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circuitpython/extmod/vfs_fat_file.c

306 lines
11 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 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 "py/mpconfig.h"
#if MICROPY_VFS && MICROPY_VFS_FAT
#include <stdio.h>
#include "py/runtime.h"
#include "py/stream.h"
#include "py/mperrno.h"
#include "lib/oofatfs/ff.h"
#include "extmod/vfs_fat.h"
#include "supervisor/filesystem.h"
// this table converts from FRESULT to POSIX errno
const byte fresult_to_errno_table[20] = {
[FR_OK] = 0,
[FR_DISK_ERR] = MP_EIO,
[FR_INT_ERR] = MP_EIO,
[FR_NOT_READY] = MP_EBUSY,
[FR_NO_FILE] = MP_ENOENT,
[FR_NO_PATH] = MP_ENOENT,
[FR_INVALID_NAME] = MP_EINVAL,
[FR_DENIED] = MP_EACCES,
[FR_EXIST] = MP_EEXIST,
[FR_INVALID_OBJECT] = MP_EINVAL,
[FR_WRITE_PROTECTED] = MP_EROFS,
[FR_INVALID_DRIVE] = MP_ENODEV,
[FR_NOT_ENABLED] = MP_ENODEV,
[FR_NO_FILESYSTEM] = MP_ENODEV,
[FR_MKFS_ABORTED] = MP_EIO,
[FR_TIMEOUT] = MP_EIO,
[FR_LOCKED] = MP_EIO,
[FR_NOT_ENOUGH_CORE] = MP_ENOMEM,
[FR_TOO_MANY_OPEN_FILES] = MP_EMFILE,
[FR_INVALID_PARAMETER] = MP_EINVAL,
};
STATIC void file_obj_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_printf(print, "<io.%s %p>", mp_obj_get_type_str(self_in), MP_OBJ_TO_PTR(self_in));
}
STATIC mp_uint_t file_obj_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
pyb_file_obj_t *self = MP_OBJ_TO_PTR(self_in);
UINT sz_out;
FRESULT res = f_read(&self->fp, buf, size, &sz_out);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return MP_STREAM_ERROR;
}
return sz_out;
}
STATIC mp_uint_t file_obj_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
pyb_file_obj_t *self = MP_OBJ_TO_PTR(self_in);
UINT sz_out;
FRESULT res = f_write(&self->fp, buf, size, &sz_out);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return MP_STREAM_ERROR;
}
if (sz_out != size) {
// The FatFS documentation says that this means disk full.
*errcode = MP_ENOSPC;
return MP_STREAM_ERROR;
}
return sz_out;
}
STATIC mp_obj_t file_obj___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
return mp_stream_close(args[0]);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj___exit___obj, 4, 4, file_obj___exit__);
STATIC mp_uint_t file_obj_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
pyb_file_obj_t *self = MP_OBJ_TO_PTR(o_in);
if (request == MP_STREAM_SEEK) {
struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)(uintptr_t)arg;
switch (s->whence) {
case 0: // SEEK_SET
f_lseek(&self->fp, s->offset);
break;
case 1: // SEEK_CUR
f_lseek(&self->fp, f_tell(&self->fp) + s->offset);
break;
case 2: // SEEK_END
f_lseek(&self->fp, f_size(&self->fp) + s->offset);
break;
}
s->offset = f_tell(&self->fp);
return 0;
} else if (request == MP_STREAM_FLUSH) {
FRESULT res = f_sync(&self->fp);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return MP_STREAM_ERROR;
}
return 0;
} else if (request == MP_STREAM_CLOSE) {
// if fs==NULL then the file is closed and in that case this method is a no-op
if (self->fp.obj.fs != NULL) {
FRESULT res = f_close(&self->fp);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return MP_STREAM_ERROR;
}
}
return 0;
} else {
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
}
// Note: encoding is ignored for now; it's also not a valid kwarg for CPython's FileIO,
// but by adding it here we can use one single mp_arg_t array for open() and FileIO's constructor
STATIC const mp_arg_t file_open_args[] = {
{ MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
{ MP_QSTR_mode, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_QSTR(MP_QSTR_r)} },
{ MP_QSTR_encoding, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
};
#define FILE_OPEN_NUM_ARGS MP_ARRAY_SIZE(file_open_args)
STATIC mp_obj_t file_open(fs_user_mount_t *vfs, const mp_obj_type_t *type, mp_arg_val_t *args) {
