File.cc

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#include "File.hh"
#include "Filename.hh"
#include "LocalFile.hh"
#include "GZFileAdapter.hh"
#include "ZipFileAdapter.hh"
#include "checked_cast.hh"
#include "ranges.hh"
#include <array>
#include <memory>
 
namespace openmsx {
 
File::File() = default;
 
[[nodiscard]] static std::unique_ptr<FileBase> init(std::string filename, File::OpenMode mode)
{
        static constexpr std::array<uint8_t, 3> GZ_HEADER  = {0x1F, 0x8B, 0x08};
        static constexpr std::array<uint8_t, 4> ZIP_HEADER = {0x50, 0x4B, 0x03, 0x04};
 
        std::unique_ptr<FileBase> file = std::make_unique<LocalFile>(std::move(filename), mode);
        if (file->getSize() >= 4) {
                std::array<uint8_t, 4> buf;
                file->read(buf);
                file->seek(0);
                if (ranges::equal(subspan<3>(buf), GZ_HEADER)) {
                        file = std::make_unique<GZFileAdapter>(std::move(file));
                } else if (ranges::equal(subspan<4>(buf), ZIP_HEADER)) {
                        file = std::make_unique<ZipFileAdapter>(std::move(file));
                } else {
                        // only pre-cache non-compressed files
                        if (mode == File::PRE_CACHE) {
                                checked_cast<LocalFile*>(file.get())->preCacheFile();
                        }
                }
        }
        return file;
}
 
File::File(std::string filename, OpenMode mode)
        : file(init(std::move(filename), mode))
{
}
 
File::File(const Filename& filename, OpenMode mode)
        : File(filename.getResolved(), mode)
{
}
 
File::File(Filename&& filename, OpenMode mode)
        : File(std::move(filename).getResolved(), mode)
{
}
 
File::File(std::string filename, const char* mode)
        : file(std::make_unique<LocalFile>(std::move(filename), mode))
{
}
 
File::File(const Filename& filename, const char* mode)
        : File(filename.getResolved(), mode)
{
}
 
File::File(Filename&& filename, const char* mode)
        : File(std::move(filename).getResolved(), mode)
{
}
 
File::File(File&& other) noexcept
        : file(std::move(other.file))
{
}
 
File::File(std::unique_ptr<FileBase> file_)
        : file(std::move(file_))
{
}
 
File::~File() = default;
 
File& File::operator=(File&& other) noexcept
{
        file = std::move(other.file);
        return *this;
}
 
void File::close()
{
        file.reset();
}
 
void File::read(std::span<uint8_t> buffer)
{
        file->read(buffer);
}
 
void File::write(std::span<const uint8_t> buffer)
{
        file->write(buffer);
}
 
std::span<const uint8_t> File::mmap()
{
        return file->mmap();
}
 
void File::munmap()
{
        file->munmap();
}
 
size_t File::getSize()
{
        return file->getSize();
}
 
void File::seek(size_t pos)
{
        file->seek(pos);
}
 
size_t File::getPos()
{
        return file->getPos();
}
 
void File::truncate(size_t size)
{
        return file->truncate(size);
}
 
void File::flush()
{
        file->flush();
}
 
const std::string& File::getURL() const
{
        return file->getURL();
}
 
std::string File::getLocalReference() const
{
        return file->getLocalReference();
}
 
std::string_view File::getOriginalName()
{
        std::string_view orig = file->getOriginalName();
        return !orig.empty() ? orig : getURL();
}
 
bool File::isReadOnly() const
{
        return file->isReadOnly();
}
 
time_t File::getModificationDate()
{
        return file->getModificationDate();
}
 
} // namespace openmsx