4 * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 /* Initializes a buffer with a certain amount of allocated space */
32 ws_buffer_init(Buffer* buffer, gsize space)
34 buffer->data = (guint8*)g_malloc(space);
35 buffer->allocated = space;
37 buffer->first_free = 0;
40 /* Frees the memory used by a buffer */
42 ws_buffer_free(Buffer* buffer)
48 /* Assures that there are 'space' bytes at the end of the used space
49 so that another routine can copy directly into the buffer space. After
50 doing that, the routine will also want to run
51 ws_buffer_increase_length(). */
53 ws_buffer_assure_space(Buffer* buffer, gsize space)
55 gsize available_at_end = buffer->allocated - buffer->first_free;
57 gboolean space_at_beginning;
59 /* If we've got the space already, good! */
60 if (space <= available_at_end) {
64 /* Maybe we don't have the space available at the end, but we would
65 if we moved the used space back to the beginning of the
66 allocation. The buffer could have become fragmented through lots
67 of calls to ws_buffer_remove_start(). I'm using buffer->start as the
68 same as 'available_at_start' in this comparison. */
70 /* or maybe there's just no more room. */
72 space_at_beginning = buffer->start >= space;
73 if (space_at_beginning || buffer->start > 0) {
74 space_used = buffer->first_free - buffer->start;
75 /* this memory copy better be safe for overlapping memory regions! */
76 memmove(buffer->data, buffer->data + buffer->start, space_used);
78 buffer->first_free = space_used;
80 /*if (buffer->start >= space) {*/
81 if (space_at_beginning) {
85 /* We'll allocate more space */
86 buffer->allocated += space + 1024;
87 buffer->data = (guint8*)g_realloc(buffer->data, buffer->allocated);
91 ws_buffer_append(Buffer* buffer, guint8 *from, gsize bytes)
93 ws_buffer_assure_space(buffer, bytes);
94 memcpy(buffer->data + buffer->first_free, from, bytes);
95 buffer->first_free += bytes;
99 ws_buffer_remove_start(Buffer* buffer, gsize bytes)
101 if (buffer->start + bytes > buffer->first_free) {
102 g_error("ws_buffer_remove_start trying to remove %" G_GINT64_MODIFIER "u bytes. s=%" G_GINT64_MODIFIER "u ff=%" G_GINT64_MODIFIER "u!\n",
103 (guint64)bytes, (guint64)buffer->start,
104 (guint64)buffer->first_free);
105 /** g_error() does an abort() and thus never returns **/
107 buffer->start += bytes;
109 if (buffer->start == buffer->first_free) {
111 buffer->first_free = 0;
116 #ifndef SOME_FUNCTIONS_ARE_DEFINES
118 ws_buffer_clean(Buffer* buffer)
120 ws_buffer_remove_start(buffer, ws_buffer_length(buffer));
124 #ifndef SOME_FUNCTIONS_ARE_DEFINES
126 ws_buffer_increase_length(Buffer* buffer, gsize bytes)
128 buffer->first_free += bytes;
132 #ifndef SOME_FUNCTIONS_ARE_DEFINES
134 ws_buffer_length(Buffer* buffer)
136 return buffer->first_free - buffer->start;
140 #ifndef SOME_FUNCTIONS_ARE_DEFINES
142 ws_buffer_start_ptr(Buffer* buffer)
144 return buffer->data + buffer->start;
148 #ifndef SOME_FUNCTIONS_ARE_DEFINES
150 ws_buffer_end_ptr(Buffer* buffer)
152 return buffer->data + buffer->first_free;
156 #ifndef SOME_FUNCTIONS_ARE_DEFINES
158 ws_buffer_append_buffer(Buffer* buffer, Buffer* src_buffer)
160 ws_buffer_append(buffer, ws_buffer_start_ptr(src_buffer), ws_buffer_length(src_buffer));
165 * Editor modelines - http://www.wireshark.org/tools/modelines.html
170 * indent-tabs-mode: t
173 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
174 * :indentSize=8:tabSize=8:noTabs=false: