/************************************************************************
 * $Id: minibidi.c 5120 2005-01-16 14:33:43Z owen $
 *
 * ------------
 * Description:
 * ------------
 * This is an implemention of Unicode's Bidirectional Algorithm
 * (known as UAX #9).
 *
 *   http://www.unicode.org/reports/tr9/
 *
 * Author: Ahmad Khalifa
 *
 * -----------------
 * Revision Details:    (Updated by Revision Control System)
 * -----------------
 *  $Date: 2005-01-16 14:33:43 +0000 (Sun, 16 Jan 2005) $
 *  $Author: owen $
 *  $Revision: 5120 $
 *
 * (www.arabeyes.org - under MIT license)
 *
 ************************************************************************/

/*
 * TODO:
 * =====
 * - Explicit marks need to be handled (they are not 100% now)
 * - Ligatures
 */

#include <stdlib.h>		/* definition of wchar_t */

#include "misc.h"

#define LMASK	0x3F		/* Embedding Level mask */
#define OMASK	0xC0		/* Override mask */
#define OISL	0x80		/* Override is L */
#define OISR	0x40		/* Override is R */

/* For standalone compilation in a testing mode.
 * Still depends on the PuTTY headers for snewn and sfree, but can avoid
 * _linking_ with any other PuTTY code. */
#ifdef TEST_GETTYPE
#define safemalloc malloc
#define safefree free
#endif

/* Shaping Helpers */
#define STYPE(xh) ((((xh) >= SHAPE_FIRST) && ((xh) <= SHAPE_LAST)) ? \
shapetypes[(xh)-SHAPE_FIRST].type : SU)	/*)) */
#define SISOLATED(xh) (shapetypes[(xh)-SHAPE_FIRST].form_b)
#define SFINAL(xh) ((xh)+1)
#define SINITIAL(xh) ((xh)+2)
#define SMEDIAL(ch) ((ch)+3)

#define leastGreaterOdd(x) ( ((x)+1) | 1 )
#define leastGreaterEven(x) ( ((x)+2) &~ 1 )

typedef struct bidi_char {
    wchar_t origwc, wc;
    unsigned short index;
} bidi_char;

/* function declarations */
void flipThisRun(bidi_char * from, unsigned char *level, int max,
		 int count);
int findIndexOfRun(unsigned char *level, int start, int count, int tlevel);
unsigned char getType(int ch);
unsigned char setOverrideBits(unsigned char level, unsigned char override);
int getPreviousLevel(unsigned char *level, int from);
int do_shape(bidi_char * line, bidi_char * to, int count);
int do_bidi(bidi_char * line, int count);
void doMirror(wchar_t * ch);

/* character types */
enum {
    L,
    LRE,
    LRO,
    R,
    AL,
    RLE,
    RLO,
    PDF,
    EN,
    ES,
    ET,
    AN,
    CS,
    NSM,
    BN,
    B,
    S,
    WS,
    ON
};

/* Shaping Types */
enum {
    SL,				/* Left-Joining, doesnt exist in U+0600 - U+06FF */
    SR,				/* Right-Joining, ie has Isolated, Final */
    SD,				/* Dual-Joining, ie has Isolated, Final, Initial, Medial */
    SU,				/* Non-Joining */
    SC				/* Join-Causing, like U+0640 (TATWEEL) */
};

typedef struct {
    char type;
    wchar_t form_b;
} shape_node;

/* Kept near the actual table, for verification. */
#define SHAPE_FIRST 0x621
#define SHAPE_LAST 0x64A

const shape_node shapetypes[] = {
    /* index, Typ, Iso, Ligature Index */
    /* 621 */ {SU, 0xFE80},
    /* 622 */ {SR, 0xFE81},
    /* 623 */ {SR, 0xFE83},
    /* 624 */ {SR, 0xFE85},
    /* 625 */ {SR, 0xFE87},
    /* 626 */ {SD, 0xFE89},
    /* 627 */ {SR, 0xFE8D},
    /* 628 */ {SD, 0xFE8F},
    /* 629 */ {SR, 0xFE93},
    /* 62A */ {SD, 0xFE95},
    /* 62B */ {SD, 0xFE99},
    /* 62C */ {SD, 0xFE9D},
    /* 62D */ {SD, 0xFEA1},
    /* 62E */ {SD, 0xFEA5},
    /* 62F */ {SR, 0xFEA9},
    /* 630 */ {SR, 0xFEAB},
    /* 631 */ {SR, 0xFEAD},
    /* 632 */ {SR, 0xFEAF},
    /* 633 */ {SD, 0xFEB1},
    /* 634 */ {SD, 0xFEB5},
    /* 635 */ {SD, 0xFEB9},
    /* 636 */ {SD, 0xFEBD},
    /* 637 */ {SD, 0xFEC1},
    /* 638 */ {SD, 0xFEC5},
    /* 639 */ {SD, 0xFEC9},
    /* 63A */ {SD, 0xFECD},
    /* 63B */ {SU, 0x0},
    /* 63C */ {SU, 0x0},
    /* 63D */ {SU, 0x0},
    /* 63E */ {SU, 0x0},
    /* 63F */ {SU, 0x0},
    /* 640 */ {SC, 0x0},
    /* 641 */ {SD, 0xFED1},
    /* 642 */ {SD, 0xFED5},
    /* 643 */ {SD, 0xFED9},
    /* 644 */ {SD, 0xFEDD},
    /* 645 */ {SD, 0xFEE1},
    /* 646 */ {SD, 0xFEE5},
    /* 647 */ {SD, 0xFEE9},
    /* 648 */ {SR, 0xFEED},
				/* 649 */ {SR, 0xFEEF},
				/* SD */
    /* 64A */ {SD, 0xFEF1}
};

/*
 * Flips the text buffer, according to max level, and
 * all higher levels
 *
 * Input:
 * from: text buffer, on which to apply flipping
 * level: resolved levels buffer
 * max: the maximum level found in this line (should be unsigned char)
 * count: line size in bidi_char
 */
void flipThisRun(bidi_char * from, unsigned char *level, int max,
		 int count)
{
    int i, j, k, tlevel;
    bidi_char temp;

    j = i = 0;
    while (i < count && j < count) {

	/* find the start of the run of level=max */
	tlevel = max;
	i = j = findIndexOfRun(level, i, count, max);
	/* find the end of the run */
	while (i < count && tlevel <= level[i]) {
	    i++;
	}
	for (k = i - 1; k > j; k--, j++) {
	    temp = from[k];
	    from[k] = from[j];
	    from[j] = temp;
	}
    }
}

/*
 * Finds the index of a run with level equals tlevel
 */
int findIndexOfRun(unsigned char *level, int start, int count, int tlevel)
{
    int i;
    for (i = start; i < count; i++) {
	if (tlevel == level[i]) {
	    return i;
	}
    }
    return count;
}

/*
 * Returns the bidi character type of ch.
 *
 * The data table in this function is constructed from the Unicode
 * Character Database, downloadable from unicode.org at the URL
 * 
 *     http://www.unicode.org/Public/UNIDATA/UnicodeData.txt
 * 
 * by the following fragment of Perl:

perl -ne 'split ";"; $num = hex $_[0]; $type = $_[4];' \
      -e '$fl = ($_[1] =~ /First/ ? 1 : $_[1] =~ /Last/ ? 2 : 0);' \
      -e 'if ($type eq $runtype and ($runend == $num-1 or ' \
      -e '    ($fl==2 and $pfl==1))) {$runend = $num;} else { &reset; }' \
      -e '$pfl=$fl; END { &reset }; sub reset {' \
      -e 'printf"        {0x%04x, 0x%04x, %s},\n",$runstart,$runend,$runtype' \
      -e '  if defined $runstart and $runtype ne "ON";' \
      -e '$runstart=$runend=$num; $runtype=$type;}' \
    UnicodeData.txt

