/*
* Copyright 2008 Android4ME
* Copyright (C) 2012 Sony Mobile Communications AB
*
* 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 andreflect.xml;
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;
}