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The source code/* * Copyright 2002,2004 The Apache Software Foundation. * * 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 org.apache.commons.io; import java.io.IOException; import java.io.OutputStream; /** * Dumps data in hexadecimal format. * * Derived from a HexDump utility I wrote in June 2001. * * Taken from the POI project. * * @author Scott Sanders (sanders at apache dot org) * @author Marc Johnson * @version $Revision: 1.8 $ $Date: 2004/02/23 04:35:59 $ */ public class HexDump { /** * Instances should NOT be constructed in standard programming. */ public HexDump() { } /** * dump an array of bytes to an OutputStream * * @param data the byte array to be dumped * @param offset its offset, whatever that might mean * @param stream the OutputStream to which the data is to be * written * @param index initial index into the byte array * * @exception IOException is thrown if anything goes wrong writing * the data to stream * @exception ArrayIndexOutOfBoundsException if the index is * outside the data array's bounds * @exception IllegalArgumentException if the output stream is * null */ public static void dump(byte[] data, long offset, OutputStream stream, int index) throws IOException, ArrayIndexOutOfBoundsException, IllegalArgumentException { if ((index < 0) || (index >= data.length)) { throw new ArrayIndexOutOfBoundsException( "illegal index: " + index + " into array of length " + data.length); } if (stream == null) { throw new IllegalArgumentException("cannot write to nullstream"); } long display_offset = offset + index; StringBuffer buffer = new StringBuffer(74); for (int j = index; j < data.length; j += 16) { int chars_read = data.length - j; if (chars_read > 16) { chars_read = 16; } buffer.append(dump(display_offset)).append(' '); for (int k = 0; k < 16; k++) { if (k < chars_read) { buffer.append(dump(data[k + j])); } else { buffer.append(" "); } buffer.append(' '); } for (int k = 0; k < chars_read; k++) { if ((data[k + j] >= ' ') && (data[k + j] < 127)) { buffer.append((char) data[k + j]); } else { buffer.append('.'); } } buffer.append(EOL); stream.write(buffer.toString().getBytes()); stream.flush(); buffer.setLength(0); display_offset += chars_read; } } /** line-separator (initializes to "line.separator" system property. */ public static final String EOL = System.getProperty("line.separator"); private static final StringBuffer _lbuffer = new StringBuffer(8); private static final StringBuffer _cbuffer = new StringBuffer(2); private static final char _hexcodes[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; private static final int _shifts[] = { 28, 24, 20, 16, 12, 8, 4, 0 }; private static StringBuffer dump(long value) { _lbuffer.setLength(0); for (int j = 0; j < 8; j++) { _lbuffer .append(_hexcodes[((int) (value >> _shifts[j])) & 15]); } return _lbuffer; } private static StringBuffer dump(byte value) { _cbuffer.setLength(0); for (int j = 0; j < 2; j++) { _cbuffer.append(_hexcodes[(value >> _shifts[j + 6]) & 15]); } return _cbuffer; } } |
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