net.jpountz.util.ByteBufferUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of lz4 Show documentation

Java ports and bindings of the LZ4 compression algorithm and the xxHash hashing algorithm

The newest version!

package net.jpountz.util;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ReadOnlyBufferException;

public enum ByteBufferUtils {
  ;

  public static void checkRange(ByteBuffer buf, int off, int len) {
    SafeUtils.checkLength(len);
    if (len > 0) {
      checkRange(buf, off);
      checkRange(buf, off + len - 1);
    }
  }

  public static void checkRange(ByteBuffer buf, int off) {
    if (off < 0 || off >= buf.capacity()) {
      throw new ArrayIndexOutOfBoundsException(off);
    }
  }

  public static ByteBuffer inLittleEndianOrder(ByteBuffer buf) {
    if (buf.order().equals(ByteOrder.LITTLE_ENDIAN)) {
      return buf;
    } else {
      return buf.duplicate().order(ByteOrder.LITTLE_ENDIAN);
    }
  }

  public static ByteBuffer inNativeByteOrder(ByteBuffer buf) {
    if (buf.order().equals(Utils.NATIVE_BYTE_ORDER)) {
      return buf;
    } else {
      return buf.duplicate().order(Utils.NATIVE_BYTE_ORDER);
    }
  }

  public static byte readByte(ByteBuffer buf, int i) {
    return buf.get(i);
  }

  public static void writeInt(ByteBuffer buf, int i, int v) {
    assert buf.order() == Utils.NATIVE_BYTE_ORDER;
    buf.putInt(i, v);
  }

  public static int readInt(ByteBuffer buf, int i) {
    assert buf.order() == Utils.NATIVE_BYTE_ORDER;
    return buf.getInt(i);
  }

  public static int readIntLE(ByteBuffer buf, int i) {
    assert buf.order() == ByteOrder.LITTLE_ENDIAN;
    return buf.getInt(i);
  }

  public static void writeLong(ByteBuffer buf, int i, long v) {
    assert buf.order() == Utils.NATIVE_BYTE_ORDER;
    buf.putLong(i, v);
  }

  public static long readLong(ByteBuffer buf, int i) {
    assert buf.order() == Utils.NATIVE_BYTE_ORDER;
    return buf.getLong(i);
  }

  public static long readLongLE(ByteBuffer buf, int i) {
    assert buf.order() == ByteOrder.LITTLE_ENDIAN;
    return buf.getLong(i);
  }

  public static void writeByte(ByteBuffer dest, int off, int i) {
    dest.put(off, (byte) i);
  }

  public static void writeShortLE(ByteBuffer dest, int off, int i) {
    dest.put(off, (byte) i);
    dest.put(off + 1, (byte) (i >>> 8));
  }

  public static void checkNotReadOnly(ByteBuffer buffer) {
    if (buffer.isReadOnly()) {
      throw new ReadOnlyBufferException();
    }
  }

  public static int readShortLE(ByteBuffer buf, int i) {
    return (buf.get(i) & 0xFF) | ((buf.get(i+1) & 0xFF) << 8);
  }
}