root / org.gvsig.dgn / trunk / org.gvsig.dgn / org.gvsig.dgn.provider / src / main / java / org / gvsig / fmap / dal / store / dgn / lib / ByteUtils.java @ 6
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/*
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* Created on 21-jul-2003
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*
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* Copyright (c) 2003
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* Francisco Jos? Pe?arrubia Mart?nez
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* IVER Tecnolog?as de la Informaci?n S.A.
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* Salamanca 50
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* 46005 Valencia ( SPAIN )
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* +34 963163400
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* mailto:fran@iver.es
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* http://www.iver.es
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*/
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package org.gvsig.fmap.dal.store.dgn.lib; |
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import java.math.BigInteger; |
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/**
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* Clase que engloba m?todos para trabajar con bytes.
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*
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* @author Vicente Caballero Navarro
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*/
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public class ByteUtils { |
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public static final int SIZE_BOOL = 1; |
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public static final int SIZE_SHORT = 2; |
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public static final int SIZE_INT = 4; |
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public static final int SIZE_LONG = 8; |
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public static final int SIZE_DOUBLE = 8; |
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/** A nibble->char mapping for printing out bytes. */
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public static final char[] digits = { |
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', |
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'e', 'f' |
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}; |
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|
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/**
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* Return the <code>int</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
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* data from which to begin reading on function entry, and which on
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* function exit has been incremented by the number of bytes read.
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*
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* @return the value of the <code>int</code> decoded
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*/
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public static final int bytesToInt(byte[] data, int[] offset) { |
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/**
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* TODO: We use network-order within OceanStore, but temporarily
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* supporting intel-order to work with some JNI code until JNI code is
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* set to interoperate with network-order.
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*/
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int result = 0; |
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for (int i = 0; i < SIZE_INT; ++i) { |
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result <<= 8;
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result |= byteToUnsignedInt(data[offset[0]++]);
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} |
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return result;
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} |
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/**
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* Write the bytes representing <code>i</code> into the byte array
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* <code>data</code>, starting at index <code>offset [0]</code>, and
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* increment <code>offset [0]</code> by the number of bytes written; if
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* <code>data == null</code>, increment <code>offset [0]</code> by the
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* number of bytes that would have been written otherwise.
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*
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* @param i the <code>int</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
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* @param offset A single element array whose first element is the index in
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void intToBytes(int i, byte[] data, int[] offset) { |
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/**
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* TODO: We use network-order within OceanStore, but temporarily
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* supporting intel-order to work with some JNI code until JNI code is
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* set to interoperate with network-order.
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*/
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if (data != null) { |
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for (int j = (offset[0] + SIZE_INT) - 1; j >= offset[0]; --j) { |
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data[j] = (byte) i;
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i >>= 8;
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} |
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} |
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offset[0] += SIZE_INT;
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} |
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/**
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* Return the <code>short</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
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* data from which to begin reading on function entry, and which on
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* function exit has been incremented by the number of bytes read.
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*
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* @return the value of the <code>short</code> decoded
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*/
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public static final short bytesToShort(byte[] data, int[] offset) { |
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/**
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* TODO: We use network-order within OceanStore, but temporarily
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* supporting intel-order to work with some JNI code until JNI code is
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* set to interoperate with network-order.
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*/
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short result = 0; |
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for (int i = 0; i < SIZE_SHORT; ++i) { |
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result <<= 8;
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result |= (short) byteToUnsignedInt(data[offset[0]++]); |
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} |
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return result;
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} |
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/**
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* Write the bytes representing <code>s</code> into the byte array
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* <code>data</code>, starting at index <code>offset [0]</code>, and
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* increment <code>offset [0]</code> by the number of bytes written; if
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* <code>data == null</code>, increment <code>offset [0]</code> by the
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* number of bytes that would have been written otherwise.
