Make all file access 64-bit (uint64_t)

This changes the types of a big number of variables.

General rules:
- Using `uint64_t` in general. We also considered `int64_t` but eventually
  settled on keeping it unsigned, which is also closer to what one would expect
  with `size_t`/`off_t`.
- We only keep `int64_t` for `seek_end` (takes a negative offset from the end)
  and for the `Variant` bindings, since `Variant::INT` is `int64_t`. This means
  we only need to guard against passing negative values in `core_bind.cpp`.
- Using `uint32_t` integers for concepts not needing such a huge range, like
  pages, blocks, etc.

In addition:
- Improve usage of integer types in some related places; namely, `DirAccess`,
  core binds.

Note:
- On Windows, `_ftelli64` reports invalid values when using 32-bit MinGW with
  version < 8.0. This was an upstream bug fixed in 8.0. It breaks support for
  big files on 32-bit Windows builds made with that toolchain. We might add a
  workaround.

Fixes #44363.
Fixes godotengine/godot-proposals#400.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/modules/text_server_fb/dynamic_font_fb.cpp b/modules/text_server_fb/dynamic_font_fb.cpp
index dec1d6f83f..406f60b6f5 100644
--- a/modules/text_server_fb/dynamic_font_fb.cpp
+++ b/modules/text_server_fb/dynamic_font_fb.cpp
@@ -65,7 +65,7 @@ DynamicFontDataFallback::DataAtSize *DynamicFontDataFallback::get_data_for_size(
 					ERR_FAIL_V_MSG(nullptr, "Cannot open font file '" + font_path + "'.");
 				}
 
-				size_t len = f->get_len();
+				uint64_t len = f->get_len();
 				font_mem_cache.resize(len);
 				f->get_buffer(font_mem_cache.ptrw(), len);
 				font_mem = font_mem_cache.ptr();