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vfs_reader.c

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  • vfs_reader.c 2.96 KiB
    /*
     * This file is part of the MicroPython project, http://micropython.org/
     *
     * The MIT License (MIT)
     *
     * Copyright (c) 2013-2017 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.
     */
    
    #include <stdio.h>
    #include <string.h>
    
    #include "py/runtime.h"
    #include "py/stream.h"
    #include "py/reader.h"
    #include "extmod/vfs.h"
    
    #if MICROPY_READER_VFS
    
    typedef struct _mp_reader_vfs_t {
        mp_obj_t file;
        uint16_t len;
        uint16_t pos;
        byte buf[24];
    } mp_reader_vfs_t;
    
    STATIC mp_uint_t mp_reader_vfs_readbyte(void *data) {
        mp_reader_vfs_t *reader = (mp_reader_vfs_t*)data;
        if (reader->pos >= reader->len) {
            if (reader->len < sizeof(reader->buf)) {
                return MP_READER_EOF;
            } else {
                int errcode;
                reader->len = mp_stream_rw(reader->file, reader->buf, sizeof(reader->buf),
                    &errcode, MP_STREAM_RW_READ | MP_STREAM_RW_ONCE);
                if (errcode != 0) {
                    // TODO handle errors properly
                    return MP_READER_EOF;
                }
                if (reader->len == 0) {
                    return MP_READER_EOF;
                }
                reader->pos = 0;
            }
        }
        return reader->buf[reader->pos++];
    }
    
    STATIC void mp_reader_vfs_close(void *data) {
        mp_reader_vfs_t *reader = (mp_reader_vfs_t*)data;
        mp_stream_close(reader->file);
        m_del_obj(mp_reader_vfs_t, reader);
    }
    
    void mp_reader_new_file(mp_reader_t *reader, const char *filename) {
        mp_reader_vfs_t *rf = m_new_obj(mp_reader_vfs_t);
        mp_obj_t arg = mp_obj_new_str(filename, strlen(filename));
        rf->file = mp_vfs_open(1, &arg, (mp_map_t*)&mp_const_empty_map);
        int errcode;
        rf->len = mp_stream_rw(rf->file, rf->buf, sizeof(rf->buf), &errcode, MP_STREAM_RW_READ | MP_STREAM_RW_ONCE);
        if (errcode != 0) {
            mp_raise_OSError(errcode);
        }
        rf->pos = 0;
        reader->data = rf;
        reader->readbyte = mp_reader_vfs_readbyte;
        reader->close = mp_reader_vfs_close;
    }
    
    #endif // MICROPY_READER_VFS