mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* mdfilter.c - filter data and calculate a message digest
|
|
* Copyright (c) 1997 by Werner Koch (dd9jn)
|
|
*
|
|
* This file is part of G10.
|
|
*
|
|
* G10 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.
|
|
*
|
|
* G10 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
|
|
#include "errors.h"
|
|
#include "iobuf.h"
|
|
#include "memory.h"
|
|
#include "util.h"
|
|
#include "filter.h"
|
|
|
|
|
|
|
|
/****************
|
|
* The filter is used to collect a message digest
|
|
*/
|
|
int
|
|
md_filter( void *opaque, int control,
|
|
IOBUF a, byte *buf, size_t *ret_len)
|
|
{
|
|
size_t size = *ret_len;
|
|
md_filter_context_t *mfx = opaque;
|
|
int i, c, rc=0;
|
|
|
|
if( control == IOBUFCTRL_UNDERFLOW ) {
|
|
if( mfx->maxbuf_size && size > mfx->maxbuf_size )
|
|
size = mfx->maxbuf_size;
|
|
for(i=0; i < size; i++ ) {
|
|
if( (c = iobuf_get(a)) == -1 )
|
|
break;
|
|
buf[i] = c;
|
|
}
|
|
|
|
if( i ) {
|
|
if( mfx->md5 )
|
|
md5_write(mfx->md5, buf, i );
|
|
if( mfx->rmd160 )
|
|
rmd160_write(mfx->rmd160, buf, i );
|
|
}
|
|
else
|
|
rc = -1; /* eof */
|
|
*ret_len = i;
|
|
}
|
|
else if( control == IOBUFCTRL_DESC )
|
|
*(char**)buf = "md_filter";
|
|
return rc;
|
|
}
|
|
|
|
|
|
void
|
|
free_md_filter_context( md_filter_context_t *mfx )
|
|
{
|
|
if( mfx->md5 )
|
|
md5_close(mfx->md5);
|
|
mfx->md5 = NULL;
|
|
if( mfx->rmd160 )
|
|
rmd160_close(mfx->rmd160);
|
|
mfx->rmd160 = NULL;
|
|
mfx->maxbuf_size = 0;
|
|
}
|
|
|