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Add modhex cli

master
Blink The Things 3 years ago
parent
commit
c85c38df76
1 changed files with 81 additions and 0 deletions
  1. +81
    -0
      cmd/modhex.go

+ 81
- 0
cmd/modhex.go View File

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package main
import (
"encoding/hex"
"flag"
"fmt"
"os"
"strings"
"git.trashheap.io/blinkthethings/modhex"
)
func main() {
// configure command line flags
var decode, hexdata bool
flag.BoolVar(&decode, "d", false, "decode data (the default is to encode).")
flag.BoolVar(&hexdata, "x", false, "Use hex encoding for non-modhex data.")
flag.Usage = func() {
fmt.Println("modhex - encode/decode data using modhex encoding.")
fmt.Println()
fmt.Println("Usage:\n\n modex [-d] [-x] <data>")
fmt.Println()
fmt.Println(" Convert input DATA as specified and print output to STDOUT.")
fmt.Println()
fmt.Printf("Flags:\n\n")
flag.PrintDefaults()
fmt.Println()
}
flag.Parse()
if decode {
// decode was selected
// read the modhex string from the command line
src := []byte(strings.Join(flag.Args(), " "))
// create a buffer to hold the decoded data
dst := make([]byte, modhex.DecodedLen(len(src)))
// decode the input
_, err := modhex.Decode(dst, src)
if err != nil {
// report the error to the user
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
// should the output be a hex string?
if hexdata {
// print out the decoded data as a hex string
fmt.Println(hex.EncodeToString(src))
} else {
// print out the decoded bytes stdout
os.Stdout.Write(dst)
}
} else {
// encode was selected
// read the input data
var src []byte
if hexdata {
// read the input as a hex string
var err error
src, err = hex.DecodeString(flag.Arg(0))
if err != nil {
// report the hex decode error and exit
fmt.Fprintf(os.Stderr, "modhex: %s\n", err)
os.Exit(-1)
}
} else {
// read the input as bytes
src = []byte(strings.Join(flag.Args(), ""))
}
// encode the input
s := modhex.EncodeToString(src)
// print out the modhex encoded string
fmt.Println(s)
}
}

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