1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package libcore.io; 18 19 import libcore.io.Memory; 20 21 /** 22 * Iterates over big- or little-endian bytes on the native heap. 23 * See {@link MemoryMappedFile#bigEndianIterator} and {@link MemoryMappedFile#littleEndianIterator}. 24 * 25 * @hide don't make this public without adding bounds checking. 26 */ 27 public final class NioBufferIterator extends BufferIterator { 28 private final long address; 29 private final int size; 30 private final boolean swap; 31 32 private int position; 33 34 NioBufferIterator(long address, int size, boolean swap) { 35 this.address = address; 36 this.size = size; 37 this.swap = swap; 38 } 39 40 public void seek(int offset) { 41 position = offset; 42 } 43 44 public void skip(int byteCount) { 45 position += byteCount; 46 } 47 48 public void readByteArray(byte[] dst, int dstOffset, int byteCount) { 49 Memory.peekByteArray(address + position, dst, dstOffset, byteCount); 50 position += byteCount; 51 } 52 53 public byte readByte() { 54 byte result = Memory.peekByte(address + position); 55 ++position; 56 return result; 57 } 58 59 public int readInt() { 60 int result = Memory.peekInt(address + position, swap); 61 position += SizeOf.INT; 62 return result; 63 } 64 65 public void readIntArray(int[] dst, int dstOffset, int intCount) { 66 Memory.peekIntArray(address + position, dst, dstOffset, intCount, swap); 67 position += SizeOf.INT * intCount; 68 } 69 70 public short readShort() { 71 short result = Memory.peekShort(address + position, swap); 72 position += SizeOf.SHORT; 73 return result; 74 } 75 } 76
