Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 1375 insertions, 0 deletions

diff --git a/nx-X11/lib/X11/imThaiFlt.c b/nx-X11/lib/X11/imThaiFlt.c
new file mode 100644
index 000000000..18df0e1ff
--- /dev/null
+++ b/nx-X11/lib/X11/imThaiFlt.c
@@ -0,0 +1,1375 @@
+/* $Xorg: imThaiFlt.c,v 1.5 2001/02/09 02:03:39 xorgcvs Exp $ */
+/***********************************************************
+
+Copyright 1993, 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.
+
+
+Copyright 1993 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+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 Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL 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.
+
+******************************************************************/
+/* $XFree86: xc/lib/X11/imThaiFlt.c,v 3.22tsi Exp $ */
+
+/*
+**++ 
+**  FACILITY: 
+** 
+**      Xlib 
+** 
+**  ABSTRACT: 
+** 
+**	Thai specific functions.
+**	Handles character classifications, composibility checking,
+**	Input sequence check and other Thai specific requirements
+**	according to WTT specification and DEC extensions.
+** 
+**  MODIFICATION HISTORY: 
+** 
+**/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <X11/Xlib.h>
+#include <X11/Xmd.h>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>
+#include "Xlibint.h"
+#include "Xlcint.h"
+#include "Ximint.h"
+#include "XimThai.h"
+#include "XlcPubI.h"
+
+
+#define SPACE   32
+
+/* character classification table */
+#define TACTIS_CHARS 256
+Private
+char const tactis_chtype[TACTIS_CHARS] = {
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /*  0 -  7 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /*  8 - 15 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 16 - 23 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 24 - 31 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 32 - 39 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 40 - 47 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 48 - 55 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 56 - 63 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 64 - 71 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 72 - 79 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 80 - 87 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 88 - 95 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 96 - 103 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 104 - 111 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 112 - 119 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  CTRL,  /* 120 - 127 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 128 - 135 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 136 - 143 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 144 - 151 */
+    CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL,  /* 152 - 159 */
+    NON,  CONS, CONS, CONS, CONS, CONS, CONS, CONS,  /* 160 - 167 */
+    CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS,  /* 168 - 175 */
+    CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS,  /* 176 - 183 */
+    CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS,  /* 184 - 191 */
+    CONS, CONS, CONS, CONS,  FV3, CONS,  FV3, CONS,  /* 192 - 199 */
+    CONS, CONS, CONS, CONS, CONS, CONS, CONS, NON,   /* 200 - 207 */
+    FV1,  AV2,  FV1,  FV1,  AV1,  AV3,  AV2,  AV3,   /* 208 - 215 */
+    BV1,  BV2,  BD,   NON,  NON,  NON,  NON,  NON,   /* 216 - 223 */
+    LV,   LV,   LV,   LV,   LV,   FV2,  NON,  AD2,   /* 224 - 231 */
+    TONE, TONE, TONE, TONE, AD1,  AD1,  AD3,  NON,   /* 232 - 239 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  NON,   /* 240 - 247 */
+    NON,  NON,  NON,  NON,  NON,  NON,  NON,  CTRL   /* 248 - 255 */
+};
+
+/* Composibility checking tables */
+#define NC  0   /* NOT COMPOSIBLE - following char displays in next cell */
+#define CP  1   /* COMPOSIBLE - following char is displayed in the same cell
+                                as leading char, also implies ACCEPT */
+#define XC  3   /* Non-display */
+#define AC  4   /* ACCEPT - display the following char in the next cell */
+#define RJ  5   /* REJECT - discard that following char, ignore it */
+
+#define CH_CLASSES      17  /* 17 classes of chars */
+
+Private
+char const write_rules_lookup[CH_CLASSES][CH_CLASSES] = {
+        /* Table 0: writing/outputing rules */
+        /* row: leading char,  column: following char */
+/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */
+   {XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*CTRL*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*NON*/
+  ,{XC, NC, NC, NC, NC, NC, NC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*LV*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV1*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV2*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV3*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, CP, NC, NC, NC, NC, NC}/*BV1*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, NC, NC, NC, NC, NC}/*BV2*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*BD*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*TONE*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD1*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD2*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD3*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, CP, NC, NC, NC, NC, NC}/*AV1*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, NC, NC, NC, NC, NC}/*AV2*/
+  ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, CP, NC, NC, NC, NC}/*AV3*/
+};
+
+Private
+char const wtt_isc1_lookup[CH_CLASSES][CH_CLASSES] = {
+      /* Table 1: WTT default input sequence check rules */
+      /* row: leading char,  column: following char */
+/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */
+   {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/
+  ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV3*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*TONE*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/
+};
+
+Private
+char const wtt_isc2_lookup[CH_CLASSES][CH_CLASSES] = {
+      /* Table 2: WTT strict input sequence check rules */
+      /* row: leading char,  column: following char */
+/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */
+   {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/
