4], e.w}.writeUint32(uint32(i))
+	} else {
+		e.w.writen1(mpInt64)
+		bigenHelper{e.x[:8], e.w}.writeUint64(uint64(i))
+	}
+}
+
+func (e *msgpackEncDriver) EncodeUint(i uint64) {
+	if i <= math.MaxInt8 {
+		e.w.writen1(byte(i))
+	} else if i <= math.MaxUint8 {
+		e.w.writen2(mpUint8, byte(i))
+	} else if i <= math.MaxUint16 {
+		e.w.writen1(mpUint16)
+		bigenHelper{e.x[:2], e.w}.writeUint16(uint16(i))
+	} else if i <= math.MaxUint32 {
+		e.w.writen1(mpUint32)
+		bigenHelper{e.x[:4], e.w}.writeUint32(uint32(i))
+	} else {
+		e.w.writen1(mpUint64)
+		bigenHelper{e.x[:8], e.w}.writeUint64(uint64(i))
+	}
+}
+
+func (e *msgpackEncDriver) EncodeBool(b bool) {
+	if b {
+		e.w.writen1(mpTrue)
+	} else {
+		e.w.writen1(mpFalse)
+	}
+}
+
+func (e *msgpackEncDriver) EncodeFloat32(f float32) {
+	e.w.writen1(mpFloat)
+	bigenHelper{e.x[:4], e.w}.writeUint32(math.Float32bits(f))
+}
+
+func (e *msgpackEncDriver) EncodeFloat64(f float64) {
+	e.w.writen1(mpDouble)
+	bigenHelper{e.x[:8], e.w}.writeUint64(math.Float64bits(f))
+}
+
+func (e *msgpackEncDriver) EncodeExt(v interface{}, xtag uint64, ext Ext, _ *Encoder) {
+	bs := ext.WriteExt(v)
+	if bs == nil {
+		e.EncodeNil()
+		return
+	}
+	if e.h.WriteExt {
+		e.encodeExtPreamble(uint8(xtag), len(bs))
+		e.w.writeb(bs)
+	} else {
+		e.EncodeStringBytes(c_RAW, bs)
+	}
+}
+
+func (e *msgpackEncDriver) EncodeRawExt(re *RawExt, _ *Encoder) {
+	e.encodeExtPreamble(uint8(re.Tag), len(re.Data))
+	e.w.writeb(re.Data)
+}
+
+func (e *msgpackEncDriver) encodeExtPreamble(xtag byte, l int) {
+	if l == 1 {
+		e.w.writen2(mpFixExt1, xtag)
+	} else if l == 2 {
+		e.w.writen2(mpFixExt2, xtag)
+	} else if l == 4 {
+		e.w.writen2(mpFixExt4, xtag)
+	} else if l == 8 {
+		e.w.writen2(mpFixExt8, xtag)
+	} else if l == 16 {
+		e.w.writen2(mpFixExt16, xtag)
+	} else if l < 256 {
+		e.w.writen2(mpExt8, byte(l))
+		e.w.writen1(xtag)
+	} else if l < 65536 {
+		e.w.writen1(mpExt16)
+		bigenHelper{e.x[:2], e.w}.writeUint16(uint16(l))
+		e.w.writen1(xtag)
+	} else {
+		e.w.writen1(mpExt32)
+		bigenHelper{e.x[:4], e.w}.writeUint32(uint32(l))
+		e.w.writen1(xtag)
+	}
+}
+
+func (e *msgpackEncDriver) EncodeArrayStart(length int) {
+	e.writeContainerLen(msgpackContainerList, length)
+}
+
+func (e *msgpackEncDriver) EncodeMapStart(length int) {
+	e.writeContainerLen(msgpackContainerMap, length)
+}
+
+func (e *msgpackEncDriver) EncodeString(c charEncoding, s string) {
+	if c == c_RAW && e.h.WriteExt {
+		e.writeContainerLen(msgpackContainerBin, len(s))
+	} else {
+		e.writeContainerLen(msgpackContainerStr, len(s))
+	}
+	if len(s) > 0 {
+		e.w.writestr(s)
+	}
+}
+
+func (e *msgpackEncDriver) EncodeSymbol(v string) {
+	e.EncodeString(c_UTF8, v)
+}
+
+func (e *msgpackEncDriver) EncodeStringBytes(c charEncoding, bs []byte) {
+	if c == c_RAW && e.h.WriteExt {
