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https://github.com/moparisthebest/k-9
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490 lines
18 KiB
Java
490 lines
18 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.io;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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/**
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* Utility code for dealing with different endian systems.
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* <p>
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* Different computer architectures adopt different conventions for
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* byte ordering. In so-called "Little Endian" architectures (eg Intel),
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* the low-order byte is stored in memory at the lowest address, and
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* subsequent bytes at higher addresses. For "Big Endian" architectures
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* (eg Motorola), the situation is reversed.
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* This class helps you solve this incompatability.
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* <p>
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* Origin of code: Excalibur
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*
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* @author <a href="mailto:peter@apache.org">Peter Donald</a>
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* @version $Id: EndianUtils.java 539632 2007-05-18 23:37:59Z bayard $
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* @see org.apache.commons.io.input.SwappedDataInputStream
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*/
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public class EndianUtils {
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/**
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* Instances should NOT be constructed in standard programming.
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*/
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public EndianUtils() {
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super();
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}
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// ========================================== Swapping routines
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/**
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* Converts a "short" value between endian systems.
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* @param value value to convert
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* @return the converted value
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*/
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public static short swapShort(short value) {
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return (short) ( ( ( ( value >> 0 ) & 0xff ) << 8 ) +
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( ( ( value >> 8 ) & 0xff ) << 0 ) );
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}
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/**
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* Converts a "int" value between endian systems.
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* @param value value to convert
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* @return the converted value
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*/
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public static int swapInteger(int value) {
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return
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( ( ( value >> 0 ) & 0xff ) << 24 ) +
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( ( ( value >> 8 ) & 0xff ) << 16 ) +
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( ( ( value >> 16 ) & 0xff ) << 8 ) +
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( ( ( value >> 24 ) & 0xff ) << 0 );
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}
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/**
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* Converts a "long" value between endian systems.
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* @param value value to convert
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* @return the converted value
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*/
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public static long swapLong(long value) {
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return
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( ( ( value >> 0 ) & 0xff ) << 56 ) +
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( ( ( value >> 8 ) & 0xff ) << 48 ) +
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( ( ( value >> 16 ) & 0xff ) << 40 ) +
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( ( ( value >> 24 ) & 0xff ) << 32 ) +
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( ( ( value >> 32 ) & 0xff ) << 24 ) +
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( ( ( value >> 40 ) & 0xff ) << 16 ) +
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( ( ( value >> 48 ) & 0xff ) << 8 ) +
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( ( ( value >> 56 ) & 0xff ) << 0 );
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}
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/**
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* Converts a "float" value between endian systems.
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* @param value value to convert
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* @return the converted value
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*/
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public static float swapFloat(float value) {
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return Float.intBitsToFloat( swapInteger( Float.floatToIntBits( value ) ) );
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}
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/**
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* Converts a "double" value between endian systems.
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* @param value value to convert
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* @return the converted value
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*/
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public static double swapDouble(double value) {
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return Double.longBitsToDouble( swapLong( Double.doubleToLongBits( value ) ) );
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}
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// ========================================== Swapping read/write routines
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/**
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* Writes a "short" value to a byte array at a given offset. The value is
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* converted to the opposed endian system while writing.
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* @param data target byte array
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* @param offset starting offset in the byte array
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* @param value value to write
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*/
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public static void writeSwappedShort(byte[] data, int offset, short value) {
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data[ offset + 0 ] = (byte)( ( value >> 0 ) & 0xff );
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data[ offset + 1 ] = (byte)( ( value >> 8 ) & 0xff );
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}
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/**
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* Reads a "short" value from a byte array at a given offset. The value is
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* converted to the opposed endian system while reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static short readSwappedShort(byte[] data, int offset) {
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return (short)( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
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( ( data[ offset + 1 ] & 0xff ) << 8 ) );
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}
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/**
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* Reads an unsigned short (16-bit) value from a byte array at a given
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* offset. The value is converted to the opposed endian system while
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* reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static int readSwappedUnsignedShort(byte[] data, int offset) {
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return ( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
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( ( data[ offset + 1 ] & 0xff ) << 8 ) );
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}
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/**
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* Writes a "int" value to a byte array at a given offset. The value is
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* converted to the opposed endian system while writing.
