mirror of
https://gitee.com/johng/gf.git
synced 2024-12-03 04:37:49 +08:00
282 lines
6.7 KiB
Go
282 lines
6.7 KiB
Go
// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gbinary
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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)
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// LeEncode encodes one or multiple <values> into bytes using LittleEndian.
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// It uses type asserting checking the type of each value of <values> and internally
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// calls corresponding converting function do the bytes converting.
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//
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// It supports common variable type asserting, and finally it uses fmt.Sprintf converting
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// value to string and then to bytes.
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func LeEncode(values ...interface{}) []byte {
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buf := new(bytes.Buffer)
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for i := 0; i < len(values); i++ {
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if values[i] == nil {
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return buf.Bytes()
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}
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switch value := values[i].(type) {
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case int:
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buf.Write(LeEncodeInt(value))
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case int8:
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buf.Write(LeEncodeInt8(value))
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case int16:
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buf.Write(LeEncodeInt16(value))
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case int32:
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buf.Write(LeEncodeInt32(value))
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case int64:
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buf.Write(LeEncodeInt64(value))
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case uint:
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buf.Write(LeEncodeUint(value))
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case uint8:
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buf.Write(LeEncodeUint8(value))
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case uint16:
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buf.Write(LeEncodeUint16(value))
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case uint32:
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buf.Write(LeEncodeUint32(value))
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case uint64:
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buf.Write(LeEncodeUint64(value))
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case bool:
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buf.Write(LeEncodeBool(value))
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case string:
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buf.Write(LeEncodeString(value))
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case []byte:
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buf.Write(value)
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case float32:
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buf.Write(LeEncodeFloat32(value))
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case float64:
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buf.Write(LeEncodeFloat64(value))
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default:
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if err := binary.Write(buf, binary.LittleEndian, value); err != nil {
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buf.Write(LeEncodeString(fmt.Sprintf("%v", value)))
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}
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}
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}
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return buf.Bytes()
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}
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// 将变量转换为二进制[]byte，并指定固定的[]byte长度返回，长度单位为字节(byte)；
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// 如果转换的二进制长度超过指定长度，那么进行截断处理
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func LeEncodeByLength(length int, values ...interface{}) []byte {
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b := LeEncode(values...)
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if len(b) < length {
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b = append(b, make([]byte, length-len(b))...)
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} else if len(b) > length {
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b = b[0:length]
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}
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return b
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}
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// 整形二进制解包，注意第二个及其后参数为字长确定的整形变量的指针地址，以便确定解析的[]byte长度，
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// 例如：int8/16/32/64、uint8/16/32/64、float32/64等等
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func LeDecode(b []byte, values ...interface{}) error {
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buf := bytes.NewBuffer(b)
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for i := 0; i < len(values); i++ {
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err := binary.Read(buf, binary.LittleEndian, values[i])
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if err != nil {
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return err
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}
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}
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return nil
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}
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func LeEncodeString(s string) []byte {
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return []byte(s)
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}
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func LeDecodeToString(b []byte) string {
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return string(b)
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}
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func LeEncodeBool(b bool) []byte {
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if b == true {
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return []byte{1}
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} else {
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return []byte{0}
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}
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}
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// 自动识别int类型长度，转换为[]byte
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func LeEncodeInt(i int) []byte {
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if i <= math.MaxInt8 {
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return EncodeInt8(int8(i))
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} else if i <= math.MaxInt16 {
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return EncodeInt16(int16(i))
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} else if i <= math.MaxInt32 {
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return EncodeInt32(int32(i))
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} else {
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return EncodeInt64(int64(i))
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}
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}
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// 自动识别uint类型长度，转换为[]byte
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func LeEncodeUint(i uint) []byte {
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if i <= math.MaxUint8 {
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return EncodeUint8(uint8(i))
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} else if i <= math.MaxUint16 {
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return EncodeUint16(uint16(i))
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} else if i <= math.MaxUint32 {
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return EncodeUint32(uint32(i))
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} else {
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return EncodeUint64(uint64(i))
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}
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}
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func LeEncodeInt8(i int8) []byte {
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return []byte{byte(i)}
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}
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func LeEncodeUint8(i uint8) []byte {
