/*
Copyright 1985, 1986, 1987, 1991, 1998  The Open Group

Portions Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.

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 OPEN GROUP OR SUN MICROSYSTEMS, INC. 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 EVEN IF
ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES.


Except as contained in this notice, the names of The Open Group and/or
Sun Microsystems, Inc. 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 and/or Sun Microsystems,
Inc., as applicable.


X Window System is a trademark of The Open Group

OSF/1, OSF/Motif and Motif are registered trademarks, and OSF, the OSF
logo, LBX, X Window System, and Xinerama are trademarks of the Open
Group. All other trademarks and registered trademarks mentioned herein
are the property of their respective owners. No right, title or
interest in or to any trademark, service mark, logo or trade name of
Sun Microsystems, Inc. or its licensors is granted.

*/
/******************************************************************

              Copyright 1991, 1992 by Fuji Xerox Co.,Ltd.

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, and that the name of Fuji Xerox Co.,Ltd.
not be used in advertising or publicity pertaining to distribution
of the software without specific, written prior permission.
Fuji Xerox Co.,Ltd. makes no representations about the suitability of
this software for any purpose.
It is provided "as is" without express or implied warranty.

FUJI XEROX CO.,LTD. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
IN NO EVENT SHALL FUJI XEROX CO.,LTD. BE LIABLE FOR ANY SPECIAL, INDIRECT
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH
THE USE OR PERFORMANCE OF THIS SOFTWARE.

  Auther: Kazunori Nishihara,  Fuji Xerox Co.,Ltd.
                               kaz@ssdev.ksp.fujixerox.co.jp

******************************************************************/
/*

Copyright (c) 1994  FUJITSU LIMITED

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 FUJITSU LIMITED 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 FUJITSU LIMITED 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 FUJITSU LIMITED.

  Auther  : Takashi Fujiwara   FUJITSU LIMITED 

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#define NEED_EVENTS
#include <X11/Xlibint.h>
#include <X11/Xutil.h>
#include "Xlcint.h"

#include "XimpIm.h"

/* 
 * lookup_string() is stolen from libX11: xc/lib/X11/imconv.c
 *
 * Rather than just call _XLookupString (i.e. the pre-XKB XLookupString) 
 * do this because with XKB the event may have some funky modifiers that 
 * _XLookupString doesn't grok.
 */
#include <X11/XKBlib.h>

static int lookup_string(
    XKeyEvent*		event,
    char*		buffer,
    int			nbytes,
    KeySym*		keysym,
    XComposeStatus*	status)
{
  int ret;

  unsigned ctrls = XkbGetXlibControls (event->display);
  XkbSetXlibControls (event->display, 
		      XkbLC_ForceLatin1Lookup, XkbLC_ForceLatin1Lookup);
  ret = XLookupString(event, (char *)buffer, nbytes, keysym, status);
  XkbSetXlibControls (event->display,
		      XkbLC_ForceLatin1Lookup, ctrls);

  return ret;
}

/* maps Cyrillic keysyms to 8859-5 */
static unsigned char cyrillic[128] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x80 - */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90 - */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0xf2, 0xf3, 0xf1, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xa0 - */
    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0x00, 0xfe, 0xff,
    0xf0, 0xa2, 0xa3, 0xa1, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xb0 - */
    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0x00, 0xae, 0xaf,
    0xee, 0xd0, 0xd1, 0xe6, 0xd4, 0xd5, 0xe4, 0xd3, /* 0xc0 - */
    0xe5, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde,
    0xdf, 0xef, 0xe0, 0xe1, 0xe2, 0xe3, 0xd6, 0xd2, /* 0xd0 - */
    0xec, 0xeb, 0xd7, 0xe8, 0xed, 0xe9, 0xe7, 0xea,
    0xce, 0xb0, 0xb1, 0xc6, 0xb4, 0xb5, 0xc4, 0xb3, /* 0xe0 - */
    0xc5, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe,
    0xbf, 0xcf, 0xc0, 0xc1, 0xc2, 0xc3, 0xb6, 0xb2, /* 0xf0 - */
    0xcc, 0xcb, 0xb7, 0xc8, 0xcd, 0xc9, 0xc7, 0xca
};

