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kaklik |
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/*
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AVRcamVIEW: A PC application to test out the functionallity of the
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AVRcam real-time image processing engine.
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Copyright (C) 2004 Brent A. Taylor
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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
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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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 GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License 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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For more information on the AVRcamVIEW, please contact:
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taylorba@comcast.net
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or go to www.jrobot.net for more details regarding the system.
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*/
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package avr.io;
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import java.io.*;
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public class AVRInputStream extends FilterInputStream {
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private static final int NEW_LINE = '\r';
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private static final int END_DUMP_DATA = 0x0F;
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private static final int END_TRACK_DATA = 0xFF;
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private static final int SEARCHING_STATE = 0x00;
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private static final int DUMP_FRAME_STATE = 0x01;
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private static final int ACCEPTING_STATE = 0x02;
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public AVRInputStream(InputStream in) {
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super(in);
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}
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public int read(byte[] data, int off, int len) throws IOException {
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int terminator = NEW_LINE;
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int state = SEARCHING_STATE;
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int value = -1;
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int bytesRead = 0;
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boolean cont = false;
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do {
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value = read();
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if(value != -1) {
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switch(state) {
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case SEARCHING_STATE:
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//System.out.println("(" + Integer.toHexString(value & 0xFF) + ") ");
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data[off] = (byte)value;
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if(value == 0x0A) {
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terminator = END_TRACK_DATA;
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state = ACCEPTING_STATE;
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bytesRead++;
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} else if(value == 0x0B) {
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terminator = END_DUMP_DATA;
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state = DUMP_FRAME_STATE;
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bytesRead++;
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} else if(value == 'A' || value == 'N') {
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terminator = NEW_LINE;
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state = ACCEPTING_STATE;
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bytesRead++;
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}
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cont = false;
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break;
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case DUMP_FRAME_STATE:
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data[off + bytesRead++] = (byte)value;
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state = ACCEPTING_STATE;
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cont = true;
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break;
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case ACCEPTING_STATE:
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//System.out.println(Integer.toHexString(value & 0xFF) + " ");
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data[off + bytesRead++] = (byte)value;
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cont = false;
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break;
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}
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}
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} while(cont || value != terminator);
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return bytesRead;
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}
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}
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