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micropython/ports/nrf/modules/os/microbitfs.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Mark Shannon
* Copyright (c) 2017 Ayke van Laethem
*
* 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 <stdio.h>
#include <sys/stat.h>
#include "microbitfs.h"
#include "drivers/flash.h"
#include "drivers/rng.h"
#include "py/obj.h"
#include "py/stream.h"
#include "py/runtime.h"
#include "extmod/vfs.h"
#if MICROPY_MBFS
#define DEBUG_FILE 0
#if DEBUG_FILE
#define DEBUG(s) printf s
#else
#define DEBUG(s) (void)0
#endif
/** How it works:
* The File System consists of up to MAX_CHUNKS_IN_FILE_SYSTEM chunks of CHUNK_SIZE each,
* plus one spare page which holds persistent configuration data and is used. for bulk erasing.
* The spare page is either the first or the last page and will be switched by a bulk erase.
* The exact number of chunks will depend on the amount of flash available.
*
* Each chunk consists of a one byte marker and a one byte tail
* The marker shows whether this chunk is the start of a file, the midst of a file
* (in which case it refers to the previous chunk in the file) or whether it is UNUSED
* (and erased) or FREED (which means it is unused, but not erased).
* Chunks are selected in a randomised round-robin fashion to even out wear on the flash
* memory as much as possible.
* A file consists of a linked list of chunks. The first chunk in a file contains its name
* as well as the end chunk and offset.
* Files are found by linear search of the chunks, this means that no meta-data needs to be stored
* outside of the file, which prevents wear hot-spots. Since there are fewer than 250 chunks,
* the search is fast enough.
*
* Chunks are numbered from 1 as we need to reserve 0 as the FREED marker.
*
* Writing to files relies on the persistent API which is high-level wrapper on top of the Nordic SDK.
*/
#define CHUNK_SIZE (1<<MBFS_LOG_CHUNK_SIZE)
#define DATA_PER_CHUNK (CHUNK_SIZE-2)
#define UNUSED_CHUNK 255
#define FREED_CHUNK 0
#define FILE_START 254
#define PERSISTENT_DATA_MARKER 253
/** Must be such that sizeof(file_header) < DATA_PER_CHUNK */
#define MAX_FILENAME_LENGTH 120
//Minimum number of free chunks to justify sweeping.
//If this is too low it may cause excessive wear
#define MIN_CHUNKS_FOR_SWEEP (FLASH_PAGESIZE / CHUNK_SIZE)
#define FILE_NOT_FOUND ((uint8_t)-1)
/** Maximum number of chunks allowed in filesystem. 252 chunks is 31.5kB */
#define MAX_CHUNKS_IN_FILE_SYSTEM 252
#define STATIC_ASSERT(e) extern char static_assert_failed[(e) ? 1 : -1]
typedef struct _file_descriptor_obj {
mp_obj_base_t base;
uint8_t start_chunk;
uint8_t seek_chunk;
uint8_t seek_offset;
bool writable;
bool open;
bool binary;
} file_descriptor_obj;
typedef struct _file_header {
uint8_t end_offset;
uint8_t name_len;
char filename[MAX_FILENAME_LENGTH];
} file_header;
typedef struct _file_chunk {
uint8_t marker;
union {
char data[DATA_PER_CHUNK];
file_header header;
};
uint8_t next_chunk;
} file_chunk;
typedef struct _persistent_config_t {
// Must start with a marker, so that we can identify it.
uint8_t marker; // Should always be PERSISTENT_DATA_MARKER
} persistent_config_t;
extern const mp_obj_type_t os_mbfs_fileio_type;
extern const mp_obj_type_t os_mbfs_textio_type;
// Page indexes count down from the end of ROM.
STATIC uint8_t first_page_index;
STATIC uint8_t last_page_index;
// The number of usable chunks in the file system.
STATIC uint8_t chunks_in_file_system;
// Index of chunk to start searches. This is randomised to even out wear.