/* maps Greek keysyms to 8859-7 */
static unsigned char greek[128] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x80 - */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90 - */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0xb6, 0xb8, 0xb9, 0xba, 0xda, 0x00, 0xbc, /* 0xa0 - */
    0xbe, 0xdb, 0x00, 0xbf, 0x00, 0x00, 0xb5, 0xaf,
    0x00, 0xdc, 0xdd, 0xde, 0xdf, 0xfa, 0xc0, 0xfc, /* 0xb0 - */
    0xfd, 0xfb, 0xe0, 0xfe, 0x00, 0x00, 0x00, 0x00,
    0x00, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0 - */
    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
    0xd0, 0xd1, 0xd3, 0x00, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0 - */
    0xd8, 0xd9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0 - */
    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
    0xf0, 0xf1, 0xf3, 0xf2, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0 - */
    0xf8, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static unsigned char get_code(), get_greek(), get_cyril();

struct CodesetRec {
    unsigned long kset;
    char *designator;
    unsigned char (*char_code)();
};

static struct CodesetRec codeset[] = {
    {0x00l, "\033-A", get_code},  /* ISO 8859-1 (Latin 1) */
    {0x01l, "\033-B", get_code},  /* ISO 8859-2 (Latin 2) */
    {0x02l, "\033-C", get_code},  /* ISO 8859-3 (Latin 3) */
    {0x03l, "\033-D", get_code},  /* ISO 8859-4 (Latin 4) */
    {0x04l, "\033)I", get_code},  /* JIS x0201 (Katakana) */
    {0x05l, "\033-G", get_code},  /* ISO 8859-6 (Arabic) */
    {0x06l, "\033-L", get_cyril}, /* ISO 8859-5 (Cyrillic) */
    {0x07l, "\033-F", get_greek}, /* ISO 8859-7 (Greek) */
    {0x0cl, "\033-H", get_code},  /* ISO 8859-8 (Hebrew) */
};

static int codeset_size = sizeof(codeset) / sizeof(codeset[0]);

static int _XimConvertCharCode(
			       char *, int, KeySym, XlcConv
);

static unsigned char
get_code(keysym)
KeySym keysym;
{
    return((unsigned char)(keysym & 0xff));
}

static unsigned char
get_cyril(keysym)
KeySym keysym;
{
    return(cyrillic[keysym & 0x7f]);
}

static unsigned char
get_greek(keysym)
KeySym keysym;
{
    return(greek[keysym & 0x7f]);
}

#define BUF_SIZE (20)
static char local_buf[BUF_SIZE] = {0};	/* Clean up bss */
static unsigned char look[BUF_SIZE] = {0};	/* Clean up bss */

#ifndef MAXINT
#define MAXINT          (~((unsigned int)1 << (8 * sizeof(int)) - 1))
#endif /* !MAXINT */

Public int
_Ximp_ctstombs(xim, from, from_len, to, to_len, state)
    XIM		xim;
    char	*from;
    int		 from_len;
    char	*to;
    int		 to_len;
    Status	*state;
{
    Ximp_XIM	 im = (Ximp_XIM)xim;
    XlcConv	 conv = im->ximp_impart->ctom_conv;
    int		 from_left;
    int		 to_left;
    int		 from_savelen;
    int		 to_savelen;
    int		 from_cnvlen;
    int		 to_cnvlen;
    char	*from_buf;
    char	*to_buf, *tmp_buf;
    Status	 tmp_state;
  
    if (!state)
	state = &tmp_state;

    if (!conv || !from || !from_len) {
	*state = XLookupNone;
	return 0;
    }

    if (to && to_len) {
	from_left = from_len;
#ifdef sun
	to_left = to_len;
#else
	to_left = to_len - 1;
#endif
	from_cnvlen = 0;
	to_cnvlen = 0;
	for (;;) {
	    from_savelen = from_left;
	    to_savelen = to_left;
	    from_buf = &from[from_cnvlen];
	    to_buf = &to[to_cnvlen];
	    if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) < 0) {
		*state = XLookupNone;
		return 0;
	    }
	    from_cnvlen += (from_savelen - from_left);
	    to_cnvlen += (to_savelen - to_left);
	    if (from_left == 0) {
		if (to_cnvlen > 0) {
#ifndef sun
		    to[to_cnvlen] = '\0';
#endif
		    *state = XLookupChars;
		} else {
		    *state = XLookupNone;
		}
		return to_cnvlen;
	    }
	    if (to_left == 0)
		break;
	    /* Overflow : the to_left length is so small that it cannot 
	       accomodate the first mb character in the next conversion block */
	    if (to_left < MB_CUR_MAX)
	       break;
	}
    }

    from_left = from_len;
    from_cnvlen = 0;
    to_cnvlen = 0;
    /* BugId : 4253988. In case the from_buf is bigger than the to_buffer,
       we need to return the required buffer size and status as XBufferOverflow.       We create a tmp buffer equals 8 times the from_len and do conversion.
    */ 
    to_left = (8 * from_len) ;
    tmp_buf = (char *)malloc(to_left);
    for (;;) {
	from_savelen = from_left;
	from_buf = &from[from_cnvlen];
	to_savelen = to_left;
	to_buf = &tmp_buf[to_cnvlen];
	if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) < 0) {
	    *state = XLookupNone;
	    return 0;
	}
	from_cnvlen += (from_savelen - from_left);
	to_cnvlen += (to_savelen - to_left);
	if (from_left == 0) {
	    if (to_cnvlen > 0)
		*state = XBufferOverflow;
	    else
		*state = XLookupNone;
	    break;
	}
    }
    free(tmp_buf);
    return to_cnvlen;
}

