2 * Copyright (C) 2009-2012 Free Software Foundation, Inc.
4 * Author: Jonathan Bastien-Filiatrault
6 * This file is part of GNUTLS.
8 * The GNUTLS library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1 of
11 * the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>
23 #ifndef GNUTLS_MBUFFERS_H
24 #define GNUTLS_MBUFFERS_H
26 #include <gnutls_int.h>
27 #include <gnutls_errors.h>
29 void _mbuffer_head_init(mbuffer_head_st * buf);
30 void _mbuffer_head_clear(mbuffer_head_st * buf);
31 void _mbuffer_enqueue(mbuffer_head_st * buf, mbuffer_st * bufel);
32 mbuffer_st *_mbuffer_dequeue(mbuffer_head_st * buf, mbuffer_st * bufel);
33 int _mbuffer_head_remove_bytes(mbuffer_head_st * buf, size_t bytes);
34 mbuffer_st *_mbuffer_alloc(size_t maximum_size);
35 int _mbuffer_linearize(mbuffer_head_st * buf);
37 mbuffer_st *_mbuffer_head_get_first(mbuffer_head_st * buf,
38 gnutls_datum_t * msg);
39 mbuffer_st *_mbuffer_head_get_next(mbuffer_st * cur, gnutls_datum_t * msg);
41 mbuffer_st *_mbuffer_head_pop_first(mbuffer_head_st * buf);
43 /* This is dangerous since it will replace bufel with a new
46 int _mbuffer_append_data(mbuffer_st * bufel, void *newdata,
50 /* For "user" use. One can have buffer data and header.
53 inline static void *_mbuffer_get_uhead_ptr(mbuffer_st * bufel)
55 return bufel->msg.data + bufel->mark;
58 inline static void *_mbuffer_get_udata_ptr(mbuffer_st * bufel)
60 return bufel->msg.data + bufel->uhead_mark + bufel->mark;
63 inline static void _mbuffer_set_udata_size(mbuffer_st * bufel, size_t size)
65 bufel->msg.size = size + bufel->uhead_mark + bufel->mark;
69 _mbuffer_set_udata(mbuffer_st * bufel, void *data, size_t data_size)
71 memcpy(_mbuffer_get_udata_ptr(bufel), data,
73 _mbuffer_set_udata_size(bufel, data_size);
76 inline static size_t _mbuffer_get_udata_size(mbuffer_st * bufel)
78 return bufel->msg.size - bufel->uhead_mark - bufel->mark;
81 /* discards size bytes from the begging of the buffer */
83 _mbuffer_consume(mbuffer_head_st * buf, mbuffer_st * bufel, size_t size)
85 bufel->uhead_mark = 0;
86 if (bufel->mark + size < bufel->msg.size)
89 bufel->mark = bufel->msg.size;
91 buf->byte_length -= size;
94 inline static size_t _mbuffer_get_uhead_size(mbuffer_st * bufel)
96 return bufel->uhead_mark;
99 inline static void _mbuffer_set_uhead_size(mbuffer_st * bufel, size_t size)
101 bufel->uhead_mark = size;
106 inline static mbuffer_st *_gnutls_handshake_alloc(gnutls_session_t session,
110 _mbuffer_alloc(HANDSHAKE_HEADER_SIZE(session) + maximum);
115 _mbuffer_set_uhead_size(bufel, HANDSHAKE_HEADER_SIZE(session));
116 _mbuffer_set_udata_size(bufel, maximum);
121 /* Free a segment, if the pointer is not NULL
123 * We take a ** to detect and fix double free bugs (the dangling
124 * pointer case). It also makes sure the pointer has a known value
127 inline static void _mbuffer_xfree(mbuffer_st ** bufel)
135 #ifdef ENABLE_ALIGN16
136 mbuffer_st *_mbuffer_alloc_align16(size_t maximum_size, unsigned align_pos);
137 int _mbuffer_linearize_align16(mbuffer_head_st * buf, unsigned align_pos);
139 # define _mbuffer_alloc_align16(x,y) _mbuffer_alloc(x)
140 # define _mbuffer_linearize_align16(x,y) _mbuffer_linearize(x)