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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.modules.jffi;
import com.kenai.jffi.Platform;
class BoundedNativeMemory implements Memory, DirectMemory {
protected static final com.kenai.jffi.MemoryIO IO = com.kenai.jffi.MemoryIO.getInstance();
protected static final int LONG_SIZE = Platform.getPlatform().longSize();
protected static final int ADDRESS_SIZE = Platform.getPlatform().addressSize();
final long address;
final long size;
final BoundedNativeMemory parent; // keep a reference to avoid the memory being freed
BoundedNativeMemory(long address, int size) {
this.address = address;
this.size = size;
this.parent = null;
}
private BoundedNativeMemory(BoundedNativeMemory parent, long offset) {
this.address = parent.address + offset;
this.size = parent.size - offset;
this.parent = parent;
}
private final void checkBounds(long off, long len) {
Util.checkBounds(size, off, len);
}
public final long getAddress() {
return address;
}
public BoundedNativeMemory slice(long offset) {
checkBounds(offset, 1);
return offset == 0 ? this :new BoundedNativeMemory(this, offset);
}
@Override
public final boolean equals(Object obj) {
return (obj instanceof DirectMemory) && ((DirectMemory) obj).getAddress() == address;
}
@Override
public final int hashCode() {
int hash = 5;
hash = 53 * hash + (int) (this.address ^ (this.address >>> 32));
return hash;
}
public final boolean isNull() {
return address == 0;
}
public final boolean isDirect() {
return true;
}
public final byte getByte(long offset) {
checkBounds(offset, 1);
return IO.getByte(address + offset);
}
public final short getShort(long offset) {
checkBounds(offset, 2);
return IO.getShort(address + offset);
}
public final int getInt(long offset) {
checkBounds(offset, 4);
return IO.getInt(address + offset);
}
public final long getLong(long offset) {
checkBounds(offset, 8);
return IO.getLong(address + offset);
}
public final long getNativeLong(long offset) {
return LONG_SIZE == 32 ? getInt(offset) : getLong(offset);
}
public final float getFloat(long offset) {
checkBounds(offset, 4);
return IO.getFloat(address + offset);
}
public final double getDouble(long offset) {
checkBounds(offset, 8);
return IO.getDouble(address + offset);
}
public final long getAddress(long offset) {
checkBounds(offset, ADDRESS_SIZE >> 3);
return IO.getAddress(address + offset);
}
public final DirectMemory getMemory(long offset) {
checkBounds(offset, ADDRESS_SIZE >> 3);
final long ptr = IO.getAddress(address + offset);
return ptr != 0 ? new NativeMemory(ptr) : null;
}
public final byte[] getZeroTerminatedByteArray(long offset) {
checkBounds(offset, 1);
return IO.getZeroTerminatedByteArray(address + offset, (int) (size - offset));
}
public void putZeroTerminatedByteArray(long offset, byte[] bytes, int off, int len) {
// Ensure room for terminating zero byte
checkBounds(offset, len + 1);
IO.putZeroTerminatedByteArray(address + offset, bytes, off, len);
}
public final void putByte(long offset, byte value) {
checkBounds(offset, 1);
IO.putByte(address + offset, value);
}
public final void putShort(long offset, short value) {
checkBounds(offset, 2);
IO.putShort(address + offset, value);
}
public final void putInt(long offset, int value) {
checkBounds(offset, 4);
IO.putInt(address + offset, value);
}
public final void putLong(long offset, long value) {
checkBounds(offset, 8);
IO.putLong(address + offset, value);
}
public final void putNativeLong(long offset, long value) {
if (LONG_SIZE == 32) {
putInt(offset, (int) value);
} else {
putLong(offset, value);
}
}
public final void putAddress(long offset, long value) {
checkBounds(offset, ADDRESS_SIZE >> 3);
IO.putAddress(address + offset, value);
}
public final void putFloat(long offset, float value) {
checkBounds(offset, 4);
IO.putFloat(address + offset, value);
}
public final void putDouble(long offset, double value) {
checkBounds(offset, 8);
IO.putDouble(address + offset, value);
}
public final void putAddress(long offset, Memory value) {
checkBounds(offset, ADDRESS_SIZE >> 3);
IO.putAddress(address + offset, ((DirectMemory) value).getAddress());
}
public final void get(long offset, byte[] dst, int off, int len) {
checkBounds(offset, len);
IO.getByteArray(address + offset, dst, off, len);
}
public final void put(long offset, byte[] src, int off, int len) {
checkBounds(offset, len);
IO.putByteArray(address + offset, src, off, len);
}
public final void get(long offset, short[] dst, int off, int len) {
checkBounds(offset, len << 1);
IO.getShortArray(address + offset, dst, off, len);
}
public final void put(long offset, short[] src, int off, int len) {
checkBounds(offset, len << 1);
IO.putShortArray(address + offset, src, off, len);
}
public final void get(long offset, int[] dst, int off, int len) {
checkBounds(offset, len << 2);
IO.getIntArray(address + offset, dst, off, len);
}
public final void put(long offset, int[] src, int off, int len) {
checkBounds(offset, len << 2);
IO.putIntArray(address + offset, src, off, len);
}
public final void get(long offset, long[] dst, int off, int len) {
checkBounds(offset, len << 3);
IO.getLongArray(address + offset, dst, off, len);
}
public final void put(long offset, long[] src, int off, int len) {
checkBounds(offset, len << 3);
IO.putLongArray(address + offset, src, off, len);
}
public final void get(long offset, float[] dst, int off, int len) {
checkBounds(offset, len << 2);
IO.getFloatArray(address + offset, dst, off, len);
}
public final void put(long offset, float[] src, int off, int len) {
checkBounds(offset, len << 2);
IO.putFloatArray(address + offset, src, off, len);
}
public final void get(long offset, double[] dst, int off, int len) {
checkBounds(offset, len << 3);
IO.getDoubleArray(address + offset, dst, off, len);
}
public final void put(long offset, double[] src, int off, int len) {
checkBounds(offset, len << 3);
IO.putDoubleArray(address + offset, src, off, len);
}
public final int indexOf(long offset, byte value) {
return value == 0
? (int) IO.getStringLength(address + offset)
: (int) IO.indexOf(address + offset, value);
}
public final int indexOf(long offset, byte value, int maxlen) {
return (int) IO.indexOf(address, value, maxlen);
}
public final void setMemory(long offset, long size, byte value) {
checkBounds(offset, size);
IO.setMemory(address + offset, size, value);
}
}