Public int
_Ximp_ctstowcs(xim, from, from_len, to, to_len, state)
    XIM		xim;
    char	*from;
    int		 from_len;
    wchar_t	*to;
    int		 to_len;
    Status	*state;
{
    Ximp_XIM	 im = (Ximp_XIM)xim;
    XlcConv	 conv = im->ximp_impart->ctow_conv;
    int		 from_left;
    int		 to_left;
    int		 from_savelen;
    int		 to_savelen;
    int		 from_cnvlen;
    int		 to_cnvlen;
    char	*from_buf;
    wchar_t	*to_buf, *tmp_buf;
    Status	 tmp_state;

    if (!state)
	state = &tmp_state;

    if (!conv || !from || !from_len) {
	*state = XLookupNone;
	return 0;
    }

    if (to && to_len) {
	from_left = from_len;
#ifdef sun
	to_left = to_len;
#else
	to_left = to_len - 1;
#endif
	from_cnvlen = 0;
	to_cnvlen = 0;
	for (;;) {
	    from_savelen = from_left;
	    to_savelen = to_left;
	    from_buf = &from[from_cnvlen];
	    to_buf = &to[to_cnvlen];
	    if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) < 0) {
		*state = XLookupNone;
		return 0;
	    }
	    from_cnvlen += (from_savelen - from_left);
	    to_cnvlen += (to_savelen - to_left);
	    if (from_left == 0) {
		if (to_cnvlen > 0) {
#ifndef sun
		    to[to_cnvlen] = (wchar_t)'\0';
#endif
		    *state = XLookupChars;
		} else {
		    *state = XLookupNone;
		}
		return to_cnvlen;
	    }
	    if (to_left == 0)
		break;
	    /* Overflow : the to_left length is so small that it cannot 
	       accomodate the first mb character in the next conversion block */
	    if (to_left < sizeof(wchar_t)) {
		break;
	    }
	}
    }
		
    from_left = from_len;
    from_cnvlen = 0;
    to_cnvlen = 0;
    /* BugId : 4253988. In case the from_buf is bigger than the to_buffer,
       we need to return the required buffer size and status as XBufferOverflow.       We create a tmp buffer equals 8 times the from_len and do conversion.
    */ 
    to_left = (8 * from_len) ;
    tmp_buf = (wchar_t *)malloc(to_left * sizeof(wchar_t));
    for (;;) {
	from_savelen = from_left;
	from_buf = &from[from_cnvlen];
	to_savelen = to_left;
	to_buf = &tmp_buf[to_cnvlen];
	if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) < 0) {
	    *state = XLookupNone;
	    return 0;
	}
	from_cnvlen += (from_savelen - from_left);
	to_cnvlen += (MAXINT - to_left);
	if (from_left == 0) {
	    if (to_cnvlen > 0)
		*state = XBufferOverflow;
	    else
		*state = XLookupNone;
	    break;
	}
    }
    free(tmp_buf);
    return to_cnvlen;
}

Public int
_Ximp_mbs_charlen(im, mbstr, mbstr_len)
    Ximp_XIM 	 im;
    char	*mbstr;
    int		 mbstr_len;
{
    return mbstowcs(NULL, mbstr, mbstr_len); /* maybe evil */
}

Public int
_Ximp_LookupMBText(ic, event, buffer, nbytes, keysym, status)
    Ximp_XIC ic;
    XKeyEvent *event;
    unsigned char *buffer;
    int nbytes;
    KeySym *keysym;
    XComposeStatus *status;
{
    Ximp_XIM im = (Ximp_XIM)ic->core.im;
    int count;
    KeySym symbol;

    count = lookup_string(event, (char *)buffer,
			  nbytes, &symbol, status);
    if (keysym) *keysym = symbol;
    if ((nbytes == 0) || (symbol == NoSymbol)) {
	return(count);
    }
    if (count == 0) {
	count = _XimConvertCharCode((char *)buffer, nbytes, symbol,
						im->ximp_impart->ctom_conv);
    } else if ((count != 1) || (buffer[0] >= 0xa0)) { /* not ASCII Encoding */
	bcopy(buffer, look, count);
	if ((count = im->methods->ctstombs((XIM)im,
					   (char *)look, count,
					   (char *)buffer, nbytes,
					   NULL)) < 0) {
	    count = 0;
	}
    }
    return(count);
}

