/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */
package com.jogamp.gluegen.runtime;

import java.nio.*;

/**
 * @author Kenneth Russel
 * @author Sven Gothel
 * @author Michael Bien
 */
public class Buffers {

    public static final int SIZEOF_BYTE     = 1;
    public static final int SIZEOF_SHORT    = 2;
    public static final int SIZEOF_CHAR     = 2;
    public static final int SIZEOF_INT      = 4;
    public static final int SIZEOF_FLOAT    = 4;
    public static final int SIZEOF_LONG     = 8;
    public static final int SIZEOF_DOUBLE   = 8;

    protected Buffers() {}

    /**
     * Allocates a new direct ByteBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static ByteBuffer newDirectByteBuffer(int numElements) {
        return nativeOrder(ByteBuffer.allocateDirect(numElements));
    }

    public static ByteBuffer newDirectByteBuffer(byte[] values, int offset, int lenght) {
        return (ByteBuffer)newDirectByteBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static ByteBuffer newDirectByteBuffer(byte[] values, int offset) {
        return newDirectByteBuffer(values, offset, values.length-offset);
    }

    public static ByteBuffer newDirectByteBuffer(byte[] values) {
        return newDirectByteBuffer(values, 0);
    }

    /**
     * Allocates a new direct DoubleBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static DoubleBuffer newDirectDoubleBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_DOUBLE).asDoubleBuffer();
    }

    public static DoubleBuffer newDirectDoubleBuffer(double[] values, int offset, int lenght) {
        return (DoubleBuffer)newDirectDoubleBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static DoubleBuffer newDirectDoubleBuffer(double[] values, int offset) {
        return newDirectDoubleBuffer(values, offset, values.length - offset);
    }

    public static DoubleBuffer newDirectDoubleBuffer(double[] values) {
        return newDirectDoubleBuffer(values, 0);
    }

    /**
     * Allocates a new direct FloatBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static FloatBuffer newDirectFloatBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_FLOAT).asFloatBuffer();
    }

    public static FloatBuffer newDirectFloatBuffer(float[] values, int offset, int lenght) {
        return (FloatBuffer)newDirectFloatBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static FloatBuffer newDirectFloatBuffer(float[] values, int offset) {
        return newDirectFloatBuffer(values, offset, values.length - offset);
    }

    public static FloatBuffer newDirectFloatBuffer(float[] values) {
        return newDirectFloatBuffer(values, 0);
    }

    /**
     * Allocates a new direct IntBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static IntBuffer newDirectIntBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_INT).asIntBuffer();
    }

    public static IntBuffer newDirectIntBuffer(int[] values, int offset, int lenght) {
        return (IntBuffer)newDirectIntBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static IntBuffer newDirectIntBuffer(int[] values, int offset) {
        return newDirectIntBuffer(values, offset, values.length - offset);
    }

    public static IntBuffer newDirectIntBuffer(int[] values) {
        return newDirectIntBuffer(values, 0);
    }

    /**
     * Allocates a new direct LongBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static LongBuffer newDirectLongBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_LONG).asLongBuffer();
    }

    public static LongBuffer newDirectLongBuffer(long[] values, int offset, int lenght) {
        return (LongBuffer)newDirectLongBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static LongBuffer newDirectLongBuffer(long[] values, int offset) {
        return newDirectLongBuffer(values, offset, values.length - offset);
    }

    public static LongBuffer newDirectLongBuffer(long[] values) {
        return newDirectLongBuffer(values, 0);
    }

    /**
     * Allocates a new direct ShortBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static ShortBuffer newDirectShortBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_SHORT).asShortBuffer();
    }

    public static ShortBuffer newDirectShortBuffer(short[] values, int offset, int lenght) {
        return (ShortBuffer)newDirectShortBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static ShortBuffer newDirectShortBuffer(short[] values, int offset) {
        return newDirectShortBuffer(values, offset, values.length - offset);
    }

    public static ShortBuffer newDirectShortBuffer(short[] values) {
        return newDirectShortBuffer(values, 0);
    }

