1/* 2 * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* @test 25 @bug 4090383 26 @summary Ensure that BufferedInputStream's read method will fill the target 27 array whenever possible 28 */ 29 30 31import java.io.IOException; 32import java.io.InputStream; 33import java.io.BufferedInputStream; 34 35 36public class Fill { 37 38 /** 39 * A simple InputStream that is always ready but may read fewer than the 40 * requested number of bytes 41 */ 42 static class Source extends InputStream { 43 44 int shortFall; 45 byte next = 0; 46 47 Source(int shortFall) { 48 this.shortFall = shortFall; 49 } 50 51 public int read() throws IOException { 52 return next++; 53 } 54 55 public int read(byte[] buf, int off, int len) throws IOException { 56 int n = len - shortFall; 57 for (int i = off; i < n; i++) 58 buf[i] = next++; 59 return n; 60 } 61 62 public int available() { 63 return Integer.MAX_VALUE; 64 } 65 66 public void close() throws IOException { 67 } 68 69 } 70 71 /** 72 * Test BufferedInputStream with an underlying source that always reads 73 * shortFall fewer bytes than requested 74 */ 75 static void go(int shortFall) throws Exception { 76 77 InputStream r = new BufferedInputStream(new Source(shortFall), 10); 78 byte[] buf = new byte[8]; 79 80 int n1 = r.read(buf); 81 int n2 = r.read(buf); 82 System.err.println("Shortfall " + shortFall 83 + ": Read " + n1 + ", then " + n2 + " bytes"); 84 if (n1 != buf.length) 85 throw new Exception("First read returned " + n1); 86 if (n2 != buf.length) 87 throw new Exception("Second read returned " + n2); 88 89 } 90 91 public static void main(String[] args) throws Exception { 92 for (int i = 0; i < 8; i++) go(i); 93 } 94 95} 96