fontforge/fontforge/parsettfatt.c

/* Copyright (C) 2000-2008 by George Williams */
/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.

 * The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "pfaedit.h"
#include <chardata.h>
#include <utype.h>
#include <ustring.h>
#include <math.h>
#include <locale.h>
#include <stdlib.h>
#include "ttf.h"

static uint16 *getAppleClassTable(FILE *ttf, int classdef_offset, int cnt, int sub, int div, struct ttfinfo *info) {
    uint16 *class = gcalloc(cnt,sizeof(uint16));
    int first, i, n;
    /* Apple stores its class tables as containing offsets. I find it hard to */
    /*  think that way and convert them to indeces (by subtracting off a base */
    /*  offset and dividing by the item's size) before doing anything else */

    fseek(ttf,classdef_offset,SEEK_SET);
    first = getushort(ttf);
    n = getushort(ttf);
    if ( first+n-1>=cnt ) {
	LogError( _("Bad Apple Kern Class\n") );
	info->bad_gx = true;
    }
    for ( i=0; i<n && i+first<cnt; ++i )
	class[first+i] = (getushort(ttf)-sub)/div;
return( class );
}

static char **ClassToNames(struct ttfinfo *info,int class_cnt,uint16 *class,int glyph_cnt) {
    char **ret = galloc(class_cnt*sizeof(char *));
    int *lens = gcalloc(class_cnt,sizeof(int));
    int i;

    ret[0] = NULL;
    for ( i=0 ; i<glyph_cnt; ++i ) if ( class[i]!=0 && info->chars[i]!=NULL && class[i]<class_cnt )
	lens[class[i]] += strlen(info->chars[i]->name)+1;
    for ( i=1; i<class_cnt ; ++i )
	ret[i] = galloc(lens[i]+1);
    memset(lens,0,class_cnt*sizeof(int));
    for ( i=0 ; i<glyph_cnt; ++i ) if ( class[i]!=0 && info->chars[i]!=NULL ) {
	if ( class[i]<class_cnt ) {
	    strcpy(ret[class[i]]+lens[class[i]], info->chars[i]->name );
	    lens[class[i]] += strlen(info->chars[i]->name)+1;
	    ret[class[i]][lens[class[i]]-1] = ' ';
	} else {
	    LogError( _("Class index out of range %d (must be <%d)\n"),class[i], class_cnt );
	    info->bad_ot = true;
	}
    }
    for ( i=1; i<class_cnt ; ++i )
	if ( lens[i]==0 )
	    ret[i][0] = '\0';
	else
	    ret[i][lens[i]-1] = '\0';
    free(lens);
return( ret );
}

static char *CoverageMinusClasses(uint16 *coverageglyphs,uint16 *classed,
	struct ttfinfo *info ) {
    int i, j, len;
    uint8 *glyphs = gcalloc(info->glyph_cnt,1);
    char *ret;

    for ( i=0; coverageglyphs[i]!=0xffff; ++i )
	glyphs[coverageglyphs[i]] = 1;
    for ( i=0; i<info->glyph_cnt; ++i )
	if ( classed[i]!=0 )
	    glyphs[i] = 0;
    for ( i=0; i<info->glyph_cnt; ++i )
	if ( glyphs[i]!=0 )
    break;
    /* coverage table matches glyphs in classes. No need for special treatment*/
    if ( i==info->glyph_cnt ) {
	free(glyphs);
return( NULL );
    }
    /* Otherwise we need to generate a class string of glyph names in the coverage */
    /*  table but not in any class. These become the glyphs in class 0 */
    ret = NULL;
    for ( j=0; j<2; ++j ) {
	len = 0;
	for ( i=0; i<info->glyph_cnt; ++i ) {
	    if ( glyphs[i]!=0 ) {
		if ( j ) {
		    strcpy( ret+len, info->chars[i]->name );
		    strcat( ret+len, " ");
		}
		len += strlen(info->chars[i]->name)+1;
	    }
	}
	if ( j==0 )
	    ret = galloc(len+1);
	else
	    ret[len-1] = '\0';
    }
    free(glyphs);
return( ret );
}

static int ClassFindCnt(uint16 *class,int tot) {
    int i, max=0;

    for ( i=0; i<tot; ++i )
	if ( class[i]>max ) max = class[i];
return( max+1 );
}

static int cmpuint16(const void *u1, const void *u2) {
return( ((int) *((const uint16 *) u1)) - ((int) *((const uint16 *) u2)) );
}

static char *GlyphsToNames(struct ttfinfo *info,uint16 *glyphs,int make_uniq) {
    int i, j, len, off;
    char *ret, *pt;

    if ( glyphs==NULL )
return( copy(""));

    /* Adobe produces coverage tables containing duplicate glyphs in */
    /*  GaramondPremrPro.otf. We want unique glyphs, so enforce that */
    if ( make_uniq ) {
	for ( i=0 ; glyphs[i]!=0xffff; ++i );
	qsort(glyphs,i,sizeof(uint16),cmpuint16);
	for ( i=0; glyphs[i]!=0xffff; ++i ) {
	    if ( glyphs[i+1]==glyphs[i] ) {
		for ( j=i+1; glyphs[j]==glyphs[i]; ++j );
		off = j-i -1;
		for ( j=i+1; ; ++j ) {
		    glyphs[j] = glyphs[j+off];
		    if ( glyphs[j]==0xffff )
		break;
		}
	    }
	}
    }

    for ( i=len=0 ; glyphs[i]!=0xffff; ++i )
	if ( info->chars[glyphs[i]]!=NULL )
	    len += strlen(info->chars[glyphs[i]]->name)+1;
    ret = pt = galloc(len+1); *pt = '\0';
    for ( i=0 ; glyphs[i]!=0xffff; ++i ) if ( info->chars[glyphs[i]]!=NULL ) {
	strcpy(pt,info->chars[glyphs[i]]->name);
	pt += strlen(pt);
	*pt++ = ' ';
    }
    if ( pt>ret ) pt[-1] = '\0';
return( ret );
}