+		e.writeContainerLen(msgpackContainerBin, len(bs))
+	} else {
+		e.writeContainerLen(msgpackContainerStr, len(bs))
+	}
+	if len(bs) > 0 {
+		e.w.writeb(bs)
+	}
+}
+
+func (e *msgpackEncDriver) writeContainerLen(ct msgpackContainerType, l int) {
+	if ct.hasFixMin && l < ct.fixCutoff {
+		e.w.writen1(ct.bFixMin | byte(l))
+	} else if ct.has8 && l < 256 && (ct.has8Always || e.h.WriteExt) {
+		e.w.writen2(ct.b8, uint8(l))
+	} else if l < 65536 {
+		e.w.writen1(ct.b16)
+		bigenHelper{e.x[:2], e.w}.writeUint16(uint16(l))
+	} else {
+		e.w.writen1(ct.b32)
+		bigenHelper{e.x[:4], e.w}.writeUint32(uint32(l))
+	}
+}
+
+//---------------------------------------------
+
+type msgpackDecDriver struct {
+	d      *Decoder
+	r      decReader // *Decoder decReader decReaderT
+	h      *MsgpackHandle
+	b      [scratchByteArrayLen]byte
+	bd     byte
+	bdRead bool
+	br     bool // bytes reader
+	noBuiltInTypes
+	noStreamingCodec
+	decNoSeparator
+}
+
+// Note: This returns either a primitive (int, bool, etc) for non-containers,
+// or a containerType, or a specific type denoting nil or extension.
+// It is called when a nil interface{} is passed, leaving it up to the DecDriver
+// to introspect the stream and decide how best to decode.
+// It deciphers the value by looking at the stream first.
+func (d *msgpackDecDriver) DecodeNaked() {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	bd := d.bd
+	n := &d.d.n
+	var decodeFurther bool
+
+	switch bd {
+	case mpNil:
+		n.v = valueTypeNil
+		d.bdRead = false
+	case mpFalse:
+		n.v = valueTypeBool
+		n.b = false
+	case mpTrue:
+		n.v = valueTypeBool
+		n.b = true
+
+	case mpFloat:
+		n.v = valueTypeFloat
+		n.f = float64(math.Float32frombits(bigen.Uint32(d.r.readx(4))))
+	case mpDouble:
+		n.v = valueTypeFloat
+		n.f = math.Float64frombits(bigen.Uint64(d.r.readx(8)))
+
+	case mpUint8:
+		n.v = valueTypeUint
+		n.u = uint64(d.r.readn1())
+	case mpUint16:
+		n.v = valueTypeUint
+		n.u = uint64(bigen.Uint16(d.r.readx(2)))
+	case mpUint32:
+		n.v = valueTypeUint
+		n.u = uint64(bigen.Uint32(d.r.readx(4)))
+	case mpUint64:
+		n.v = valueTypeUint
+		n.u = uint64(bigen.Uint64(d.r.readx(8)))
+
+	case mpInt8:
+		n.v = valueTypeInt
+		n.i = int64(int8(d.r.readn1()))
+	case mpInt16:
+		n.v = valueTypeInt
+		n.i = int64(int16(bigen.Uint16(d.r.readx(2))))
+	case mpInt32:
+		n.v = valueTypeInt
+		n.i = int64(int32(bigen.Uint32(d.r.readx(4))))
+	case mpInt64:
+		n.v = valueTypeInt
+		n.i = int64(int64(bigen.Uint64(d.r.readx(8))))
+
+	default:
+		switch {
+		case bd >= mpPosFixNumMin && bd <= mpPosFixNumMax:
+			// positive fixnum (always signed)
+			n.v = valueTypeInt
+			n.i = int64(int8(bd))
+		case bd >= mpNegFixNumMin && bd <= mpNegFixNumMax:
+			// negative fixnum
+			n.v = valueTypeInt
+			n.i = int64(int8(bd))
