Java Utililty Methods ByteBuffer Copy

List of utility methods to do ByteBuffer Copy

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Description

The list of methods to do ByteBuffer Copy are organized into topic(s).

Method

voidcopyByteBuffer(ByteBuffer srcBuf, int srcStep, ByteBuffer dstBuf, int dstStep)
copy Byte Buffer 
assert srcBuf != dstBuf;
int channels = 3;
int w = Math.min(srcStep, dstStep);
int srcLine = srcBuf.position(), dstLine = dstBuf.position();
byte[] buffer = new byte[channels];
while (srcLine < srcBuf.capacity() && dstLine < dstBuf.capacity()) {
    srcBuf.position(srcLine);
    dstBuf.position(dstLine);
...
ByteBuffercopyByteBuffer(final ByteBuffer pBuffer)
Clone a byte buffer. 
if (pBuffer.isDirect()) {
    throw new IllegalArgumentException("direct buffers not supported");
final ByteBuffer buffer = ByteBuffer.allocate(pBuffer.limit());
buffer.order(pBuffer.order());
buffer.put(pBuffer.array());
buffer.position(pBuffer.position());
return buffer;
...
java.nio.ByteBuffercopyByteBuffer(java.nio.ByteBuffer data)
copy Byte Buffer 
if (data == null) {
    return null;
java.nio.ByteBuffer buf = createDirectByteBuffer(convertByteBufferToArray(data));
return buf;
byte[]copyBytes(ByteBuffer bytes)
Extract the bytes in the given ByteBuffer and return it as a byte[] without affecting the mark, position, or limit of the given buffer. 
ByteBuffer copy = bytes.duplicate();
byte[] result = new byte[copy.remaining()]; 
copy.get(result);
return result;
intcopyBytes(ByteBuffer src, ByteBuffer dst, int length)
Copies data from src buffer to dst buffer using their current positions as offsets. 
int retVal = copyBytes(src, src.position(), dst, dst.position(), length);
src.position(src.position() + retVal);
dst.position(dst.position() + retVal);
return retVal;
byte[]copyBytesFrom(ByteBuffer bb)
Returns a copy of the bytes from the given ByteBuffer, ranging from the the buffer's current position to the buffer's limit; or null if the input is null. 
if (bb == null) {
    return null;
if (bb.hasArray()) {
    return Arrays.copyOfRange(bb.array(), bb.arrayOffset() + bb.position(), bb.arrayOffset() + bb.limit());
byte[] dst = new byte[bb.remaining()];
bb.asReadOnlyBuffer().get(dst);
...
byte[]copyContentsToArray(ByteBuffer src)
Copy the remaining content of a ByteBuffer in to a new array. 
return copyContentsToArray(src, true);
voidcopyFileByMappedByteBuffer(String srcFileName, String dstFileName)
copy File By Mapped Byte Buffer 
FileChannel inFileChannel = new RandomAccessFile(srcFileName, "r").getChannel();
FileChannel outFileChannel = new RandomAccessFile(dstFileName, "rw").getChannel();
try {
    long fileSize = inFileChannel.size();
    long position = 0;
    while (position < fileSize) {
        long copyFileSize = Math.min((fileSize - position), COPY_FILE_SIZE);
        MappedByteBuffer mappedByteBuffer = outFileChannel.map(MapMode.READ_WRITE, position, copyFileSize);
...
voidcopyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length)
Copy from one buffer to another from given offset. 
if (in.hasArray() && out.hasArray()) {
    System.arraycopy(in.array(), sourceOffset + in.arrayOffset(), out.array(),
            out.position() + out.arrayOffset(), length);
    skip(out, length);
} else {
    for (int i = 0; i < length; ++i) {
        out.put(in.get(sourceOffset + i));
voidcopyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length)
Copy from one buffer to another from given offset 
if (in.hasArray() && out.hasArray()) {
    System.arraycopy(in.array(), sourceOffset + in.arrayOffset(), out.array(),
            out.position() + out.arrayOffset(), length);
    skip(out, length);
} else {
    for (int i = 0; i < length; ++i) {
        out.put(in.get(sourceOffset + i));