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/*
Miranda NG: the free IM client for Microsoft* Windows*
Copyright 2012-13 Miranda NG project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
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 "commonheaders.h"
void CDb3Mmap::Map()
{
m_hMap = CreateFileMapping(m_hDbFile, NULL, PAGE_READWRITE, 0, m_dwFileSize, NULL);
if (m_hMap) {
m_pDbCache = (PBYTE)MapViewOfFile(m_hMap, FILE_MAP_ALL_ACCESS/*FILE_MAP_WRITE*/, 0, 0 ,0);
if (!m_pDbCache)
DatabaseCorruption( _T("%s (MapViewOfFile failed. Code: %d)"));
}
else DatabaseCorruption( _T("%s (CreateFileMapping failed. Code: %d)"));
}
void CDb3Mmap::ReMap(DWORD needed)
{
KillTimer(NULL,m_flushBuffersTimerId);
log3("remapping %d + %d (file end: %d)",m_dwFileSize,needed,m_dbHeader.ofsFileEnd);
if (needed > m_ChunkSize) {
if (needed + m_dwFileSize > m_dbHeader.ofsFileEnd + m_ChunkSize)
DatabaseCorruption( _T("%s (Too large increment)"));
else {
DWORD x = m_dbHeader.ofsFileEnd/m_ChunkSize;
m_dwFileSize = (x+1)*m_ChunkSize;
}
}
else m_dwFileSize += m_ChunkSize;
// FlushViewOfFile(m_pDbCache, 0);
UnmapViewOfFile(m_pDbCache);
m_pDbCache = NULL;
CloseHandle(m_hMap);
Map();
}
void CDb3Mmap::DBMoveChunk(DWORD ofsDest,DWORD ofsSource,int bytes)
{
int x = 0;
//log3("move %d %08x->%08x",bytes,ofsSource,ofsDest);
if (ofsDest+bytes > m_dwFileSize) ReMap(ofsDest+bytes-m_dwFileSize);
if (ofsSource+bytes > m_dwFileSize) {
x = ofsSource+bytes-m_dwFileSize;
log0("buggy move!");
}
if (x > 0)
ZeroMemory(m_pDbCache+ofsDest+bytes-x, x);
if (ofsSource < m_dwFileSize)
MoveMemory(m_pDbCache+ofsDest,m_pDbCache+ofsSource, bytes-x);
logg();
}
//we are assumed to be in a mutex here
PBYTE CDb3Mmap::DBRead(DWORD ofs,int bytesRequired,int *bytesAvail)
{
// buggy read
if (ofs >= m_dwFileSize) {
//log2("read from outside %d@%08x",bytesRequired,ofs);
if (bytesAvail != NULL) *bytesAvail = m_ChunkSize;
return m_pNull;
}
//log3((ofs+bytesRequired > m_dwFileSize)?"read %d@%08x, only %d avaliable":"read %d@%08x",bytesRequired,ofs,m_dwFileSize-ofs);
if (bytesAvail != NULL) *bytesAvail = m_dwFileSize - ofs;
return m_pDbCache+ofs;
}
//we are assumed to be in a mutex here
void CDb3Mmap::DBWrite(DWORD ofs,PVOID pData,int bytes)
{
//log2("write %d@%08x",bytes,ofs);
if (ofs+bytes > m_dwFileSize) ReMap(ofs+bytes-m_dwFileSize);
MoveMemory(m_pDbCache+ofs,pData,bytes);
logg();
}
//we are assumed to be in a mutex here
void CDb3Mmap::DBFill(DWORD ofs,int bytes)
{
//log2("zerofill %d@%08x",bytes,ofs);
if (ofs+bytes <= m_dwFileSize)
ZeroMemory(m_pDbCache+ofs,bytes);
logg();
}
static VOID CALLBACK DoBufferFlushTimerProc(HWND hwnd, UINT message, UINT_PTR idEvent, DWORD dwTime)
{
for (int i=0; i < g_Dbs.getCount(); i++) {
CDb3Mmap* db = g_Dbs[i];
if (db->m_flushBuffersTimerId != idEvent)
continue;
if (!db->m_pDbCache)
return;
KillTimer(NULL, db->m_flushBuffersTimerId);
log0("tflush1");
if (FlushViewOfFile(db->m_pDbCache, 0) == 0) {
if (db->m_flushFailTick == 0)
db->m_flushFailTick = GetTickCount();
else if (GetTickCount() - db->m_flushFailTick > 5000)
db->DatabaseCorruption(NULL);
}
else db->m_flushFailTick = 0;
log0("tflush2");
}
}
void CDb3Mmap::DBFlush(int setting)
{
if (!setting) {
log0("nflush1");
if (m_safetyMode && m_pDbCache) {
if (FlushViewOfFile(m_pDbCache, 0) == 0) {
if (m_flushFailTick == 0)
m_flushFailTick = GetTickCount();
else if (GetTickCount() - m_flushFailTick > 5000)
DatabaseCorruption(NULL);
}
else
m_flushFailTick = 0;
}
log0("nflush2");
return;
}
KillTimer(NULL, m_flushBuffersTimerId);
m_flushBuffersTimerId = SetTimer(NULL, m_flushBuffersTimerId, 50, DoBufferFlushTimerProc);
}
int CDb3Mmap::InitCache(void)
{
m_dwFileSize = GetFileSize(m_hDbFile, NULL);
// Align to chunk
DWORD x = m_dwFileSize % m_ChunkSize;
if (x)
m_dwFileSize += m_ChunkSize - x;
Map();
// zero region for reads outside the file
m_pNull = (PBYTE)calloc(m_ChunkSize, 1);
return 0;
}
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