struct scripts {
    uint32 offset;
    uint32 tag;
    int langcnt;		/* the default language is included as a */
    struct language {		/* normal entry with lang tag 'dflt' */
	uint32 tag;
	uint32 offset;
	uint16 req;		/* required feature index. 0xffff for null */
	int fcnt;
	uint16 *features;
    } *languages;
};

struct feature {
    uint32 offset;
    uint32 tag;
    int lcnt;
    uint16 *lookups;
};

struct lookup {
    uint16 type;
    uint16 flags;
    /* uint16 lookup; */	/* ???? can't imagine what this is*/
    uint32 offset;
    int subtabcnt;
    int32 *subtab_offsets;
    OTLookup *otlookup;
};

static uint16 *getCoverageTable(FILE *ttf, int coverage_offset, struct ttfinfo *info) {
    int format, cnt, i,j, rcnt;
    uint16 *glyphs=NULL;
    int start, end, ind, max;

    fseek(ttf,coverage_offset,SEEK_SET);
    format = getushort(ttf);
    if ( format==1 ) {
	cnt = getushort(ttf);
	glyphs = galloc((cnt+1)*sizeof(uint16));
	if ( ftell(ttf)+2*cnt > info->g_bounds ) {
	    LogError( _("coverage table extends beyond end of table\n") );
	    info->bad_ot = true;
	    if ( ftell(ttf)>info->g_bounds )
return( NULL );
	    cnt = (info->g_bounds-ftell(ttf))/2;
	}
	for ( i=0; i<cnt; ++i ) {
	    if ( cnt&0xffff0000 ) {
		LogError( _("Bad count.\n"));
		info->bad_ot = true;
	    }
	    glyphs[i] = getushort(ttf);
	    if ( feof(ttf) ) {
		LogError( _("End of file found in coverage table.\n") );
		info->bad_ot = true;
		free(glyphs);
return( NULL );
	    }
	    if ( glyphs[i]>=info->glyph_cnt ) {
		LogError( _("Bad coverage table. Glyph %d out of range [0,%d)\n"), glyphs[i], info->glyph_cnt );
		info->bad_ot = true;
		glyphs[i] = 0;
	    }
	}
    } else if ( format==2 ) {
	glyphs = gcalloc((max=256),sizeof(uint16));
	rcnt = getushort(ttf); cnt = 0;
	if ( ftell(ttf)+6*rcnt > info->g_bounds ) {
	    LogError( _("coverage table extends beyond end of table\n") );
	    info->bad_ot = true;
	    rcnt = (info->g_bounds-ftell(ttf))/6;
	}

	for ( i=0; i<rcnt; ++i ) {
	    start = getushort(ttf);
	    end = getushort(ttf);
	    ind = getushort(ttf);
	    if ( feof(ttf) ) {
		LogError( _("End of file found in coverage table.\n") );
		info->bad_ot = true;
		free(glyphs);
return( NULL );
	    }
	    if ( start>end || end>=info->glyph_cnt ) {
		LogError( _("Bad coverage table. Glyph range %d-%d out of range [0,%d)\n"), start, end, info->glyph_cnt );
		info->bad_ot = true;
		start = end = 0;
	    }
	    if ( ind+end-start+2 >= max ) {
		int oldmax = max;
		max = ind+end-start+2;
		glyphs = grealloc(glyphs,max*sizeof(uint16));
		memset(glyphs+oldmax,0,(max-oldmax)*sizeof(uint16));
	    }
	    for ( j=start; j<=end; ++j ) {
		glyphs[j-start+ind] = j;
		if ( j>=info->glyph_cnt )
		    glyphs[j-start+ind] = 0;
	    }
	    if ( ind+end-start+1>cnt )
		cnt = ind+end-start+1;
	}
    } else {
	LogError( _("Bad format for coverage table %d\n"), format );
	info->bad_ot = true;
return( NULL );
    }
    glyphs[cnt] = 0xffff;

return( glyphs );
}

struct valuerecord {
    int16 xplacement, yplacement;
    int16 xadvance, yadvance;
    uint16 offXplaceDev, offYplaceDev;
    uint16 offXadvanceDev, offYadvanceDev;
};

static uint16 *getClassDefTable(FILE *ttf, int classdef_offset, struct ttfinfo *info) {
    int format, i, j;
    uint16 start, glyphcnt, rangecnt, end, class;
    uint16 *glist=NULL;
    int warned = false;
    int cnt = info->glyph_cnt;
    uint32 g_bounds = info->g_bounds;

    fseek(ttf, classdef_offset, SEEK_SET);
    glist = gcalloc(cnt,sizeof(uint16));	/* Class 0 is default */
    format = getushort(ttf);
    if ( format==1 ) {
	start = getushort(ttf);
	glyphcnt = getushort(ttf);
	if ( start+(int) glyphcnt>cnt ) {
	    LogError( _("Bad class def table. start=%d cnt=%d, max glyph=%d\n"), start, glyphcnt, cnt );
	    info->bad_ot = true;
	    glyphcnt = cnt-start;
	} else if ( ftell(ttf)+2*glyphcnt > g_bounds ) {
	    LogError( _("Class definition sub-table extends beyond end of table\n") );
	    info->bad_ot = true;
        if (g_bounds<ftell(ttf))
            glyphcnt = 0;
	    else
            glyphcnt = (g_bounds-ftell(ttf))/2;
	}
	for ( i=0; i<glyphcnt; ++i )
	    glist[start+i] = getushort(ttf);
    } else if ( format==2 ) {
	rangecnt = getushort(ttf);
	if ( ftell(ttf)+6*rangecnt > g_bounds ) {
	    LogError( _("Class definition sub-table extends beyond end of table\n") );
	    info->bad_ot = true;
	    rangecnt = (g_bounds-ftell(ttf))/6;
	}
	for ( i=0; i<rangecnt; ++i ) {
	    start = getushort(ttf);
	    end = getushort(ttf);
	    if ( start>end || end>=cnt ) {
		LogError( _("Bad class def table. Glyph range %d-%d out of range [0,%d)\n"), start, end, cnt );
		info->bad_ot = true;
	    }
	    class = getushort(ttf);
	    for ( j=start; j<=end; ++j ) if ( j<cnt )
		glist[j] = class;
	}
    } else {
	LogError( _("Unknown class table format: %d\n"), format );
	info->bad_ot = true;
    }