Private int
_XimctsConv(conv, from, from_len, to, to_len)
    XlcConv	 conv;
    char	*from;
    int		 from_len;
    char	*to;
    int		 to_len;
{
    int		 from_left;
    int		 to_left;
    int		 from_savelen;
    int		 to_savelen;
    int		 from_cnvlen;
    int		 to_cnvlen;
    char	*from_buf;
    char	*to_buf;

    if (!conv || !from || !from_len) {
	return 0;
    }

    if (to && to_len) {
	from_left = from_len;
	to_left = to_len - 1;
	from_cnvlen = 0;
	to_cnvlen = 0;
	for (;;) {
	    from_savelen = from_left;
	    to_savelen = to_left;
	    from_buf = &from[from_cnvlen];
	    to_buf = &to[to_cnvlen];
	    if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) != 0) {
		return 0;
	    }
	    from_cnvlen += (from_savelen - from_left);
	    to_cnvlen += (to_savelen - to_left);
	    if (from_left == 0) {
		if (to_cnvlen > 0) {
		    to[to_cnvlen] = '\0';
		}
		return to_cnvlen;
	    }
	    if (to_left == 0)
		break;
	}
    }

    from_left = from_len;
    from_cnvlen = 0;
    to_cnvlen = 0;
    to_buf = NULL;
    for (;;) {
	from_savelen = from_left;
	to_left = MAXINT;
	from_buf = &from[from_cnvlen];
	if (_XlcConvert(conv, (XPointer *)&from_buf, &from_left,
				 (XPointer *)&to_buf, &to_left, NULL, 0) < 0) {
	    return 0;
	}
	from_cnvlen += (from_savelen - from_left);
	to_cnvlen += (MAXINT - to_left);
	if (from_left == 0) {
	    break;
	}
    }
    return to_cnvlen;
}

Private int
_XimConvertCharCode(buffer, nbytes, symbol, conv)
    char *buffer;
    int nbytes;
    KeySym symbol;
    XlcConv conv;
{
    unsigned long kset;
    int count, local_count;
    struct CodesetRec *cset = (struct CodesetRec *)NULL;
    register int i;
    unsigned char c;

    count = 0;
    kset = (symbol >> 8) & 0xffffff;
    for (i = 0; i < codeset_size; i++) {
	if (kset == codeset[i].kset) {
	    cset = &codeset[i];
	    break;
	}
    }
    if ((cset) && (cset->char_code) && (c = (*cset->char_code)(symbol))) {
	strcpy(local_buf, cset->designator);
	local_count = strlen(cset->designator);
	local_buf[local_count] = c;
	local_count++;
	local_buf[local_count] = '\0';
	if ((count = _XimctsConv(conv,
		local_buf, local_count, (char *)buffer, nbytes)) < 0) {
	    count = 0;
	}
	if (count == 0) {
	    buffer[0] = c; buffer[1] = 0;
	    count = 1;
	}
    }
    return count;
}

Public int
_Ximp_LookupWCText(ic, event, buffer, nbytes, keysym, status)
    Ximp_XIC ic;
    XKeyEvent *event;
    wchar_t *buffer;
    int nbytes;
    KeySym *keysym;
    XComposeStatus *status;
{
    Ximp_XIM im = (Ximp_XIM)ic->core.im;
    int count;
    KeySym symbol;

    count = lookup_string(event, (char *)buffer, nbytes,
			  &symbol, status);
    if (keysym) *keysym = symbol;
    if ((nbytes == 0) || (symbol == NoSymbol)) {
	return(count);
    }
    if (count == 0) { /* Not ISO 8859-1 Encoding */
	count = _XimConvertCharCode((char *)buffer, nbytes, symbol,
						im->ximp_impart->ctow_conv);
    } else if ((count != 1) || (*(unsigned char *)buffer >= 0xa0)) { /* not ASCII Encoding */
	bcopy(buffer, look, count);
	if ((count = im->methods->ctstowcs((XIM)im,
					   (char *)look, count,
					   buffer, nbytes,
					   NULL)) < 0) {
	    count = 0;
	}
    }
    else { /* ASCII Encoding */
	buffer[0] = *(char *)buffer;
    }
    return(count);
}
