|
Commons IO example source code file (SwappedDataInputStream.java)
The Commons IO SwappedDataInputStream.java source code/* * 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 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. * <p> * <b>Origin of code: Avalon Excalibur (IO) * * @author <a href="mailto:peter@apache.org">Peter Donald * @version CVS $Revision: 995160 $ $Date: 2010-09-08 18:15:52 +0100 (Wed, 08 Sep 2010) $ */ public class SwappedDataInputStream extends ProxyInputStream implements DataInput { /** * Constructs a SwappedDataInputStream. * * @param input InputStream to read from */ public SwappedDataInputStream( InputStream input ) { super( input ); } /** * Return <code>{@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 */ public boolean readBoolean() throws IOException, EOFException { return ( 0 != readByte() ); } /** * Invokes the delegate's <code>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 */ 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 */ 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 */ 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 */ public float readFloat() throws IOException, EOFException { return EndianUtils.readSwappedFloat( in ); } /** * Invokes the delegate's <code>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 */ public void readFully( byte[] data ) throws IOException, EOFException { readFully( data, 0, data.length ); } /** * Invokes the delegate's <code>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 */ public void readFully( byte[] data, int offset, int length ) throws IOException, EOFException { int remaining = length; while( remaining > 0 ) { int location = offset + ( length - remaining ); int count = read( data, location, remaining ); if( -1 == 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 */ 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 */ 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 */ 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 */ public short readShort() throws IOException, EOFException { return EndianUtils.readSwappedShort( in ); } /** * Invokes the delegate's <code>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 */ 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 */ 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 */ public String readUTF() throws IOException, EOFException { throw new UnsupportedOperationException( "Operation not supported: readUTF()" ); } /** * Invokes the delegate's <code>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 */ public int skipBytes( int count ) throws IOException, EOFException { return (int)in.skip( count ); } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO SwappedDataInputStream.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.