forked from osmocom/wireshark
8a8b883450
they have LF at the end of the line on UN*X and CR/LF on Windows; hopefully this means that if a CR/LF version is checked in on Windows, the CRs will be stripped so that they show up only when checked out on Windows, not on UN*X. svn path=/trunk/; revision=11400
140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/* buffer.c
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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 buffer_init(Buffer* buffer, unsigned int space)
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{
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buffer->data = (guchar*)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 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 buffer_assure_space(Buffer* buffer, unsigned int space)
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{
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unsigned int available_at_end = buffer->allocated - buffer->first_free;
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unsigned int space_used;
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int 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 = (guchar*)g_realloc(buffer->data, buffer->allocated);
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}
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void buffer_append(Buffer* buffer, guchar *from, unsigned int 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 buffer_remove_start(Buffer* buffer, unsigned int 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 %d bytes. s=%d ff=%d!\n",
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bytes, buffer->start, buffer->first_free);
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exit(1);
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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 buffer_increase_length(Buffer* buffer, unsigned int 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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unsigned int 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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guchar* 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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guchar* 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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