| /* |
| * 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. |
| * <p> |
| * <b>Origin of code: </b>Avalon Excalibur (IO) |
| * </p> |
| * |
| */ |
| public class SwappedDataInputStream extends ProxyInputStream implements DataInput { |
| |
| /** |
| * Constructs a SwappedDataInputStream. |
| * |
| * @param input InputStream to read from |
| */ |
| public SwappedDataInputStream(final InputStream input) { |
| super(input); |
| } |
| |
| /** |
| * Return <code>{@link #readByte()} != 0</code> |
| * |
| * @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 {@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 |
| */ |
| @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 {@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. |
| */ |
| @Override |
| public void readFully(final 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. |
| */ |
| @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 UnsupportedOperationExceptions.method("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 {@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. |
| */ |
| @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 UnsupportedOperationExceptions.method("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. |
| */ |
| @Override |
| public int skipBytes(final int count) throws IOException, EOFException { |
| return (int) in.skip(count); |
| } |
| |
| } |