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authorBrad Bishop <bradleyb@us.ibm.com>2014-06-30 22:10:16 -0500
committerPatrick Williams <iawillia@us.ibm.com>2014-07-02 22:49:29 -0500
commitbf4630076762d9c20c16c80c1c791f352b046dd1 (patch)
treeefc67bad010a28fd1abf5aeeefda2a969514fd97 /clib/src/checksum.c
downloadffs-bf4630076762d9c20c16c80c1c791f352b046dd1.tar.gz
ffs-bf4630076762d9c20c16c80c1c791f352b046dd1.zip
Port FFS tools over from Building Block repository.
Diffstat (limited to 'clib/src/checksum.c')
-rw-r--r--clib/src/checksum.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/clib/src/checksum.c b/clib/src/checksum.c
new file mode 100644
index 0000000..fea96b4
--- /dev/null
+++ b/clib/src/checksum.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) International Business Machines Corp., 2014
+ *
+ * This program 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.
+ *
+ * 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. If not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "assert.h"
+#include "checksum.h"
+
+uint32_t memcpy_checksum(void *__restrict __dst, const void *__restrict __src,
+ size_t __n)
+{
+ uint8_t sum[4] = { 0, };
+
+ /* assert(((uintptr_t)__src & 3) == 0); */
+
+ size_t i;
+
+ if (__dst == NULL)
+ for (i = 0; i < __n; i++)
+ sum[i & 3] ^= ((uint8_t *) __src)[i];
+ else
+ for (i = 0; i < __n; i++)
+ sum[i & 3] ^= ((uint8_t *) __src)[i],
+ ((uint8_t *) __dst)[i] = ((uint8_t *) __src)[i];
+
+ return (sum[0] << 24) | (sum[1] << 16) | (sum[2] << 8) | sum[3];
+}
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