circuitpython/stmhal/bufhelper.c

/*
 * 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.
 */

#include "py/obj.h"
#include "bufhelper.h"

void pyb_buf_get_for_send(mp_obj_t o, mp_buffer_info_t *bufinfo, byte *tmp_data) {
    if (MP_OBJ_IS_INT(o)) {
        tmp_data[0] = mp_obj_get_int(o);
        bufinfo->buf = tmp_data;
        bufinfo->len = 1;
        bufinfo->typecode = 'B';
    } else {
        mp_get_buffer_raise(o, bufinfo, MP_BUFFER_READ);
    }
}

mp_obj_t pyb_buf_get_for_recv(mp_obj_t o, mp_buffer_info_t *bufinfo) {
    if (MP_OBJ_IS_INT(o)) {
        // allocate a new bytearray of given length
        bufinfo->len = mp_obj_get_int(o);
        bufinfo->typecode = 'B';
        return mp_obj_str_builder_start(&mp_type_bytes, bufinfo->len, (byte**)&bufinfo->buf);
    } else {
        // get the existing buffer
        mp_get_buffer_raise(o, bufinfo, MP_BUFFER_WRITE);
        return MP_OBJ_NULL;
    }
}