+		case bd == mpStr8, bd == mpStr16, bd == mpStr32, bd >= mpFixStrMin && bd <= mpFixStrMax:
+			if d.h.RawToString {
+				n.v = valueTypeString
+				n.s = d.DecodeString()
+			} else {
+				n.v = valueTypeBytes
+				n.l = d.DecodeBytes(nil, false, false)
+			}
+		case bd == mpBin8, bd == mpBin16, bd == mpBin32:
+			n.v = valueTypeBytes
+			n.l = d.DecodeBytes(nil, false, false)
+		case bd == mpArray16, bd == mpArray32, bd >= mpFixArrayMin && bd <= mpFixArrayMax:
+			n.v = valueTypeArray
+			decodeFurther = true
+		case bd == mpMap16, bd == mpMap32, bd >= mpFixMapMin && bd <= mpFixMapMax:
+			n.v = valueTypeMap
+			decodeFurther = true
+		case bd >= mpFixExt1 && bd <= mpFixExt16, bd >= mpExt8 && bd <= mpExt32:
+			n.v = valueTypeExt
+			clen := d.readExtLen()
+			n.u = uint64(d.r.readn1())
+			n.l = d.r.readx(clen)
+		default:
+			d.d.errorf("Nil-Deciphered DecodeValue: %s: hex: %x, dec: %d", msgBadDesc, bd, bd)
+		}
+	}
+	if !decodeFurther {
+		d.bdRead = false
+	}
+	if n.v == valueTypeUint && d.h.SignedInteger {
+		n.v = valueTypeInt
+		n.i = int64(n.u)
+	}
+	return
+}
+
+// int can be decoded from msgpack type: intXXX or uintXXX
+func (d *msgpackDecDriver) DecodeInt(bitsize uint8) (i int64) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	switch d.bd {
+	case mpUint8:
+		i = int64(uint64(d.r.readn1()))
+	case mpUint16:
+		i = int64(uint64(bigen.Uint16(d.r.readx(2))))
+	case mpUint32:
+		i = int64(uint64(bigen.Uint32(d.r.readx(4))))
+	case mpUint64:
+		i = int64(bigen.Uint64(d.r.readx(8)))
+	case mpInt8:
+		i = int64(int8(d.r.readn1()))
+	case mpInt16:
+		i = int64(int16(bigen.Uint16(d.r.readx(2))))
+	case mpInt32:
+		i = int64(int32(bigen.Uint32(d.r.readx(4))))
+	case mpInt64:
+		i = int64(bigen.Uint64(d.r.readx(8)))
+	default:
+		switch {
+		case d.bd >= mpPosFixNumMin && d.bd <= mpPosFixNumMax:
+			i = int64(int8(d.bd))
+		case d.bd >= mpNegFixNumMin && d.bd <= mpNegFixNumMax:
+			i = int64(int8(d.bd))
+		default:
+			d.d.errorf("Unhandled single-byte unsigned integer value: %s: %x", msgBadDesc, d.bd)
+			return
+		}
+	}
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowUint()
+	if bitsize > 0 {
+		if trunc := (i << (64 - bitsize)) >> (64 - bitsize); i != trunc {
+			d.d.errorf("Overflow int value: %v", i)
+			return
+		}
+	}
+	d.bdRead = false
+	return
+}
+
+// uint can be decoded from msgpack type: intXXX or uintXXX
+func (d *msgpackDecDriver) DecodeUint(bitsize uint8) (ui uint64) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	switch d.bd {
+	case mpUint8:
+		ui = uint64(d.r.readn1())
+	case mpUint16:
+		ui = uint64(bigen.Uint16(d.r.readx(2)))
+	case mpUint32:
+		ui = uint64(bigen.Uint32(d.r.readx(4)))
+	case mpUint64:
+		ui = bigen.Uint64(d.r.readx(8))
+	case mpInt8:
+		if i := int64(int8(d.r.readn1())); i >= 0 {
+			ui = uint64(i)
+		} else {
