diff options
Diffstat (limited to 'plugins/Dbx_tree/src/FileAccess.h')
| -rw-r--r-- | plugins/Dbx_tree/src/FileAccess.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/plugins/Dbx_tree/src/FileAccess.h b/plugins/Dbx_tree/src/FileAccess.h new file mode 100644 index 0000000000..f49643e2a3 --- /dev/null +++ b/plugins/Dbx_tree/src/FileAccess.h @@ -0,0 +1,191 @@ +/*
+
+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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