    /* Do another validity test */
    for ( i=0; i<cnt; ++i ) {
	if ( glist[i]>=cnt+1 ) {
	    if ( !warned ) {
		LogError( _("Nonsensical class assigned to a glyph-- class=%d is too big. Glyph=%d\n"),
			glist[i], i );
		info->bad_ot = true;
		warned = true;
	    }
	    glist[i] = 0;
	}
    }

return glist;
}

static void readvaluerecord(struct valuerecord *vr,int vf,FILE *ttf) {
    memset(vr,'\0',sizeof(struct valuerecord));
    if ( vf&1 )
	vr->xplacement = getushort(ttf);
    if ( vf&2 )
	vr->yplacement = getushort(ttf);
    if ( vf&4 )
	vr->xadvance = getushort(ttf);
    if ( vf&8 )
	vr->yadvance = getushort(ttf);
    if ( vf&0x10 )
	vr->offXplaceDev = getushort(ttf);
    if ( vf&0x20 )
	vr->offYplaceDev = getushort(ttf);
    if ( vf&0x40 )
	vr->offXadvanceDev = getushort(ttf);
    if ( vf&0x80 )
	vr->offYadvanceDev = getushort(ttf);
}

#ifdef FONTFORGE_CONFIG_DEVICETABLES
static void ReadDeviceTable(FILE *ttf,DeviceTable *adjust,uint32 devtab,
	struct ttfinfo *info) {
    long here;
    int pack;
    int w,b,i,c;

    if ( devtab==0 )
return;
    here = ftell(ttf);
    fseek(ttf,devtab,SEEK_SET);
    adjust->first_pixel_size = getushort(ttf);
    adjust->last_pixel_size  = getushort(ttf);
    pack = getushort(ttf);
    if ( adjust->first_pixel_size>adjust->last_pixel_size || pack==0 || pack>3 ) {
	LogError(_("Bad device table\n" ));
	info->bad_ot = true;
	adjust->first_pixel_size = adjust->last_pixel_size = 0;
    } else {
	c = adjust->last_pixel_size-adjust->first_pixel_size+1;
	adjust->corrections = galloc(c);
	if ( pack==1 ) {
	    for ( i=0; i<c; i+=8 ) {
		w = getushort(ttf);
		for ( b=0; b<8 && i+b<c; ++b )
		    adjust->corrections[i+b] = ((int16) ((w<<(b*2))&0xc000))>>14;
	    }
	} else if ( pack==2 ) {
	    for ( i=0; i<c; i+=4 ) {
		w = getushort(ttf);
		for ( b=0; b<4 && i+b<c; ++b )
		    adjust->corrections[i+b] = ((int16) ((w<<(b*4))&0xf000))>>12;
	    }
	} else {
	    for ( i=0; i<c; ++i )
		adjust->corrections[i] = (int8) getc(ttf);
	}
    }
    fseek(ttf,here,SEEK_SET);
}

static ValDevTab *readValDevTab(FILE *ttf,struct valuerecord *vr,uint32 base,
	struct ttfinfo *info) {
    ValDevTab *ret;

    if ( vr->offXplaceDev==0 && vr->offYplaceDev==0 &&
	    vr->offXadvanceDev==0 && vr->offYadvanceDev==0 )
return( NULL );
    ret = chunkalloc(sizeof(ValDevTab));
    if ( vr->offXplaceDev!=0 )
	ReadDeviceTable(ttf,&ret->xadjust,base + vr->offXplaceDev,info);
    if ( vr->offYplaceDev!=0 )
	ReadDeviceTable(ttf,&ret->yadjust,base + vr->offYplaceDev,info);
    if ( vr->offXadvanceDev!=0 )
	ReadDeviceTable(ttf,&ret->xadv,base + vr->offXadvanceDev,info);
    if ( vr->offYadvanceDev!=0 )
	ReadDeviceTable(ttf,&ret->yadv,base + vr->offYadvanceDev,info);
return( ret );
}
#endif

static void addPairPos(struct ttfinfo *info, int glyph1, int glyph2,
	struct lookup *l, struct lookup_subtable *subtable, struct valuerecord *vr1,struct valuerecord *vr2,
	uint32 base,FILE *ttf) {
    (void)ttf; /* for -Wall */
    (void)l; /* for -Wall */
    (void)base; /* for -Wall */
    if ( glyph1<info->glyph_cnt && glyph2<info->glyph_cnt ) {
	PST *pos = chunkalloc(sizeof(PST));
	pos->type = pst_pair;
	pos->subtable = subtable;
	pos->next = info->chars[glyph1]->possub;
	info->chars[glyph1]->possub = pos;
	pos->u.pair.vr = chunkalloc(sizeof(struct vr [2]));
	pos->u.pair.paired = copy(info->chars[glyph2]->name);
	pos->u.pair.vr[0].xoff = vr1->xplacement;
	pos->u.pair.vr[0].yoff = vr1->yplacement;
	pos->u.pair.vr[0].h_adv_off = vr1->xadvance;
	pos->u.pair.vr[0].v_adv_off = vr1->yadvance;
	pos->u.pair.vr[1].xoff = vr2->xplacement;
	pos->u.pair.vr[1].yoff = vr2->yplacement;
	pos->u.pair.vr[1].h_adv_off = vr2->xadvance;
	pos->u.pair.vr[1].v_adv_off = vr2->yadvance;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	pos->u.pair.vr[0].adjust = readValDevTab(ttf,vr1,base,info);
	pos->u.pair.vr[1].adjust = readValDevTab(ttf,vr2,base,info);
#endif
    } else {
	LogError( _("Bad pair position: glyphs %d & %d should have been < %d\n"),
		glyph1, glyph2, info->glyph_cnt );
	info->bad_ot = true;
    }
}

