cmd: add hex-vis

helps debugging all this byte stuffk

Signed-off-by: Ciro S. Costa <[email protected]>

cmd/hex-vis/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"encoding/binary"
+	"os"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/jessevdk/go-flags"
+)
+
+var opts = struct {
+	Uint16 uint16 `long:"uint16"`
+	Uint32 uint32 `long:"uint32"`
+	String string `long:"string"`
+}{}
+
+func main() {
+	parser := flags.NewParser(&opts, flags.Default)
+
+	if _, err := parser.Parse(); err != nil {
+		os.Exit(1)
+	}
+
+	var b []byte
+
+	switch {
+	case opts.Uint16 != 0:
+		b = make([]byte, 2)
+		binary.LittleEndian.PutUint16(b, opts.Uint16)
+	case opts.Uint32 != 0:
+		b = make([]byte, 4)
+		binary.LittleEndian.PutUint32(b, opts.Uint32)
+	case len(opts.String) != 0:
+		b = []byte(opts.String)
+	default:
+		parser.WriteHelp(os.Stderr)
+		os.Exit(1)
+	}
+
+	spew.Dump(b)
+}