org.apache.commons.compress.archivers.sevenz.SevenZOutputFile Maven / Gradle / Ivy
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Apache Commons Compress 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.archivers.sevenz;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Date;
import java.util.List;
import java.util.zip.CRC32;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.utils.CountingOutputStream;
/**
* Writes a 7z file.
* @since 1.6
*/
public class SevenZOutputFile implements Closeable {
private final RandomAccessFile file;
private final List files = new ArrayList();
private int numNonEmptyStreams = 0;
private CRC32 crc32 = new CRC32();
private CRC32 compressedCrc32 = new CRC32();
private long fileBytesWritten = 0;
private boolean finished = false;
private CountingOutputStream currentOutputStream;
private SevenZMethod contentCompression = SevenZMethod.LZMA2;
/**
* Opens file to write a 7z archive to.
*
* @param filename name of the file to write to
* @throws IOException if opening the file fails
*/
public SevenZOutputFile(final File filename) throws IOException {
file = new RandomAccessFile(filename, "rw");
file.seek(SevenZFile.SIGNATURE_HEADER_SIZE);
}
/**
* Sets the compression method to use for entry contents - the
* default is LZMA2.
*
* Currently only {@link SevenZMethod#COPY}, {@link
* SevenZMethod#LZMA2}, {@link SevenZMethod#BZIP2} and {@link
* SevenZMethod#DEFLATE} are supported.
*/
public void setContentCompression(SevenZMethod method) {
this.contentCompression = method;
}
/**
* Closes the archive, calling {@link #finish} if necessary.
*
* @throws IOException
*/
public void close() throws IOException {
if (!finished) {
finish();
}
file.close();
}
/**
* Create an archive entry using the inputFile and entryName provided.
*
* @param inputFile
* @param entryName
* @return the ArchiveEntry set up with details from the file
*
* @throws IOException
*/
public SevenZArchiveEntry createArchiveEntry(final File inputFile,
final String entryName) throws IOException {
final SevenZArchiveEntry entry = new SevenZArchiveEntry();
entry.setDirectory(inputFile.isDirectory());
entry.setName(entryName);
entry.setLastModifiedDate(new Date(inputFile.lastModified()));
return entry;
}
/**
* Records an archive entry to add.
*
* The caller must then write the content to the archive and call
* {@link #closeArchiveEntry()} to complete the process.
*
* @param archiveEntry describes the entry
* @throws IOException
*/
public void putArchiveEntry(final ArchiveEntry archiveEntry) throws IOException {
final SevenZArchiveEntry entry = (SevenZArchiveEntry) archiveEntry;
files.add(entry);
}
/**
* Closes the archive entry.
* @throws IOException
*/
public void closeArchiveEntry() throws IOException {
if (currentOutputStream != null) {
currentOutputStream.flush();
currentOutputStream.close();
}
final SevenZArchiveEntry entry = files.get(files.size() - 1);
if (fileBytesWritten > 0) {
entry.setHasStream(true);
++numNonEmptyStreams;
entry.setSize(currentOutputStream.getBytesWritten());
entry.setCompressedSize(fileBytesWritten);
entry.setCrcValue(crc32.getValue());
entry.setCompressedCrcValue(compressedCrc32.getValue());
entry.setHasCrc(true);
} else {
entry.setHasStream(false);
entry.setSize(0);
entry.setCompressedSize(0);
entry.setHasCrc(false);
}
currentOutputStream = null;
crc32.reset();
compressedCrc32.reset();
fileBytesWritten = 0;
}
/**
* Writes a byte to the current archive entry.
* @param b The byte to be written.
* @throws IOException on error
*/
public void write(final int b) throws IOException {
getCurrentOutputStream().write(b);
}
/**
* Writes a byte array to the current archive entry.
* @param b The byte array to be written.
* @throws IOException on error
*/
public void write(final byte[] b) throws IOException {
write(b, 0, b.length);
}
/**
* Writes part of a byte array to the current archive entry.
* @param b The byte array to be written.
