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blob.go
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/
blob.go
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ql
import (
"bytes"
"encoding/gob"
"log"
"math/big"
"sync"
"time"
)
const shortBlob = 256 // bytes
var (
gobInitDuration = time.Duration(278)
gobInitInt = big.NewInt(42)
gobInitRat = big.NewRat(355, 113)
gobInitTime time.Time
)
func init() {
var err error
if gobInitTime, err = time.ParseInLocation(
"Jan 2, 2006 at 3:04pm (MST)",
"Jul 9, 2012 at 5:02am (CEST)",
time.FixedZone("XYZ", 1234),
); err != nil {
log.Panic(err)
}
}
type gobCoder struct {
buf bytes.Buffer
dec *gob.Decoder
enc *gob.Encoder
mu sync.Mutex
}
func newGobCoder() (g *gobCoder) {
g = &gobCoder{}
g.enc = gob.NewEncoder(&g.buf)
if err := g.enc.Encode(gobInitInt); err != nil {
log.Panic(err)
}
if err := g.enc.Encode(gobInitRat); err != nil {
log.Panic(err)
}
if err := g.enc.Encode(gobInitTime); err != nil {
log.Panic(err)
}
if err := g.enc.Encode(gobInitDuration); err != nil {
log.Panic(err)
}
g.dec = gob.NewDecoder(&g.buf)
i := big.NewInt(0)
if err := g.dec.Decode(i); err != nil {
log.Panic(err)
}
r := big.NewRat(3, 5)
if err := g.dec.Decode(r); err != nil {
log.Panic(err)
}
t := time.Now()
if err := g.dec.Decode(&t); err != nil {
log.Panic(err)
}
var d time.Duration
if err := g.dec.Decode(&d); err != nil {
log.Panic(err)
}
return
}
func (g *gobCoder) encode(v interface{}) (b []byte, err error) {
g.mu.Lock()
defer g.mu.Unlock()
g.buf.Reset()
switch x := v.(type) {
case []byte:
return x, nil
case *big.Int:
err = g.enc.Encode(x)
case *big.Rat:
err = g.enc.Encode(x)
case time.Time:
err = g.enc.Encode(x)
case time.Duration:
err = g.enc.Encode(int64(x))
default:
//dbg("%T(%v)", v, v)
log.Panic("internal error 002")
}
b = g.buf.Bytes()
return
}
func (g *gobCoder) decode(b []byte, typ int) (v interface{}, err error) {
g.mu.Lock()
defer g.mu.Unlock()
g.buf.Reset()
g.buf.Write(b)
switch typ {
case qBlob:
return b, nil
case qBigInt:
x := big.NewInt(0)
err = g.dec.Decode(&x)
v = x
case qBigRat:
x := big.NewRat(1, 1)
err = g.dec.Decode(&x)
v = x
case qTime:
var x time.Time
err = g.dec.Decode(&x)
v = x
case qDuration:
var x int64
err = g.dec.Decode(&x)
v = time.Duration(x)
default:
log.Panic("internal error 003")
}
return
}