+  ,{XC, AC, AC, AC, AC, RJ, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/
+  ,{XC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/
+  ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/
+  ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/
+  ,{XC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV3*/
+  ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*TONE*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD1*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD2*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/
+  ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/
+};
+
+Private
+char const thaicat_isc_lookup[CH_CLASSES][CH_CLASSES] = {
+      /* Table 3: Thaicat input sequence check rules */
+      /* row: leading char,  column: following char */
+/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */
+   {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/
+  ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ} /*FV3*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/
+  ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, RJ, RJ, RJ, RJ, RJ, CP, CP, CP}/*TONE*/
+  ,{XC, AC, AC, AC, AC, AC, AC, CP, RJ, RJ, RJ, RJ, RJ, RJ, CP, RJ, RJ}/*AD1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, CP}/*AD2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/
+  ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/
+};
+
+
+/* returns classification of a char */
+Private int
+THAI_chtype (unsigned char	ch)
+{
+    return tactis_chtype[ch];
+}
+
+#ifdef UNUSED
+/* returns the display level */
+Private int
+THAI_chlevel (unsigned char	ch)
+{
+    int     chlevel;
+
+    switch (tactis_chtype[ch])
+    {
+        case CTRL:
+            chlevel = NON;
+            break;
+        case BV1:
+        case BV2:
+        case BD:
+            chlevel = BELOW;
+            break;
+        case TONE:
+        case AD1:
+        case AD2:
+            chlevel = TOP;
+            break;
+        case AV1:
+        case AV2:
+        case AV3:
+        case AD3:
+            chlevel = ABOVE;
+            break;
+        case NON:
+        case CONS:
+        case LV:
+        case FV1:
+        case FV2:
+        case FV3:
+        default: /* if tactis_chtype is invalid */
+            chlevel = BASE;
+            break;
+    }
+    return chlevel;
+}
+
+
+/* return True if char is non-spacing */
+Private Bool
+THAI_isdead (unsigned char	ch)
+{
+    return ((tactis_chtype[ch] == CTRL) || (tactis_chtype[ch] == BV1) ||
+            (tactis_chtype[ch] == BV2)  || (tactis_chtype[ch] == BD)  ||
+            (tactis_chtype[ch] == TONE) || (tactis_chtype[ch] == AD1) ||
+            (tactis_chtype[ch] == AD2)  || (tactis_chtype[ch] == AD3) ||
+            (tactis_chtype[ch] == AV1)  || (tactis_chtype[ch] == AV2) ||
+            (tactis_chtype[ch] == AV3));
+}
+
+
+/* return True if char is consonant */
+Private Bool
+THAI_iscons (unsigned char	ch)
+{
+    return (tactis_chtype[ch] == CONS);
+}
+
+
+/* return True if char is vowel */
+Private Bool
+THAI_isvowel (unsigned char	ch)
+{
+    return ((tactis_chtype[ch] == LV)  || (tactis_chtype[ch] == FV1) ||
+            (tactis_chtype[ch] == FV2) || (tactis_chtype[ch] == FV3) ||
+            (tactis_chtype[ch] == BV1) || (tactis_chtype[ch] == BV2) ||
+            (tactis_chtype[ch] == AV1) || (tactis_chtype[ch] == AV2) ||
+            (tactis_chtype[ch] == AV3));
+}
+
+
+/* return True if char is tonemark */
+Private Bool
+THAI_istone (unsigned char	ch)
+{
+    return (tactis_chtype[ch] == TONE);
+}
+#endif
+
+Private Bool
+THAI_iscomposible (
+    unsigned char	follow_ch, 
+    unsigned char	lead_ch)
+{/* "Can follow_ch be put in the same display cell as lead_ch?" */
+
+    return (write_rules_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] 
+            == CP);
+}
+
+Private Bool
+THAI_isaccepted (
+    unsigned char	follow_ch, 
+    unsigned char	lead_ch,
+    unsigned char	mode)
+{
+    Bool iskeyvalid; /*  means "Can follow_ch be keyed in after lead_ch?" */
+
+    switch (mode)
+    {
+        case WTT_ISC1:
+            iskeyvalid = 
+          (wtt_isc1_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ);
+            break;
+        case WTT_ISC2:
+            iskeyvalid = 
+          (wtt_isc2_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ);
+            break;
+        case THAICAT_ISC:
+            iskeyvalid =
+       (thaicat_isc_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ);
+            break;
+        default:
+            iskeyvalid = True;
+            break;
+    }
+
+    return iskeyvalid;
+}
+
+#ifdef UNUSED
+Private void 
+THAI_apply_write_rules(
+    unsigned char	*instr, 
+    unsigned char	*outstr, 
+    unsigned char	insert_ch, 
+    int 		*num_insert_ch)
+{
+/*
+Input parameters: 
+    instr - input string
+    insert_ch specify what char to be added when invalid composition is found
+Output parameters:
+    outstr - output string after input string has been applied the rules
+    num_insert_ch - number of insert_ch added to outstr.
+*/
+    unsigned char   *lead_ch = NULL, *follow_ch = NULL, *out_ch = NULL;
+
+    *num_insert_ch = 0;
+    lead_ch = follow_ch = instr;
+    out_ch = outstr;
+    if ((*lead_ch == '\0') || !(THAI_find_chtype(instr,DEAD)))
+    {   /* Empty string or can't find any non-spacing char*/
+        strcpy((char *)outstr, (char *)instr);
+    } else { /* String of length >= 1, keep looking */
+        follow_ch++;
+        if (THAI_isdead(*lead_ch)) { /* is first char non-spacing? */
+            *out_ch++ = SPACE;
+            (*num_insert_ch)++;
+        }
+        *out_ch++ = *lead_ch;
+        while (*follow_ch != '\0')  /* more char in string to check */
+        {
+            if (THAI_isdead(*follow_ch) && 
+                 !THAI_iscomposible(*follow_ch,*lead_ch)) 
+            {
+                *out_ch++ = SPACE;
+                (*num_insert_ch)++;
+            }
+            *out_ch++ = *follow_ch;
+            lead_ch = follow_ch;
+            follow_ch++;
+        }
+        *out_ch = '\0';
+    }
+}
+
+Private int 
+THAI_find_chtype (
+    unsigned char	*instr, 
+    int		chtype)
+{
+/*
+Input parameters:
+    instr - input string
+    chtype - type of character to look for
+Output parameters:
+    function returns first position of character with matched chtype
+    function returns -1 if it does not find.
