| /* |
| * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @summary Ensure that InputStreamReader reads as many characters as possible |
| */ |
| |
| // InputStreamReader is not required by its spec to read as many characters as |
| // possible upon each invocation of read(char[], int, int), but many programs |
| // (e.g., javac) depend upon this behavior. |
| |
| import java.io.*; |
| |
| |
| public class FullRead { |
| |
| static int MAX_LEN = 1 << 16; |
| |
| static void test(File f, int len) throws Exception { |
| FileOutputStream fo = new FileOutputStream(f); |
| for (int i = 0; i < len; i++) |
| fo.write('x'); |
| fo.close(); |
| |
| FileInputStream fi = new FileInputStream(f); |
| Reader rd = new InputStreamReader(fi, "US-ASCII"); |
| char[] cb = new char[MAX_LEN + 100]; |
| int n = rd.read(cb, 0, cb.length); |
| System.out.println(len + " : " + n); |
| if (len != n) |
| throw new Exception("Expected " + len + ", read " + n); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| File f = File.createTempFile("foo", "bar"); |
| f.deleteOnExit(); |
| System.out.println(f); |
| |
| for (int i = 4; i <= MAX_LEN; i <<= 1) |
| test(f, i); |
| } |
| |
| } |