 */
unsigned char getType(int ch)
{
    static const struct {
	int first, last, type;
    } lookup[] = {
	{
	0x0000, 0x0008, BN}, {
	0x0009, 0x0009, S}, {
	0x000a, 0x000a, B}, {
	0x000b, 0x000b, S}, {
	0x000c, 0x000c, WS}, {
	0x000d, 0x000d, B}, {
	0x000e, 0x001b, BN}, {
	0x001c, 0x001e, B}, {
	0x001f, 0x001f, S}, {
	0x0020, 0x0020, WS}, {
	0x0023, 0x0025, ET}, {
	0x002b, 0x002b, ES}, {
	0x002c, 0x002c, CS}, {
	0x002d, 0x002d, ES}, {
	0x002e, 0x002f, CS}, {
	0x0030, 0x0039, EN}, {
	0x003a, 0x003a, CS}, {
	0x0041, 0x005a, L}, {
	0x0061, 0x007a, L}, {
	0x007f, 0x0084, BN}, {
	0x0085, 0x0085, B}, {
	0x0086, 0x009f, BN}, {
	0x00a0, 0x00a0, CS}, {
	0x00a2, 0x00a5, ET}, {
	0x00aa, 0x00aa, L}, {
	0x00ad, 0x00ad, BN}, {
	0x00b0, 0x00b1, ET}, {
	0x00b2, 0x00b3, EN}, {
	0x00b5, 0x00b5, L}, {
	0x00b9, 0x00b9, EN}, {
	0x00ba, 0x00ba, L}, {
	0x00c0, 0x00d6, L}, {
	0x00d8, 0x00f6, L}, {
	0x00f8, 0x0236, L}, {
	0x0250, 0x02b8, L}, {
	0x02bb, 0x02c1, L}, {
	0x02d0, 0x02d1, L}, {
	0x02e0, 0x02e4, L}, {
	0x02ee, 0x02ee, L}, {
	0x0300, 0x0357, NSM}, {
	0x035d, 0x036f, NSM}, {
	0x037a, 0x037a, L}, {
	0x0386, 0x0386, L}, {
	0x0388, 0x038a, L}, {
	0x038c, 0x038c, L}, {
	0x038e, 0x03a1, L}, {
	0x03a3, 0x03ce, L}, {
	0x03d0, 0x03f5, L}, {
	0x03f7, 0x03fb, L}, {
	0x0400, 0x0482, L}, {
	0x0483, 0x0486, NSM}, {
	0x0488, 0x0489, NSM}, {
	0x048a, 0x04ce, L}, {
	0x04d0, 0x04f5, L}, {
	0x04f8, 0x04f9, L}, {
	0x0500, 0x050f, L}, {
	0x0531, 0x0556, L}, {
	0x0559, 0x055f, L}, {
	0x0561, 0x0587, L}, {
	0x0589, 0x0589, L}, {
	0x0591, 0x05a1, NSM}, {
	0x05a3, 0x05b9, NSM}, {
	0x05bb, 0x05bd, NSM}, {
	0x05be, 0x05be, R}, {
	0x05bf, 0x05bf, NSM}, {
	0x05c0, 0x05c0, R}, {
	0x05c1, 0x05c2, NSM}, {
	0x05c3, 0x05c3, R}, {
	0x05c4, 0x05c4, NSM}, {
	0x05d0, 0x05ea, R}, {
	0x05f0, 0x05f4, R}, {
	0x0600, 0x0603, AL}, {
	0x060c, 0x060c, CS}, {
	0x060d, 0x060d, AL}, {
	0x0610, 0x0615, NSM}, {
	0x061b, 0x061b, AL}, {
	0x061f, 0x061f, AL}, {
	0x0621, 0x063a, AL}, {
	0x0640, 0x064a, AL}, {
	0x064b, 0x0658, NSM}, {
	0x0660, 0x0669, AN}, {
	0x066a, 0x066a, ET}, {
	0x066b, 0x066c, AN}, {
	0x066d, 0x066f, AL}, {
	0x0670, 0x0670, NSM}, {
	0x0671, 0x06d5, AL}, {
	0x06d6, 0x06dc, NSM}, {
	0x06dd, 0x06dd, AL}, {
	0x06de, 0x06e4, NSM}, {
	0x06e5, 0x06e6, AL}, {
	0x06e7, 0x06e8, NSM}, {
	0x06ea, 0x06ed, NSM}, {
	0x06ee, 0x06ef, AL}, {
	0x06f0, 0x06f9, EN}, {
	0x06fa, 0x070d, AL}, {
	0x070f, 0x070f, BN}, {
	0x0710, 0x0710, AL}, {
	0x0711, 0x0711, NSM}, {
	0x0712, 0x072f, AL}, {
	0x0730, 0x074a, NSM}, {
	0x074d, 0x074f, AL}, {
	0x0780, 0x07a5, AL}, {
	0x07a6, 0x07b0, NSM}, {
	0x07b1, 0x07b1, AL}, {
	0x0901, 0x0902, NSM}, {
	0x0903, 0x0939, L}, {
	0x093c, 0x093c, NSM}, {
	0x093d, 0x0940, L}, {
	0x0941, 0x0948, NSM}, {
	0x0949, 0x094c, L}, {
	0x094d, 0x094d, NSM}, {
	0x0950, 0x0950, L}, {
	0x0951, 0x0954, NSM}, {
	0x0958, 0x0961, L}, {
	0x0962, 0x0963, NSM}, {
	0x0964, 0x0970, L}, {
	0x0981, 0x0981, NSM}, {
	0x0982, 0x0983, L}, {
	0x0985, 0x098c, L}, {
	0x098f, 0x0990, L}, {
	0x0993, 0x09a8, L}, {
	0x09aa, 0x09b0, L}, {
	0x09b2, 0x09b2, L}, {
	0x09b6, 0x09b9, L}, {
	0x09bc, 0x09bc, NSM}, {
	0x09bd, 0x09c0, L}, {
	0x09c1, 0x09c4, NSM}, {
	0x09c7, 0x09c8, L}, {
	0x09cb, 0x09cc, L}, {
	0x09cd, 0x09cd, NSM}, {
	0x09d7, 0x09d7, L}, {
	0x09dc, 0x09dd, L}, {
	0x09df, 0x09e1, L}, {
	0x09e2, 0x09e3, NSM}, {
	0x09e6, 0x09f1, L}, {
	0x09f2, 0x09f3, ET}, {
	0x09f4, 0x09fa, L}, {
	0x0a01, 0x0a02, NSM}, {
	0x0a03, 0x0a03, L}, {
	0x0a05, 0x0a0a, L}, {
	0x0a0f, 0x0a10, L}, {
	0x0a13, 0x0a28, L}, {
	0x0a2a, 0x0a30, L}, {
	0x0a32, 0x0a33, L}, {
	0x0a35, 0x0a36, L}, {
	0x0a38, 0x0a39, L}, {
	0x0a3c, 0x0a3c, NSM}, {
	0x0a3e, 0x0a40, L}, {
	0x0a41, 0x0a42, NSM}, {
	0x0a47, 0x0a48, NSM}, {
	0x0a4b, 0x0a4d, NSM}, {
	0x0a59, 0x0a5c, L}, {
	0x0a5e, 0x0a5e, L}, {
	0x0a66, 0x0a6f, L}, {
	0x0a70, 0x0a71, NSM}, {
	0x0a72, 0x0a74, L}, {
	0x0a81, 0x0a82, NSM}, {
	0x0a83, 0x0a83, L}, {
	0x0a85, 0x0a8d, L}, {
	0x0a8f, 0x0a91, L}, {
	0x0a93, 0x0aa8, L}, {
	0x0aaa, 0x0ab0, L}, {
	0x0ab2, 0x0ab3, L}, {
	0x0ab5, 0x0ab9, L}, {
	0x0abc, 0x0abc, NSM}, {
	0x0abd, 0x0ac0, L}, {
	0x0ac1, 0x0ac5, NSM}, {
	0x0ac7, 0x0ac8, NSM}, {
	0x0ac9, 0x0ac9, L}, {
	0x0acb, 0x0acc, L}, {
	0x0acd, 0x0acd, NSM}, {
	0x0ad0, 0x0ad0, L}, {
	0x0ae0, 0x0ae1, L}, {
	0x0ae2, 0x0ae3, NSM}, {
	0x0ae6, 0x0aef, L}, {
	0x0af1, 0x0af1, ET}, {
	0x0b01, 0x0b01, NSM}, {
	0x0b02, 0x0b03, L}, {
	0x0b05, 0x0b0c, L}, {
	0x0b0f, 0x0b10, L}, {
	0x0b13, 0x0b28, L}, {
	0x0b2a, 0x0b30, L}, {
	0x0b32, 0x0b33, L}, {
	0x0b35, 0x0b39, L}, {
	0x0b3c, 0x0b3c, NSM}, {
	0x0b3d, 0x0b3e, L}, {
	0x0b3f, 0x0b3f, NSM}, {
	0x0b40, 0x0b40, L}, {
	0x0b41, 0x0b43, NSM}, {
	0x0b47, 0x0b48, L}, {
	0x0b4b, 0x0b4c, L}, {
	0x0b4d, 0x0b4d, NSM}, {
	0x0b56, 0x0b56, NSM}, {
	0x0b57, 0x0b57, L}, {
	0x0b5c, 0x0b5d, L}, {
	0x0b5f, 0x0b61, L}, {
	0x0b66, 0x0b71, L}, {
	0x0b82, 0x0b82, NSM}, {
	0x0b83, 0x0b83, L}, {
	0x0b85, 0x0b8a, L}, {
	0x0b8e, 0x0b90, L}, {
	0x0b92, 0x0b95, L}, {
	0x0b99, 0x0b9a, L}, {
