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diff --git a/src/libpspp/legacy-encoding.h b/src/libpspp/legacy-encoding.h
new file mode 100644
index 00000000..8cb8cce9
--- /dev/null
+++ b/src/libpspp/legacy-encoding.h
@@ -0,0 +1,49 @@
+/* PSPP - computes sample statistics.
+   Copyright (C) 2006 Free Software Foundation, Inc.
+   Written by Ben Pfaff <blp@gnu.org>.
+
+   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., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
+
+#ifndef LIBPSPP_LEGACY_ENCODING
+#define LIBPSPP_LEGACY_ENCODING 1
+
+#include <stddef.h>
+#include <libpspp/compiler.h>
+
+/* A legacy character encoding.
+   This exists only to handle the specific legacy EBCDIC-to-ASCII
+   recoding that MODE=360 file handles perform. */
+enum legacy_encoding
+  {
+    LEGACY_ASCII,         /* ASCII or similar character set. */
+    LEGACY_EBCDIC,        /* IBM EBCDIC character set. */
+
+    /* Native character set. */
+#if 'A' == 0x41
+    LEGACY_NATIVE = LEGACY_ASCII
+#elif 'A' == 0xc1
+    LEGACY_NATIVE = LEGACY_EBCDIC
+#else
+#error Cannot detect native character set.
+#endif
+  };
+
+void legacy_recode (enum legacy_encoding, const char *src,
+                    enum legacy_encoding, char *dst, size_t);
+char legacy_to_native (enum legacy_encoding from, char) PURE_FUNCTION;
+char legacy_from_native (enum legacy_encoding to, char) PURE_FUNCTION;
+
+#endif /* libpspp/legacy-encoding.h */