Portable Memory-Mapped File library
libpmmf - Portable Memory-Mapped File library for C++
Build:
Build pmmf library for Linux (required GCC, CMake, Make):
git clone git@github.com:gbytegear/libpmmf.git
cd ./libpmmf/build
cmake . -G "Unix Makefiles" . -DCMAKE_BUILD_TYPE=Release
make pmmfResult - libpmmf/build/libpmmf.a
Build pmmf library for Windows (required MSys2 step 1-5, MinGW step 6-7, CMake, Make):
git clone git@github.com:gbytegear/libpmmf.git
cd ./libpmmf/build
cmake . -G "MSYS Makefiles" . -DCMAKE_BUILD_TYPE=Release
make pmmfResult - libpmmf/build/libpmmf.a
Usage:
Link with your project:
g++ <your_project_source_file> -L<path_to_libpmmf.a> -I<path_to_libpmmf/include> -lpmmfSimple programm example:
#include "include/mmf.hxx"
#include <iostream>
#pragma pack(push, 1)
struct Data {
char cstr[50];
};
#pragma pack(pop)
auto main(int argc, char* argv[]) -> int {
using namespace pmmf;
if (argc < 2) {
std::cerr << "Required 1 file paths!" << std::endl;
return -1;
}
MappedFile mapped_file(argv[1], ProtectionMode::rw, MapFlag::shared);
if(!mapped_file.isFileOpen()) {
std::cerr << "Can't open \"" << argv[1] << "\" file" << std::endl;
return -1;
}
std::cout << "File \"" << argv[1] << "\" is open" << std::endl
<< "| File size: " << mapped_file.getFileSize() << " bytes" << std::endl;
MappedData<Data> second_mapped_array = mapped_file.getMappedData<Data>(sizeof(Data), 2);
if(!second_mapped_array.isMapped()) {
std::cerr << "Can't map second area of \"" << argv[1] << "\" file" << std::endl;
return -1;
}
std::cout << "Second area of \"" << argv[1] << "\" file is mapped" << std::endl;
MappedData<Data> first_mapped_array = mapped_file.getMappedData<Data>(0);
if(!second_mapped_array.isMapped()) {
std::cerr << "Can't map first area of \"" << argv[1] << "\" file" << std::endl;
return -1;
}
std::cout << "First area of \"" << argv[1] << "\" file is mapped" << std::endl;
Data& page_1_data_1 = *first_mapped_array;
Data& page_2_data_1 = *second_mapped_array;
Data& page_2_data_2 = second_mapped_array[1];
new(&page_1_data_1) Data{"Lorem ipsum dolor sit amet, consectetur efficitur"};
if(!first_mapped_array.flush()) {
std::cerr << "Can't flush first area of \"" << argv[1] << "\" file" << std::endl;
return -1;
}
std::cout << "First area of \"" << argv[1] << "\" file is flushed" << std::endl
<< "| Recorded data: " << first_mapped_array->cstr << std::endl;
new(&page_2_data_1) Data{"Lorem ipsum dolor sit amet, consectetur tincidunt"};
new(&page_2_data_2) Data{"Lorem ipsum dolor sit amet, consectetur porttitor"};
if(!second_mapped_array.flush()) {
std::cerr << "Can't flush second area of \"" << argv[1] << "\" file" << std::endl;
return -1;
}
std::cout << "Second area of \"" << argv[1] << "\" file is flushed" << std::endl;
for(auto& data : second_mapped_array)
std::cout << "| Recorded data: " << data.cstr << std::endl;
std::cout << "File size: " << mapped_file.getFileSize() << " bytes" << std::endl;
return 0;
}