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, 2 deletions

diff --git a/editor/fileserver/editor_file_server.cpp b/editor/fileserver/editor_file_server.cpp
index d80003a12a..b04e518b0b 100644
--- a/editor/fileserver/editor_file_server.cpp
+++ b/editor/fileserver/editor_file_server.cpp
@@ -230,8 +230,7 @@ void EditorFileServer::_subthread_start(void *s) {
 				cd->files[id]->seek(offset);
 				Vector<uint8_t> buf;
 				buf.resize(blocklen);
-				int read = cd->files[id]->get_buffer(buf.ptrw(), blocklen);
-				ERR_CONTINUE(read < 0);
+				uint32_t read = cd->files[id]->get_buffer(buf.ptrw(), blocklen);
 
 				print_verbose("GET BLOCK - offset: " + itos(offset) + ", blocklen: " + itos(blocklen));