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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 readPOD (wxInputStream& stream, T& pod);
template <class T> void writePOD(wxOutputStream& stream, const T& pod);
template <class S> S readString (wxInputStream& stream);
template <class S> void readString (wxInputStream& stream, S& str);
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
{
public:
virtual void throwException() const = 0;
protected:
CheckedIo(wxStreamBase& stream) : stream_(stream) {}
void check() const
{
if (stream_.GetLastError() != wxSTREAM_NO_ERROR)
throwException();
}
private:
wxStreamBase& stream_;
};
//wxInputStream proxy throwing exception on error
class CheckedReader : public CheckedIo
{
public:
CheckedReader(wxInputStream& stream) : CheckedIo(stream), stream_(stream) {}
template <class T>
T readPOD() const; //throw!
template <class T>
void readPOD(T& pod) const; //throw!
template <class S>
S readString() const; //throw!
template <class S>
void readString(S& str) const; //throw!
void readArray(void* data, size_t len) const; //throw!
private:
wxInputStream& stream_;
};
//wxOutputStream proxy throwing FileError on error
class CheckedWriter : public CheckedIo
{
public:
CheckedWriter(wxOutputStream& stream) : CheckedIo(stream), stream_(stream) {}
template <class T>
void writePOD(const T& pod) const; //throw!
template <class S>
void writeString(const S& str) const; //throw!
void writeArray(const void* data, size_t len) const; //throw!
private:
wxOutputStream& stream_;
};
//-----------------------implementation-------------------------------
template <class T> inline
T readPOD(wxInputStream& stream)
{
T pod = 0;
readPOD(stream, pod);
return pod;
}
template <class T> inline
void readPOD(wxInputStream& stream, T& pod)
{
stream.Read(reinterpret_cast<char*>(&pod), sizeof(T));
}
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)
{
S str;
readString(stream, str);
return str;
}
template <class S> inline
void readString(wxInputStream& stream, S& str)
{
//don't even consider UTF8 conversions here! "string" is expected to handle arbitrary binary data!
const auto strLength = readPOD<std::uint32_t>(stream);
str.resize(strLength); //throw std::bad_alloc
if (strLength > 0)
stream.Read(&*str.begin(), sizeof(typename S::value_type) * strLength);
}
template <class S> inline
void writeString(wxOutputStream& stream, const S& str)
{
const auto strLength = str.length();
writePOD(stream, static_cast<std::uint32_t>(strLength));
if (strLength > 0)
stream.Write(&*str.begin(), sizeof(typename S::value_type) * strLength); //don't use c_str(), but access uniformly via STL interface
}
inline
void CheckedReader::readArray(void* data, size_t len) const //throw!
{
stream_.Read(data, len);
check();
}
template <class T> inline
T CheckedReader::readPOD() const //checked read operation
{
T pod = 0;
readPOD(pod);
return pod;
}
template <class T> inline
void CheckedReader::readPOD(T& pod) const //checked read operation
{
readArray(&pod, sizeof(T));
}
template <class S> inline
S CheckedReader::readString() const //checked read operation
{
S str;
readString(str);
return str;
}
template <class S> inline
void CheckedReader::readString(S& str) const //checked read operation
{
try
{
zen::readString<S>(stream_, str); //throw std::bad_alloc
}
catch (std::exception&) { throwException(); }
check();
if (stream_.LastRead() != str.length() * sizeof(typename S::value_type)) //some additional check
throwException();
}
inline
void CheckedWriter::writeArray(const void* data, size_t len) const //throw!
{
stream_.Write(data, len);
check();
}
template <class T> inline
void CheckedWriter::writePOD(const T& pod) const //checked write opera
{
writeArray(&pod, sizeof(T));
}
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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