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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* mdfilter.c - filter data and calculate a message digest
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* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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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#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 <errno.h>
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#include <assert.h>
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#include <gcrypt.h>
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#include "errors.h"
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#include "iobuf.h"
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#include "util.h"
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#include "filter.h"
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/****************
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* This filter is used to collect a message digest
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*/
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int
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md_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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md_filter_context_t *mfx = opaque;
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int i, rc=0;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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if( mfx->maxbuf_size && size > mfx->maxbuf_size )
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size = mfx->maxbuf_size;
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i = iobuf_read( a, buf, size );
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if( i == -1 ) i = 0;
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if( i ) {
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gcry_md_write(mfx->md, buf, i );
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if( mfx->md2 )
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gcry_md_write(mfx->md2, buf, i );
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}
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else
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rc = -1; /* eof */
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*ret_len = i;
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}
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else if( control == IOBUFCTRL_DESC )
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*(char**)buf = "md_filter";
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return rc;
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}
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void
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free_md_filter_context( md_filter_context_t *mfx )
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{
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gcry_md_close(mfx->md);
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gcry_md_close(mfx->md2);
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mfx->md = NULL;
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mfx->md2 = NULL;
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mfx->maxbuf_size = 0;
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}
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