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* @param data target byte array
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* @param offset starting offset in the byte array
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* @param value value to write
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*/
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public static void writeSwappedInteger(byte[] data, int offset, int value) {
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data[ offset + 0 ] = (byte)( ( value >> 0 ) & 0xff );
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data[ offset + 1 ] = (byte)( ( value >> 8 ) & 0xff );
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data[ offset + 2 ] = (byte)( ( value >> 16 ) & 0xff );
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data[ offset + 3 ] = (byte)( ( value >> 24 ) & 0xff );
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}
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/**
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* Reads a "int" value from a byte array at a given offset. The value is
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* converted to the opposed endian system while reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static int readSwappedInteger(byte[] data, int offset) {
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return ( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
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( ( data[ offset + 1 ] & 0xff ) << 8 ) +
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( ( data[ offset + 2 ] & 0xff ) << 16 ) +
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( ( data[ offset + 3 ] & 0xff ) << 24 ) );
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}
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/**
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* Reads an unsigned integer (32-bit) value from a byte array at a given
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* offset. The value is converted to the opposed endian system while
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* reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static long readSwappedUnsignedInteger(byte[] data, int offset) {
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long low = ( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
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( ( data[ offset + 1 ] & 0xff ) << 8 ) +
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( ( data[ offset + 2 ] & 0xff ) << 16 ) );
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long high = data[ offset + 3 ] & 0xff;
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return (high << 24) + (0xffffffffL & low);
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}
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/**
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* Writes a "long" value to a byte array at a given offset. The value is
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* converted to the opposed endian system while writing.
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* @param data target byte array
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* @param offset starting offset in the byte array
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* @param value value to write
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*/
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public static void writeSwappedLong(byte[] data, int offset, long value) {
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data[ offset + 0 ] = (byte)( ( value >> 0 ) & 0xff );
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data[ offset + 1 ] = (byte)( ( value >> 8 ) & 0xff );
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data[ offset + 2 ] = (byte)( ( value >> 16 ) & 0xff );
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data[ offset + 3 ] = (byte)( ( value >> 24 ) & 0xff );
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data[ offset + 4 ] = (byte)( ( value >> 32 ) & 0xff );
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data[ offset + 5 ] = (byte)( ( value >> 40 ) & 0xff );
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data[ offset + 6 ] = (byte)( ( value >> 48 ) & 0xff );
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data[ offset + 7 ] = (byte)( ( value >> 56 ) & 0xff );
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}
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/**
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* Reads a "long" value from a byte array at a given offset. The value is
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* converted to the opposed endian system while reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static long readSwappedLong(byte[] data, int offset) {
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long low =
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( ( data[ offset + 0 ] & 0xff ) << 0 ) +
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( ( data[ offset + 1 ] & 0xff ) << 8 ) +
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( ( data[ offset + 2 ] & 0xff ) << 16 ) +
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( ( data[ offset + 3 ] & 0xff ) << 24 );
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long high =
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( ( data[ offset + 4 ] & 0xff ) << 0 ) +
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( ( data[ offset + 5 ] & 0xff ) << 8 ) +
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( ( data[ offset + 6 ] & 0xff ) << 16 ) +
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( ( data[ offset + 7 ] & 0xff ) << 24 );
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return (high << 32) + (0xffffffffL & low);
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}
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/**
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* Writes a "float" value to a byte array at a given offset. The value is
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* converted to the opposed endian system while writing.
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* @param data target byte array
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* @param offset starting offset in the byte array
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* @param value value to write
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*/
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public static void writeSwappedFloat(byte[] data, int offset, float value) {
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writeSwappedInteger( data, offset, Float.floatToIntBits( value ) );
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}
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/**
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* Reads a "float" value from a byte array at a given offset. The value is
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* converted to the opposed endian system while reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static float readSwappedFloat(byte[] data, int offset) {
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return Float.intBitsToFloat( readSwappedInteger( data, offset ) );
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}
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/**
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* Writes a "double" value to a byte array at a given offset. The value is
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* converted to the opposed endian system while writing.
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* @param data target byte array
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* @param offset starting offset in the byte array
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* @param value value to write
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*/
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public static void writeSwappedDouble(byte[] data, int offset, double value) {
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writeSwappedLong( data, offset, Double.doubleToLongBits( value ) );
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}
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/**
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* Reads a "double" value from a byte array at a given offset. The value is
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* converted to the opposed endian system while reading.
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* @param data source byte array
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* @param offset starting offset in the byte array
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* @return the value read
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*/
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public static double readSwappedDouble(byte[] data, int offset) {
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return Double.longBitsToDouble( readSwappedLong( data, offset ) );
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}
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/**
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* Writes a "short" value to an OutputStream. The value is
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* converted to the opposed endian system while writing.
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* @param output target OutputStream
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* @param value value to write
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* @throws IOException in case of an I/O problem
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*/
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public static void writeSwappedShort(OutputStream output, short value)
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throws IOException
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{
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output.write( (byte)( ( value >> 0 ) & 0xff ) );
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output.write( (byte)( ( value >> 8 ) & 0xff ) );
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}
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/**
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* Reads a "short" value from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static short readSwappedShort(InputStream input)
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throws IOException
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{
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return (short)( ( ( read( input ) & 0xff ) << 0 ) +
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( ( read( input ) & 0xff ) << 8 ) );
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}
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/**
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* Reads a unsigned short (16-bit) from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static int readSwappedUnsignedShort(InputStream input)
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throws IOException
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{
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int value1 = read( input );
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int value2 = read( input );
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return ( ( ( value1 & 0xff ) << 0 ) +
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( ( value2 & 0xff ) << 8 ) );
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}
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/**
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* Writes a "int" value to an OutputStream. The value is
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* converted to the opposed endian system while writing.
