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/*
* active port forwarder - software for secure forwarding
* Copyright (C) 2003-2007 jeremian <jeremian [at] poczta.fm>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "header_buffer_struct.h"
/*
* Function name: HeaderBuffer_new
* Description: Create and initialize new HeaderBuffer structure.
* Returns: Pointer to newly created HeaderBuffer structure.
*/
HeaderBuffer*
HeaderBuffer_new()
{
HeaderBuffer* tmp = calloc(1, sizeof(HeaderBuffer));
assert(tmp != NULL);
if (tmp == NULL) {
return NULL;
}
return tmp;
}
/*
* Function name: HeaderBuffer_free
* Description: Free the memory allocated for HeaderBuffer structure.
* Arguments: hb - pointer to pointer to HeaderBuffer structure
*/
void
HeaderBuffer_free(HeaderBuffer** hb)
{
assert(hb != NULL);
if (hb == NULL) {
return;
}
assert((*hb) != NULL);
if ((*hb) == NULL) {
return;
}
free((*hb));
(*hb) = NULL;
}
/*
* Function name: HeaderBuffer_to_read
* Description: Evaluate how much bytes are needed to fill the header buffer.
* Arguments: hb - pointer to HeaderBuffer structure
* Returns: How much bytes are needed to fill the header buffer.
*/
int
HeaderBuffer_to_read(HeaderBuffer* hb)
{
assert(hb != NULL);
if (hb == NULL) {
return -1;
}
return (5 - hb->readed);
}
/*
* Function name: HeaderBuffer_store
* Description: Store readed part of the header in the buffer.
* Arguments: hb - pointer to HeaderBuffer structure
* buff - reader bytes
* n - how much bytes were readed
*/
void
HeaderBuffer_store(HeaderBuffer* hb, unsigned char* buff, int n)
{
assert(hb != NULL);
if (hb == NULL) {
return;
}
assert((hb->readed + n) <= 5);
if ((hb->readed + n) > 5) {
return;
}
assert(n > 0);
if (n <= 0) {
return;
}
memcpy(&hb->tab[hb->readed], buff, n);
hb->readed += n;
}
/*
* Function name: HeaderBuffer_restore
* Description: Restore the full header from the buffer. It's not checked, if the full header is in the buffer.
* Arguments: hb - pointer to HeaderBuffer structure
* buff - place to restore the full header to
*/
void
HeaderBuffer_restore(HeaderBuffer* hb, unsigned char* buff)
{
assert(hb != NULL);
if (hb == NULL) {
return;
}
memcpy(buff, hb->tab, 5);
hb->readed = 0;
}
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