1 /* Copyright (c) 2001-2014, The HSQL Development Group 2 * All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of the HSQL Development Group nor the names of its 15 * contributors may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, 22 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32 package org.hsqldb.lib; 33 34 import java.io.IOException; 35 import java.io.InputStream; 36 import java.io.Reader; 37 38 /** 39 * This class is an part implementation of DataInput. It wraps a Reader object. 40 * 41 * @author Fred Toussi (fredt@users dot sourceforge.net) 42 * @version 1.9.0 43 * @since 1.9.0 44 */ 45 public class ReaderInputStream extends InputStream { 46 47 protected Reader reader; 48 protected long pos; 49 int lastChar = -1; 50 ReaderInputStream(Reader reader)51 public ReaderInputStream(Reader reader) { 52 this.reader = reader; 53 this.pos = 0; 54 } 55 read()56 public int read() throws IOException { 57 58 if (lastChar >= 0) { 59 int val = lastChar & 0xff; 60 61 lastChar = -1; 62 63 pos++; 64 return val; 65 } 66 67 lastChar = reader.read(); 68 69 if (lastChar < 0) { 70 return lastChar; 71 } 72 73 pos++; 74 return lastChar >> 8; 75 } 76 } 77