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*
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* @param s the <code>short</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
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* @param offset A single element array whose first element is the index in
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void shortToBytes(short s, byte[] data, int[] offset) { |
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/**
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* TODO: We use network-order within OceanStore, but temporarily
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* supporting intel-order to work with some JNI code until JNI code is
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* set to interoperate with network-order.
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*/
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if (data != null) { |
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data[offset[0] + 1] = (byte) s; |
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data[offset[0]] = (byte) (s >> 8); |
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} |
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offset[0] += SIZE_SHORT;
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} |
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/**
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* Return the <code>long</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
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* data from which to begin reading on function entry, and which
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* on function exit has been incremented by the number of bytes
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* read.
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*
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* @return the value of the <code>long</code> decoded
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*/
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public static final long bytesToLong(byte[] data, int[] offset) { |
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long result = 0; |
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for (int i = 0; i < SIZE_LONG; ++i) { |
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result <<= 8;
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int res = byteToUnsignedInt(data[offset[0]++]); |
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result = result | res; |
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} |
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return result;
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} |
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/**
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* Write the bytes representing <code>l</code> into the byte array
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* <code>data</code>, starting at index <code>offset [0]</code>, and
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* increment <code>offset [0]</code> by the number of bytes written; if
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* <code>data == null</code>, increment <code>offset [0]</code> by the
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* number of bytes that would have been written otherwise.
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*
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* @param l the <code>long</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
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* @param offset A single element array whose first element is the index in
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void longToBytes(long l, byte[] data, int[] offset) { |
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/**
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* TODO: We use network-order within OceanStore, but temporarily
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* supporting intel-order to work with some JNI code until JNI code is
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* set to interoperate with network-order.
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*/
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if (data != null) { |
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for (int j = (offset[0] + SIZE_LONG) - 1; j >= offset[0]; --j) { |
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data[j] = (byte) l;
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l >>= 8;
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} |
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} |
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offset[0] += SIZE_LONG;
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} |
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/**
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* Return the <code>double</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
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* data from which to begin reading on function entry, and which
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* on function exit has been incremented by the number of bytes
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* read.
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*
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* @return the value of the <code>double</code> decoded
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*/
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public static final double bytesToDouble(byte[] data, int[] offset) { |
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long bits = bytesToLong(data, offset);
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return Double.longBitsToDouble(bits); |
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} |
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/**
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* Write the bytes representing <code>d</code> into the byte array
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* <code>data</code>, starting at index <code>offset [0]</code>, and
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* increment <code>offset [0]</code> by the number of bytes written; if
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* <code>data == null</code>, increment <code>offset [0]</code> by the
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* number of bytes that would have been written otherwise.
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*
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* @param d the <code>double</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
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* @param offset A single element array whose first element is the index in
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void doubleToBytes(double d, byte[] data, int[] offset) { |
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long bits = Double.doubleToLongBits(d); |
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longToBytes(bits, data, offset); |
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} |
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/**
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* Return the <code>String</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>. This method
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* relies on the user using the corresponding <code>stringToBytes</code>
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* method to encode the <code>String</code>, so that it may properly
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* retrieve the <code>String</code> length.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
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* data from which to begin reading on function entry, and which on
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* function exit has been incremented by the number of bytes read.
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*
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* @return the value of the <code>String</code> decoded
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*/
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public static final String bytesToString(byte[] data, int[] offset) { |
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offset[0] = 0; |
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int length = bytesToInt(data, offset);
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String st = null; |
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if ((length < 0) || (length > data.length)) { |
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st = new String(data); |
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} else {
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st = new String(data, offset[0], length); |
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} |
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offset[0] += length;
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return st;
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} |
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/**
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* Write the bytes representing <code>s</code> into the byte array
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* <code>data</code>, starting at index <code>offset [0]</code>, and
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* increment <code>offset [0]</code> by the number of bytes written; if
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* <code>data == null</code>, increment <code>offset [0]</code> by the
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* number of bytes that would have been written otherwise.
