Example usage for java.io RandomAccessFile length

Introduction

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

Prototype

public native long length() throws IOException;

Source Link

Document

Returns the length of this file.

Usage

From source file:org.socialnetlib.android.AppdotnetApi.java

private static byte[] readFile(File file) throws IOException {
    // Open file//from   w w  w.  j  a  v a 2s  . c om
    RandomAccessFile f = new RandomAccessFile(file, "r");

    try {
        // Get and check length
        long longlength = f.length();
        int length = (int) longlength;
        if (length != longlength)
            throw new IOException("File size >= 2 GB");

        // Read file and return data
        byte[] data = new byte[length];
        f.readFully(data);
        return data;
    } finally {
        f.close();
    }
}

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From source file:eionet.eunis.servlets.DownloadServlet.java

/**
 * Copy the given byte range of the given input to the given output.
 *
 * @param input The input to copy the given range to the given output for.
 * @param output The output to copy the given range from the given input for.
 * @param start Start of the byte range.
 * @param length Length of the byte range.
 * @throws IOException If something fails at I/O level.
 *//*from ww  w. j  av  a 2 s.c  o m*/
private static void copy(RandomAccessFile input, OutputStream output, long start, long length)
        throws IOException {
    byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
    int read;

    if (input.length() == length) {
        // Write full range.
        while ((read = input.read(buffer)) > 0) {
            output.write(buffer, 0, read);
        }
    } else {
        // Write partial range.
        input.seek(start);
        long toRead = length;

        while ((read = input.read(buffer)) > 0) {
            toRead = toRead - read;
            if (toRead > 0) {
                output.write(buffer, 0, read);
            } else {
                output.write(buffer, 0, (int) toRead + read);
                break;
            }
        }
    }
}

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From source file:org.gcaldaemon.core.sendmail.SendMail.java

private static final String readContent(RandomAccessFile raf) throws Exception {
    String content = null;/*from w ww.ja v  a2s  . c o  m*/
    int len = Math.min((int) raf.length(), 500);
    byte[] bytes = new byte[len];
    raf.seek(0);
    raf.readFully(bytes);
    if (bytes[0] == -17 && bytes[1] == -69 && bytes[2] == -65) {

        // UTF-8 header found
        log.debug("File encoding is 'UTF-8'.");
        bytes = new byte[(int) raf.length() - 3];
        raf.seek(3);
        raf.readFully(bytes);
        content = StringUtils.decodeToString(bytes, StringUtils.UTF_8).trim();
    } else {

        // Autodetect encoding
        String header = StringUtils.decodeToString(bytes, StringUtils.US_ASCII).toUpperCase().replace(':', '=');
        String encoding = null;
        int pos = header.indexOf("ENCODING=");
        if (pos != -1) {
            int end = endOf(header, pos + 10);
            if (end != -1) {
                encoding = header.substring(pos + 9, end);
                encoding = encoding.replace('\'', ' ');
                encoding = encoding.replace('\"', ' ');
                encoding = encoding.trim();
            }
        }

        // Check XML-encoding
        if (encoding == null) {
            pos = header.indexOf("CHARSET=");
            if (pos != -1) {
                int end = endOf(header, pos + 10);
                if (end != -1) {
                    encoding = header.substring(pos + 8, end);
                    encoding = encoding.replace('\'', ' ');
                    encoding = encoding.replace('\"', ' ');
                    encoding = encoding.trim();
                }
            }
        }

        // Convert file encoding to Java encoding
        if (encoding == null) {
            encoding = Charset.defaultCharset().name();
        } else {
            if (encoding.equals("UTF8")) {
                encoding = StringUtils.UTF_8;
            }
        }
        log.debug("File encoding is '" + encoding + "'.");
        bytes = new byte[(int) raf.length()];
        raf.seek(0);
        raf.readFully(bytes);
        content = StringUtils.decodeToString(bytes, encoding).trim();
    }
    return content;
}

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From source file:ValidateLicenseHeaders.java

/**
 * Replace a legacy jboss header with the current default header
 * /*from   w  ww .  j  a v  a 2  s  .  c om*/
 * @param javaFile -
 *          the java source file
 * @param endOfHeader -
 *          the offset to the end of the legacy header
 * @throws IOException -
 *           thrown on failure to replace the header
 */
static void replaceHeader(File javaFile, long endOfHeader) throws IOException {
    if (log.isLoggable(Level.FINE))
        log.fine("Replacing legacy jboss header in: " + javaFile);
    RandomAccessFile raf = new RandomAccessFile(javaFile, "rw");
    File bakFile = new File(javaFile.getAbsolutePath() + ".bak");
    FileOutputStream fos = new FileOutputStream(bakFile);
    fos.write(DEFAULT_HEADER.getBytes());
    FileChannel fc = raf.getChannel();
    long count = raf.length() - endOfHeader;
    fc.transferTo(endOfHeader, count, fos.getChannel());
    fc.close();
    fos.close();
    raf.close();
    if (javaFile.delete() == false)
        log.severe("Failed to delete java file: " + javaFile);
    if (bakFile.renameTo(javaFile) == false)
        throw new SyncFailedException("Failed to replace: " + javaFile);
}

