From 08f273cdf9fa97162f8a0e501c081170a9547769 Mon Sep 17 00:00:00 2001
From: Lucas Shaw <49287729+shawlucas@users.noreply.github.com>
Date: Fri, 12 Apr 2024 23:19:59 -0400
Subject: m_DLF.c OK (#170)

* m_DLF.c OK

* added comment
---
 src/code/m_DLF.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/code/m_DLF.c

(limited to 'src/code')

diff --git a/src/code/m_DLF.c b/src/code/m_DLF.c
new file mode 100644
index 0000000..0bfb4e9
--- /dev/null
+++ b/src/code/m_DLF.c
@@ -0,0 +1,97 @@
+#include "m_DLF.h"
+
+// Function names taken from Zelda64 Decompilation
+
+void Overlay_LoadGameState(GameStateOverlay* overlayEntry) {
+    void* vramStart;
+
+    if (overlayEntry->loadedRamAddr != NULL) {
+        return;
+    }
+
+    vramStart = overlayEntry->vramStart;
+    if (vramStart == NULL) {
+        overlayEntry->unk_28 = 0;
+        return;
+    }
+
+    overlayEntry->loadedRamAddr = malloc_r((uintptr_t)overlayEntry->vramEnd - (uintptr_t)vramStart);
+
+    if (overlayEntry->loadedRamAddr != NULL) {
+        ovlmgr_Load(overlayEntry->vromStart, overlayEntry->vromEnd, overlayEntry->vramStart, overlayEntry->vramEnd,
+                    overlayEntry->loadedRamAddr);
+        overlayEntry->unk_14 =
+            (void*)((overlayEntry->unk_14 != NULL)
+                        ? (void*)((uintptr_t)overlayEntry->unk_14 - (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                               (uintptr_t)overlayEntry->loadedRamAddr))
+                        : NULL);
+
+        overlayEntry->init =
+            (void*)((overlayEntry->init != NULL)
+                        ? (void*)((uintptr_t)overlayEntry->init - (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                             (uintptr_t)overlayEntry->loadedRamAddr))
+                        : NULL);
+
+        overlayEntry->destroy =
+            (void*)((overlayEntry->destroy != NULL)
+                        ? (void*)((uintptr_t)overlayEntry->destroy - (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                                (uintptr_t)overlayEntry->loadedRamAddr))
+                        : NULL);
+
+        overlayEntry->unk_20 =
+            (void*)((overlayEntry->unk_20 != NULL)
+                        ? (void*)((uintptr_t)overlayEntry->unk_20 - (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                               (uintptr_t)overlayEntry->loadedRamAddr))
+                        : NULL);
+
+        overlayEntry->unk_24 =
+            (void*)((overlayEntry->unk_24 != NULL)
+                        ? (void*)((uintptr_t)overlayEntry->unk_24 - (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                               (uintptr_t)overlayEntry->loadedRamAddr))
+                        : NULL);
+
+        overlayEntry->unk_28 = 0;
+    }
+}
+
+void Overlay_FreeGameState(GameStateOverlay* overlayEntry) {
+    s32 var_v0;
+
+    if (overlayEntry->loadedRamAddr != NULL) {
+        var_v0 = (overlayEntry->unk_28 != 0) ? -1 : 0;
+        if (var_v0 == 0) {
+            overlayEntry->unk_14 =
+                (void*)((overlayEntry->unk_14 != NULL) ? (void*)((uintptr_t)overlayEntry->unk_14 +
+                                                                 (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                            (uintptr_t)overlayEntry->loadedRamAddr))
+                                                       : NULL);
+
+            overlayEntry->init =
+                (void*)((overlayEntry->init != NULL) ? (void*)((uintptr_t)overlayEntry->init +
+                                                               (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                          (uintptr_t)overlayEntry->loadedRamAddr))
+                                                     : NULL);
+
+            overlayEntry->destroy =
+                (void*)((overlayEntry->destroy != NULL) ? (void*)((uintptr_t)overlayEntry->destroy +
+                                                                  (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                             (uintptr_t)overlayEntry->loadedRamAddr))
+                                                        : NULL);
+
+            overlayEntry->unk_20 =
+                (void*)((overlayEntry->unk_20 != NULL) ? (void*)((uintptr_t)overlayEntry->unk_20 +
+                                                                 (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                            (uintptr_t)overlayEntry->loadedRamAddr))
+                                                       : NULL);
+
+            overlayEntry->unk_24 =
+                (void*)((overlayEntry->unk_24 != NULL) ? (void*)((uintptr_t)overlayEntry->unk_24 +
+                                                                 (intptr_t)((uintptr_t)overlayEntry->vramStart -
+                                                                            (uintptr_t)overlayEntry->loadedRamAddr))
+                                                       : NULL);
+
+            free(overlayEntry->loadedRamAddr);
+            overlayEntry->loadedRamAddr = NULL;
+        }
+    }
+}
-- 
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