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/*
dbx_tree: tree database driver for Miranda IM
Copyright 2007-2010 Michael "Protogenes" Kunz,
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#pragma once
#include <windows.h>
#include <time.h>
#include "stdint.h"
#include "sigslot.h"
class CFileAccess
{
public:
static const uint8_t cJournalSignature[20];
CFileAccess(const TCHAR* FileName);
virtual ~CFileAccess();
uint32_t Read(void* Buf, uint32_t Source, uint32_t Size)
{
return _Read(Buf, Source, Size);
};
bool Write(void* Buf, uint32_t Dest, uint32_t Size)
{
if (m_Journal.Use)
{
DWORD written;
TJournalEntry * data = reinterpret_cast<TJournalEntry*>(m_Journal.Buffer + m_Journal.BufUse);
data->Signature = 'writ';
data->Address = Dest;
data->Size = Size;
m_Journal.BufUse += 12;
if (Size + m_Journal.BufUse < sizeof(m_Journal.Buffer) - 12) // one journal header has always to fit in
{
memcpy(m_Journal.Buffer + m_Journal.BufUse, Buf, Size);
m_Journal.BufUse += Size;
} else {
WriteFile(m_Journal.hFile, m_Journal.Buffer, m_Journal.BufUse, &written, NULL);
WriteFile(m_Journal.hFile, Buf, Size, &written, NULL);
m_Journal.BufUse = 0;
}
} else {
_Write(Buf, Dest, Size);
}
return true;
};
void Invalidate(uint32_t Dest, uint32_t Size)
{
if (m_Journal.Use)
{
DWORD written;
TJournalEntry * data = reinterpret_cast<TJournalEntry*>(m_Journal.Buffer + m_Journal.BufUse);
data->Signature = 'inva';
data->Address = Dest;
data->Size = Size;
m_Journal.BufUse += 12;
if (m_Journal.BufUse > sizeof(m_Journal.Buffer) - 12)
{
WriteFile(m_Journal.hFile, m_Journal.Buffer, m_Journal.BufUse, &written, NULL);
m_Journal.BufUse = 0;
}
} else {
_Invalidate(Dest, Size);
}
};
void Flush()
{
if (m_Journal.Use)
{
if (m_Journal.BufUse)
{
DWORD written;
WriteFile(m_Journal.hFile, m_Journal.Buffer, m_Journal.BufUse, &written, NULL);
m_Journal.BufUse = 0;
}
FlushFileBuffers(m_Journal.hFile);
} else {
_Flush();
}
};
void UseJournal(bool UseIt)
{
m_Journal.Use = UseIt;
};
void CompleteTransaction()
{
if (m_Size != m_LastSize)
{
m_sigFileSizeChanged.emit(this, m_Size);
m_LastSize = m_Size;
}
};
void CloseTransaction()
{
if (m_Journal.Use)
{
DWORD written;
TJournalEntry * data = reinterpret_cast<TJournalEntry*>(m_Journal.Buffer + m_Journal.BufUse);
data->Signature = 'fini';
data->Address = 0;
data->Size = m_Size;
WriteFile(m_Journal.hFile, m_Journal.Buffer, m_Journal.BufUse + 12, &written, NULL);
m_Journal.BufUse = 0;
}
};
void CleanJournal();
uint32_t Size(uint32_t NewSize);
uint32_t Size()
{ return m_Size; };
void ReadOnly(bool ReadOnly)
{ m_ReadOnly = ReadOnly; };
bool ReadOnly()
{ return m_ReadOnly; };
typedef sigslot::signal2<CFileAccess *, uint32_t> TOnFileSizeChanged;
TOnFileSizeChanged & sigFileSizeChanged()
{ return m_sigFileSizeChanged; };
protected:
TCHAR* m_FileName;
struct {
bool Use;
TCHAR* FileName;
HANDLE hFile;
uint8_t Buffer[4096];
uint32_t BufUse;
} m_Journal;
uint32_t m_Size;
uint32_t m_AllocSize;
uint32_t m_AllocGranularity;
uint32_t m_MinAllocGranularity;
uint32_t m_MaxAllocGranularity;
uint32_t m_LastAllocTime;
bool m_ReadOnly;
uint32_t m_LastSize;
TOnFileSizeChanged m_sigFileSizeChanged;
virtual uint32_t _Read(void* Buf, uint32_t Source, uint32_t Size) = 0;
virtual uint32_t _Write(void* Buf, uint32_t Dest, uint32_t Size) = 0;
virtual void _Invalidate(uint32_t Dest, uint32_t Size) = 0;
virtual uint32_t _SetSize(uint32_t Size) = 0;
virtual void _Flush() = 0;
#pragma pack (push, 1)
typedef struct TJournalEntry
{
uint32_t Signature;
uint32_t Address;
uint32_t Size;
} TJournalEntry;
#pragma pack (pop)
void InitJournal();
void ProcessJournal();
};
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