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 * http://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 package org.apache.commons.compress.archivers.zip;
20
21 import java.io.IOException;
22 import java.nio.ByteBuffer;
23 import java.nio.channels.FileChannel;
24 import java.nio.channels.SeekableByteChannel;
25
26 /**
27 * IO utilities for Zip operations.
28 */
29 // Keep package-private; consider for Apache Commons IO.
30 class ZipIoUtil {
31
32 /**
33 * Writes full buffer to channel.
34 *
35 * @param channel channel to write to
36 * @param buf buffer to write
37 * @throws IOException when writing fails or fails to write fully
38 */
39 static void writeFully(final SeekableByteChannel channel, final ByteBuffer buf) throws IOException {
40 while (buf.hasRemaining()) {
41 final int remaining = buf.remaining();
42 final int written = channel.write(buf);
43 if (written <= 0) {
44 throw new IOException("Failed to fully write: channel=" + channel + " length=" + remaining + " written=" + written);
45 }
46 }
47 }
48
49 /**
50 * Writes full buffer to channel at specified position.
51 *
52 * @param channel channel to write to
53 * @param buf buffer to write
54 * @param position position to write at
55 * @throws IOException when writing fails or fails to write fully
56 */
57 static void writeFullyAt(final FileChannel channel, final ByteBuffer buf, final long position) throws IOException {
58 for (long currentPosition = position; buf.hasRemaining();) {
59 final int remaining = buf.remaining();
60 final int written = channel.write(buf, currentPosition);
61 if (written <= 0) {
62 throw new IOException("Failed to fully write: channel=" + channel + " length=" + remaining + " written=" + written);
63 }
64 currentPosition += written;
65 }
66 }
67
68 private ZipIoUtil() {
69 }
70 }