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280 lines
9.4 KiB
280 lines
9.4 KiB
/*
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* This file is part of the Micro Python 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) 2013, 2014 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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#include <stdio.h>
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#include <errno.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "lib/fatfs/ff.h"
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#include "file.h"
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extern const mp_obj_type_t mp_type_fileio;
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extern const mp_obj_type_t mp_type_textio;
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// this table converts from FRESULT to POSIX errno
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const byte fresult_to_errno_table[20] = {
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[FR_OK] = 0,
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[FR_DISK_ERR] = EIO,
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[FR_INT_ERR] = EIO,
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[FR_NOT_READY] = EBUSY,
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[FR_NO_FILE] = ENOENT,
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[FR_NO_PATH] = ENOENT,
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[FR_INVALID_NAME] = EINVAL,
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[FR_DENIED] = EACCES,
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[FR_EXIST] = EEXIST,
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[FR_INVALID_OBJECT] = EINVAL,
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[FR_WRITE_PROTECTED] = EROFS,
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[FR_INVALID_DRIVE] = ENODEV,
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[FR_NOT_ENABLED] = ENODEV,
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[FR_NO_FILESYSTEM] = ENODEV,
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[FR_MKFS_ABORTED] = EIO,
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[FR_TIMEOUT] = EIO,
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[FR_LOCKED] = EIO,
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[FR_NOT_ENOUGH_CORE] = ENOMEM,
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[FR_TOO_MANY_OPEN_FILES] = EMFILE,
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[FR_INVALID_PARAMETER] = EINVAL,
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};
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typedef struct _pyb_file_obj_t {
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mp_obj_base_t base;
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FIL fp;
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} pyb_file_obj_t;
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void file_obj_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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mp_printf(print, "<io.%s %p>", mp_obj_get_type_str(self_in), self_in);
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}
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STATIC mp_uint_t file_obj_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
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pyb_file_obj_t *self = self_in;
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UINT sz_out;
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FRESULT res = f_read(&self->fp, buf, size, &sz_out);
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if (res != FR_OK) {
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*errcode = fresult_to_errno_table[res];
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return MP_STREAM_ERROR;
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}
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return sz_out;
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}
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STATIC mp_uint_t file_obj_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
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pyb_file_obj_t *self = self_in;
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UINT sz_out;
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FRESULT res = f_write(&self->fp, buf, size, &sz_out);
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if (res != FR_OK) {
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*errcode = fresult_to_errno_table[res];
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return MP_STREAM_ERROR;
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}
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if (sz_out != size) {
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// The FatFS documentation says that this means disk full.
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*errcode = ENOSPC;
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return MP_STREAM_ERROR;
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}
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return sz_out;
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}
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STATIC mp_obj_t file_obj_flush(mp_obj_t self_in) {
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pyb_file_obj_t *self = self_in;
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f_sync(&self->fp);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(file_obj_flush_obj, file_obj_flush);
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mp_obj_t file_obj_close(mp_obj_t self_in) {
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pyb_file_obj_t *self = self_in;
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f_close(&self->fp);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(file_obj_close_obj, file_obj_close);
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mp_obj_t file_obj___exit__(mp_uint_t n_args, const mp_obj_t *args) {
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return file_obj_close(args[0]);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj___exit___obj, 4, 4, file_obj___exit__);
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STATIC mp_uint_t file_obj_ioctl(mp_obj_t o_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
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pyb_file_obj_t *self = o_in;
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if (request == MP_STREAM_SEEK) {
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struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
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switch (s->whence) {
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case 0: // SEEK_SET
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f_lseek(&self->fp, s->offset);
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break;
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case 1: // SEEK_CUR
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if (s->offset != 0) {
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*errcode = ENOTSUP;
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return MP_STREAM_ERROR;
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}
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// no-operation
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break;
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case 2: // SEEK_END
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f_lseek(&self->fp, f_size(&self->fp) + s->offset);
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break;
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}
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s->offset = f_tell(&self->fp);
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return 0;
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} else {
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*errcode = EINVAL;
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return MP_STREAM_ERROR;
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}
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}
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// Note: encoding is ignored for now; it's also not a valid kwarg for CPython's FileIO,
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// but by adding it here we can use one single mp_arg_t array for open() and FileIO's constructor
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STATIC const mp_arg_t file_open_args[] = {
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{ MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = mp_const_none} },
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{ MP_QSTR_mode, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_QSTR(MP_QSTR_r)} },