static int addKernPair(struct ttfinfo *info, int glyph1, int glyph2,
	int16 offset, uint32 devtab, struct lookup *l, struct lookup_subtable *subtable,int isv,
	FILE *ttf) {
    KernPair *kp;
    (void)ttf; /* for -Wall */
    (void)l; /* for -Wall */
    (void)devtab; /* for -Wall */
    if ( glyph1<info->glyph_cnt && glyph2<info->glyph_cnt &&
	    info->chars[glyph1]!=NULL && info->chars[glyph2]!=NULL ) {
	for ( kp=isv ? info->chars[glyph1]->vkerns : info->chars[glyph1]->kerns;
		kp!=NULL; kp=kp->next ) {
	    if ( kp->sc == info->chars[glyph2] )
	break;
	}
	if ( kp==NULL ) {
	    kp = chunkalloc(sizeof(KernPair));
	    kp->sc = info->chars[glyph2];
	    kp->off = offset;
	    kp->subtable = subtable;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	    if ( devtab!=0 ) {
		kp->adjust = chunkalloc(sizeof(DeviceTable));
		ReadDeviceTable(ttf,kp->adjust,devtab,info);
	    }
#endif
	    if ( isv ) {
		kp->next = info->chars[glyph1]->vkerns;
		info->chars[glyph1]->vkerns = kp;
	    } else {
		kp->next = info->chars[glyph1]->kerns;
		info->chars[glyph1]->kerns = kp;
	    }
	} else if ( kp->subtable!=subtable )
return( true );
    } else if ( glyph1>=info->glyph_cnt || glyph2>=info->glyph_cnt ) {
	/* Might be NULL in a ttc file where we omit glyphs */
	LogError( _("Bad kern pair: glyphs %d & %d should have been < %d\n"),
		glyph1, glyph2, info->glyph_cnt );
	info->bad_ot = true;
    }
return( false );
}

static void gposKernSubTable(FILE *ttf, int stoffset, struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable) {
    int coverage, cnt, i, j, pair_cnt, vf1, vf2, glyph2;
    int cd1, cd2, c1_cnt, c2_cnt;
    uint16 format;
    uint16 *ps_offsets;
    uint16 *glyphs, *class1, *class2;
    struct valuerecord vr1, vr2;
    long foffset;
    KernClass *kc;
    int isv, r2l;

    format=getushort(ttf);
    if ( format!=1 && format!=2 )	/* Unknown subtable format */
return;
    coverage = getushort(ttf);
    vf1 = getushort(ttf);
    vf2 = getushort(ttf);
    r2l = 0;

