/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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*/
/* @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);
}
}