286 lines
9.1 KiB
Java
286 lines
9.1 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl;
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import java.nio.*;
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/**
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* <p>A class to check buffer boundaries in general. If there is unsufficient space
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* in the buffer when the call is made then a buffer overflow would otherwise
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* occur and cause unexpected behaviour, a crash, or worse, a security risk.
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*
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* Internal class, don't use.
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* </p>
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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public class BufferChecks {
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/** Static methods only! */
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private BufferChecks() {
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}
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/**
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* Helper methods to ensure a function pointer is not-null (0)
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*/
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public static void checkFunctionAddress(long pointer) {
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if (LWJGLUtil.CHECKS && pointer == 0) {
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throw new IllegalStateException("Function is not supported");
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}
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}
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/**
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* Helper methods to ensure a ByteBuffer is null-terminated
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*/
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public static void checkNullTerminated(ByteBuffer buf) {
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if ( LWJGLUtil.CHECKS && buf.get(buf.limit() - 1) != 0) {
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throw new IllegalArgumentException("Missing null termination");
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}
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}
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public static void checkNullTerminated(ByteBuffer buf, int count) {
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if ( LWJGLUtil.CHECKS ) {
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int nullFound = 0;
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for ( int i = buf.position(); i < buf.limit(); i++ ) {
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if ( buf.get(i) == 0 )
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nullFound++;
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}
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if ( nullFound < count )
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throw new IllegalArgumentException("Missing null termination");
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}
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}
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/** Helper method to ensure an IntBuffer is null-terminated */
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public static void checkNullTerminated(IntBuffer buf) {
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if ( LWJGLUtil.CHECKS && buf.get(buf.limit() - 1) != 0 ) {
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throw new IllegalArgumentException("Missing null termination");
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}
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}
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/** Helper method to ensure a LongBuffer is null-terminated */
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public static void checkNullTerminated(LongBuffer buf) {
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if ( LWJGLUtil.CHECKS && buf.get(buf.limit() - 1) != 0 ) {
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throw new IllegalArgumentException("Missing null termination");
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}
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}
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/** Helper method to ensure a PointerBuffer is null-terminated */
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public static void checkNullTerminated(PointerBuffer buf) {
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if ( LWJGLUtil.CHECKS && buf.get(buf.limit() - 1) != 0 ) {
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throw new IllegalArgumentException("Missing null termination");
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}
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}
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public static void checkNotNull(Object o) {
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if ( LWJGLUtil.CHECKS && o == null)
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throw new IllegalArgumentException("Null argument");
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}
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/**
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* Helper methods to ensure a buffer is direct (and, implicitly, non-null).
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*/
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public static void checkDirect(ByteBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("ByteBuffer is not direct");
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}
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}
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public static void checkDirect(ShortBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("ShortBuffer is not direct");
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}
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}
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public static void checkDirect(IntBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("IntBuffer is not direct");
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}
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}
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public static void checkDirect(LongBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("LongBuffer is not direct");
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}
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}
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public static void checkDirect(FloatBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("FloatBuffer is not direct");
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}
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}
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public static void checkDirect(DoubleBuffer buf) {
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if ( LWJGLUtil.CHECKS && !buf.isDirect()) {
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throw new IllegalArgumentException("DoubleBuffer is not direct");
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}
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}
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public static void checkDirect(PointerBuffer buf) {
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// NO-OP, PointerBuffer is always direct.
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}
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public static void checkArray(Object[] array) {
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if ( LWJGLUtil.CHECKS && (array == null || array.length == 0) )
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throw new IllegalArgumentException("Invalid array");
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}
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/**
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* This is a separate call to help inline checkBufferSize.
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*/
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private static void throwBufferSizeException(Buffer buf, int size) {
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throw new IllegalArgumentException("Number of remaining buffer elements is " + buf.remaining() + ", must be at least " + size + ". Because at most " + size + " elements can be returned, a buffer with at least " + size + " elements is required, regardless of actual returned element count");
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}
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private static void throwBufferSizeException(PointerBuffer buf, int size) {
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throw new IllegalArgumentException("Number of remaining pointer buffer elements is " + buf.remaining() + ", must be at least " + size);
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}
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private static void throwArraySizeException(Object[] array, int size) {
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throw new IllegalArgumentException("Number of array elements is " + array.length + ", must be at least " + size);
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}
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private static void throwArraySizeException(long[] array, int size) {
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throw new IllegalArgumentException("Number of array elements is " + array.length + ", must be at least " + size);
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}
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/**
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* Helper method to ensure a buffer is big enough to receive data from a
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* glGet* operation.
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*
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* @param buf
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* The buffer to check
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* @param size
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* The minimum buffer size
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* @throws IllegalArgumentException
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*/
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public static void checkBufferSize(Buffer buf, int size) {
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if ( LWJGLUtil.CHECKS && buf.remaining() < size) {
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throwBufferSizeException(buf, size);
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}
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}
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/**
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* Detects the buffer type and performs the corresponding check
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* and also returns the buffer position in bytes.
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*
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* @param buffer the buffer to check
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* @param size the size to check
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*
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* @return the buffer position in bytes
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*/
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public static int checkBuffer(final Buffer buffer, final int size) {
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final int posShift;
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if ( buffer instanceof ByteBuffer ) {
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BufferChecks.checkBuffer((ByteBuffer)buffer, size);
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posShift = 0;
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} else if ( buffer instanceof ShortBuffer ) {
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BufferChecks.checkBuffer((ShortBuffer)buffer, size);
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posShift = 1;
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} else if ( buffer instanceof IntBuffer ) {
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BufferChecks.checkBuffer((IntBuffer)buffer, size);
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posShift = 2;
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} else if ( buffer instanceof LongBuffer ) {
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BufferChecks.checkBuffer((LongBuffer)buffer, size);
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posShift = 4;
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} else if ( buffer instanceof FloatBuffer ) {
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BufferChecks.checkBuffer((FloatBuffer)buffer, size);
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posShift = 2;
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} else if ( buffer instanceof DoubleBuffer ) {
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BufferChecks.checkBuffer((DoubleBuffer)buffer, size);
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posShift = 4;
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} else
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throw new IllegalArgumentException("Unsupported Buffer type specified: " + buffer.getClass());
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return buffer.position() << posShift;
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}
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public static void checkBuffer(ByteBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(ShortBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(IntBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(LongBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(FloatBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(DoubleBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS ) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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}
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public static void checkBuffer(PointerBuffer buf, int size) {
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if ( LWJGLUtil.CHECKS && buf.remaining() < size ) {
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throwBufferSizeException(buf, size);
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}
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}
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public static void checkArray(Object[] array, int size) {
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if ( LWJGLUtil.CHECKS && array.length < size )
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throwArraySizeException(array, size);
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}
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public static void checkArray(long[] array, int size) {
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if ( LWJGLUtil.CHECKS && array.length < size )
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throwArraySizeException(array, size);
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}
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} |