	0x0b9c, 0x0b9c, L}, {
	0x0b9e, 0x0b9f, L}, {
	0x0ba3, 0x0ba4, L}, {
	0x0ba8, 0x0baa, L}, {
	0x0bae, 0x0bb5, L}, {
	0x0bb7, 0x0bb9, L}, {
	0x0bbe, 0x0bbf, L}, {
	0x0bc0, 0x0bc0, NSM}, {
	0x0bc1, 0x0bc2, L}, {
	0x0bc6, 0x0bc8, L}, {
	0x0bca, 0x0bcc, L}, {
	0x0bcd, 0x0bcd, NSM}, {
	0x0bd7, 0x0bd7, L}, {
	0x0be7, 0x0bf2, L}, {
	0x0bf9, 0x0bf9, ET}, {
	0x0c01, 0x0c03, L}, {
	0x0c05, 0x0c0c, L}, {
	0x0c0e, 0x0c10, L}, {
	0x0c12, 0x0c28, L}, {
	0x0c2a, 0x0c33, L}, {
	0x0c35, 0x0c39, L}, {
	0x0c3e, 0x0c40, NSM}, {
	0x0c41, 0x0c44, L}, {
	0x0c46, 0x0c48, NSM}, {
	0x0c4a, 0x0c4d, NSM}, {
	0x0c55, 0x0c56, NSM}, {
	0x0c60, 0x0c61, L}, {
	0x0c66, 0x0c6f, L}, {
	0x0c82, 0x0c83, L}, {
	0x0c85, 0x0c8c, L}, {
	0x0c8e, 0x0c90, L}, {
	0x0c92, 0x0ca8, L}, {
	0x0caa, 0x0cb3, L}, {
	0x0cb5, 0x0cb9, L}, {
	0x0cbc, 0x0cbc, NSM}, {
	0x0cbd, 0x0cc4, L}, {
	0x0cc6, 0x0cc8, L}, {
	0x0cca, 0x0ccb, L}, {
	0x0ccc, 0x0ccd, NSM}, {
	0x0cd5, 0x0cd6, L}, {
	0x0cde, 0x0cde, L}, {
	0x0ce0, 0x0ce1, L}, {
	0x0ce6, 0x0cef, L}, {
	0x0d02, 0x0d03, L}, {
	0x0d05, 0x0d0c, L}, {
	0x0d0e, 0x0d10, L}, {
	0x0d12, 0x0d28, L}, {
	0x0d2a, 0x0d39, L}, {
	0x0d3e, 0x0d40, L}, {
	0x0d41, 0x0d43, NSM}, {
	0x0d46, 0x0d48, L}, {
	0x0d4a, 0x0d4c, L}, {
	0x0d4d, 0x0d4d, NSM}, {
	0x0d57, 0x0d57, L}, {
	0x0d60, 0x0d61, L}, {
	0x0d66, 0x0d6f, L}, {
	0x0d82, 0x0d83, L}, {
	0x0d85, 0x0d96, L}, {
	0x0d9a, 0x0db1, L}, {
	0x0db3, 0x0dbb, L}, {
	0x0dbd, 0x0dbd, L}, {
	0x0dc0, 0x0dc6, L}, {
	0x0dca, 0x0dca, NSM}, {
	0x0dcf, 0x0dd1, L}, {
	0x0dd2, 0x0dd4, NSM}, {
	0x0dd6, 0x0dd6, NSM}, {
	0x0dd8, 0x0ddf, L}, {
	0x0df2, 0x0df4, L}, {
	0x0e01, 0x0e30, L}, {
	0x0e31, 0x0e31, NSM}, {
	0x0e32, 0x0e33, L}, {
	0x0e34, 0x0e3a, NSM}, {
	0x0e3f, 0x0e3f, ET}, {
	0x0e40, 0x0e46, L}, {
	0x0e47, 0x0e4e, NSM}, {
	0x0e4f, 0x0e5b, L}, {
	0x0e81, 0x0e82, L}, {
	0x0e84, 0x0e84, L}, {
	0x0e87, 0x0e88, L}, {
	0x0e8a, 0x0e8a, L}, {
	0x0e8d, 0x0e8d, L}, {
	0x0e94, 0x0e97, L}, {
	0x0e99, 0x0e9f, L}, {
	0x0ea1, 0x0ea3, L}, {
	0x0ea5, 0x0ea5, L}, {
	0x0ea7, 0x0ea7, L}, {
	0x0eaa, 0x0eab, L}, {
	0x0ead, 0x0eb0, L}, {
	0x0eb1, 0x0eb1, NSM}, {
	0x0eb2, 0x0eb3, L}, {
	0x0eb4, 0x0eb9, NSM}, {
	0x0ebb, 0x0ebc, NSM}, {
	0x0ebd, 0x0ebd, L}, {
	0x0ec0, 0x0ec4, L}, {
	0x0ec6, 0x0ec6, L}, {
	0x0ec8, 0x0ecd, NSM}, {
	0x0ed0, 0x0ed9, L}, {
	0x0edc, 0x0edd, L}, {
	0x0f00, 0x0f17, L}, {
	0x0f18, 0x0f19, NSM}, {
	0x0f1a, 0x0f34, L}, {
	0x0f35, 0x0f35, NSM}, {
	0x0f36, 0x0f36, L}, {
	0x0f37, 0x0f37, NSM}, {
	0x0f38, 0x0f38, L}, {
	0x0f39, 0x0f39, NSM}, {
	0x0f3e, 0x0f47, L}, {
	0x0f49, 0x0f6a, L}, {
	0x0f71, 0x0f7e, NSM}, {
	0x0f7f, 0x0f7f, L}, {
	0x0f80, 0x0f84, NSM}, {
	0x0f85, 0x0f85, L}, {
	0x0f86, 0x0f87, NSM}, {
	0x0f88, 0x0f8b, L}, {
	0x0f90, 0x0f97, NSM}, {
	0x0f99, 0x0fbc, NSM}, {
	0x0fbe, 0x0fc5, L}, {
	0x0fc6, 0x0fc6, NSM}, {
	0x0fc7, 0x0fcc, L}, {
	0x0fcf, 0x0fcf, L}, {
	0x1000, 0x1021, L}, {
	0x1023, 0x1027, L}, {
	0x1029, 0x102a, L}, {
	0x102c, 0x102c, L}, {
	0x102d, 0x1030, NSM}, {
	0x1031, 0x1031, L}, {
	0x1032, 0x1032, NSM}, {
	0x1036, 0x1037, NSM}, {
	0x1038, 0x1038, L}, {
	0x1039, 0x1039, NSM}, {
	0x1040, 0x1057, L}, {
	0x1058, 0x1059, NSM}, {
	0x10a0, 0x10c5, L}, {
	0x10d0, 0x10f8, L}, {
	0x10fb, 0x10fb, L}, {
	0x1100, 0x1159, L}, {
	0x115f, 0x11a2, L}, {
	0x11a8, 0x11f9, L}, {
	0x1200, 0x1206, L}, {
	0x1208, 0x1246, L}, {
	0x1248, 0x1248, L}, {
	0x124a, 0x124d, L}, {
	0x1250, 0x1256, L}, {
	0x1258, 0x1258, L}, {
	0x125a, 0x125d, L}, {
	0x1260, 0x1286, L}, {
	0x1288, 0x1288, L}, {
	0x128a, 0x128d, L}, {
	0x1290, 0x12ae, L}, {
	0x12b0, 0x12b0, L}, {
	0x12b2, 0x12b5, L}, {
	0x12b8, 0x12be, L}, {
	0x12c0, 0x12c0, L}, {
	0x12c2, 0x12c5, L}, {
	0x12c8, 0x12ce, L}, {
	0x12d0, 0x12d6, L}, {
	0x12d8, 0x12ee, L}, {
	0x12f0, 0x130e, L}, {
	0x1310, 0x1310, L}, {
	0x1312, 0x1315, L}, {
	0x1318, 0x131e, L}, {
	0x1320, 0x1346, L}, {
	0x1348, 0x135a, L}, {
	0x1361, 0x137c, L}, {
	0x13a0, 0x13f4, L}, {
	0x1401, 0x1676, L}, {
	0x1680, 0x1680, WS}, {
	0x1681, 0x169a, L}, {
	0x16a0, 0x16f0, L}, {
	0x1700, 0x170c, L}, {
	0x170e, 0x1711, L}, {
	0x1712, 0x1714, NSM}, {
	0x1720, 0x1731, L}, {
	0x1732, 0x1734, NSM}, {
	0x1735, 0x1736, L}, {
	0x1740, 0x1751, L}, {
	0x1752, 0x1753, NSM}, {
	0x1760, 0x176c, L}, {
	0x176e, 0x1770, L}, {
	0x1772, 0x1773, NSM}, {
	0x1780, 0x17b6, L}, {
	0x17b7, 0x17bd, NSM}, {
	0x17be, 0x17c5, L}, {
	0x17c6, 0x17c6, NSM}, {
	0x17c7, 0x17c8, L}, {
	0x17c9, 0x17d3, NSM}, {
	0x17d4, 0x17da, L}, {
	0x17db, 0x17db, ET}, {
	0x17dc, 0x17dc, L}, {
	0x17dd, 0x17dd, NSM}, {
	0x17e0, 0x17e9, L}, {
	0x180b, 0x180d, NSM}, {
	0x180e, 0x180e, WS}, {
	0x1810, 0x1819, L}, {
	0x1820, 0x1877, L}, {
	0x1880, 0x18a8, L}, {
	0x18a9, 0x18a9, NSM}, {
	0x1900, 0x191c, L}, {
	0x1920, 0x1922, NSM}, {
	0x1923, 0x1926, L}, {
	0x1927, 0x192b, NSM}, {
	0x1930, 0x1931, L}, {
	0x1932, 0x1932, NSM}, {
	0x1933, 0x1938, L}, {
	0x1939, 0x193b, NSM}, {
	0x1946, 0x196d, L}, {
	0x1970, 0x1974, L}, {
	0x1d00, 0x1d6b, L}, {
	0x1e00, 0x1e9b, L}, {
