67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
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// SPDX-FileCopyrightText: Copyright (c) 2013-2017 Damien P. George
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//
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// SPDX-License-Identifier: MIT
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#include <stdio.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/reader.h"
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#include "extmod/vfs.h"
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#if MICROPY_READER_VFS
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typedef struct _mp_reader_vfs_t {
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mp_obj_t file;
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uint16_t len;
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uint16_t pos;
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byte buf[24];
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} mp_reader_vfs_t;
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STATIC mp_uint_t mp_reader_vfs_readbyte(void *data) {
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mp_reader_vfs_t *reader = (mp_reader_vfs_t *)data;
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if (reader->pos >= reader->len) {
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if (reader->len < sizeof(reader->buf)) {
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return MP_READER_EOF;
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} else {
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int errcode;
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reader->len = mp_stream_rw(reader->file, reader->buf, sizeof(reader->buf),
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&errcode, MP_STREAM_RW_READ | MP_STREAM_RW_ONCE);
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if (errcode != 0) {
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// TODO handle errors properly
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return MP_READER_EOF;
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}
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if (reader->len == 0) {
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return MP_READER_EOF;
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}
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reader->pos = 0;
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}
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}
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return reader->buf[reader->pos++];
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}
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STATIC void mp_reader_vfs_close(void *data) {
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mp_reader_vfs_t *reader = (mp_reader_vfs_t *)data;
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mp_stream_close(reader->file);
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m_del_obj(mp_reader_vfs_t, reader);
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}
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void mp_reader_new_file(mp_reader_t *reader, const char *filename) {
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mp_reader_vfs_t *rf = m_new_obj(mp_reader_vfs_t);
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mp_obj_t arg = mp_obj_new_str(filename, strlen(filename));
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rf->file = mp_vfs_open(1, &arg, (mp_map_t *)&mp_const_empty_map);
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int errcode;
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rf->len = mp_stream_rw(rf->file, rf->buf, sizeof(rf->buf), &errcode, MP_STREAM_RW_READ | MP_STREAM_RW_ONCE);
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if (errcode != 0) {
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mp_raise_OSError(errcode);
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}
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rf->pos = 0;
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reader->data = rf;
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reader->readbyte = mp_reader_vfs_readbyte;
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reader->close = mp_reader_vfs_close;
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}
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#endif // MICROPY_READER_VFS
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