1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7 * published by the Free Software Foundation.
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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).
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22 */
23
24/* @test
25 * @bug 6227608
26 * @summary Test proper handling of flush()
27 * @modules jdk.charsets
28 * @author Martin Buchholz
29 */
30
31import java.util.*;
32import java.io.*;
33import java.nio.*;
34import java.nio.charset.*;
35
36public class Flush {
37    private static byte[] contents(ByteBuffer bb) {
38        byte[] contents = new byte[bb.position()];
39        bb.duplicate().flip().get(contents);
40        return contents;
41    }
42
43    private static ByteBuffer extend(ByteBuffer bb) {
44        ByteBuffer x = ByteBuffer.allocate(2*bb.capacity()+10);
45        bb.flip();
46        x.put(bb);
47        return x;
48    }
49
50    private static void realMain(String[] args) throws Throwable {
51        // A japanese character should decode as a 3-byte
52        // switch-to-japanese escape sequence, followed by a 2-byte
53        // encoding of the char itself, followed by a 3-byte return to
54        // ASCII escape sequence.
55        char[] jis0208 = {'\u3001'};
56        CharBuffer cb = CharBuffer.wrap(jis0208);
57        ByteBuffer bb = ByteBuffer.allocate(6);
58        CharsetEncoder enc = Charset.forName("ISO-2022-JP").newEncoder();
59
60        check(enc.encode(cb, bb, true).isUnderflow());
61
62        System.out.println(Arrays.toString(contents(bb)));
63        check(! cb.hasRemaining());
64        equal(contents(bb).length, 3 + 2);
65        equal(bb.get(0), (byte)0x1b);
66
67        //----------------------------------------------------------------
68        // We must be able to recover if flush() returns OVERFLOW
69        //----------------------------------------------------------------
70        check(enc.flush(bb).isOverflow());
71        check(enc.flush(bb).isOverflow());
72        equal(contents(bb).length, 3 + 2);
73
74        bb = extend(bb);
75
76        check(enc.flush(bb).isUnderflow());
77        equal(bb.get(3 + 2), (byte)0x1b);
78        System.out.println(Arrays.toString(contents(bb)));
79        equal(contents(bb).length, 3 + 2 + 3);
80
81        //----------------------------------------------------------------
82        // A final redundant flush() is a no-op
83        //----------------------------------------------------------------
84        check(enc.flush(bb).isUnderflow());
85        check(enc.flush(bb).isUnderflow());
86        equal(contents(bb).length, 3 + 2 + 3);
87
88        //----------------------------------------------------------------
89        // CharsetEncoder.encode(ByteBuffer) must call flush(ByteBuffer)
90        //----------------------------------------------------------------
91        bb = enc.encode(CharBuffer.wrap(jis0208));
92        byte[] expected = "\u001b$B!\"\u001b(B".getBytes("ASCII");
93        byte[] contents = new byte[bb.limit()]; bb.get(contents);
94        check(Arrays.equals(contents, expected));
95    }
96
97    //--------------------- Infrastructure ---------------------------
98    static volatile int passed = 0, failed = 0;
99    static void pass() { passed++; }
100    static void fail() { failed++; Thread.dumpStack(); }
101    static void fail(String msg) { System.out.println(msg); fail(); }
102    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
103    static void check(boolean cond) { if (cond) pass(); else fail(); }
104    static void equal(Object x, Object y) {
105        if (x == null ? y == null : x.equals(y)) pass();
106        else {System.out.println(x + " not equal to " + y); fail(); }}
107
108    public static void main(String[] args) throws Throwable {
109        try { realMain(args); } catch (Throwable t) { unexpected(t); }
110
111        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
112        if (failed > 0) throw new Exception("Some tests failed");
113    }
114}
115