	0x1ea0, 0x1ef9, L}, {
	0x1f00, 0x1f15, L}, {
	0x1f18, 0x1f1d, L}, {
	0x1f20, 0x1f45, L}, {
	0x1f48, 0x1f4d, L}, {
	0x1f50, 0x1f57, L}, {
	0x1f59, 0x1f59, L}, {
	0x1f5b, 0x1f5b, L}, {
	0x1f5d, 0x1f5d, L}, {
	0x1f5f, 0x1f7d, L}, {
	0x1f80, 0x1fb4, L}, {
	0x1fb6, 0x1fbc, L}, {
	0x1fbe, 0x1fbe, L}, {
	0x1fc2, 0x1fc4, L}, {
	0x1fc6, 0x1fcc, L}, {
	0x1fd0, 0x1fd3, L}, {
	0x1fd6, 0x1fdb, L}, {
	0x1fe0, 0x1fec, L}, {
	0x1ff2, 0x1ff4, L}, {
	0x1ff6, 0x1ffc, L}, {
	0x2000, 0x200a, WS}, {
	0x200b, 0x200d, BN}, {
	0x200e, 0x200e, L}, {
	0x200f, 0x200f, R}, {
	0x2028, 0x2028, WS}, {
	0x2029, 0x2029, B}, {
	0x202a, 0x202a, LRE}, {
	0x202b, 0x202b, RLE}, {
	0x202c, 0x202c, PDF}, {
	0x202d, 0x202d, LRO}, {
	0x202e, 0x202e, RLO}, {
	0x202f, 0x202f, WS}, {
	0x2030, 0x2034, ET}, {
	0x2044, 0x2044, CS}, {
	0x205f, 0x205f, WS}, {
	0x2060, 0x2063, BN}, {
	0x206a, 0x206f, BN}, {
	0x2070, 0x2070, EN}, {
	0x2071, 0x2071, L}, {
	0x2074, 0x2079, EN}, {
	0x207a, 0x207b, ET}, {
	0x207f, 0x207f, L}, {
	0x2080, 0x2089, EN}, {
	0x208a, 0x208b, ET}, {
	0x20a0, 0x20b1, ET}, {
	0x20d0, 0x20ea, NSM}, {
	0x2102, 0x2102, L}, {
	0x2107, 0x2107, L}, {
	0x210a, 0x2113, L}, {
	0x2115, 0x2115, L}, {
	0x2119, 0x211d, L}, {
	0x2124, 0x2124, L}, {
	0x2126, 0x2126, L}, {
	0x2128, 0x2128, L}, {
	0x212a, 0x212d, L}, {
	0x212e, 0x212e, ET}, {
	0x212f, 0x2131, L}, {
	0x2133, 0x2139, L}, {
	0x213d, 0x213f, L}, {
	0x2145, 0x2149, L}, {
	0x2160, 0x2183, L}, {
	0x2212, 0x2213, ET}, {
	0x2336, 0x237a, L}, {
	0x2395, 0x2395, L}, {
	0x2488, 0x249b, EN}, {
	0x249c, 0x24e9, L}, {
	0x2800, 0x28ff, L}, {
	0x3000, 0x3000, WS}, {
	0x3005, 0x3007, L}, {
	0x3021, 0x3029, L}, {
	0x302a, 0x302f, NSM}, {
	0x3031, 0x3035, L}, {
	0x3038, 0x303c, L}, {
	0x3041, 0x3096, L}, {
	0x3099, 0x309a, NSM}, {
	0x309d, 0x309f, L}, {
	0x30a1, 0x30fa, L}, {
	0x30fc, 0x30ff, L}, {
	0x3105, 0x312c, L}, {
	0x3131, 0x318e, L}, {
	0x3190, 0x31b7, L}, {
	0x31f0, 0x321c, L}, {
	0x3220, 0x3243, L}, {
	0x3260, 0x327b, L}, {
	0x327f, 0x32b0, L}, {
	0x32c0, 0x32cb, L}, {
	0x32d0, 0x32fe, L}, {
	0x3300, 0x3376, L}, {
	0x337b, 0x33dd, L}, {
	0x33e0, 0x33fe, L}, {
	0x3400, 0x4db5, L}, {
	0x4e00, 0x9fa5, L}, {
	0xa000, 0xa48c, L}, {
	0xac00, 0xd7a3, L}, {
	0xd800, 0xfa2d, L}, {
	0xfa30, 0xfa6a, L}, {
	0xfb00, 0xfb06, L}, {
	0xfb13, 0xfb17, L}, {
	0xfb1d, 0xfb1d, R}, {
	0xfb1e, 0xfb1e, NSM}, {
	0xfb1f, 0xfb28, R}, {
	0xfb29, 0xfb29, ET}, {
	0xfb2a, 0xfb36, R}, {
	0xfb38, 0xfb3c, R}, {
	0xfb3e, 0xfb3e, R}, {
	0xfb40, 0xfb41, R}, {
	0xfb43, 0xfb44, R}, {
	0xfb46, 0xfb4f, R}, {
	0xfb50, 0xfbb1, AL}, {
	0xfbd3, 0xfd3d, AL}, {
	0xfd50, 0xfd8f, AL}, {
	0xfd92, 0xfdc7, AL}, {
	0xfdf0, 0xfdfc, AL}, {
	0xfe00, 0xfe0f, NSM}, {
	0xfe20, 0xfe23, NSM}, {
	0xfe50, 0xfe50, CS}, {
	0xfe52, 0xfe52, CS}, {
	0xfe55, 0xfe55, CS}, {
	0xfe5f, 0xfe5f, ET}, {
	0xfe62, 0xfe63, ET}, {
	0xfe69, 0xfe6a, ET}, {
	0xfe70, 0xfe74, AL}, {
	0xfe76, 0xfefc, AL}, {
	0xfeff, 0xfeff, BN}, {
	0xff03, 0xff05, ET}, {
	0xff0b, 0xff0b, ET}, {
	0xff0c, 0xff0c, CS}, {
	0xff0d, 0xff0d, ET}, {
	0xff0e, 0xff0e, CS}, {
	0xff0f, 0xff0f, ES}, {
	0xff10, 0xff19, EN}, {
	0xff1a, 0xff1a, CS}, {
	0xff21, 0xff3a, L}, {
	0xff41, 0xff5a, L}, {
	0xff66, 0xffbe, L}, {
	0xffc2, 0xffc7, L}, {
	0xffca, 0xffcf, L}, {
	0xffd2, 0xffd7, L}, {
	0xffda, 0xffdc, L}, {
	0xffe0, 0xffe1, ET}, {
	0xffe5, 0xffe6, ET}, {
	0x10000, 0x1000b, L}, {
	0x1000d, 0x10026, L}, {
	0x10028, 0x1003a, L}, {
	0x1003c, 0x1003d, L}, {
	0x1003f, 0x1004d, L}, {
	0x10050, 0x1005d, L}, {
	0x10080, 0x100fa, L}, {
	0x10100, 0x10100, L}, {
	0x10102, 0x10102, L}, {
	0x10107, 0x10133, L}, {
	0x10137, 0x1013f, L}, {
	0x10300, 0x1031e, L}, {
	0x10320, 0x10323, L}, {
	0x10330, 0x1034a, L}, {
	0x10380, 0x1039d, L}, {
	0x1039f, 0x1039f, L}, {
	0x10400, 0x1049d, L}, {
	0x104a0, 0x104a9, L}, {
	0x10800, 0x10805, R}, {
	0x10808, 0x10808, R}, {
	0x1080a, 0x10835, R}, {
	0x10837, 0x10838, R}, {
	0x1083c, 0x1083c, R}, {
	0x1083f, 0x1083f, R}, {
	0x1d000, 0x1d0f5, L}, {
	0x1d100, 0x1d126, L}, {
	0x1d12a, 0x1d166, L}, {
	0x1d167, 0x1d169, NSM}, {
	0x1d16a, 0x1d172, L}, {
	0x1d173, 0x1d17a, BN}, {
	0x1d17b, 0x1d182, NSM}, {
	0x1d183, 0x1d184, L}, {
	0x1d185, 0x1d18b, NSM}, {
	0x1d18c, 0x1d1a9, L}, {
	0x1d1aa, 0x1d1ad, NSM}, {
	0x1d1ae, 0x1d1dd, L}, {
	0x1d400, 0x1d454, L}, {
	0x1d456, 0x1d49c, L}, {
	0x1d49e, 0x1d49f, L}, {
	0x1d4a2, 0x1d4a2, L}, {
	0x1d4a5, 0x1d4a6, L}, {
	0x1d4a9, 0x1d4ac, L}, {
	0x1d4ae, 0x1d4b9, L}, {
	0x1d4bb, 0x1d4bb, L}, {
	0x1d4bd, 0x1d4c3, L}, {
	0x1d4c5, 0x1d505, L}, {
	0x1d507, 0x1d50a, L}, {
	0x1d50d, 0x1d514, L}, {
	0x1d516, 0x1d51c, L}, {
	0x1d51e, 0x1d539, L}, {
	0x1d53b, 0x1d53e, L}, {
	0x1d540, 0x1d544, L}, {
	0x1d546, 0x1d546, L}, {
	0x1d54a, 0x1d550, L}, {
	0x1d552, 0x1d6a3, L}, {
	0x1d6a8, 0x1d7c9, L}, {
	0x1d7ce, 0x1d7ff, EN}, {
	0x20000, 0x2a6d6, L}, {
	0x2f800, 0x2fa1d, L}, {
	0xe0001, 0xe0001, BN}, {
	0xe0020, 0xe007f, BN}, {
	0xe0100, 0xe01ef, NSM}, {
	0xf0000, 0xffffd, L}, {
	0x100000, 0x10fffd, L}
    };

