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encoder.go
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encoder.go
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// Copyright 2018 The margo 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 daq
import (
"encoding/binary"
"io"
"math"
)
type Encoder struct {
w io.Writer
err error
}
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w}
}
func (enc *Encoder) Err() error {
return enc.err
}
func (enc *Encoder) Write(p []byte) (int, error) {
if enc.err != nil {
return 0, enc.err
}
n, err := enc.w.Write(p)
enc.err = err
return n, err
}
func (enc *Encoder) WriteU8(v uint8) {
if enc.err != nil {
return
}
var buf = [1]byte{v}
_, enc.err = enc.w.Write(buf[:])
}
func (enc *Encoder) WriteU32(v uint32) {
if enc.err != nil {
return
}
var buf [4]byte
binary.LittleEndian.PutUint32(buf[:], v)
_, enc.err = enc.w.Write(buf[:])
}
func (enc *Encoder) WriteU64(v uint64) {
if enc.err != nil {
return
}
var buf [8]byte
binary.LittleEndian.PutUint64(buf[:], v)
_, enc.err = enc.w.Write(buf[:])
}
func (enc *Encoder) WriteF64(v float64) {
if enc.err != nil {
return
}
var buf [8]byte
binary.LittleEndian.PutUint64(buf[:], math.Float64bits(v))
_, enc.err = enc.w.Write(buf[:])
}
func (enc *Encoder) WriteStr(v string) {
if enc.err != nil {
return
}
enc.WriteU64(uint64(len(v)))
enc.Write([]byte(v))
}