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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed 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.android.apkzlib.zip;
import javax.annotation.Nonnull;
/**
* Information stored in the {@link CentralDirectoryHeader} that is related to compression and may
* need to be computed lazily.
*/
public class CentralDirectoryHeaderCompressInfo {
/**
* Version of zip file that only supports stored files.
*/
public static final long VERSION_WITH_STORE_FILES_ONLY = 10L;
/**
* Version of zip file that only supports directories and deflated files.
*/
public static final long VERSION_WITH_DIRECTORIES_AND_DEFLATE = 20L;
/**
* The compression method.
*/
@Nonnull
private final CompressionMethod mMethod;
/**
* Size of the file compressed. 0 if the file has no data.
*/
private final long compressedSize;
/**
* Version needed to extract the zip.
*/
private final long versionExtract;
/**
* Creates new compression information for the central directory header.
*
* @param method the compression method
* @param compressedSize the compressed size
* @param versionToExtract minimum version to extract (typically
* {@link #VERSION_WITH_STORE_FILES_ONLY} or {@link #VERSION_WITH_DIRECTORIES_AND_DEFLATE})
*/
public CentralDirectoryHeaderCompressInfo(
@Nonnull CompressionMethod method,
long compressedSize,
long versionToExtract) {
mMethod = method;
this.compressedSize = compressedSize;
versionExtract = versionToExtract;
}
/**
* Creates new compression information for the central directory header.
*
* @param header the header this information relates to
* @param method the compression method
* @param compressedSize the compressed size
*/
public CentralDirectoryHeaderCompressInfo(@Nonnull CentralDirectoryHeader header,
@Nonnull CompressionMethod method, long compressedSize) {
mMethod = method;
this.compressedSize = compressedSize;
if (header.getName().endsWith("/") || method == CompressionMethod.DEFLATE) {
/*
* Directories and compressed files only in version 2.0.
*/
versionExtract = VERSION_WITH_DIRECTORIES_AND_DEFLATE;
} else {
versionExtract = VERSION_WITH_STORE_FILES_ONLY;
}
}
/**
* Obtains the compression data size.
*
* @return the compressed data size
*/
public long getCompressedSize() {
return compressedSize;
}
/**
* Obtains the compression method.
*
* @return the compression method
*/
@Nonnull
public CompressionMethod getMethod() {
return mMethod;
}
/**
* Obtains the minimum version for extract.
*
* @return the minimum version
*/
public long getVersionExtract() {
return versionExtract;
}
}
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