    int i, j, k;

    i = -1;
    j = lenof(lookup);

    while (j - i > 1) {
	k = (i + j) / 2;
	if (ch < lookup[k].first)
	    j = k;
	else if (ch > lookup[k].last)
	    i = k;
	else
	    return lookup[k].type;
    }

    /*
     * If we reach here, the character was not in any of the
     * intervals listed in the lookup table. This means we return
     * ON (`Other Neutrals'). This is the appropriate code for any
     * character genuinely not listed in the Unicode table, and
     * also the table above has deliberately left out any
     * characters _explicitly_ listed as ON (to save space!).
     */
    return ON;
}

/*
 * The most significant 2 bits of each level are used to store
 * Override status of each character
 * This function sets the override bits of level according
 * to the value in override, and reurns the new byte.
 */
unsigned char setOverrideBits(unsigned char level, unsigned char override)
{
    if (override == ON)
	return level;
    else if (override == R)
	return level | OISR;
    else if (override == L)
	return level | OISL;
    return level;
}

/*
 * Find the most recent run of the same value in `level', and
 * return the value _before_ it. Used to process U+202C POP
 * DIRECTIONAL FORMATTING.
 */
int getPreviousLevel(unsigned char *level, int from)
{
    if (from > 0) {
	unsigned char current = level[--from];

	while (from >= 0 && level[from] == current)
	    from--;

	if (from >= 0)
	    return level[from];

	return -1;
    } else
	return -1;
}

/* The Main shaping function, and the only one to be used
 * by the outside world.
 *
 * line: buffer to apply shaping to. this must be passed by doBidi() first
 * to: output buffer for the shaped data
 * count: number of characters in line
 */
int do_shape(bidi_char * line, bidi_char * to, int count)
{
    int i, tempShape, ligFlag;

    for (ligFlag = i = 0; i < count; i++) {
	to[i] = line[i];
	tempShape = STYPE(line[i].wc);
	switch (tempShape) {
	case SC:
	    break;

	case SU:
	    break;

	case SR:
	    tempShape = (i + 1 < count ? STYPE(line[i + 1].wc) : SU);
	    if ((tempShape == SL) || (tempShape == SD)
		|| (tempShape == SC))
		to[i].wc = SFINAL((SISOLATED(line[i].wc)));
	    else
		to[i].wc = SISOLATED(line[i].wc);
	    break;


	case SD:
	    /* Make Ligatures */
	    tempShape = (i + 1 < count ? STYPE(line[i + 1].wc) : SU);
	    if (line[i].wc == 0x644) {
		if (i > 0)
		    switch (line[i - 1].wc) {
		    case 0x622:
			ligFlag = 1;
			if ((tempShape == SL) || (tempShape == SD)
			    || (tempShape == SC))
			    to[i].wc = 0xFEF6;
			else
			    to[i].wc = 0xFEF5;
			break;
		    case 0x623:
			ligFlag = 1;
			if ((tempShape == SL) || (tempShape == SD)
			    || (tempShape == SC))
			    to[i].wc = 0xFEF8;
			else
			    to[i].wc = 0xFEF7;
			break;
		    case 0x625:
			ligFlag = 1;
			if ((tempShape == SL) || (tempShape == SD)
			    || (tempShape == SC))
			    to[i].wc = 0xFEFA;
			else
			    to[i].wc = 0xFEF9;
			break;
		    case 0x627:
			ligFlag = 1;
			if ((tempShape == SL) || (tempShape == SD)
			    || (tempShape == SC))
			    to[i].wc = 0xFEFC;
			else
			    to[i].wc = 0xFEFB;
			break;
		    }
		if (ligFlag) {
		    to[i - 1].wc = 0x20;
		    ligFlag = 0;
		    break;
		}
	    }

	    if ((tempShape == SL) || (tempShape == SD)
		|| (tempShape == SC)) {
		tempShape = (i > 0 ? STYPE(line[i - 1].wc) : SU);
		if ((tempShape == SR) || (tempShape == SD)
		    || (tempShape == SC))
		    to[i].wc = SMEDIAL((SISOLATED(line[i].wc)));
		else
		    to[i].wc = SFINAL((SISOLATED(line[i].wc)));
		break;
	    }

	    tempShape = (i > 0 ? STYPE(line[i - 1].wc) : SU);
	    if ((tempShape == SR) || (tempShape == SD)
		|| (tempShape == SC))
		to[i].wc = SINITIAL((SISOLATED(line[i].wc)));
	    else
		to[i].wc = SISOLATED(line[i].wc);
	    break;


	}
    }
    return 1;
}

/*
 * The Main Bidi Function, and the only function that should
 * be used by the outside world.
 *
 * line: a buffer of size count containing text to apply
 * the Bidirectional algorithm to.
 */

int do_bidi(bidi_char * line, int count)
{
    unsigned char *types;
    unsigned char *levels;
    unsigned char paragraphLevel;
    unsigned char currentEmbedding;
    unsigned char currentOverride;
    unsigned char tempType;
    int i, j, imax, yes, bover;

    /* Check the presence of R or AL types as optimization */
    yes = 0;
    for (i = 0; i < count; i++) {
	int type = getType(line[i].wc);
	if (type == R || type == AL) {
	    yes = 1;
	    break;
	}
    }
    if (yes == 0)
	return L;

    /* Initialize types, levels */
    types = snewn(count, unsigned char);
    levels = snewn(count, unsigned char);

    /* Rule (P1)  NOT IMPLEMENTED
     * P1. Split the text into separate paragraphs. A paragraph separator is
     * kept with the previous paragraph. Within each paragraph, apply all the
     * other rules of this algorithm.
     */

    /* Rule (P2), (P3)
     * P2. In each paragraph, find the first character of type L, AL, or R.
     * P3. If a character is found in P2 and it is of type AL or R, then set
     * the paragraph embedding level to one; otherwise, set it to zero.
     */
    paragraphLevel = 0;
    for (i = 0; i < count; i++) {
	int type = getType(line[i].wc);
	if (type == R || type == AL) {
	    paragraphLevel = 1;
	    break;
	} else if (type == L)
	    break;
    }

    /* Rule (X1)
     * X1. Begin by setting the current embedding level to the paragraph
     * embedding level. Set the directional override status to neutral.
     */
    currentEmbedding = paragraphLevel;
    currentOverride = ON;

    /* Rule (X2), (X3), (X4), (X5), (X6), (X7), (X8)
     * X2. With each RLE, compute the least greater odd embedding level.
     * X3. With each LRE, compute the least greater even embedding level.
     * X4. With each RLO, compute the least greater odd embedding level.
     * X5. With each LRO, compute the least greater even embedding level.
     * X6. For all types besides RLE, LRE, RLO, LRO, and PDF:
     *          a. Set the level of the current character to the current
     *              embedding level.
     *          b.  Whenever the directional override status is not neutral,
     *               reset the current character type to the directional
     *               override status.
     * X7. With each PDF, determine the matching embedding or override code.
     * If there was a valid matching code, restore (pop) the last
     * remembered (pushed) embedding level and directional override.
     * X8. All explicit directional embeddings and overrides are completely
     * terminated at the end of each paragraph. Paragraph separators are not
     * included in the embedding. (Useless here) NOT IMPLEMENTED
     */
    bover = 0;
    for (i = 0; i < count; i++) {
	tempType = getType(line[i].wc);
	switch (tempType) {
	case RLE:
	    currentEmbedding = levels[i] =
		leastGreaterOdd(currentEmbedding);
	    levels[i] = setOverrideBits(levels[i], currentOverride);
	    currentOverride = ON;
	    break;

	case LRE:
	    currentEmbedding = levels[i] =
		leastGreaterEven(currentEmbedding);
	    levels[i] = setOverrideBits(levels[i], currentOverride);
	    currentOverride = ON;
	    break;

	case RLO:
	    currentEmbedding = levels[i] =
		leastGreaterOdd(currentEmbedding);
	    tempType = currentOverride = R;
	    bover = 1;
	    break;

	case LRO:
	    currentEmbedding = levels[i] =
		leastGreaterEven(currentEmbedding);
	    tempType = currentOverride = L;
	    bover = 1;
	    break;

	case PDF:
	    {
		int prevlevel = getPreviousLevel(levels, i);

		if (prevlevel == -1) {
		    currentEmbedding = paragraphLevel;
		    currentOverride = ON;
		} else {
		    currentOverride = currentEmbedding & OMASK;
		    currentEmbedding = currentEmbedding & ~OMASK;
		}
	    }
	    levels[i] = currentEmbedding;
	    break;

	    /* Whitespace is treated as neutral for now */
	case WS:
	case S:
	    levels[i] = currentEmbedding;
	    tempType = ON;
	    if (currentOverride != ON)
		tempType = currentOverride;
	    break;

	default:
	    levels[i] = currentEmbedding;
	    if (currentOverride != ON)
		tempType = currentOverride;
	    break;

	}
	types[i] = tempType;
    }
    /* this clears out all overrides, so we can use levels safely... */
    /* checks bover first */
    if (bover)
	for (i = 0; i < count; i++)
	    levels[i] = levels[i] & LMASK;

    /* Rule (X9)
     * X9. Remove all RLE, LRE, RLO, LRO, PDF, and BN codes.
     * Here, they're converted to BN.
     */
    for (i = 0; i < count; i++) {
	switch (types[i]) {
	case RLE:
	case LRE:
	case RLO:
	case LRO:
	case PDF:
	    types[i] = BN;
	    break;
	}
    }

    /* Rule (W1)
     * W1. Examine each non-spacing mark (NSM) in the level run, and change
     * the type of the NSM to the type of the previous character. If the NSM
     * is at the start of the level run, it will get the type of sor.
     */
    if (types[0] == NSM)
	types[0] = paragraphLevel;

    for (i = 1; i < count; i++) {
	if (types[i] == NSM)
	    types[i] = types[i - 1];
	/* Is this a safe assumption?
	 * I assumed the previous, IS a character.
	 */
    }

    /* Rule (W2)
     * W2. Search backwards from each instance of a European number until the
     * first strong type (R, L, AL, or sor) is found.  If an AL is found,
     * change the type of the European number to Arabic number.
     */
    for (i = 0; i < count; i++) {
	if (types[i] == EN) {
	    j = i;
	    while (j >= 0) {
		if (types[j] == AL) {
		    types[i] = AN;
		    break;
		} else if (types[j] == R || types[j] == L) {
		    break;
		}
		j--;
	    }
	}
    }

    /* Rule (W3)
     * W3. Change all ALs to R.
     *
     * Optimization: on Rule Xn, we might set a flag on AL type
     * to prevent this loop in L R lines only...
     */
    for (i = 0; i < count; i++) {
	if (types[i] == AL)
	    types[i] = R;
    }

    /* Rule (W4)
     * W4. A single European separator between two European numbers changes
     * to a European number. A single common separator between two numbers
     * of the same type changes to that type.
     */
    for (i = 1; i < (count - 1); i++) {
	if (types[i] == ES) {
	    if (types[i - 1] == EN && types[i + 1] == EN)
		types[i] = EN;
	} else if (types[i] == CS) {
	    if (types[i - 1] == EN && types[i + 1] == EN)
		types[i] = EN;
	    else if (types[i - 1] == AN && types[i + 1] == AN)
		types[i] = AN;
	}
    }

    /* Rule (W5)
     * W5. A sequence of European terminators adjacent to European numbers
     * changes to all European numbers.
     *
     * Optimization: lots here... else ifs need rearrangement
     */
    for (i = 0; i < count; i++) {
	if (types[i] == ET) {
	    if (i > 0 && types[i - 1] == EN) {
		types[i] = EN;
		continue;
	    } else if (i < count - 1 && types[i + 1] == EN) {
		types[i] = EN;
		continue;
	    } else if (i < count - 1 && types[i + 1] == ET) {
		j = i;
		while (j < count && types[j] == ET) {
		    j++;
		}
		if (types[j] == EN)
		    types[i] = EN;
	    }
	}
    }

    /* Rule (W6)
     * W6. Otherwise, separators and terminators change to Other Neutral:
     */
    for (i = 0; i < count; i++) {
	switch (types[i]) {
	case ES:
	case ET:
	case CS:
	    types[i] = ON;
	    break;
	}
    }

