root / branches / Mobile_Compatible_Hito_1 / libFMap / src / es / prodevelop / gvsig / mobile / fmap / util / bytebuffer / FalseByteBuffer.java @ 21606
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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) 2006 Prodevelop 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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* http://www.gvsig.gva.es
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*
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* or
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*
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* Prodevelop Integraci?n de Tecnolog?as SL
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* Conde Salvatierra de ?lava , 34-10
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* 46004 Valencia
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* Spain
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*
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* +34 963 510 612
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* +34 963 510 968
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* gis@prodevelop.es
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* http://www.prodevelop.es
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*
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* or
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*
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* Instituto de Rob?tica
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* Apartado de correos 2085
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* 46071 Valencia
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* (Spain)
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*
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* +34 963 543 577
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* jjordan@robotica.uv.es
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* http://robotica.uv.es
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*
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*/
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package es.prodevelop.gvsig.mobile.fmap.util.bytebuffer; |
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import java.nio.ByteOrder; |
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/**
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* This class replaces the byte buffer used in J2SE to store a file in memory.
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*
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* @see java.nio.ByteOrder
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*
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* @author jldominguez
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*
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*/
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public class FalseByteBuffer { |
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private byte[] bytes; |
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private ByteOrder byteOrder = ByteOrder.LITTLE_ENDIAN; |
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private int pos = 0; |
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/**
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* Constructor
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* @param bb array of bytes to be stored
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*/
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public FalseByteBuffer(byte[] bb) { |
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bytes = bb; |
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} |
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/**
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* Moves file cursor to position p
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* @param p the new position
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*/
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public void position(int p) { |
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pos = p; |
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} |
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/**
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*
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* @return current cursor position
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*/
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public int getPosition() { |
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return pos;
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} |
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/**
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* @return byte pointed by cursor then increases cursor
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*/
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public byte getByte() { |
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byte resp = bytes[pos];
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pos++; |
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return resp;
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} |
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/**
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* Gets one byte
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* @param ind index of the byte of interest
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* @return the byte of interest
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*/
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public byte getByte(int ind) { |
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return bytes[ind];
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} |
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/**
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* @return integer pointed by cursor then increases cursor
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*/
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public int getInt() { |
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int resp = getInt(bytes, pos);
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pos = pos + 4;
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return resp;
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} |
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/**
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* @return short pointed by cursor then increases cursor
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*/
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public short getShort() { |
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short resp = getShort(bytes, pos);
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pos = pos + 2;
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return resp;
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} |
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/**
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* Gets the integer at a certain position
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* @param index the index of interest
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* @return the integer at a certain position
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*/
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public int getInt(int index) { |
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int resp = getInt(bytes, index);
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return resp;
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} |
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/**
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* Gets some bytes.
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* @param out the array of bytes to be filled
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*/
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public void getBytes(byte[] out) { |
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for (int i=0; i<out.length; i++) { |
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out[i] = getByte(pos + i); |
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} |
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pos = pos + out.length; |
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} |
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/**
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* @return double pointed by cursor then increases cursor
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*/
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public double getDouble() { |
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double resp = getDouble(bytes, pos);
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pos = pos + 8;
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return resp;
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} |
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private int getInt(final byte[] data, final int offset) { |
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return (int) getNumber(data, offset, 4); |
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} |
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private short getShort(final byte[] data, final int offset) { |
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return (short) getNumber(data, offset, 2); |
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} |
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private long getNumber(final byte[] data, final int offset, final int size) { |
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long result = 0; |
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if (byteOrder == ByteOrder.LITTLE_ENDIAN) { |
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for (int j = offset + size - 1; j >= offset; j--) { |
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result <<= 8;
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result |= 0xff & data[j];
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} |
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} else {
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for (int j = offset; j <= offset + size - 1; j++) { |
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result <<= 8;
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result |= 0xff & data[j];
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} |
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} |
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return result;
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} |
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private double getDouble(final byte[] data, final int offset) { |
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return Double.longBitsToDouble(getNumber(data, offset, 8)); |
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} |
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/**
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* Sets byte order (big endian, little endian)
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* @param o byte order (big endian, little endian)
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*/
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public void setByteOrder(ByteOrder o) { |
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byteOrder = o; |
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} |
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} |