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/*
* Copyright (C) 2014 RoboVM AB
*
* 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 com.bugvm.rt.bro.ptr;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.LongBuffer;
import java.util.Arrays;
import com.bugvm.rt.VM;
import com.bugvm.rt.bro.Struct;
import com.bugvm.rt.bro.annotation.MachineSizedSInt;
import com.bugvm.rt.bro.annotation.StructMember;
/**
* Points to a 32-bit or 64-bit signed value depending on the machine word
* size (long * in C).
*/
public final class MachineSizedSIntPtr extends Struct {
/**
* Pointer to {@link MachineSizedSIntPtr} (long ** in C)
*/
public static class MachineSizedSIntPtrPtr extends com.bugvm.rt.bro.ptr.Ptr {}
/**
* Creates a new {@link MachineSizedSIntPtr} with a value of 0.
*/
public MachineSizedSIntPtr() {
}
/**
* Returns the current value.
*
* @return the value.
*/
@StructMember(0)
public native @MachineSizedSInt long get();
/**
* Sets the value.
*
* @param value the new value.
*/
@StructMember(0)
public native void set(@MachineSizedSInt long value);
/**
* Returns a {@link IntBuffer} which reads and writes to the same memory
* location pointed to by this {@link MachineSizedSIntPtr}. Must only be
* called on 32-bit platforms.
*
* @param n the maximum number of ints the {@link IntBuffer} can
* read/write. This will be the {@link IntBuffer}'s
* capacity.
* @return the {@link IntBuffer}.
* @throws IllegalStateException if this isn't a 32-bit platform.
*/
public IntBuffer asIntBuffer(int n) {
if (_sizeOf() != 4) {
throw new IllegalStateException("Not a 32-bit platform");
}
return VM.newDirectByteBuffer(getHandle(), n << 2)
.order(ByteOrder.nativeOrder()).asIntBuffer();
}
/**
* Returns a {@link LongBuffer} which reads and writes to the same memory
* location pointed to by this {@link MachineSizedSIntPtr}. Must only be
* called on 64-bit platforms.
*
* @param n the maximum number of longs the {@link LongBuffer} can
* read/write. This will be the {@link LongBuffer}'s
* capacity.
* @return the {@link LongBuffer}.
* @throws IllegalStateException if this isn't a 64-bit platform.
*/
public LongBuffer asLongBuffer(int n) {
if (_sizeOf() != 8) {
throw new IllegalStateException("Not a 64-bit platform");
}
return VM.newDirectByteBuffer(getHandle(), n << 3)
.order(ByteOrder.nativeOrder()).asLongBuffer();
}
/**
* Copies {@code n} ints from the memory pointed to by this
* {@link MachineSizedSIntPtr} to a new {@code int[]} instance. Does the
* proper narrowing {@code long} to {@code int} conversion if running on a 64-bit
* platform.
*
* @param n the number of ints to copy.
* @return the {@code int[]}.
*/
public int[] toIntArray(int n) {
int[] result = new int[n];
get(result);
return result;
}
/**
* Copies {@code dst.length} ints from the memory pointed to by this
* {@link MachineSizedSIntPtr} to {@code dst}. Does the proper
* narrowing {@code long} to {@code int} conversion if running on a 64-bit
* platform.
*
* @param dst the destination.
*/
public void get(int[] dst) {
get(dst, 0, dst.length);
}
/**
* Copies {@code count} ints from the memory pointed to by this
* {@link MachineSizedSIntPtr} to {@code dst} starting at offset {@code offset}.
* Does the proper narrowing {@code long} to {@code int} conversion if running on
* a 64-bit platform.
*
* @param dst the destination.
* @param offset the offset within the destination array to start copying to.
* @param count the number of elements to copy.
*/
public void get(int[] dst, int offset, int count) {
if (_sizeOf() == 4) {
asIntBuffer(count).get(dst, offset, count);
} else {
Arrays.checkOffsetAndCount(dst.length, offset, count);
LongBuffer buf = asLongBuffer(count);
for (int i = 0; i < count; i++) {
dst[i + offset] = (int) buf.get();
}
}
}
/**
* Copies {@code src.length} ints from {@code src} to the memory pointed
* to by this {@link MachineSizedSIntPtr}. Does signed
* {@code int} to {@code long} conversion if running on a 64-bit platform.
*
* @param src the source.
*/
public void set(int[] src) {
set(src, 0, src.length);
}
/**
* Copies {@code count} ints from {@code src} starting at offset {@code offset}
* to the memory pointed to by this {@link MachineSizedSIntPtr}. Does
* signed {@code int} to {@code long} conversion if running on a 64-bit
* platform.
*
* @param src the source.
* @param offset the offset within the source array to start copying from.
* @param count the number of elements to copy.
*/
public void set(int[] src, int offset, int count) {
if (_sizeOf() == 4) {
asIntBuffer(count).put(src, offset, count);
} else {
Arrays.checkOffsetAndCount(src.length, offset, count);
LongBuffer buf = asLongBuffer(count);
for (int i = 0; i < count; i++) {
buf.put(src[i + offset]);
}
}
}
/**
* Copies {@code n} longs from the memory pointed to by this
* {@link MachineSizedSIntPtr} to a new {@code long[]} instance. Does
* signed {@code int} to {@code long} conversion if running on a 32-bit
* platform.
*
* @param n the number of longs to copy.
* @return the {@code long[]}.
*/
public long[] toLongArray(int n) {
long[] result = new long[n];
get(result);
return result;
}
/**
* Copies {@code dst.length} longs from the memory pointed to by this
* {@link MachineSizedSIntPtr} to {@code dst}. Does signed {@code int} to
* {@code long} conversion if running on a 32-bit platform.
*
* @param dst the destination.
*/
public void get(long[] dst) {
get(dst, 0, dst.length);
}
/**
* Copies {@code count} longs from the memory pointed to by this
* {@link MachineSizedSIntPtr} to {@code dst} starting at offset {@code offset}.
* Does signed {@code int} to {@code long} conversion if running on
* a 32-bit platform.
*
* @param dst the destination.
* @param offset the offset within the destination array to start copying to.
* @param count the number of elements to copy.
*/
public void get(long[] dst, int offset, int count) {
if (_sizeOf() == 8) {
asLongBuffer(count).get(dst, offset, count);
} else {
Arrays.checkOffsetAndCount(dst.length, offset, count);
IntBuffer buf = asIntBuffer(count);
for (int i = 0; i < count; i++) {
dst[i + offset] = buf.get();
}
}
}
/**
* Copies {@code src.length} longs from {@code src} to the memory pointed
* to by this {@link MachineSizedSIntPtr}.
* Does the proper narrowing {@code long} to {@code int} conversion if running on
* a 32-bit platform.
*
* @param src the source.
*/
public void set(long[] src) {
set(src, 0, src.length);
}
/**
* Copies {@code count} longs from {@code src} starting at offset {@code offset}
* to the memory pointed to by this {@link MachineSizedSIntPtr}.
* Does the proper narrowing {@code long} to {@code int} conversion if running on
* a 32-bit platform.
*
* @param src the source.
* @param offset the offset within the source array to start copying from.
* @param count the number of elements to copy.
*/
public void set(long[] src, int offset, int count) {
if (_sizeOf() == 8) {
asLongBuffer(count).put(src, offset, count);
} else {
Arrays.checkOffsetAndCount(src.length, offset, count);
IntBuffer buf = asIntBuffer(count);
for (int i = 0; i < count; i++) {
buf.put((int) src[i + offset]);
}
}
}
}