STATIC uint8_t start_index;
STATIC file_chunk *file_system_chunks;
// Defined by the linker
extern byte _fs_start[];
extern byte _fs_end[];
STATIC_ASSERT((sizeof(file_chunk) == CHUNK_SIZE));
// From micro:bit memory.h
STATIC inline byte *rounddown(byte *addr, uint32_t align) {
return (byte*)(((uint32_t)addr)&(-align));
}
// From micro:bit memory.h
STATIC inline byte *roundup(byte *addr, uint32_t align) {
return (byte*)((((uint32_t)addr)+align-1)&(-align));
}
STATIC inline void *first_page(void) {
return _fs_end - FLASH_PAGESIZE * first_page_index;
}
STATIC inline void *last_page(void) {
return _fs_end - FLASH_PAGESIZE * last_page_index;
}
STATIC void init_limits(void) {
// First determine where to end
byte *end = _fs_end;
end = rounddown(end, FLASH_PAGESIZE)-FLASH_PAGESIZE;
last_page_index = (_fs_end - end)/FLASH_PAGESIZE;
// Now find the start
byte *start = roundup(end - CHUNK_SIZE*MAX_CHUNKS_IN_FILE_SYSTEM, FLASH_PAGESIZE);
while (start < _fs_start) {
start += FLASH_PAGESIZE;
}
first_page_index = (_fs_end - start)/FLASH_PAGESIZE;
chunks_in_file_system = (end-start)>>MBFS_LOG_CHUNK_SIZE;
}
STATIC void randomise_start_index(void) {
start_index = rng_generate_random_word() % chunks_in_file_system + 1;
}
void microbit_filesystem_init(void) {
init_limits();
randomise_start_index();
file_chunk *base = first_page();
if (base->marker == PERSISTENT_DATA_MARKER) {
file_system_chunks = &base[(FLASH_PAGESIZE>>MBFS_LOG_CHUNK_SIZE)-1];
} else if (((file_chunk *)last_page())->marker == PERSISTENT_DATA_MARKER) {
file_system_chunks = &base[-1];
} else {
flash_write_byte((uint32_t)&((file_chunk *)last_page())->marker, PERSISTENT_DATA_MARKER);
file_system_chunks = &base[-1];
}
}
STATIC void copy_page(void *dest, void *src) {
DEBUG(("FILE DEBUG: Copying page from %lx to %lx.\r\n", (uint32_t)src, (uint32_t)dest));
flash_page_erase((uint32_t)dest);
file_chunk *src_chunk = src;
file_chunk *dest_chunk = dest;
uint32_t chunks = FLASH_PAGESIZE>>MBFS_LOG_CHUNK_SIZE;
for (uint32_t i = 0; i < chunks; i++) {
if (src_chunk[i].marker != FREED_CHUNK) {
flash_write_bytes((uint32_t)&dest_chunk[i], (uint8_t*)&src_chunk[i], CHUNK_SIZE);
}
}
}
// Move entire file system up or down one page, copying all used chunks
// Freed chunks are not copied, so become erased.
// There should be no erased chunks before the sweep (or it would be unnecessary)
// but if there are this should work correctly.
//
// The direction of the sweep depends on whether the persistent data is in the first or last page
// The persistent data is copied to RAM, leaving its page unused.
// Then all the pages are copied, one by one, into the adjacent newly unused page.
// Finally, the persistent data is saved back to the opposite end of the filesystem from whence it came.
//
STATIC void filesystem_sweep(void) {
persistent_config_t config;
uint8_t *page;
uint8_t *end_page;
int step;
uint32_t page_size = FLASH_PAGESIZE;
DEBUG(("FILE DEBUG: Sweeping file system\r\n"));
if (((file_chunk *)first_page())->marker == PERSISTENT_DATA_MARKER) {
config = *(persistent_config_t *)first_page();
page = first_page();
end_page = last_page();
step = page_size;
} else {
config = *(persistent_config_t *)last_page();
page = last_page();
end_page = first_page();
step = -page_size;
}
while (page != end_page) {
uint8_t *next_page = page+step;
flash_page_erase((uint32_t)page);
copy_page(page, next_page);
page = next_page;
}
flash_page_erase((uint32_t)end_page);
flash_write_bytes((uint32_t)end_page, (uint8_t*)&config, sizeof(config));
microbit_filesystem_init();
}
STATIC inline byte *seek_address(file_descriptor_obj *self) {
return (byte*)&(file_system_chunks[self->seek_chunk].data[self->seek_offset]);
}
STATIC uint8_t microbit_find_file(const char *name, int name_len) {
for (uint8_t index = 1; index <= chunks_in_file_system; index++) {
const file_chunk *p = &file_system_chunks[index];
if (p->marker != FILE_START)
continue;
if (p->header.name_len != name_len)
continue;
if (memcmp(name, &p->header.filename[0], name_len) == 0) {
DEBUG(("FILE DEBUG: File found. index %d\r\n", index));
return index;
}
}
DEBUG(("FILE DEBUG: File not found.\r\n"));
return FILE_NOT_FOUND;
}
// Return a free, erased chunk.