* @param off offset into the array to start writing from
* @param len number of bytes to write
* @throws IOException on error
*/
public void write(final byte[] b, final int off, final int len) throws IOException {
if (len > 0) {
getCurrentOutputStream().write(b, off, len);
}
}
/**
* Finishes the addition of entries to this archive, without closing it.
*
* @throws IOException if archive is already closed.
*/
public void finish() throws IOException {
if (finished) {
throw new IOException("This archive has already been finished");
}
finished = true;
final long headerPosition = file.getFilePointer();
final ByteArrayOutputStream headerBaos = new ByteArrayOutputStream();
final DataOutputStream header = new DataOutputStream(headerBaos);
writeHeader(header);
header.flush();
final byte[] headerBytes = headerBaos.toByteArray();
file.write(headerBytes);
final CRC32 crc32 = new CRC32();
// signature header
file.seek(0);
file.write(SevenZFile.sevenZSignature);
// version
file.write(0);
file.write(2);
// start header
final ByteArrayOutputStream startHeaderBaos = new ByteArrayOutputStream();
final DataOutputStream startHeaderStream = new DataOutputStream(startHeaderBaos);
startHeaderStream.writeLong(Long.reverseBytes(headerPosition - SevenZFile.SIGNATURE_HEADER_SIZE));
startHeaderStream.writeLong(Long.reverseBytes(0xffffFFFFL & headerBytes.length));
crc32.reset();
crc32.update(headerBytes);
startHeaderStream.writeInt(Integer.reverseBytes((int)crc32.getValue()));
startHeaderStream.flush();
final byte[] startHeaderBytes = startHeaderBaos.toByteArray();
crc32.reset();
crc32.update(startHeaderBytes);
file.writeInt(Integer.reverseBytes((int) crc32.getValue()));
file.write(startHeaderBytes);
}
/*
* Creation of output stream is deferred until data is actually
* written as some codecs might write header information even for
* empty streams and directories otherwise.
*/
private OutputStream getCurrentOutputStream() throws IOException {
if (currentOutputStream == null) {
currentOutputStream = setupFileOutputStream();
}
return currentOutputStream;
}
private CountingOutputStream setupFileOutputStream() throws IOException {
OutputStream out = new OutputStreamWrapper();
return new CountingOutputStream(Coders
.addEncoder(out,
contentCompression,
null)) {
@Override
public void write(final int b) throws IOException {
super.write(b);
crc32.update(b);
}
@Override
public void write(final byte[] b) throws IOException {
super.write(b);
crc32.update(b);
}
@Override
public void write(final byte[] b, final int off, final int len)
throws IOException {
super.write(b, off, len);
crc32.update(b, off, len);
}
};
}
private void writeHeader(final DataOutput header) throws IOException {
header.write(NID.kHeader);
header.write(NID.kMainStreamsInfo);
writeStreamsInfo(header);
writeFilesInfo(header);
header.write(NID.kEnd);
}
private void writeStreamsInfo(final DataOutput header) throws IOException {
if (numNonEmptyStreams > 0) {
writePackInfo(header);
writeUnpackInfo(header);
}
writeSubStreamsInfo(header);
header.write(NID.kEnd);
}
private void writePackInfo(final DataOutput header) throws IOException {
header.write(NID.kPackInfo);
writeUint64(header, 0);
writeUint64(header, 0xffffFFFFL & numNonEmptyStreams);
header.write(NID.kSize);
for (final SevenZArchiveEntry entry : files) {
if (entry.hasStream()) {
writeUint64(header, entry.getCompressedSize());
}
}
header.write(NID.kCRC);
header.write(1);
for (final SevenZArchiveEntry entry : files) {
if (entry.hasStream()) {
header.writeInt(Integer.reverseBytes((int) entry.getCompressedCrcValue()));
}
}
header.write(NID.kEnd);
}
private void writeUnpackInfo(final DataOutput header) throws IOException {
header.write(NID.kUnpackInfo);
header.write(NID.kFolder);
writeUint64(header, numNonEmptyStreams);
header.write(0);
for (int i = 0; i < numNonEmptyStreams; i++) {
writeFolder(header);
}
header.write(NID.kCodersUnpackSize);
for (final SevenZArchiveEntry entry : files) {
if (entry.hasStream()) {
writeUint64(header, entry.getSize());
}
}
header.write(NID.kCRC);