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*
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* @param s the <code>String</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
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* @param offset A single element array whose first element is the index in
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void stringToBytes(String s, byte[] data, int[] offset) { |
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byte[] s_bytes = s.getBytes(); |
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if (data != null) { |
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intToBytes(s_bytes.length, data, offset); |
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memcpy(data, offset[0], s_bytes, 0, s_bytes.length); |
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} else {
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offset[0] += SIZE_INT;
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} |
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offset[0] += s_bytes.length;
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} |
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/**
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* Return the <code>boolean</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
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* @param offset A single element array whose first element is the index in
|
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* data from which to begin reading on function entry, and which
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* on function exit has been incremented by the number of bytes
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* read.
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*
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* @return the value of the <code>boolean</code> decoded
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*/
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public static final boolean bytesToBool(byte[] data, int[] offset) { |
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boolean result = true; |
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if (data[offset[0]] == 0) { |
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result = false;
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} |
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offset[0] += SIZE_BOOL;
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return result;
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} |
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|
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/**
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* Write the bytes representing <code>b</code> into the byte array
|
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* <code>data</code>, starting at index <code>offset [0]</code>, and
|
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* increment <code>offset [0]</code> by the number of bytes written; if
|
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* <code>data == null</code>, increment <code>offset [0]</code> by the
|
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* number of bytes that would have been written otherwise.
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*
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* @param b the <code>boolean</code> to encode
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* @param data The byte array to store into, or <code>null</code>.
|
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* @param offset A single element array whose first element is the index in
|
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* data to begin writing at on function entry, and which on
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* function exit has been incremented by the number of bytes
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* written.
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*/
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public static final void boolToBytes(boolean b, byte[] data, int[] offset) { |
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if (data != null) { |
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data[offset[0]] = (byte) (b ? 1 : 0); |
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} |
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offset[0] += SIZE_BOOL;
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} |
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/**
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* Return the <code>BigInteger</code> represented by the bytes in
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* <code>data</code> staring at offset <code>offset[0]</code>.
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*
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* @param data the array from which to read
|
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* @param offset A single element array whose first element is the index in
|
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* data from which to begin reading on function entry, and which
|
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* on function exit has been incremented by the number of bytes
|
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* read.
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*
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* @return the <code>BigInteger</code> decoded
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*/
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public static final BigInteger bytesToBigInteger(byte[] data, int[] offset) { |
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int length = bytesToInt(data, offset);
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byte[] bytes = new byte[length]; |
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offset[0] += memcpy(bytes, 0, data, offset[0], length); |
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return new BigInteger(bytes); |
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} |
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|
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/**
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* Write the bytes representing <code>n</code> into the byte array
|
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* <code>data</code>, starting at index <code>offset [0]</code>, and
|
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* increment <code>offset [0]</code> by the number of bytes written; if
|
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* <code>data == null</code>, increment <code>offset [0]</code> by the
|
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* number of bytes that would have been written otherwise.
|
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*
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* @param n the <code>BigInteger</code> to encode
|
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* @param data The byte array to store into, or <code>null</code>.
|
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* @param offset A single element array whose first element is the index in
|
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* data to begin writing at on function entry, and which on
|
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* function exit has been incremented by the number of bytes
|
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* written.
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*/
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public static final void bigIntegerToBytes(BigInteger n, byte[] data, |
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int[] offset) { |
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byte[] bytes = n.toByteArray(); |
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intToBytes(bytes.length, data, offset); |
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offset[0] += memcpy(data, offset[0], bytes, 0, bytes.length); |
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} |
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|
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/**
|
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* Convert an array of <code>bytes</code>s into an array of
|
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* <code>ints</code>.
|
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*
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* @param dst the array to write
|
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* @param dst_offset the start offset in <code>dst</code>, times 4. This
|
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* measures the offset as if <code>dst</code> were an array of
|
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* <code>byte</code>s (rather than <code>int</code>s).
|
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* @param src the array to read
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* @param src_offset the start offset in <code>src</code>
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* @param length the number of <code>byte</code>s to copy.