    /* Rule (W7)
     * W7. Search backwards from each instance of a European number until
     * the first strong type (R, L, or sor) is found. If an L is found,
     * then change the type of the European number to L.
     */
    for (i = 0; i < count; i++) {
	if (types[i] == EN) {
	    j = i;
	    while (j >= 0) {
		if (types[j] == L) {
		    types[i] = L;
		    break;
		} else if (types[j] == R || types[j] == AL) {
		    break;
		}
		j--;
	    }
	}
    }

    /* Rule (N1)
     * N1. A sequence of neutrals takes the direction of the surrounding
     * strong text if the text on both sides has the same direction. European
     * and Arabic numbers are treated as though they were R.
     */
    if (count >= 2 && types[0] == ON) {
	if ((types[1] == R) || (types[1] == EN) || (types[1] == AN))
	    types[0] = R;
	else if (types[1] == L)
	    types[0] = L;
    }
    for (i = 1; i < (count - 1); i++) {
	if (types[i] == ON) {
	    if (types[i - 1] == L) {
		j = i;
		while (j < (count - 1) && types[j] == ON) {
		    j++;
		}
		if (types[j] == L) {
		    while (i < j) {
			types[i] = L;
			i++;
		    }
		}

	    } else if ((types[i - 1] == R) ||
		       (types[i - 1] == EN) || (types[i - 1] == AN)) {
		j = i;
		while (j < (count - 1) && types[j] == ON) {
		    j++;
		}
		if ((types[j] == R) ||
		    (types[j] == EN) || (types[j] == AN)) {
		    while (i < j) {
			types[i] = R;
			i++;
		    }
		}
	    }
	}
    }
    if (count >= 2 && types[count - 1] == ON) {
	if (types[count - 2] == R || types[count - 2] == EN
	    || types[count - 2] == AN)
	    types[count - 1] = R;
	else if (types[count - 2] == L)
	    types[count - 1] = L;
    }

    /* Rule (N2)
     * N2. Any remaining neutrals take the embedding direction.
     */
    for (i = 0; i < count; i++) {
	if (types[i] == ON) {
	    if ((levels[i] % 2) == 0)
		types[i] = L;
	    else
		types[i] = R;
	}
    }

    /* Rule (I1)
     * I1. For all characters with an even (left-to-right) embedding
     * direction, those of type R go up one level and those of type AN or
     * EN go up two levels.
     */
    for (i = 0; i < count; i++) {
	if ((levels[i] % 2) == 0) {
	    if (types[i] == R)
		levels[i] += 1;
	    else if (types[i] == AN || types[i] == EN)
		levels[i] += 2;
	}
    }

    /* Rule (I2)
     * I2. For all characters with an odd (right-to-left) embedding direction,
     * those of type L, EN or AN go up one level.
     */
    for (i = 0; i < count; i++) {
	if ((levels[i] % 2) == 1) {
	    if (types[i] == L || types[i] == EN || types[i] == AN)
		levels[i] += 1;
	}
    }

    /* Rule (L1)
     * L1. On each line, reset the embedding level of the following characters
     * to the paragraph embedding level:
     *          (1)segment separators, (2)paragraph separators,
     *           (3)any sequence of whitespace characters preceding
     *           a segment separator or paragraph separator,
     *           (4)and any sequence of white space characters
     *           at the end of the line.
     * The types of characters used here are the original types, not those
     * modified by the previous phase.
     */
    j = count - 1;
    while (j > 0 && (getType(line[j].wc) == WS)) {
	j--;
    }
    if (j < (count - 1)) {
	for (j++; j < count; j++)
	    levels[j] = paragraphLevel;
    }
    for (i = 0; i < count; i++) {
	tempType = getType(line[i].wc);
	if (tempType == WS) {
	    j = i;
	    while (j < count && (getType(line[j].wc) == WS)) {
		j++;
	    }
	    if (j == count || getType(line[j].wc) == B ||
		getType(line[j].wc) == S) {
		for (j--; j >= i; j--) {
		    levels[j] = paragraphLevel;
		}
	    }
	} else if (tempType == B || tempType == S) {
	    levels[i] = paragraphLevel;
	}
    }

    /* Rule (L4) NOT IMPLEMENTED
     * L4. A character that possesses the mirrored property as specified by
     * Section 4.7, Mirrored, must be depicted by a mirrored glyph if the
     * resolved directionality of that character is R.
     */
    /* Note: this is implemented before L2 for efficiency */
    for (i = 0; i < count; i++)
	if ((levels[i] % 2) == 1)
	    doMirror(&line[i].wc);

    /* Rule (L2)
     * L2. From the highest level found in the text to the lowest odd level on
     * each line, including intermediate levels not actually present in the
     * text, reverse any contiguous sequence of characters that are at that
     * level or higher
     */
    /* we flip the character string and leave the level array */
    imax = 0;
    i = 0;
    tempType = levels[0];
    while (i < count) {
	if (levels[i] > tempType) {
	    tempType = levels[i];
	    imax = i;
	}
	i++;
    }
    /* maximum level in tempType, its index in imax. */
    while (tempType > 0) {	/* loop from highest level to the least odd, */
	/* which i assume is 1 */
	flipThisRun(line, levels, tempType, count);
	tempType--;
    }

    /* Rule (L3) NOT IMPLEMENTED
     * L3. Combining marks applied to a right-to-left base character will at
     * this point precede their base character. If the rendering engine
     * expects them to follow the base characters in the final display
     * process, then the ordering of the marks and the base character must
     * be reversed.
     */
    sfree(types);
    sfree(levels);
    return R;
}