+*/
+    int i = 0, position = -1;
+
+    switch (chtype)
+    {
+        case DEAD:
+            for (i = 0; *instr != '\0' && THAI_isdead(*instr); i++, instr++)
+		;
+            if (*instr != '\0') position = i; 
+            break;
+        default:
+            break;
+    }
+    return position;
+}
+
+
+Private int 
+THAI_apply_scm(
+    unsigned char	*instr, 
+    unsigned char	*outstr, 
+    unsigned char	spec_ch, 
+    int		num_sp, 
+    unsigned char	insert_ch)
+{
+    unsigned char   *scan, *outch;
+    int             i, dead_count, found_count;
+    Bool            isconsecutive;
+
+    scan = instr;
+    outch = outstr;
+    dead_count = found_count = 0;
+    isconsecutive = False;
+    while (*scan != '\0') {
+        if (THAI_isdead(*scan))
+            dead_count++;       /* count number of non-spacing char */
+        if (*scan == spec_ch)
+            if (!isconsecutive) 
+                found_count++;      /* count number consecutive spec char found */
+        *outch++ = *scan++;
+        if (found_count == num_sp) {
+            for (i = 0; i < dead_count; i++)
+                *outch++ = insert_ch;
+            dead_count = found_count = 0;
+        }
+    }
+    /* what to return? */
+    return 0; /* probably not right but better than returning garbage */
+}
+
+
+/* The following functions are copied from XKeyBind.c */
+
+Private void ComputeMaskFromKeytrans();
+Private int IsCancelComposeKey(KeySym *symbol, XKeyEvent *event);
+Private void SetLed(Display *dpy, int num, int state);
+Private CARD8 FindKeyCode();
+
+
+/* The following functions are specific to this module */ 
+
+Private int XThaiTranslateKey();
+Private int XThaiTranslateKeySym();
+
+
+Private KeySym HexIMNormalKey(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event);
+Private KeySym HexIMFirstComposeKey(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event);
+Private KeySym HexIMSecondComposeKey(
+    XicThaiPart *thai_part,
+    KeySym symbol
+    XKeyEvent *event);
+Private KeySym HexIMComposeSequence(KeySym ks1, KeySym ks2);
+Private void InitIscMode(Xic ic);
+Private Bool ThaiComposeConvert(
+    Display *dpy,
+    KeySym insym,
+    KeySym *outsym, KeySym *lower, KeySym *upper);
+#endif
+
+/*
+ * Definitions
+ */
+
+#define BellVolume 		0
+
+#define ucs2tis(wc)  \
+ (unsigned char) ( \
+   (0<=(wc)&&(wc)<=0x7F) ? \
+     (wc) : \
+     ((0x0E01<=(wc)&&(wc)<=0x0E5F) ? ((wc)-0x0E00+0xA0) : 0))
+/* "c" is an unsigned char */
+#define tis2ucs(c)  \
+  ( \
+   ((c)<=0x7F) ? \
+     (wchar_t)(c) : \
+     ((0x0A1<=(c)) ? ((wchar_t)(c)-0xA0+0x0E00) : 0))
+
+/*
+ * Macros to save and recall last input character in XIC
+ */
+#define IC_SavePreviousChar(ic,ch) \
+		(*((ic)->private.local.context->mb) = (char) (ch))
+#define IC_ClearPreviousChar(ic) \
+		(*((ic)->private.local.context->mb) = 0)
+#define IC_GetPreviousChar(ic) \
+		(IC_RealGetPreviousChar(ic,1))
+#define IC_GetContextChar(ic) \
+		(IC_RealGetPreviousChar(ic,2))
+#define IC_DeletePreviousChar(ic) \
+		(IC_RealDeletePreviousChar(ic))
+
+Private unsigned char
+IC_RealGetPreviousChar(Xic ic, unsigned short pos)
+{
+    XICCallback* cb = &ic->core.string_conversion_callback;
+
+    if (cb && cb->callback) {
+        XIMStringConversionCallbackStruct screc;
+        unsigned char c;
+
+        /* Use a safe value of position = 0 and stretch the range to desired
+         * place, as XIM protocol is unclear here whether it could be negative
+         */
+        screc.position = 0;
+        screc.direction = XIMBackwardChar;
+        screc.operation = XIMStringConversionRetrieval;
+        screc.factor = pos;
+        screc.text = 0;
+
+        (cb->callback)((XIC)ic, cb->client_data, (XPointer)&screc);
+        if (!screc.text)
+            return (unsigned char) *((ic)->private.local.context->mb);
+        if ((screc.text->feedback &&
+             *screc.text->feedback == XIMStringConversionLeftEdge) ||
+            screc.text->length < 1)
+        {
+            c = 0;
+        } else {
+            if (screc.text->encoding_is_wchar) {
+                c = ucs2tis(screc.text->string.wcs[0]);
+                XFree(screc.text->string.wcs);
+            } else {
+                c = screc.text->string.mbs[0];
+                XFree(screc.text->string.mbs);
+            }
+        }
+        XFree(screc.text);
+        return c;
+    } else {
+        return (unsigned char) *((ic)->private.local.context->mb);
+    }
+}
+
+Private unsigned char
+IC_RealDeletePreviousChar(Xic ic)
+{
+    XICCallback* cb = &ic->core.string_conversion_callback;
+
+    if (cb && cb->callback) {
+        XIMStringConversionCallbackStruct screc;
+        unsigned char c;
+
+        screc.position = 0;
+        screc.direction = XIMBackwardChar;
+        screc.operation = XIMStringConversionSubstitution;
+        screc.factor = 1;
+        screc.text = 0;
+
+        (cb->callback)((XIC)ic, cb->client_data, (XPointer)&screc);
+        if (!screc.text) { return 0; }
+        if ((screc.text->feedback &&
+             *screc.text->feedback == XIMStringConversionLeftEdge) ||
+            screc.text->length < 1)
+        {
+            c = 0;
+        } else {
+            if (screc.text->encoding_is_wchar) {
+                c = ucs2tis(screc.text->string.wcs[0]);
+                XFree(screc.text->string.wcs);
+            } else {
+                c = screc.text->string.mbs[0];
+                XFree(screc.text->string.mbs);
+            }
+        }
+        XFree(screc.text);
+        return c;
+    } else {
+        return 0;
+    }
+}
+/*
+ * Input sequence check mode in XIC
+ */
+#define IC_IscMode(ic)		((ic)->private.local.thai.input_mode)
+
+/*
+ * Max. size of string handled by the two String Lookup functions.
