Example usage for java.io File length

Introduction

In this page you can find the example usage for java.io File length.

Prototype

public long length() 

Source Link

Document

Returns the length of the file denoted by this abstract pathname.

Usage

From source file:Main.java

public static KeyPair loadKeyPair(Context context, String name)
        throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
    // Read Public Key.
    File filePublicKey = new File(context.getFilesDir(), name + "_public.key");
    FileInputStream fis = new FileInputStream(filePublicKey);
    byte[] encodedPublicKey = new byte[(int) filePublicKey.length()];
    fis.read(encodedPublicKey);// w ww .  j  a  v a  2s . c  o  m
    fis.close();

    // Read Private Key.
    File filePrivateKey = new File(context.getFilesDir(), name + "_private.key");
    fis = new FileInputStream(filePrivateKey);
    byte[] encodedPrivateKey = new byte[(int) filePrivateKey.length()];
    fis.read(encodedPrivateKey);
    fis.close();

    // Generate KeyPair.
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(encodedPublicKey);
    PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

    PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
    PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

    return new KeyPair(publicKey, privateKey);
}

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From source file:Main.java

public static int fileSize(String dir, String fileName) {
    File sdLien = Environment.getExternalStorageDirectory();
    File inFile = new File(sdLien + File.separator + dir + File.separator + fileName);
    Log.d(TAG, "path of file : " + inFile);
    if (!inFile.exists()) {
        throw new RuntimeException("File doesn't exist");
    }/*w  w  w. j a  va2s .  co m*/
    return ((int) inFile.length());
}

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From source file:Main.java

public static boolean isWAVFile(String fileName) {

    byte header[] = new byte[16];
    try {//from   w  w w. j  a  v a 2 s  . c  om
        File f = new File(fileName);
        if (!f.exists()) {
            Log.d("OpusTool", fileName + ":" + "File does not exist.");
            return false;
        }
        long actualLength = f.length();
        FileInputStream io = new FileInputStream(f);
        io.read(header, 0, 16);
        io.close();

        String tag = new String(header, 0, 4) + new String(header, 8, 8);
        if (!tag.equals("RIFFWAVEfmt ")) {
            Log.d("OpusTool", fileName + ":" + "It's not a WAV file!");
            return false;
        }

        long paraLength = (header[4] & 0x000000ff) | ((header[5] << 8) & 0x0000ff00)
                | ((header[6] << 16) & 0x00ff0000) | ((header[7] << 24) & 0xff000000);
        if (paraLength != actualLength - 8) {
            Log.d("OpusTool", fileName + ":" + "It might be a WAV file, but it's corrupted!");
            return false;
        }
        return true;

    } catch (Exception e) {
        Log.d("OpusTool", fileName + ":" + "File Error");
        return false;
    }
}

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From source file:Main.java

public static String[] getAvailableSchedulers() {
    File iofile = new File("/sys/block/mmcblk0/queue/scheduler");
    String s = "";
    FileInputStream fin2 = null;//from w w  w . ja  v a2s  . c om
    try {
        fin2 = new FileInputStream(iofile);
        byte fileContent[] = new byte[(int) iofile.length()];
        fin2.read(fileContent);
        s = new String(fileContent).trim().split("\n")[0];
    } catch (FileNotFoundException e) {
        //System.out.println("File not found" + e);
    } catch (IOException ioe) {
        //System.out.println("Exception while reading file " + ioe);
    } finally {
        try {
            if (fin2 != null) {
                fin2.close();
            }
        } catch (IOException ioe) {
            //System.out.println("Error while closing stream: " + ioe);
        }
    }
    String[] IOSchedulers = s.replace("[", "").replace("]", "").split(" ");
    return IOSchedulers;
}

---

From source file:com.redsqirl.workflow.utils.FileStream.java

public static byte[] encryptFile(File in) throws Exception {
    int blockSize = 8;
    //Figure out how many bytes are padded
    int paddedCount = blockSize - ((int) in.length() % blockSize);

    //Figure out full size including padding
    int padded = (int) in.length() + paddedCount;

    byte[] decData = new byte[padded];
    FileInputStream inStream = new FileInputStream(in);
    inStream.read(decData);//  w  ww.  j  a  va  2  s  .  c o m
    inStream.close();

    //Write out padding bytes as per PKCS5 algorithm
    for (int i = (int) in.length(); i < padded; ++i) {
        decData[i] = (byte) paddedCount;
    }

    return encrypt(decData);
}

---

From source file:Main.java

public static String getCurrentScheduler() {
    File iofile = new File("/sys/block/mmcblk0/queue/scheduler");
    String s = "";
    FileInputStream fin2 = null;//from  www  .  jav  a2s  .  c o m
    try {
        fin2 = new FileInputStream(iofile);
        byte fileContent[] = new byte[(int) iofile.length()];
        fin2.read(fileContent);
        s = new String(fileContent).trim().split("\n")[0];
    } catch (FileNotFoundException e) {
        //System.out.println("File not found" + e);
    } catch (IOException ioe) {
        //System.out.println("Exception while reading file " + ioe);
    } finally {
        try {
            if (fin2 != null) {
                fin2.close();
            }
        } catch (IOException ioe) {
            //System.out.println("Error while closing stream: " + ioe);
        }
    }
    int bropen = s.indexOf("[");
    int brclose = s.lastIndexOf("]");
    return s.substring(bropen + 1, brclose);
}

