1/*
2 * Copyright (C) 2013 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.inputmethod.latin.utils;
18
19import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
20
21/**
22 * This class provides an implementation for the FusionDictionary buffer interface that is backed
23 * by a simpled byte array. It allows to create a binary dictionary in memory.
24 */
25public final class ByteArrayDictBuffer implements DictBuffer {
26    private byte[] mBuffer;
27    private int mPosition;
28
29    public ByteArrayDictBuffer(final byte[] buffer) {
30        mBuffer = buffer;
31        mPosition = 0;
32    }
33
34    @Override
35    public int readUnsignedByte() {
36        return mBuffer[mPosition++] & 0xFF;
37    }
38
39    @Override
40    public int readUnsignedShort() {
41        final int retval = readUnsignedByte();
42        return (retval << 8) + readUnsignedByte();
43    }
44
45    @Override
46    public int readUnsignedInt24() {
47        final int retval = readUnsignedShort();
48        return (retval << 8) + readUnsignedByte();
49    }
50
51    @Override
52    public int readInt() {
53        final int retval = readUnsignedShort();
54        return (retval << 16) + readUnsignedShort();
55    }
56
57    @Override
58    public int position() {
59        return mPosition;
60    }
61
62    @Override
63    public void position(int position) {
64        mPosition = position;
65    }
66
67    @Override
68    public void put(final byte b) {
69        mBuffer[mPosition++] = b;
70    }
71
72    @Override
73    public int limit() {
74        return mBuffer.length - 1;
75    }
76
77    @Override
78    public int capacity() {
79        return mBuffer.length;
80    }
81}
82