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From source file:com.polyvi.xface.util.XFileUtils.java

/**
 * ?//from   w  w w. j  av a  2  s.  com
 *
 * @param filePath
 *            ?
 * @param size
 *            size?
 * @return 
 */
public static long truncateFile(String fileName, long size) throws FileNotFoundException, IOException {
    RandomAccessFile raf = new RandomAccessFile(fileName, "rw");

    if (raf.length() >= size) {
        FileChannel channel = raf.getChannel();
        channel.truncate(size);
        return size;
    }

    return raf.length();
}

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From source file:azkaban.common.utils.Utils.java

/**
 * Read in content of a file and get the last *lineCount* lines. It is
 * equivalent to *tail* command/*www. ja va 2 s.  c o m*/
 * 
 * @param filename
 * @param lineCount
 * @param chunkSize
 * @return
 */
public static Vector<String> tail(String filename, int lineCount, int chunkSize) {
    try {
        // read in content of the file
        RandomAccessFile file = new RandomAccessFile(filename, "r");
        // destination vector
        Vector<String> lastNLines = new Vector<String>();
        // current position
        long currPos = file.length() - 1;
        long startPos;
        byte[] byteArray = new byte[chunkSize];

        // read in content of the file in reverse order
        while (true) {
            // read in from *fromPos*
            startPos = currPos - chunkSize;

            if (startPos <= 0) { // toward the beginning of the file
                file.seek(0);
                file.read(byteArray, 0, (int) currPos); // only read in
                                                        // curPos bytes
                parseLinesFromLast(byteArray, 0, (int) currPos, lineCount, lastNLines);
                break;
            } else {
                file.seek(startPos);
                if (byteArray == null)
                    byteArray = new byte[chunkSize];
                file.readFully(byteArray);
                if (parseLinesFromLast(byteArray, lineCount, lastNLines)) {
                    break; // we got the last *lineCount* lines
                }

                // move the current position
                currPos = startPos; // + lastLine.getBytes().length;
            }
        }

        // there might be lineCount + 1 lines and the first line (now it is the last line)
        // might not be complete
        for (int index = lineCount; index < lastNLines.size(); index++)
            lastNLines.removeElementAt(index);

        // reverse the order of elements in lastNLines
        Collections.reverse(lastNLines);
        return lastNLines;
    } catch (Exception e) {
        return null;
    }

}

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From source file:com.owncloud.android.utils.EncryptionUtils.java

/**
 * @param file               file do crypt
 * @param encryptionKeyBytes key, either from metadata or {@link EncryptionUtils#generateKey()}
 * @param iv                 initialization vector, either from metadata or {@link EncryptionUtils#randomBytes(int)}
 * @return encryptedFile with encryptedBytes and authenticationTag
 *///from  ww w .  j  a v a  2  s  . c  o  m
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public static EncryptedFile encryptFile(File file, byte[] encryptionKeyBytes, byte[] iv)
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchPaddingException,
        InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {

    Cipher cipher = Cipher.getInstance(AES_CIPHER);

    Key key = new SecretKeySpec(encryptionKeyBytes, AES);

    GCMParameterSpec spec = new GCMParameterSpec(128, iv);
    cipher.init(Cipher.ENCRYPT_MODE, key, spec);

    RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
    byte[] fileBytes = new byte[(int) randomAccessFile.length()];
    randomAccessFile.readFully(fileBytes);

    byte[] cryptedBytes = cipher.doFinal(fileBytes);
    String authenticationTag = encodeBytesToBase64String(
            Arrays.copyOfRange(cryptedBytes, cryptedBytes.length - (128 / 8), cryptedBytes.length));

    return new EncryptedFile(cryptedBytes, authenticationTag);
}

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From source file:com.owncloud.android.utils.EncryptionUtils.java

/**
 * @param file               encrypted file
 * @param encryptionKeyBytes key from metadata
 * @param iv                 initialization vector from metadata
 * @param authenticationTag  authenticationTag from metadata
 * @return decrypted byte[]/*from  w ww.  j  ava  2s . c om*/
 */
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public static byte[] decryptFile(File file, byte[] encryptionKeyBytes, byte[] iv, byte[] authenticationTag)
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchPaddingException,
        InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {

