2 files changed, 116 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.c b/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.c
new file mode 100644
index 0000000..b42f539
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.c
@@ -0,0 +1,88 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_iostreamromfs.h"
+
+// Checks if the mode is a kind of reading
+static bool IsReadMode(const char *mode);
+
+// Checks if the file starts with the given prefix
+static bool HasPrefix(const char *file, const char *prefix);
+
+static FILE *TryOpenFile(const char *file, const char *mode);
+static FILE *TryOpenInRomfs(const char *file, const char *mode);
+
+/* Nintendo 3DS applications may embed resources in the executable. The
+  resources are stored in a special read-only partition prefixed with
+  'romfs:/'. As such, when opening a file, we should first try the romfs
+  unless sdmc is specifically mentioned.
+*/
+FILE *N3DS_FileOpen(const char *file, const char *mode)
+{
+    // romfs are read-only
+    if (!IsReadMode(mode)) {
+        return fopen(file, mode);
+    }
+
+    // If the path has an explicit prefix, we skip the guess work
+    if (HasPrefix(file, "romfs:/") || HasPrefix(file, "sdmc:/")) {
+        return fopen(file, mode);
+    }
+
+    return TryOpenFile(file, mode);
+}
+
+static bool IsReadMode(const char *mode)
+{
+    return SDL_strchr(mode, 'r') != NULL;
+}
+
+static bool HasPrefix(const char *file, const char *prefix)
+{
+    return SDL_strncmp(prefix, file, SDL_strlen(prefix)) == 0;
+}
+
+static FILE *TryOpenFile(const char *file, const char *mode)
+{
+    FILE *fp = NULL;
+
+    fp = TryOpenInRomfs(file, mode);
+    if (!fp) {
+        fp = fopen(file, mode);
+    }
+
+    return fp;
+}
+
+FILE *TryOpenInRomfs(const char *file, const char *mode)
+{
+    FILE *fp = NULL;
+    char *prefixed_filepath = NULL;
+
+    if (SDL_asprintf(&prefixed_filepath, "romfs:/%s", file) < 0) {
+        return NULL;
+    }
+
+    fp = fopen(prefixed_filepath, mode);
+
+    SDL_free(prefixed_filepath);
+    return fp;
+}
diff --git a/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.h b/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.h
new file mode 100644
index 0000000..b931390
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/io/n3ds/SDL_iostreamromfs.h
@@ -0,0 +1,28 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_iostreamromfs_h_
+#define SDL_iostreamromfs_h_
+
+FILE *N3DS_FileOpen(const char *file, const char *mode);
+
+#endif // SDL_iostreamromfs_h_