Examples with FileChannel java.nio.channels.FileChannel used on opensource projects

Example 86 with FileChannel

use of java.nio.channels.FileChannel in project platform_frameworks_base by android.

the class Hyphenator method loadHyphenator.

private static Hyphenator loadHyphenator(String languageTag) {
    String patternFilename = "hyph-" + languageTag.toLowerCase(Locale.US) + ".hyb";
    File patternFile = new File(getSystemHyphenatorLocation(), patternFilename);
    try {
        RandomAccessFile f = new RandomAccessFile(patternFile, "r");
        try {
            FileChannel fc = f.getChannel();
            MappedByteBuffer buf = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            long nativePtr = StaticLayout.nLoadHyphenator(buf, 0);
            return new Hyphenator(nativePtr, buf);
        } finally {
            f.close();
        }
    } catch (IOException e) {
        Log.e(TAG, "error loading hyphenation " + patternFile, e);
        return null;
    }
}

Example 87 with FileChannel

use of java.nio.channels.FileChannel in project cassandra by apache.

the class EncryptionUtilsTest method fullRoundTrip.

@Test
public void fullRoundTrip() throws IOException, BadPaddingException, ShortBufferException, IllegalBlockSizeException {
    // compress
    byte[] buf = new byte[(1 << 12) - 7];
    random.nextBytes(buf);
    ByteBuffer compressedBuffer = EncryptionUtils.compress(ByteBuffer.wrap(buf), ByteBuffer.allocate(0), true, compressor);
    // encrypt
    CipherFactory cipherFactory = new CipherFactory(tdeOptions);
    Cipher encryptor = cipherFactory.getEncryptor(tdeOptions.cipher, tdeOptions.key_alias);
    File f = File.createTempFile("commitlog-enc-utils-", ".tmp");
    f.deleteOnExit();
    FileChannel channel = new RandomAccessFile(f, "rw").getChannel();
    EncryptionUtils.encryptAndWrite(compressedBuffer, channel, true, encryptor);
    // decrypt
    Cipher decryptor = cipherFactory.getDecryptor(tdeOptions.cipher, tdeOptions.key_alias, encryptor.getIV());
    ByteBuffer decryptedBuffer = EncryptionUtils.decrypt(RandomAccessReader.open(f), ByteBuffer.allocate(0), true, decryptor);
    // uncompress
    ByteBuffer uncompressedBuffer = EncryptionUtils.uncompress(decryptedBuffer, ByteBuffer.allocate(0), true, compressor);
    Assert.assertArrayEquals(buf, uncompressedBuffer.array());
}

Example 88 with FileChannel

use of java.nio.channels.FileChannel in project cassandra by apache.

the class EncryptionUtilsTest method encrypt.

@Test
public void encrypt() throws BadPaddingException, ShortBufferException, IllegalBlockSizeException, IOException {
    byte[] buf = new byte[(1 << 12) - 7];
    random.nextBytes(buf);
    // encrypt
    CipherFactory cipherFactory = new CipherFactory(tdeOptions);
    Cipher encryptor = cipherFactory.getEncryptor(tdeOptions.cipher, tdeOptions.key_alias);
    File f = File.createTempFile("commitlog-enc-utils-", ".tmp");
    f.deleteOnExit();
    FileChannel channel = new RandomAccessFile(f, "rw").getChannel();
    EncryptionUtils.encryptAndWrite(ByteBuffer.wrap(buf), channel, true, encryptor);
    channel.close();
    // decrypt
    Cipher decryptor = cipherFactory.getDecryptor(tdeOptions.cipher, tdeOptions.key_alias, encryptor.getIV());
    ByteBuffer decryptedBuffer = EncryptionUtils.decrypt(RandomAccessReader.open(f), ByteBuffer.allocate(0), true, decryptor);
    // normally, we'd just call BB.array(), but that gives you the *entire* backing array, not with any of the offsets (position,limit) applied.
    // thus, just for this test, we copy the array and perform an array-level comparison with those offsets
    decryptedBuffer.limit(buf.length);
    byte[] b = new byte[buf.length];
    System.arraycopy(decryptedBuffer.array(), 0, b, 0, buf.length);
    Assert.assertArrayEquals(buf, b);
}

Example 89 with FileChannel

use of java.nio.channels.FileChannel in project cordova-android by apache.

the class CordovaResourceApi method copyResource.

// Copies the input to the output in the most efficient manner possible.
// Closes both streams.
public void copyResource(OpenForReadResult input, OutputStream outputStream) throws IOException {
    assertBackgroundThread();
    try {
        InputStream inputStream = input.inputStream;
        if (inputStream instanceof FileInputStream && outputStream instanceof FileOutputStream) {
            FileChannel inChannel = ((FileInputStream) input.inputStream).getChannel();
            FileChannel outChannel = ((FileOutputStream) outputStream).getChannel();
            long offset = 0;
            long length = input.length;
            if (input.assetFd != null) {
                offset = input.assetFd.getStartOffset();
            }
            // transferFrom()'s 2nd arg is a relative position. Need to set the absolute
            // position first.
            inChannel.position(offset);
            outChannel.transferFrom(inChannel, 0, length);
        } else {
            final int BUFFER_SIZE = 8192;
            byte[] buffer = new byte[BUFFER_SIZE];
            for (; ; ) {
                int bytesRead = inputStream.read(buffer, 0, BUFFER_SIZE);
                if (bytesRead <= 0) {
                    break;
                }
                outputStream.write(buffer, 0, bytesRead);
            }
        }
    } finally {
        input.inputStream.close();
        if (outputStream != null) {
            outputStream.close();
        }
    }
}

Example 90 with FileChannel

use of java.nio.channels.FileChannel in project cassandra by apache.

the class HintsWriter method create.

// HintsWriter owns channel
@SuppressWarnings("resource")
static HintsWriter create(File directory, HintsDescriptor descriptor) throws IOException {
    File file = new File(directory, descriptor.fileName());
    FileChannel channel = FileChannel.open(file.toPath(), StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW);
    int fd = CLibrary.getfd(channel);
    CRC32 crc = new CRC32();
    try (DataOutputBuffer dob = DataOutputBuffer.scratchBuffer.get()) {
        // write the descriptor
        descriptor.serialize(dob);
        ByteBuffer descriptorBytes = dob.buffer();
        updateChecksum(crc, descriptorBytes);
        channel.write(descriptorBytes);
    } catch (Throwable e) {
        channel.close();
        throw e;
    }
    if (descriptor.isEncrypted())
        return new EncryptedHintsWriter(directory, descriptor, file, channel, fd, crc);
    if (descriptor.isCompressed())
        return new CompressedHintsWriter(directory, descriptor, file, channel, fd, crc);
    return new HintsWriter(directory, descriptor, file, channel, fd, crc);
}