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/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*/
#ifndef LIBISO_BUFFER_H_
#define LIBISO_BUFFER_H_
#include <stdlib.h>
#include <stdint.h>
#define BLOCK_SIZE 2048
typedef struct iso_ring_buffer IsoRingBuffer;
/**
* Create a new buffer.
*
* The created buffer should be freed with iso_ring_buffer_free()
*
* @param size
* Number of blocks in buffer. You should supply a number >= 32, otherwise
* size will be ignored and 32 will be used by default, which leads to a
* 64 KiB buffer.
* @return
* 1 success, < 0 error
*/
int iso_ring_buffer_new(size_t size, IsoRingBuffer **rbuf);
/**
* Free a given buffer
*/
void iso_ring_buffer_free(IsoRingBuffer *buf);
/**
* Write count bytes into buffer. It blocks until all bytes where written or
* reader close the buffer.
*
* @param buf
* the buffer
* @param data
* pointer to a memory region of at least coun bytes, from which data
* will be read.
* @param
* Number of bytes to write
* @return
* 1 succes, 0 read finished, < 0 error
*/
int iso_ring_buffer_write(IsoRingBuffer *buf, uint8_t *data, size_t count);
/**
* Read count bytes from the buffer into dest. It blocks until the desired
* bytes has been read. If the writer finishes before outputting enought
* bytes, 0 (EOF) is returned, the number of bytes already read remains
* unknown.
*
* @return
* 1 success, 0 EOF, < 0 error
*/
int iso_ring_buffer_read(IsoRingBuffer *buf, uint8_t *dest, size_t count);
/**
* Close the buffer (to be called by the writer).
* You have to explicity close the buffer when you don't have more data to
* write, otherwise reader will be waiting forever.
*
* @param error
* Writer has finished prematurely due to an error
*/
void iso_ring_buffer_writer_close(IsoRingBuffer *buf, int error);
/**
* Close the buffer (to be called by the reader).
* If for any reason you don't want to read more data, you need to call this
* to let the writer thread finish.
*
* @param error
* Reader has finished prematurely due to an error
*/
void iso_ring_buffer_reader_close(IsoRingBuffer *buf, int error);
/**
* Get the times the buffer was full.
*/
unsigned int iso_ring_buffer_get_times_full(IsoRingBuffer *buf);
/**
* Get the times the buffer was empty.
*/
unsigned int iso_ring_buffer_get_times_empty(IsoRingBuffer *buf);
#endif /*LIBISO_BUFFER_H_*/