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/*
* Copyright 2008 Android4ME
*
* 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 android.content.res;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
/**
* @author Dmitry Skiba
*
* Simple helper class that allows reading of integers.
*
* TODO:
* * implement buffering
*
*/
public final class IntReader {
public IntReader() {
}
public IntReader(InputStream stream,boolean bigEndian) {
reset(stream,bigEndian);
}
public final void reset(InputStream stream,boolean bigEndian) {
m_stream=stream;
m_bigEndian=bigEndian;
m_position=0;
}
public final void close() {
if (m_stream==null) {
return;
}
try {
m_stream.close();
}
catch (IOException e) {
}
reset(null,false);
}
public final InputStream getStream() {
return m_stream;
}
public final boolean isBigEndian() {
return m_bigEndian;
}
public final void setBigEndian(boolean bigEndian) {
m_bigEndian=bigEndian;
}
public final int readByte() throws IOException {
return readInt(1);
}
public final int readShort() throws IOException {
return readInt(2);
}
public final int readInt() throws IOException {
return readInt(4);
}
public final int readInt(int length) throws IOException {
if (length<0 || length>4) {
throw new IllegalArgumentException();
}
int result=0;
if (m_bigEndian) {
for (int i=(length-1)*8;i>=0;i-=8) {
int b=m_stream.read();
if (b==-1) {
throw new EOFException();
}
m_position+=1;
result|=(b<<i);
}
} else {
length*=8;
for (int i=0;i!=length;i+=8) {
int b=m_stream.read();
if (b==-1) {
throw new EOFException();
}
m_position+=1;
result|=(b<<i);
}
}
return result;
}
public final int[] readIntArray(int length) throws IOException {
int[] array=new int[length];
readIntArray(array,0,length);
return array;
}
public final void readIntArray(int[] array,int offset,int length) throws IOException {
for (;length>0;length-=1) {
array[offset++]=readInt();
}
}
public final byte[] readByteArray(int length) throws IOException {
byte[] array=new byte[length];
int read=m_stream.read(array);
m_position+=read;
if (read!=length) {
throw new EOFException();
}
return array;
}
public final void skip(int bytes) throws IOException {
if (bytes<=0) {
return;
}
long skipped=m_stream.skip(bytes);
m_position+=skipped;
if (skipped!=bytes) {
throw new EOFException();
}
}
public final void skipInt() throws IOException {
skip(4);
}
public final int available() throws IOException {
return m_stream.available();
}
public final int getPosition() {
return m_position;
}
/////////////////////////////////// data
private InputStream m_stream;
private boolean m_bigEndian;
private int m_position;
}
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