1/*
2 * Copyright (C) 2014 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 com.android.layoutlib.bridge.libcore.io;
18
19import java.nio.ByteBuffer;
20
21import libcore.io.BufferIterator;
22
23/**
24 * Provides an implementation of {@link BufferIterator} over a {@link ByteBuffer}.
25 */
26public class BridgeBufferIterator extends BufferIterator {
27
28    private final long mSize;
29    private final ByteBuffer mByteBuffer;
30
31    public BridgeBufferIterator(long size, ByteBuffer buffer) {
32        mSize = size;
33        mByteBuffer = buffer;
34    }
35
36    @Override
37    public void seek(int offset) {
38        assert offset <= mSize;
39        mByteBuffer.position(offset);
40    }
41
42    @Override
43    public int pos() {
44        return mByteBuffer.position();
45    }
46
47    @Override
48    public void skip(int byteCount) {
49        int newPosition = mByteBuffer.position() + byteCount;
50        assert newPosition <= mSize;
51        mByteBuffer.position(newPosition);
52    }
53
54    @Override
55    public void readByteArray(byte[] dst, int dstOffset, int byteCount) {
56        assert dst.length >= dstOffset + byteCount;
57        mByteBuffer.get(dst, dstOffset, byteCount);
58    }
59
60    @Override
61    public byte readByte() {
62        return mByteBuffer.get();
63    }
64
65    @Override
66    public int readInt() {
67        return mByteBuffer.getInt();
68    }
69
70    @Override
71    public void readIntArray(int[] dst, int dstOffset, int intCount) {
72        while (--intCount >= 0) {
73            dst[dstOffset++] = mByteBuffer.getInt();
74        }
75    }
76
77    @Override
78    public short readShort() {
79        return mByteBuffer.getShort();
80    }
81}
82