+ */
+#define STR_LKUP_BUF_SIZE	256
+
+/*
+ * Size of buffer to contain previous locale name.
+ */
+#define SAV_LOCALE_NAME_SIZE	256
+
+/*
+ * Size of buffer to contain the IM modifier.
+ */
+#define MAXTHAIIMMODLEN 20
+
+#define AllMods (ShiftMask|LockMask|ControlMask| \
+		 Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask)
+
+
+#define IsISOControlKey(ks) ((ks) >= XK_2 && (ks) <= XK_8)
+
+#define IsValidControlKey(ks)   (((((ks)>=XK_A && (ks)<=XK_asciitilde) || \
+                (ks)==XK_space || (ks)==XK_Delete) && \
+                ((ks)!=0)))
+
+#define COMPOSE_LED 2
+
+#ifdef UNUSED
+typedef KeySym (*StateProc)(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event);
+
+
+/*
+ * macros to classify XKeyEvent state field
+ */
+
+#define IsShift(state) (((state) & ShiftMask) != 0)
+#define IsLock(state) (((state) & LockMask) != 0)
+#define IsControl(state) (((state) & ControlMask) != 0)
+#define IsMod1(state) (((state) & Mod1Mask) != 0)
+#define IsMod2(state) (((state) & Mod2Mask) != 0)
+#define IsMod3(state) (((state) & Mod3Mask) != 0)
+#define IsMod4(state) (((state) & Mod4Mask) != 0)
+#define IsMod5(state) (((state) & Mod5Mask) != 0)
+
+/*
+ * key starts Thai compose sequence (Hex input method) if :
+ */
+
+#define IsComposeKey(ks, event)  \
+	(( ks==XK_Alt_L && 	\
+	   IsControl((event)->state) &&	\
+	   !IsShift((event)->state))	\
+	 ? True : False)
+
+
+/*
+ *  State handler to implement the Thai hex input method.
+ */
+
+Private int const nstate_handlers = 3;
+Private StateProc state_handler[] = {
+	HexIMNormalKey,
+	HexIMFirstComposeKey,
+	HexIMSecondComposeKey
+};
+
+
+/*
+ *  Table for 'Thai Compose' character input.
+ *  The current implementation uses latin-1 keysyms.
+ */
+struct _XMapThaiKey {
+	KeySym from;
+	KeySym to;
+};
+
+Private struct _XMapThaiKey const ThaiComposeTable[] = {
+	{ /* 0xa4 */ XK_currency,	/* 0xa5 */ XK_yen },
+	{ /* 0xa2 */ XK_cent,		/* 0xa3 */ XK_sterling },
+	{ /* 0xe6 */ XK_ae,		/* 0xef */ XK_idiaeresis },
+	{ /* 0xd3 */ XK_Oacute,		/* 0xee */ XK_icircumflex },
+	{ /* 0xb9 */ XK_onesuperior,	/* 0xfa */ XK_uacute },
+	{ /* 0xd2 */ XK_Ograve,		/* 0xe5 */ XK_aring },
+	{ /* 0xbc */ XK_onequarter,	/* 0xfb */ XK_ucircumflex },
+	{	     XK_VoidSymbol,		   XK_VoidSymbol }
+};
+
+struct _XKeytrans {
+	struct _XKeytrans *next;/* next on list */
+	char *string;		/* string to return when the time comes */
+	int len;		/* length of string (since NULL is legit)*/
+	KeySym key;		/* keysym rebound */
+	unsigned int state;	/* modifier state */
+	KeySym *modifiers;	/* modifier keysyms you want */
+	int mlen;		/* length of modifier list */
+};
+
+
+/* Convert keysym to 'Thai Compose' keysym */
+/* The current implementation use latin-1 keysyms */
+Private Bool
+ThaiComposeConvert(
+    Display *dpy,
+    KeySym insym,
+    KeySym *outsym, KeySym *lower, KeySym *upper)
+{
+    struct _XMapThaiKey const *table_entry = ThaiComposeTable;
+
+    while (table_entry->from != XK_VoidSymbol) {
+	if (table_entry->from == insym) {
+	    *outsym = table_entry->to;
+	    *lower = *outsym;
+	    *upper = *outsym;
+	    return True;
+	}
+	table_entry++;
+    }
+    return False;
+}
+
+Private int
+XThaiTranslateKey(
+    register Display *dpy,
+    KeyCode keycode,
+    register unsigned int modifiers,
+    unsigned int *modifiers_return,
+    KeySym *keysym_return,
+    KeySym *lsym_return,
+    KeySym *usym_return)
+{
+    int per;
+    register KeySym *syms;
+    KeySym sym = 0, lsym = 0, usym = 0;
+
+    if ((! dpy->keysyms) && (! _XKeyInitialize(dpy)))
+	return 0;
+    *modifiers_return = (ShiftMask|LockMask) | dpy->mode_switch;
+    if (((int)keycode < dpy->min_keycode) || ((int)keycode > dpy->max_keycode))
+    {
+	*keysym_return = NoSymbol;
+	return 1;
+    }
+    per = dpy->keysyms_per_keycode;
+    syms = &dpy->keysyms[(keycode - dpy->min_keycode) * per];
+    while ((per > 2) && (syms[per - 1] == NoSymbol))
+	per--;
+    if ((per > 2) && (modifiers & dpy->mode_switch)) {
+	syms += 2;
+	per -= 2;
+    }
+    if (!(modifiers & ShiftMask) &&
+	(!(modifiers & LockMask) || (dpy->lock_meaning == NoSymbol))) {
+	if ((per == 1) || (syms[1] == NoSymbol))
+	    XConvertCase(syms[0], keysym_return, &usym);
+	else {
+	    XConvertCase(syms[0], &lsym, &usym);
+	    *keysym_return = syms[0];
+	}
+    } else if (!(modifiers & LockMask) ||