    Cipher cipher = Cipher.getInstance(AES_CIPHER);
    Key key = new SecretKeySpec(encryptionKeyBytes, AES);
    GCMParameterSpec spec = new GCMParameterSpec(128, iv);
    cipher.init(Cipher.DECRYPT_MODE, key, spec);

    RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
    byte[] fileBytes = new byte[(int) randomAccessFile.length()];
    randomAccessFile.readFully(fileBytes);

    // check authentication tag
    byte[] extractedAuthenticationTag = Arrays.copyOfRange(fileBytes, fileBytes.length - (128 / 8),
            fileBytes.length);

    if (!Arrays.equals(extractedAuthenticationTag, authenticationTag)) {
        throw new SecurityException("Tag not correct");
    }

    return cipher.doFinal(fileBytes);
}

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From source file:com.hdsfed.cometapi.HCPClient.java

/**
 * Copy the given byte range of the given input to the given output.
 * @param input The input to copy the given range to the given output for.
 * @param output The output to copy the given range from the given input for.
 * @param start Start of the byte range.
 * @param length Length of the byte range.
 * @throws IOException If something fails at I/O level.
 *//*from  w  w w .jav  a2s .  c  o m*/
public static void FileToOutputStream(RandomAccessFile input, OutputStream output, long start, long length)
        throws IOException {
    byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
    int read;

    if (input.length() == length) {
        // Write full range.
        while ((read = input.read(buffer)) > 0) {
            output.write(buffer, 0, read);
        }
    } else {
        // Write partial range.
        input.seek(start);
        long toRead = length;

        while ((read = input.read(buffer)) > 0) {
            if ((toRead -= read) > 0) {
                output.write(buffer, 0, read);
            } else {
                output.write(buffer, 0, (int) toRead + read);
                break;
            }
        }
    }
}

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From source file:net.naijatek.myalumni.util.utilities.FileUtil.java

public static String[] getLastLines(final File file, final int linesToReturn, final String logType)
        throws IOException, FileNotFoundException {

    final int AVERAGE_CHARS_PER_LINE = 250;
    final int BYTES_PER_CHAR = 2;

    RandomAccessFile randomAccessFile = null;
    StringBuffer buffer = new StringBuffer(linesToReturn * AVERAGE_CHARS_PER_LINE);
    int lineTotal = 0;
    try {// w ww .j  a  v a2  s.  c om
        randomAccessFile = new RandomAccessFile(file, "r");
        long byteTotal = randomAccessFile.length();
        long byteEstimateToRead = linesToReturn * AVERAGE_CHARS_PER_LINE * BYTES_PER_CHAR;

        long offset = byteTotal - byteEstimateToRead;
        if (offset < 0) {
            offset = 0;
        }

        randomAccessFile.seek(offset);
        //log.debug("SKIP IS ::" + offset);

        String line = null;
        String lineUTF8 = null;
        while ((line = randomAccessFile.readLine()) != null) {
            lineUTF8 = new String(line.getBytes("ISO8859_1"), "UTF-8");
            lineTotal++;
            buffer.append(lineUTF8).append("\n");
        }
    } finally {
        if (randomAccessFile != null) {
            try {
                randomAccessFile.close();
            } catch (IOException ex) {
            }
        }
    }

    //String[] resultLines = new String[linesToReturn];
    ArrayList<String> resultLines = new ArrayList<String>();
    BufferedReader in = null;
    try {
        in = new BufferedReader(new StringReader(buffer.toString()));

        int start = lineTotal /* + 2 */ - linesToReturn; // Ex : 55 - 10 = 45 ~ offset
        if (start < 0) {
            start = 0; // not start line
        }
        for (int i = 0; i < start; i++) {
            in.readLine(); // loop until the offset. Ex: loop 0, 1 ~~ 2 lines
        }

        int i = 0;
        String line = null;
        while ((line = in.readLine()) != null) {
            if (logType.equalsIgnoreCase("ALL")) {
                //resultLines[i] = line;
                resultLines.add(line);
                i++;
            } else if (line.indexOf(logType) > -1) {
                //resultLines[i] = line;
                resultLines.add(line);
                i++;
            }
        }
    } catch (IOException ie) {
        logger.error("Error" + ie);
        throw ie;
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (IOException ex) {
            }
        }
    }

    String[] resultLines1 = new String[resultLines.size()];
    String tmp = new String();
    for (int i = 0; i < resultLines.size(); i++) {
        tmp = (String) resultLines.get(i);
        resultLines1[i] = tmp;
    }

    return resultLines1;
}

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