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50637ff239
This commit defines a new ROMFS filesystem for storing read-only files that can be memory mapped, and a new VfsRom driver. Files opened from this filesystem support the buffer protocol. This allows naturally getting the memory-mapped address of the file using: - memoryview(file) - uctypes.addressof(file) Furthermore, if these files are .mpy files then their content can be referenced in-place when importing. Such imports take up a lot less RAM than importing from a normal filesystem. This is essentially dynamically frozen .mpy files, building on the revamped v6 .mpy file format. Signed-off-by: Damien George <damien@micropython.org>
48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_EXTMOD_VFS_ROM_H
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#define MICROPY_INCLUDED_EXTMOD_VFS_ROM_H
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#include "py/builtin.h"
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#include "py/obj.h"
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#if MICROPY_VFS_ROM
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typedef struct _mp_obj_vfs_rom_t mp_obj_vfs_rom_t;
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extern const mp_obj_type_t mp_type_vfs_rom;
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static inline const char *mp_vfs_rom_get_path_str(mp_obj_vfs_rom_t *self, mp_obj_t path) {
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return mp_obj_str_get_str(path);
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}
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mp_import_stat_t mp_vfs_rom_search_filesystem(mp_obj_vfs_rom_t *self, const char *path, size_t *size_out, const uint8_t **data_out);
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mp_obj_t mp_vfs_rom_file_open(mp_obj_t self_in, mp_obj_t path_in, mp_obj_t mode_in);
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#endif // MICROPY_VFS_ROM
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#endif // MICROPY_INCLUDED_EXTMOD_VFS_ROM_H
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