140 lines
4.8 KiB
C
140 lines
4.8 KiB
C
/**
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* \file lwrb.h
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* \brief LwRB - Lightweight ring buffer
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*/
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/*
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* Copyright (c) 2020 Tilen MAJERLE
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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* AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* This file is part of LwRB - Lightweight ring buffer library.
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*
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* Author: Tilen MAJERLE <tilen@majerle.eu>
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* Version: v2.0.3
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*/
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#ifndef LWRB_HDR_H
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#define LWRB_HDR_H
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#include <string.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* \defgroup LWRB Lightweight ring buffer manager
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* \brief Lightweight ring buffer manager
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* \{
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*/
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/**
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* \brief Enable buffer structure pointer parameters as volatile
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* To use this feature, uncomment keyword below, or define in global compiler settings
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*/
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#ifndef LWRB_VOLATILE
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#define LWRB_VOLATILE /* volatile */
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#endif
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/**
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* \brief Adds 2 magic words to make sure if memory is corrupted
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* application can detect wrong data pointer and maximum size
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*/
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#ifndef LWRB_USE_MAGIC
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#define LWRB_USE_MAGIC 1
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#endif
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/**
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* \brief Event type for buffer operations
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*/
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typedef enum {
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LWRB_EVT_READ, /*!< Read event */
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LWRB_EVT_WRITE, /*!< Write event */
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LWRB_EVT_RESET, /*!< Reset event */
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} lwrb_evt_type_t;
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/**
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* \brief Buffer structure forward declaration
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*/
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struct lwrb;
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/**
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* \brief Event callback function type
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* \param[in] buff: Buffer handle for event
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* \param[in] evt: Event type
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* \param[in] bp: Number of bytes written or read (when used), depends on event type
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*/
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typedef void (*lwrb_evt_fn)(struct lwrb* buff, lwrb_evt_type_t evt, size_t bp);
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/**
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* \brief Buffer structure
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*/
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typedef struct lwrb {
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#if LWRB_USE_MAGIC
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uint32_t magic1; /*!< Magic 1 word */
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#endif /* LWRB_USE_MAGIC */
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uint8_t* buff; /*!< Pointer to buffer data.
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Buffer is considered initialized when `buff != NULL` and `size > 0` */
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LWRB_VOLATILE size_t size; /*!< Size of buffer data. Size of actual buffer is `1` byte less than value holds */
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LWRB_VOLATILE size_t r; /*!< Next read pointer. Buffer is considered empty when `r == w` and full when `w == r - 1` */
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LWRB_VOLATILE size_t w; /*!< Next write pointer. Buffer is considered empty when `r == w` and full when `w == r - 1` */
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lwrb_evt_fn evt_fn; /*!< Pointer to event callback function */
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#if LWRB_USE_MAGIC
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uint32_t magic2; /*!< Magic 2 word */
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#endif /* LWRB_USE_MAGIC */
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} lwrb_t;
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uint8_t lwrb_init(lwrb_t* buff, void* buffdata, size_t size);
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uint8_t lwrb_is_ready(lwrb_t* buff);
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void lwrb_free(lwrb_t* buff);
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void lwrb_reset(lwrb_t* buff);
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void lwrb_set_evt_fn(lwrb_t* buff, lwrb_evt_fn fn);
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/* Read/Write functions */
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size_t lwrb_write(lwrb_t* buff, const void* data, size_t btw);
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size_t lwrb_read(lwrb_t* buff, void* data, size_t btr);
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size_t lwrb_peek(lwrb_t* buff, size_t skip_count, void* data, size_t btp);
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/* Buffer size information */
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size_t lwrb_get_free(lwrb_t* buff);
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size_t lwrb_get_full(lwrb_t* buff);
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/* Read data block management */
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void* lwrb_get_linear_block_read_address(lwrb_t* buff);
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size_t lwrb_get_linear_block_read_length(lwrb_t* buff);
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size_t lwrb_skip(lwrb_t* buff, size_t len);
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/* Write data block management */
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void* lwrb_get_linear_block_write_address(lwrb_t* buff);
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size_t lwrb_get_linear_block_write_length(lwrb_t* buff);
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size_t lwrb_advance(lwrb_t* buff, size_t len);
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/**
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* \}
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*/
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* LWRB_HDR_H */
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