/*
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* BlueALSA - ffb.h
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* Copyright (c) 2016-2018 Arkadiusz Bokowy
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*
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* This file is a part of bluez-alsa.
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*
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* This project is licensed under the terms of the MIT license.
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*
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*/
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#ifndef BLUEALSA_SHARED_FFB_H_
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#define BLUEALSA_SHARED_FFB_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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* Convenience wrapper for FIFO-like buffer for uint8_t. */
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typedef struct {
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/* pointer to the allocated memory block */
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uint8_t *data;
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/* pointer to the end of data */
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uint8_t *tail;
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/* size of the buffer */
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size_t size;
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} ffb_uint8_t;
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/**
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* Convenience wrapper for FIFO-like buffer for int16_t. */
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typedef struct {
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int16_t *data;
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int16_t *tail;
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size_t size;
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} ffb_int16_t;
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/**
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* Allocate/reallocate resources for the FIFO-like buffer.
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*
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* @param p Pointer to the buffer structure.
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* @param s Number of the buffer unite blocks.
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* @return On success this function returns non-NULL value. */
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#define ffb_init(p, s) \
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((p)->data = (p)->tail = realloc((p)->data, ((p)->size = s) * sizeof(*(p)->data)))
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void ffb_uint8_free(ffb_uint8_t *ffb);
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void ffb_int16_free(ffb_int16_t *ffb);
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/**
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* Get number of unite blocks available for writing. */
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#define ffb_len_in(p) ((p)->size - ffb_len_out(p))
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/**
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* Get number of unite blocks available for reading. */
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#define ffb_len_out(p) ((size_t)((p)->tail - (p)->data))
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/**
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* Get number of bytes available for writing. */
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#define ffb_blen_in(p) (ffb_len_in(p) * sizeof(*(p)->data))
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/**
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* Get number of bytes available for reading. */
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#define ffb_blen_out(p) (ffb_len_out(p) * sizeof(*(p)->data))
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/**
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* Move the tail pointer by the given number of unite blocks. */
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#define ffb_seek(p, s) ((p)->tail += s)
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/**
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* Set the tail pointer to the beginning of the buffer. */
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#define ffb_rewind(p) ((p)->tail = (p)->data)
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/**
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* Shift data by the given number of unite blocks. */
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#define ffb_shift(p, s) do { \
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memmove((p)->data, (p)->data + (s), sizeof(*(p)->data) * (ffb_len_out(p) - (s))); \
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(p)->tail -= s; \
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} while (0)
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#endif
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