header.write(1);
for (final SevenZArchiveEntry entry : files) {
if (entry.hasStream()) {
header.writeInt(Integer.reverseBytes((int) entry.getCrcValue()));
}
}
header.write(NID.kEnd);
}
private void writeFolder(final DataOutput header) throws IOException {
// one coder
writeUint64(header, 1);
byte[] id = contentCompression.getId();
byte[] properties = contentCompression.getProperties();
int codecFlags = id.length;
if (properties.length > 0) {
codecFlags |= 0x20;
}
header.write(codecFlags);
header.write(id);
if (properties.length > 0) {
header.write(properties.length);
header.write(properties);
}
}
private void writeSubStreamsInfo(final DataOutput header) throws IOException {
header.write(NID.kSubStreamsInfo);
//
// header.write(NID.kCRC);
// header.write(1);
// for (final SevenZArchiveEntry entry : files) {
// if (entry.getHasCrc()) {
// header.writeInt(Integer.reverseBytes(entry.getCrc()));
// }
// }
//
header.write(NID.kEnd);
}
private void writeFilesInfo(final DataOutput header) throws IOException {
header.write(NID.kFilesInfo);
writeUint64(header, files.size());
writeFileEmptyStreams(header);
writeFileEmptyFiles(header);
writeFileAntiItems(header);
writeFileNames(header);
writeFileCTimes(header);
writeFileATimes(header);
writeFileMTimes(header);
writeFileWindowsAttributes(header);
header.write(0);
}
private void writeFileEmptyStreams(final DataOutput header) throws IOException {
boolean hasEmptyStreams = false;
for (final SevenZArchiveEntry entry : files) {
if (!entry.hasStream()) {
hasEmptyStreams = true;
break;
}
}
if (hasEmptyStreams) {
header.write(NID.kEmptyStream);
final BitSet emptyStreams = new BitSet(files.size());
for (int i = 0; i < files.size(); i++) {
emptyStreams.set(i, !files.get(i).hasStream());
}
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
writeBits(out, emptyStreams, files.size());
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileEmptyFiles(final DataOutput header) throws IOException {
boolean hasEmptyFiles = false;
int emptyStreamCounter = 0;
final BitSet emptyFiles = new BitSet(0);
for (int i = 0; i < files.size(); i++) {
if (!files.get(i).hasStream()) {
boolean isDir = files.get(i).isDirectory();
emptyFiles.set(emptyStreamCounter++, !isDir);
hasEmptyFiles |= !isDir;
}
}
if (hasEmptyFiles) {
header.write(NID.kEmptyFile);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
writeBits(out, emptyFiles, emptyStreamCounter);
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileAntiItems(final DataOutput header) throws IOException {
boolean hasAntiItems = false;
final BitSet antiItems = new BitSet(0);
int antiItemCounter = 0;
for (int i = 0; i < files.size(); i++) {
if (!files.get(i).hasStream()) {
boolean isAnti = files.get(i).isAntiItem();
antiItems.set(antiItemCounter++, isAnti);
hasAntiItems |= isAnti;
}
}
if (hasAntiItems) {
header.write(NID.kAnti);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
writeBits(out, antiItems, antiItemCounter);
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileNames(final DataOutput header) throws IOException {
header.write(NID.kName);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
out.write(0);
for (final SevenZArchiveEntry entry : files) {
out.write(entry.getName().getBytes("UTF-16LE"));
out.writeShort(0);
}
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
private void writeFileCTimes(final DataOutput header) throws IOException {
int numCreationDates = 0;
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasCreationDate()) {
++numCreationDates;
}
}
if (numCreationDates > 0) {
header.write(NID.kCTime);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
if (numCreationDates != files.size()) {
out.write(0);
final BitSet cTimes = new BitSet(files.size());
for (int i = 0; i < files.size(); i++) {
cTimes.set(i, files.get(i).getHasCreationDate());
}
writeBits(out, cTimes, files.size());
} else {
out.write(1);
}
out.write(0);
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasCreationDate()) {
out.writeLong(Long.reverseBytes(
SevenZArchiveEntry.javaTimeToNtfsTime(entry.getCreationDate())));
