75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
// 提供CRC8校验和计算功能。
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package crc8
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import (
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"encoding/hex"
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"fmt"
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"os"
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"github.com/sigurn/crc8"
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)
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// 根据提供的校验表名称生成对应的校验表
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func hasherSelect(table string) *crc8.Table {
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switch table {
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case "CRC8":
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return crc8.MakeTable(crc8.CRC8)
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case "CDMA2000":
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return crc8.MakeTable(crc8.CRC8_CDMA2000)
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case "DARC":
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return crc8.MakeTable(crc8.CRC8_DARC)
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case "DVB-S2":
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return crc8.MakeTable(crc8.CRC8_DVB_S2)
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case "EBU":
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return crc8.MakeTable(crc8.CRC8_EBU)
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case "I-CODE":
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return crc8.MakeTable(crc8.CRC8_I_CODE)
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case "ITU":
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return crc8.MakeTable(crc8.CRC8_ITU)
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case "MAXIM":
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return crc8.MakeTable(crc8.CRC8_MAXIM)
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case "ROHC":
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return crc8.MakeTable(crc8.CRC8_ROHC)
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case "WCDMA":
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return crc8.MakeTable(crc8.CRC8_WCDMA)
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default:
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return crc8.MakeTable(crc8.CRC8)
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}
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}
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// 计算给定字节数组的CRC8校验和，返回字节数组
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func CRC8(data []byte, table ...string) []byte {
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crcTable := append(table, "CRC8")
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return []byte{crc8.Checksum(data, hasherSelect(crcTable[0]))}
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}
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// 计算给定字节数组的CRC8校验和，返回十六进制字符串
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func CRC8Hex(data []byte, table ...string) string {
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return hex.EncodeToString(CRC8(data, table...))
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}
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// 计算指定文件的CRC8校验和，返回字节数组
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func SumFile(file string, table ...string) ([]byte, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, fmt.Errorf("未能打开指定文件，%w", err)
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}
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defer f.Close()
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crcTable := append(table, "CRC8")
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var buf = make([]byte, 0)
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if _, err := f.Read(buf); err != nil {
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return nil, fmt.Errorf("读取指定文件内容出错，%w", err)
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}
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return []byte{crc8.Checksum(buf, hasherSelect(crcTable[0]))}, nil
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}
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// 计算指定文件的CRC8校验和，返回十六进制字符串
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func SumFileHex(file string, table ...string) (string, error) {
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crc, err := SumFile(file, table...)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(crc), nil
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}
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