+			d.d.errorf("Assigning negative signed value: %v, to unsigned type", i)
+			return
+		}
+	case mpInt16:
+		if i := int64(int16(bigen.Uint16(d.r.readx(2)))); i >= 0 {
+			ui = uint64(i)
+		} else {
+			d.d.errorf("Assigning negative signed value: %v, to unsigned type", i)
+			return
+		}
+	case mpInt32:
+		if i := int64(int32(bigen.Uint32(d.r.readx(4)))); i >= 0 {
+			ui = uint64(i)
+		} else {
+			d.d.errorf("Assigning negative signed value: %v, to unsigned type", i)
+			return
+		}
+	case mpInt64:
+		if i := int64(bigen.Uint64(d.r.readx(8))); i >= 0 {
+			ui = uint64(i)
+		} else {
+			d.d.errorf("Assigning negative signed value: %v, to unsigned type", i)
+			return
+		}
+	default:
+		switch {
+		case d.bd >= mpPosFixNumMin && d.bd <= mpPosFixNumMax:
+			ui = uint64(d.bd)
+		case d.bd >= mpNegFixNumMin && d.bd <= mpNegFixNumMax:
+			d.d.errorf("Assigning negative signed value: %v, to unsigned type", int(d.bd))
+			return
+		default:
+			d.d.errorf("Unhandled single-byte unsigned integer value: %s: %x", msgBadDesc, d.bd)
+			return
+		}
+	}
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowUint()
+	if bitsize > 0 {
+		if trunc := (ui << (64 - bitsize)) >> (64 - bitsize); ui != trunc {
+			d.d.errorf("Overflow uint value: %v", ui)
+			return
+		}
+	}
+	d.bdRead = false
+	return
+}
+
+// float can either be decoded from msgpack type: float, double or intX
+func (d *msgpackDecDriver) DecodeFloat(chkOverflow32 bool) (f float64) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	if d.bd == mpFloat {
+		f = float64(math.Float32frombits(bigen.Uint32(d.r.readx(4))))
+	} else if d.bd == mpDouble {
+		f = math.Float64frombits(bigen.Uint64(d.r.readx(8)))
+	} else {
+		f = float64(d.DecodeInt(0))
+	}
+	if chkOverflow32 && chkOvf.Float32(f) {
+		d.d.errorf("msgpack: float32 overflow: %v", f)
+		return
+	}
+	d.bdRead = false
+	return
+}
+
+// bool can be decoded from bool, fixnum 0 or 1.
+func (d *msgpackDecDriver) DecodeBool() (b bool) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	if d.bd == mpFalse || d.bd == 0 {
+		// b = false
+	} else if d.bd == mpTrue || d.bd == 1 {
+		b = true
+	} else {
+		d.d.errorf("Invalid single-byte value for bool: %s: %x", msgBadDesc, d.bd)
+		return
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *msgpackDecDriver) DecodeBytes(bs []byte, isstring, zerocopy bool) (bsOut []byte) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	var clen int
+	// ignore isstring. Expect that the bytes may be found from msgpackContainerStr or msgpackContainerBin
+	if bd := d.bd; bd == mpBin8 || bd == mpBin16 || bd == mpBin32 {
+		clen = d.readContainerLen(msgpackContainerBin)
+	} else {
+		clen = d.readContainerLen(msgpackContainerStr)
+	}
+	// println("DecodeBytes: clen: ", clen)
+	d.bdRead = false
+	// bytes may be nil, so handle it. if nil, clen=-1.
