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A library for invoking native functions from java
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/*
* Copyright (C) 2008-2010 Wayne Meissner
*
* This file is part of the JNR project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jnr.ffi.provider;
import jnr.ffi.Address;
import jnr.ffi.Pointer;
import java.nio.charset.Charset;
public final class BoundedMemoryIO extends AbstractMemoryIO implements DelegatingMemoryIO {
private final long base, size;
private final Pointer io;
public BoundedMemoryIO(Pointer parent, long offset, long size) {
super(parent.getRuntime(), parent.address() != 0L ? parent.address() + offset : 0L, parent.isDirect());
this.io = parent;
this.base = offset;
this.size = size;
}
public long size() {
return this.size;
}
@Override
public final boolean hasArray() {
return io.hasArray();
}
@Override
public final Object array() {
return io.array();
}
@Override
public final int arrayOffset() {
return io.arrayOffset() + (int) base;
}
@Override
public final int arrayLength() {
return (int) size;
}
@Override
public void checkBounds(long offset, long length) {
checkBounds(this.size, offset, length);
getDelegatedMemoryIO().checkBounds(base + offset, length);
}
public Pointer getDelegatedMemoryIO() {
return io;
}
@Override
public int hashCode() {
return getDelegatedMemoryIO().hashCode();
}
@Override
public boolean equals(Object obj) {
return (obj instanceof BoundedMemoryIO && io.equals(((BoundedMemoryIO) obj).io) &&
((BoundedMemoryIO) obj).base == base && ((BoundedMemoryIO) obj).size == size)
|| io.equals(obj);
}
@Override
public byte getByte(long offset) {
checkBounds(size, offset, 1);
return io.getByte(base + offset);
}
@Override
public short getShort(long offset) {
checkBounds(size, offset, 2);
return io.getShort(base + offset);
}
@Override
public int getInt(long offset) {
checkBounds(size, offset, 4);
return io.getInt(base + offset);
}
@Override
public long getLongLong(long offset) {
checkBounds(size, offset, 8);
return io.getLongLong(base + offset);
}
@Override
public float getFloat(long offset) {
checkBounds(size, offset, 4);
return io.getFloat(base + offset);
}
@Override
public double getDouble(long offset) {
checkBounds(size, offset, 8);
return io.getDouble(base + offset);
}
public Pointer getPointer(long offset) {
checkBounds(size, offset, getRuntime().addressSize());
return io.getPointer(base + offset);
}
public Pointer getPointer(long offset, long size) {
checkBounds(this.size, base + offset, getRuntime().addressSize());
return io.getPointer(base + offset, size);
}
@Override
public void putByte(long offset, byte value) {
checkBounds(size, offset, 1);
io.putByte(base + offset, value);
}
@Override
public void putShort(long offset, short value) {
checkBounds(size, offset, 2);
io.putShort(base + offset, value);
}
@Override
public void putInt(long offset, int value) {
checkBounds(size, offset, 4);
io.putInt(base + offset, value);
}
@Override
public void putLongLong(long offset, long value) {
checkBounds(size, offset, 8);
io.putLongLong(base + offset, value);
}
@Override
public void putFloat(long offset, float value) {
checkBounds(size, offset, 4);
io.putFloat(base + offset, value);
}
@Override
public void putDouble(long offset, double value) {
checkBounds(size, offset, 8);
io.putDouble(base + offset, value);
}
public void putPointer(long offset, Pointer value) {
checkBounds(size, offset, getRuntime().addressSize());
io.putPointer(base + offset, value);
}
@Override
public void get(long offset, byte[] dst, int off, int len) {
checkBounds(size, offset, len);
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, byte[] dst, int off, int len) {
checkBounds(size, offset, len);
io.put(base + offset, dst, off, len);
}
@Override
public void get(long offset, short[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Short.SIZE / 8));
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, short[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Short.SIZE / 8));
io.put(base + offset, dst, off, len);
}
@Override
public void get(long offset, int[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Integer.SIZE / 8));
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, int[] src, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Integer.SIZE / 8));
io.put(base + offset, src, off, len);
}
@Override
public void get(long offset, long[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Long.SIZE / 8));
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, long[] src, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Long.SIZE / 8));
io.put(base + offset, src, off, len);
}
@Override
public void get(long offset, float[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Float.SIZE / 8));
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, float[] src, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Float.SIZE / 8));
io.put(base + offset, src, off, len);
}
@Override
public void get(long offset, double[] dst, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Double.SIZE / 8));
io.get(base + offset, dst, off, len);
}
@Override
public void put(long offset, double[] src, int off, int len) {
checkBounds(size, offset, Math.multiplyExact(len, Double.SIZE / 8));
io.put(base + offset, src, off, len);
}
@Override
public long getAddress(long offset) {
checkBounds(size, offset, getRuntime().addressSize());
return io.getAddress(base + offset);
}
@Override
public String getString(long offset, int maxLength, Charset cs) {
checkBounds(size, offset, maxLength);
return io.getString(base + offset, maxLength, cs);
}
@Override
public String getString(long offset) {
return io.getString(base + offset, (int) size, Charset.defaultCharset());
}
@Override
public void putAddress(long offset, long value) {
checkBounds(size, offset, getRuntime().addressSize());
io.putAddress(base + offset, value);
}
@Override
public void putAddress(long offset, Address value) {
checkBounds(size, offset, getRuntime().addressSize());
io.putAddress(base + offset, value);
}
@Override
public void putString(long offset, String string, int maxLength, Charset cs) {
checkBounds(size, offset, maxLength);
io.putString(base + offset, string, maxLength, cs);
}
@Override
public int indexOf(long offset, byte value) {
return io.indexOf(base + offset, value, (int) size);
}
@Override
public int indexOf(long offset, byte value, int maxlen) {
checkBounds(size, offset, maxlen);
return io.indexOf(base + offset, value, maxlen);
}
@Override
public void setMemory(long offset, long size, byte value) {
checkBounds(this.size, base + offset, size);
io.setMemory(base + offset, size, value);
}
@Override
public void transferFrom(long offset, Pointer other, long otherOffset, long count) {
checkBounds(this.size, base + offset, count);
getDelegatedMemoryIO().transferFrom(offset, other, otherOffset, count);
}
@Override
public void transferTo(long offset, Pointer other, long otherOffset, long count) {
checkBounds(this.size, base + offset, count);
getDelegatedMemoryIO().transferTo(offset, other, otherOffset, count);
}
}