// Search the chunks:
// 1 If an UNUSED chunk is found, then return that.
// 2. If an entire page of FREED chunks is found, then erase the page and return the first chunk
// 3. If the number of FREED chunks is >= MIN_CHUNKS_FOR_SWEEP, then
// 3a. Sweep the filesystem and restart.
// 3b. Fail and return FILE_NOT_FOUND
//
STATIC uint8_t find_chunk_and_erase(void) {
// Start search at a random chunk to spread the wear more evenly.
// Search for unused chunk
uint8_t index = start_index;
do {
const file_chunk *p = &file_system_chunks[index];
if (p->marker == UNUSED_CHUNK) {
DEBUG(("FILE DEBUG: Unused chunk found: %d\r\n", index));
return index;
}
index++;
if (index == chunks_in_file_system+1) index = 1;
} while (index != start_index);
// Search for FREED page, and total up FREED chunks
uint32_t freed_chunks = 0;
index = start_index;
uint32_t chunks_per_page = FLASH_PAGESIZE>>MBFS_LOG_CHUNK_SIZE;
do {
const file_chunk *p = &file_system_chunks[index];
if (p->marker == FREED_CHUNK) {
freed_chunks++;
}
if (FLASH_IS_PAGE_ALIGNED(p)) {
uint32_t i;
for (i = 0; i < chunks_per_page; i++) {
if (p[i].marker != FREED_CHUNK)
break;
}
if (i == chunks_per_page) {
DEBUG(("FILE DEBUG: Found freed page of chunks: %d\r\n", index));
flash_page_erase((uint32_t)&file_system_chunks[index]);
return index;
}
}
index++;
if (index == chunks_in_file_system+1) index = 1;
} while (index != start_index);
DEBUG(("FILE DEBUG: %lu free chunks\r\n", freed_chunks));
if (freed_chunks < MIN_CHUNKS_FOR_SWEEP) {
return FILE_NOT_FOUND;
}
// No freed pages, so sweep file system.
filesystem_sweep();
// This is guaranteed to succeed.
return find_chunk_and_erase();
}
STATIC mp_obj_t microbit_file_name(file_descriptor_obj *fd) {
return mp_obj_new_str(&(file_system_chunks[fd->start_chunk].header.filename[0]), file_system_chunks[fd->start_chunk].header.name_len);
}
STATIC file_descriptor_obj *microbit_file_descriptor_new(uint8_t start_chunk, bool write, bool binary);
STATIC void clear_file(uint8_t chunk) {
do {
flash_write_byte((uint32_t)&(file_system_chunks[chunk].marker), FREED_CHUNK);
DEBUG(("FILE DEBUG: Freeing chunk %d.\n", chunk));
chunk = file_system_chunks[chunk].next_chunk;
} while (chunk <= chunks_in_file_system);
}
STATIC file_descriptor_obj *microbit_file_open(const char *name, size_t name_len, bool write, bool binary) {
if (name_len > MAX_FILENAME_LENGTH) {
return NULL;
}
uint8_t index = microbit_find_file(name, name_len);
if (write) {
if (index != FILE_NOT_FOUND) {
// Free old file
clear_file(index);
}
index = find_chunk_and_erase();
if (index == FILE_NOT_FOUND) {
mp_raise_OSError(MP_ENOSPC);
}
flash_write_byte((uint32_t)&(file_system_chunks[index].marker), FILE_START);
flash_write_byte((uint32_t)&(file_system_chunks[index].header.name_len), name_len);
flash_write_bytes((uint32_t)&(file_system_chunks[index].header.filename[0]), (uint8_t*)name, name_len);
} else {
if (index == FILE_NOT_FOUND) {
return NULL;
}
}
return microbit_file_descriptor_new(index, write, binary);
}
STATIC file_descriptor_obj *microbit_file_descriptor_new(uint8_t start_chunk, bool write, bool binary) {
file_descriptor_obj *res = mp_obj_malloc(file_descriptor_obj, binary ? &os_mbfs_fileio_type : &os_mbfs_textio_type);
res->start_chunk = start_chunk;