+	       (dpy->lock_meaning != XK_Caps_Lock)) {
+	if ((per == 1) || ((usym = syms[1]) == NoSymbol))
+	    XConvertCase(syms[0], &lsym, &usym);
+	*keysym_return = usym;
+    } else {
+	if ((per == 1) || ((sym = syms[1]) == NoSymbol))
+	    sym = syms[0];
+	XConvertCase(sym, &lsym, &usym);
+	if (!(modifiers & ShiftMask) && (sym != syms[0]) &&
+	    ((sym != usym) || (lsym == usym)))
+	    XConvertCase(syms[0], &lsym, &usym);
+	*keysym_return = usym;
+    }
+    /*
+     * ThaiCat keyboard support :
+     * When the Shift and Thai keys are hold for some keys a 'Thai Compose'  
+     * character code is generated which is different from column 3 and
+     * 4 of the keymap. 
+     * Since we don't know whether ThaiCat keyboard or WTT keyboard is
+     * in use, the same mapping is done for all Thai input.
+     * We just arbitary choose to use column 3 keysyms as the indices of 
+     * this mapping.
+     * When the control key is also hold, this mapping has no effect.
+     */
+    if ((modifiers & Mod1Mask) &&
+	(modifiers & ShiftMask) &&
+	!(modifiers & ControlMask)) {
+	if (ThaiComposeConvert(dpy, syms[0], &sym, &lsym, &usym))
+	    *keysym_return = sym;
+    }
+
+    if (*keysym_return == XK_VoidSymbol)
+	*keysym_return = NoSymbol;
+    *lsym_return = lsym;
+    *usym_return = usym;
+    return 1;
+}
+
+/* 
+ * XThaiTranslateKeySym
+ *
+ * Translate KeySym to TACTIS code output.
+ * The current implementation uses ISO latin-1 keysym.
+ * Should be changed to TACTIS keysyms when they are defined by the
+ * standard.
+ */
+Private int
+XThaiTranslateKeySym(
+    Display *dpy,
+    register KeySym symbol,
+    register KeySym lsym,
+    register KeySym usym,
+    unsigned int modifiers,
+    unsigned char *buffer,
+    int nbytes)
+{
+    KeySym ckey = 0;
+    register struct _XKeytrans *p; 
+    int length;
+    unsigned long hiBytes;
+    register unsigned char c;
+
+    /*
+     * initialize length = 1 ;
+     */
+    length = 1;
+
+    if (!symbol)
+	return 0;
+    /* see if symbol rebound, if so, return that string. */
+    for (p = dpy->key_bindings; p; p = p->next) {
+	if (((modifiers & AllMods) == p->state) && (symbol == p->key)) {
+	    length = p->len;
+	    if (length > nbytes) length = nbytes;
+	    memcpy (buffer, p->string, length);
+	    return length;
+	}
+    }
+    /* try to convert to TACTIS, handling control */
+    hiBytes = symbol >> 8;
+    if (!(nbytes &&
+	  ((hiBytes == 0) ||
+	   ((hiBytes == 0xFF) &&
+	    (((symbol >= XK_BackSpace) && (symbol <= XK_Clear)) ||
+	     (symbol == XK_Return) ||
+	     (symbol == XK_Escape) ||
+	     (symbol == XK_KP_Space) ||
+	     (symbol == XK_KP_Tab) ||
+	     (symbol == XK_KP_Enter) ||
+	     ((symbol >= XK_KP_Multiply) && (symbol <= XK_KP_9)) ||
+	     (symbol == XK_KP_Equal) ||
+             (symbol == XK_Scroll_Lock) ||
+#ifdef DXK_PRIVATE /* DEC private keysyms */
+             (symbol == DXK_Remove) ||
+#endif
+             (symbol == NoSymbol) ||
+	     (symbol == XK_Delete))))))
+	return 0;
+
+    /* if X keysym, convert to ascii by grabbing low 7 bits */
+    if (symbol == XK_KP_Space)
+	c = XK_space & 0x7F; /* patch encoding botch */
+/* not for Thai
+    else if (symbol == XK_hyphen)
+	c = XK_minus & 0xFF; */ /* map to equiv character */
+    else if (hiBytes == 0xFF)
+	c = symbol & 0x7F;
+    else
+	c = symbol & 0xFF;
+    /* only apply Control key if it makes sense, else ignore it */
+    if (modifiers & ControlMask) {
+    if (!(IsKeypadKey(lsym) || lsym==XK_Return || lsym==XK_Tab)) {
+        if (IsISOControlKey(lsym)) ckey = lsym;
+        else if (IsISOControlKey(usym)) ckey = usym;
+        else if (lsym == XK_question) ckey = lsym;
+        else if (usym == XK_question) ckey = usym;
+        else if (IsValidControlKey(lsym)) ckey = lsym;
+        else if (IsValidControlKey(usym)) ckey = usym;
+        else length = 0;
+
+        if (length != 0) {
+        if (ckey == XK_2) c = '\000';
+        else if (ckey >= XK_3 && ckey <= XK_7)
+            c = (char)(ckey-('3'-'\033'));
+        else if (ckey == XK_8) c = '\177';
+        else if (ckey == XK_Delete) c = '\030';
+        else if (ckey == XK_question) c = '\037';
+        else if (ckey == XK_quoteleft) c = '\036';  /* KLee 1/24/91 */
+        else c = (char)(ckey & 0x1f);
+        }
+    }
+    }
+    /*
+     *  ThaiCat has a key that generates two TACTIS codes D1 & E9.
