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81 lines
2.6 KiB
81 lines
2.6 KiB
4 months ago
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/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <memory>
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#include <string>
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#include <vector>
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#include <adb_unique_fd.h>
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#include "fastdeploy/proto/ApkEntry.pb.h"
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class ApkArchiveTester;
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// Manipulates an APK archive. Process it by mmaping it in order to minimize
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// I/Os.
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class ApkArchive {
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public:
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friend ApkArchiveTester;
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// A convenience struct to store the result of search operation when
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// locating the EoCDr, CDr, and Signature Block.
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struct Location {
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off_t offset = 0;
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off_t size = 0;
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bool valid = false;
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};
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ApkArchive(const std::string& path);
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~ApkArchive();
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com::android::fastdeploy::APKDump ExtractMetadata();
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// Parses the CDr starting from |input| and returns number of bytes consumed.
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// Extracts local file header offset, data size and calculates MD5 hash of the record.
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// 0 indicates invalid CDr.
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static size_t ParseCentralDirectoryRecord(const char* input, size_t size, std::string* md5Hash,
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int64_t* localFileHeaderOffset, int64_t* dataSize);
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// Calculates Local File Entry size including header using offset and data size from CDr.
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// 0 indicates invalid Local File Entry.
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size_t CalculateLocalFileEntrySize(int64_t localFileHeaderOffset, int64_t dataSize) const;
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private:
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std::string ReadMetadata(Location loc) const;
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// Retrieve the location of the Central Directory Record.
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Location GetCDLocation();
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// Retrieve the location of the signature block starting from Central
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// Directory Record
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Location GetSignatureLocation(off_t cdRecordOffset);
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// Find the End of Central Directory Record, starting from the end of the
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// file.
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off_t FindEndOfCDRecord() const;
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// Find Central Directory Record, starting from the end of the file.
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Location FindCDRecord(const char* cursor);
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// Checks if the archive can be used.
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bool ready() const { return fd_ >= 0; }
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std::string path_;
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off_t size_;
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unique_fd fd_;
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};
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