just save

main/MessageHelper.h

@@ -0,0 +1,54 @@
+#ifndef MESSAGE_HELPER_H_INCLUDED
+#define MESSAGE_HELPER_H_INCLUDED
+
+#include <cinttypes>
+#include <QByteArray>
+#include <QByteArrayList>
+#include <QString>
+
+
+class MessageHelper {
+public:
+    enum PacketType : std::uint8_t {
+        POS_ECR = 0,
+        // POS_EXT = 1,
+        MESSAGE_RECEIVED_POSITIVE_ACK = 0x0A,
+        MESSAGE_RECEIVED_NEGATIVE_ACK = 0x0F
+        // POS_HOST_FORMAT_1_ENCRYPTED   = 0x11,
+        // POS_HOST_FORMAT_1_UNENCRYPTED = 0x21
+    };
+
+    explicit MessageHelper(QString const &posID = "T-TPS-SELF2002in",
+                           QString const &apak = "8AC304380E0E476BA2558B75DB9E2516");
+    explicit MessageHelper(QByteArray const &posID, QString const &apak);
+    ~MessageHelper();
+
+
+    void createRawPacket(PacketType PacketType,
+                         QByteArray const &encryptedPacketId,
+                         QByteArray const &message);
+
+    bool insertEncryptedPacketID(QByteArray const &encryptedPacketID);
+
+    QByteArrayList const &getMessageChunksToSend();
+    QByteArrayList const &createLoginMessageChunksToSend(char ext);
+
+// private:
+
+    QByteArray m_posID;
+    QString m_apak;
+    uint8_t m_posIDLength;
+    QByteArray m_messageHeaderPrefix;
+    QByteArray m_rawPacket; // without leading STX and trailing [ETX(1/2), LRC]
+    QByteArray m_loginMessage;
+    QByteArrayList m_messageChunkList;
+
+    bool setMessageHeaderPacketType(PacketType packetType);
+    bool createMessageHeaderPrefix(PacketType packetType, QByteArray const &encryptedPacketID);
+    void createLoginMessage();
+
+    static QByteArray const &mask(QByteArray &messageChunk);
+    static QByteArray const &unMask(QByteArray &messageChunk);
+};
+
+#endif // MESSAGE_HELPER_H_INCLUDED