/*
* 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.DataInput;
import java.io.IOException;
import java.util.Stack;
import com.googlecode.dex2jar.DexException;
public abstract class DataInputDataIn implements DataIn {
protected DataInput in;
private boolean isLE;
private Stack<Integer> stack = new Stack<Integer>();
public DataInputDataIn(DataInput in, boolean isLE) {
this.in = in;
this.isLE = isLE;
}
@Override
public void pop() {
move(stack.pop());
}
@Override
public void push() {
stack.push(getCurrentPosition());
}
@Override
public void pushMove(int absOffset) {
this.push();
this.move(absOffset);
}
@Override
public int readByte() {
try {
return in.readByte();
} catch (IOException e) {
throw new DexException(e);
}
}
@Override
public byte[] readBytes(int size) {
byte[] data = new byte[size];
try {
in.readFully(data);
} catch (IOException e) {
throw new DexException(e);
}
return data;
}
@Override
public int readIntx() {
return readUIntx();
}
@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 int readShortx() {
try {
return in.readShort();
} catch (IOException e) {
throw new DexException(e);
}
}
@Override
public int readUByte() {
try {
return in.readUnsignedByte();
} catch (IOException e) {
throw new DexException(e);
}
}
@Override
public int readUIntx() {
if (isLE) {
return readUByte() | (readUByte() << 8) | (readUByte() << 16) | (readUByte() << 24);
} else {
return (readUByte() << 24) | (readUByte() << 16) | (readUByte() << 8) | readUByte();
}
}
@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 int readUShortx() {
if (isLE) {
return readUByte() | (readUByte() << 8);
} else {
return (readUByte() << 8) | readUByte();
}
}
@Override
public void skip(int bytes) {
try {
in.skipBytes(bytes);
} catch (IOException e) {
throw new DexException(e);
}
}
}