libctf: add SHA-1 support for libctf

This very thin abstraction layer provides SHA-1ing facilities to all of
libctf, almost all inlined wrappers around the libiberty functionality
other than ctf_sha1_fini.

The deduplicator will use this to recursively hash types to prove their
identity.

libctf/
	* ctf-sha1.h: New, inline wrappers around sha1_init_ctx and
	sha1_process_bytes.
	* ctf-impl.h: Include it.
	(ctf_sha1_init): New.
	(ctf_sha1_add): Likewise.
	(ctf_sha1_fini): Likewise.
	* ctf-sha1.c: New, non-inline wrapper around sha1_finish_ctx
	producing strings.
	* Makefile.am: Add file.
	* Makefile.in: Regenerate.

1 files changed, 41 insertions, 0 deletions

diff --git a/libctf/ctf-sha1.h b/libctf/ctf-sha1.h
new file mode 100644
index 0000000..b9e0c9e
--- /dev/null
+++ b/libctf/ctf-sha1.h
@@ -0,0 +1,41 @@
+/* SHA-1 thunks.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of libctf.
+
+   libctf 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, 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; see the file COPYING.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _CTF_SHA1_H
+#define _CTF_SHA1_H
+
+#include "config.h"
+#include "sha1.h"
+
+#define CTF_SHA1_SIZE 41
+
+typedef struct sha1_ctx ctf_sha1_t;
+
+static inline void
+ctf_sha1_init (ctf_sha1_t *sha1)
+{
+  sha1_init_ctx (sha1);
+}
+
+static inline void
+ctf_sha1_add (ctf_sha1_t *sha1, const void *buf, size_t len)
+{
+  sha1_process_bytes (buf, len, sha1);
+}
+#endif