res->seek_chunk = start_chunk;
res->seek_offset = file_system_chunks[start_chunk].header.name_len+2;
res->writable = write;
res->open = true;
res->binary = binary;
return res;
}
STATIC mp_obj_t microbit_remove(mp_obj_t filename) {
size_t name_len;
const char *name = mp_obj_str_get_data(filename, &name_len);
mp_uint_t index = microbit_find_file(name, name_len);
if (index == 255) {
mp_raise_OSError(MP_ENOENT);
}
clear_file(index);
return mp_const_none;
}
STATIC void check_file_open(file_descriptor_obj *self) {
if (!self->open) {
mp_raise_ValueError(MP_ERROR_TEXT("I/O operation on closed file"));
}
}
STATIC int advance(file_descriptor_obj *self, uint32_t n, bool write) {
DEBUG(("FILE DEBUG: Advancing from chunk %d, offset %d.\r\n", self->seek_chunk, self->seek_offset));
self->seek_offset += n;
if (self->seek_offset == DATA_PER_CHUNK) {
self->seek_offset = 0;
if (write) {
uint8_t next_chunk = find_chunk_and_erase();
if (next_chunk == FILE_NOT_FOUND) {
clear_file(self->start_chunk);
self->open = false;
return MP_ENOSPC;
}
// Link next chunk to this one
flash_write_byte((uint32_t)&(file_system_chunks[self->seek_chunk].next_chunk), next_chunk);
flash_write_byte((uint32_t)&(file_system_chunks[next_chunk].marker), self->seek_chunk);
}
self->seek_chunk = file_system_chunks[self->seek_chunk].next_chunk;
}
DEBUG(("FILE DEBUG: Advanced to chunk %d, offset %d.\r\n", self->seek_chunk, self->seek_offset));
return 0;
}
STATIC mp_uint_t microbit_file_read(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode) {
file_descriptor_obj *self = (file_descriptor_obj *)obj;
check_file_open(self);
if (self->writable || file_system_chunks[self->start_chunk].marker == FREED_CHUNK) {
*errcode = MP_EBADF;
return MP_STREAM_ERROR;
}
uint32_t bytes_read = 0;
uint8_t *data = buf;
while (1) {
mp_uint_t to_read = DATA_PER_CHUNK - self->seek_offset;
if (file_system_chunks[self->seek_chunk].next_chunk == UNUSED_CHUNK) {
uint8_t end_offset = file_system_chunks[self->start_chunk].header.end_offset;
if (end_offset == UNUSED_CHUNK) {
to_read = 0;
} else {
to_read = MIN(to_read, (mp_uint_t)end_offset-self->seek_offset);
}
}
to_read = MIN(to_read, size-bytes_read);
if (to_read == 0) {
break;
}
memcpy(data+bytes_read, seek_address(self), to_read);
advance(self, to_read, false);
bytes_read += to_read;
}
return bytes_read;
}
STATIC mp_uint_t microbit_file_write(mp_obj_t obj, const void *buf, mp_uint_t size, int *errcode) {
file_descriptor_obj *self = (file_descriptor_obj *)obj;
check_file_open(self);
if (!self->writable || file_system_chunks[self->start_chunk].marker == FREED_CHUNK) {
*errcode = MP_EBADF;
return MP_STREAM_ERROR;
}
uint32_t len = size;
const uint8_t *data = buf;
while (len) {
uint32_t to_write = MIN(((uint32_t)(DATA_PER_CHUNK - self->seek_offset)), len);
flash_write_bytes((uint32_t)seek_address(self), data, to_write);
int err = advance(self, to_write, true);
if (err) {
*errcode = err;
return MP_STREAM_ERROR;
}
data += to_write;
len -= to_write;
}
return size;
}
STATIC void microbit_file_close(file_descriptor_obj *fd) {
if (fd->writable) {
flash_write_byte((uint32_t)&(file_system_chunks[fd->start_chunk].header.end_offset), fd->seek_offset);
}
fd->open = false;
}
STATIC mp_obj_t microbit_file_list(void) {
mp_obj_t res = mp_obj_new_list(0, NULL);
