Java Utililty Methods File Write via ByteBuffer

List of utility methods to do File Write via ByteBuffer

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File Write via ByteBuffer

Description

The list of methods to do File Write via ByteBuffer are organized into topic(s).

Method

MappedByteBuffer mmap(File file, long offset, long length, boolean writeable)
mmap

FileChannel chan = channel(file, writeable);
FileChannel.MapMode mode = writeable ? FileChannel.MapMode.READ_WRITE : FileChannel.MapMode.READ_ONLY;
MappedByteBuffer buf = chan.map(mode, offset, length);
chan.close();
return buf;

ByteBuffer newWriteableBuffer(int capacity)
new Writeable Buffer

ByteBuffer newBuffer = ByteBuffer.allocate(capacity);
return newBuffer;

void write(File file, String content, String encoding)
write

FileChannel channel = new FileOutputStream(file).getChannel();
try {
 channel.write(ByteBuffer.wrap(content.getBytes(encoding)));
} finally {
 channel.close();

void write(InputStream source, File target)
Writes an InputStream to disk.

RandomAccessFile file = new RandomAccessFile(target, "rw");
FileChannel channel = null;
FileLock lock = null;
try {
 channel = file.getChannel();
 lock = channel.lock();
 ByteBuffer buffer = ByteBuffer.allocate(1024);
 byte[] bytes = buffer.array();
...

void write(Path file, String content)
write

writeBytes(file, utf8(content));

void write(SeekableByteChannel channel, long start, byte[] bytes)
write

channel.position(start);
ByteBuffer buffer = ByteBuffer.wrap(bytes);
while (buffer.hasRemaining()) {
 channel.write(buffer);

byte[] write24BitInteger(int integer, ByteOrder order)
write Bit Integer

ByteBuffer tmp = ByteBuffer.allocate(4);
tmp.order(order);
tmp.putInt(integer);
if (order == ByteOrder.BIG_ENDIAN) {
 return subArray(tmp.array(), 1, 4);
} else if (order == ByteOrder.LITTLE_ENDIAN) {
 return subArray(tmp.array(), 0, 3);
throw new UnsupportedOperationException("Unknown ByteOrder " + order);

void writeByte(WritableByteChannel channel, byte value)
write Byte

channel.write((ByteBuffer) ByteBuffer.allocate(1).put(value).flip());

int writeBytes(Path file, byte[] bytes)
Writes bytes to a path

FileChannel channel = FileChannel.open(file, EnumSet.of(StandardOpenOption.CREATE,
 StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE));
ByteBuffer buffer = ByteBuffer.wrap(bytes);
channel.force(false);
int bytesWritten = channel.write(buffer);
channel.close();
return bytesWritten;

void writeComment(File zipFile, String comment)
write Comment

byte[] data = comment.getBytes("utf-8");
final RandomAccessFile raf = new RandomAccessFile(zipFile, "rw");
raf.seek(zipFile.length() - 2);
writeShort(data.length + 2 + COMMENT_SIGN.length, raf);
writeBytes(data, raf);
writeShort(data.length, raf);
writeBytes(COMMENT_SIGN, raf);
raf.close();
...