initially checkin

1 files changed, 70 insertions, 0 deletions

diff --git a/g10/mdfilter.c b/g10/mdfilter.c
new file mode 100644
index 000000000..b6cd86110
--- /dev/null
+++ b/g10/mdfilter.c
@@ -0,0 +1,70 @@
+/* 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( 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;
+}
+