    /* Accept forms both with and without device tables */
    if ( (vf1==0x0008 || vf1==0x0088) && vf2==0x0000 )
	isv = 1;		/* Top to bottom */
    else if ( vf1==0x0000 && (vf2==0x0004 || vf2==0x0044) && (l->flags&pst_r2l)) {
	isv = 0;		/* Right to left */
	r2l = 1;
    } else if ( (vf1==0x0004 || vf1==0x0044) && vf2==0x0000 && !(l->flags&pst_r2l) )
	isv = 0;		/* Left to right */
    else
	isv = 2;		/* Can't optimize, store all 8 settings */
    if ( format==1 ) {
	subtable->per_glyph_pst_or_kern = true;
	cnt = getushort(ttf);
	ps_offsets = galloc(cnt*sizeof(uint16));
	for ( i=0; i<cnt; ++i )
	    ps_offsets[i]=getushort(ttf);
	glyphs = getCoverageTable(ttf,stoffset+coverage,info);
	if ( glyphs==NULL )
return;
	for ( i=0; i<cnt; ++i ) if ( glyphs[i]<info->glyph_cnt ) {
	    fseek(ttf,stoffset+ps_offsets[i],SEEK_SET);
	    pair_cnt = getushort(ttf);
	    for ( j=0; j<pair_cnt; ++j ) {
		glyph2 = getushort(ttf);
		readvaluerecord(&vr1,vf1,ttf);
		readvaluerecord(&vr2,vf2,ttf);
		if ( isv==2 )
		    addPairPos(info, glyphs[i], glyph2,l,subtable,&vr1,&vr2, stoffset,ttf);
		else if ( isv ) {
		    if ( addKernPair(info, glyphs[i], glyph2, vr1.yadvance,
			    vr1.offYadvanceDev==0?0:stoffset+vr1.offYadvanceDev,
			    l,subtable,isv,ttf))
			addPairPos(info, glyphs[i], glyph2,l,subtable,&vr1,&vr2, stoffset,ttf);
			/* If we've already got kern data for this pair of */
			/*  glyphs, then we can't make it be a true KernPair */
			/*  but we can save the info as a pst_pair */
		} else if ( r2l ) {	/* R2L */
		    if ( addKernPair(info, glyphs[i], glyph2, vr2.xadvance,
			    vr2.offXadvanceDev==0?0:stoffset+vr2.offXadvanceDev,
			    l,subtable,isv,ttf))
			addPairPos(info, glyphs[i], glyph2,l,subtable,&vr1,&vr2,stoffset,ttf);
		} else {
		    if ( addKernPair(info, glyphs[i], glyph2, vr1.xadvance,
			    vr1.offXadvanceDev==0?0:stoffset+vr1.offXadvanceDev,
			    l,subtable,isv,ttf))
			addPairPos(info, glyphs[i], glyph2,l,subtable,&vr1,&vr2,stoffset,ttf);
		}
	    }
	}
	free(ps_offsets); free(glyphs);
    } else if ( format==2 ) {	/* Class-based kerning */
	cd1 = getushort(ttf);
	cd2 = getushort(ttf);
	foffset = ftell(ttf);
	class1 = getClassDefTable(ttf, stoffset+cd1, info);
	class2 = getClassDefTable(ttf, stoffset+cd2, info);
	glyphs = getCoverageTable(ttf,stoffset+coverage,info);
	fseek(ttf, foffset, SEEK_SET);	/* come back */
	c1_cnt = getushort(ttf);
	c2_cnt = getushort(ttf);
	if ( isv!=2 ) {
	    if ( isv ) {
		if ( info->vkhead==NULL )
		    info->vkhead = kc = chunkalloc(sizeof(KernClass));
		else
		    kc = info->vklast->next = chunkalloc(sizeof(KernClass));
		info->vklast = kc;
	    } else {
		if ( info->khead==NULL )
		    info->khead = kc = chunkalloc(sizeof(KernClass));
		else
		    kc = info->klast->next = chunkalloc(sizeof(KernClass));
		info->klast = kc;
	    }
	    subtable->vertical_kerning = isv;
	    subtable->kc = kc;
	    kc->first_cnt = c1_cnt; kc->second_cnt = c2_cnt;
	    kc->subtable = subtable;
	    kc->offsets = galloc(c1_cnt*c2_cnt*sizeof(int16));
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	    kc->adjusts = gcalloc(c1_cnt*c2_cnt,sizeof(DeviceTable));
#endif
	    kc->firsts = ClassToNames(info,c1_cnt,class1,info->glyph_cnt);
	    kc->seconds = ClassToNames(info,c2_cnt,class2,info->glyph_cnt);
	    /* Now if the coverage table contains entries which are not in */
	    /*  the list of first classes, then those glyphs are the real */
	    /*  values for kc->firsts[0] */
	    kc->firsts[0] = CoverageMinusClasses(glyphs,class1,info);
	    for ( i=0; i<c1_cnt; ++i) {
		for ( j=0; j<c2_cnt; ++j) {
		    readvaluerecord(&vr1,vf1,ttf);
		    readvaluerecord(&vr2,vf2,ttf);
		    if ( isv )
			kc->offsets[i*c2_cnt+j] = vr1.yadvance;
		    else if ( r2l )
			kc->offsets[i*c2_cnt+j] = vr2.xadvance;
		    else
			kc->offsets[i*c2_cnt+j] = vr1.xadvance;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
		    if ( isv ) {
			if ( vr1.offYadvanceDev!=0 )
			    ReadDeviceTable(ttf,&kc->adjusts[i*c2_cnt+j],stoffset+vr1.offYadvanceDev,info);
		    } else if ( r2l ) {
			if ( vr2.offXadvanceDev!=0 )
			    ReadDeviceTable(ttf,&kc->adjusts[i*c2_cnt+j],stoffset+vr2.offXadvanceDev,info);
		    } else {
			if ( vr1.offXadvanceDev!=0 )
			    ReadDeviceTable(ttf,&kc->adjusts[i*c2_cnt+j],stoffset+vr1.offXadvanceDev,info);
		    }
#endif
		}
	    }
	} else {	/* This happens when we have a feature which is neither 'kern' nor 'vkrn' we don't know what to do with it so we make it into kern pairs */
	    int k,m;
	    subtable->per_glyph_pst_or_kern = true;
	    for ( i=0; i<c1_cnt; ++i) {
		for ( j=0; j<c2_cnt; ++j) {
		    readvaluerecord(&vr1,vf1,ttf);
		    readvaluerecord(&vr2,vf2,ttf);
		    if ( vr1.xadvance!=0 || vr1.xplacement!=0 || vr1.yadvance!=0 || vr1.yplacement!=0 ||
			    vr2.xadvance!=0 || vr2.xplacement!=0 || vr2.yadvance!=0 || vr2.yplacement!=0 )
			for ( k=0; k<info->glyph_cnt; ++k )
			    if ( class1[k]==i )
				for ( m=0; m<info->glyph_cnt; ++m )
				    if ( class2[m]==j )
					addPairPos(info, k,m,l,subtable,&vr1,&vr2,stoffset,ttf);
		}
	    }
	}
	free(class1); free(class2);
	free(glyphs);
    }
}

static AnchorPoint *readAnchorPoint(FILE *ttf,uint32 base,AnchorClass *class,
	enum anchor_type type,AnchorPoint *last, struct ttfinfo *info) {
    AnchorPoint *ap;
    int format;
    (void)info; /* for -Wall */
    fseek(ttf,base,SEEK_SET);

    ap = chunkalloc(sizeof(AnchorPoint));
    ap->anchor = class;
    /* All anchor types have the same initial 3 entries, format */
    /*  x,y pos. format 2 contains a truetype positioning point, and */
    /*  format==3 may also have device tables */
    format = getushort(ttf);
    ap->me.x = (int16) getushort(ttf);
    ap->me.y = (int16) getushort(ttf);
    ap->type = type;
    if ( format==2 ) {
	ap->ttf_pt_index = getushort(ttf);
	ap->has_ttf_pt = true;
    }
#ifdef FONTFORGE_CONFIG_DEVICETABLES
    else if ( format==3 ) {
	int devoff;
	devoff = getushort(ttf);
	if ( devoff!=0 )
	    ReadDeviceTable(ttf,&ap->xadjust,base+devoff,info);
	devoff = getushort(ttf);
	if ( devoff!=0 )
	    ReadDeviceTable(ttf,&ap->yadjust,base+devoff,info);
    }
#endif
    ap->next = last;
return( ap );
}

static void gposCursiveSubTable(FILE *ttf, int stoffset, struct ttfinfo *info,struct lookup *l, struct lookup_subtable *subtable) {
    int coverage, cnt, format, i;
    struct ee_offsets { int entry, exit; } *offsets;
    uint16 *glyphs;
    AnchorClass *class;
    SplineChar *sc;
    char buf[50];
    (void)l; /* for -Wall */
    format=getushort(ttf);
    if ( format!=1 )	/* Unknown subtable format */
return;
    coverage = getushort(ttf);
    cnt = getushort(ttf);
    if ( cnt==0 )
return;
    offsets = galloc(cnt*sizeof(struct ee_offsets));
    for ( i=0; i<cnt; ++i ) {
	offsets[i].entry = getushort(ttf);
	offsets[i].exit  = getushort(ttf);
    }
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);

