scusi / parseFritzBpjmFile.go

// parse a FritzBox Bpjm File package main import ( "os" "fmt" "bytes" "io" "io/ioutil" ) // error checking function that panics on error func check(err error) { if err != nil { panic(err) } } // cut away null byte padding func cutNullBytes (data []byte) (nd []byte) { nd = bytes.Trim(data, string(0x00)) return nd } func main() { // get filename to parse filename := os.Args[1] // read in file dat, err := ioutil.ReadFile(filename) check(err) // make a bytes buffer of file content buf := bytes.NewBuffer(dat) // print legth of buffer fmt.Printf("Länge der eingelesenen Daten: %d bytes\n", buf.Len()) // extract magick number magick := buf.Next(5) fmt.Printf("Magick: %x\n", magick) // extract embedded filename embed_filename := buf.Next(59) fmt.Printf("Filename: %s\n", string(cutNullBytes(embed_filename))) // parse the rest of the file (actual bpjm list data) n := 0 for { entry := make([]byte, 33) _, err := buf.Read(entry) if err != nil { if err == io.EOF { break } panic(err) } //fmt.Printf("%x_%04d: %x %x %x\n", magick, n, entry[0:15], entry[16:31], entry[32]) fmt.Printf("%s_%04d: %x %x %x\n", cutNullBytes(embed_filename), n, entry[0:15], entry[16:31], entry[32]) n++ } }