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, 10 insertions, 10 deletions

diff --git a/core/os/file_access.cpp b/core/os/file_access.cpp
index ad234c2d49..d00d0ac5bb 100644
--- a/core/os/file_access.cpp
+++ b/core/os/file_access.cpp
@@ -367,10 +367,10 @@ Vector<String> FileAccess::get_csv_line(const String &p_delim) const {
 	return strings;
 }
 
-int FileAccess::get_buffer(uint8_t *p_dst, int p_length) const {
+uint64_t FileAccess::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
 	ERR_FAIL_COND_V(!p_dst && p_length > 0, -1);
-	ERR_FAIL_COND_V(p_length < 0, -1);
-	int i = 0;
+
+	uint64_t i = 0;
 	for (i = 0; i < p_length && !eof_reached(); i++) {
 		p_dst[i] = get_8();
 	}
@@ -380,11 +380,11 @@ int FileAccess::get_buffer(uint8_t *p_dst, int p_length) const {
 
 String FileAccess::get_as_utf8_string() const {
 	Vector<uint8_t> sourcef;
-	int len = get_len();
+	uint64_t len = get_len();
 	sourcef.resize(len + 1);
 
 	uint8_t *w = sourcef.ptrw();
-	int r = get_buffer(w, len);
+	uint64_t r = get_buffer(w, len);
 	ERR_FAIL_COND_V(r != len, String());
 	w[len] = 0;
 
@@ -550,8 +550,8 @@ void FileAccess::store_csv_line(const Vector<String> &p_values, const String &p_
 	store_line(line);
 }
 
-void FileAccess::store_buffer(const uint8_t *p_src, int p_length) {
-	for (int i = 0; i < p_length; i++) {
+void FileAccess::store_buffer(const uint8_t *p_src, uint64_t p_length) {
+	for (uint64_t i = 0; i < p_length; i++) {
 		store_8(p_src[i]);
 	}
 }
@@ -601,7 +601,7 @@ String FileAccess::get_md5(const String &p_file) {
 	unsigned char step[32768];
 
 	while (true) {
-		int br = f->get_buffer(step, 32768);
+		uint64_t br = f->get_buffer(step, 32768);
 		if (br > 0) {
 			ctx.update(step, br);
 		}
@@ -629,7 +629,7 @@ String FileAccess::get_multiple_md5(const Vector<String> &p_file) {
 		unsigned char step[32768];
 
 		while (true) {
-			int br = f->get_buffer(step, 32768);
+			uint64_t br = f->get_buffer(step, 32768);
 			if (br > 0) {
 				ctx.update(step, br);
 			}
@@ -658,7 +658,7 @@ String FileAccess::get_sha256(const String &p_file) {
 	unsigned char step[32768];
 
 	while (true) {
-		int br = f->get_buffer(step, 32768);
+		uint64_t br = f->get_buffer(step, 32768);
 		if (br > 0) {
 			ctx.update(step, br);
 		}