1/*
2 * Copyright (c) 2009-2010 jMonkeyEngine
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 *   may be used to endorse or promote products derived from this software
18 *   without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32package com.jme3.util;
33
34import java.io.*;
35
36/**
37 * <code>LittleEndien</code> is a class to read littleendien stored data
38 * via a InputStream.  All functions work as defined in DataInput, but
39 * assume they come from a LittleEndien input stream.  Currently used to read .ms3d and .3ds files.
40 * @author Jack Lindamood
41 */
42public class LittleEndien extends InputStream implements DataInput {
43
44    private BufferedInputStream in;
45    private BufferedReader inRead;
46
47    /**
48     * Creates a new LittleEndien reader from the given input stream.  The
49     * stream is wrapped in a BufferedReader automatically.
50     * @param in The input stream to read from.
51     */
52    public LittleEndien(InputStream in) {
53        this.in = new BufferedInputStream(in);
54        inRead = new BufferedReader(new InputStreamReader(in));
55    }
56
57    public int read() throws IOException {
58        return in.read();
59    }
60
61    @Override
62    public int read(byte[] buf) throws IOException {
63        return in.read(buf);
64    }
65
66    @Override
67    public int read(byte[] buf, int off, int len) throws IOException {
68        return in.read(buf, off, len);
69    }
70
71    public int readUnsignedShort() throws IOException {
72        return (in.read() & 0xff) | ((in.read() & 0xff) << 8);
73    }
74
75    /**
76     * read an unsigned int as a long
77     */
78    public long readUInt() throws IOException {
79        return ((in.read() & 0xff)
80                | ((in.read() & 0xff) << 8)
81                | ((in.read() & 0xff) << 16)
82                | (((long) (in.read() & 0xff)) << 24));
83    }
84
85    public boolean readBoolean() throws IOException {
86        return (in.read() != 0);
87    }
88
89    public byte readByte() throws IOException {
90        return (byte) in.read();
91    }
92
93    public int readUnsignedByte() throws IOException {
94        return in.read();
95    }
96
97    public short readShort() throws IOException {
98        return (short) this.readUnsignedShort();
99    }
100
101    public char readChar() throws IOException {
102        return (char) this.readUnsignedShort();
103    }
104
105    public int readInt() throws IOException {
106        return ((in.read() & 0xff)
107                | ((in.read() & 0xff) << 8)
108                | ((in.read() & 0xff) << 16)
109                | ((in.read() & 0xff) << 24));
110    }
111
112    public long readLong() throws IOException {
113        return ((in.read() & 0xff)
114                | ((long) (in.read() & 0xff) << 8)
115                | ((long) (in.read() & 0xff) << 16)
116                | ((long) (in.read() & 0xff) << 24)
117                | ((long) (in.read() & 0xff) << 32)
118                | ((long) (in.read() & 0xff) << 40)
119                | ((long) (in.read() & 0xff) << 48)
120                | ((long) (in.read() & 0xff) << 56));
121    }
122
123    public float readFloat() throws IOException {
124        return Float.intBitsToFloat(readInt());
125    }
126
127    public double readDouble() throws IOException {
128        return Double.longBitsToDouble(readLong());
129    }
130
131    public void readFully(byte b[]) throws IOException {
132        in.read(b, 0, b.length);
133    }
134
135    public void readFully(byte b[], int off, int len) throws IOException {
136        in.read(b, off, len);
137    }
138
139    public int skipBytes(int n) throws IOException {
140        return (int) in.skip(n);
141    }
142
143    public String readLine() throws IOException {
144        return inRead.readLine();
145    }
146
147    public String readUTF() throws IOException {
148        throw new IOException("Unsupported operation");
149    }
150
151    @Override
152    public void close() throws IOException {
153        in.close();
154    }
155
156    @Override
157    public int available() throws IOException {
158        return in.available();
159    }
160}
161