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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2022 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/reader.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "extmod/vfs_rom.h"
#if MICROPY_VFS_ROM
typedef struct _mp_obj_vfs_rom_file_t {
mp_obj_base_t base;
size_t file_size;
size_t file_offset;
const uint8_t *file_data;
} mp_obj_vfs_rom_file_t;
static const mp_obj_type_t mp_type_vfs_rom_fileio;
static const mp_obj_type_t mp_type_vfs_rom_textio;
mp_obj_t mp_vfs_rom_file_open(mp_obj_t self_in, mp_obj_t path_in, mp_obj_t mode_in) {
mp_obj_vfs_rom_t *self = MP_OBJ_TO_PTR(self_in);
const char *mode_s = mp_obj_str_get_str(mode_in);
const mp_obj_type_t *type = &mp_type_vfs_rom_textio;
while (*mode_s) {
switch (*mode_s++) {
case 'r':
break;
case 'w':
case 'a':
case '+':
mp_raise_OSError(MP_EROFS);
case 'b':
type = &mp_type_vfs_rom_fileio;
break;
case 't':
type = &mp_type_vfs_rom_textio;
break;
}
}
mp_obj_vfs_rom_file_t *o = m_new_obj(mp_obj_vfs_rom_file_t);
o->base.type = type;
o->file_offset = 0;
const char *path = mp_vfs_rom_get_path_str(self, path_in);
mp_import_stat_t stat = mp_vfs_rom_search_filesystem(self, path, &o->file_size, &o->file_data);
if (stat == MP_IMPORT_STAT_NO_EXIST) {
mp_raise_OSError(MP_ENOENT);
} else if (stat == MP_IMPORT_STAT_DIR) {
mp_raise_OSError(MP_EISDIR);
}
return MP_OBJ_FROM_PTR(o);
}
static mp_int_t vfs_rom_file_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
mp_obj_vfs_rom_file_t *self = MP_OBJ_TO_PTR(self_in);
if (flags == MP_BUFFER_READ) {
bufinfo->buf = (void *)self->file_data;
bufinfo->len = self->file_size;
bufinfo->typecode = 'B';
return 0;
} else {
// Can't write to a ROM file.
return 1;
}
}
static mp_uint_t vfs_rom_file_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
mp_obj_vfs_rom_file_t *self = MP_OBJ_TO_PTR(o_in);
size_t remain = self->file_size - self->file_offset;
if (size > remain) {
size = remain;
}
memcpy(buf, self->file_data + self->file_offset, size);
self->file_offset += size;
return size;
}
static mp_uint_t vfs_rom_file_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
mp_obj_vfs_rom_file_t *self = MP_OBJ_TO_PTR(o_in);
switch (request) {
case MP_STREAM_SEEK: {
struct mp_stream_seek_t *s = (struct mp_stream_seek_t *)arg;
if (s->whence == 0) { // SEEK_SET
self->file_offset = (size_t)s->offset;
} else if (s->whence == 1) { // SEEK_CUR
self->file_offset += s->offset;
} else { // SEEK_END
self->file_offset = self->file_size + s->offset;
}
if (self->file_offset > self->file_size) {
if (s->offset < 0) {
// Seek to before the start of the file.
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
self->file_offset = self->file_size;
}
s->offset = self->file_offset;
return 0;
}
case MP_STREAM_CLOSE:
return 0;
default:
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
}
static const mp_rom_map_elem_t vfs_rom_rawfile_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
{ MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj) },
{ MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
{ MP_ROM_QSTR(MP_QSTR_tell), MP_ROM_PTR(&mp_stream_tell_obj) },
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&mp_stream___exit___obj) },
};
static MP_DEFINE_CONST_DICT(vfs_rom_rawfile_locals_dict, vfs_rom_rawfile_locals_dict_table);
static const mp_stream_p_t vfs_rom_fileio_stream_p = {
.read = vfs_rom_file_read,
.ioctl = vfs_rom_file_ioctl,
};
static MP_DEFINE_CONST_OBJ_TYPE(
mp_type_vfs_rom_fileio,
MP_QSTR_FileIO,
MP_TYPE_FLAG_ITER_IS_STREAM,
buffer, vfs_rom_file_get_buffer,
protocol, &vfs_rom_fileio_stream_p,
locals_dict, &vfs_rom_rawfile_locals_dict
);
static const mp_stream_p_t vfs_rom_textio_stream_p = {
.read = vfs_rom_file_read,
.ioctl = vfs_rom_file_ioctl,
.is_text = true,
};
static MP_DEFINE_CONST_OBJ_TYPE(
mp_type_vfs_rom_textio,
MP_QSTR_TextIOWrapper,
MP_TYPE_FLAG_ITER_IS_STREAM,
protocol, &vfs_rom_textio_stream_p,
locals_dict, &vfs_rom_rawfile_locals_dict
);
#endif // MICROPY_VFS_ROM
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