+     *  It is represented by the latin-1 keysym XK_thorn (0xfe). 
+     *  If c is XK_thorn, this key is pressed and it is converted to  
+     *  0xd1 0xe9.
+     */
+    if (c == XK_thorn) {
+	buffer[0] = 0xd1;
+	buffer[1] = 0xe9;
+	buffer[2] = '\0';
+	return 2;
+    }
+    else {
+	/* Normal case */
+        buffer[0] = c;
+	buffer[1] = '\0';
+        return 1;
+    }
+}
+
+/*
+ * given a KeySym, returns the first keycode containing it, if any.
+ */
+Private CARD8
+FindKeyCode(
+    register Display *dpy,
+    register KeySym code)
+{
+
+    register KeySym *kmax = dpy->keysyms + 
+	(dpy->max_keycode - dpy->min_keycode + 1) * dpy->keysyms_per_keycode;
+    register KeySym *k = dpy->keysyms;
+    while (k < kmax) {
+	if (*k == code)
+	    return (((k - dpy->keysyms) / dpy->keysyms_per_keycode) +
+		    dpy->min_keycode);
+	k += 1;
+	}
+    return 0;
+}
+
+/*
+ * given a list of modifiers, computes the mask necessary for later matching.
+ * This routine must lookup the key in the Keymap and then search to see
+ * what modifier it is bound to, if any.  Sets the AnyModifier bit if it
+ * can't map some keysym to a modifier.
+ */
+Private void
+ComputeMaskFromKeytrans(
+    Display *dpy,
+    register struct _XKeytrans *p)
+{
+    register int i;
+    register CARD8 code;
+    register XModifierKeymap *m = dpy->modifiermap;
+
+    p->state = AnyModifier;
+    for (i = 0; i < p->mlen; i++) {
+	/* if not found, then not on current keyboard */
+	if ((code = FindKeyCode(dpy, p->modifiers[i])) == 0)
+		return;
+	/* code is now the keycode for the modifier you want */
+	{
+	    register int j = m->max_keypermod<<3;
+
+	    while ((--j >= 0) && (code != m->modifiermap[j]))
+		;
+	    if (j < 0)
+		return;
+	    p->state |= (1<<(j/m->max_keypermod));
+	}
+    }
+    p->state &= AllMods;
+}
+
+/************************************************************************
+ *
+ *
+ * Compose handling routines - compose handlers 0,1,2
+ * 
+ * 
+ ************************************************************************/
+
+#define NORMAL_KEY_STATE 0
+#define FIRST_COMPOSE_KEY_STATE 1
+#define SECOND_COMPOSE_KEY_STATE 2
+
+Private
+KeySym HexIMNormalKey(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event)
+{
+    if (IsComposeKey (symbol, event))	/* start compose sequence	*/
+	{
+	SetLed (event->display,COMPOSE_LED, LedModeOn);
+	thai_part->comp_state = FIRST_COMPOSE_KEY_STATE;
+	return NoSymbol;
+	}
+    return symbol;
+}
+
+
+Private
+KeySym HexIMFirstComposeKey(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event)
+{
+    if (IsModifierKey (symbol)) return symbol; /* ignore shift etc. */
+    if (IsCancelComposeKey (&symbol, event))	/* cancel sequence */
+	{
+	SetLed (event->display,COMPOSE_LED, LedModeOff);
+	thai_part->comp_state = NORMAL_KEY_STATE;
+	return symbol;
+	}
+    if (IsComposeKey (symbol, event))		/* restart sequence ?? */
+	{
+	return NoSymbol;			/* no state change necessary */
+	}
+
+    thai_part->keysym = symbol;		/* save key pressed */
+    thai_part->comp_state = SECOND_COMPOSE_KEY_STATE;
+    return NoSymbol;
+}
+
+Private
+KeySym HexIMSecondComposeKey(
+    XicThaiPart *thai_part,
+    KeySym symbol,
+    XKeyEvent *event)
+{
+    if (IsModifierKey (symbol)) return symbol;	/* ignore shift etc. */
+    if (IsComposeKey (symbol, event))		/* restart sequence ? */
+	{
+	thai_part->comp_state =FIRST_COMPOSE_KEY_STATE;
+	return NoSymbol;
+	}
+    SetLed (event->display,COMPOSE_LED, LedModeOff);
+    if (IsCancelComposeKey (&symbol, event))	/* cancel sequence ? */
+	{
+	thai_part->comp_state = NORMAL_KEY_STATE;
+	return symbol;
+	}
+
+    if ((symbol = HexIMComposeSequence (thai_part->keysym, symbol))
+								==NoSymbol)
+	{ /* invalid compose sequence */
+	XBell(event->display, BellVolume);
+	}
+    thai_part->comp_state = NORMAL_KEY_STATE; /* reset to normal state */
+    return symbol;
+}
+
+
+/*
+ * Interprets two keysyms entered as hex digits and return the Thai keysym
+ * correspond to the TACTIS code formed.
