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-rw-r--r--include/ac/bytes.h78
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diff --git a/include/ac/bytes.h b/include/ac/bytes.h
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+/* Generic bytes.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _AC_BYTES_H
+#define _AC_BYTES_H
+
+/* cross compilers should define both AC_INT{2,4}_TYPE in CPPFLAGS */
+
+#if !defined( AC_INT4_TYPE )
+ /* use autoconf defines to provide sized typedefs */
+# if SIZEOF_LONG == 4
+# define AC_INT4_TYPE long
+# elif SIZEOF_INT == 4
+# define AC_INT4_TYPE int
+# elif SIZEOF_SHORT == 4
+# define AC_INT4_TYPE short
+# else
+# error "AC_INT4_TYPE?"
+# endif
+#endif
+
+typedef AC_INT4_TYPE ac_int4;
+typedef signed AC_INT4_TYPE ac_sint4;
+typedef unsigned AC_INT4_TYPE ac_uint4;
+
+#if !defined( AC_INT2_TYPE )
+# if SIZEOF_SHORT == 2
+# define AC_INT2_TYPE short
+# elif SIZEOF_INT == 2
+# define AC_INT2_TYPE int
+# elif SIZEOF_LONG == 2
+# define AC_INT2_TYPE long
+# else
+# error "AC_INT2_TYPE?"
+# endif
+#endif
+
+#if defined( AC_INT2_TYPE )
+typedef AC_INT2_TYPE ac_int2;
+typedef signed AC_INT2_TYPE ac_sint2;
+typedef unsigned AC_INT2_TYPE ac_uint2;
+#endif
+
+#ifndef BYTE_ORDER
+/* cross compilers should define BYTE_ORDER in CPPFLAGS */
+
+/*
+ * Definitions for byte order, according to byte significance from low
+ * address to high.
+ */
+#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
+#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
+#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
+
+/* assume autoconf's AC_C_BIGENDIAN has been ran */
+/* if it hasn't, we assume (maybe falsely) the order is LITTLE ENDIAN */
+# ifdef WORDS_BIGENDIAN
+# define BYTE_ORDER BIG_ENDIAN
+# else
+# define BYTE_ORDER LITTLE_ENDIAN
+# endif
+
+#endif /* BYTE_ORDER */
+
+#endif /* _AC_BYTES_H */