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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <memory>
#include <string>
#include <vector>
#include <adb_unique_fd.h>
#include "fastdeploy/proto/ApkEntry.pb.h"
class ApkArchiveTester;
// Manipulates an APK archive. Process it by mmaping it in order to minimize
// I/Os.
class ApkArchive {
public:
friend ApkArchiveTester;
// A convenience struct to store the result of search operation when
// locating the EoCDr, CDr, and Signature Block.
struct Location {
off_t offset = 0;
off_t size = 0;
bool valid = false;
};
ApkArchive(const std::string& path);
~ApkArchive();
com::android::fastdeploy::APKDump ExtractMetadata();
// Parses the CDr starting from |input| and returns number of bytes consumed.
// Extracts local file header offset, data size and calculates MD5 hash of the record.
// 0 indicates invalid CDr.
static size_t ParseCentralDirectoryRecord(const char* input, size_t size, std::string* md5Hash,
int64_t* localFileHeaderOffset, int64_t* dataSize);
// Calculates Local File Entry size including header using offset and data size from CDr.
// 0 indicates invalid Local File Entry.
size_t CalculateLocalFileEntrySize(int64_t localFileHeaderOffset, int64_t dataSize) const;
private:
std::string ReadMetadata(Location loc) const;
// Retrieve the location of the Central Directory Record.
Location GetCDLocation();
// Retrieve the location of the signature block starting from Central
// Directory Record
Location GetSignatureLocation(off_t cdRecordOffset);
// Find the End of Central Directory Record, starting from the end of the
// file.
off_t FindEndOfCDRecord() const;
// Find Central Directory Record, starting from the end of the file.
Location FindCDRecord(const char* cursor);
// Checks if the archive can be used.
bool ready() const { return fd_ >= 0; }
std::string path_;
off_t size_;
unique_fd fd_;
};
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