179 lines
5.2 KiB
Java
179 lines
5.2 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.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.DoubleBuffer;
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import java.nio.FloatBuffer;
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import java.nio.IntBuffer;
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import java.nio.ShortBuffer;
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import java.nio.LongBuffer;
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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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* Default buffer size for most buffer checks.
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*/
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private static final int DEFAULT_BUFFER_SIZE = 4;
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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 (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 (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 (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 (!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 (!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 (!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 (!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 (!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 (!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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/**
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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);
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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 (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 checkBuffer(ByteBuffer buf, int size) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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public static void checkBuffer(ShortBuffer buf, int size) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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public static void checkBuffer(IntBuffer buf, int size) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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public static void checkBuffer(LongBuffer buf, int size) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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public static void checkBuffer(FloatBuffer buf, int size) {
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checkBufferSize(buf, size);
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checkDirect(buf);
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}
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public static void checkBuffer(DoubleBuffer buf, int size) {
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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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