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{ MP_QSTR_encoding, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
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};
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#define FILE_OPEN_NUM_ARGS MP_ARRAY_SIZE(file_open_args)
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STATIC mp_obj_t file_open(mp_obj_t type, mp_arg_val_t *args) {
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int mode = 0;
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const char *mode_s = mp_obj_str_get_str(args[1].u_obj);
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// TODO make sure only one of r, w, x, a, and b, t are specified
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while (*mode_s) {
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switch (*mode_s++) {
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case 'r':
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mode |= FA_READ;
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break;
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case 'w':
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mode |= FA_WRITE | FA_CREATE_ALWAYS;
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break;
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case 'x':
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mode |= FA_WRITE | FA_CREATE_NEW;
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break;
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case 'a':
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mode |= FA_WRITE | FA_OPEN_ALWAYS;
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break;
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case '+':
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mode |= FA_READ | FA_WRITE;
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break;
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#if MICROPY_PY_IO_FILEIO
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case 'b':
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type = (mp_obj_t)&mp_type_fileio;
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break;
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#endif
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case 't':
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type = (mp_obj_t)&mp_type_textio;
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break;
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}
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}
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pyb_file_obj_t *o = m_new_obj_with_finaliser(pyb_file_obj_t);
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o->base.type = type;
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const char *fname = mp_obj_str_get_str(args[0].u_obj);
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FRESULT res = f_open(&o->fp, fname, mode);
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if (res != FR_OK) {
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m_del_obj(pyb_file_obj_t, o);
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(fresult_to_errno_table[res])));
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}
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// for 'a' mode, we must begin at the end of the file
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if ((mode & FA_OPEN_ALWAYS) != 0) {
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f_lseek(&o->fp, f_size(&o->fp));
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}
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return o;
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}
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STATIC mp_obj_t file_obj_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
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mp_arg_parse_all_kw_array(n_args, n_kw, args, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
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return file_open(type_in, arg_vals);
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}
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// TODO gc hook to close the file if not already closed
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STATIC const mp_map_elem_t rawfile_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readinto), (mp_obj_t)&mp_stream_readinto_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
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{ MP_OBJ_NEW_QSTR(MP_QSTR_readlines), (mp_obj_t)&mp_stream_unbuffered_readlines_obj},
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{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_flush), (mp_obj_t)&file_obj_flush_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&file_obj_close_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_seek), (mp_obj_t)&mp_stream_seek_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_tell), (mp_obj_t)&mp_stream_tell_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&file_obj_close_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&file_obj___exit___obj },
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};
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STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
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#if MICROPY_PY_IO_FILEIO
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STATIC const mp_stream_p_t fileio_stream_p = {
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.read = file_obj_read,
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.write = file_obj_write,
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.ioctl = file_obj_ioctl,
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};
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const mp_obj_type_t mp_type_fileio = {
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{ &mp_type_type },
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.name = MP_QSTR_FileIO,
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.print = file_obj_print,
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.make_new = file_obj_make_new,
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.getiter = mp_identity,
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.iternext = mp_stream_unbuffered_iter,
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.stream_p = &fileio_stream_p,
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.locals_dict = (mp_obj_t)&rawfile_locals_dict,
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};
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#endif
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STATIC const mp_stream_p_t textio_stream_p = {
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.read = file_obj_read,
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.write = file_obj_write,
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.ioctl = file_obj_ioctl,
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.is_text = true,
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};
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const mp_obj_type_t mp_type_textio = {
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{ &mp_type_type },
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.name = MP_QSTR_TextIOWrapper,
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.print = file_obj_print,
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.make_new = file_obj_make_new,
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.getiter = mp_identity,
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.iternext = mp_stream_unbuffered_iter,
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.stream_p = &textio_stream_p,
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.locals_dict = (mp_obj_t)&rawfile_locals_dict,
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};
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// Factory function for I/O stream classes
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mp_obj_t mp_builtin_open(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
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// TODO: analyze buffering args and instantiate appropriate type
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mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
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mp_arg_parse_all(n_args, args, kwargs, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
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return file_open((mp_obj_t)&mp_type_textio, arg_vals);
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
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