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*/
|
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public static final void bytesToInts(int[] dst, int dst_offset, byte[] src, |
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int src_offset, int length) { |
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if ((src == null) || (dst == null) || |
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((src_offset + length) > src.length) || |
| 441 |
((dst_offset + length) > (dst.length * 4)) ||
|
| 442 |
((dst_offset % 4) != 0) || ((length % 4) != 0)) { |
| 443 |
croak("bytesToInts parameters are invalid" + " src==" + src + |
| 444 |
" dst==" + dst +
|
| 445 |
(((src == null) || (dst == null)) ? " " |
| 446 |
: (" (src_offset+length)>src.length==" +
|
| 447 |
(src_offset + length) + ">" + src.length +
|
| 448 |
" (dst_offset+length)>(dst.length*4)==" +
|
| 449 |
(dst_offset + length) + ">" + (dst.length * 4) + |
| 450 |
" (dst_offset%4)==" + (dst_offset % 4) + " (length%4)==" + |
| 451 |
(length % 4) + " dest.length==" + dst.length + " length==" + |
| 452 |
length))); |
| 453 |
} |
| 454 |
|
| 455 |
// Convert parameters to normal format
|
| 456 |
int[] offset = new int[1]; |
| 457 |
offset[0] = src_offset;
|
| 458 |
|
| 459 |
int int_dst_offset = dst_offset / 4; |
| 460 |
|
| 461 |
for (int i = 0; i < (length / 4); ++i) { |
| 462 |
dst[int_dst_offset++] = bytesToInt(src, offset); |
| 463 |
} |
| 464 |
} |
| 465 |
|
| 466 |
/**
|
| 467 |
* Convert an array of <code>int</code>s into an array of
|
| 468 |
* <code>bytes</code>.
|
| 469 |
*
|
| 470 |
* @param dst the array to write
|
| 471 |
* @param dst_offset the start offset in <code>dst</code>
|
| 472 |
* @param src the array to read
|
| 473 |
* @param src_offset the start offset in <code>src</code>, times 4. This
|
| 474 |
* measures the offset as if <code>src</code> were an array of
|
| 475 |
* <code>byte</code>s (rather than <code>int</code>s).
|
| 476 |
* @param length the number of <code>byte</code>s to copy.
|
| 477 |
*/
|
| 478 |
public static final void intsToBytes(byte[] dst, int dst_offset, int[] src, |
| 479 |
int src_offset, int length) { |
| 480 |
if ((src == null) || (dst == null) || |
| 481 |
((dst_offset + length) > dst.length) || |
| 482 |
((src_offset + length) > (src.length * 4)) ||
|
| 483 |
((src_offset % 4) != 0) || ((length % 4) != 0)) { |
| 484 |
croak("intsToBytes parameters are invalid:" + " src=" + src + |
| 485 |
" dst=" + dst + " (dst_offset=" + dst_offset + " + length=" + |
| 486 |
length + ")=" + (dst_offset + length) + " > dst.length=" + |
| 487 |
((dst == null) ? 0 : dst.length) + " (src_offset=" + |
| 488 |
src_offset + " + length=" + length + ")=" + |
| 489 |
(src_offset + length) + " > (src.length=" +
|
| 490 |
((src == null) ? 0 : src.length) + "*4)=" + |
| 491 |
((src == null) ? 0 : (src.length * 4)) + " (src_offset=" + |
| 492 |
src_offset + " % 4)=" + (src_offset % 4) + " != 0" + |
| 493 |
" (length=" + length + " % 4)=" + (length % 4) + " != 0"); |
| 494 |
} |
| 495 |
|
| 496 |
// Convert parameters to normal format
|
| 497 |
int[] offset = new int[1]; |
| 498 |
offset[0] = dst_offset;
|
| 499 |
|
| 500 |
int int_src_offset = src_offset / 4; |
| 501 |
|
| 502 |
for (int i = 0; i < (length / 4); ++i) { |
| 503 |
intToBytes(src[int_src_offset++], dst, offset); |
| 504 |
} |
| 505 |
} |
| 506 |
|
| 507 |
/**
|
| 508 |
* Convert a <code>byte</code> into an unsigned integer.
