pico: implement get_type_handler_metadata

32blit-pico/blit_launch.cpp

diff --git a/32blit-pico/blit_launch.cpp b/32blit-pico/blit_launch.cpp
index d922b14..0cafd70 100644
--- a/32blit-pico/blit_launch.cpp
+++ b/32blit-pico/blit_launch.cpp
@@ -468,6 +468,23 @@
 #endif
 }
 
+void *get_type_handler_metadata(const char *filetype) {
+#ifdef BUILD_LOADER
+  for(auto &handler : handlers) {
+    if(strncmp(filetype, handler.type, 4) == 0) {
+      auto ptr = (const uint8_t *)(FLASH_BASE + handler.offset);
+      auto header = (const BlitGameHeader *)ptr;
+      auto metadata_ptr = ptr + header->end;
+
+      // this really shouldn't fail if it's in the list, but be safe
+      if(memcmp(metadata_ptr, "BLITMETA", 8) == 0)
+        return (void *)metadata_ptr;
+    }
+  }
+#endif
+  return nullptr;
+}
+
 // .blit file writer
 void BlitWriter::init(uint32_t file_len) {
   this->file_len = file_len;

32blit-pico/blit_launch.hpp

diff --git a/32blit-pico/blit_launch.hpp b/32blit-pico/blit_launch.hpp
index abb7dce..e79bdde 100644
--- a/32blit-pico/blit_launch.hpp
+++ b/32blit-pico/blit_launch.hpp
@@ -21,6 +21,8 @@
 
 void erase_game(uint32_t offset);
 
+void *get_type_handler_metadata(const char *filetype);
+
 class BlitWriter final {
 public:
   void init(uint32_t file_len);

32blit-pico/main.cpp

diff --git a/32blit-pico/main.cpp b/32blit-pico/main.cpp
index 4dba8e2..dc1eae9 100644
--- a/32blit-pico/main.cpp
+++ b/32blit-pico/main.cpp
@@ -167,7 +167,7 @@
 
   ::launch_file,
   ::erase_game,
-  nullptr, // get_type_handler_metadata
+  ::get_type_handler_metadata,
 
   ::get_launch_path,