xref: /btstack/src/btstack_ring_buffer.h (revision bc37f7b0d0a3eaa5763a873c5730bc14b849aaa0)

/*
 * Copyright (C) 2016 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Please inquire about commercial licensing options at
 * [email protected]
 *
 */

/*
 *  btstack_ring_buffer.h
 */

#ifndef __BTSTACK_RING_BUFFER_H
#define __BTSTACK_RING_BUFFER_H

#if defined __cplusplus
extern "C" {
#endif

typedef struct btstack_ring_buffer {
    uint8_t  * storage;
    uint16_t size;
    uint16_t last_read_index;
    uint16_t last_written_index;
    uint8_t  full;
} btstack_ring_buffer_t;

// init ring buffer
void btstack_ring_buffer_init(btstack_ring_buffer_t * ring_buffer, uint8_t * storage, uint16_t storage_size);

// test if ring buffer is empty
int btstack_ring_buffer_empty(btstack_ring_buffer_t * ring_buffer);

// number of bytes available for read
int btstack_ring_buffer_bytes_available(btstack_ring_buffer_t * ring_buffer);

// free space for write given in number of bytes
int btstack_ring_buffer_bytes_free(btstack_ring_buffer_t * ring_buffer);

// add byte block to ring buffer,
int btstack_ring_buffer_write(btstack_ring_buffer_t * ring_buffer, uint8_t * data, uint16_t data_length);

// fetch data_length bytes from ring buffer
void btstack_ring_buffer_read(btstack_ring_buffer_t * ring_buffer, uint8_t * data, uint16_t data_length, uint16_t * number_of_bytes_read);


#if defined __cplusplus
}
#endif

#endif // __BTSTACK_RING_BUFFER_H