|
| 509 |
*
|
| 510 |
* @param b the <code>byte</code> to cast
|
| 511 |
*
|
| 512 |
* @return a postiive <code>int</code> whose lowest byte contains the bits
|
| 513 |
* of <code>b</code>.
|
| 514 |
*/
|
| 515 |
public static final int byteToUnsignedInt(byte b) { |
| 516 |
return (b) & 0xff; |
| 517 |
} |
| 518 |
|
| 519 |
/**
|
| 520 |
* Copy contents of one array of <code>bytes</code> into another. If either
|
| 521 |
* array is <code>null</code>, simply return the <code>length</code>
|
| 522 |
* parameter directly.
|
| 523 |
*
|
| 524 |
* @param dst the array to write, or <code>null</code>
|
| 525 |
* @param dst_offset the start offset in <code>dst</code>
|
| 526 |
* @param src the array to read, or <code>null</code>
|
| 527 |
* @param src_offset the start offset in <code>src</code>
|
| 528 |
* @param length the number of <code>byte</code>s to copy.
|
| 529 |
*
|
| 530 |
* @return DOCUMENT ME!
|
| 531 |
*/
|
| 532 |
public static int memcpy(byte[] dst, int dst_offset, byte[] src, |
| 533 |
int src_offset, int length) { |
| 534 |
if ((dst != null) && (src != null)) { |
| 535 |
if (dst.length < (dst_offset + length)) {
|
| 536 |
croak("dst.length = " + dst.length + ", but " + |
| 537 |
"dst_offset = " + dst_offset + " and length = " + length + |
| 538 |
".");
|
| 539 |
} |
| 540 |
|
| 541 |
if (src.length < (src_offset + length)) {
|
| 542 |
croak("src.length = " + src.length + ", but " + |
| 543 |
"src_offset = " + src_offset + " and length = " + length + |
| 544 |
".");
|
| 545 |
} |
| 546 |
|
| 547 |
for (int i = 0; i < length; ++i, ++dst_offset, ++src_offset) { |
| 548 |
dst[dst_offset] = src[src_offset]; |
| 549 |
} |
| 550 |
} |
| 551 |
|
| 552 |
return length;
|
| 553 |
} |
| 554 |
|
| 555 |
/**
|
| 556 |
* Compare the contents of one array of <code>bytes</code> to another.
|
| 557 |
*
|
| 558 |
* @param a the first array
|
| 559 |
* @param a_offset the start offset in <code>a</code>
|
| 560 |
* @param b the second array
|
| 561 |
* @param b_offset the start offset in <code>b</code>
|
| 562 |
* @param length the number of <code>byte</code>s to compare.
|
| 563 |
*
|
| 564 |
* @return DOCUMENT ME!
|
| 565 |
*/
|
| 566 |
public static boolean memcmp(byte[] a, int a_offset, byte[] b, |
| 567 |
int b_offset, int length) { |
| 568 |
if ((a == null) && (b == null)) { |
| 569 |
return true; |
| 570 |
} |
| 571 |
|
| 572 |
if ((a == null) || (b == null)) { |
| 573 |
return false; |
| 574 |
} |
| 575 |
|
| 576 |
for (int i = 0; i < length; ++i, ++a_offset, ++b_offset) { |
| 577 |
if (a[a_offset] != b[b_offset]) {
|
| 578 |
return false; |
| 579 |
} |
| 580 |
} |
| 581 |
|
| 582 |
return true; |
| 583 |
} |
| 584 |
|
| 585 |
/**
|
| 586 |
* Fill the given array with zeros.
