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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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 org.apache.commons.compress.harmony.pack200;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TimeZone;
import org.apache.commons.compress.harmony.pack200.Archive.PackingFile;
import org.apache.commons.compress.harmony.pack200.Archive.SegmentUnit;
import org.objectweb.asm.ClassReader;
/**
* Bands containing information about files in the pack200 archive and the file contents for non-class-files.
* Corresponds to the file_bands set of bands described in the specification.
*/
public class FileBands extends BandSet {
private final CPUTF8[] fileName;
private int[] file_name;
private final int[] file_modtime;
private final long[] file_size;
private final int[] file_options;
private final byte[][] file_bits;
private final List fileList;
private final PackingOptions options;
private final CpBands cpBands;
public FileBands(final CpBands cpBands, final SegmentHeader segmentHeader, final PackingOptions options,
final SegmentUnit segmentUnit, final int effort) {
super(effort, segmentHeader);
fileList = segmentUnit.getFileList();
this.options = options;
this.cpBands = cpBands;
final int size = fileList.size();
fileName = new CPUTF8[size];
file_modtime = new int[size];
file_size = new long[size];
file_options = new int[size];
int totalSize = 0;
file_bits = new byte[size][];
final int archiveModtime = segmentHeader.getArchive_modtime();
final Set classNames = new HashSet();
for (final Iterator iterator = segmentUnit.getClassList().iterator(); iterator.hasNext();) {
final ClassReader reader = (ClassReader) iterator.next();
classNames.add(reader.getClassName());
}
final CPUTF8 emptyString = cpBands.getCPUtf8("");
long modtime;
int latestModtime = Integer.MIN_VALUE;
final boolean isLatest = !PackingOptions.KEEP.equals(options.getModificationTime());
for (int i = 0; i < size; i++) {
final PackingFile packingFile = (PackingFile) fileList.get(i);
final String name = packingFile.getName();
if (name.endsWith(".class") && !options.isPassFile(name)) {
file_options[i] |= (1 << 1);
if (classNames.contains(name.substring(0, name.length() - 6))) {
fileName[i] = emptyString;
} else {
fileName[i] = cpBands.getCPUtf8(name);
}
} else {
fileName[i] = cpBands.getCPUtf8(name);
}
// set deflate_hint for file element
if (options.isKeepDeflateHint() && packingFile.isDefalteHint()) {
file_options[i] |= 0x1;
}
final byte[] bytes = packingFile.getContents();
file_size[i] = bytes.length;
totalSize += file_size[i];
// update modification time
modtime = (packingFile.getModtime() + TimeZone.getDefault().getRawOffset()) / 1000L;
file_modtime[i] = (int) (modtime - archiveModtime);
if (isLatest && latestModtime < file_modtime[i]) {
latestModtime = file_modtime[i];
}
file_bits[i] = packingFile.getContents();
}
if (isLatest) {
for (int index = 0; index < size; index++) {
file_modtime[index] = latestModtime;
}
}
}
/**
* All input classes for the segment have now been read in, so this method is called so that this class can
* calculate/complete anything it could not do while classes were being read.
*/
public void finaliseBands() {
file_name = new int[fileName.length];
for (int i = 0; i < file_name.length; i++) {
if (fileName[i].equals(cpBands.getCPUtf8(""))) {
final PackingFile packingFile = (PackingFile) fileList.get(i);
final String name = packingFile.getName();
if (options.isPassFile(name)) {
fileName[i] = cpBands.getCPUtf8(name);
file_options[i] &= (1 << 1) ^ 0xFFFFFFFF;
}
}
file_name[i] = fileName[i].getIndex();
}
}
@Override
public void pack(final OutputStream out) throws IOException, Pack200Exception {
PackingUtils.log("Writing file bands...");
byte[] encodedBand = encodeBandInt("file_name", file_name, Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_name[" + file_name.length + "]");
encodedBand = encodeFlags("file_size", file_size, Codec.UNSIGNED5, Codec.UNSIGNED5,
segmentHeader.have_file_size_hi());
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_size[" + file_size.length + "]");
if (segmentHeader.have_file_modtime()) {
encodedBand = encodeBandInt("file_modtime", file_modtime, Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_modtime[" + file_modtime.length + "]");
}
if (segmentHeader.have_file_options()) {
encodedBand = encodeBandInt("file_options", file_options, Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_options[" + file_options.length + "]");
}
encodedBand = encodeBandInt("file_bits", flatten(file_bits), Codec.BYTE1);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_bits[" + file_bits.length + "]");
}
private int[] flatten(final byte[][] bytes) {
int total = 0;
for (int i = 0; i < bytes.length; i++) {
total += bytes[i].length;
}
final int[] band = new int[total];
int index = 0;
for (int i = 0; i < bytes.length; i++) {
for (int j = 0; j < bytes[i].length; j++) {
band[index++] = bytes[i][j] & 0xFF;
}
}
return band;
}
}