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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef SERIALIZE_H_INCLUDED
#define SERIALIZE_H_INCLUDED
#include <cstdint>
#include <wx/stream.h>
#include <zen/file_io.h>
namespace zen
{
//unchecked, unformatted serialization
template <class T> T readPOD (wxInputStream& stream);
template <class T> void writePOD(wxOutputStream& stream, const T& pod);
template <class S> S readString (wxInputStream& stream);
template <class S> void writeString(wxOutputStream& stream, const S& str);
//############# wxWidgets stream adapter #############
class FileInputStream : public wxInputStream
{
public:
FileInputStream(const Zstring& filename) : fileObj(filename) {} //throw FileError
private:
virtual size_t OnSysRead(void* buffer, size_t bufsize) { return fileObj.read(buffer, bufsize); } //throw FileError
zen::FileInput fileObj;
};
class FileOutputStream : public wxOutputStream
{
public:
FileOutputStream(const Zstring& filename) : fileObj(filename, zen::FileOutput::ACC_OVERWRITE) {} //throw FileError
private:
virtual size_t OnSysWrite(const void* buffer, size_t bufsize)
{
fileObj.write(buffer, bufsize); //throw FileError
return bufsize;
}
zen::FileOutput fileObj;
};
class CheckedIo
{
protected:
CheckedIo(wxStreamBase& stream) : stream_(stream) {}
void check() const
{
if (stream_.GetLastError() != wxSTREAM_NO_ERROR)
throwException();
}
virtual void throwException() const = 0;
private:
wxStreamBase& stream_;
};
//wxInputStream proxy throwing exception on error
class CheckedReader : private CheckedIo
{
public:
CheckedReader(wxInputStream& stream) : CheckedIo(stream), stream_(stream) {}
template <class T>
T readPOD() const; //throw!
template <class S>
S readString() const; //throw!
private:
wxInputStream& stream_;
};
//wxOutputStream proxy throwing FileError on error
class CheckedWriter : private CheckedIo
{
public:
CheckedWriter(wxOutputStream& stream) : CheckedIo(stream), stream_(stream) {}
template <class T>
void writePOD(T number) const; //throw!
template <class S>
void writeString(const S& str) const; //throw!
private:
wxOutputStream& stream_;
};
//-----------------------implementation-------------------------------
template <class T> inline
T readPOD(wxInputStream& stream)
{
T pod = 0;
stream.Read(reinterpret_cast<char*>(&pod), sizeof(T));
return pod;
}
template <class T> inline
void writePOD(wxOutputStream& stream, const T& pod)
{
stream.Write(reinterpret_cast<const char*>(&pod), sizeof(T));
}
template <class S> inline
S readString(wxInputStream& stream)
{
//don't even consider UTF8 conversions here! "string" is expected to handle arbitrary binary data!
typedef typename S::value_type CharType;
const auto strLength = readPOD<std::uint32_t>(stream);
S output;
if (strLength > 0)
{
output.resize(strLength); //throw std::bad_alloc
stream.Read(&*output.begin(), sizeof(CharType) * strLength);
}
return output;
}
template <class S> inline
void writeString(wxOutputStream& stream, const S& str)
{
writePOD(stream, static_cast<std::uint32_t>(str.length()));
stream.Write(str.c_str(), sizeof(typename S::value_type) * str.length());
}
template <class T>
inline
T CheckedReader::readPOD() const //checked read operation
{
T output = zen::readPOD<T>(stream_);
check();
return output;
}
template <class S> inline
S CheckedReader::readString() const //checked read operation
{
S output;
try
{
output = zen::readString<S>(stream_); //throw std::bad_alloc
}
catch (std::exception&) { throwException(); }
check();
if (stream_.LastRead() != output.length() * sizeof(typename S::value_type)) //some additional check
throwException();
return output;
}
template <class T> inline
void CheckedWriter::writePOD(T number) const //checked write operation
{
zen::writePOD<T>(stream_, number);
check();
}
template <class S> inline
void CheckedWriter::writeString(const S& str) const //checked write operation
{
zen::writeString(stream_, str);
check();
if (stream_.LastWrite() != str.length() * sizeof(typename S::value_type)) //some additional check
throwException();
}
}
#endif //SERIALIZE_H_INCLUDED
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