    class = chunkalloc(sizeof(AnchorClass));
    snprintf(buf,sizeof(buf),_("Cursive-%d"),
	    info->anchor_class_cnt++ );
    class->name = copy(buf);
    subtable->anchor_classes = true;
    class->subtable = subtable;
    class->type = act_curs;
    if ( info->ahead==NULL )
	info->ahead = class;
    else
	info->alast->next = class;
    info->alast = class;

    for ( i=0; i<cnt; ++i ) {
	sc = info->chars[glyphs[i]];
	if ( offsets[i].entry!=0 ) {
	    sc->anchor = readAnchorPoint(ttf,stoffset+offsets[i].entry,class,
		    at_centry,sc->anchor,info);
	}
	if ( offsets[i].exit!=0 ) {
	    sc->anchor = readAnchorPoint(ttf,stoffset+offsets[i].exit,class,
		    at_cexit,sc->anchor,info);
	}
    }
    free(offsets);
    free(glyphs);
}

static AnchorClass **MarkGlyphsProcessMarks(FILE *ttf,int markoffset,
	struct ttfinfo *info,struct lookup *l, struct lookup_subtable *subtable,uint16 *markglyphs,
	int classcnt) {
    AnchorClass **classes = gcalloc(classcnt,sizeof(AnchorClass *)), *ac;
    char buf[50];
    int i, cnt;
    struct mr { uint16 class, offset; } *at_offsets;
    SplineChar *sc;

    for ( i=0; i<classcnt; ++i ) {
	snprintf(buf,sizeof(buf),_("Anchor-%d"),
		info->anchor_class_cnt+i );
	classes[i] = ac = chunkalloc(sizeof(AnchorClass));
	ac->name = copy(buf);
	subtable->anchor_classes = true;
	ac->subtable = subtable;
	/*ac->merge_with = info->anchor_merge_cnt+1;*/
	ac->type = l->otlookup->lookup_type==gpos_mark2mark ? act_mkmk : act_mark;
	    /* I don't distinguish between mark to base and mark to lig */
	if ( info->ahead==NULL )
	    info->ahead = ac;
	else
	    info->alast->next = ac;
	info->alast = ac;
    }

    fseek(ttf,markoffset,SEEK_SET);
    cnt = getushort(ttf);
    if ( feof(ttf) ) {
	LogError( _("Bad mark table.\n") );
	info->bad_ot = true;
return( NULL );
    }
    at_offsets = galloc(cnt*sizeof(struct mr));
    for ( i=0; i<cnt; ++i ) {
	at_offsets[i].class = getushort(ttf);
	at_offsets[i].offset = getushort(ttf);
	if ( at_offsets[i].class>=classcnt ) {
	    at_offsets[i].class = 0;
	    if ( markglyphs[i]>=info->glyph_cnt )
		LogError( _("Class out of bounds in GPOS mark sub-table\n") );
	    else
		LogError( _("Class out of bounds in GPOS mark sub-table for mark %.30s\n"), info->chars[markglyphs[i]]->name);
	    info->bad_ot = true;
	}
    }
    for ( i=0; i<cnt; ++i ) {
	if ( markglyphs[i]>=info->glyph_cnt )
    continue;
	sc = info->chars[markglyphs[i]];
	if ( sc==NULL || at_offsets[i].offset==0 )
    continue;
	sc->anchor = readAnchorPoint(ttf,markoffset+at_offsets[i].offset,
		classes[at_offsets[i].class],at_mark,sc->anchor,info);
    }
    free(at_offsets);
return( classes );
}

static void MarkGlyphsProcessBases(FILE *ttf,int baseoffset,
	struct ttfinfo *info,struct lookup *l, struct lookup_subtable *subtable,uint16 *baseglyphs,int classcnt,
	AnchorClass **classes,enum anchor_type at) {
    int basecnt,i, j, ibase;
    uint16 *offsets;
    SplineChar *sc;
    (void)subtable; /* for -Wall */
    (void)l; /* for -Wall */
    fseek(ttf,baseoffset,SEEK_SET);
    basecnt = getushort(ttf);
    if ( feof(ttf) ) {
	LogError( _("Bad base table.\n") );
	info->bad_ot = true;
return;
    }
    offsets = galloc(basecnt*classcnt*sizeof(uint16));
    for ( i=0; i<basecnt*classcnt; ++i )
	offsets[i] = getushort(ttf);
    for ( i=ibase=0; i<basecnt; ++i, ibase+= classcnt ) {
	if ( baseglyphs[i]>=info->glyph_cnt )
    continue;
	sc = info->chars[baseglyphs[i]];
	if ( sc==NULL )
    continue;
	for ( j=0; j<classcnt; ++j ) if ( offsets[ibase+j]!=0 ) {
	    sc->anchor = readAnchorPoint(ttf,baseoffset+offsets[ibase+j],
		    classes[j], at,sc->anchor,info);
	}
    }
    free(offsets);
}