/*
 * Bad, Horrible function
 * takes a pointer to a character that is checked for
 * having a mirror glyph.
 */
void doMirror(wchar_t * ch)
{
    if ((*ch & 0xFF00) == 0) {
	switch (*ch) {
	case 0x0028:
	    *ch = 0x0029;
	    break;
	case 0x0029:
	    *ch = 0x0028;
	    break;
	case 0x003C:
	    *ch = 0x003E;
	    break;
	case 0x003E:
	    *ch = 0x003C;
	    break;
	case 0x005B:
	    *ch = 0x005D;
	    break;
	case 0x005D:
	    *ch = 0x005B;
	    break;
	case 0x007B:
	    *ch = 0x007D;
	    break;
	case 0x007D:
	    *ch = 0x007B;
	    break;
	case 0x00AB:
	    *ch = 0x00BB;
	    break;
	case 0x00BB:
	    *ch = 0x00AB;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2000) {
	switch (*ch) {
	case 0x2039:
	    *ch = 0x203A;
	    break;
	case 0x203A:
	    *ch = 0x2039;
	    break;
	case 0x2045:
	    *ch = 0x2046;
	    break;
	case 0x2046:
	    *ch = 0x2045;
	    break;
	case 0x207D:
	    *ch = 0x207E;
	    break;
	case 0x207E:
	    *ch = 0x207D;
	    break;
	case 0x208D:
	    *ch = 0x208E;
	    break;
	case 0x208E:
	    *ch = 0x208D;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2200) {
	switch (*ch) {
	case 0x2208:
	    *ch = 0x220B;
	    break;
	case 0x2209:
	    *ch = 0x220C;
	    break;
	case 0x220A:
	    *ch = 0x220D;
	    break;
	case 0x220B:
	    *ch = 0x2208;
	    break;
	case 0x220C:
	    *ch = 0x2209;
	    break;
	case 0x220D:
	    *ch = 0x220A;
	    break;
	case 0x2215:
	    *ch = 0x29F5;
	    break;
	case 0x223C:
	    *ch = 0x223D;
	    break;
	case 0x223D:
	    *ch = 0x223C;
	    break;
	case 0x2243:
	    *ch = 0x22CD;
	    break;
	case 0x2252:
	    *ch = 0x2253;
	    break;
	case 0x2253:
	    *ch = 0x2252;
	    break;
	case 0x2254:
	    *ch = 0x2255;
	    break;
	case 0x2255:
	    *ch = 0x2254;
	    break;
	case 0x2264:
	    *ch = 0x2265;
	    break;
	case 0x2265:
	    *ch = 0x2264;
	    break;
	case 0x2266:
	    *ch = 0x2267;
	    break;
	case 0x2267:
	    *ch = 0x2266;
	    break;
	case 0x2268:
	    *ch = 0x2269;
	    break;
	case 0x2269:
	    *ch = 0x2268;
	    break;
	case 0x226A:
	    *ch = 0x226B;
	    break;
	case 0x226B:
	    *ch = 0x226A;
	    break;
	case 0x226E:
	    *ch = 0x226F;
	    break;
	case 0x226F:
	    *ch = 0x226E;
	    break;
	case 0x2270:
	    *ch = 0x2271;
	    break;
	case 0x2271:
	    *ch = 0x2270;
	    break;
	case 0x2272:
	    *ch = 0x2273;
	    break;
	case 0x2273:
	    *ch = 0x2272;
	    break;
	case 0x2274:
	    *ch = 0x2275;
	    break;
	case 0x2275:
	    *ch = 0x2274;
	    break;
	case 0x2276:
	    *ch = 0x2277;
	    break;
	case 0x2277:
	    *ch = 0x2276;
	    break;
	case 0x2278:
	    *ch = 0x2279;
	    break;
	case 0x2279:
	    *ch = 0x2278;
	    break;
	case 0x227A:
	    *ch = 0x227B;
	    break;
	case 0x227B:
	    *ch = 0x227A;
	    break;
	case 0x227C:
	    *ch = 0x227D;
	    break;
	case 0x227D:
	    *ch = 0x227C;
	    break;
	case 0x227E:
	    *ch = 0x227F;
	    break;
	case 0x227F:
	    *ch = 0x227E;
	    break;
	case 0x2280:
	    *ch = 0x2281;
	    break;
	case 0x2281:
	    *ch = 0x2280;
	    break;
	case 0x2282:
	    *ch = 0x2283;
	    break;
	case 0x2283:
	    *ch = 0x2282;
	    break;
	case 0x2284:
	    *ch = 0x2285;
	    break;
	case 0x2285:
	    *ch = 0x2284;
	    break;
	case 0x2286:
	    *ch = 0x2287;
	    break;
	case 0x2287:
	    *ch = 0x2286;
	    break;
	case 0x2288:
	    *ch = 0x2289;
	    break;
	case 0x2289:
	    *ch = 0x2288;
	    break;
	case 0x228A:
	    *ch = 0x228B;
	    break;
	case 0x228B:
	    *ch = 0x228A;
	    break;
	case 0x228F:
	    *ch = 0x2290;
	    break;
	case 0x2290:
	    *ch = 0x228F;
	    break;
	case 0x2291:
	    *ch = 0x2292;
	    break;
	case 0x2292:
	    *ch = 0x2291;
	    break;
	case 0x2298:
	    *ch = 0x29B8;
	    break;
	case 0x22A2:
	    *ch = 0x22A3;
	    break;
	case 0x22A3:
	    *ch = 0x22A2;
	    break;
	case 0x22A6:
	    *ch = 0x2ADE;
	    break;
	case 0x22A8:
	    *ch = 0x2AE4;
	    break;
	case 0x22A9:
	    *ch = 0x2AE3;
	    break;
	case 0x22AB:
	    *ch = 0x2AE5;
	    break;
	case 0x22B0:
	    *ch = 0x22B1;
	    break;
	case 0x22B1:
	    *ch = 0x22B0;
	    break;
	case 0x22B2:
	    *ch = 0x22B3;
	    break;
	case 0x22B3:
	    *ch = 0x22B2;
	    break;
	case 0x22B4:
	    *ch = 0x22B5;
	    break;
	case 0x22B5:
	    *ch = 0x22B4;
	    break;
	case 0x22B6:
	    *ch = 0x22B7;
	    break;
	case 0x22B7:
	    *ch = 0x22B6;
	    break;
	case 0x22C9:
	    *ch = 0x22CA;
	    break;
	case 0x22CA:
	    *ch = 0x22C9;
	    break;
	case 0x22CB:
	    *ch = 0x22CC;
	    break;
	case 0x22CC:
	    *ch = 0x22CB;
	    break;
	case 0x22CD:
	    *ch = 0x2243;
	    break;
	case 0x22D0:
	    *ch = 0x22D1;
	    break;
	case 0x22D1:
	    *ch = 0x22D0;
	    break;
	case 0x22D6:
	    *ch = 0x22D7;
	    break;
	case 0x22D7:
	    *ch = 0x22D6;
	    break;
	case 0x22D8:
	    *ch = 0x22D9;
	    break;
	case 0x22D9:
	    *ch = 0x22D8;
	    break;
	case 0x22DA:
	    *ch = 0x22DB;
	    break;
	case 0x22DB:
	    *ch = 0x22DA;
	    break;
	case 0x22DC:
	    *ch = 0x22DD;
	    break;
	case 0x22DD:
	    *ch = 0x22DC;
	    break;
	case 0x22DE:
	    *ch = 0x22DF;
	    break;
	case 0x22DF:
	    *ch = 0x22DE;
	    break;
	case 0x22E0:
	    *ch = 0x22E1;
	    break;
	case 0x22E1:
	    *ch = 0x22E0;
	    break;
	case 0x22E2:
	    *ch = 0x22E3;
	    break;
	case 0x22E3:
	    *ch = 0x22E2;
	    break;
	case 0x22E4:
	    *ch = 0x22E5;
	    break;
	case 0x22E5:
	    *ch = 0x22E4;
	    break;
	case 0x22E6:
	    *ch = 0x22E7;
	    break;
	case 0x22E7:
	    *ch = 0x22E6;
	    break;
	case 0x22E8:
	    *ch = 0x22E9;
	    break;
	case 0x22E9:
	    *ch = 0x22E8;
	    break;
	case 0x22EA:
	    *ch = 0x22EB;
	    break;
	case 0x22EB:
	    *ch = 0x22EA;
	    break;
	case 0x22EC:
	    *ch = 0x22ED;
	    break;
	case 0x22ED:
	    *ch = 0x22EC;
	    break;
	case 0x22F0:
	    *ch = 0x22F1;
	    break;
	case 0x22F1:
	    *ch = 0x22F0;
	    break;
	case 0x22F2:
	    *ch = 0x22FA;
	    break;
	case 0x22F3:
	    *ch = 0x22FB;
	    break;
	case 0x22F4:
	    *ch = 0x22FC;
	    break;
	case 0x22F6:
	    *ch = 0x22FD;
	    break;
	case 0x22F7:
	    *ch = 0x22FE;
	    break;
	case 0x22FA:
	    *ch = 0x22F2;
	    break;
	case 0x22FB:
	    *ch = 0x22F3;
	    break;
	case 0x22FC:
	    *ch = 0x22F4;
	    break;
	case 0x22FD:
	    *ch = 0x22F6;
	    break;
	case 0x22FE:
	    *ch = 0x22F7;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2300) {
	switch (*ch) {
	case 0x2308:
	    *ch = 0x2309;
	    break;
	case 0x2309:
	    *ch = 0x2308;
	    break;
	case 0x230A:
	    *ch = 0x230B;
	    break;
	case 0x230B:
	    *ch = 0x230A;
	    break;
	case 0x2329:
	    *ch = 0x232A;
	    break;
	case 0x232A:
	    *ch = 0x2329;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2700) {
	switch (*ch) {
	case 0x2768:
	    *ch = 0x2769;
	    break;
	case 0x2769:
	    *ch = 0x2768;
	    break;
	case 0x276A:
	    *ch = 0x276B;
	    break;
	case 0x276B:
	    *ch = 0x276A;
	    break;
	case 0x276C:
	    *ch = 0x276D;
	    break;
	case 0x276D:
	    *ch = 0x276C;
	    break;
	case 0x276E:
	    *ch = 0x276F;
	    break;
	case 0x276F:
	    *ch = 0x276E;
	    break;
	case 0x2770:
	    *ch = 0x2771;
	    break;
	case 0x2771:
	    *ch = 0x2770;
	    break;
	case 0x2772:
	    *ch = 0x2773;
	    break;
	case 0x2773:
	    *ch = 0x2772;
	    break;
	case 0x2774:
	    *ch = 0x2775;
	    break;
	case 0x2775:
	    *ch = 0x2774;
	    break;
	case 0x27D5:
	    *ch = 0x27D6;
	    break;
	case 0x27D6:
	    *ch = 0x27D5;
	    break;
	case 0x27DD:
	    *ch = 0x27DE;
	    break;
	case 0x27DE:
	    *ch = 0x27DD;
	    break;
	case 0x27E2:
	    *ch = 0x27E3;
	    break;
	case 0x27E3:
	    *ch = 0x27E2;
	    break;
	case 0x27E4:
	    *ch = 0x27E5;
	    break;
	case 0x27E5:
	    *ch = 0x27E4;
	    break;
	case 0x27E6:
	    *ch = 0x27E7;
	    break;
	case 0x27E7:
	    *ch = 0x27E6;
	    break;
	case 0x27E8:
	    *ch = 0x27E9;
	    break;
	case 0x27E9:
	    *ch = 0x27E8;
	    break;
	case 0x27EA:
	    *ch = 0x27EB;
	    break;
	case 0x27EB:
	    *ch = 0x27EA;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2900) {
