1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.commons.compress.archivers.zip;
21
22 import java.io.IOException;
23 import java.nio.ByteBuffer;
24 import java.nio.channels.FileChannel;
25 import java.nio.channels.WritableByteChannel;
26
27 /**
28 * IO utilities for Zip operations.
29 */
30 // Keep package-private; consider for Apache Commons IO.
31 final class ZipIoUtil {
32
33 /**
34 * Writes all bytes in a buffer to a channel at specified position.
35 *
36 * @param channel The target channel.
37 * @param buffer The source bytes.
38 * @param position The file position at which the transfer is to begin; must be non-negative
39 * @throws IOException If some I/O error occurs or fails or fails to write all bytes.
40 */
41 static void writeAll(final FileChannel channel, final ByteBuffer buffer, final long position) throws IOException {
42 for (long currentPos = position; buffer.hasRemaining();) {
43 final int remaining = buffer.remaining();
44 final int written = channel.write(buffer, currentPos);
45 if (written == 0) {
46 // A non-blocking channel
47 Thread.yield();
48 continue;
49 }
50 if (written < 0) {
51 throw new IOException("Failed to write all bytes in the buffer for channel=" + channel + ", length=" + remaining + ", written=" + written);
52 }
53 currentPos += written;
54 }
55 }
56
57 /**
58 * Writes all bytes in a buffer to a channel.
59 *
60 * @param channel The target channel.
61 * @param buffer The source bytes.
62 * @throws IOException If some I/O error occurs or fails or fails to write all bytes.
63 */
64 static void writeAll(final WritableByteChannel channel, final ByteBuffer buffer) throws IOException {
65 while (buffer.hasRemaining()) {
66 final int remaining = buffer.remaining();
67 final int written = channel.write(buffer);
68 if (written == 0) {
69 // A non-blocking channel
70 Thread.yield();
71 continue;
72 }
73 if (written < 0) {
74 throw new IOException("Failed to write all bytes in the buffer for channel=" + channel + ", length=" + remaining + ", written=" + written);
75 }
76 }
77 }
78
79 private ZipIoUtil() {
80 }
81 }