godot/core/io/file_access_memory.h
Pedro J. Estébanez 469fa47e06
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>
2021-05-17 15:06:19 +02:00

79 lines
3.8 KiB
C++

/*************************************************************************/
/* file_access_memory.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
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/*************************************************************************/
#ifndef FILE_ACCESS_MEMORY_H
#define FILE_ACCESS_MEMORY_H
#include "core/os/file_access.h"
class FileAccessMemory : public FileAccess {
uint8_t *data = nullptr;
uint64_t length = 0;
mutable uint64_t pos = 0;
static FileAccess *create();
public:
static void register_file(String p_name, Vector<uint8_t> p_data);
static void cleanup();
virtual Error open_custom(const uint8_t *p_data, uint64_t p_len); ///< open a file
virtual Error _open(const String &p_path, int p_mode_flags); ///< open a file
virtual void close(); ///< close a file
virtual bool is_open() const; ///< true when file is open
virtual void seek(uint64_t p_position); ///< seek to a given position
virtual void seek_end(int64_t p_position); ///< seek from the end of file
virtual uint64_t get_position() const; ///< get position in the file
virtual uint64_t get_len() const; ///< get size of the file
virtual bool eof_reached() const; ///< reading passed EOF
virtual uint8_t get_8() const; ///< get a byte
virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const; ///< get an array of bytes
virtual Error get_error() const; ///< get last error
virtual void flush();
virtual void store_8(uint8_t p_byte); ///< store a byte
virtual void store_buffer(const uint8_t *p_src, uint64_t p_length); ///< store an array of bytes
virtual bool file_exists(const String &p_name); ///< return true if a file exists
virtual uint64_t _get_modified_time(const String &p_file) { return 0; }
virtual uint32_t _get_unix_permissions(const String &p_file) { return 0; }
virtual Error _set_unix_permissions(const String &p_file, uint32_t p_permissions) { return FAILED; }
FileAccessMemory() {}
};
#endif // FILE_ACCESS_MEMORY_H