+	if clen < 0 {
+		return nil
+	}
+	if zerocopy {
+		if d.br {
+			return d.r.readx(clen)
+		} else if len(bs) == 0 {
+			bs = d.b[:]
+		}
+	}
+	return decByteSlice(d.r, clen, d.d.h.MaxInitLen, bs)
+}
+
+func (d *msgpackDecDriver) DecodeString() (s string) {
+	return string(d.DecodeBytes(d.b[:], true, true))
+}
+
+func (d *msgpackDecDriver) readNextBd() {
+	d.bd = d.r.readn1()
+	d.bdRead = true
+}
+
+func (d *msgpackDecDriver) uncacheRead() {
+	if d.bdRead {
+		d.r.unreadn1()
+		d.bdRead = false
+	}
+}
+
+func (d *msgpackDecDriver) ContainerType() (vt valueType) {
+	bd := d.bd
+	if bd == mpNil {
+		return valueTypeNil
+	} else if bd == mpBin8 || bd == mpBin16 || bd == mpBin32 ||
+		(!d.h.RawToString &&
+			(bd == mpStr8 || bd == mpStr16 || bd == mpStr32 || (bd >= mpFixStrMin && bd <= mpFixStrMax))) {
+		return valueTypeBytes
+	} else if d.h.RawToString &&
+		(bd == mpStr8 || bd == mpStr16 || bd == mpStr32 || (bd >= mpFixStrMin && bd <= mpFixStrMax)) {
+		return valueTypeString
+	} else if bd == mpArray16 || bd == mpArray32 || (bd >= mpFixArrayMin && bd <= mpFixArrayMax) {
+		return valueTypeArray
+	} else if bd == mpMap16 || bd == mpMap32 || (bd >= mpFixMapMin && bd <= mpFixMapMax) {
+		return valueTypeMap
+	} else {
+		// d.d.errorf("isContainerType: unsupported parameter: %v", vt)
+	}
+	return valueTypeUnset
+}
+
+func (d *msgpackDecDriver) TryDecodeAsNil() (v bool) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	if d.bd == mpNil {
+		d.bdRead = false
+		v = true
+	}
+	return
+}
+
+func (d *msgpackDecDriver) readContainerLen(ct msgpackContainerType) (clen int) {
+	bd := d.bd
+	if bd == mpNil {
+		clen = -1 // to represent nil
+	} else if bd == ct.b8 {
+		clen = int(d.r.readn1())
+	} else if bd == ct.b16 {
+		clen = int(bigen.Uint16(d.r.readx(2)))
+	} else if bd == ct.b32 {
+		clen = int(bigen.Uint32(d.r.readx(4)))
+	} else if (ct.bFixMin & bd) == ct.bFixMin {
+		clen = int(ct.bFixMin ^ bd)
+	} else {
+		d.d.errorf("readContainerLen: %s: hex: %x, decimal: %d", msgBadDesc, bd, bd)
+		return
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *msgpackDecDriver) ReadMapStart() int {
+	return d.readContainerLen(msgpackContainerMap)
+}
+
+func (d *msgpackDecDriver) ReadArrayStart() int {
+	return d.readContainerLen(msgpackContainerList)
+}
+
+func (d *msgpackDecDriver) readExtLen() (clen int) {
+	switch d.bd {
+	case mpNil:
+		clen = -1 // to represent nil
+	case mpFixExt1:
+		clen = 1
+	case mpFixExt2:
+		clen = 2
+	case mpFixExt4:
+		clen = 4
+	case mpFixExt8:
+		clen = 8
+	case mpFixExt16:
+		clen = 16
+	case mpExt8:
+		clen = int(d.r.readn1())
+	case mpExt16:
+		clen = int(bigen.Uint16(d.r.readx(2)))
+	case mpExt32:
+		clen = int(bigen.Uint32(d.r.readx(4)))
+	default:
+		d.d.errorf("decoding ext bytes: found unexpected byte: %x", d.bd)
+		return
+	}
+	return
+}
+
