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https://github.com/neocturne/fastd.git
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Matthias Schiffer
ba0f616acc
We need a total of 3 buffers: - Input buffer - Output buffer - Duplicated buffer for broadcast forward
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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Copyright (c) 2012-2016, Matthias Schiffer <mschiffer@universe-factory.net>
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All rights reserved.
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*/
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/**
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\file
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Buffer management
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*/
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#define FASTD_BUFFER_COUNT 3
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#include "fastd.h"
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/** The pool of statically allocated buffers */
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static fastd_buffer_t *buffers = NULL;
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/** Initializes the buffer pool */
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void fastd_init_buffers(void) {
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size_t i;
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for (i = 0; i < FASTD_BUFFER_COUNT; i++) {
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fastd_buffer_t *buffer =
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fastd_alloc_aligned(sizeof(*buffer) + ctx.max_buffer, sizeof(fastd_block128_t));
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fastd_buffer_free(buffer);
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}
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}
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/** Frees the buffer pool */
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void fastd_cleanup_buffers(void) {
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size_t i;
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for (i = 0; i < FASTD_BUFFER_COUNT; i++)
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free(fastd_buffer_alloc(0, 0));
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if (buffers)
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exit_bug("too many buffers to free");
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}
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/**
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Allocates a new buffer from the buffer pool
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A buffer can have headspace which allows changing the data pointer without moving the data.
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The buffer is always allocated aligned to 16 bytes to allow efficient access for SIMD instructions
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etc. in crypto implementations
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*/
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fastd_buffer_t *fastd_buffer_alloc(size_t len, size_t headroom) {
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size_t base_len = alignto(headroom + len, sizeof(fastd_block128_t));
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if (base_len > ctx.max_buffer)
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exit_fatal("BUG: oversized buffer alloc (%Z > %Z)", base_len, ctx.max_buffer);
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fastd_buffer_t *buffer = buffers;
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if (!buffer)
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exit_bug("out of buffers");
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if (buffer->len != SIZE_MAX)
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exit_bug("dirty freed buffer");
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buffers = buffer->data;
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buffer->data = buffer->base + headroom;
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buffer->len = len;
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return buffer;
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}
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/** Returns a buffer to the buffer pool */
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void fastd_buffer_free(fastd_buffer_t *buffer) {
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buffer->len = SIZE_MAX;
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buffer->data = buffers;
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buffers = buffer;
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}
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