for (uint8_t index = 1; index <= chunks_in_file_system; index++) {
if (file_system_chunks[index].marker == FILE_START) {
mp_obj_t name = mp_obj_new_str(&file_system_chunks[index].header.filename[0], file_system_chunks[index].header.name_len);
mp_obj_list_append(res, name);
}
}
return res;
}
STATIC mp_obj_t microbit_file_size(mp_obj_t filename) {
size_t name_len;
const char *name = mp_obj_str_get_data(filename, &name_len);
uint8_t chunk = microbit_find_file(name, name_len);
if (chunk == 255) {
mp_raise_OSError(MP_ENOENT);
}
mp_uint_t len = 0;
uint8_t end_offset = file_system_chunks[chunk].header.end_offset;
uint8_t offset = file_system_chunks[chunk].header.name_len+2;
while (file_system_chunks[chunk].next_chunk != UNUSED_CHUNK) {
len += DATA_PER_CHUNK - offset;
chunk = file_system_chunks[chunk].next_chunk;
offset = 0;
}
len += end_offset - offset;
return mp_obj_new_int(len);
}
STATIC mp_uint_t file_read_byte(file_descriptor_obj *fd) {
if (file_system_chunks[fd->seek_chunk].next_chunk == UNUSED_CHUNK) {
uint8_t end_offset = file_system_chunks[fd->start_chunk].header.end_offset;
if (end_offset == UNUSED_CHUNK || fd->seek_offset == end_offset) {
return (mp_uint_t)-1;
}
}
mp_uint_t res = file_system_chunks[fd->seek_chunk].data[fd->seek_offset];
advance(fd, 1, false);
return res;
}
// Now follows the code to integrate this filesystem into the os module.
mp_lexer_t *os_mbfs_new_reader(const char *filename) {
file_descriptor_obj *fd = microbit_file_open(filename, strlen(filename), false, false);
if (fd == NULL) {
mp_raise_OSError(MP_ENOENT);
}
mp_reader_t reader;
reader.data = fd;
reader.readbyte = (mp_uint_t(*)(void*))file_read_byte;
reader.close = (void(*)(void*))microbit_file_close; // no-op
return mp_lexer_new(qstr_from_str(filename), reader);
}
mp_import_stat_t os_mbfs_import_stat(const char *path) {
uint8_t chunk = microbit_find_file(path, strlen(path));
if (chunk == FILE_NOT_FOUND) {
return MP_IMPORT_STAT_NO_EXIST;
} else {
return MP_IMPORT_STAT_FILE;
}
}
STATIC mp_obj_t os_mbfs_file_name(mp_obj_t self) {
file_descriptor_obj *fd = (file_descriptor_obj*)self;
return microbit_file_name(fd);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_mbfs_file_name_obj, os_mbfs_file_name);
STATIC mp_obj_t os_mbfs_file_close(mp_obj_t self) {
file_descriptor_obj *fd = (file_descriptor_obj*)self;
microbit_file_close(fd);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_mbfs_file_close_obj, os_mbfs_file_close);
STATIC mp_obj_t os_mbfs_remove(mp_obj_t name) {
return microbit_remove(name);
}
MP_DEFINE_CONST_FUN_OBJ_1(os_mbfs_remove_obj, os_mbfs_remove);
STATIC mp_obj_t os_mbfs_file___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
return os_mbfs_file_close(args[0]);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(os_mbfs_file___exit___obj, 4, 4, os_mbfs_file___exit__);
typedef struct {
mp_obj_base_t base;
mp_fun_1_t iternext;
uint8_t index;
} os_mbfs_ilistdir_it_t;
STATIC mp_obj_t os_mbfs_ilistdir_it_iternext(mp_obj_t self_in) {
os_mbfs_ilistdir_it_t *self = MP_OBJ_TO_PTR(self_in);
// Read until the next FILE_START chunk.
for (; self->index <= chunks_in_file_system; self->index++) {
if (file_system_chunks[self->index].marker != FILE_START) {
continue;
}
// Get the file name as str object.
