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88 lines
2.0 KiB
88 lines
2.0 KiB
// Command modhex is a simple modhex converstion command line tool.
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package main
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import (
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"encoding/hex"
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"flag"
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"fmt"
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"os"
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"strings"
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"git.trashheap.io/blinkthethings/modhex"
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)
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func main() {
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// configure command line flags
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var decode, hexdata bool
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flag.BoolVar(&decode, "d", false, "decode data (the default is to encode).")
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flag.BoolVar(&hexdata, "x", false, "Use hex encoding for non-modhex data.")
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flag.Usage = func() {
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fmt.Println("modhex - encode/decode data using modhex encoding.")
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fmt.Println()
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fmt.Println("Usage:\n\n modex [-d] [-x] <data>")
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fmt.Println()
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fmt.Println(" Convert input DATA as specified and print output to STDOUT.")
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fmt.Println()
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fmt.Printf("Flags:\n\n")
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flag.PrintDefaults()
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fmt.Println()
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}
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flag.Parse()
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// display usage if no data is provided
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if flag.NArg() < 1 {
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flag.Usage()
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os.Exit(0)
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}
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if decode {
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// decode was selected
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// read the modhex string from the command line
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src := []byte(strings.Join(flag.Args(), " "))
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// create a buffer to hold the decoded data
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dst := make([]byte, modhex.DecodedLen(len(src)))
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// decode the input
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_, err := modhex.Decode(dst, src)
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if err != nil {
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// report the error to the user
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fmt.Fprintln(os.Stderr, err)
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os.Exit(-1)
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}
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// should the output be a hex string?
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if hexdata {
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// print out the decoded data as a hex string
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fmt.Println(hex.EncodeToString(src))
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} else {
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// print out the decoded bytes stdout
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os.Stdout.Write(dst)
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}
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} else {
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// encode was selected
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// read the input data
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var src []byte
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if hexdata {
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// read the input as a hex string
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var err error
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src, err = hex.DecodeString(flag.Arg(0))
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if err != nil {
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// report the hex decode error and exit
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fmt.Fprintf(os.Stderr, "modhex: %s\n", err)
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os.Exit(-1)
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}
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} else {
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// read the input as bytes
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src = []byte(strings.Join(flag.Args(), ""))
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}
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// encode the input
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s := modhex.EncodeToString(src)
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// print out the modhex encoded string
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fmt.Println(s)
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}
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}
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