100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package crc8
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import (
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"context"
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"flag"
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"fmt"
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"hash_utils/tools"
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"os"
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"github.com/google/subcommands"
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"github.com/sigurn/crc8"
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)
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type (
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CRC8Cmd struct {
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file string
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table string
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}
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)
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var (
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tables = []crc8.Params{
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crc8.CRC8,
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crc8.CRC8_CDMA2000,
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crc8.CRC8_DARC,
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crc8.CRC8_DVB_S2,
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crc8.CRC8_EBU,
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crc8.CRC8_I_CODE,
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crc8.CRC8_ITU,
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crc8.CRC8_MAXIM,
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crc8.CRC8_ROHC,
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crc8.CRC8_WCDMA,
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}
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)
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func (*CRC8Cmd) Name() string { return "crc8" }
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func (*CRC8Cmd) Synopsis() string { return "" }
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func (*CRC8Cmd) Usage() string {
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res := "Usage: hash_utils crc8\n\n"
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res += "Algorithm available:\n"
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for _, table := range tables {
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res += " - " + table.Name + "\n"
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}
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res += "\nOptions:\n"
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return res
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}
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func (p *CRC8Cmd) SetFlags(f *flag.FlagSet) {
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f.StringVar(&p.file, "file", "", "get the checksum of a file")
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f.StringVar(&p.table, "table", crc8.CRC8.Name, "Predefined CRC-8 algorithms")
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}
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func (p *CRC8Cmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
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var err error
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param := crc8.CRC8
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if len(p.table) > 0 {
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param, err = parse(p.table)
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if err != nil {
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fmt.Printf("Available tables: ")
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for _, table := range tables {
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fmt.Printf("%s ", table.Name)
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}
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fmt.Println()
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fmt.Fprintln(os.Stderr, "error:", err)
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return subcommands.ExitFailure
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}
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}
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if len(p.file) > 0 {
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b, err := os.ReadFile(p.file)
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if err != nil {
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fmt.Fprintln(os.Stderr, "error: failed to read file:", err)
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return subcommands.ExitFailure
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}
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h := tools.CRC8(b, param)
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fmt.Printf("%s: %s\n", f.Name(), h)
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return subcommands.ExitSuccess
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}
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for _, arg := range f.Args() {
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h := tools.CRC8([]byte(arg), param)
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fmt.Printf("%s: %s\n", arg, h)
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}
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return subcommands.ExitSuccess
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}
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func parse(tableName string) (crc8.Params, error) {
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for _, table := range tables {
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if table.Name == tableName {
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return table, nil
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}
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}
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return crc8.CRC8, fmt.Errorf("invalid table name: %s", tableName)
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}
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