Imported Upstream version 2.0.19upstream/2.0.19

1 files changed, 75 insertions, 0 deletions

diff --git a/g10/mdfilter.c b/g10/mdfilter.c
new file mode 100644
index 0000000..a005164
--- /dev/null
+++ b/g10/mdfilter.c
@@ -0,0 +1,75 @@
+/* mdfilter.c - filter data and calculate a message digest
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "gpg.h"
+#include "status.h"
+#include "iobuf.h"
+#include "util.h"
+#include "filter.h"
+
+
+
+/****************
+ * This 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, rc=0;
+
+    if( control == IOBUFCTRL_UNDERFLOW ) {
+	if( mfx->maxbuf_size && size > mfx->maxbuf_size )
+	    size = mfx->maxbuf_size;
+	i = iobuf_read( a, buf, size );
+	if( i == -1 ) i = 0;
+	if( i ) {
+	    gcry_md_write(mfx->md, buf, i );
+	    if( mfx->md2 )
+		gcry_md_write(mfx->md2, 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 )
+{
+    gcry_md_close(mfx->md);
+    gcry_md_close(mfx->md2);
+    mfx->md = NULL;
+    mfx->md2 = NULL;
+    mfx->maxbuf_size = 0;
+}
+