moonlight-android/app/src/main/java/com/limelight/utils/CacheHelper.java

package com.limelight.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.util.Scanner;

public class CacheHelper {
    private static File openPath(boolean createPath, File root, String... path) {
        File f = root;
        for (int i = 0; i < path.length; i++) {
            String component = path[i];

            if (i == path.length - 1) {
                // This is the file component so now we create parent directories
                if (createPath) {
                    f.mkdirs();
                }
            }

            f = new File(f, component);
        }
        return f;
    }

    public static FileInputStream openCacheFileForInput(File root, String... path) throws FileNotFoundException {
        return new FileInputStream(openPath(false, root, path));
    }

    public static FileOutputStream openCacheFileForOutput(File root, String... path) throws FileNotFoundException {
        return new FileOutputStream(openPath(true, root, path));
    }

    public static String readInputStreamToString(InputStream in) {
        Scanner s = new Scanner(in);

        StringBuilder sb = new StringBuilder();
        while (s.hasNext()) {
            sb.append(s.next());
        }

        return sb.toString();
    }

    public static void writeStringToOutputStream(OutputStream out, String str) throws IOException {
        out.write(str.getBytes("UTF-8"));
    }
}