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/*
* Copyright (C) 2010 The Android Open Source 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 libcore.io;
import java.nio.ByteOrder;
import libcore.io.Memory;
/**
* Iterates over big- or little-endian bytes in a Java byte[].
*
* @hide don't make this public without adding bounds checking.
*/
public final class HeapBufferIterator extends BufferIterator {
private final byte[] buffer;
private final int offset;
private final int byteCount;
private final ByteOrder order;
private int position;
HeapBufferIterator(byte[] buffer, int offset, int byteCount, ByteOrder order) {
this.buffer = buffer;
this.offset = offset;
this.byteCount = byteCount;
this.order = order;
}
public void seek(int offset) {
position = offset;
}
public void skip(int byteCount) {
position += byteCount;
}
public void readByteArray(byte[] dst, int dstOffset, int byteCount) {
System.arraycopy(buffer, offset + position, dst, dstOffset, byteCount);
position += byteCount;
}
public byte readByte() {
byte result = buffer[offset + position];
++position;
return result;
}
public int readInt() {
int result = Memory.peekInt(buffer, offset + position, order);
position += SizeOf.INT;
return result;
}
public void readIntArray(int[] dst, int dstOffset, int intCount) {
final int byteCount = intCount * SizeOf.INT;
Memory.unsafeBulkGet(dst, dstOffset, byteCount, buffer, offset + position, SizeOf.INT, order.needsSwap);
position += byteCount;
}
public short readShort() {
short result = Memory.peekShort(buffer, offset + position, order);
position += SizeOf.SHORT;
return result;
}
/**
* Returns a new iterator over {@code buffer}, starting at {@code offset} and continuing for
* {@code byteCount} bytes. Items larger than a byte are interpreted using the given byte order.
*/
public static BufferIterator iterator(byte[] buffer, int offset, int byteCount, ByteOrder order) {
return new HeapBufferIterator(buffer, offset, byteCount, order);
}
}
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