| /* |
| * 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); |
| } |
| } |