Decrypt Wav File

wavdecode.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
)

var delimiter = [...]byte{96, 240, 96, 240}
var beatDelimiter = [...]byte{160, 15}
var squarNegativeSwitch = [...]byte{160, 15, 160}

func main() {
	readTwo()
}

func readTwo() {
	file, _ := os.Open("message4.wav")
	defer file.Close()
	content, _ := ioutil.ReadAll(file)
	var output []int
	var intermediary []int
	conL := len(content)
	for i := 0; i < conL; i++ {
		if content[i] == delimiter[0] {
			if i+2 >= conL {
				break
			}
			if content[i+1] == delimiter[1] && content[i+2] == delimiter[2] && content[i+3] == delimiter[3] {
				intermediary = splitIntermediary(intermediary)
				output = append(output, soundCount(intermediary))
				intermediary = []int{}
			}
		}
		intermediary = append(intermediary, int(content[i]))
	}
	output = append(output, soundCount(intermediary)-1)
	fmt.Println(output)
}

func splitIntermediary(inter []int) []int {
	iL := len(inter)
	for i := 0; i < iL; i++ {
		if i+2 >= iL {
			break
		}
		if inter[i] == 160 && inter[i+1] == 15 && inter[i+2] == 160 {
			return inter[:i+1]
		}
	}
	return []int{}
}

func soundCount(sounds []int) (s int) {
	sL := len(sounds)
	for i := 0; i < sL; i++ {
		if sounds[i] == int(beatDelimiter[0]) {
			if i+1 >= sL {
				break
			}
			if sounds[i+1] == int(beatDelimiter[1]) {
				s++
			}
		}
	}
	return s + 1
}