+func (d *msgpackDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
+	if xtag > 0xff {
+		d.d.errorf("decodeExt: tag must be <= 0xff; got: %v", xtag)
+		return
+	}
+	realxtag1, xbs := d.decodeExtV(ext != nil, uint8(xtag))
+	realxtag = uint64(realxtag1)
+	if ext == nil {
+		re := rv.(*RawExt)
+		re.Tag = realxtag
+		re.Data = detachZeroCopyBytes(d.br, re.Data, xbs)
+	} else {
+		ext.ReadExt(rv, xbs)
+	}
+	return
+}
+
+func (d *msgpackDecDriver) decodeExtV(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
+	if !d.bdRead {
+		d.readNextBd()
+	}
+	xbd := d.bd
+	if xbd == mpBin8 || xbd == mpBin16 || xbd == mpBin32 {
+		xbs = d.DecodeBytes(nil, false, true)
+	} else if xbd == mpStr8 || xbd == mpStr16 || xbd == mpStr32 ||
+		(xbd >= mpFixStrMin && xbd <= mpFixStrMax) {
+		xbs = d.DecodeBytes(nil, true, true)
+	} else {
+		clen := d.readExtLen()
+		xtag = d.r.readn1()
+		if verifyTag && xtag != tag {
+			d.d.errorf("Wrong extension tag. Got %b. Expecting: %v", xtag, tag)
+			return
+		}
+		xbs = d.r.readx(clen)
+	}
+	d.bdRead = false
+	return
+}
+
+//--------------------------------------------------
+
+//MsgpackHandle is a Handle for the Msgpack Schema-Free Encoding Format.
+type MsgpackHandle struct {
+	BasicHandle
+
+	// RawToString controls how raw bytes are decoded into a nil interface{}.
+	RawToString bool
+
+	// WriteExt flag supports encoding configured extensions with extension tags.
+	// It also controls whether other elements of the new spec are encoded (ie Str8).
+	//
+	// With WriteExt=false, configured extensions are serialized as raw bytes
+	// and Str8 is not encoded.
+	//
+	// A stream can still be decoded into a typed value, provided an appropriate value
+	// is provided, but the type cannot be inferred from the stream. If no appropriate
+	// type is provided (e.g. decoding into a nil interface{}), you get back
+	// a []byte or string based on the setting of RawToString.
+	WriteExt bool
+	binaryEncodingType
+}
+
+func (h *MsgpackHandle) SetBytesExt(rt reflect.Type, tag uint64, ext BytesExt) (err error) {
+	return h.SetExt(rt, tag, &setExtWrapper{b: ext})
+}
+
+func (h *MsgpackHandle) newEncDriver(e *Encoder) encDriver {
+	return &msgpackEncDriver{e: e, w: e.w, h: h}
+}
+
+func (h *MsgpackHandle) newDecDriver(d *Decoder) decDriver {
+	return &msgpackDecDriver{d: d, r: d.r, h: h, br: d.bytes}
+}
+
+func (e *msgpackEncDriver) reset() {
+	e.w = e.e.w
+}
+
+func (d *msgpackDecDriver) reset() {
+	d.r = d.d.r
+	d.bd, d.bdRead = 0, false
+}
+
+//--------------------------------------------------
+
+type msgpackSpecRpcCodec struct {
+	rpcCodec
+}
+
+// /////////////// Spec RPC Codec ///////////////////
+func (c *msgpackSpecRpcCodec) WriteRequest(r *rpc.Request, body interface{}) error {
+	// WriteRequest can write to both a Go service, and other services that do
+	// not abide by the 1 argument rule of a Go service.
