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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.io.input;

import static org.apache.commons.io.IOUtils.EOF;

import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.EndianUtils;

/**
 * DataInput for systems relying on little endian data formats.
 * When read, values will be changed from little endian to big
 * endian formats for internal usage.
 * 

* Origin of code: Avalon Excalibur (IO) * */ public class SwappedDataInputStream extends ProxyInputStream implements DataInput { /** * Constructs a SwappedDataInputStream. * * @param input InputStream to read from */ public SwappedDataInputStream( final InputStream input ) { super( input ); } /** * Return {@link #readByte()} != 0 * @return false if the byte read is zero, otherwise true * @throws IOException if an I/O error occurs * @throws EOFException if an end of file is reached unexpectedly */ @Override public boolean readBoolean() throws IOException, EOFException { return 0 != readByte(); } /** * Invokes the delegate's read() method. * @return the byte read or -1 if the end of stream * @throws IOException if an I/O error occurs * @throws EOFException if an end of file is reached unexpectedly */ @Override public byte readByte() throws IOException, EOFException { return (byte)in.read(); } /** * Reads a character delegating to {@link #readShort()}. * @return the byte read or -1 if the end of stream * @throws IOException if an I/O error occurs * @throws EOFException if an end of file is reached unexpectedly */ @Override public char readChar() throws IOException, EOFException { return (char)readShort(); } /** * Delegates to {@link EndianUtils#readSwappedDouble(InputStream)}. * @return the read long * @throws IOException if an I/O error occurs * @throws EOFException if an end of file is reached unexpectedly */ @Override public double readDouble() throws IOException, EOFException { return EndianUtils.readSwappedDouble( in ); } /** * Delegates to {@link EndianUtils#readSwappedFloat(InputStream)}. * @return the read long * @throws IOException if an I/O error occurs * @throws EOFException if an end of file is reached unexpectedly */ @Override public float readFloat() throws IOException, EOFException { return EndianUtils.readSwappedFloat( in ); } /** * Invokes the delegate's read(byte[] data, int, int) method. * * @param data the buffer to read the bytes into * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public void readFully( final byte[] data ) throws IOException, EOFException { readFully( data, 0, data.length ); } /** * Invokes the delegate's read(byte[] data, int, int) method. * * @param data the buffer to read the bytes into * @param offset The start offset * @param length The number of bytes to read * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public void readFully( final byte[] data, final int offset, final int length ) throws IOException, EOFException { int remaining = length; while( remaining > 0 ) { final int location = offset + length - remaining; final int count = read( data, location, remaining ); if (EOF == count) { throw new EOFException(); } remaining -= count; } } /** * Delegates to {@link EndianUtils#readSwappedInteger(InputStream)}. * @return the read long * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public int readInt() throws IOException, EOFException { return EndianUtils.readSwappedInteger( in ); } /** * Not currently supported - throws {@link UnsupportedOperationException}. * @return the line read * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public String readLine() throws IOException, EOFException { throw new UnsupportedOperationException( "Operation not supported: readLine()" ); } /** * Delegates to {@link EndianUtils#readSwappedLong(InputStream)}. * @return the read long * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public long readLong() throws IOException, EOFException { return EndianUtils.readSwappedLong( in ); } /** * Delegates to {@link EndianUtils#readSwappedShort(InputStream)}. * @return the read long * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public short readShort() throws IOException, EOFException { return EndianUtils.readSwappedShort( in ); } /** * Invokes the delegate's read() method. * @return the byte read or -1 if the end of stream * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public int readUnsignedByte() throws IOException, EOFException { return in.read(); } /** * Delegates to {@link EndianUtils#readSwappedUnsignedShort(InputStream)}. * @return the read long * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public int readUnsignedShort() throws IOException, EOFException { return EndianUtils.readSwappedUnsignedShort( in ); } /** * Not currently supported - throws {@link UnsupportedOperationException}. * @return UTF String read * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public String readUTF() throws IOException, EOFException { throw new UnsupportedOperationException( "Operation not supported: readUTF()" ); } /** * Invokes the delegate's skip(int) method. * @param count the number of bytes to skip * @return the number of bytes to skipped or -1 if the end of stream * @throws EOFException if an end of file is reached unexpectedly * @throws IOException if an I/O error occurs */ @Override public int skipBytes( final int count ) throws IOException, EOFException { return (int)in.skip( count ); } }





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