Imported Upstream version 93u+upstream

1 files changed, 60 insertions, 0 deletions

diff --git a/src/lib/libsum/sum-att.c b/src/lib/libsum/sum-att.c
new file mode 100644
index 0000000..eb4b44c
--- /dev/null
+++ b/src/lib/libsum/sum-att.c
@@ -0,0 +1,60 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1996-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+
+/*
+ * att
+ */
+
+#define att_description	\
+	"The system 5 release 4 checksum. This is the default for \bsum\b \
+	when \bgetconf UNIVERSE\b is \batt\b. This is the only true sum; \
+	all of the other methods are order dependent."
+#define att_options	0
+#define att_match	"att|sys5|s5|default"
+#define att_open	long_open
+#define att_init	long_init
+#define att_print	long_print
+#define att_data	long_data
+#define att_scale	512
+
+static int
+att_block(register Sum_t* p, const void* s, size_t n)
+{
+	register uint32_t	c = ((Integral_t*)p)->sum;
+	register unsigned char*	b = (unsigned char*)s;
+	register unsigned char*	e = b + n;
+
+	while (b < e)
+		c += *b++;
+	((Integral_t*)p)->sum = c;
+	return 0;
+}
+
+static int
+att_done(Sum_t* p)
+{
+	register uint32_t	c = ((Integral_t*)p)->sum;
+
+	c = (c & 0xffff) + ((c >> 16) & 0xffff);
+	c = (c & 0xffff) + (c >> 16);
+	((Integral_t*)p)->sum = c & 0xffff;
+	return short_done(p);
+}