forked from osmocom/wireshark
![Alexis La Goutte](/assets/img/avatar_default.png)
(Using sed : sed -i '/^ \* \$Id\$/,+1 d') Fix manually some typo (in export_object_dicom.c and crc16-plain.c) Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8 Reviewed-on: https://code.wireshark.org/review/497 Reviewed-by: Anders Broman <a.broman58@gmail.com>
162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
/* buffer.c
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include "buffer.h"
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/* Initializes a buffer with a certain amount of allocated space */
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void
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buffer_init(Buffer* buffer, gsize space)
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{
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buffer->data = (guint8*)g_malloc(space);
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buffer->allocated = space;
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buffer->start = 0;
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buffer->first_free = 0;
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}
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/* Frees the memory used by a buffer, and the buffer struct */
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void
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buffer_free(Buffer* buffer)
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{
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g_free(buffer->data);
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}
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/* Assures that there are 'space' bytes at the end of the used space
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so that another routine can copy directly into the buffer space. After
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doing that, the routine will also want to run
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buffer_increase_length(). */
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void
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buffer_assure_space(Buffer* buffer, gsize space)
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{
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gsize available_at_end = buffer->allocated - buffer->first_free;
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gsize space_used;
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gboolean space_at_beginning;
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/* If we've got the space already, good! */
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if (space <= available_at_end) {
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return;
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}
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/* Maybe we don't have the space available at the end, but we would
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if we moved the used space back to the beginning of the
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allocation. The buffer could have become fragmented through lots
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of calls to buffer_remove_start(). I'm using buffer->start as the
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same as 'available_at_start' in this comparison. */
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/* or maybe there's just no more room. */
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space_at_beginning = buffer->start >= space;
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if (space_at_beginning || buffer->start > 0) {
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space_used = buffer->first_free - buffer->start;
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/* this memory copy better be safe for overlapping memory regions! */
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memmove(buffer->data, buffer->data + buffer->start, space_used);
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buffer->start = 0;
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buffer->first_free = space_used;
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}
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/*if (buffer->start >= space) {*/
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if (space_at_beginning) {
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return;
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}
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/* We'll allocate more space */
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buffer->allocated += space + 1024;
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buffer->data = (guint8*)g_realloc(buffer->data, buffer->allocated);
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}
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void
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buffer_append(Buffer* buffer, guint8 *from, gsize bytes)
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{
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buffer_assure_space(buffer, bytes);
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memcpy(buffer->data + buffer->first_free, from, bytes);
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buffer->first_free += bytes;
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}
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void
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buffer_remove_start(Buffer* buffer, gsize bytes)
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{
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if (buffer->start + bytes > buffer->first_free) {
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g_error("buffer_remove_start trying to remove %" G_GINT64_MODIFIER "u bytes. s=%" G_GINT64_MODIFIER "u ff=%" G_GINT64_MODIFIER "u!\n",
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(guint64)bytes, (guint64)buffer->start,
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(guint64)buffer->first_free);
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/** g_error() does an abort() and thus never returns **/
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}
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buffer->start += bytes;
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if (buffer->start == buffer->first_free) {
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buffer->start = 0;
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buffer->first_free = 0;
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}
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}
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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void
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buffer_clean(Buffer* buffer)
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{
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buffer_remove_start(buffer, buffer_length(buffer));
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}
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#endif
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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void
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buffer_increase_length(Buffer* buffer, gsize bytes)
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{
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buffer->first_free += bytes;
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}
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#endif
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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gsize
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buffer_length(Buffer* buffer)
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{
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return buffer->first_free - buffer->start;
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}
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#endif
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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guint8 *
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buffer_start_ptr(Buffer* buffer)
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{
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return buffer->data + buffer->start;
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}
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#endif
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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guint8 *
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buffer_end_ptr(Buffer* buffer)
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{
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return buffer->data + buffer->first_free;
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}
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#endif
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#ifndef SOME_FUNCTIONS_ARE_DEFINES
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void
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buffer_append_buffer(Buffer* buffer, Buffer* src_buffer)
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{
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buffer_append(buffer, buffer_start_ptr(src_buffer), buffer_length(src_buffer));
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}
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#endif
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