+ * The current implementation of this routine returns ISO Latin Keysyms.
+ */
+
+Private
+KeySym HexIMComposeSequence(KeySym ks1, KeySym ks2)
+{
+int	hi_digit;
+int	lo_digit;
+int	tactis_code;
+
+    if ((ks1 >= XK_0) && (ks1 <= XK_9))
+	hi_digit = ks1 - XK_0;
+    else if ((ks1 >= XK_A) && (ks1 <= XK_F))
+	hi_digit = ks1 - XK_A + 10;
+    else if ((ks1 >= XK_a) && (ks1 <= XK_f))
+	hi_digit = ks1 - XK_a + 10;
+    else	/* out of range */
+	return NoSymbol;
+	    
+    if ((ks2 >= XK_0) && (ks2 <= XK_9))
+	lo_digit = ks2 - XK_0;
+    else if ((ks2 >= XK_A) && (ks2 <= XK_F))
+	lo_digit = ks2 - XK_A + 10;
+    else if ((ks2 >= XK_a) && (ks2 <= XK_f))
+	lo_digit = ks2 - XK_a + 10;
+    else	/* out of range */
+	return NoSymbol;
+
+    tactis_code = hi_digit * 0x10 + lo_digit ;
+
+    return (KeySym)tactis_code;
+
+}
+
+/*
+ * routine determines
+ *	1) whether key event should cancel a compose sequence
+ *	2) whether cancelling key event should be processed or ignored
+ */
+
+Private
+int IsCancelComposeKey(
+    KeySym *symbol,
+    XKeyEvent *event)
+{
+    if (*symbol==XK_Delete && !IsControl(event->state) &&
+						!IsMod1(event->state)) {
+	*symbol=NoSymbol;  /* cancel compose sequence, and ignore key */
+	return True;
+    }
+    if (IsComposeKey(*symbol, event)) return False;
+    return (
+	IsControl (event->state) ||
+	IsMod1(event->state) ||
+	IsKeypadKey (*symbol) ||
+	IsFunctionKey (*symbol) ||
+	IsMiscFunctionKey (*symbol) ||
+#ifdef DXK_PRIVATE /* DEC private keysyms */
+	*symbol == DXK_Remove ||
+#endif
+	IsPFKey (*symbol) ||
+	IsCursorKey (*symbol) ||
+	(*symbol >= XK_Tab && *symbol < XK_Multi_key)
+		? True : False);	/* cancel compose sequence and pass */
+					/* cancelling key through	    */
+}
+
+
+/*
+ *	set specified keyboard LED on or off
+ */
+
+Private
+void SetLed(
+    Display *dpy,
+    int num,
+    int state)
+{
+    XKeyboardControl led_control;
+
+    led_control.led_mode = state;
+    led_control.led = num;
+    XChangeKeyboardControl (dpy, KBLed | KBLedMode,	&led_control);
+}
+#endif
+
+/*
+ * Initialize ISC mode from im modifier 
+ */
+Private void InitIscMode(Xic ic)
+{
+    Xim im;
+    char *im_modifier_name;
+
+    /* If already defined, just return */
+
+    if (IC_IscMode(ic)) return;
+
+    /* Get IM modifier */
+
+    im = (Xim) XIMOfIC((XIC)ic);
+    im_modifier_name = im->core.im_name;
+
+    /* Match with predefined value, default is Basic Check */
+
+    if (!strncmp(im_modifier_name,"BasicCheck",MAXTHAIIMMODLEN+1))
+	IC_IscMode(ic) = WTT_ISC1;
+    else if (!strncmp(im_modifier_name,"Strict",MAXTHAIIMMODLEN+1))
+	IC_IscMode(ic) = WTT_ISC2;
+    else if (!strncmp(im_modifier_name,"Thaicat",MAXTHAIIMMODLEN+1))
+	IC_IscMode(ic) = THAICAT_ISC;
+    else if (!strncmp(im_modifier_name,"Passthrough",MAXTHAIIMMODLEN+1))
+	IC_IscMode(ic) = NOISC;
+    else
+	IC_IscMode(ic) = WTT_ISC1;
+
+    return;
+}
+    
+/*
+ * Helper functions for _XimThaiFilter()
+ */
+Private Bool
+ThaiFltAcceptInput(Xic ic, unsigned char new_char, KeySym symbol)
+{
+    ic->private.local.composed->wc[0] = tis2ucs(new_char);
+    ic->private.local.composed->wc[1] = '\0';
+
+    if ((new_char <= 0x1f) || (new_char == 0x7f))
+        ic->private.local.composed->keysym = symbol;
+    else
+        ic->private.local.composed->keysym = NoSymbol;
+
+    return True;
+}
+
+Private Bool
+ThaiFltReorderInput(Xic ic, unsigned char previous_char, unsigned char new_char)
+{
+    if (!IC_DeletePreviousChar(ic)) return False;
+    ic->private.local.composed->wc[0] = tis2ucs(new_char);
+    ic->private.local.composed->wc[1] = tis2ucs(previous_char);
+    ic->private.local.composed->wc[2] = '\0';
+
+    ic->private.local.composed->keysym = NoSymbol;
+
+    return True;
+}
+
+Private Bool
+ThaiFltReplaceInput(Xic ic, unsigned char new_char, KeySym symbol)
+{
+    if (!IC_DeletePreviousChar(ic)) return False;
+    ic->private.local.composed->wc[0] = tis2ucs(new_char);
+    ic->private.local.composed->wc[1] = '\0';
+
+    if ((new_char <= 0x1f) || (new_char == 0x7f))
+        ic->private.local.composed->keysym = symbol;
+    else
+        ic->private.local.composed->keysym = NoSymbol;
+
+    return True;
+}
+
+/*
+ * Filter function for TACTIS
+ */
+Bool
+_XimThaiFilter(d, w, ev, client_data)