    /**
     * Allocates a new direct CharBuffer with the specified number of
     * elements. The returned buffer will have its byte order set to
     * the host platform's native byte order.
     */
    public static CharBuffer newDirectCharBuffer(int numElements) {
        return newDirectByteBuffer(numElements * SIZEOF_SHORT).asCharBuffer();
    }

    public static CharBuffer newDirectCharBuffer(char[] values, int offset, int lenght) {
        return (CharBuffer)newDirectCharBuffer(lenght).put(values, offset, lenght).rewind();
    }

    public static CharBuffer newDirectCharBuffer(char[] values, int offset) {
        return newDirectCharBuffer(values, offset, values.length - offset);
    }

    public static CharBuffer newDirectCharBuffer(char[] values) {
        return newDirectCharBuffer(values, 0);
    }

    /**
     * Helper routine to set a ByteBuffer to the native byte order, if
     * that operation is supported by the underlying NIO
     * implementation.
     */
    public static ByteBuffer nativeOrder(ByteBuffer buf) {
        if (Platform.isJavaSE()) {
            return buf.order(ByteOrder.nativeOrder());
        } else {
            // JSR 239 does not support the ByteOrder class or the order methods.
            // The initial order of a byte buffer is the platform byte order.
            return buf;
        }
    }

    /**
     * Returns the size of a single element of this buffer in bytes.
     */
    public static final int sizeOfBufferElem(Buffer buffer) {
        if (buffer == null) {
            return 0;
        }
        if (buffer instanceof ByteBuffer) {
            return SIZEOF_BYTE;
        } else if (buffer instanceof IntBuffer) {
            return SIZEOF_INT;
        } else if (buffer instanceof ShortBuffer) {
            return SIZEOF_SHORT;
        } else if (buffer instanceof FloatBuffer) {
            return SIZEOF_FLOAT;
        } else if (Platform.isJavaSE()) {
            if (buffer instanceof DoubleBuffer) {
                return SIZEOF_DOUBLE;
            } else if (buffer instanceof LongBuffer) {
                return SIZEOF_LONG;
            } else if (buffer instanceof CharBuffer) {
                return SIZEOF_CHAR;
            }
        }
        throw new RuntimeException("Unexpected buffer type " + buffer.getClass().getName());
    }

    /**
     * Helper routine to tell whether a buffer is direct or not. Null
     * pointers are considered NOT direct. isDirect() should really be
     * public in Buffer and not replicated in all subclasses.
     */
    public static boolean isDirect(Object buf) {
        if (buf == null) {
            return true;
        }
        if (buf instanceof ByteBuffer) {
            return ((ByteBuffer) buf).isDirect();
        } else if (buf instanceof FloatBuffer) {
            return ((FloatBuffer) buf).isDirect();
        } else if (buf instanceof IntBuffer) {
            return ((IntBuffer) buf).isDirect();
        } else if (buf instanceof ShortBuffer) {
            return ((ShortBuffer) buf).isDirect();
        } else if (buf instanceof PointerBuffer) {
            return ((PointerBuffer) buf).isDirect();
        } else if (Platform.isJavaSE()) {
            if (buf instanceof DoubleBuffer) {
                return ((DoubleBuffer) buf).isDirect();
            } else if (buf instanceof LongBuffer) {
                return ((LongBuffer) buf).isDirect();
            }else if (buf instanceof CharBuffer) {
                return ((CharBuffer) buf).isDirect();
            }
        }
        throw new RuntimeException("Unexpected buffer type " + buf.getClass().getName());
    }

    /**
     * Helper routine to get the Buffer byte offset by taking into
     * account the Buffer position and the underlying type.  This is
     * the total offset for Direct Buffers.
     */
    public static int getDirectBufferByteOffset(Object buf) {
        if (buf == null) {
            return 0;
        }
        if (buf instanceof Buffer) {
            int pos = ((Buffer) buf).position();
            if (buf instanceof ByteBuffer) {
                return pos;
            } else if (buf instanceof FloatBuffer) {
                return pos * SIZEOF_FLOAT;
            } else if (buf instanceof IntBuffer) {
                return pos * SIZEOF_INT;
            } else if (buf instanceof ShortBuffer) {
                return pos * SIZEOF_SHORT;
            }else if(Platform.isJavaSE()) {
                if (buf instanceof DoubleBuffer) {
                    return pos * SIZEOF_DOUBLE;
                } else if (buf instanceof LongBuffer) {
                    return pos * SIZEOF_LONG;
                } else if (buf instanceof CharBuffer) {
                    return pos * SIZEOF_CHAR;
                }
            }
        } else if (buf instanceof PointerBuffer) {
            PointerBuffer pointerBuffer = (PointerBuffer) buf;
            return pointerBuffer.position() * PointerBuffer.elementSize();
        }

