/*
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"

static DWORD ofsThisSettings,ofsDestPrevSettings;

int WorkSettingsChain(DWORD ofsContact,DBContact *dbc,int firstTime)
{
	DBContactSettings *dbcsNew,dbcsOld;
	DWORD ofsDestThis;
	int ret;

	if (firstTime) {
		ofsDestPrevSettings = 0;
		ofsThisSettings = dbc->ofsFirstSettings;
		dbc->ofsFirstSettings = 0;
	}
	if (ofsThisSettings == 0)
		return ERROR_NO_MORE_ITEMS;
	if (!SignatureValid(ofsThisSettings,DBCONTACTSETTINGS_SIGNATURE)) {
		AddToStatus(STATUS_ERROR,TranslateT("Settings chain corrupted, further entries ignored"));
		return ERROR_NO_MORE_ITEMS;
	}
	if (PeekSegment(ofsThisSettings,&dbcsOld,sizeof(dbcsOld)) != ERROR_SUCCESS)
		return ERROR_NO_MORE_ITEMS;
	if (dbcsOld.cbBlob>256*1024 || dbcsOld.cbBlob == 0) {
		AddToStatus(STATUS_ERROR,TranslateT("Infeasibly large settings blob: skipping"));
		ofsThisSettings = dbcsOld.ofsNext;
		return ERROR_SUCCESS;
	}
	dbcsNew = (DBContactSettings*)_alloca(offsetof(DBContactSettings,blob)+dbcsOld.cbBlob);
	if ((ret = ReadSegment(ofsThisSettings,dbcsNew,offsetof(DBContactSettings,blob)+dbcsOld.cbBlob)) != ERROR_SUCCESS) {
		if (ret != ERROR_HANDLE_EOF) {   //eof is OK because blank space at the end doesn't matter
			return ERROR_NO_MORE_ITEMS;
		}
	}
	if ((dbcsNew->ofsModuleName = ConvertModuleNameOfs(dbcsOld.ofsModuleName)) == 0) {
		ofsThisSettings = dbcsOld.ofsNext;
		return ERROR_SUCCESS;
	}
	if (dbcsNew->blob[0] == 0) {
		AddToStatus(STATUS_MESSAGE,TranslateT("Empty settings group at %08X: skipping"),ofsThisSettings);
		ofsThisSettings = dbcsOld.ofsNext;
		return ERROR_SUCCESS;
	}
	dbcsNew->ofsNext = 0;
	//TODO? validate all settings in blob/compact if necessary
	if ((ofsDestThis = WriteSegment(WSOFS_END,dbcsNew,offsetof(DBContactSettings,blob)+dbcsNew->cbBlob)) == WS_ERROR) {
		return ERROR_HANDLE_DISK_FULL;
	}
	if (ofsDestPrevSettings) WriteSegment(ofsDestPrevSettings+offsetof(DBContactSettings,ofsNext),&ofsDestThis,sizeof(DWORD));
	else dbc->ofsFirstSettings = ofsDestThis;
	ofsDestPrevSettings = ofsDestThis;
	ofsThisSettings = dbcsOld.ofsNext;
	return ERROR_SUCCESS;
}