Load packets using a packet factory

wxdata/source/scwx/wsr88d/rpg/packet_factory.cpp

@@ -0,0 +1,73 @@
+#include <scwx/wsr88d/rpg/packet_factory.hpp>
+
+#include <scwx/wsr88d/rpg/linked_contour_vector_packet.hpp>
+#include <scwx/wsr88d/rpg/linked_vector_packet.hpp>
+#include <scwx/wsr88d/rpg/set_color_level_packet.hpp>
+#include <scwx/wsr88d/rpg/text_and_special_symbol_packet.hpp>
+#include <scwx/wsr88d/rpg/unlinked_contour_vector_packet.hpp>
+#include <scwx/wsr88d/rpg/unlinked_vector_packet.hpp>
+
+#include <unordered_map>
+
+#include <boost/log/trivial.hpp>
+
+namespace scwx
+{
+namespace wsr88d
+{
+namespace rpg
+{
+
+static const std::string logPrefix_ = "[scwx::wsr88d::rpg::packet_factory] ";
+
+typedef std::function<std::shared_ptr<Packet>(std::istream&)>
+   CreateMessageFunction;
+
+static const std::unordered_map<uint16_t, CreateMessageFunction> create_ {
+   {1, TextAndSpecialSymbolPacket::Create},
+   {2, TextAndSpecialSymbolPacket::Create},
+   {6, LinkedVectorPacket::Create},
+   {7, UnlinkedVectorPacket::Create},
+   {8, TextAndSpecialSymbolPacket::Create},
+   {9, LinkedVectorPacket::Create},
+   {10, UnlinkedVectorPacket::Create},
+   {0x0802, SetColorLevelPacket::Create},
+   {0x0E03, LinkedContourVectorPacket::Create},
+   {0x3501, UnlinkedContourVectorPacket::Create}};
+
+std::shared_ptr<Packet> PacketFactory::Create(std::istream& is)
+{
+   std::shared_ptr<Packet> packet      = nullptr;
+   bool                    packetValid = true;
+
+   uint16_t packetCode;
+
+   is.read(reinterpret_cast<char*>(&packetCode), 2);
+   packetCode = ntohs(packetCode);
+
+   if (is.eof())
+   {
+      packetValid = false;
+   }
+
+   is.seekg(-2, std::ios_base::cur);
+
+   if (packetValid && create_.find(packetCode) == create_.end())
+   {
+      BOOST_LOG_TRIVIAL(warning)
+         << logPrefix_ << "Unknown packet code: " << packetCode << " (0x"
+         << std::hex << packetCode << std::dec << ")";
+      packetValid = false;
+   }
+
+   if (packetValid)
+   {
+      packet = create_.at(packetCode)(is);
+   }
+
+   return packet;
+}
+
+} // namespace rpg
+} // namespace wsr88d
+} // namespace scwx