214 lines
6.5 KiB
Go
214 lines
6.5 KiB
Go
// 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.
|
|
|
|
package codec
|
|
|
|
import (
|
|
"math/rand"
|
|
"time"
|
|
)
|
|
|
|
// NoopHandle returns a no-op handle. It basically does nothing.
|
|
// It is only useful for benchmarking, as it gives an idea of the
|
|
// overhead from the codec framework.
|
|
//
|
|
// LIBRARY USERS: *** DO NOT USE ***
|
|
func NoopHandle(slen int) *noopHandle {
|
|
h := noopHandle{}
|
|
h.rand = rand.New(rand.NewSource(time.Now().UnixNano()))
|
|
h.B = make([][]byte, slen)
|
|
h.S = make([]string, slen)
|
|
for i := 0; i < len(h.S); i++ {
|
|
b := make([]byte, i+1)
|
|
for j := 0; j < len(b); j++ {
|
|
b[j] = 'a' + byte(i)
|
|
}
|
|
h.B[i] = b
|
|
h.S[i] = string(b)
|
|
}
|
|
return &h
|
|
}
|
|
|
|
// noopHandle does nothing.
|
|
// It is used to simulate the overhead of the codec framework.
|
|
type noopHandle struct {
|
|
BasicHandle
|
|
binaryEncodingType
|
|
noopDrv // noopDrv is unexported here, so we can get a copy of it when needed.
|
|
}
|
|
|
|
type noopDrv struct {
|
|
d *Decoder
|
|
e *Encoder
|
|
i int
|
|
S []string
|
|
B [][]byte
|
|
mks []bool // stack. if map (true), else if array (false)
|
|
mk bool // top of stack. what container are we on? map or array?
|
|
ct valueType // last response for IsContainerType.
|
|
cb int // counter for ContainerType
|
|
rand *rand.Rand
|
|
}
|
|
|
|
func (h *noopDrv) r(v int) int { return h.rand.Intn(v) }
|
|
func (h *noopDrv) m(v int) int { h.i++; return h.i % v }
|
|
|
|
func (h *noopDrv) newEncDriver(e *Encoder) encDriver { h.e = e; return h }
|
|
func (h *noopDrv) newDecDriver(d *Decoder) decDriver { h.d = d; return h }
|
|
|
|
func (h *noopDrv) reset() {}
|
|
func (h *noopDrv) uncacheRead() {}
|
|
|
|
// --- encDriver
|
|
|
|
// stack functions (for map and array)
|
|
func (h *noopDrv) start(b bool) {
|
|
// println("start", len(h.mks)+1)
|
|
h.mks = append(h.mks, b)
|
|
h.mk = b
|
|
}
|
|
func (h *noopDrv) end() {
|
|
// println("end: ", len(h.mks)-1)
|
|
h.mks = h.mks[:len(h.mks)-1]
|
|
if len(h.mks) > 0 {
|
|
h.mk = h.mks[len(h.mks)-1]
|
|
} else {
|
|
h.mk = false
|
|
}
|
|
}
|
|
|
|
func (h *noopDrv) EncodeBuiltin(rt uintptr, v interface{}) {}
|
|
func (h *noopDrv) EncodeNil() {}
|
|
func (h *noopDrv) EncodeInt(i int64) {}
|
|
func (h *noopDrv) EncodeUint(i uint64) {}
|
|
func (h *noopDrv) EncodeBool(b bool) {}
|
|
func (h *noopDrv) EncodeFloat32(f float32) {}
|
|
func (h *noopDrv) EncodeFloat64(f float64) {}
|
|
func (h *noopDrv) EncodeRawExt(re *RawExt, e *Encoder) {}
|
|
func (h *noopDrv) EncodeArrayStart(length int) { h.start(true) }
|
|
func (h *noopDrv) EncodeMapStart(length int) { h.start(false) }
|
|
func (h *noopDrv) EncodeEnd() { h.end() }
|
|
|
|
func (h *noopDrv) EncodeString(c charEncoding, v string) {}
|
|
func (h *noopDrv) EncodeSymbol(v string) {}
|
|
func (h *noopDrv) EncodeStringBytes(c charEncoding, v []byte) {}
|
|
|
|
func (h *noopDrv) EncodeExt(rv interface{}, xtag uint64, ext Ext, e *Encoder) {}
|
|
|
|
// ---- decDriver
|
|
func (h *noopDrv) initReadNext() {}
|
|
func (h *noopDrv) CheckBreak() bool { return false }
|
|
func (h *noopDrv) IsBuiltinType(rt uintptr) bool { return false }
|
|
func (h *noopDrv) DecodeBuiltin(rt uintptr, v interface{}) {}
|
|
func (h *noopDrv) DecodeInt(bitsize uint8) (i int64) { return int64(h.m(15)) }
|
|
func (h *noopDrv) DecodeUint(bitsize uint8) (ui uint64) { return uint64(h.m(35)) }
|
|
func (h *noopDrv) DecodeFloat(chkOverflow32 bool) (f float64) { return float64(h.m(95)) }
|
|
func (h *noopDrv) DecodeBool() (b bool) { return h.m(2) == 0 }
|
|
func (h *noopDrv) DecodeString() (s string) { return h.S[h.m(8)] }
|
|
|
|
// func (h *noopDrv) DecodeStringAsBytes(bs []byte) []byte { return h.DecodeBytes(bs) }
|
|
|
|
func (h *noopDrv) DecodeBytes(bs []byte, isstring, zerocopy bool) []byte { return h.B[h.m(len(h.B))] }
|
|
|
|
func (h *noopDrv) ReadEnd() { h.end() }
|
|
|
|
// toggle map/slice
|
|
func (h *noopDrv) ReadMapStart() int { h.start(true); return h.m(10) }
|
|
func (h *noopDrv) ReadArrayStart() int { h.start(false); return h.m(10) }
|
|
|
|
func (h *noopDrv) ContainerType() (vt valueType) {
|
|
// return h.m(2) == 0
|
|
// handle kStruct, which will bomb is it calls this and doesn't get back a map or array.
