circuitpython/stmhal/lexerfatfs.c

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/*
* This file is part of the Micro Python 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.
*/
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#include <stdio.h>
#include "py/lexer.h"
#include "lib/fatfs/ff.h"
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typedef struct _mp_lexer_file_buf_t {
FIL fp;
byte buf[20];
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uint16_t len;
uint16_t pos;
} mp_lexer_file_buf_t;
STATIC mp_uint_t file_buf_next_byte(mp_lexer_file_buf_t *fb) {
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if (fb->pos >= fb->len) {
if (fb->len < sizeof(fb->buf)) {
return MP_LEXER_EOF;
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} else {
UINT n;
f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
if (n == 0) {
return MP_LEXER_EOF;
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}
fb->len = n;
fb->pos = 0;
}
}
return fb->buf[fb->pos++];
}
STATIC void file_buf_close(mp_lexer_file_buf_t *fb) {
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f_close(&fb->fp);
m_del_obj(mp_lexer_file_buf_t, fb);
}
mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
mp_lexer_file_buf_t *fb = m_new_obj_maybe(mp_lexer_file_buf_t);
if (fb == NULL) {
return NULL;
}
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FRESULT res = f_open(&fb->fp, filename, FA_READ);
if (res != FR_OK) {
m_del_obj(mp_lexer_file_buf_t, fb);
return NULL;
}
UINT n;
f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
fb->len = n;
fb->pos = 0;
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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}