|
| 587 |
*
|
| 588 |
* @param array the array to clear
|
| 589 |
* @param offset the start offset
|
| 590 |
* @param length the number of <code>byte</code>s to clear.
|
| 591 |
*/
|
| 592 |
public static void memclr(byte[] array, int offset, int length) { |
| 593 |
for (int i = 0; i < length; ++i, ++offset) { |
| 594 |
array[offset] = 0;
|
| 595 |
} |
| 596 |
} |
| 597 |
|
| 598 |
/**
|
| 599 |
* Round a number up to a given multiple.
|
| 600 |
*
|
| 601 |
* @param value the number to be rounded
|
| 602 |
* @param multiple the number to which to be rounded
|
| 603 |
*
|
| 604 |
* @return the smallest <code>int</code> greater than or equal to
|
| 605 |
* <code>value</code> which divides <code>multiple</code> exactly.
|
| 606 |
*/
|
| 607 |
public static int round_up(int value, int multiple) { |
| 608 |
return (((value - 1) / multiple) + 1) * multiple; |
| 609 |
} |
| 610 |
|
| 611 |
/**
|
| 612 |
* Return a new array equal to original except zero-padded to an integral
|
| 613 |
* mulitple of blocks. If the original is already an integral multiple of
|
| 614 |
* blocks, just return it.
|
| 615 |
*
|
| 616 |
* @param original the array of <code>byte</code>s to be padded
|
| 617 |
* @param block_size the size of the blocks
|
| 618 |
*
|
| 619 |
* @return an array whose size divides <code>block_size</code> exactly. The
|
| 620 |
* array is either <code>original</code> itself, or a copy whose
|
| 621 |
* first <code>original.length</code> bytes are equal to
|
| 622 |
* <code>original</code>.
|
| 623 |
*/
|
| 624 |
public static byte[] zero_pad(byte[] original, int block_size) { |
| 625 |
if ((original.length % block_size) == 0) { |
| 626 |
return original;
|
| 627 |
} |
| 628 |
|
| 629 |
byte[] result = new byte[round_up(original.length, block_size)]; |
| 630 |
memcpy(result, 0, original, 0, original.length); |
| 631 |
|
| 632 |
// Unnecessary - jvm sets bytes to 0.
|
| 633 |
// memclr (result, original.length, result.length - original.length);
|
| 634 |
return result;
|
| 635 |
} |
| 636 |
|
| 637 |
/**
|
| 638 |
* Determines whether two arrays of <code>byte</code>s contain the same
|
| 639 |
* contents.
|
| 640 |
*
|
| 641 |
* @param b1 The first array
|
| 642 |
* @param b2 The second array
|
| 643 |
*
|
| 644 |
* @return <code>true</code> if both arrays are <code>null</code>, both
|
| 645 |
* empty, or both of the same length with equal contents.
|
| 646 |
*/
|
| 647 |
public static boolean equals(byte[] b1, byte[] b2) { |
| 648 |
if (b1 == b2) {
|
| 649 |
return true; |
| 650 |
} |
| 651 |
|
| 652 |
if ((b1 == null) || (b2 == null)) { // only one is null |
| 653 |
|
| 654 |
return false; |
| 655 |
} |
| 656 |
|
| 657 |
if (b1.length != b2.length) {
|
| 658 |
return false; |
| 659 |
} |
| 660 |
|
| 661 |
for (int i = 0; i < b1.length; ++i) { |
| 662 |
if (b1[i] != b2[i]) {
|
| 663 |
return false; |
| 664 |
} |
| 665 |
} |
| 666 |
|
| 667 |
return true; |
| 668 |
} |
| 669 |
|
| 670 |
/**
|
| 671 |
* Produce a <code>String</code> representation for the specified array of
|
| 672 |
* <code>byte</code>s. Print each <code>byte</code> as two hexadecimal
|
| 673 |
* digits.
