/*

  silcbufutil.h

  Author: Pekka Riikonen <priikone@poseidon.pspt.fi>

  Copyright (C) 1997 - 2000 Pekka Riikonen

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

*/

#ifndef SILCBUFUTIL_H
#define SILCBUFUTIL_H

#ifndef SILC_DEBUG		/* When we are not doing debugging we use
				   optimized inline buffer functions. */

/* Clears and initialiazes the buffer to the state as if it was just
   allocated by silc_buffer_alloc. */

extern inline
void silc_buffer_clear(SilcBuffer sb)
{
  memset(sb->head, 0, sb->truelen);
  sb->data = sb->head;
  sb->tail = sb->head;
  sb->len = 0;
}

/* Generates copy of a SilcBuffer. This copies everything inside the
   currently valid data area, nothing more. Use silc_buffer_clone to
   copy entire buffer. */

extern inline
SilcBuffer silc_buffer_copy(SilcBuffer sb)
{
  SilcBuffer sb_new;

  sb_new = silc_buffer_alloc(sb->len);
  silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
  silc_buffer_put(sb_new, sb->data, sb->len);

  return sb_new;
}

/* Clones SilcBuffer. This generates new SilcBuffer and copies
   everything from the source buffer. The result is exact clone of
   the original buffer. */

extern inline
SilcBuffer silc_buffer_clone(SilcBuffer sb)
{
  SilcBuffer sb_new;

  sb_new = silc_buffer_alloc(sb->truelen);
  silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
  silc_buffer_put(sb_new, sb->head, sb->truelen);
  sb_new->data = sb_new->head + sb->len;
  sb_new->tail = sb_new->head + (sb->end - sb->tail);
  sb_new->len = sb->len;

  return sb_new;
}

#endif /* !SILC_DEBUG */

/* Prototypes */
#ifdef SILC_DEBUG
void silc_buffer_clear(SilcBuffer sb);
SilcBuffer silc_buffer_copy(SilcBuffer sb);
SilcBuffer silc_buffer_clone(SilcBuffer sb);
#endif

#endif