	switch (*ch) {
	case 0x2983:
	    *ch = 0x2984;
	    break;
	case 0x2984:
	    *ch = 0x2983;
	    break;
	case 0x2985:
	    *ch = 0x2986;
	    break;
	case 0x2986:
	    *ch = 0x2985;
	    break;
	case 0x2987:
	    *ch = 0x2988;
	    break;
	case 0x2988:
	    *ch = 0x2987;
	    break;
	case 0x2989:
	    *ch = 0x298A;
	    break;
	case 0x298A:
	    *ch = 0x2989;
	    break;
	case 0x298B:
	    *ch = 0x298C;
	    break;
	case 0x298C:
	    *ch = 0x298B;
	    break;
	case 0x298D:
	    *ch = 0x2990;
	    break;
	case 0x298E:
	    *ch = 0x298F;
	    break;
	case 0x298F:
	    *ch = 0x298E;
	    break;
	case 0x2990:
	    *ch = 0x298D;
	    break;
	case 0x2991:
	    *ch = 0x2992;
	    break;
	case 0x2992:
	    *ch = 0x2991;
	    break;
	case 0x2993:
	    *ch = 0x2994;
	    break;
	case 0x2994:
	    *ch = 0x2993;
	    break;
	case 0x2995:
	    *ch = 0x2996;
	    break;
	case 0x2996:
	    *ch = 0x2995;
	    break;
	case 0x2997:
	    *ch = 0x2998;
	    break;
	case 0x2998:
	    *ch = 0x2997;
	    break;
	case 0x29B8:
	    *ch = 0x2298;
	    break;
	case 0x29C0:
	    *ch = 0x29C1;
	    break;
	case 0x29C1:
	    *ch = 0x29C0;
	    break;
	case 0x29C4:
	    *ch = 0x29C5;
	    break;
	case 0x29C5:
	    *ch = 0x29C4;
	    break;
	case 0x29CF:
	    *ch = 0x29D0;
	    break;
	case 0x29D0:
	    *ch = 0x29CF;
	    break;
	case 0x29D1:
	    *ch = 0x29D2;
	    break;
	case 0x29D2:
	    *ch = 0x29D1;
	    break;
	case 0x29D4:
	    *ch = 0x29D5;
	    break;
	case 0x29D5:
	    *ch = 0x29D4;
	    break;
	case 0x29D8:
	    *ch = 0x29D9;
	    break;
	case 0x29D9:
	    *ch = 0x29D8;
	    break;
	case 0x29DA:
	    *ch = 0x29DB;
	    break;
	case 0x29DB:
	    *ch = 0x29DA;
	    break;
	case 0x29F5:
	    *ch = 0x2215;
	    break;
	case 0x29F8:
	    *ch = 0x29F9;
	    break;
	case 0x29F9:
	    *ch = 0x29F8;
	    break;
	case 0x29FC:
	    *ch = 0x29FD;
	    break;
	case 0x29FD:
	    *ch = 0x29FC;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x2A00) {
	switch (*ch) {
	case 0x2A2B:
	    *ch = 0x2A2C;
	    break;
	case 0x2A2C:
	    *ch = 0x2A2B;
	    break;
	case 0x2A2D:
	    *ch = 0x2A2C;
	    break;
	case 0x2A2E:
	    *ch = 0x2A2D;
	    break;
	case 0x2A34:
	    *ch = 0x2A35;
	    break;
	case 0x2A35:
	    *ch = 0x2A34;
	    break;
	case 0x2A3C:
	    *ch = 0x2A3D;
	    break;
	case 0x2A3D:
	    *ch = 0x2A3C;
	    break;
	case 0x2A64:
	    *ch = 0x2A65;
	    break;
	case 0x2A65:
	    *ch = 0x2A64;
	    break;
	case 0x2A79:
	    *ch = 0x2A7A;
	    break;
	case 0x2A7A:
	    *ch = 0x2A79;
	    break;
	case 0x2A7D:
	    *ch = 0x2A7E;
	    break;
	case 0x2A7E:
	    *ch = 0x2A7D;
	    break;
	case 0x2A7F:
	    *ch = 0x2A80;
	    break;
	case 0x2A80:
	    *ch = 0x2A7F;
	    break;
	case 0x2A81:
	    *ch = 0x2A82;
	    break;
	case 0x2A82:
	    *ch = 0x2A81;
	    break;
	case 0x2A83:
	    *ch = 0x2A84;
	    break;
	case 0x2A84:
	    *ch = 0x2A83;
	    break;
	case 0x2A8B:
	    *ch = 0x2A8C;
	    break;
	case 0x2A8C:
	    *ch = 0x2A8B;
	    break;
	case 0x2A91:
	    *ch = 0x2A92;
	    break;
	case 0x2A92:
	    *ch = 0x2A91;
	    break;
	case 0x2A93:
	    *ch = 0x2A94;
	    break;
	case 0x2A94:
	    *ch = 0x2A93;
	    break;
	case 0x2A95:
	    *ch = 0x2A96;
	    break;
	case 0x2A96:
	    *ch = 0x2A95;
	    break;
	case 0x2A97:
	    *ch = 0x2A98;
	    break;
	case 0x2A98:
	    *ch = 0x2A97;
	    break;
	case 0x2A99:
	    *ch = 0x2A9A;
	    break;
	case 0x2A9A:
	    *ch = 0x2A99;
	    break;
	case 0x2A9B:
	    *ch = 0x2A9C;
	    break;
	case 0x2A9C:
	    *ch = 0x2A9B;
	    break;
	case 0x2AA1:
	    *ch = 0x2AA2;
	    break;
	case 0x2AA2:
	    *ch = 0x2AA1;
	    break;
	case 0x2AA6:
	    *ch = 0x2AA7;
	    break;
	case 0x2AA7:
	    *ch = 0x2AA6;
	    break;
	case 0x2AA8:
	    *ch = 0x2AA9;
	    break;
	case 0x2AA9:
	    *ch = 0x2AA8;
	    break;
	case 0x2AAA:
	    *ch = 0x2AAB;
	    break;
	case 0x2AAB:
	    *ch = 0x2AAA;
	    break;
	case 0x2AAC:
	    *ch = 0x2AAD;
	    break;
	case 0x2AAD:
	    *ch = 0x2AAC;
	    break;
	case 0x2AAF:
	    *ch = 0x2AB0;
	    break;
	case 0x2AB0:
	    *ch = 0x2AAF;
	    break;
	case 0x2AB3:
	    *ch = 0x2AB4;
	    break;
	case 0x2AB4:
	    *ch = 0x2AB3;
	    break;
	case 0x2ABB:
	    *ch = 0x2ABC;
	    break;
	case 0x2ABC:
	    *ch = 0x2ABB;
	    break;
	case 0x2ABD:
	    *ch = 0x2ABE;
	    break;
	case 0x2ABE:
	    *ch = 0x2ABD;
	    break;
	case 0x2ABF:
	    *ch = 0x2AC0;
	    break;
	case 0x2AC0:
	    *ch = 0x2ABF;
	    break;
	case 0x2AC1:
	    *ch = 0x2AC2;
	    break;
	case 0x2AC2:
	    *ch = 0x2AC1;
	    break;
	case 0x2AC3:
	    *ch = 0x2AC4;
	    break;
	case 0x2AC4:
	    *ch = 0x2AC3;
	    break;
	case 0x2AC5:
	    *ch = 0x2AC6;
	    break;
	case 0x2AC6:
	    *ch = 0x2AC5;
	    break;
	case 0x2ACD:
	    *ch = 0x2ACE;
	    break;
	case 0x2ACE:
	    *ch = 0x2ACD;
	    break;
	case 0x2ACF:
	    *ch = 0x2AD0;
	    break;
	case 0x2AD0:
	    *ch = 0x2ACF;
	    break;
	case 0x2AD1:
	    *ch = 0x2AD2;
	    break;
	case 0x2AD2:
	    *ch = 0x2AD1;
	    break;
	case 0x2AD3:
	    *ch = 0x2AD4;
	    break;
	case 0x2AD4:
	    *ch = 0x2AD3;
	    break;
	case 0x2AD5:
	    *ch = 0x2AD6;
	    break;
	case 0x2AD6:
	    *ch = 0x2AD5;
	    break;
	case 0x2ADE:
	    *ch = 0x22A6;
	    break;
	case 0x2AE3:
	    *ch = 0x22A9;
	    break;
	case 0x2AE4:
	    *ch = 0x22A8;
	    break;
	case 0x2AE5:
	    *ch = 0x22AB;
	    break;
	case 0x2AEC:
	    *ch = 0x2AED;
	    break;
	case 0x2AED:
	    *ch = 0x2AEC;
	    break;
	case 0x2AF7:
	    *ch = 0x2AF8;
	    break;
	case 0x2AF8:
	    *ch = 0x2AF7;
	    break;
	case 0x2AF9:
	    *ch = 0x2AFA;
	    break;
	case 0x2AFA:
	    *ch = 0x2AF9;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0x3000) {
	switch (*ch) {
	case 0x3008:
	    *ch = 0x3009;
	    break;
	case 0x3009:
	    *ch = 0x3008;
	    break;
	case 0x300A:
	    *ch = 0x300B;
	    break;
	case 0x300B:
	    *ch = 0x300A;
	    break;
	case 0x300C:
	    *ch = 0x300D;
	    break;
	case 0x300D:
	    *ch = 0x300C;
	    break;
	case 0x300E:
	    *ch = 0x300F;
	    break;
	case 0x300F:
	    *ch = 0x300E;
	    break;
	case 0x3010:
	    *ch = 0x3011;
	    break;
	case 0x3011:
	    *ch = 0x3010;
	    break;
	case 0x3014:
	    *ch = 0x3015;
	    break;
	case 0x3015:
	    *ch = 0x3014;
	    break;
	case 0x3016:
	    *ch = 0x3017;
	    break;
	case 0x3017:
	    *ch = 0x3016;
	    break;
	case 0x3018:
	    *ch = 0x3019;
	    break;
	case 0x3019:
	    *ch = 0x3018;
	    break;
	case 0x301A:
	    *ch = 0x301B;
	    break;
	case 0x301B:
	    *ch = 0x301A;
	    break;
	}
    } else if ((*ch & 0xFF00) == 0xFF00) {
	switch (*ch) {
	case 0xFF08:
	    *ch = 0xFF09;
	    break;
	case 0xFF09:
	    *ch = 0xFF08;
	    break;
	case 0xFF1C:
	    *ch = 0xFF1E;
	    break;
	case 0xFF1E:
	    *ch = 0xFF1C;
	    break;
	case 0xFF3B:
	    *ch = 0xFF3D;
	    break;
	case 0xFF3D:
	    *ch = 0xFF3B;
	    break;
	case 0xFF5B:
	    *ch = 0xFF5D;
	    break;
	case 0xFF5D:
	    *ch = 0xFF5B;
	    break;
	case 0xFF5F:
	    *ch = 0xFF60;
	    break;
	case 0xFF60:
	    *ch = 0xFF5F;
	    break;
	case 0xFF62:
	    *ch = 0xFF63;
	    break;
	case 0xFF63:
	    *ch = 0xFF62;
	    break;
	}
    }
}

#ifdef TEST_GETTYPE

#include <stdio.h>
#include <assert.h>

int main(int argc, char **argv)
{
    static const struct {
	int type;
	char *name;
    } typetoname[] = {
#define TYPETONAME(X) { X , #X }
	TYPETONAME(L),
	    TYPETONAME(LRE),
	    TYPETONAME(LRO),
	    TYPETONAME(R),
	    TYPETONAME(AL),
	    TYPETONAME(RLE),
	    TYPETONAME(RLO),
	    TYPETONAME(PDF),
	    TYPETONAME(EN),
	    TYPETONAME(ES),
	    TYPETONAME(ET),
	    TYPETONAME(AN),
	    TYPETONAME(CS),
	    TYPETONAME(NSM),
	    TYPETONAME(BN),
	    TYPETONAME(B), TYPETONAME(S), TYPETONAME(WS), TYPETONAME(ON),
#undef TYPETONAME
    };
    int i;

    for (i = 1; i < argc; i++) {
	unsigned long chr = strtoul(argv[i], NULL, 0);
	int type = getType(chr);
	assert(typetoname[type].type == type);
	printf("U+%04x: %s\n", chr, typetoname[type].name);
    }

    return 0;
}

#endif