---

From source file:Main.java

public static void WriteTxtFile(Context context, String strcontent) {

    String strContent = strcontent + "\n";
    try {// ww  w  .ja va2 s  . c  om
        File file = new File(context.getCacheDir() + File.separator + "wanjia.txt");
        if (!file.exists()) {
            file.createNewFile();
        }
        RandomAccessFile raf = new RandomAccessFile(file, "rw");
        raf.seek(file.length());
        raf.write(strContent.getBytes());
        raf.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

From source file:com.intuit.cto.selfservice.service.Util.java

/**
 * Extract files from a package on the classpath into a directory.
 * @param packagePath e.g. "com/stuff" (always forward slash not backslash, never dot)
 * @param toDir directory to extract to//from  w  w  w.j a  va2 s.  c  o  m
 * @return int the number of files copied
 * @throws java.io.IOException if something goes wrong, including if nothing was found on classpath
 */
public static int extractFromClasspathToFile(String packagePath, File toDir) throws IOException {
    String locationPattern = "classpath*:" + packagePath + "/**";
    ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
    Resource[] resources = resourcePatternResolver.getResources(locationPattern);
    if (resources.length == 0) {
        throw new IOException("Nothing found at " + locationPattern);
    }
    int counter = 0;
    for (Resource resource : resources) {
        if (resource.isReadable()) { // Skip hidden or system files
            URL url = resource.getURL();
            String path = url.toString();
            if (!path.endsWith("/")) { // Skip directories
                int p = path.lastIndexOf(packagePath) + packagePath.length();
                path = path.substring(p);
                File targetFile = new File(toDir, path);
                long len = resource.contentLength();
                if (!targetFile.exists() || targetFile.length() != len) { // Only copy new files
                    FileUtils.copyURLToFile(url, targetFile);
                    counter++;
                }
            }
        }
    }
    logger.info("Unpacked {} files from {} to {}", new Object[] { counter, locationPattern, toDir });
    return counter;
}

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From source file:net.sourceforge.jencrypt.lib.Utils.java

/**
 * Return the contents of a file as a byte array.
 * //from   w  w w.ja  va2  s .  c om
 * @param file
 * @return
 * @throws IOException
 */
public static byte[] getBytesFromFile(File file) throws IOException {

    if (file.length() > Integer.MAX_VALUE) {
        // File is too large
        throw new IOException("File '" + file.getName() + "' is bigger than Integer.MAX_VALUE (>2GB)");
    }
    InputStream in = new FileInputStream(file);

    // Create the byte array to hold the data
    byte[] bytes = new byte[(int) file.length()];

    int len = 0;

    // Reads bytes from the input stream and store them in buffer bytes
    len = in.read(bytes);

    // Ensure all the bytes have been read in
    if (len != bytes.length) {
        in.close();
        throw new IOException("Could not completely read file " + file.getName());
    }

    // Close the input stream and return bytes
    in.close();
    return bytes;
}

---

From source file:Main.java

/**
 * @return A map of all storage locations available
 *//*w  w  w .  j av  a 2s .c o m*/
public static Map<String, File> getAllStorageLocations() {
    Map<String, File> map = new HashMap<String, File>(10);

    List<String> mMounts = new ArrayList<String>(10);
    List<String> mVold = new ArrayList<String>(10);
    mMounts.add("/mnt/sdcard");
    mVold.add("/mnt/sdcard");

    try {
        File mountFile = new File("/proc/mounts");
        if (mountFile.exists()) {
            Scanner scanner = new Scanner(mountFile);
            while (scanner.hasNext()) {
                String line = scanner.nextLine();
                if (line.startsWith("/dev/block/vold/")) {
                    String[] lineElements = line.split(" ");
                    String element = lineElements[1];

                    // don't add the default mount path
                    // it's already in the list.
                    if (!element.equals("/mnt/sdcard"))
                        mMounts.add(element);
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    try {
        File voldFile = new File("/system/etc/vold.fstab");
        if (voldFile.exists()) {
            Scanner scanner = new Scanner(voldFile);
            while (scanner.hasNext()) {
                String line = scanner.nextLine();
                if (line.startsWith("dev_mount")) {
                    String[] lineElements = line.split(" ");
                    String element = lineElements[2];

                    if (element.contains(":"))
                        element = element.substring(0, element.indexOf(":"));
                    if (!element.equals("/mnt/sdcard"))
                        mVold.add(element);
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    for (int i = 0; i < mMounts.size(); i++) {
        String mount = mMounts.get(i);
        if (!mVold.contains(mount))
            mMounts.remove(i--);
    }
    mVold.clear();

    List<String> mountHash = new ArrayList<String>(10);

    for (String mount : mMounts) {
        File root = new File(mount);
        if (root.exists() && root.isDirectory() && root.canWrite()) {
            File[] list = root.listFiles();
            String hash = "[";
            if (list != null) {
                for (File f : list) {
                    hash += f.getName().hashCode() + ":" + f.length() + ", ";
                }
            }
            hash += "]";
            if (!mountHash.contains(hash)) {
                String key = SD_CARD + "_" + map.size();
                if (map.size() == 0) {
                    key = SD_CARD;
                } else if (map.size() == 1) {
                    key = EXTERNAL_SD_CARD;
                }
                mountHash.add(hash);
                map.put(key, root);
            }
        }
    }

    mMounts.clear();

    if (map.isEmpty()) {
        map.put(SD_CARD, Environment.getExternalStorageDirectory());
    }
    return map;
}

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