com.feilong.lib.compress.archivers.zip.ZipSplitReadOnlySeekableByteChannel Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.feilong.lib.compress.archivers.zip;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import java.util.regex.Pattern;
import com.feilong.lib.compress.utils.FileNameUtils;
import com.feilong.lib.compress.utils.MultiReadOnlySeekableByteChannel;
/**
* {@link MultiReadOnlySeekableByteChannel} that knows what a split ZIP archive should look like.
*
*
* If you want to read a split archive using {@link ZipFile} then create an instance of this class from the parts of
* the archive.
*
*
* @since 1.20
*/
public class ZipSplitReadOnlySeekableByteChannel extends MultiReadOnlySeekableByteChannel{
private static final int ZIP_SPLIT_SIGNATURE_LENGTH = 4;
private final ByteBuffer zipSplitSignatureByteBuffer = ByteBuffer.allocate(ZIP_SPLIT_SIGNATURE_LENGTH);
/**
* Concatenates the given channels.
*
*
* The channels should be add in ascending order, e.g. z01,
* z02, ... z99, zip please note that the .zip file is the last
* segment and should be added as the last one in the channels
*
*
* @param channels
* the channels to concatenate
* @throws NullPointerException
* if channels is null
* @throws IOException
* if the first channel doesn't seem to hold
* the beginning of a split archive
*/
public ZipSplitReadOnlySeekableByteChannel(List channels) throws IOException{
super(channels);
// the first split zip segment should begin with zip split signature
assertSplitSignature(channels);
}
/**
* Based on the zip specification:
*
*
* 8.5.3 Spanned/Split archives created using PKZIP for Windows
* (V2.50 or greater), PKZIP Command Line (V2.50 or greater),
* or PKZIP Explorer will include a special spanning
* signature as the first 4 bytes of the first segment of
* the archive. This signature (0x08074b50) will be
* followed immediately by the local header signature for
* the first file in the archive.
*
*
* the first 4 bytes of the first zip split segment should be the zip split signature(0x08074B50)
*
* @param channels
* channels to be valided
* @throws IOException
*/
private void assertSplitSignature(final List channels) throws IOException{
SeekableByteChannel channel = channels.get(0);
// the zip split file signature is at the beginning of the first split segment
channel.position(0L);
zipSplitSignatureByteBuffer.rewind();
channel.read(zipSplitSignatureByteBuffer);
final ZipLong signature = new ZipLong(zipSplitSignatureByteBuffer.array());
if (!signature.equals(ZipLong.DD_SIG)){
channel.position(0L);
throw new IOException("The first zip split segment does not begin with split zip file signature");
}
channel.position(0L);
}
/**
* Concatenates the given channels.
*
* @param channels
* the channels to concatenate, note that the LAST CHANNEL of channels should be the LAST SEGMENT(.zip)
* and theses channels should be added in correct order (e.g. .z01, .z02... .z99, .zip)
* @return SeekableByteChannel that concatenates all provided channels
* @throws NullPointerException
* if channels is null
* @throws IOException
* if reading channels fails
*/
public static SeekableByteChannel forOrderedSeekableByteChannels(SeekableByteChannel...channels) throws IOException{
if (Objects.requireNonNull(channels, "channels must not be null").length == 1){
return channels[0];
}
return new ZipSplitReadOnlySeekableByteChannel(Arrays.asList(channels));
}
/**
* Concatenates the given channels.
