DoubleEncodedValue.java revision 4d68e05fb5e3262c58bc9896befe910698daa6a8 
1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2009 Ben Gruver
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29package org.jf.dexlib.EncodedValue;
30
31import org.jf.dexlib.Util.Input;
32import org.jf.dexlib.Util.EncodedValueUtils;
33import org.jf.dexlib.Util.AnnotatedOutput;
34
35public class DoubleEncodedValue extends EncodedValue {
36    public final double value;
37
38    /**
39     * Constructs a new <code>DoubleEncodedValue</code> by reading the value from the given <code>Input</code> object.
40     * The <code>Input</code>'s cursor should be set to the 2nd byte of the encoded value, and the high 3 bits of
41     * the first byte should be passed as the valueArg parameter
42     * @param in The <code>Input</code> object to read from
43     * @param valueArg The high 3 bits of the first byte of this encoded value
44     */
45    protected DoubleEncodedValue(Input in, byte valueArg) {
46        long longValue = EncodedValueUtils.decodeRightZeroExtendedValue(in.readBytes(valueArg + 1));
47        value = Double.longBitsToDouble(longValue);
48    }
49
50    /**
51     * Constructs a new <code>DoubleEncodedValue</code> with the given value
52     * @param value The value
53     */
54    public DoubleEncodedValue(double value) {
55        this.value = value;
56    }
57
58    /** {@inheritDoc} */
59    public void writeValue(AnnotatedOutput out) {
60        byte[] bytes = EncodedValueUtils.encodeRightZeroExtendedValue(Double.doubleToRawLongBits(value));
61
62        if (out.annotates()) {
63            out.annotate(1, "value_type=" + ValueType.VALUE_DOUBLE.name() + ",value_arg=" + (bytes.length - 1));
64            out.annotate(bytes.length, "value: " + value);
65        }
66
67        out.writeByte(ValueType.VALUE_DOUBLE.value | ((bytes.length - 1) << 5));
68        out.write(bytes);
69    }
70
71    /** {@inheritDoc} */
72    public int placeValue(int offset) {
73        return offset + 1 + EncodedValueUtils.getRequiredBytesForRightZeroExtendedValue(
74                 Double.doubleToRawLongBits(value));
75    }
76
77    /** {@inheritDoc} */
78    protected int compareValue(EncodedValue o) {
79        DoubleEncodedValue other = (DoubleEncodedValue)o;
80
81        return Double.compare(value, other.value);
82    }
83
84    /** {@inheritDoc} */
85    public ValueType getValueType() {
86        return ValueType.VALUE_DOUBLE;
87    }
88
89    @Override
90    public int hashCode() {
91        return (int)Double.doubleToRawLongBits(value);
92    }
93}
94
95