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, 3 insertions, 3 deletions

diff --git a/modules/webm/video_stream_webm.cpp b/modules/webm/video_stream_webm.cpp
index a6b64b342e..15bf9dbf2d 100644
--- a/modules/webm/video_stream_webm.cpp
+++ b/modules/webm/video_stream_webm.cpp
@@ -62,10 +62,10 @@ public:
 
 	virtual int Read(long long pos, long len, unsigned char *buf) {
 		if (file) {
-			if (file->get_position() != (size_t)pos) {
+			if (file->get_position() != (uint64_t)pos) {
 				file->seek(pos);
 			}
-			if (file->get_buffer(buf, len) == len) {
+			if (file->get_buffer(buf, len) == (uint64_t)len) {
 				return 0;
 			}
 		}
@@ -74,7 +74,7 @@ public:
 
 	virtual int Length(long long *total, long long *available) {
 		if (file) {
-			const size_t len = file->get_len();
+			const uint64_t len = file->get_len();
 			if (total) {
 				*total = len;
 			}