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* @param output target OutputStream
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* @param value value to write
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* @throws IOException in case of an I/O problem
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*/
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public static void writeSwappedInteger(OutputStream output, int value)
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throws IOException
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{
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output.write( (byte)( ( value >> 0 ) & 0xff ) );
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output.write( (byte)( ( value >> 8 ) & 0xff ) );
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output.write( (byte)( ( value >> 16 ) & 0xff ) );
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output.write( (byte)( ( value >> 24 ) & 0xff ) );
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}
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/**
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* Reads a "int" value from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static int readSwappedInteger(InputStream input)
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throws IOException
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{
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int value1 = read( input );
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int value2 = read( input );
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int value3 = read( input );
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int value4 = read( input );
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return ( ( value1 & 0xff ) << 0 ) +
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( ( value2 & 0xff ) << 8 ) +
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( ( value3 & 0xff ) << 16 ) +
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( ( value4 & 0xff ) << 24 );
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}
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/**
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* Reads a unsigned integer (32-bit) from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static long readSwappedUnsignedInteger(InputStream input)
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throws IOException
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{
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int value1 = read( input );
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int value2 = read( input );
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int value3 = read( input );
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int value4 = read( input );
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long low = ( ( ( value1 & 0xff ) << 0 ) +
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( ( value2 & 0xff ) << 8 ) +
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( ( value3 & 0xff ) << 16 ) );
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long high = value4 & 0xff;
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return (high << 24) + (0xffffffffL & low);
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}
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/**
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* Writes a "long" value to an OutputStream. The value is
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* converted to the opposed endian system while writing.
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* @param output target OutputStream
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* @param value value to write
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* @throws IOException in case of an I/O problem
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*/
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public static void writeSwappedLong(OutputStream output, long value)
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throws IOException
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{
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output.write( (byte)( ( value >> 0 ) & 0xff ) );
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output.write( (byte)( ( value >> 8 ) & 0xff ) );
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output.write( (byte)( ( value >> 16 ) & 0xff ) );
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output.write( (byte)( ( value >> 24 ) & 0xff ) );
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output.write( (byte)( ( value >> 32 ) & 0xff ) );
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output.write( (byte)( ( value >> 40 ) & 0xff ) );
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output.write( (byte)( ( value >> 48 ) & 0xff ) );
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output.write( (byte)( ( value >> 56 ) & 0xff ) );
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}
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/**
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* Reads a "long" value from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static long readSwappedLong(InputStream input)
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throws IOException
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{
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byte[] bytes = new byte[8];
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for ( int i=0; i<8; i++ ) {
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bytes[i] = (byte) read( input );
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}
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return readSwappedLong( bytes, 0 );
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}
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/**
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* Writes a "float" value to an OutputStream. The value is
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* converted to the opposed endian system while writing.
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* @param output target OutputStream
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* @param value value to write
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* @throws IOException in case of an I/O problem
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*/
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public static void writeSwappedFloat(OutputStream output, float value)
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throws IOException
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{
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writeSwappedInteger( output, Float.floatToIntBits( value ) );
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}
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/**
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* Reads a "float" value from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static float readSwappedFloat(InputStream input)
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throws IOException
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{
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return Float.intBitsToFloat( readSwappedInteger( input ) );
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}
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/**
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* Writes a "double" value to an OutputStream. The value is
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* converted to the opposed endian system while writing.
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* @param output target OutputStream
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* @param value value to write
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* @throws IOException in case of an I/O problem
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*/
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public static void writeSwappedDouble(OutputStream output, double value)
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throws IOException
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{
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writeSwappedLong( output, Double.doubleToLongBits( value ) );
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}
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/**
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* Reads a "double" value from an InputStream. The value is
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* converted to the opposed endian system while reading.
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* @param input source InputStream
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* @return the value just read
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* @throws IOException in case of an I/O problem
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*/
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public static double readSwappedDouble(InputStream input)
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throws IOException
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{
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return Double.longBitsToDouble( readSwappedLong( input ) );
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}
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/**
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* Reads the next byte from the input stream.
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* @param input the stream
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* @return the byte
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* @throws IOException if the end of file is reached
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*/
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private static int read(InputStream input)
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throws IOException
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{
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int value = input.read();
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if( -1 == value ) {
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throw new EOFException( "Unexpected EOF reached" );
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}
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return value;
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}
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}
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