kopia lustrzana https://github.com/micropython/micropython
111 wiersze
4.0 KiB
C
111 wiersze
4.0 KiB
C
/*
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* This file is part of the MicroPython 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) 2013-2017 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 <string.h>
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#include <stdlib.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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#ifndef MICROPY_READER_VFS_DEFAULT_BUFFER_SIZE
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#define MICROPY_READER_VFS_DEFAULT_BUFFER_SIZE (2 * MICROPY_BYTES_PER_GC_BLOCK - offsetof(mp_reader_vfs_t, buf))
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#endif
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#define MICROPY_READER_VFS_MIN_BUFFER_SIZE (MICROPY_BYTES_PER_GC_BLOCK - offsetof(mp_reader_vfs_t, buf))
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#define MICROPY_READER_VFS_MAX_BUFFER_SIZE (255)
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typedef struct _mp_reader_vfs_t {
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mp_obj_t file;
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uint8_t bufpos;
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uint8_t buflen;
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uint8_t bufsize;
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byte buf[];
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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->bufpos >= reader->buflen) {
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if (reader->buflen < reader->bufsize) {
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return MP_READER_EOF;
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} else {
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int errcode;
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reader->buflen = mp_stream_rw(reader->file, reader->buf, reader->bufsize, &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->buflen == 0) {
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return MP_READER_EOF;
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}
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reader->bufpos = 0;
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}
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}
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return reader->buf[reader->bufpos++];
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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, qstr filename) {
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mp_obj_t args[2] = {
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MP_OBJ_NEW_QSTR(filename),
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MP_OBJ_NEW_QSTR(MP_QSTR_rb),
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};
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mp_obj_t file = mp_vfs_open(MP_ARRAY_SIZE(args), &args[0], (mp_map_t *)&mp_const_empty_map);
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const mp_stream_p_t *stream_p = mp_get_stream(file);
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int errcode = 0;
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mp_uint_t bufsize = stream_p->ioctl(file, MP_STREAM_GET_BUFFER_SIZE, 0, &errcode);
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if (bufsize == MP_STREAM_ERROR || bufsize == 0) {
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// bufsize == 0 is included here to support mpremote v1.21 and older where mount file ioctl
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// returned 0 by default.
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bufsize = MICROPY_READER_VFS_DEFAULT_BUFFER_SIZE;
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} else {
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bufsize = MIN(MICROPY_READER_VFS_MAX_BUFFER_SIZE, MAX(MICROPY_READER_VFS_MIN_BUFFER_SIZE, bufsize));
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}
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mp_reader_vfs_t *rf = m_new_obj_var(mp_reader_vfs_t, buf, byte, bufsize);
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rf->file = file;
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rf->bufsize = bufsize;
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rf->buflen = mp_stream_rw(rf->file, rf->buf, rf->bufsize, &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->bufpos = 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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