/*
Miranda Database Tool
Copyright (C) 2001-2005  Richard Hughes

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"

extern DBSignature dbSignature;

int CDb3Base::WorkInitialCheckHeaders()
{
	if (memcmp(m_dbHeader.signature, &dbSignature, sizeof(m_dbHeader.signature))) {
		cb->pfnAddLogMessage(STATUS_FATAL,TranslateT("Database signature is corrupted, automatic repair is impossible"));
		return ERROR_BAD_FORMAT;
	}
	if (m_dbHeader.version != 0x00000700) {
		cb->pfnAddLogMessage(STATUS_FATAL,TranslateT("Database is marked as belonging to an unknown version of Miranda"));
		return ERROR_BAD_FORMAT;
	}
	return ERROR_SUCCESS;
}

int CDb3Base::WorkInitialChecks(int firstTime)
{
	sourceFileSize = GetFileSize(m_hDbFile,NULL);
	if (sourceFileSize == 0) {
		cb->pfnAddLogMessage(STATUS_WARNING,TranslateT("Database is newly created and has no data to process"));
		cb->pfnAddLogMessage(STATUS_SUCCESS,TranslateT("Processing completed successfully"));
		return ERROR_INVALID_DATA;
	}

	int res = WorkInitialCheckHeaders();
	if (res)
		return res;

	m_hMap = CreateFileMapping(m_hDbFile, NULL, cb->bAggressive?PAGE_WRITECOPY:PAGE_READONLY, 0, 0, NULL);
	if (m_hMap)
		m_pDbCache = (BYTE*)MapViewOfFile(m_hMap, cb->bAggressive?FILE_MAP_COPY:FILE_MAP_READ, 0, 0 ,0);
	else {
		cb->pfnAddLogMessage(STATUS_FATAL,TranslateT("Can't create file mapping (%u)"),GetLastError());
		return ERROR_ACCESS_DENIED;
	}

	if (!m_pDbCache) {
		cb->pfnAddLogMessage(STATUS_FATAL,TranslateT("Can't create map view of file (%u)"),GetLastError());
		return ERROR_ACCESS_DENIED;
	}
	if (ReadSegment(0,&m_dbHeader,sizeof(m_dbHeader)) != ERROR_SUCCESS) return ERROR_READ_FAULT;
	if (WriteSegment(0,&m_dbHeader,sizeof(m_dbHeader)) == WS_ERROR) return ERROR_HANDLE_DISK_FULL;
	cb->spaceUsed = m_dbHeader.ofsFileEnd-m_dbHeader.slackSpace;
	m_dbHeader.ofsFileEnd = sizeof(m_dbHeader);
	return ERROR_NO_MORE_ITEMS;
}