*
* @param lastSegmentChannel
* channel of the last segment of split zip segments, its extension should be .zip
* @param channels
* the channels to concatenate except for the last segment,
* note theses channels should be added in correct order (e.g. .z01, .z02... .z99)
* @return SeekableByteChannel that concatenates all provided channels
* @throws NullPointerException
* if lastSegmentChannel or channels is null
* @throws IOException
* if the first channel doesn't seem to hold
* the beginning of a split archive
*/
public static SeekableByteChannel forOrderedSeekableByteChannels(
SeekableByteChannel lastSegmentChannel,
Iterable channels) throws IOException{
Objects.requireNonNull(channels, "channels");
Objects.requireNonNull(lastSegmentChannel, "lastSegmentChannel");
List channelsList = new ArrayList<>();
for (SeekableByteChannel channel : channels){
channelsList.add(channel);
}
channelsList.add(lastSegmentChannel);
SeekableByteChannel[] channelArray = new SeekableByteChannel[channelsList.size()];
return forOrderedSeekableByteChannels(channelsList.toArray(channelArray));
}
/**
* Concatenates zip split files from the last segment(the extension SHOULD be .zip)
*
* @param lastSegmentFile
* the last segment of zip split files, note that the extension SHOULD be .zip
* @return SeekableByteChannel that concatenates all zip split files
* @throws IllegalArgumentException
* if the lastSegmentFile's extension is NOT .zip
* @throws IOException
* if the first channel doesn't seem to hold
* the beginning of a split archive
*/
public static SeekableByteChannel buildFromLastSplitSegment(File lastSegmentFile) throws IOException{
String extension = FileNameUtils.getExtension(lastSegmentFile.getCanonicalPath());
if (!extension.equalsIgnoreCase("zip")){
throw new IllegalArgumentException("The extension of last zip split segment should be .zip");
}
File parent = lastSegmentFile.getParentFile();
String fileBaseName = FileNameUtils.getBaseName(lastSegmentFile.getCanonicalPath());
ArrayList splitZipSegments = new ArrayList<>();
// zip split segments should be like z01,z02....z(n-1) based on the zip specification
Pattern pattern = Pattern.compile(Pattern.quote(fileBaseName) + ".[zZ][0-9]+");
final File[] children = parent.listFiles();
if (children != null){
for (File file : children){
if (!pattern.matcher(file.getName()).matches()){
continue;
}
splitZipSegments.add(file);
}
}
Collections.sort(splitZipSegments, new ZipSplitSegmentComparator());
return forFiles(lastSegmentFile, splitZipSegments);
}
/**
* Concatenates the given files.
*
* @param files
* the files to concatenate, note that the LAST FILE of files should be the LAST SEGMENT(.zip)
* and theses files should be added in correct order (e.g. .z01, .z02... .z99, .zip)
* @return SeekableByteChannel that concatenates all provided files
* @throws NullPointerException
* if files is null
* @throws IOException
* if opening a channel for one of the files fails
* @throws IOException
* if the first channel doesn't seem to hold
* the beginning of a split archive
*/
public static SeekableByteChannel forFiles(File...files) throws IOException{
List channels = new ArrayList<>();
for (File f : Objects.requireNonNull(files, "files must not be null")){
channels.add(Files.newByteChannel(f.toPath(), StandardOpenOption.READ));
}
if (channels.size() == 1){
return channels.get(0);
}
return new ZipSplitReadOnlySeekableByteChannel(channels);
}
/**
* Concatenates the given files.
*
* @param lastSegmentFile
* the last segment of split zip segments, its extension should be .zip
* @param files
* the files to concatenate except for the last segment,
* note theses files should be added in correct order (e.g. .z01, .z02... .z99)
* @return SeekableByteChannel that concatenates all provided files
* @throws IOException
* if the first channel doesn't seem to hold
* the beginning of a split archive
* @throws NullPointerException
* if files or lastSegmentFile is null
*/
public static SeekableByteChannel forFiles(File lastSegmentFile,Iterable files) throws IOException{
Objects.requireNonNull(files, "files");
Objects.requireNonNull(lastSegmentFile, "lastSegmentFile");
List filesList = new ArrayList<>();
for (File f : files){
filesList.add(f);
}
filesList.add(lastSegmentFile);
File[] filesArray = new File[filesList.size()];
return forFiles(filesList.toArray(filesArray));
}
private static class ZipSplitSegmentComparator implements Comparator,Serializable{
private static final long serialVersionUID = 20200123L;
@Override
public int compare(File file1,File file2){
String extension1 = FileNameUtils.getExtension(file1.getPath());
String extension2 = FileNameUtils.getExtension(file2.getPath());
if (!extension1.startsWith("z")){
return -1;
}
if (!extension2.startsWith("z")){
return 1;
}
Integer splitSegmentNumber1 = Integer.parseInt(extension1.substring(1));
Integer splitSegmentNumber2 = Integer.parseInt(extension2.substring(1));
return splitSegmentNumber1.compareTo(splitSegmentNumber2);
}
}
}