|
| 674 |
*
|
| 675 |
* @param data The array to print
|
| 676 |
* @param offset the start offset in <code>data</code>
|
| 677 |
* @param length the number of <code>byte</code>s to print
|
| 678 |
*
|
| 679 |
* @return DOCUMENT ME!
|
| 680 |
*/
|
| 681 |
public static String print_bytes(byte[] data, int offset, int length) { |
| 682 |
int size = 2 * length; |
| 683 |
size += ((size / 8) + (size / 64)); |
| 684 |
|
| 685 |
char[] buf = new char[size]; |
| 686 |
int low_mask = 0x0f; |
| 687 |
int high_mask = 0xf0; |
| 688 |
int buf_pos = 0; |
| 689 |
byte b;
|
| 690 |
|
| 691 |
int j = 0; |
| 692 |
|
| 693 |
for (int i = offset; i < (offset + length); ++i) { |
| 694 |
b = data[i]; |
| 695 |
buf[buf_pos++] = digits[(high_mask & b) >> 4];
|
| 696 |
buf[buf_pos++] = digits[(low_mask & b)]; |
| 697 |
|
| 698 |
if ((j % 4) == 3) { |
| 699 |
buf[buf_pos++] = ' ';
|
| 700 |
} |
| 701 |
|
| 702 |
if ((j % 32) == 31) { |
| 703 |
buf[buf_pos++] = '\n';
|
| 704 |
} |
| 705 |
|
| 706 |
++j; |
| 707 |
} |
| 708 |
|
| 709 |
return new String(buf); |
| 710 |
} |
| 711 |
|
| 712 |
/**
|
| 713 |
* DOCUMENT ME!
|
| 714 |
*
|
| 715 |
* @param data DOCUMENT ME!
|
| 716 |
* @param offset DOCUMENT ME!
|
| 717 |
* @param length DOCUMENT ME!
|
| 718 |
*
|
| 719 |
* @return DOCUMENT ME!
|
| 720 |
*/
|
| 721 |
public static String print_bytes_exact(byte[] data, int offset, int length) { |
| 722 |
int size = 2 * length; |
| 723 |
char[] buf = new char[size]; |
| 724 |
int low_mask = 0x0f; |
| 725 |
int high_mask = 0xf0; |
| 726 |
int buf_pos = 0; |
| 727 |
byte b;
|
| 728 |
|
| 729 |
int j = 0; |
| 730 |
|
| 731 |
for (int i = offset; i < (offset + length); ++i) { |
| 732 |
b = data[i]; |
| 733 |
buf[buf_pos++] = digits[(high_mask & b) >> 4];
|
| 734 |
buf[buf_pos++] = digits[(low_mask & b)]; |
| 735 |
++j; |
| 736 |
} |
| 737 |
|
| 738 |
return new String(buf); |
| 739 |
} |
| 740 |
|
| 741 |
/**
|
| 742 |
* DOCUMENT ME!
|
| 743 |
*
|
| 744 |
* @param data DOCUMENT ME!
|
| 745 |
*
|
| 746 |
* @return DOCUMENT ME!
|
| 747 |
*/
|
| 748 |
public static String print_bytes(byte[] data) { |
| 749 |
return print_bytes(data, 0, data.length); |
| 750 |
} |
| 751 |
|
| 752 |
/**
|
| 753 |
* DOCUMENT ME!
|
| 754 |
*
|
| 755 |
* @param msg DOCUMENT ME!
|
| 756 |
*/
|
| 757 |
private static void croak(String msg) { |
| 758 |
// throw new java.AssertionViolatedException(msg);
|
| 759 |
} |
| 760 |
|
| 761 |
/**
|
| 762 |
* DOCUMENT ME!
|
| 763 |
*
|
| 764 |
* @param b DOCUMENT ME!
|
| 765 |
*
|
| 766 |
* @return DOCUMENT ME!
|
| 767 |
*/
|
| 768 |
public static int getUnsigned(byte b) { |
| 769 |
return ((b & 0xff)); // >> 8); |
| 770 |
} |
| 771 |
} |