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/*
* Copyright (c) 2009-2012 Panxiaobo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.googlecode.dex2jar.reader.io;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Stack;
/**
*
* @author <a href="mailto:pxb1988@gmail.com">Panxiaobo</a>
* @version $Rev: 9fd8005bbaa4 $
*/
public abstract class ArrayDataIn extends ByteArrayInputStream implements DataIn {
private Stack<Integer> stack = new Stack<Integer>();
public ArrayDataIn(byte[] data) {
super(data);
}
@Override
public int readShortx() {
return (short) readUShortx();
}
@Override
public int readIntx() {
return readUIntx();
}
@Override
public int getCurrentPosition() {
return super.pos;
}
@Override
public void move(int absOffset) {
super.pos = absOffset;
}
@Override
public void pop() {
super.pos = stack.pop();
}
@Override
public void push() {
stack.push(super.pos);
}
@Override
public void pushMove(int absOffset) {
this.push();
this.move(absOffset);
}
@Override
public byte[] readBytes(int size) {
byte[] data = new byte[size];
try {
super.read(data);
} catch (IOException e) {
throw new RuntimeException(e);
}
return data;
}
@Override
public long readLeb128() {
int bitpos = 0;
long vln = 0L;
do {
int inp = readUByte();
vln |= ((long) (inp & 0x7F)) << bitpos;
bitpos += 7;
if ((inp & 0x80) == 0) {
break;
}
} while (true);
if (((1L << (bitpos - 1)) & vln) != 0) {
vln -= (1L << bitpos);
}
return vln;
}
@Override
public long readULeb128() {
long value = 0;
int count = 0;
int b = readUByte();
while ((b & 0x80) != 0) {
value |= (b & 0x7f) << count;
count += 7;
b = readUByte();
}
value |= (b & 0x7f) << count;
return value;
}
@Override
public void skip(int bytes) {
super.skip(bytes);
}
@Override
public int readByte() {
return (byte) readUByte();
}
@Override
public int readUByte() {
if (super.pos >= super.count) {
throw new RuntimeException("EOF");
}
return super.read();
}
}
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