LocalFileReference.cc

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#include "LocalFileReference.hh"
#include "File.hh"
#include "Filename.hh"
#include "FileOperations.hh"
#include "FileException.hh"
#include "build-info.hh"
#include <cstdio>
#include <cassert>
 
namespace openmsx {
 
LocalFileReference::LocalFileReference(File& file)
{
        init(file);
}
 
LocalFileReference::LocalFileReference(std::string filename)
{
        File file(std::move(filename));
        init(file);
}
 
LocalFileReference::LocalFileReference(const Filename& filename)
        : LocalFileReference(filename.getResolved())
{
}
 
LocalFileReference::LocalFileReference(Filename&& filename)
        : LocalFileReference(std::move(filename).getResolved())
{
}
 
LocalFileReference::LocalFileReference(LocalFileReference&& other) noexcept
        : tmpFile(std::move(other.tmpFile))
        , tmpDir (std::move(other.tmpDir ))
{
        other.tmpDir.clear();
}
 
LocalFileReference& LocalFileReference::operator=(LocalFileReference&& other) noexcept
{
        cleanup();
        tmpFile = std::move(other.tmpFile);
        tmpDir  = std::move(other.tmpDir);
        other.tmpDir.clear();
        return *this;
}
 
LocalFileReference::~LocalFileReference()
{
        cleanup();
}
 
void LocalFileReference::init(File& file)
{
        tmpFile = file.getLocalReference();
        if (!tmpFile.empty()) {
                // file is backed on the (local) filesystem,
                // we can simply use the path to that file
                assert(tmpDir.empty()); // no need to delete file/dir later
                return;
        }
 
        // create temp dir
#if defined(_WIN32) || PLATFORM_ANDROID
        tmpDir = FileOperations::getTempDir() + FileOperations::nativePathSeparator + "openmsx";
#else
        // TODO - why not just use getTempDir()?
        tmpDir = strCat("/tmp/openmsx.", int(getpid()));
#endif
        // it's possible this directory already exists, in that case the
        // following function does nothing
        FileOperations::mkdirp(tmpDir);
 
        // create temp file
        auto fp = FileOperations::openUniqueFile(tmpDir, tmpFile);
        if (!fp) {
                throw FileException("Couldn't create temp file");
        }
 
        // write temp file
        auto mmap = file.mmap();
        if (fwrite(mmap.data(), 1, mmap.size(), fp.get()) != mmap.size()) {
                throw FileException("Couldn't write temp file");
        }
}
 
void LocalFileReference::cleanup()
{
        if (!tmpDir.empty()) {
                FileOperations::unlink(tmpFile);
                // it's possible the directory is not empty, in that case
                // the following function will fail, we ignore that error
                FileOperations::rmdir(tmpDir);
        }
}
 
const std::string& LocalFileReference::getFilename() const
{
        assert(!tmpFile.empty());
        return tmpFile;
}
 
} // namespace openmsx