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