static void MarkGlyphsProcessLigs(FILE *ttf,int baseoffset,
	struct ttfinfo *info,struct lookup *l, struct lookup_subtable *subtable,uint16 *baseglyphs,int classcnt,
	AnchorClass **classes) {
    int basecnt,compcnt, i, j, k, kbase;
    uint16 *loffsets, *aoffsets;
    SplineChar *sc;
    (void)subtable; /* for -Wall */
    (void)l; /* for -Wall */
    fseek(ttf,baseoffset,SEEK_SET);
    basecnt = getushort(ttf);
    if ( feof(ttf) ) {
	LogError( _("Bad ligature base table.\n") );
	info->bad_ot = true;
return;
    }
    loffsets = galloc(basecnt*sizeof(uint16));
    for ( i=0; i<basecnt; ++i )
	loffsets[i] = getushort(ttf);
    for ( i=0; i<basecnt; ++i ) {
	sc = info->chars[baseglyphs[i]];
	if ( baseglyphs[i]>=info->glyph_cnt || sc==NULL )
    continue;
	fseek(ttf,baseoffset+loffsets[i],SEEK_SET);
	compcnt = getushort(ttf);
	if ( feof(ttf)) {
	    LogError(_("Bad ligature anchor count.\n"));
	    info->bad_ot = true;
    continue;
	}
	aoffsets = galloc(compcnt*classcnt*sizeof(uint16));
	for ( k=0; k<compcnt*classcnt; ++k )
	    aoffsets[k] = getushort(ttf);
	for ( k=kbase=0; k<compcnt; ++k, kbase+=classcnt ) {
	    for ( j=0; j<classcnt; ++j ) if ( aoffsets[kbase+j]!=0 ) {
		sc->anchor = readAnchorPoint(ttf,baseoffset+loffsets[i]+aoffsets[kbase+j],
			classes[j], at_baselig,sc->anchor,info);
		sc->anchor->lig_index = k;
	    }
	}
	free(aoffsets);
    }
    free(loffsets);
}

static void gposMarkSubTable(FILE *ttf, uint32 stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable) {
    int markcoverage, basecoverage, classcnt, markoffset, baseoffset;
    uint16 *markglyphs, *baseglyphs;
    AnchorClass **classes;

	/* The header for the three different mark tables is the same */
    /* Type = */ getushort(ttf);
    markcoverage = getushort(ttf);
    basecoverage = getushort(ttf);
    classcnt = getushort(ttf);
    markoffset = getushort(ttf);
    baseoffset = getushort(ttf);
    markglyphs = getCoverageTable(ttf,stoffset+markcoverage,info);
    baseglyphs = getCoverageTable(ttf,stoffset+basecoverage,info);
    if ( baseglyphs==NULL || markglyphs==NULL ) {
	free(baseglyphs); free(markglyphs);
return;
    }
	/* as is the (first) mark table */
    classes = MarkGlyphsProcessMarks(ttf,stoffset+markoffset,
	    info,l,subtable,markglyphs,classcnt);
    if ( classes==NULL )
return;
    switch ( l->otlookup->lookup_type ) {
      case gpos_mark2base:
      case gpos_mark2mark:
	  MarkGlyphsProcessBases(ttf,stoffset+baseoffset,
	    info,l,subtable,baseglyphs,classcnt,classes,
	    l->otlookup->lookup_type==gpos_mark2base?at_basechar:at_basemark);
      break;
      case gpos_mark2ligature:
	  MarkGlyphsProcessLigs(ttf,stoffset+baseoffset,
	    info,l,subtable,baseglyphs,classcnt,classes);
      break;
      default:
      break;
    }
    info->anchor_class_cnt += classcnt;
    ++ info->anchor_merge_cnt;
    free(markglyphs); free(baseglyphs);
    free(classes);
}

static void gposSimplePos(FILE *ttf, int stoffset, struct ttfinfo *info,
	struct lookup *l, struct lookup_subtable *subtable) {
    int coverage, cnt, i, vf;
    uint16 format;
    uint16 *glyphs;
    struct valuerecord *vr=NULL, _vr, *which;
    (void)l; /* for -Wall */
    format=getushort(ttf);
    if ( format!=1 && format!=2 )	/* Unknown subtable format */
return;
    coverage = getushort(ttf);
    vf = getushort(ttf);
#ifdef FONTFORGE_CONFIG_DEVICETABLES
    if ( vf==0 )
return;
#else
    if ( (vf&0xf)==0 )	/* Not interested in things whose data just live in device tables */
return;
#endif
    if ( format==1 ) {
	memset(&_vr,0,sizeof(_vr));
	readvaluerecord(&_vr,vf,ttf);
    } else {
	cnt = getushort(ttf);
	vr = gcalloc(cnt,sizeof(struct valuerecord));
	for ( i=0; i<cnt; ++i )
	    readvaluerecord(&vr[i],vf,ttf);
    }
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    if ( glyphs==NULL ) {
	free(vr);
return;
    }
    for ( i=0; glyphs[i]!=0xffff; ++i ) if ( glyphs[i]<info->glyph_cnt ) {
	PST *pos = chunkalloc(sizeof(PST));
	pos->type = pst_position;
	pos->subtable = subtable;
	pos->next = info->chars[glyphs[i]]->possub;
	info->chars[glyphs[i]]->possub = pos;
	which = format==1 ? &_vr : &vr[i];
	pos->u.pos.xoff = which->xplacement;
	pos->u.pos.yoff = which->yplacement;
	pos->u.pos.h_adv_off = which->xadvance;
	pos->u.pos.v_adv_off = which->yadvance;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	pos->u.pos.adjust = readValDevTab(ttf,which,stoffset,info);
#endif
    }
    subtable->per_glyph_pst_or_kern = true;
    free(vr);
    free(glyphs);
}

static void ProcessSubLookups(FILE *ttf,struct ttfinfo *info,int gpos,
	struct lookup *alllooks,struct seqlookup *sl) {
    int i;
    (void)ttf; /* for -Wall */
    i = (intpt) sl->lookup;
    if ( i<0 || i>=info->lookup_cnt ) {
	LogError( _("Attempt to reference lookup %d (within a contextual lookup), but there are\n only %d lookups in %s\n"),
		i, info->lookup_cnt, gpos ? "'GPOS'" : "'GSUB'" );
	info->bad_ot = true;
	sl->lookup = NULL;
return;
    }
    sl->lookup = alllooks[i].otlookup;
}