        throw new RuntimeException("Disallowed array backing store type in buffer " + buf.getClass().getName());
    }

    /**
     * Helper routine to return the array backing store reference from
     * a Buffer object.
     */
    public static Object getArray(Object buf) {
        if (buf == null) {
            return null;
        }
        if (buf instanceof ByteBuffer) {
            return ((ByteBuffer) buf).array();
        } else if (buf instanceof FloatBuffer) {
            return ((FloatBuffer) buf).array();
        } else if (buf instanceof IntBuffer) {
            return ((IntBuffer) buf).array();
        } else if (buf instanceof ShortBuffer) {
            return ((ShortBuffer) buf).array();
        } else if (buf instanceof PointerBuffer) {
            return ((PointerBuffer) buf).array();
        }else if(Platform.isJavaSE()) {
            if (buf instanceof DoubleBuffer) {
                return ((DoubleBuffer) buf).array();
            } else if (buf instanceof LongBuffer) {
                return ((LongBuffer) buf).array();
            } else if (buf instanceof CharBuffer) {
                return ((CharBuffer) buf).array();
            }
        }

        throw new RuntimeException("Disallowed array backing store type in buffer " + buf.getClass().getName());
    }

    /**
     * Helper routine to get the full byte offset from the beginning of
     * the array that is the storage for the indirect Buffer
     * object.  The array offset also includes the position offset
     * within the buffer, in addition to any array offset.
     */
    public static int getIndirectBufferByteOffset(Object buf) {
        if (buf == null) {
            return 0;
        }
        if (buf instanceof Buffer) {
            int pos = ((Buffer) buf).position();
            if (buf instanceof ByteBuffer) {
                return (((ByteBuffer) buf).arrayOffset() + pos);
            } else if (buf instanceof FloatBuffer) {
                return (SIZEOF_FLOAT * (((FloatBuffer) buf).arrayOffset() + pos));
            } else if (buf instanceof IntBuffer) {
                return (SIZEOF_INT * (((IntBuffer) buf).arrayOffset() + pos));
            } else if (buf instanceof ShortBuffer) {
                return (SIZEOF_SHORT * (((ShortBuffer) buf).arrayOffset() + pos));
            }else if(Platform.isJavaSE()) {
                if (buf instanceof DoubleBuffer) {
                    return (SIZEOF_DOUBLE * (((DoubleBuffer) buf).arrayOffset() + pos));
                } else if (buf instanceof LongBuffer) {
                    return (SIZEOF_LONG * (((LongBuffer) buf).arrayOffset() + pos));
                } else if (buf instanceof CharBuffer) {
                    return (SIZEOF_CHAR * (((CharBuffer) buf).arrayOffset() + pos));
                }
            }
        } else if (buf instanceof PointerBuffer) {
            PointerBuffer pointerBuffer = (PointerBuffer) buf;
            return PointerBuffer.elementSize() * (pointerBuffer.arrayOffset() + pointerBuffer.position());
        }

        throw new RuntimeException("Unknown buffer type " + buf.getClass().getName());
    }


    //----------------------------------------------------------------------
    // Copy routines (type-to-type)
    //
    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed ByteBuffer into
     * a newly-allocated direct ByteBuffer. The returned buffer will
     * have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static ByteBuffer copyByteBuffer(ByteBuffer orig) {
        ByteBuffer dest = newDirectByteBuffer(orig.remaining());
        dest.put(orig);
        dest.rewind();
        return dest;
    }

