bird/proto/bmp/buffer.c

/*
 *	BIRD -- The BGP Monitoring Protocol (BMP)
 *
 *	(c) 2020 Akamai Technologies, Inc. (Pawel Maslanka, pmaslank@akamai.com)
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#include "proto/bmp/buffer.h"

buffer
bmp_buffer_alloc(pool *ppool, const size_t n)
{
  buffer buf;
  buf.start = mb_alloc(ppool, n);
  buf.pos = buf.start;
  buf.end = buf.start + n;

  return buf;
}

void
bmp_buffer_free(buffer *buf)
{
  mb_free(buf->start);
  buf->start = buf->pos = buf->end = NULL;
}

static void
bmp_buffer_grow(buffer *buf, const size_t n)
{
  const size_t pos = bmp_buffer_pos(buf);
  buf->start = mb_realloc(buf->start, n);
  buf->pos = buf->start + pos;
  buf->end = buf->start + n;
}

void
bmp_buffer_need(buffer *buf, const size_t n)
{
  if (bmp_buffer_avail(buf) < n)
  {
    bmp_buffer_grow(buf, n);
  }
}

void
bmp_put_data(buffer *buf, const void *src, const size_t n)
{
  if (!n)
  {
    return;
  }

  bmp_buffer_need(buf, n);
  memcpy(buf->pos, src, n);
  buf->pos += n;
}