diff options
| author | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
|---|---|---|
| committer | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
| commit | 48540940b6c28bb4378abfeb500ec45a625b37b6 (patch) | |
| tree | 2ef294c0763e802f91d868bdef4229b6868527de /plugins/Dbx_tree/DirectAccess.cpp | |
| parent | 5c350913f011e119127baeb32a6aedeb4f0d33bc (diff) | |
initial commit
git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Diffstat (limited to 'plugins/Dbx_tree/DirectAccess.cpp')
| -rw-r--r-- | plugins/Dbx_tree/DirectAccess.cpp | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/plugins/Dbx_tree/DirectAccess.cpp b/plugins/Dbx_tree/DirectAccess.cpp new file mode 100644 index 0000000000..33785af7c4 --- /dev/null +++ b/plugins/Dbx_tree/DirectAccess.cpp @@ -0,0 +1,118 @@ +/*
+
+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.
+
+*/
+
+#include "DirectAccess.h"
+#include "Logger.h"
+
+CDirectAccess::CDirectAccess(const TCHAR* FileName)
+: CFileAccess(FileName)
+{
+ m_File = CreateFile(FileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, 0);
+ CHECKSYS(m_File != INVALID_HANDLE_VALUE,
+ logCRITICAL, _T("CreateFile failed"));
+
+ m_MinAllocGranularity = 0x00001000; // 4kb to avoid heavy fragmentation
+ m_AllocGranularity = 0x00008000; // 32kb
+ m_MaxAllocGranularity = 0x00100000; // 1mb for fast increasing
+
+ uint32_t size = GetFileSize(m_File, NULL);
+ size = (size + m_AllocGranularity - 1) & ~(m_AllocGranularity - 1);
+
+ if (size == 0)
+ size = m_AllocGranularity;
+
+ m_AllocSize = size;
+
+ InitJournal();
+}
+
+CDirectAccess::~CDirectAccess()
+{
+ if (m_File)
+ {
+ if (INVALID_SET_FILE_POINTER != SetFilePointer(m_File, m_Size, NULL, FILE_BEGIN))
+ SetEndOfFile(m_File);
+
+ CloseHandle(m_File);
+ }
+}
+
+uint32_t CDirectAccess::_Read(void* Buf, uint32_t Source, uint32_t Size)
+{
+ DWORD read = 0;
+
+ CHECKSYS(INVALID_SET_FILE_POINTER != SetFilePointer(m_File, Source, NULL, FILE_BEGIN),
+ logERROR, _T("SetFilePointer failed"));
+
+ CHECKSYS(ReadFile(m_File, Buf, Size, &read, NULL),
+ logERROR, _T("ReadFile failed"));
+
+ return read;
+}
+uint32_t CDirectAccess::_Write(void* Buf, uint32_t Dest, uint32_t Size)
+{
+ DWORD written = 0;
+
+ CHECKSYS(INVALID_SET_FILE_POINTER != SetFilePointer(m_File, Dest, NULL, FILE_BEGIN),
+ logERROR, _T("SetFilePointer failed"));
+
+ CHECKSYS(WriteFile(m_File, Buf, Size, &written, NULL),
+ logERROR, _T("WriteFile failed"));
+
+ return written;
+}
+
+uint32_t CDirectAccess::_SetSize(uint32_t Size)
+{
+ CHECKSYS(INVALID_SET_FILE_POINTER != SetFilePointer(m_File, Size, NULL, FILE_BEGIN),
+ logERROR, _T("SetFilePointer failed"));
+
+ CHECKSYS(SetEndOfFile(m_File),
+ logERROR, _T("SetEndOfFile failed"));
+
+ return Size;
+}
+
+void CDirectAccess::_Invalidate(uint32_t Dest, uint32_t Size)
+{
+ DWORD written;
+ uint8_t buf[4096];
+ memset(buf, 0, sizeof(buf));
+
+ CHECKSYS(INVALID_SET_FILE_POINTER != SetFilePointer(m_File, Dest, NULL, FILE_BEGIN),
+ logERROR, _T("SetFilePointer failed"));
+
+ while (Size > sizeof(buf))
+ {
+ Size -= sizeof(buf);
+ CHECKSYS(WriteFile(m_File, buf, sizeof(buf), &written, NULL),
+ logERROR, _T("WriteFile failed"));
+ }
+ CHECKSYS(WriteFile(m_File, buf, Size, &written, NULL),
+ logERROR, _T("WriteFile failed"));
+}
+
+void CDirectAccess::_Flush()
+{
+ CHECKSYS(FlushFileBuffers(m_File),
+ logERROR, _T("FlushFileBuffers failed"));
+}
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