    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed FloatBuffer
     * into a newly-allocated direct FloatBuffer. The returned buffer
     * will have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static FloatBuffer copyFloatBuffer(FloatBuffer orig) {
        return copyFloatBufferAsByteBuffer(orig).asFloatBuffer();
    }

    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed IntBuffer
     * into a newly-allocated direct IntBuffer. The returned buffer
     * will have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static IntBuffer copyIntBuffer(IntBuffer orig) {
        return copyIntBufferAsByteBuffer(orig).asIntBuffer();
    }

    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed ShortBuffer
     * into a newly-allocated direct ShortBuffer. The returned buffer
     * will have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static ShortBuffer copyShortBuffer(ShortBuffer orig) {
        return copyShortBufferAsByteBuffer(orig).asShortBuffer();
    }

    //----------------------------------------------------------------------
    // Copy routines (type-to-ByteBuffer)
    //
    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed FloatBuffer
     * into a newly-allocated direct ByteBuffer. The returned buffer
     * will have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static ByteBuffer copyFloatBufferAsByteBuffer(FloatBuffer orig) {
        ByteBuffer dest = newDirectByteBuffer(orig.remaining() * SIZEOF_FLOAT);
        dest.asFloatBuffer().put(orig);
        dest.rewind();
        return dest;
    }

    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed IntBuffer into
     * a newly-allocated direct ByteBuffer. The returned buffer will
     * have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static ByteBuffer copyIntBufferAsByteBuffer(IntBuffer orig) {
        ByteBuffer dest = newDirectByteBuffer(orig.remaining() * SIZEOF_INT);
        dest.asIntBuffer().put(orig);
        dest.rewind();
        return dest;
    }

    /**
     * Copies the <i>remaining</i> elements (as defined by
     * <code>limit() - position()</code>) in the passed ShortBuffer
     * into a newly-allocated direct ByteBuffer. The returned buffer
     * will have its byte order set to the host platform's native byte
     * order. The position of the newly-allocated buffer will be zero,
     * and the position of the passed buffer is unchanged (though its
     * mark is changed).
     */
    public static ByteBuffer copyShortBufferAsByteBuffer(ShortBuffer orig) {
        ByteBuffer dest = newDirectByteBuffer(orig.remaining() * SIZEOF_SHORT);
        dest.asShortBuffer().put(orig);
        dest.rewind();
        return dest;
    }

    //----------------------------------------------------------------------
    // Conversion routines
    //
    public final static FloatBuffer getFloatBuffer(DoubleBuffer source) {
        source.rewind();
        FloatBuffer dest = newDirectFloatBuffer(source.limit());
        while (source.hasRemaining()) {
            dest.put((float) source.get());
        }
        return dest;
    }

    //----------------------------------------------------------------------
    // Convenient put methods with generic target Buffer
    //
    public static Buffer put(Buffer dest, Buffer src) {
        if ((dest instanceof ByteBuffer) && (src instanceof ByteBuffer)) {
            return ((ByteBuffer) dest).put((ByteBuffer) src);
        } else if ((dest instanceof ShortBuffer) && (src instanceof ShortBuffer)) {
            return ((ShortBuffer) dest).put((ShortBuffer) src);
        } else if ((dest instanceof IntBuffer) && (src instanceof IntBuffer)) {
            return ((IntBuffer) dest).put((IntBuffer) src);
        } else if ((dest instanceof FloatBuffer) && (src instanceof FloatBuffer)) {
            return ((FloatBuffer) dest).put((FloatBuffer) src);
        } else if (Platform.isJavaSE()) {
            if ((dest instanceof LongBuffer) && (src instanceof LongBuffer)) {
                return ((LongBuffer) dest).put((LongBuffer) src);
            } else if ((dest instanceof DoubleBuffer) && (src instanceof DoubleBuffer)) {
                return ((DoubleBuffer) dest).put((DoubleBuffer) src);
            } else if ((dest instanceof CharBuffer) && (src instanceof CharBuffer)) {
                return ((CharBuffer) dest).put((CharBuffer) src);
            }
        }
        throw new RuntimeException("Incompatible Buffer classes: dest = " + dest.getClass().getName() + ", src = " + src.getClass().getName());
    }

