徐涛
90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
// 提供CRC8校验和计算功能。
|
|
package crc8
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"fmt"
|
|
"os"
|
|
|
|
"github.com/sigurn/crc8"
|
|
)
|
|
|
|
type CRC8Mode int
|
|
|
|
const (
|
|
ORIGIN CRC8Mode = iota
|
|
CDMA2000
|
|
DARC
|
|
DVB_S2
|
|
EBU
|
|
I_CODE
|
|
ITU
|
|
MAXIM
|
|
ROHC
|
|
WCDMA
|
|
)
|
|
|
|
// 根据提供的校验表名称生成对应的校验表
|
|
func hasherSelect(mode CRC8Mode) *crc8.Table {
|
|
switch mode {
|
|
case ORIGIN:
|
|
return crc8.MakeTable(crc8.CRC8)
|
|
case CDMA2000:
|
|
return crc8.MakeTable(crc8.CRC8_CDMA2000)
|
|
case DARC:
|
|
return crc8.MakeTable(crc8.CRC8_DARC)
|
|
case DVB_S2:
|
|
return crc8.MakeTable(crc8.CRC8_DVB_S2)
|
|
case EBU:
|
|
return crc8.MakeTable(crc8.CRC8_EBU)
|
|
case I_CODE:
|
|
return crc8.MakeTable(crc8.CRC8_I_CODE)
|
|
case ITU:
|
|
return crc8.MakeTable(crc8.CRC8_ITU)
|
|
case MAXIM:
|
|
return crc8.MakeTable(crc8.CRC8_MAXIM)
|
|
case ROHC:
|
|
return crc8.MakeTable(crc8.CRC8_ROHC)
|
|
case WCDMA:
|
|
return crc8.MakeTable(crc8.CRC8_WCDMA)
|
|
default:
|
|
return crc8.MakeTable(crc8.CRC8)
|
|
}
|
|
}
|
|
|
|
// 计算给定字节数组的CRC8校验和，返回字节数组
|
|
func CRC8(data []byte, mode ...CRC8Mode) []byte {
|
|
crcTable := append(mode, ORIGIN)
|
|
return []byte{crc8.Checksum(data, hasherSelect(crcTable[0]))}
|
|
}
|
|
|
|
// 计算给定字节数组的CRC8校验和，返回十六进制字符串
|
|
func CRC8Hex(data []byte, mode ...CRC8Mode) string {
|
|
return hex.EncodeToString(CRC8(data, mode...))
|
|
}
|
|
|
|
// 计算指定文件的CRC8校验和，返回字节数组
|
|
func SumFile(file string, mode ...CRC8Mode) ([]byte, error) {
|
|
f, err := os.Open(file)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("未能打开指定文件，%w", err)
|
|
}
|
|
defer f.Close()
|
|
|
|
crcTable := append(mode, ORIGIN)
|
|
var buf = make([]byte, 0)
|
|
if _, err := f.Read(buf); err != nil {
|
|
return nil, fmt.Errorf("读取指定文件内容出错，%w", err)
|
|
}
|
|
return []byte{crc8.Checksum(buf, hasherSelect(crcTable[0]))}, nil
|
|
}
|
|
|
|
// 计算指定文件的CRC8校验和，返回十六进制字符串
|
|
func SumFileHex(file string, mode ...CRC8Mode) (string, error) {
|
|
crc, err := SumFile(file, mode...)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return hex.EncodeToString(crc), nil
|
|
}
|