}
}
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileATimes(final DataOutput header) throws IOException {
int numAccessDates = 0;
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasAccessDate()) {
++numAccessDates;
}
}
if (numAccessDates > 0) {
header.write(NID.kATime);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
if (numAccessDates != files.size()) {
out.write(0);
final BitSet aTimes = new BitSet(files.size());
for (int i = 0; i < files.size(); i++) {
aTimes.set(i, files.get(i).getHasAccessDate());
}
writeBits(out, aTimes, files.size());
} else {
out.write(1);
}
out.write(0);
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasAccessDate()) {
out.writeLong(Long.reverseBytes(
SevenZArchiveEntry.javaTimeToNtfsTime(entry.getAccessDate())));
}
}
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileMTimes(final DataOutput header) throws IOException {
int numLastModifiedDates = 0;
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasLastModifiedDate()) {
++numLastModifiedDates;
}
}
if (numLastModifiedDates > 0) {
header.write(NID.kMTime);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
if (numLastModifiedDates != files.size()) {
out.write(0);
final BitSet mTimes = new BitSet(files.size());
for (int i = 0; i < files.size(); i++) {
mTimes.set(i, files.get(i).getHasLastModifiedDate());
}
writeBits(out, mTimes, files.size());
} else {
out.write(1);
}
out.write(0);
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasLastModifiedDate()) {
out.writeLong(Long.reverseBytes(
SevenZArchiveEntry.javaTimeToNtfsTime(entry.getLastModifiedDate())));
}
}
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeFileWindowsAttributes(final DataOutput header) throws IOException {
int numWindowsAttributes = 0;
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasWindowsAttributes()) {
++numWindowsAttributes;
}
}
if (numWindowsAttributes > 0) {
header.write(NID.kWinAttributes);
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(baos);
if (numWindowsAttributes != files.size()) {
out.write(0);
final BitSet attributes = new BitSet(files.size());
for (int i = 0; i < files.size(); i++) {
attributes.set(i, files.get(i).getHasWindowsAttributes());
}
writeBits(out, attributes, files.size());
} else {
out.write(1);
}
out.write(0);
for (final SevenZArchiveEntry entry : files) {
if (entry.getHasWindowsAttributes()) {
out.writeInt(Integer.reverseBytes(entry.getWindowsAttributes()));
}
}
out.flush();
final byte[] contents = baos.toByteArray();
writeUint64(header, contents.length);
header.write(contents);
}
}
private void writeUint64(final DataOutput header, long value) throws IOException {
int firstByte = 0;
int mask = 0x80;
int i;
for (i = 0; i < 8; i++) {
if (value < ((1L << ( 7 * (i + 1))))) {
firstByte |= (value >>> (8 * i));
break;
}
firstByte |= mask;
mask >>>= 1;
}
header.write(firstByte);
for (; i > 0; i--) {
header.write((int) (0xff & value));
value >>>= 8;
}
}
private void writeBits(final DataOutput header, final BitSet bits, final int length) throws IOException {
int cache = 0;
int shift = 7;
for (int i = 0; i < length; i++) {
cache |= ((bits.get(i) ? 1 : 0) << shift);
if (--shift < 0) {
header.write(cache);
shift = 7;
cache = 0;
}
}
if (shift != 7) {
header.write(cache);
}
}
private class OutputStreamWrapper extends OutputStream {
@Override
public void write(final int b) throws IOException {
file.write(b);
compressedCrc32.update(b);
fileBytesWritten++;
}
@Override
public void write(final byte[] b) throws IOException {
OutputStreamWrapper.this.write(b, 0, b.length);
}
@Override
public void write(final byte[] b, final int off, final int len)
throws IOException {
file.write(b, off, len);
compressedCrc32.update(b, off, len);
fileBytesWritten += len;
}
@Override
public void flush() throws IOException {
// no reason to flush a RandomAccessFile
}
@Override
public void close() throws IOException {
// the file will be closed by the containing class's close method
}
}
}
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