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83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Mupen64plus-ui-console - circular_buffer.c *
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* Mupen64Plus homepage: https://mupen64plus.org/ *
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* Copyright (C) 2015 Bobby Smiles *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include <assert.h>
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#include <cstdlib>
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#include <cstring>
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#include "circular_buffer.hpp"
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int init_cbuff(struct circular_buffer* cbuff, size_t capacity)
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{
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void* data = malloc(capacity);
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if (data == nullptr)
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{
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return -1;
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}
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cbuff->data = data;
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cbuff->size = capacity;
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cbuff->head = 0;
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return 0;
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}
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void release_cbuff(struct circular_buffer* cbuff)
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{
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free(cbuff->data);
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memset(cbuff, 0, sizeof(*cbuff));
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}
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void* cbuff_head(const struct circular_buffer* cbuff, size_t* available)
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{
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assert(cbuff->head <= cbuff->size);
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*available = cbuff->size - cbuff->head;
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return (unsigned char*)cbuff->data + cbuff->head;
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}
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void* cbuff_tail(const struct circular_buffer* cbuff, size_t* available)
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{
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*available = cbuff->head;
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return cbuff->data;
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}
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void produce_cbuff_data(struct circular_buffer* cbuff, size_t amount)
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{
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assert(cbuff->head + amount <= cbuff->size);
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cbuff->head += amount;
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}
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void consume_cbuff_data(struct circular_buffer* cbuff, size_t amount)
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{
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assert(cbuff->head >= amount);
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memmove(cbuff->data, (unsigned char*)cbuff->data + amount, cbuff->head - amount);
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cbuff->head -= amount;
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}
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