org.apache.commons.compress.archivers.sevenz.Coders 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.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
import org.apache.commons.compress.utils.FlushShieldFilterOutputStream;
import org.tukaani.xz.ARMOptions;
import org.tukaani.xz.ARMThumbOptions;
import org.tukaani.xz.FilterOptions;
import org.tukaani.xz.FinishableWrapperOutputStream;
import org.tukaani.xz.IA64Options;
import org.tukaani.xz.PowerPCOptions;
import org.tukaani.xz.SPARCOptions;
import org.tukaani.xz.X86Options;
class Coders {
private static final Map CODER_MAP = new HashMap() {
private static final long serialVersionUID = 1664829131806520867L;
{
put(SevenZMethod.COPY, new CopyDecoder());
put(SevenZMethod.LZMA, new LZMADecoder());
put(SevenZMethod.LZMA2, new LZMA2Decoder());
put(SevenZMethod.DEFLATE, new DeflateDecoder());
put(SevenZMethod.BZIP2, new BZIP2Decoder());
put(SevenZMethod.AES256SHA256, new AES256SHA256Decoder());
put(SevenZMethod.BCJ_X86_FILTER, new BCJDecoder(new X86Options()));
put(SevenZMethod.BCJ_PPC_FILTER, new BCJDecoder(new PowerPCOptions()));
put(SevenZMethod.BCJ_IA64_FILTER, new BCJDecoder(new IA64Options()));
put(SevenZMethod.BCJ_ARM_FILTER, new BCJDecoder(new ARMOptions()));
put(SevenZMethod.BCJ_ARM_THUMB_FILTER, new BCJDecoder(new ARMThumbOptions()));
put(SevenZMethod.BCJ_SPARC_FILTER, new BCJDecoder(new SPARCOptions()));
put(SevenZMethod.DELTA_FILTER, new DeltaDecoder());
}};
static CoderBase findByMethod(final SevenZMethod method) {
return CODER_MAP.get(method);
}
static InputStream addDecoder(final String archiveName, final InputStream is, final long uncompressedLength,
final Coder coder, final byte[] password) throws IOException {
final CoderBase cb = findByMethod(SevenZMethod.byId(coder.decompressionMethodId));
if (cb == null) {
throw new IOException("Unsupported compression method " +
Arrays.toString(coder.decompressionMethodId)
+ " used in " + archiveName);
}
return cb.decode(archiveName, is, uncompressedLength, coder, password);
}
static OutputStream addEncoder(final OutputStream out, final SevenZMethod method,
final Object options) throws IOException {
final CoderBase cb = findByMethod(method);
if (cb == null) {
throw new IOException("Unsupported compression method " + method);
}
return cb.encode(out, options);
}
static class CopyDecoder extends CoderBase {
@Override
InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength,
final Coder coder, final byte[] password) throws IOException {
return in;
}
@Override
OutputStream encode(final OutputStream out, final Object options) {
return out;
}
}
static class BCJDecoder extends CoderBase {
private final FilterOptions opts;
BCJDecoder(final FilterOptions opts) {
this.opts = opts;
}
@Override
InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength,
final Coder coder, final byte[] password) throws IOException {
try {
return opts.getInputStream(in);
} catch (final AssertionError e) {
throw new IOException("BCJ filter used in " + archiveName
+ " needs XZ for Java > 1.4 - see "
+ "http://commons.apache.org/proper/commons-compress/limitations.html#7Z",
e);
}
}
@SuppressWarnings("resource")
@Override
OutputStream encode(final OutputStream out, final Object options) {
return new FlushShieldFilterOutputStream(opts.getOutputStream(new FinishableWrapperOutputStream(out)));
}
}
static class DeflateDecoder extends CoderBase {
DeflateDecoder() {
super(Number.class);
}
@Override
InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength,
final Coder coder, final byte[] password)
throws IOException {
final Inflater inflater = new Inflater(true);
final InflaterInputStream inflaterInputStream = new InflaterInputStream(new DummyByteAddingInputStream(in),
inflater);
return new InputStream() {
@Override
public int read() throws IOException {
return inflaterInputStream.read();
}
@Override
public int read(final byte[] b, final int off, final int len) throws IOException {
return inflaterInputStream.read(b, off, len);
}
@Override
public int read(final byte[] b) throws IOException {
return inflaterInputStream.read(b);
}
@Override
public void close() throws IOException {
try {
inflaterInputStream.close();
} finally {
inflater.end();
}
}
};
}
@Override
OutputStream encode(final OutputStream out, final Object options) {
final int level = numberOptionOrDefault(options, 9);
final Deflater deflater = new Deflater(level, true);
final DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(out, deflater);
return new OutputStream() {
@Override
public void write(final int b) throws IOException {
deflaterOutputStream.write(b);
}
@Override
public void write(final byte[] b) throws IOException {
deflaterOutputStream.write(b);
}
@Override
public void write(final byte[] b, final int off, final int len) throws IOException {
deflaterOutputStream.write(b, off, len);
}
@Override
public void close() throws IOException {
try {
deflaterOutputStream.close();
} finally {
deflater.end();
}
}
};
}
}
static class BZIP2Decoder extends CoderBase {
BZIP2Decoder() {
super(Number.class);
}
@Override
InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength,
final Coder coder, final byte[] password)
throws IOException {
return new BZip2CompressorInputStream(in);
}
@Override
OutputStream encode(final OutputStream out, final Object options)
throws IOException {
final int blockSize = numberOptionOrDefault(options, BZip2CompressorOutputStream.MAX_BLOCKSIZE);
return new BZip2CompressorOutputStream(out, blockSize);
}
}
/**
* ZLIB requires an extra dummy byte.
*
* @see java.util.zip.Inflater#Inflater(boolean)
* @see org.apache.commons.compress.archivers.zip.ZipFile.BoundedInputStream
*/
private static class DummyByteAddingInputStream extends FilterInputStream {
private boolean addDummyByte = true;
private DummyByteAddingInputStream(final InputStream in) {
super(in);
}
@Override
public int read() throws IOException {
int result = super.read();
if (result == -1 && addDummyByte) {
addDummyByte = false;
result = 0;
}
return result;
}
@Override
public int read(final byte[] b, final int off, final int len) throws IOException {
final int result = super.read(b, off, len);
if (result == -1 && addDummyByte) {
addDummyByte = false;
b[off] = 0;
return 1;
}
return result;
}
}
}
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