1 /*
2 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /**
27 * IOUtils: A collection of IO-related public static methods.
28 */
29
30 package sun.misc;
31
32 import java.io.EOFException;
33 import java.io.IOException;
34 import java.io.InputStream;
35 import java.util.Arrays;
36
37 public class IOUtils {
38
39 /**
40 * Read up to <code>length</code> of bytes from <code>in</code>
41 * until EOF is detected.
42 * @param in input stream, must not be null
43 * @param length number of bytes to read, -1 or Integer.MAX_VALUE means
44 * read as much as possible
45 * @param readAll if true, an EOFException will be thrown if not enough
46 * bytes are read. Ignored when length is -1 or Integer.MAX_VALUE
47 * @return bytes read
48 * @throws IOException Any IO error or a premature EOF is detected
49 */
50 public static byte[] readFully(InputStream is, int length, boolean readAll)
51 throws IOException {
52 byte[] output = {};
53 if (length == -1) length = Integer.MAX_VALUE;
54 int pos = 0;
55 while (pos < length) {
56 int bytesToRead;
57 if (pos >= output.length) { // Only expand when there's no room
58 bytesToRead = Math.min(length - pos, output.length + 1024);
59 if (output.length < pos + bytesToRead) {
60 output = Arrays.copyOf(output, pos + bytesToRead);
61 }
62 } else {
63 bytesToRead = output.length - pos;
64 }
65 int cc = is.read(output, pos, bytesToRead);
66 if (cc < 0) {
67 if (readAll && length != Integer.MAX_VALUE) {
68 throw new EOFException("Detect premature EOF");
69 } else {
70 if (output.length != pos) {
71 output = Arrays.copyOf(output, pos);
72 }
73 break;
74 }
75 }
76 pos += cc;
77 }
78 return output;
79 }
80 }
|
1 /*
2 * Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /**
27 * IOUtils: A collection of IO-related public static methods.
28 */
29
30 package sun.misc;
31
32 import java.io.EOFException;
33 import java.io.IOException;
34 import java.io.InputStream;
35 import java.util.Arrays;
36
37 public class IOUtils {
38
39 /**
40 * Read up to {@code length} of bytes from {@code in}
41 * until EOF is detected.
42 * @param is input stream, must not be null
43 * @param length number of bytes to read, -1 or Integer.MAX_VALUE means
44 * read as much as possible
45 * @param readAll if true, an EOFException will be thrown if not enough
46 * bytes are read. Ignored when length is -1 or Integer.MAX_VALUE
47 * @return bytes read
48 * @throws IOException Any IO error or a premature EOF is detected
49 */
50 public static byte[] readFully(InputStream is, int length, boolean readAll)
51 throws IOException {
52 byte[] output = {};
53 if (length == -1) length = Integer.MAX_VALUE;
54 int pos = 0;
55 while (pos < length) {
56 int bytesToRead;
57 if (pos >= output.length) { // Only expand when there's no room
58 bytesToRead = Math.min(length - pos, output.length + 1024);
59 if (output.length < pos + bytesToRead) {
60 output = Arrays.copyOf(output, pos + bytesToRead);
61 }
62 } else {
63 bytesToRead = output.length - pos;
64 }
65 int cc = is.read(output, pos, bytesToRead);
66 if (cc < 0) {
67 if (readAll && length != Integer.MAX_VALUE) {
68 throw new EOFException("Detect premature EOF");
69 } else {
70 if (output.length != pos) {
71 output = Arrays.copyOf(output, pos);
72 }
73 break;
74 }
75 }
76 pos += cc;
77 }
78 return output;
79 }
80
81 /**
82 * Read {@code length} of bytes from {@code in}. An exception is
83 * thrown if there are not enough bytes in the stream.
84 *
85 * @param is input stream, must not be null
86 * @param length number of bytes to read, must not be negative
87 * @return bytes read
88 * @throws IOException if any IO error or a premature EOF is detected, or
89 * if {@code length} is negative since this length is usually also
90 * read from {@code is}.
91 */
92 public static byte[] readNBytes(InputStream is, int length) throws IOException {
93 if (length < 0) {
94 throw new IOException("length cannot be negative: " + length);
95 }
96 return readFully(is, length, true);
97 }
98 }
|