/*
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 CDb3Mmap::WorkSettingsChain(DBContact *dbc, int firstTime)
{
	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)) {
		cb->pfnAddLogMessage(STATUS_ERROR, TranslateT("Settings chain corrupted, further entries ignored"));
		return ERROR_NO_MORE_ITEMS;
	}
	DBContactSettings dbcsOld;
	if (PeekSegment(ofsThisSettings, &dbcsOld, sizeof(dbcsOld)) != ERROR_SUCCESS)
		return ERROR_NO_MORE_ITEMS;

	if (dbcsOld.cbBlob > 256 * 1024 || dbcsOld.cbBlob == 0) {
		cb->pfnAddLogMessage(STATUS_ERROR, TranslateT("Infeasibly large settings blob: skipping"));
		ofsThisSettings = dbcsOld.ofsNext;
		return ERROR_SUCCESS;
	}

	DBContactSettings *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) {
		cb->pfnAddLogMessage(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;
}