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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 org.apache.commons.compress.archivers.sevenz;
import java.util.Arrays;
/**
* The (partially) supported compression/encryption methods used in 7z archives.
*
* <p>All methods with a _FILTER suffix are used as preprocessors with
* the goal of creating a better compression ratio with the compressor
* that comes next in the chain of methods. 7z will in general only
* allow them to be used together with a "real" compression method but
* Commons Compress doesn't enforce this.</p>
*
* <p>The BCJ_ filters work on executable files for the given platform
* and convert relative addresses to absolute addresses in CALL
* instructions. This means they are only useful when applied to
* executables of the chosen platform.</p>
*/
public enum SevenZMethod {
/** no compression at all */
COPY(new byte[] { (byte)0x00 }),
/** LZMA - only supported when reading */
LZMA(new byte[] { (byte)0x03, (byte)0x01, (byte)0x01 }),
/** LZMA2 */
LZMA2(new byte[] { (byte)0x21 }),
/** Deflate */
DEFLATE(new byte[] { (byte)0x04, (byte)0x01, (byte)0x08 }),
/**
* Deflate64
* @since 1.16
*/
DEFLATE64(new byte[] { (byte)0x04, (byte)0x01, (byte)0x09 }),
/** BZIP2 */
BZIP2(new byte[] { (byte)0x04, (byte)0x02, (byte)0x02 }),
/**
* AES encryption with a key length of 256 bit using SHA256 for
* hashes - only supported when reading
*/
AES256SHA256(new byte[] { (byte)0x06, (byte)0xf1, (byte)0x07, (byte)0x01 }),
/**
* BCJ x86 platform version 1.
* @since 1.8
*/
BCJ_X86_FILTER(new byte[] { 0x03, 0x03, 0x01, 0x03 }),
/**
* BCJ PowerPC platform.
* @since 1.8
*/
BCJ_PPC_FILTER(new byte[] { 0x03, 0x03, 0x02, 0x05 }),
/**
* BCJ I64 platform.
* @since 1.8
*/
BCJ_IA64_FILTER(new byte[] { 0x03, 0x03, 0x04, 0x01 }),
/**
* BCJ ARM platform.
* @since 1.8
*/
BCJ_ARM_FILTER(new byte[] { 0x03, 0x03, 0x05, 0x01 }),
/**
* BCJ ARM Thumb platform.
* @since 1.8
*/
BCJ_ARM_THUMB_FILTER(new byte[] { 0x03, 0x03, 0x07, 0x01 }),
/**
* BCJ Sparc platform.
* @since 1.8
*/
BCJ_SPARC_FILTER(new byte[] { 0x03, 0x03, 0x08, 0x05 }),
/**
* Delta filter.
* @since 1.8
*/
DELTA_FILTER(new byte[] { 0x03 });
private final byte[] id;
SevenZMethod(final byte[] id) {
this.id = id;
}
byte[] getId() {
final byte[] copy = new byte[id.length];
System.arraycopy(id, 0, copy, 0, id.length);
return copy;
}
static SevenZMethod byId(final byte[] id) {
for (final SevenZMethod m : SevenZMethod.class.getEnumConstants()) {
if (Arrays.equals(m.id, id)) {
return m;
}
}
return null;
}
}
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