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123 lines
3.4 KiB
123 lines
3.4 KiB
/*
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* Copyright (C) 2008 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 <ziparchive/zip_archive.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "android-base/macros.h"
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#include "android-base/mapped_file.h"
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#include "android-base/memory.h"
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#include "zip_cd_entry_map.h"
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#include "zip_error.h"
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class MappedZipFile {
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public:
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explicit MappedZipFile(const int fd)
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: has_fd_(true), fd_(fd), fd_offset_(0), base_ptr_(nullptr), data_length_(-1) {}
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explicit MappedZipFile(const int fd, off64_t length, off64_t offset)
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: has_fd_(true), fd_(fd), fd_offset_(offset), base_ptr_(nullptr), data_length_(length) {}
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explicit MappedZipFile(const void* address, size_t length)
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: has_fd_(false), fd_(-1), fd_offset_(0), base_ptr_(address),
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data_length_(static_cast<off64_t>(length)) {}
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bool HasFd() const { return has_fd_; }
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int GetFileDescriptor() const;
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const void* GetBasePtr() const;
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off64_t GetFileOffset() const;
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off64_t GetFileLength() const;
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bool ReadAtOffset(uint8_t* buf, size_t len, off64_t off) const;
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private:
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// If has_fd_ is true, fd is valid and we'll read contents of a zip archive
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// from the file. Otherwise, we're opening the archive from a memory mapped
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// file. In that case, base_ptr_ points to the start of the memory region and
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// data_length_ defines the file length.
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const bool has_fd_;
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const int fd_;
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const off64_t fd_offset_;
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const void* const base_ptr_;
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mutable off64_t data_length_;
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};
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class CentralDirectory {
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public:
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CentralDirectory(void) : base_ptr_(nullptr), length_(0) {}
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const uint8_t* GetBasePtr() const { return base_ptr_; }
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size_t GetMapLength() const { return length_; }
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void Initialize(const void* map_base_ptr, off64_t cd_start_offset, size_t cd_size);
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private:
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const uint8_t* base_ptr_;
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size_t length_;
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};
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struct ZipArchive {
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// open Zip archive
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mutable MappedZipFile mapped_zip;
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const bool close_file;
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// mapped central directory area
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off64_t directory_offset;
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CentralDirectory central_directory;
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std::unique_ptr<android::base::MappedFile> directory_map;
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// number of entries in the Zip archive
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uint64_t num_entries;
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std::unique_ptr<CdEntryMapInterface> cd_entry_map;
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ZipArchive(MappedZipFile&& map, bool assume_ownership);
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ZipArchive(const void* address, size_t length);
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~ZipArchive();
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bool InitializeCentralDirectory(off64_t cd_start_offset, size_t cd_size);
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};
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// Reads the unaligned data of type |T| and auto increment the offset.
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template <typename T>
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static T ConsumeUnaligned(uint8_t** address) {
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auto ret = android::base::get_unaligned<T>(*address);
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*address += sizeof(T);
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return ret;
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}
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// Writes the unaligned data of type |T| and auto increment the offset.
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template <typename T>
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void EmitUnaligned(uint8_t** address, T data) {
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android::base::put_unaligned<T>(*address, data);
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*address += sizeof(T);
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}
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