146 lines
3.8 KiB
C++
146 lines
3.8 KiB
C++
/*
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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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#ifndef LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
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#define LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_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 <vector>
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#include <utils/FileMap.h>
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#include <ziparchive/zip_archive.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),
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fd_(fd),
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base_ptr_(nullptr),
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data_length_(0),
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read_pos_(0) {}
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explicit MappedZipFile(void* address, size_t length) :
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has_fd_(false),
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fd_(-1),
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base_ptr_(address),
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data_length_(static_cast<off64_t>(length)),
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read_pos_(0) {}
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bool HasFd() const {return has_fd_;}
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int GetFileDescriptor() const;
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void* GetBasePtr() const;
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off64_t GetFileLength() const;
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bool SeekToOffset(off64_t offset);
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bool ReadData(uint8_t* buffer, size_t read_amount);
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bool ReadAtOffset(uint8_t* buf, size_t len, off64_t off);
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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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void* const base_ptr_;
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const off64_t data_length_;
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// read_pos_ is the offset to the base_ptr_ where we read data from.
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size_t read_pos_;
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};
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class CentralDirectory {
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public:
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CentralDirectory(void) :
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base_ptr_(nullptr),
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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(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::FileMap> directory_map;
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// number of entries in the Zip archive
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uint16_t num_entries;
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// We know how many entries are in the Zip archive, so we can have a
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// fixed-size hash table. We define a load factor of 0.75 and over
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// allocate so the maximum number entries can never be higher than
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// ((4 * UINT16_MAX) / 3 + 1) which can safely fit into a uint32_t.
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uint32_t hash_table_size;
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ZipString* hash_table;
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ZipArchive(const int fd, bool assume_ownership) :
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mapped_zip(fd),
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close_file(assume_ownership),
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directory_offset(0),
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central_directory(),
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directory_map(new android::FileMap()),
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num_entries(0),
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hash_table_size(0),
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hash_table(nullptr) {}
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ZipArchive(void* address, size_t length) :
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mapped_zip(address, length),
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close_file(false),
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directory_offset(0),
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central_directory(),
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directory_map(new android::FileMap()),
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num_entries(0),
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hash_table_size(0),
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hash_table(nullptr) {}
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~ZipArchive() {
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if (close_file && mapped_zip.GetFileDescriptor() >= 0) {
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close(mapped_zip.GetFileDescriptor());
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}
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free(hash_table);
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}
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bool InitializeCentralDirectory(const char* debug_file_name, off64_t cd_start_offset,
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size_t cd_size);
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};
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#endif // LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
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