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
17package libcore.io;
18
19import 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 */
27public 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