78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/*
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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 "py/lexer.h"
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#include "lib/fatfs/ff.h"
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#include "lexerfatfs.h"
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typedef struct _mp_lexer_file_buf_t {
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FIL fp;
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byte buf[20];
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uint16_t len;
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uint16_t pos;
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} mp_lexer_file_buf_t;
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STATIC mp_uint_t file_buf_next_byte(mp_lexer_file_buf_t *fb) {
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if (fb->pos >= fb->len) {
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if (fb->len < sizeof(fb->buf)) {
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return MP_LEXER_EOF;
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} else {
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UINT n;
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f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
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if (n == 0) {
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return MP_LEXER_EOF;
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}
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fb->len = n;
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fb->pos = 0;
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}
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}
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return fb->buf[fb->pos++];
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}
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STATIC void file_buf_close(mp_lexer_file_buf_t *fb) {
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f_close(&fb->fp);
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m_del_obj(mp_lexer_file_buf_t, fb);
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}
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mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
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mp_lexer_file_buf_t *fb = m_new_obj_maybe(mp_lexer_file_buf_t);
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if (fb == NULL) {
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return NULL;
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}
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FRESULT res = f_open(&fb->fp, filename, FA_READ);
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if (res != FR_OK) {
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m_del_obj(mp_lexer_file_buf_t, fb);
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return NULL;
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}
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UINT n;
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f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
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fb->len = n;
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fb->pos = 0;
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return mp_lexer_new(qstr_from_str(filename), fb, (mp_lexer_stream_next_byte_t)file_buf_next_byte, (mp_lexer_stream_close_t)file_buf_close);
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}
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