+	// We discriminate based on if the body is a MsgpackSpecRpcMultiArgs
+	var bodyArr []interface{}
+	if m, ok := body.(MsgpackSpecRpcMultiArgs); ok {
+		bodyArr = ([]interface{})(m)
+	} else {
+		bodyArr = []interface{}{body}
+	}
+	r2 := []interface{}{0, uint32(r.Seq), r.ServiceMethod, bodyArr}
+	return c.write(r2, nil, false, true)
+}
+
+func (c *msgpackSpecRpcCodec) WriteResponse(r *rpc.Response, body interface{}) error {
+	var moe interface{}
+	if r.Error != "" {
+		moe = r.Error
+	}
+	if moe != nil && body != nil {
+		body = nil
+	}
+	r2 := []interface{}{1, uint32(r.Seq), moe, body}
+	return c.write(r2, nil, false, true)
+}
+
+func (c *msgpackSpecRpcCodec) ReadResponseHeader(r *rpc.Response) error {
+	return c.parseCustomHeader(1, &r.Seq, &r.Error)
+}
+
+func (c *msgpackSpecRpcCodec) ReadRequestHeader(r *rpc.Request) error {
+	return c.parseCustomHeader(0, &r.Seq, &r.ServiceMethod)
+}
+
+func (c *msgpackSpecRpcCodec) ReadRequestBody(body interface{}) error {
+	if body == nil { // read and discard
+		return c.read(nil)
+	}
+	bodyArr := []interface{}{body}
+	return c.read(&bodyArr)
+}
+
+func (c *msgpackSpecRpcCodec) parseCustomHeader(expectTypeByte byte, msgid *uint64, methodOrError *string) (err error) {
+
+	if c.isClosed() {
+		return io.EOF
+	}
+
+	// We read the response header by hand
+	// so that the body can be decoded on its own from the stream at a later time.
+
+	const fia byte = 0x94 //four item array descriptor value
+	// Not sure why the panic of EOF is swallowed above.
+	// if bs1 := c.dec.r.readn1(); bs1 != fia {
+	// 	err = fmt.Errorf("Unexpected value for array descriptor: Expecting %v. Received %v", fia, bs1)
+	// 	return
+	// }
+	var b byte
+	b, err = c.br.ReadByte()
+	if err != nil {
+		return
+	}
+	if b != fia {
+		err = fmt.Errorf("Unexpected value for array descriptor: Expecting %v. Received %v", fia, b)
+		return
+	}
+
+	if err = c.read(&b); err != nil {
+		return
+	}
+	if b != expectTypeByte {
+		err = fmt.Errorf("Unexpected byte descriptor in header. Expecting %v. Received %v", expectTypeByte, b)
+		return
+	}
+	if err = c.read(msgid); err != nil {
+		return
+	}
+	if err = c.read(methodOrError); err != nil {
+		return
+	}
+	return
+}
+
+//--------------------------------------------------
+
+// msgpackSpecRpc is the implementation of Rpc that uses custom communication protocol
+// as defined in the msgpack spec at https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md
+type msgpackSpecRpc struct{}
+
+// MsgpackSpecRpc implements Rpc using the communication protocol defined in
+// the msgpack spec at https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md .
+// Its methods (ServerCodec and ClientCodec) return values that implement RpcCodecBuffered.
+var MsgpackSpecRpc msgpackSpecRpc
+
+func (x msgpackSpecRpc) ServerCodec(conn io.ReadWriteCloser, h Handle) rpc.ServerCodec {
+	return &msgpackSpecRpcCodec{newRPCCodec(conn, h)}
+}
+
+func (x msgpackSpecRpc) ClientCodec(conn io.ReadWriteCloser, h Handle) rpc.ClientCodec {
+	return &msgpackSpecRpcCodec{newRPCCodec(conn, h)}
+}
+
+var _ decDriver = (*msgpackDecDriver)(nil)
+var _ encDriver = (*msgpackEncDriver)(nil)