/* Copyright (C) 2009 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see .
*/
#ifndef INCLUDED_WRITE_BUFFER
#define INCLUDED_WRITE_BUFFER
#include "lib/file/file.h"
class WriteBuffer
{
public:
WriteBuffer();
void Append(const void* data, size_t size);
void Overwrite(const void* data, size_t size, size_t offset);
shared_ptr Data() const
{
return m_data;
}
size_t Size() const
{
return m_size;
}
private:
size_t m_capacity; // must come first (init order)
shared_ptr m_data;
size_t m_size;
};
class UnalignedWriter
{
NONCOPYABLE(UnalignedWriter);
public:
UnalignedWriter(const PFile& file, off_t ofs);
~UnalignedWriter();
/**
* add data to the align buffer, writing it out to disk if full.
**/
LibError Append(const u8* data, size_t size) const;
/**
* zero-initialize any remaining space in the align buffer and write
* it to the file. this is called by the destructor.
**/
void Flush() const;
private:
LibError WriteBlock() const;
PFile m_file;
shared_ptr m_alignedBuf;
mutable off_t m_alignedOfs;
mutable size_t m_bytesUsed;
};
typedef shared_ptr PUnalignedWriter;
#endif // #ifndef INCLUDED_WRITE_BUFFER