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// Copyright (c) 2020 Cisco and/or its affiliates.
//
// 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.
package codec
import (
"encoding/binary"
"math"
"reflect"
"unsafe"
)
var order = binary.BigEndian
type Buffer struct {
pos int
buf []byte
}
func (b *Buffer) Bytes() []byte {
return b.buf[:b.pos]
}
func (b *Buffer) EncodeBool(v bool) {
if v {
b.buf[b.pos] = 1
} else {
b.buf[b.pos] = 0
}
b.pos += 1
}
func (b *Buffer) EncodeUint8(v uint8) {
b.buf[b.pos] = v
b.pos += 1
}
func (b *Buffer) EncodeUint16(v uint16) {
order.PutUint16(b.buf[b.pos:b.pos+2], v)
b.pos += 2
}
func (b *Buffer) EncodeUint32(v uint32) {
order.PutUint32(b.buf[b.pos:b.pos+4], v)
b.pos += 4
}
func (b *Buffer) EncodeUint64(v uint64) {
order.PutUint64(b.buf[b.pos:b.pos+8], v)
b.pos += 8
}
func (b *Buffer) EncodeFloat64(v float64) {
order.PutUint64(b.buf[b.pos:b.pos+8], math.Float64bits(v))
b.pos += 8
}
func (b *Buffer) EncodeString(v string, length int) {
copy(b.buf[b.pos:b.pos+length], v)
b.pos += length
}
func DecodeString(b []byte) string {
sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&b))
stringHeader := reflect.StringHeader{Data: sliceHeader.Data, Len: sliceHeader.Len}
return *(*string)(unsafe.Pointer(&stringHeader))
}
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