mp_obj_t name = mp_obj_new_str(&file_system_chunks[self->index].header.filename[0], file_system_chunks[self->index].header.name_len);
// make 3-tuple with info about this entry
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(3, NULL));
t->items[0] = name;
t->items[1] = MP_OBJ_NEW_SMALL_INT(MP_S_IFREG); // all entries are files
t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // no inode number
self->index++;
return MP_OBJ_FROM_PTR(t);
}
return MP_OBJ_STOP_ITERATION;
}
STATIC mp_obj_t os_mbfs_ilistdir(void) {
os_mbfs_ilistdir_it_t *iter = mp_obj_malloc(os_mbfs_ilistdir_it_t, &mp_type_polymorph_iter);
iter->iternext = os_mbfs_ilistdir_it_iternext;
iter->index = 1;
return MP_OBJ_FROM_PTR(iter);
}
MP_DEFINE_CONST_FUN_OBJ_0(os_mbfs_ilistdir_obj, os_mbfs_ilistdir);
MP_DEFINE_CONST_FUN_OBJ_0(os_mbfs_listdir_obj, microbit_file_list);
STATIC mp_obj_t microbit_file_writable(mp_obj_t self) {
return mp_obj_new_bool(((file_descriptor_obj *)self)->writable);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(microbit_file_writable_obj, microbit_file_writable);
STATIC const mp_map_elem_t os_mbfs_file_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&os_mbfs_file_close_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_name), (mp_obj_t)&os_mbfs_file_name_obj },
{ MP_ROM_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
{ MP_ROM_QSTR(MP_QSTR___exit__), (mp_obj_t)&os_mbfs_file___exit___obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_writable), (mp_obj_t)&microbit_file_writable_obj },
/* Stream methods */
{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readinto), (mp_obj_t)&mp_stream_readinto_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj},
};
STATIC MP_DEFINE_CONST_DICT(os_mbfs_file_locals_dict, os_mbfs_file_locals_dict_table);
STATIC const mp_stream_p_t textio_stream_p = {
.read = microbit_file_read,
.write = microbit_file_write,
.is_text = true,
};
MP_DEFINE_CONST_OBJ_TYPE(
os_mbfs_textio_type,
MP_QSTR_TextIO,
MP_TYPE_FLAG_NONE,
protocol, &textio_stream_p,
locals_dict, &os_mbfs_file_locals_dict
);
STATIC const mp_stream_p_t fileio_stream_p = {
.read = microbit_file_read,
.write = microbit_file_write,
};
MP_DEFINE_CONST_OBJ_TYPE(
os_mbfs_fileio_type,
MP_QSTR_FileIO,
MP_TYPE_FLAG_NONE,
protocol, &fileio_stream_p,
locals_dict, &os_mbfs_file_locals_dict
);
// From micro:bit fileobj.c
mp_obj_t os_mbfs_open(size_t n_args, const mp_obj_t *args) {
/// -1 means default; 0 explicitly false; 1 explicitly true.
int read = -1;
int text = -1;
if (n_args == 2) {
size_t len;
const char *mode = mp_obj_str_get_data(args[1], &len);
for (mp_uint_t i = 0; i < len; i++) {
if (mode[i] == 'r' || mode[i] == 'w') {
if (read >= 0) {
goto mode_error;
}
read = (mode[i] == 'r');
} else if (mode[i] == 'b' || mode[i] == 't') {
if (text >= 0) {
goto mode_error;
}
text = (mode[i] == 't');
} else {
goto mode_error;
}
}
}
size_t name_len;
const char *filename = mp_obj_str_get_data(args[0], &name_len);
file_descriptor_obj *res = microbit_file_open(filename, name_len, read == 0, text == 0);
if (res == NULL) {
mp_raise_OSError(MP_ENOENT);
}
return res;
mode_error:
mp_raise_ValueError(MP_ERROR_TEXT("illegal mode"));
}
STATIC mp_obj_t os_mbfs_stat(mp_obj_t filename) {
mp_obj_t file_size = microbit_file_size(filename);
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
t->items[0] = MP_OBJ_NEW_SMALL_INT(MP_S_IFREG); // st_mode
t->items[1] = MP_OBJ_NEW_SMALL_INT(0); // st_ino
t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // st_dev
t->items[3] = MP_OBJ_NEW_SMALL_INT(0); // st_nlink
t->items[4] = MP_OBJ_NEW_SMALL_INT(0); // st_uid
t->items[5] = MP_OBJ_NEW_SMALL_INT(0); // st_gid
t->items[6] = file_size; // st_size
t->items[7] = MP_OBJ_NEW_SMALL_INT(0); // st_atime
t->items[8] = MP_OBJ_NEW_SMALL_INT(0); // st_mtime
t->items[9] = MP_OBJ_NEW_SMALL_INT(0); // st_ctime
return MP_OBJ_FROM_PTR(t);
}
MP_DEFINE_CONST_FUN_OBJ_1(os_mbfs_stat_obj, os_mbfs_stat);
#endif // MICROPY_MBFS