nativefilestream.h

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#ifndef IOUTILITIES_NATIVE_FILE_STREAM
#define IOUTILITIES_NATIVE_FILE_STREAM
 
#include "../global.h"
 
#ifdef CPP_UTILITIES_USE_NATIVE_FILE_BUFFER
#include <iostream>
#include <memory>
#include <streambuf>
#include <string>
#ifdef PLATFORM_WINDOWS
#include <string_view>
#endif
#else
#include <fstream>
#endif
 
namespace CppUtilities {
 
#ifdef CPP_UTILITIES_USE_NATIVE_FILE_BUFFER
 
class CPP_UTILITIES_EXPORT NativeFileStream : public std::iostream {
public:
#ifdef PLATFORM_WINDOWS
    using Handle = void *;
#endif
    struct CPP_UTILITIES_EXPORT FileBuffer {
        FileBuffer(std::basic_streambuf<char> *buffer);
        FileBuffer(const char *path, ios_base::openmode openMode);
        FileBuffer(const std::string &path, ios_base::openmode openMode);
        FileBuffer(int fileDescriptor, ios_base::openmode openMode);
 
        std::unique_ptr<std::basic_streambuf<char>> buffer;
#ifdef PLATFORM_WINDOWS
        Handle handle = nullptr;
#endif
        int descriptor = -1;
    };
 
    NativeFileStream();
    NativeFileStream(const char *path, std::ios_base::openmode openMode);
    NativeFileStream(const std::string &path, std::ios_base::openmode openMode);
    NativeFileStream(int fileDescriptor, std::ios_base::openmode openMode);
    NativeFileStream(NativeFileStream &&);
    ~NativeFileStream() override;
 
    bool is_open() const;
    bool isOpen() const;
    void open(const char *path, std::ios_base::openmode openMode);
    void open(const std::string &path, std::ios_base::openmode openMode);
    void open(int fileDescriptor, std::ios_base::openmode openMode);
    void close();
    int fileDescriptor();
#ifdef PLATFORM_WINDOWS
    Handle fileHandle();
    static std::unique_ptr<wchar_t[]> makeWidePath(std::string_view path);
    static std::unique_ptr<wchar_t[]> makeWidePath(const char *path);
    static std::unique_ptr<wchar_t[]> makeWidePath(const std::string &path);
#endif
 
private:
    void setData(FileBuffer data, std::ios_base::openmode openMode);
 
    FileBuffer m_data;
    std::ios_base::openmode m_openMode;
};

inline NativeFileStream::NativeFileStream(const char *path, ios_base::openmode openMode)
    : NativeFileStream()
{
    open(path, openMode);
}

inline NativeFileStream::NativeFileStream(const std::string &path, ios_base::openmode openMode)
    : NativeFileStream(path.data(), openMode)
{
}

inline NativeFileStream::NativeFileStream(int fileDescriptor, ios_base::openmode openMode)
    : NativeFileStream()
{
    open(fileDescriptor, openMode);
}

inline int NativeFileStream::fileDescriptor()
{
    return m_data.descriptor;
}
 
#ifdef PLATFORM_WINDOWS
inline NativeFileStream::Handle NativeFileStream::fileHandle()
{
    return m_data.handle;
}

inline std::unique_ptr<wchar_t[]> NativeFileStream::makeWidePath(const char *path)
{
    return makeWidePath(std::string_view(path));
}
#endif

inline bool NativeFileStream::is_open() const
{
    return isOpen();
}
 
#else // CPP_UTILITIES_USE_NATIVE_FILE_BUFFER
 
using NativeFileStream = std::fstream;
 
#endif
 
} // namespace CppUtilities
 
#endif // IOUTILITIES_NATIVE_FILE_STREAM