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