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micropython/extmod/vfs_map.c

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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/runtime.h"
#include "py/mperrno.h"
#include "extmod/vfs.h"
#include "extmod/vfs_map.h"
#if MICROPY_VFS_MAP
#define MAGIC_LEN (2)
#define MAGIC_BYTE0 ('M')
#define MAGIC_BYTE1 ('F')
#define GET_LE16(p) ((p)[0] | (p)[1] << 8)
#define GET_LE32(p) ((p)[0] | (p)[1] << 8 | (p)[2] << 16 | (p)[3] << 24)
struct _mp_obj_vfs_map_t {
mp_obj_base_t base;
mp_obj_t memory;
mp_obj_t device;
const uint8_t *filesystem;
};
mp_import_stat_t mp_vfs_map_search_filesystem(mp_obj_vfs_map_t *self, const char *path, size_t *size_out, const uint8_t **data_out) {
if (!(self->filesystem[0] == MAGIC_BYTE0 && self->filesystem[1] == MAGIC_BYTE1)) {
return MP_IMPORT_STAT_NO_EXIST;
}
if (path[0] == '/') {
++path;
}
size_t path_len = strlen(path);
const uint8_t *fs = self->filesystem + MAGIC_LEN;
for (;;) {
uint16_t nlen = GET_LE16(fs);
fs += 2;
if (nlen == 0) {
return MP_IMPORT_STAT_NO_EXIST;
}
uint32_t flen;
mp_import_stat_t type;
if (nlen & 0x8000) {
// A directory.
nlen &= 0x7fff;
flen = 0;
type = MP_IMPORT_STAT_DIR;
} else {
// A file.
flen = GET_LE32(fs);
fs += 4;
type = MP_IMPORT_STAT_FILE;
}
if (path_len == nlen && memcmp(path, fs, path_len) == 0) {
if (size_out != NULL) {
*size_out = flen;
*data_out = fs + nlen;
}
return type;
}
fs += nlen + flen;
}
}
static inline const char *vfs_map_get_path_str(mp_obj_vfs_map_t *self, mp_obj_t path) {
return mp_obj_str_get_str(path);
}
static mp_obj_t vfs_map_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 2, false);
mp_obj_vfs_map_t *self = m_new_obj(mp_obj_vfs_map_t);
self->base.type = type;
self->memory = args[0];
self->device = n_args == 1 ? mp_const_none : args[1];
mp_buffer_info_t bufinfo;
if (mp_get_buffer(self->memory, &bufinfo, MP_BUFFER_READ)) {
self->filesystem = bufinfo.buf;
} else {
self->filesystem = (const uint8_t *)(uintptr_t)mp_obj_get_int(self->memory);
}
return MP_OBJ_FROM_PTR(self);
}
static mp_obj_t vfs_map_mount(mp_obj_t self_in, mp_obj_t readonly, mp_obj_t mkfs) {
(void)self_in;
(void)readonly;
if (mp_obj_is_true(mkfs)) {
mp_raise_OSError(MP_EPERM);
}
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_3(vfs_map_mount_obj, vfs_map_mount);
static mp_obj_t vfs_map_umount(mp_obj_t self_in) {
(void)self_in;
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_1(vfs_map_umount_obj, vfs_map_umount);
// mp_vfs_map_file_open is implemented in vfs_map_file.c.
static MP_DEFINE_CONST_FUN_OBJ_3(vfs_map_open_obj, mp_vfs_map_file_open);
static mp_obj_t vfs_map_chdir(mp_obj_t self_in, mp_obj_t path_in) {
(void)self_in;
(void)path_in;
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_2(vfs_map_chdir_obj, vfs_map_chdir);
typedef struct _vfs_map_ilistdir_it_t {
mp_obj_base_t base;
mp_fun_1_t iternext;
bool is_str;
const char *path;
const uint8_t *index;
} vfs_map_ilistdir_it_t;
static mp_obj_t vfs_map_ilistdir_it_iternext(mp_obj_t self_in) {
vfs_map_ilistdir_it_t *self = MP_OBJ_TO_PTR(self_in);
if (self->index == NULL) {
return MP_OBJ_STOP_ITERATION;
}
const char *path = self->path;
if (path[0] == '/' || (path[0] == '.' && path[1] == '\0')) {
++path;
}
size_t path_len = strlen(path);
for (;;) {
uint16_t nlen = GET_LE16(self->index);
self->index += 2;
if (nlen == 0) {
self->index = NULL;
return MP_OBJ_STOP_ITERATION;
}
uint32_t flen;
uint32_t type;
if (nlen & 0x8000) {
// dir
nlen &= 0x7fff;
flen = 0;
type = MP_S_IFDIR;
} else {
// file
flen = GET_LE32(self->index);
self->index += 4;
type = MP_S_IFREG;
}
const uint8_t *nstr = self->index;
self->index += nlen + flen;
if ((path_len == 0 && memchr(nstr, '/', nlen) == NULL)
|| (path_len < nlen && nstr[path_len] == '/' && memcmp(path, nstr, path_len) == 0 && memchr(nstr + path_len + 1, '/', nlen - path_len - 1) == NULL)) {
// Make 4-tuple with info about this entry: (name, attr, inode, size)
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(4, NULL));
if (path_len > 0) {
nstr += path_len + 1;
nlen -= path_len + 1;
}
if (self->is_str) {
t->items[0] = mp_obj_new_str((const char *)nstr, nlen);
} else {
t->items[0] = mp_obj_new_bytes(nstr, nlen);
}
t->items[1] = MP_OBJ_NEW_SMALL_INT(type);
t->items[2] = MP_OBJ_NEW_SMALL_INT(0);
t->items[3] = mp_obj_new_int(flen);
