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:com.redsqirl.workflow.utils.FileStream.java

public static byte[] decryptFile(File in) throws Exception {
    //Decrypt the file data:
    byte[] encData;

    //Read in the file:
    FileInputStream inStream = new FileInputStream(in);
    encData = new byte[(int) in.length()];
    inStream.read(encData);/*from www. j a va2 s .c o m*/
    inStream.close();

    byte[] decData = decrypt(encData);

    //Figure out how much padding to remove
    int padCount = (int) decData[decData.length - 1];

    //Naive check, will fail if plaintext file actually contained
    //this at the end
    //For robust check, check that padCount bytes at the end have same value
    if (padCount >= 1 && padCount <= 8) {
        decData = Arrays.copyOfRange(decData, 0, decData.length - padCount);
    }

    //Write the decrypted data to a new file:
    return decData;
}

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From source file:com.yifanlu.PSXperiaTool.ZpakCreate.java

public static long getCRC32(File file) throws IOException {
    CheckedInputStream cis = null;
    long fileSize = 0;
    // Computer CRC32 checksum
    cis = new CheckedInputStream(new FileInputStream(file), new CRC32());

    fileSize = file.length();

    byte[] buf = new byte[128];
    while (cis.read(buf) != -1)
        ;/*from   w ww.ja  v a  2s  .  c  o m*/

    long checksum = cis.getChecksum().getValue();
    cis.close();
    Logger.verbose("CRC32 of %s is %d", file.getPath(), checksum);
    return checksum;
}

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From source file:com.enonic.esl.io.FileUtil.java

/**
 * Returns the contents of the file in a byte array.
 *
 * @param file the file info/*  ww w .  ja v a2  s  .  c om*/
 * @return a byte array containing the file's contents
 * @throws IOException
 */
public static byte[] getBytesFromFile(File file) throws IOException {
    InputStream is = new FileInputStream(file);

    // Get the size of the file
    long length = file.length();

    // You cannot create an array using a long type.
    // It needs to be an int type.
    // Before converting to an int type, check
    // to ensure that file is not larger than Integer.MAX_VALUE.
    if (length > Integer.MAX_VALUE) {
        // File is too large
    }

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

    // Read in the bytes
    int offset = 0;
    int numRead = 0;
    while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
        offset += numRead;
    }

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

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

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From source file:com.mirth.connect.server.util.FileUtil.java

/**
 * Returns the contents of the file in a byte array.
 * /*from  w w  w  . ja v a2 s  . co m*/
 * @deprecated
 * @see org.apache.commons.io.FileUtils#readFileToByteArray(File)
 * @param fileName
 * @return
 * @throws IOException
 */
public static byte[] readBytes(String fileName) throws IOException {
    File file = new File(fileName);
    InputStream is = new FileInputStream(file);

    // Get the size of the file
    long length = file.length();

    // You cannot create an array using a long type.
    // It needs to be an int type.
    // Before converting to an int type, check
    // to ensure that file is not larger than Integer.MAX_VALUE.
    if (length > Integer.MAX_VALUE) {
        // File is too large
        throw new IOException("File too large " + file.getName());
    }

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

    // Read in the bytes
    int offset = 0;
    int numRead = 0;
    while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
        offset += numRead;
    }

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

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

---

From source file:cz.autoclient.league_of_legends.DataLoader.java

public static JSONObject fromFile(File file) throws FileNotFoundException {
    char[] buff = new char[(int) file.length()];
    try {//w w  w.  j  a  v a2s .  co m
        (new FileReader(file)).read(buff);
    } catch (IOException e) {
        throw new FileNotFoundException("Invalid file.");
    }

    String result = new StringBuilder().append(buff).toString();
    //System.out.println("JSON from file:\n"+result);
    try {
        return new JSONObject(result);
    } catch (JSONException ex) {
        throw new FileNotFoundException("Invalid file contents - \n         JSON error:" + ex);
        //Logger.getLogger(DataLoader.class.getName()).log(Level.SEVERE, null, ex);
    }
}

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From source file:ch.vorburger.mariadb4j.Util.java

/**
 * Extract files from a package on the classpath into a directory.
 * /*www . j a  va2  s  .c o  m*/
 * @param packagePath e.g. "com/stuff" (always forward slash not backslash, never dot)
 * @param toDir directory to extract to
 * @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
            final URL url = resource.getURL();
            String path = url.toString();
            if (!path.endsWith("/")) { // Skip directories
                int p = path.lastIndexOf(packagePath) + packagePath.length();
                path = path.substring(p);
                final File targetFile = new File(toDir, path);
                long len = resource.contentLength();
                if (!targetFile.exists() || targetFile.length() != len) { // Only copy new files
                    tryN(5, 500, new Procedure<IOException>() {

                        @Override
                        public void apply() throws IOException {
                            FileUtils.copyURLToFile(url, targetFile);
                        }
                    });
                    counter++;
                }
            }
        }
    }
    if (counter > 0) {
        Object[] info = new Object[] { counter, locationPattern, toDir };
        logger.info("Unpacked {} files from {} to {}", info);
    }
    return counter;
}

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From source file:msec.org.TarUtil.java

private static void archiveFile(File file, TarArchiveOutputStream taos, String dir) throws Exception {

    TarArchiveEntry entry = new TarArchiveEntry(dir + file.getName());

    entry.setSize(file.length());

    taos.putArchiveEntry(entry);//w  ww .  j a va2 s .c  om

    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
    int count;
    byte data[] = new byte[BUFFERSZ];
    while ((count = bis.read(data, 0, BUFFERSZ)) != -1) {
        taos.write(data, 0, count);
    }

    bis.close();

    taos.closeArchiveEntry();
}

---

From source file:Main.java

public static double getSize(File file) {
    if (file.exists()) {
        if (!file.isFile()) {
            File[] fl = file.listFiles();
            double ss = 0;
            for (File f : fl) {
                ss += getSize(f);/*w  ww.  j a  va2  s. com*/
            }
            return ss;
        } else {
            double ss = (double) file.length() / 1024 / 1024;
            return ss;
        }
    } else {
        return 0.0;
    }
}

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From source file:Main.java

public static double getDirUsageCapacity(String filePath) {
    File file = new File(filePath);
    if (!file.exists()) {
        return 0;
    }/*from  w  w  w  .ja v a2 s .c o  m*/

    if (file.isDirectory()) {
        double size = 0;
        for (File f : file.listFiles()) {
            size += getDirUsageCapacity(f.getPath());
        }
        return size;
    } else {
        return file.length();
    }
}

---

From source file:Main.java

/**
 * Copies the contents of the file in {@code src} to {@code dst} and then deletes the {@code src} if copy was successful.
 * If the file copy was unsuccessful, the src file will not be deleted.
 * @param src Source file//w w w.j  av  a  2 s .  c o m
 * @param dst Destination file
 * @throws IOException if an error occurred during the file copy
 */
static void moveFile(File src, File dst) throws IOException {
    FileChannel inChannel = new FileInputStream(src).getChannel();
    FileChannel outChannel = new FileOutputStream(dst).getChannel();
    try {
        long bytesCopied = inChannel.transferTo(0, inChannel.size(), outChannel);
        if (bytesCopied >= src.length())
            src.delete();
    } finally {
        if (inChannel != null)
            inChannel.close();
        outChannel.close();
    }
}

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