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return []byte{i}
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}
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func LeEncodeInt16(i int16) []byte {
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b := make([]byte, 2)
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binary.LittleEndian.PutUint16(b, uint16(i))
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return b
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}
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func LeEncodeUint16(i uint16) []byte {
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b := make([]byte, 2)
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binary.LittleEndian.PutUint16(b, i)
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return b
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}
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func LeEncodeInt32(i int32) []byte {
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b := make([]byte, 4)
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binary.LittleEndian.PutUint32(b, uint32(i))
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return b
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}
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func LeEncodeUint32(i uint32) []byte {
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b := make([]byte, 4)
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binary.LittleEndian.PutUint32(b, i)
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return b
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}
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func LeEncodeInt64(i int64) []byte {
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b := make([]byte, 8)
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binary.LittleEndian.PutUint64(b, uint64(i))
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return b
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}
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func LeEncodeUint64(i uint64) []byte {
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b := make([]byte, 8)
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binary.LittleEndian.PutUint64(b, i)
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return b
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}
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func LeEncodeFloat32(f float32) []byte {
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bits := math.Float32bits(f)
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b := make([]byte, 4)
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binary.LittleEndian.PutUint32(b, bits)
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return b
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}
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func LeEncodeFloat64(f float64) []byte {
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bits := math.Float64bits(f)
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b := make([]byte, 8)
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binary.LittleEndian.PutUint64(b, bits)
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return b
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}
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// 将二进制解析为int类型，根据[]byte的长度进行自动转换.
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// 注意内部使用的是uint*，使用int会造成位丢失。
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func LeDecodeToInt(b []byte) int {
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if len(b) < 2 {
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return int(LeDecodeToUint8(b))
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} else if len(b) < 3 {
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return int(LeDecodeToUint16(b))
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} else if len(b) < 5 {
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return int(LeDecodeToUint32(b))
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} else {
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return int(LeDecodeToUint64(b))
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}
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}
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// 将二进制解析为uint类型，根据[]byte的长度进行自动转换
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func LeDecodeToUint(b []byte) uint {
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if len(b) < 2 {
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return uint(LeDecodeToUint8(b))
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} else if len(b) < 3 {
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return uint(LeDecodeToUint16(b))
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} else if len(b) < 5 {
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return uint(LeDecodeToUint32(b))
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} else {
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return uint(LeDecodeToUint64(b))
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}
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}
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// 将二进制解析为bool类型，识别标准是判断二进制中数值是否都为0，或者为空。
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func LeDecodeToBool(b []byte) bool {
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if len(b) == 0 {
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return false
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}
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if bytes.Compare(b, make([]byte, len(b))) == 0 {
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return false
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}
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return true
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}
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func LeDecodeToInt8(b []byte) int8 {
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return int8(b[0])
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}
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func LeDecodeToUint8(b []byte) uint8 {
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return uint8(b[0])
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}
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func LeDecodeToInt16(b []byte) int16 {
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return int16(binary.LittleEndian.Uint16(LeFillUpSize(b, 2)))
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}
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func LeDecodeToUint16(b []byte) uint16 {
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return binary.LittleEndian.Uint16(LeFillUpSize(b, 2))
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}
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func LeDecodeToInt32(b []byte) int32 {
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return int32(binary.LittleEndian.Uint32(LeFillUpSize(b, 4)))
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}
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func LeDecodeToUint32(b []byte) uint32 {
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return binary.LittleEndian.Uint32(LeFillUpSize(b, 4))
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}
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func LeDecodeToInt64(b []byte) int64 {
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return int64(binary.LittleEndian.Uint64(LeFillUpSize(b, 8)))
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}
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func LeDecodeToUint64(b []byte) uint64 {
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return binary.LittleEndian.Uint64(LeFillUpSize(b, 8))
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}
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func LeDecodeToFloat32(b []byte) float32 {
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return math.Float32frombits(binary.LittleEndian.Uint32(LeFillUpSize(b, 4)))
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}
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func LeDecodeToFloat64(b []byte) float64 {
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return math.Float64frombits(binary.LittleEndian.Uint64(LeFillUpSize(b, 8)))
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}
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// 当b位数不够时，进行高位补0。
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// 注意这里为了不影响原有输入参数，是采用的值复制设计。
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func LeFillUpSize(b []byte, l int) []byte {
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if len(b) >= l {
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return b[:l]
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}
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c := make([]byte, l)
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copy(c, b)
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return c
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}
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