return MP_OBJ_FROM_PTR(t);
}
}
}
static mp_obj_t vfs_map_ilistdir(mp_obj_t self_in, mp_obj_t path_in) {
mp_obj_vfs_map_t *self = MP_OBJ_TO_PTR(self_in);
vfs_map_ilistdir_it_t *iter = m_new_obj(vfs_map_ilistdir_it_t);
iter->base.type = &mp_type_polymorph_iter;
iter->iternext = vfs_map_ilistdir_it_iternext;
iter->is_str = mp_obj_get_type(path_in) == &mp_type_str;
iter->path = mp_obj_str_get_str(path_in);
if (!(self->filesystem[0] == MAGIC_BYTE0 && self->filesystem[1] == MAGIC_BYTE1)) {
mp_raise_OSError(MP_ENOENT);
}
if (iter->path[0] == '\0'
|| (iter->path[0] == '.' && iter->path[1] == '\0')
|| (iter->path[0] == '/' && iter->path[1] == '\0')) {
// pass
} else if (mp_vfs_map_search_filesystem(self, iter->path, NULL, NULL) != MP_IMPORT_STAT_DIR) {
mp_raise_OSError(MP_ENOENT);
}
iter->index = self->filesystem + MAGIC_LEN;
return MP_OBJ_FROM_PTR(iter);
}
static MP_DEFINE_CONST_FUN_OBJ_2(vfs_map_ilistdir_obj, vfs_map_ilistdir);
static mp_obj_t vfs_map_stat(mp_obj_t self_in, mp_obj_t path_in) {
mp_obj_vfs_map_t *self = MP_OBJ_TO_PTR(self_in);
const char *path = vfs_map_get_path_str(self, path_in);
size_t file_size;
const uint8_t *file_data;
mp_import_stat_t stat = mp_vfs_map_search_filesystem(self, path, &file_size, &file_data);
if (stat == MP_IMPORT_STAT_NO_EXIST) {
mp_raise_OSError(MP_ENOENT);
}
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
t->items[0] = MP_OBJ_NEW_SMALL_INT(stat == MP_IMPORT_STAT_FILE ? MP_S_IFREG : MP_S_IFDIR); // 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] = MP_OBJ_NEW_SMALL_INT(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);
}
static MP_DEFINE_CONST_FUN_OBJ_2(vfs_map_stat_obj, vfs_map_stat);
static mp_obj_t vfs_map_statvfs(mp_obj_t self_in, mp_obj_t path_in) {
(void)self_in;
(void)path_in;
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
t->items[0] = MP_OBJ_NEW_SMALL_INT(0); // f_bsize
t->items[1] = MP_OBJ_NEW_SMALL_INT(0); // f_frsize
t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // f_blocks
t->items[3] = MP_OBJ_NEW_SMALL_INT(0); // f_bfree
t->items[4] = MP_OBJ_NEW_SMALL_INT(0); // f_bavail
t->items[5] = MP_OBJ_NEW_SMALL_INT(0); // f_files
t->items[6] = MP_OBJ_NEW_SMALL_INT(0); // f_ffree
t->items[7] = MP_OBJ_NEW_SMALL_INT(0); // f_favail
t->items[8] = MP_OBJ_NEW_SMALL_INT(0); // f_flags
t->items[9] = MP_OBJ_NEW_SMALL_INT(65535); // f_namemax
return MP_OBJ_FROM_PTR(t);
}
static MP_DEFINE_CONST_FUN_OBJ_2(vfs_map_statvfs_obj, vfs_map_statvfs);
static mp_obj_t vfs_map_device(mp_obj_t self_in) {
mp_obj_vfs_map_t *self = MP_OBJ_TO_PTR(self_in);
return self->device;
}
static MP_DEFINE_CONST_FUN_OBJ_1(vfs_map_device_obj, vfs_map_device);
static const mp_rom_map_elem_t vfs_map_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&vfs_map_mount_obj) },
{ MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&vfs_map_umount_obj) },
{ MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&vfs_map_open_obj) },
{ MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&vfs_map_chdir_obj) },
{ MP_ROM_QSTR(MP_QSTR_ilistdir), MP_ROM_PTR(&vfs_map_ilistdir_obj) },
{ MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&vfs_map_stat_obj) },
{ MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&vfs_map_statvfs_obj) },
{ MP_ROM_QSTR(MP_QSTR_device), MP_ROM_PTR(&vfs_map_device_obj) },
};
static MP_DEFINE_CONST_DICT(vfs_map_locals_dict, vfs_map_locals_dict_table);
static mp_import_stat_t mp_vfs_map_import_stat(void *self_in, const char *path) {
mp_obj_vfs_map_t *self = self_in;
return mp_vfs_map_search_filesystem(self, path, NULL, NULL);
}
static size_t mp_vfs_map_memmap(void *self_in, const char *path, const void **ptr_out) {
mp_obj_vfs_map_t *self = self_in;
size_t size;
const uint8_t *data;
mp_import_stat_t stat = mp_vfs_map_search_filesystem(self, path, &size, &data);
if (stat == MP_IMPORT_STAT_FILE) {
*ptr_out = data;
return size;
} else {
*ptr_out = NULL;
return 0;
}
}
static const mp_vfs_proto_t vfs_map_proto = {
.import_stat = mp_vfs_map_import_stat,
.memmap = mp_vfs_map_memmap,
};
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_vfs_map,
MP_QSTR_VfsMap,
MP_TYPE_FLAG_NONE,
make_new, vfs_map_make_new,
protocol, &vfs_map_proto,
locals_dict, &vfs_map_locals_dict
);
#endif // MICROPY_VFS_MAP
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