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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-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef FILE_IO_H_89578342758342572345
#define FILE_IO_H_89578342758342572345
#include "file_error.h"
#include "serialize.h"
#ifdef ZEN_WIN
#include "win.h" //includes "windows.h"
#endif
namespace zen
{
#ifdef ZEN_WIN
const char LINE_BREAK[] = "\r\n";
#elif defined ZEN_LINUX || defined ZEN_MAC
const char LINE_BREAK[] = "\n"; //since OS X apple uses newline, too
#endif
//OS-buffered file IO optimized for sequential read/write accesses + better error reporting + long path support + following symlinks
#ifdef ZEN_WIN
using FileHandle = HANDLE;
#elif defined ZEN_LINUX || defined ZEN_MAC
using FileHandle = int;
#endif
class FileBase
{
public:
const Zstring& getFilePath() const { return filename_; }
protected:
FileBase(const Zstring& filename) : filename_(filename) {}
private:
FileBase (const FileBase&) = delete;
FileBase& operator=(const FileBase&) = delete;
const Zstring filename_;
};
//-----------------------------------------------------------------------------------------------
class FileInput : public FileBase
{
public:
FileInput(const Zstring& filePath); //throw FileError, ErrorFileLocked
FileInput(FileHandle handle, const Zstring& filePath); //takes ownership!
~FileInput();
//Windows: better use 64kB ?? https://technet.microsoft.com/en-us/library/cc938632
//Linux: use st_blksize?
size_t getBlockSize() const { return 128 * 1024; }
size_t tryRead(void* buffer, size_t bytesToRead); //throw FileError; may return short, only 0 means EOF! => CONTRACT: bytesToRead > 0!
FileHandle getHandle() { return fileHandle; }
private:
FileHandle fileHandle;
};
class FileOutput : public FileBase
{
public:
enum AccessFlag
{
ACC_OVERWRITE,
ACC_CREATE_NEW
};
FileOutput(const Zstring& filePath, AccessFlag access); //throw FileError, ErrorTargetExisting
FileOutput(FileHandle handle, const Zstring& filePath); //takes ownership!
~FileOutput();
FileOutput(FileOutput&& tmp);
size_t getBlockSize() const { return 128 * 1024; }
size_t tryWrite(const void* buffer, size_t bytesToWrite); //throw FileError; may return short! CONTRACT: bytesToWrite > 0
void close(); //throw FileError -> optional, but good place to catch errors when closing stream!
FileHandle getHandle() { return fileHandle; }
private:
FileHandle fileHandle;
};
//native stream I/O convenience functions:
template <class BinContainer> inline
BinContainer loadBinContainer(const Zstring& filePath, //throw FileError
const std::function<void(std::int64_t bytesDelta)>& notifyProgress) //optional
{
FileInput streamIn(filePath); //throw FileError, ErrorFileLocked
return unbufferedLoad<BinContainer>(streamIn, notifyProgress); //throw FileError
}
template <class BinContainer> inline
void saveBinContainer(const Zstring& filePath, const BinContainer& buffer, //throw FileError
const std::function<void(std::int64_t bytesDelta)>& notifyProgress) //optional
{
FileOutput fileOut(filePath, FileOutput::ACC_OVERWRITE); //
unbufferedSave(buffer, fileOut, notifyProgress); //throw FileError
fileOut.close(); //
}
}
#endif //FILE_IO_H_89578342758342572345
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