int mode = 0;
const char *mode_s = mp_obj_str_get_str(args[1].u_obj);
// TODO make sure only one of r, w, x, a, and b, t are specified
while (*mode_s) {
switch (*mode_s++) {
case 'r':
mode |= FA_READ;
break;
case 'w':
mode |= FA_WRITE | FA_CREATE_ALWAYS;
break;
case 'x':
mode |= FA_WRITE | FA_CREATE_NEW;
break;
case 'a':
mode |= FA_WRITE | FA_OPEN_ALWAYS;
break;
case '+':
mode |= FA_READ | FA_WRITE;
break;
#if MICROPY_PY_IO_FILEIO
case 'b':
type = &mp_type_vfs_fat_fileio;
break;
#endif
case 't':
type = &mp_type_vfs_fat_textio;
break;
}
}
assert(vfs != NULL);
if ((mode & FA_WRITE) != 0 && !filesystem_is_writable_by_python(vfs)) {
mp_raise_OSError(MP_EROFS);
}
pyb_file_obj_t *o = m_new_obj_with_finaliser(pyb_file_obj_t);
o->base.type = type;
const char *fname = mp_obj_str_get_str(args[0].u_obj);
FRESULT res = f_open(&vfs->fatfs, &o->fp, fname, mode);
if (res != FR_OK) {
m_del_obj(pyb_file_obj_t, o);
mp_raise_OSError(fresult_to_errno_table[res]);
}
// If we're reading, turn on fast seek.
if (mode == FA_READ) {
// one call to determine how much space we need.
DWORD temp_table[2];
temp_table[0] = 2;
o->fp.cltbl = temp_table;
f_lseek(&o->fp, CREATE_LINKMAP);
DWORD size = (temp_table[0] + 1) * 2;
o->fp.cltbl = m_malloc_maybe(size * sizeof(DWORD), false);
if (o->fp.cltbl != NULL) {
o->fp.cltbl[0] = size;
res = f_lseek(&o->fp, CREATE_LINKMAP);
if (res != FR_OK) {
o->fp.cltbl = NULL;
}
}
}
// for 'a' mode, we must begin at the end of the file
if ((mode & FA_OPEN_ALWAYS) != 0) {
f_lseek(&o->fp, f_size(&o->fp));
}
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_obj_t file_obj_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
mp_arg_parse_all(n_args, args, kw_args, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
return file_open(NULL, type, arg_vals);
}
// TODO gc hook to close the file if not already closed
STATIC const mp_rom_map_elem_t 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_write), MP_ROM_PTR(&mp_stream_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_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___del__), 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(&file_obj___exit___obj) },
};
STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
#if MICROPY_PY_IO_FILEIO
STATIC const mp_stream_p_t fileio_stream_p = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
.read = file_obj_read,
.write = file_obj_write,
.ioctl = file_obj_ioctl,
};
const mp_obj_type_t mp_type_vfs_fat_fileio = {
{ &mp_type_type },
.name = MP_QSTR_FileIO,
.print = file_obj_print,
.make_new = file_obj_make_new,
.getiter = mp_identity_getiter,
.iternext = mp_stream_unbuffered_iter,
.protocol = &fileio_stream_p,
.locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
};
#endif
STATIC const mp_stream_p_t textio_stream_p = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
.read = file_obj_read,
.write = file_obj_write,
.ioctl = file_obj_ioctl,
.is_text = true,
};
const mp_obj_type_t mp_type_vfs_fat_textio = {
{ &mp_type_type },
.name = MP_QSTR_TextIOWrapper,
.print = file_obj_print,
.make_new = file_obj_make_new,
.getiter = mp_identity_getiter,
.iternext = mp_stream_unbuffered_iter,
.protocol = &textio_stream_p,
.locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
};
// Factory function for I/O stream classes
STATIC mp_obj_t fatfs_builtin_open_self(mp_obj_t self_in, mp_obj_t path, mp_obj_t mode) {
// TODO: analyze buffering args and instantiate appropriate type
fs_user_mount_t *self = MP_OBJ_TO_PTR(self_in);
mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
arg_vals[0].u_obj = path;
arg_vals[1].u_obj = mode;
arg_vals[2].u_obj = mp_const_none;
return file_open(self, &mp_type_vfs_fat_textio, arg_vals);
}
MP_DEFINE_CONST_FUN_OBJ_3(fat_vfs_open_obj, fatfs_builtin_open_self);
#endif // MICROPY_VFS && MICROPY_VFS_FAT