96 lines
2.8 KiB
Java
96 lines
2.8 KiB
Java
/*
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* Copyright (c) 1998, 2006, 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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@bug 4090383
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@summary Ensure that BufferedInputStream's read method will fill the target
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array whenever possible
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*/
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.BufferedInputStream;
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public class Fill {
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/**
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* A simple InputStream that is always ready but may read fewer than the
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* requested number of bytes
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*/
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static class Source extends InputStream {
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int shortFall;
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byte next = 0;
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Source(int shortFall) {
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this.shortFall = shortFall;
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}
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public int read() throws IOException {
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return next++;
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}
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public int read(byte[] buf, int off, int len) throws IOException {
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int n = len - shortFall;
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for (int i = off; i < n; i++)
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buf[i] = next++;
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return n;
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}
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public int available() {
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return Integer.MAX_VALUE;
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}
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public void close() throws IOException {
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}
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}
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/**
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* Test BufferedInputStream with an underlying source that always reads
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* shortFall fewer bytes than requested
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*/
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static void go(int shortFall) throws Exception {
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InputStream r = new BufferedInputStream(new Source(shortFall), 10);
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byte[] buf = new byte[8];
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int n1 = r.read(buf);
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int n2 = r.read(buf);
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System.err.println("Shortfall " + shortFall
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+ ": Read " + n1 + ", then " + n2 + " bytes");
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if (n1 != buf.length)
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throw new Exception("First read returned " + n1);
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if (n2 != buf.length)
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throw new Exception("Second read returned " + n2);
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}
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public static void main(String[] args) throws Exception {
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for (int i = 0; i < 8; i++) go(i);
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}
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}
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