From ac7b085449fb49f54225d22c7c229da6ad120e2b Mon Sep 17 00:00:00 2001
From: Javier <dev.git@javispedro.com>
Date: Sun, 12 Sep 2021 19:41:12 +0200
Subject: remove PEN_EPOCH mistake and get usertime from the pen

---
 smartpen.cc | 55 +++++++++++++++++++++++++++++--------------------------
 1 file changed, 29 insertions(+), 26 deletions(-)

(limited to 'smartpen.cc')

diff --git a/smartpen.cc b/smartpen.cc
index ce26a31..686170d 100644
--- a/smartpen.cc
+++ b/smartpen.cc
@@ -16,7 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <QtCore/QDateTime>
+#include <QtCore/QDataStream>
 #include <QtCore/QDebug>
 #include <QtCore/QDeadlineTimer>
 #include <QtCore/QThread>
@@ -26,7 +26,6 @@
 #include "xmlutils.h"
 #include "smartpen.h"
 
-#define PEN_EPOCH (1289335960000LL)
 #define PEN_MTU OBEX_MAXIMUM_MTU
 #define PEN_TIMEOUT_SECONDS 5
 
@@ -86,7 +85,7 @@ QByteArray Smartpen::getObject(const QString &name)
 	return result;
 }
 
-QString Smartpen::getParameter(Parameters parameter)
+QByteArray Smartpen::getParameter(Parameter parameter)
 {
 	QString objectName = QString("ppdata?key=pp%1").arg(uint(parameter), 4, 16);
 	QByteArray data = getObject(objectName);
@@ -97,21 +96,36 @@ QString Smartpen::getParameter(Parameters parameter)
 
 	if (!r.atEnd()) {
 		QXmlStreamAttributes attrs = r.attributes();
-		return attrs.value("value").toString();
+		QString value = attrs.value("value").toString();
+		if (!value.isEmpty()) {
+			if (value.startsWith("0x")) {
+				return QByteArray::fromHex(value.mid(2).toLatin1());
+			} else {
+				qWarning() << "Unknown parameter return format: " << value;
+			}
+		}
 	}
 
-	return QString();
+	return QByteArray();
 }
 
 QString Smartpen::getPenName()
 {
-	QString name = getParameter(PenName);
-	if (name.isEmpty()) {
-		return name; // Empty string if unknown name
-	}
+	return QString::fromUtf8(getParameter(PenName));
+}
 
-	QByteArray hex = QByteArray::fromHex(name.mid(2).toLatin1());
-	return QString::fromUtf8(hex);
+Smartpen::PenTime Smartpen::getPenTime(Parameter parameter)
+{
+	Smartpen::PenTime time;
+	QByteArray value = getParameter(parameter);
+	if (value.isEmpty() || value.size() != sizeof(Smartpen::PenTime)) {
+		qWarning() << "got invalid value for pen time: " << value.toHex();
+		return 0;
+	}
+	QDataStream ds(value);
+	ds.setByteOrder(QDataStream::LittleEndian);
+	ds >> time;
+	return time;
 }
 
 QVariantMap Smartpen::getPenInfo()
@@ -216,22 +230,11 @@ QByteArray Smartpen::getPaperReplay(PenTime from)
 	return getObject(QString("lspdata?name=com.livescribe.paperreplay.PaperReplay&start_time=%1&returnVersion=0.3&remoteCaller=WIN_LD_200").arg(from));
 }
 
-qint64 Smartpen::toPenTime(const QDateTime &dt)
+QDateTime Smartpen::fromPenTime(PenTime userTime, PenTime penTime)
 {
-	if (dt.isValid()) {
-		return dt.toMSecsSinceEpoch() - PEN_EPOCH;
-	} else {
-		return 0;
-	}
-}
-
-QDateTime Smartpen::fromPenTime(qint64 t)
-{
-	if (t) {
-		return QDateTime::fromMSecsSinceEpoch(t + PEN_EPOCH).toLocalTime();
-	} else {
-		return QDateTime();
-	}
+	QDateTime dt = QDateTime::fromMSecsSinceEpoch(penTime + userTime, Qt::UTC);
+	dt.setTimeSpec(Qt::LocalTime); // userTime is actually in LocalTime, so override tz conversion
+	return dt;
 }
 
 QString Smartpen::toPenSerial(quint64 id)
-- 
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