1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (c) 2021, 2022, 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
* @bug 8271308
* @summary Verify that transferTo() copies more than Integer.MAX_VALUE bytes
* @library .. /test/lib
* @build jdk.test.lib.Platform jdk.test.lib.RandomFactory FileChannelUtils
* @run main/othervm/timeout=300 Transfer2GPlus
* @key randomness
*/
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import jdk.test.lib.Platform;
import jdk.test.lib.RandomFactory;
import static java.nio.file.StandardOpenOption.*;
public class Transfer2GPlus {
private static final long BASE = (long)Integer.MAX_VALUE;
private static final int EXTRA = 1024;
private static final long LENGTH = BASE + EXTRA;
private static final Random GEN = RandomFactory.getRandom();
public static void main(String[] args) throws IOException {
Path src = FileChannelUtils.createSparseTempFile("src", ".dat");
src.toFile().deleteOnExit();
long t0 = System.nanoTime();
byte[] b = createSrcFile(src);
long t1 = System.nanoTime();
System.out.printf(" Wrote large file in %d ns (%d ms) %n",
t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));
t0 = t1;
testToFileChannel(src, b);
t1 = System.nanoTime();
System.out.printf(" Copied to file channel in %d ns (%d ms) %n",
t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));
t0 = t1;
testToWritableByteChannel(src, b);
t1 = System.nanoTime();
System.out.printf(" Copied to byte channel in %d ns (%d ms) %n",
t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));
}
// Create a file of size LENGTH with EXTRA random bytes at offset BASE.
private static byte[] createSrcFile(Path src)
throws IOException {
try (FileChannel fc = FileChannel.open(src, WRITE)) {
fc.position(BASE);
byte[] b = new byte[EXTRA];
GEN.nextBytes(b);
fc.write(ByteBuffer.wrap(b));
return b;
}
}
// Exercises transferToDirectly() on Linux and transferToTrustedChannel()
// on macOS and Windows.
private static void testToFileChannel(Path src, byte[] expected)
throws IOException {
Path dst = Files.createTempFile("dst", ".dat");
dst.toFile().deleteOnExit();
try (FileChannel srcCh = FileChannel.open(src)) {
try (FileChannel dstCh = FileChannel.open(dst, READ, WRITE)) {
long total = 0L;
if ((total = srcCh.transferTo(0, LENGTH, dstCh)) < LENGTH) {
if (!Platform.isLinux())
throw new RuntimeException("Transfer too small: " + total);
// If this point is reached we're on Linux which cannot
// transfer all LENGTH bytes in one call to sendfile(2),
// so loop to get the rest.
do {
long n = srcCh.transferTo(total, LENGTH, dstCh);
if (n == 0)
break;
total += n;
} while (total < LENGTH);
}
if (dstCh.size() < LENGTH)
throw new RuntimeException("Target file too small: " +
dstCh.size() + " < " + LENGTH);
System.out.println("Transferred " + total + " bytes");
dstCh.position(BASE);
ByteBuffer bb = ByteBuffer.allocate(EXTRA);
dstCh.read(bb);
if (!Arrays.equals(bb.array(), expected))
throw new RuntimeException("Unexpected values");
}
}
}
// Exercises transferToArbitraryChannel() on all platforms.
private static void testToWritableByteChannel(Path src, byte[] expected)
throws IOException {
// transfer src to channel that is not FileChannelImpl
try (FileChannel srcCh = FileChannel.open(src);
ByteArrayOutputStream baos = new ByteArrayOutputStream(EXTRA);
OutputStream os = new SkipBytesStream(baos, BASE);
WritableByteChannel wbc = Channels.newChannel(os)){
long n;
if ((n = srcCh.transferTo(0, LENGTH, wbc)) < LENGTH)
throw new RuntimeException("Too few bytes transferred: " +
n + " < " + LENGTH);
System.out.println("Transferred " + n + " bytes");
byte[] b = baos.toByteArray();
if (!Arrays.equals(b, expected))
throw new RuntimeException("Unexpected values");
}
}
/**
* Stream that discards the first bytesToSkip bytes, then passes through
*/
static class SkipBytesStream extends FilterOutputStream {
private long bytesToSkip;
public SkipBytesStream(OutputStream out, long bytesToSkip) {
super(out);
this.bytesToSkip = bytesToSkip;
}
@Override
public void write(int b) throws IOException {
if (bytesToSkip > 0) {
bytesToSkip--;
} else {
super.write(b);
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
// check copied from FilterOutputStream
if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
throw new IndexOutOfBoundsException();
if (bytesToSkip >= len) {
bytesToSkip -= len;
} else {
int skip = (int)bytesToSkip;
bytesToSkip = 0;
super.write(b, off + skip, len - skip);
}
}
}
}
|
