Add error message

common/message/error.hpp

@@ -0,0 +1,68 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2025  Johannes Pohl
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+***/
+
+#pragma once
+
+
+// local headers
+#include "message.hpp"
+
+namespace msg
+{
+
+/**
+ * Generic error message
+ */
+class Error : public BaseMessage
+{
+public:
+    /// c'tor taking the @p code and @p message of error
+    explicit Error(uint32_t code, std::string message) : BaseMessage(message_type::kError), code(code), message(std::move(message))
+    {
+    }
+
+    Error() : Error(0, "")
+    {
+    }
+
+    void read(std::istream& stream) override
+    {
+        readVal(stream, code);
+        readVal(stream, message);
+    }
+
+    uint32_t getSize() const override{
+        return static_cast<uint32_t>(sizeof(uint32_t)   // code
+                                     + sizeof(uint32_t) // message len
+                                     + message.size());  // message;
+    }
+
+    /// error code
+    uint32_t code;
+    /// error message
+    std::string message;
+
+protected:
+    void doserialize(std::ostream& stream) const override
+    {
+        writeVal(stream, code);
+        writeVal(stream, message);
+    }
+};
+
+} // namespace msg