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/*
* Copyright (C) 2009-2012 Free Software Foundation, Inc.
*
* Author: Jonathan Bastien-Filiatrault
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
#ifndef GNUTLS_MBUFFERS_H
#define GNUTLS_MBUFFERS_H
#include <gnutls_int.h>
#include <gnutls_errors.h>
void _mbuffer_head_init (mbuffer_head_st * buf);
void _mbuffer_head_clear (mbuffer_head_st * buf);
void _mbuffer_enqueue (mbuffer_head_st * buf, mbuffer_st * bufel);
mbuffer_st* _mbuffer_dequeue (mbuffer_head_st * buf, mbuffer_st * bufel);
int _mbuffer_head_remove_bytes (mbuffer_head_st * buf, size_t bytes);
mbuffer_st *_mbuffer_alloc (size_t payload_size, size_t maximum_size);
mbuffer_st *_mbuffer_head_get_first (mbuffer_head_st * buf, gnutls_datum_t * msg);
mbuffer_st *_mbuffer_head_get_next (mbuffer_st * cur, gnutls_datum_t * msg);
mbuffer_st *
_mbuffer_head_pop_first (mbuffer_head_st * buf);
/* This is dangerous since it will replace bufel with a new
* one.
*/
int _mbuffer_append_data (mbuffer_st * bufel, void *newdata,
size_t newdata_size);
int _mbuffer_linearize (mbuffer_head_st * buf);
/* For "user" use. One can have buffer data and header.
*/
inline static void
_mbuffer_set_udata (mbuffer_st * bufel, void *data, size_t data_size)
{
memcpy (bufel->msg.data + bufel->mark + bufel->uhead_mark, data, data_size);
bufel->msg.size = data_size + bufel->uhead_mark + bufel->mark;
}
inline static void *
_mbuffer_get_uhead_ptr (mbuffer_st * bufel)
{
return bufel->msg.data + bufel->mark;
}
inline static void *
_mbuffer_get_udata_ptr (mbuffer_st * bufel)
{
return bufel->msg.data + bufel->uhead_mark + bufel->mark;
}
inline static void
_mbuffer_set_udata_size (mbuffer_st * bufel, size_t size)
{
bufel->msg.size = size + bufel->uhead_mark + bufel->mark;
}
inline static size_t
_mbuffer_get_udata_size (mbuffer_st * bufel)
{
return bufel->msg.size - bufel->uhead_mark - bufel->mark;
}
/* discards size bytes from the begging of the buffer */
inline static void
_mbuffer_consume (mbuffer_head_st* buf, mbuffer_st * bufel, size_t size)
{
bufel->uhead_mark = 0;
if (bufel->mark+size < bufel->msg.size)
bufel->mark += size;
else
bufel->mark = bufel->msg.size;
buf->byte_length -= size;
}
inline static size_t
_mbuffer_get_uhead_size (mbuffer_st * bufel)
{
return bufel->uhead_mark;
}
inline static void
_mbuffer_set_uhead_size (mbuffer_st * bufel, size_t size)
{
bufel->uhead_mark = size;
}
inline static mbuffer_st *
_gnutls_handshake_alloc (gnutls_session_t session, size_t size, size_t maximum)
{
mbuffer_st *ret = _mbuffer_alloc (HANDSHAKE_HEADER_SIZE(session) + size,
HANDSHAKE_HEADER_SIZE(session) + maximum);
if (!ret)
return NULL;
_mbuffer_set_uhead_size (ret, HANDSHAKE_HEADER_SIZE(session));
return ret;
}
/* Free a segment, if the pointer is not NULL
*
* We take a ** to detect and fix double free bugs (the dangling
* pointer case). It also makes sure the pointer has a known value
* after freeing.
*/
inline static void
_mbuffer_xfree (mbuffer_st ** bufel)
{
if (*bufel)
gnutls_free (*bufel);
*bufel = NULL;
}
#endif
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