/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright 2012-14 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"

//the cache has not been loaded when these functions are used

int CDb3Mmap::CreateDbHeaders(const DBSignature& _sign)
{
	DWORD bytesWritten;

	CopyMemory(m_dbHeader.signature, &_sign, sizeof(m_dbHeader.signature));

	m_dbHeader.version = DB_095_VERSION;
	m_dbHeader.ofsFileEnd = sizeof(struct DBHeader);
	m_dbHeader.slackSpace = 0;
	m_dbHeader.contactCount = 0;
	m_dbHeader.ofsFirstContact = 0;
	m_dbHeader.ofsFirstModuleName = 0;
	m_dbHeader.ofsUser = 0;
	//create user
	m_dbHeader.ofsUser = m_dbHeader.ofsFileEnd;
	m_dbHeader.ofsFileEnd += sizeof(DBContact);
	SetFilePointer(m_hDbFile, 0, NULL, FILE_BEGIN);
	WriteFile(m_hDbFile, &m_dbHeader, sizeof(m_dbHeader), &bytesWritten,NULL);

	DBContact user = { 0 };
	user.signature = DBCONTACT_SIGNATURE;
	SetFilePointer(m_hDbFile, m_dbHeader.ofsUser, NULL, FILE_BEGIN);
	WriteFile(m_hDbFile, &user, sizeof(DBContact), &bytesWritten, NULL);
	FlushFileBuffers(m_hDbFile);
	return 0;
}

int CDb3Mmap::CheckDbHeaders()
{
	if (memcmp(m_dbHeader.signature, &dbSignatureU,  sizeof(m_dbHeader.signature)) &&
		 memcmp(m_dbHeader.signature, &dbSignatureE,  sizeof(m_dbHeader.signature)) &&
		 memcmp(m_dbHeader.signature, &dbSignatureIM, sizeof(m_dbHeader.signature)))
		return EGROKPRF_UNKHEADER;

	if (m_dbHeader.version != DB_095_VERSION && m_dbHeader.version != DB_094_VERSION && m_dbHeader.version != DB_OLD_VERSION)
		return EGROKPRF_VERNEWER;
	
	if (m_dbHeader.ofsUser == 0)
		return EGROKPRF_DAMAGED;

	return 0;
}

void CDb3Mmap::WriteSignature(DBSignature &sign)
{
	memcpy(&m_dbHeader.signature, &sign, sizeof(DBSignature));
	DBWrite(0, &sign, sizeof(DBSignature));
}