|
|
// consequently, if the return value is not map or array, reset it to one of them based on h.m(7) % 2
|
|
// for kstruct: at least one out of every 2 times, return one of valueTypeMap or Array (else kstruct bombs)
|
|
// however, every 10th time it is called, we just return something else.
|
|
var vals = [...]valueType{valueTypeArray, valueTypeMap}
|
|
// ------------ TAKE ------------
|
|
// if h.cb%2 == 0 {
|
|
// if h.ct == valueTypeMap || h.ct == valueTypeArray {
|
|
// } else {
|
|
// h.ct = vals[h.m(2)]
|
|
// }
|
|
// } else if h.cb%5 == 0 {
|
|
// h.ct = valueType(h.m(8))
|
|
// } else {
|
|
// h.ct = vals[h.m(2)]
|
|
// }
|
|
// ------------ TAKE ------------
|
|
// if h.cb%16 == 0 {
|
|
// h.ct = valueType(h.cb % 8)
|
|
// } else {
|
|
// h.ct = vals[h.cb%2]
|
|
// }
|
|
h.ct = vals[h.cb%2]
|
|
h.cb++
|
|
return h.ct
|
|
|
|
// if h.ct == valueTypeNil || h.ct == valueTypeString || h.ct == valueTypeBytes {
|
|
// return h.ct
|
|
// }
|
|
// return valueTypeUnset
|
|
// TODO: may need to tweak this so it works.
|
|
// if h.ct == valueTypeMap && vt == valueTypeArray || h.ct == valueTypeArray && vt == valueTypeMap {
|
|
// h.cb = !h.cb
|
|
// h.ct = vt
|
|
// return h.cb
|
|
// }
|
|
// // go in a loop and check it.
|
|
// h.ct = vt
|
|
// h.cb = h.m(7) == 0
|
|
// return h.cb
|
|
}
|
|
func (h *noopDrv) TryDecodeAsNil() bool {
|
|
if h.mk {
|
|
return false
|
|
} else {
|
|
return h.m(8) == 0
|
|
}
|
|
}
|
|
func (h *noopDrv) DecodeExt(rv interface{}, xtag uint64, ext Ext) uint64 {
|
|
return 0
|
|
}
|
|
|
|
func (h *noopDrv) DecodeNaked() {
|
|
// use h.r (random) not h.m() because h.m() could cause the same value to be given.
|
|
var sk int
|
|
if h.mk {
|
|
// if mapkey, do not support values of nil OR bytes, array, map or rawext
|
|
sk = h.r(7) + 1
|
|
} else {
|
|
sk = h.r(12)
|
|
}
|
|
n := &h.d.n
|
|
switch sk {
|
|
case 0:
|
|
n.v = valueTypeNil
|
|
case 1:
|
|
n.v, n.b = valueTypeBool, false
|
|
case 2:
|
|
n.v, n.b = valueTypeBool, true
|
|
case 3:
|
|
n.v, n.i = valueTypeInt, h.DecodeInt(64)
|
|
case 4:
|
|
n.v, n.u = valueTypeUint, h.DecodeUint(64)
|
|
case 5:
|
|
n.v, n.f = valueTypeFloat, h.DecodeFloat(true)
|
|
case 6:
|
|
n.v, n.f = valueTypeFloat, h.DecodeFloat(false)
|
|
case 7:
|
|
n.v, n.s = valueTypeString, h.DecodeString()
|
|
case 8:
|
|
n.v, n.l = valueTypeBytes, h.B[h.m(len(h.B))]
|
|
case 9:
|
|
n.v = valueTypeArray
|
|
case 10:
|
|
n.v = valueTypeMap
|
|
default:
|
|
n.v = valueTypeExt
|
|
n.u = h.DecodeUint(64)
|
|
n.l = h.B[h.m(len(h.B))]
|
|
}
|
|
h.ct = n.v
|
|
return
|
|
}
|