    public static Buffer putb(Buffer dest, byte v) {
        if (dest instanceof ByteBuffer) {
            return ((ByteBuffer) dest).put(v);
        } else if (dest instanceof ShortBuffer) {
            return ((ShortBuffer) dest).put((short) v);
        } else if (dest instanceof IntBuffer) {
            return ((IntBuffer) dest).put((int) v);
        } else {
            throw new RuntimeException("Byte doesn't match Buffer Class: " + dest);
        }
    }

    public static Buffer puts(Buffer dest, short v) {
        if (dest instanceof ShortBuffer) {
            return ((ShortBuffer) dest).put(v);
        } else if (dest instanceof IntBuffer) {
            return ((IntBuffer) dest).put((int) v);
        } else {
            throw new RuntimeException("Short doesn't match Buffer Class: " + dest);
        }
    }

    public static void puti(Buffer dest, int v) {
        if (dest instanceof IntBuffer) {
            ((IntBuffer) dest).put(v);
        } else {
            throw new RuntimeException("Integer doesn't match Buffer Class: " + dest);
        }
    }

    public static void putf(Buffer dest, float v) {
        if (dest instanceof FloatBuffer) {
            ((FloatBuffer) dest).put(v);
/* TODO FixedPoint required
        } else if (dest instanceof IntBuffer) {
            ((IntBuffer) dest).put(FixedPoint.toFixed(v));
*/
        } else {
            throw new RuntimeException("Float doesn't match Buffer Class: " + dest);
        }
    }
    public static void putd(Buffer dest, double v) {
        if (dest instanceof FloatBuffer) {
            ((FloatBuffer) dest).put((float) v);
        } else {
            throw new RuntimeException("Double doesn't match Buffer Class: " + dest);
        }
    }

    public static void rangeCheck(byte[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(char[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(short[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(int[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(long[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(float[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(double[] array, int offset, int minElementsRemaining) {
        if (array == null) {
            return;
        }

        if (array.length < offset + minElementsRemaining) {
            throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
        }
    }

    public static void rangeCheck(Buffer buffer, int minElementsRemaining) {
        if (buffer == null) {
            return;
        }

        if (buffer.remaining() < minElementsRemaining) {
            throw new IndexOutOfBoundsException("Required " + minElementsRemaining + " remaining elements in buffer, only had " + buffer.remaining());
        }
    }

    public static void rangeCheckBytes(Object buffer, int minBytesRemaining) {
        if (buffer == null) {
            return;
        }

        int bytesRemaining = 0;
        if (buffer instanceof Buffer) {
            int elementsRemaining = ((Buffer) buffer).remaining();
            if (buffer instanceof ByteBuffer) {
                bytesRemaining = elementsRemaining;
            } else if (buffer instanceof FloatBuffer) {
                bytesRemaining = elementsRemaining * SIZEOF_FLOAT;
            } else if (buffer instanceof IntBuffer) {
                bytesRemaining = elementsRemaining * SIZEOF_INT;
            } else if (buffer instanceof ShortBuffer) {
                bytesRemaining = elementsRemaining * SIZEOF_SHORT;
            }else if(Platform.isJavaSE()) {
                if (buffer instanceof DoubleBuffer) {
                    bytesRemaining = elementsRemaining * SIZEOF_DOUBLE;
                } else if (buffer instanceof LongBuffer) {
                    bytesRemaining = elementsRemaining * SIZEOF_LONG;
                } else if (buffer instanceof CharBuffer) {
                    bytesRemaining = elementsRemaining * SIZEOF_CHAR;
                }
            }
        } else if (buffer instanceof PointerBuffer) {
            PointerBuffer pointerBuffer = (PointerBuffer) buffer;
            bytesRemaining = pointerBuffer.remaining() * PointerBuffer.elementSize();
        }
        if (bytesRemaining < minBytesRemaining) {
            throw new IndexOutOfBoundsException("Required " + minBytesRemaining + " remaining bytes in buffer, only had " + bytesRemaining);
        }
    }

}