1/* 2 * [The "BSD licence"] 3 * Copyright (c) 2010 Ben Gruver (JesusFreke) 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.AnnotatedOutput; 32import org.jf.dexlib.Util.EncodedValueUtils; 33import org.jf.dexlib.Util.Input; 34 35public class FloatEncodedValue extends EncodedValue { 36 public final float value; 37 38 /** 39 * Constructs a new <code>FloatEncodedValue</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 FloatEncodedValue(Input in, byte valueArg) { 46 long longValue = EncodedValueUtils.decodeRightZeroExtendedValue(in.readBytes(valueArg + 1)); 47 value = Float.intBitsToFloat((int)((longValue >> 32) & 0xFFFFFFFFL)); 48 } 49 50 /** 51 * Constructs a new <code>FloatEncodedValue</code> with the given value 52 * @param value The value 53 */ 54 public FloatEncodedValue(float value) { 55 this.value = value; 56 } 57 58 /** {@inheritDoc} */ 59 public void writeValue(AnnotatedOutput out) { 60 byte[] bytes = EncodedValueUtils.encodeRightZeroExtendedValue(((long)Float.floatToRawIntBits(value)) << 32); 61 62 if (out.annotates()) { 63 out.annotate(1, "value_type=" + ValueType.VALUE_FLOAT.name() + ",value_arg=" + (bytes.length - 1)); 64 out.annotate(bytes.length, "value: " + value); 65 } 66 67 out.writeByte(ValueType.VALUE_FLOAT.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 ((long)Float.floatToRawIntBits(value)) << 32); 75 } 76 77 /** {@inheritDoc} */ 78 protected int compareValue(EncodedValue o) { 79 FloatEncodedValue other = (FloatEncodedValue)o; 80 81 return Float.compare(value, other.value); 82 } 83 84 /** {@inheritDoc} */ 85 public ValueType getValueType() { 86 return ValueType.VALUE_FLOAT; 87 } 88 89 @Override 90 public int hashCode() { 91 return Float.floatToRawIntBits(value); 92 } 93} 94