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/*

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/

#ifndef _Xct_h
#define _Xct_h

#include <X11/Xfuncproto.h>

#define XctVersion 1

typedef unsigned char *XctString;

typedef enum {
    XctUnspecified,
    XctLeftToRight,
    XctRightToLeft
} XctHDirection;

typedef unsigned long XctFlags;

/* These are bits in XctFlags. */

#define XctSingleSetSegments	0x0001
   /* This means that returned segments should contain characters from only
    * one set (C0, C1, GL, GR).  When this is requested, XctSegment is never
    * returned, instead XctC0Segment, XctC1Segment, XctGlSegment, and
    * XctGRSegment are returned.  C0 and C1 segments are always returned as
    * singleton characters.
    */

#define XctProvideExtensions	0x0002
   /* This means that if the Compound Text string is from a higher version
    * than this code is implemented to, then syntactically correct but unknown
    * control sequences should be returned as XctExtension items.  If this
    * flag is not set, and the Compound Text string version indicates that
    * extensions cannot be ignored, then each unknown control sequence will be
    * reported as an XctError.
    */

#define XctAcceptC0Extensions	0x0004
   /* This means that if the Compound Text string is from a higher version
    * than this code is implemented to, then unknown C0 characters should be
    * treated as if they were legal, and returned as C0 characters (regardless
    * of how XctProvideExtensions is set).  If this flag is not set, then all
    * unknown C0 characters are treated according to XctProvideExtensions.
    */

#define XctAcceptC1Extensions	0x0008
   /* This means that if the Compound Text string is from a higher version
    * than this code is implemented to, then unknown C0 characters should be
    * treated as if they were legal, and returned as C0 characters (regardless
    * of how XctProvideExtensions is set).  If this flag is not set, then all
    * unknown C0 characters are treated according to XctProvideExtensions.
    */

#define XctHideDirection	0x0010
   /* This means that horizontal direction changes should be reported as
    * XctHorizontal items.  If this flag is not set, then direction changes are
    * not returned as items, but the current direction is still maintained and
    * reported for other items.
    */

#define XctFreeString		0x0020
   /* This means that XctFree should free the Compound Text string (that was
    * passed to XctCreate.  If this flag is not set, the string is not freed.
    */

#define XctShiftMultiGRToGL	0x0040
   /* Translate GR segments on-the-fly into GL segments for the GR sets:
    * GB2312.1980-1, JISX0208.1983-1, and KSC5601.1987-1.
    */

/* This is the return type for XctNextItem. */
typedef enum {
    XctSegment,		/* used when XctSingleSetSegments is not requested */
    XctC0Segment,	/* used when XctSingleSetSegments is requested */
    XctGLSegment,	/* used when XctSingleSetSegments is requested */
    XctC1Segment,	/* used when XctSingleSetSegments is requested */
    XctGRSegment,	/* used when XctSingleSetSegments is requested */
    XctExtendedSegment,	/* an extended segment */
    XctExtension,	/* used when XctProvideExtensions is requested */
    XctHorizontal,	/* horizontal direction or depth change */
    XctEndOfText,	/* end of text string */
    XctError		/* syntactic or semantic error */
} XctResult;

typedef struct _XctRec {
    XctString		total_string;	/* as given to XctCreate */
    int			total_length;	/* as given to XctCreate */
    XctFlags		flags;		/* as given to XctCreate */
    int			version;	/* indicates the version of the CT spec
					 * the string was produced from */
    int			can_ignore_exts;/* non-zero if ignoring extensions is
					 * acceptable, else zero */
    XctString		item;		/* item returned from XctNextItem */
    unsigned		item_length;	/* length of item in bytes */
    int			char_size;	/* number of bytes per character in
					 * item, with zero meaning variable */
    char		*encoding;	/* Encoding name for item */
    XctHDirection	horizontal;	/* direction of item */
    unsigned		horz_depth;	/* current direction nesting depth */
    char		*GL;		/* "{I} F" string for current GL */
    char		*GL_encoding;	/* Encoding name for current GL */
    int			GL_set_size;	/* 94 or 96 */
    int			GL_char_size;	/* number of bytes per GL character */
    char		*GR;		/* "{I} F" string for current GR */
    char		*GR_encoding;	/* Encoding name for current GR */
    int			GR_set_size;	/* 94 or 96 */
    int			GR_char_size;	/* number of bytes per GR character */
    char		*GLGR_encoding;	/* Encoding name for current GL+GR,
					 * if known */
    struct _XctPriv	*priv;		/* private to parser, don't peek */
} *XctData;

/* these are the external routines */
_XFUNCPROTOBEGIN

XctData XctCreate
(
 _Xconst unsigned char	*string,
 int			length,
 XctFlags		flags
);

XctResult XctNextItem
(
 XctData		data
);

void XctFree
(
 XctData		data
 );

void XctReset
(
 XctData		data
 );

_XFUNCPROTOEND

#endif /* _Xct_h */