78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
// 提供CRC16校验和计算功能。
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package crc16
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import (
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"encoding/hex"
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"fmt"
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"io"
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"os"
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"github.com/howeyc/crc16"
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)
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type CRC16Mode int
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const (
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CCITT CRC16Mode = iota
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CCITT_FALSE
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SCSI
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IBM
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MBUS
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)
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// 根据给定的校验表类型生成对应的校验器
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func hasherSelect(mdoe CRC16Mode) crc16.Hash16 {
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switch mdoe {
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case CCITT:
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return crc16.NewCCITT()
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case CCITT_FALSE:
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return crc16.New(crc16.MakeTable(crc16.CCITTFalse))
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case SCSI:
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return crc16.NewSCSI()
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case IBM:
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return crc16.NewIBM()
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case MBUS:
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return crc16.New(crc16.MakeTable(crc16.MBUS))
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default:
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return crc16.NewIBM()
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}
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}
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// 计算给定字节数组的CRC16校验和，返回字节数组
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func CRC16(data []byte, mode ...CRC16Mode) []byte {
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crcTable := append(mode, IBM)
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hasher := hasherSelect(crcTable[0])
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hasher.Write(data)
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return hasher.Sum(nil)
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}
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// 计算给定字节数组的CRC16校验和，返回十六进制字符串
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func CRC16Hex(data []byte, mode ...CRC16Mode) string {
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return hex.EncodeToString(CRC16(data, mode...))
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}
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// 计算指定文件的CRC16校验和，返回字节数组
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func SumFile(file string, mode ...CRC16Mode) ([]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(mode, IBM)
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hasher := hasherSelect(crcTable[0])
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if _, err := io.Copy(hasher, f); err != nil {
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return nil, fmt.Errorf("未能读取指定文件的内容，%w", err)
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}
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return hasher.Sum(nil), nil
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}
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// 计算指定文件的CRC16校验和，返回十六进制字符串
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func SumFileHex(file string, mode ...CRC16Mode) (string, error) {
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hash, err := SumFile(file, mode...)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(hash), nil
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}
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