+Display		*d;
+Window		w;
+XEvent		*ev;
+XPointer	client_data;
+{
+    Xic		    ic = (Xic)client_data;
+    KeySym 	    symbol;
+    int 	    isc_mode; /* Thai Input Sequence Check mode */
+    unsigned char   previous_char; /* Last inputted Thai char */
+    unsigned char   new_char;
+#ifdef UNUSED
+    unsigned int    modifiers;
+    KeySym	    lsym,usym;
+    int		    state;
+    XicThaiPart     *thai_part;
+    char	    buf[10];
+#endif
+    wchar_t	    wbuf[10];
+    Bool            isReject;
+
+    if ((ev->type != KeyPress)
+        || (ev->xkey.keycode == 0))
+        return False;
+
+    if (!IC_IscMode(ic)) InitIscMode(ic);
+
+    XwcLookupString((XIC)ic, &ev->xkey, wbuf, sizeof(wbuf) / sizeof(wbuf[0]),
+		    &symbol, NULL);
+
+    if ((ev->xkey.state & (AllMods & ~ShiftMask)) ||
+         ((symbol >> 8 == 0xFF) &&
+         ((XK_BackSpace <= symbol && symbol <= XK_Clear) ||
+           (symbol == XK_Return) ||
+           (symbol == XK_Pause) ||
+           (symbol == XK_Scroll_Lock) ||
+           (symbol == XK_Sys_Req) ||
+           (symbol == XK_Escape) ||
+           (symbol == XK_Delete) ||
+           IsCursorKey(symbol) ||
+           IsKeypadKey(symbol) ||
+           IsMiscFunctionKey(symbol) ||
+           IsFunctionKey(symbol))))
+        {
+            IC_ClearPreviousChar(ic); 
+            return False;
+        }
+    if (((symbol >> 8 == 0xFF) &&
+         IsModifierKey(symbol)) ||
+#ifdef XK_XKB_KEYS
+        ((symbol >> 8 == 0xFE) &&
+         (XK_ISO_Lock <= symbol && symbol <= XK_ISO_Last_Group_Lock)) ||
+#endif
+        (symbol == NoSymbol))
+    {
+        return False;
+    }
+#ifdef UNUSED
+    if (! XThaiTranslateKey(ev->xkey.display, ev->xkey.keycode, ev->xkey.state,
+	 		&modifiers, &symbol, &lsym, &usym))
+	return False;
+
+    /*
+     *  Hex input method processing 
+     */
+
+    thai_part = &ic->private.local.thai;
+    state = thai_part->comp_state;
+    if (state >= 0 && state < nstate_handlers) /* call handler for state */
+    {
+        symbol = (* state_handler[state])(thai_part, symbol, (XKeyEvent *)ev);
+    }
+
+    /*
+     *  Translate KeySym into mb.
+     */
+    count = XThaiTranslateKeySym(ev->xkey.display, symbol, lsym,
+				usym, ev->xkey.state, buf, 10);
+
+    if (!symbol && !count)
+	return True;
+
+    /* Return symbol if cannot convert to character */
+    if (!count)
+	return False;
+#endif
+
+    /*
+     *  Thai Input sequence check
+     */
+    isc_mode = IC_IscMode(ic);
+    if (!(previous_char = IC_GetPreviousChar(ic))) previous_char = ' ';
+    new_char = ucs2tis(wbuf[0]);
+    isReject = True;
+    if (THAI_isaccepted(new_char, previous_char, isc_mode)) {
+        ThaiFltAcceptInput(ic, new_char, symbol);
+        isReject = False;
+    } else {
+        unsigned char context_char;
+
+        context_char = IC_GetContextChar(ic);
+        if (context_char) {
+            if (THAI_iscomposible(new_char, context_char)) {
+                if (THAI_iscomposible(previous_char, new_char)) {
+                    isReject = !ThaiFltReorderInput(ic, previous_char, new_char);
+                } else if (THAI_iscomposible(previous_char, context_char)) {
+                    isReject = !ThaiFltReplaceInput(ic, new_char, symbol);
+                } else if (THAI_chtype(previous_char) == FV1
+                           && THAI_chtype(new_char) == TONE) {
+                    isReject = !ThaiFltReorderInput(ic, previous_char, new_char);
+                }
+            } else if (THAI_isaccepted(new_char, context_char, isc_mode)) {
+                isReject = !ThaiFltReplaceInput(ic, new_char, symbol);
+            }
+        }
+    }
+    if (isReject) {
+        /* reject character */
+        XBell(ev->xkey.display, BellVolume);
+        return True;
+    }
+
+    _Xlcwcstombs(ic->core.im->core.lcd, ic->private.local.composed->mb,
+		 ic->private.local.composed->wc, 10);
+
+    _Xlcmbstoutf8(ic->core.im->core.lcd, ic->private.local.composed->utf8,
+		  ic->private.local.composed->mb, 10);
+
+    /* Remember the last character inputted
+     * (as fallback in case StringConversionCallback is not provided)
+     */
+    IC_SavePreviousChar(ic, new_char);
+
+    ev->xkey.keycode = 0;
+    XPutBackEvent(d, ev);
+    return True;
+}