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+/* $OpenLDAP$ */
+/* 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>.
+ */
+/* Copyright 1999 Computing Research Labs, New Mexico State University
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+/* $Id: ucpgba.h,v 1.4 1999/11/19 15:24:30 mleisher Exp $ */
+
+#ifndef _h_ucpgba
+#define _h_ucpgba
+
+#include "portable.h"
+
+LDAP_BEGIN_DECL
+
+/***************************************************************************
+ *
+ * Macros and types.
+ *
+ ***************************************************************************/
+
+/*
+ * These are the direction values that can appear in render runs and render
+ * strings.
+ */
+#define UCPGBA_LTR 0
+#define UCPGBA_RTL 1
+
+/*
+ * These are the flags for cursor motion.
+ */
+#define UCPGBA_CURSOR_VISUAL 0
+#define UCPGBA_CURSOR_LOGICAL 1
+
+/*
+ * This structure is used to contain runs of text in a particular direction.
+ */
+typedef struct _ucrun_t {
+ struct _ucrun_t *visual_prev; /* Pointer to the previous visual run. */
+ struct _ucrun_t *visual_next; /* Pointer to the next visual run. */
+
+ struct _ucrun_t *logical_prev; /* Pointer to the previous logical run. */
+ struct _ucrun_t *logical_next; /* Pointer to the next logical run. */
+
+ int direction; /* Direction of the run. */
+
+ long cursor; /* Position of "cursor" in the string. */
+
+ unsigned long *chars; /* List of characters for the run. */
+ unsigned long *positions; /* List of original positions in source. */
+
+ unsigned long *source; /* The source string. */
+ unsigned long start; /* Beginning offset in the source string. */
+ unsigned long end; /* Ending offset in the source string. */
+} ucrun_t;
+
+/*
+ * This represents a string of runs rendered up to a point that is not
+ * platform specific.
+ */
+typedef struct _ucstring_t {
+ int direction; /* Overall direction of the string. */
+
+ int cursor_motion; /* Logical or visual cursor motion flag. */
+
+ ucrun_t *cursor; /* The run containing the "cursor." */
+
+ ucrun_t *logical_first; /* First run in the logical order. */
+ ucrun_t *logical_last; /* Last run in the logical order. */
+
+ ucrun_t *visual_first; /* First run in the visual order. */
+ ucrun_t *visual_last; /* Last run in the visual order. */
+
+ unsigned long *source; /* The source string. */
+ unsigned long start; /* The beginning offset in the source. */
+ unsigned long end; /* The ending offset in the source. */
+} ucstring_t;
+
+/***************************************************************************
+ *
+ * API
+ *
+ ***************************************************************************/
+
+/*
+ * This creates and reorders the specified substring using the
+ * "Pretty Good Bidi Algorithm." A default direction is provided for cases
+ * of a string containing no strong direction characters and the default
+ * cursor motion should be provided.
+ */
+LDAP_LUNICODE_F (ucstring_t *)
+ucstring_create LDAP_P((unsigned long *source,
+ unsigned long start,
+ unsigned long end,
+ int default_direction,
+ int cursor_motion));
+/*
+ * This releases the string.
+ */
+LDAP_LUNICODE_F (void) ucstring_free LDAP_P((ucstring_t *string));
+
+/*
+ * This changes the cursor motion flag for the string.
+ */
+LDAP_LUNICODE_F (int)
+ucstring_set_cursor_motion LDAP_P((ucstring_t *string,
+ int cursor_motion));
+
+/*
+ * This function will move the cursor to the right depending on the
+ * type of cursor motion that was specified for the string.
+ *
+ * A 0 is returned if no cursor motion is performed, otherwise a
+ * 1 is returned.
+ */
+LDAP_LUNICODE_F (int)
+ucstring_cursor_right LDAP_P((ucstring_t *string, int count));
+
+/*
+ * This function will move the cursor to the left depending on the
+ * type of cursor motion that was specified for the string.
+ *
+ * A 0 is returned if no cursor motion is performed, otherwise a
+ * 1 is returned.
+ */
+LDAP_LUNICODE_F (int)
+ucstring_cursor_left LDAP_P((ucstring_t *string, int count));
+
+/*
+ * This routine retrieves the direction of the run containing the cursor
+ * and the actual position in the original text string.
+ */
+LDAP_LUNICODE_F (void)
+ucstring_cursor_info LDAP_P((ucstring_t *string, int *direction,
+ unsigned long *position));
+
+LDAP_END_DECL
+
+#endif /* _h_ucpgba */