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buffer_output.go
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buffer_output.go
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// Copyright 2022 Teamgram Authors
// All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: teamgramio (teamgram.io@gmail.com)
//
package utils
import (
"encoding/binary"
"math"
)
// TODO(@benqi): Add write offset data
type BufferOutput struct {
buf []byte
}
func NewBufferOutput(cap int) *BufferOutput {
return &BufferOutput{make([]byte, 0, cap)}
}
func (e *BufferOutput) Buf() []byte {
return e.buf
}
func (e *BufferOutput) Len() int {
return len(e.buf)
}
func (e *BufferOutput) Byte(s byte) {
e.buf = append(e.buf, s)
}
func (e *BufferOutput) Int16(s int16) {
e.buf = append(e.buf, 0, 0)
binary.LittleEndian.PutUint16(e.buf[len(e.buf)-2:], uint16(s))
}
func (e *BufferOutput) UInt16(s uint16) {
e.buf = append(e.buf, 0, 0)
binary.LittleEndian.PutUint16(e.buf[len(e.buf)-2:], s)
}
func (e *BufferOutput) Int32(s int32) {
e.buf = append(e.buf, 0, 0, 0, 0)
binary.LittleEndian.PutUint32(e.buf[len(e.buf)-4:], uint32(s))
}
func (e *BufferOutput) UInt32(s uint32) {
e.buf = append(e.buf, 0, 0, 0, 0)
binary.LittleEndian.PutUint32(e.buf[len(e.buf)-4:], s)
}
func (e *BufferOutput) Int64(s int64) {
e.buf = append(e.buf, 0, 0, 0, 0, 0, 0, 0, 0)
binary.LittleEndian.PutUint64(e.buf[len(e.buf)-8:], uint64(s))
}
func (e *BufferOutput) UInt64(s uint64) {
e.buf = append(e.buf, 0, 0, 0, 0, 0, 0, 0, 0)
binary.LittleEndian.PutUint64(e.buf[len(e.buf)-8:], s)
}
func (e *BufferOutput) Double(s float64) {
e.buf = append(e.buf, 0, 0, 0, 0, 0, 0, 0, 0)
binary.LittleEndian.PutUint64(e.buf[len(e.buf)-8:], math.Float64bits(s))
}
func (e *BufferOutput) Bytes(s []byte) {
e.buf = append(e.buf, s...)
}
func (e *BufferOutput) ByteSize() int {
return len(e.buf)
}