static void g___ContextSubTable1(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, j, k, rcnt, cnt;
    uint16 coverage;
    uint16 *glyphs;
    struct subrule {
	uint32 offset;
	int gcnt;
	int scnt;
	uint16 *glyphs;
	struct seqlookup *sl;
    };
    struct rule {
	uint32 offsets;
	int scnt;
	struct subrule *subrules;
    } *rules;
    FPST *fpst;
    struct fpst_rule *rule;
    int warned = false, warned2 = false;
    (void)l; /* for -Wall */
    coverage = getushort(ttf);
    rcnt = getushort(ttf);		/* glyph count in coverage table */
    rules = galloc(rcnt*sizeof(struct rule));
    for ( i=0; i<rcnt; ++i )
	rules[i].offsets = getushort(ttf)+stoffset;
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    cnt = 0;
    for ( i=0; i<rcnt; ++i ) {
	fseek(ttf,rules[i].offsets,SEEK_SET);
	rules[i].scnt = getushort(ttf);
	cnt += rules[i].scnt;
	rules[i].subrules = galloc(rules[i].scnt*sizeof(struct subrule));
	for ( j=0; j<rules[i].scnt; ++j )
	    rules[i].subrules[j].offset = getushort(ttf)+rules[i].offsets;
	for ( j=0; j<rules[i].scnt; ++j ) {
	    fseek(ttf,rules[i].subrules[j].offset,SEEK_SET);
	    rules[i].subrules[j].gcnt = getushort(ttf);
	    rules[i].subrules[j].scnt = getushort(ttf);
	    rules[i].subrules[j].glyphs = galloc((rules[i].subrules[j].gcnt+1)*sizeof(uint16));
	    rules[i].subrules[j].glyphs[0] = glyphs[i];
	    for ( k=1; k<rules[i].subrules[j].gcnt; ++k ) {
		rules[i].subrules[j].glyphs[k] = getushort(ttf);
		if ( rules[i].subrules[j].glyphs[k]>=info->glyph_cnt ) {
		    if ( !warned )
			LogError( _("Bad contextual or chaining sub table. Glyph %d out of range [0,%d)\n"),
				 rules[i].subrules[j].glyphs[k], info->glyph_cnt );
		    info->bad_ot = true;
		    warned = true;
		    rules[i].subrules[j].glyphs[k] = 0;
		 }
	    }
	    rules[i].subrules[j].glyphs[k] = 0xffff;
	    rules[i].subrules[j].sl = galloc(rules[i].subrules[j].scnt*sizeof(struct seqlookup));
	    for ( k=0; k<rules[i].subrules[j].scnt; ++k ) {
		rules[i].subrules[j].sl[k].seq = getushort(ttf);
		if ( rules[i].subrules[j].sl[k].seq >= rules[i].subrules[j].gcnt+1 )
		    if ( !warned2 ) {
			LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d max=%d\n"),
				rules[i].subrules[j].sl[k].seq, rules[i].subrules[j].gcnt );
			info->bad_ot = true;
			warned2 = true;
		    }
		rules[i].subrules[j].sl[k].lookup = (void *) (intpt) getushort(ttf);
	    }
	}
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_contextpos : pst_contextsub;
	fpst->format = pst_glyphs;
	fpst->subtable = subtable;
	fpst->next = info->possub;
	info->possub = fpst;
	subtable->fpst = fpst;

	fpst->rules = rule = gcalloc(cnt,sizeof(struct fpst_rule));
	fpst->rule_cnt = cnt;

	cnt = 0;
	for ( i=0; i<rcnt; ++i ) for ( j=0; j<rules[i].scnt; ++j ) {
	    rule[cnt].u.glyph.names = GlyphsToNames(info,rules[i].subrules[j].glyphs,false);
	    rule[cnt].lookup_cnt = rules[i].subrules[j].scnt;
	    rule[cnt].lookups = rules[i].subrules[j].sl;
	    rules[i].subrules[j].sl = NULL;
	    for ( k=0; k<rule[cnt].lookup_cnt; ++k )
		ProcessSubLookups(ttf,info,gpos,alllooks,&rule[cnt].lookups[k]);
	    ++cnt;
	}
    }

    for ( i=0; i<rcnt; ++i ) {
	for ( j=0; j<rules[i].scnt; ++j ) {
	    free(rules[i].subrules[j].glyphs);
	    free(rules[i].subrules[j].sl);
	}
	free(rules[i].subrules);
    }
    free(rules);
    free(glyphs);
}

static void g___ChainingSubTable1(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, j, k, rcnt, cnt, which;
    uint16 coverage;
    uint16 *glyphs;
    struct subrule {
	uint32 offset;
	int gcnt, bcnt, fcnt;
	int scnt;
	uint16 *glyphs, *bglyphs, *fglyphs;
	struct seqlookup *sl;
    };
    struct rule {
	uint32 offsets;
	int scnt;
	struct subrule *subrules;
    } *rules;
    FPST *fpst;
    struct fpst_rule *rule;
    int warned = false, warned2 = false;
    (void)l; /* for -Wall */
    coverage = getushort(ttf);
    rcnt = getushort(ttf);		/* glyph count in coverage table */
    rules = galloc(rcnt*sizeof(struct rule));
    for ( i=0; i<rcnt; ++i )
	rules[i].offsets = getushort(ttf)+stoffset;
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    if ( glyphs==NULL ) {
	free(rules);
return;
    }
    cnt = 0;
    for ( i=0; i<rcnt; ++i ) {
	fseek(ttf,rules[i].offsets,SEEK_SET);
	rules[i].scnt = getushort(ttf);
	cnt += rules[i].scnt;
	rules[i].subrules = galloc(rules[i].scnt*sizeof(struct subrule));
	for ( j=0; j<rules[i].scnt; ++j )
	    rules[i].subrules[j].offset = getushort(ttf)+rules[i].offsets;
	for ( j=0; j<rules[i].scnt; ++j ) {
	    fseek(ttf,rules[i].subrules[j].offset,SEEK_SET);
	    rules[i].subrules[j].bcnt = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Unexpected end of file in contextual chaining subtable.\n") );
		info->bad_ot = true;
return;
	    }
	    rules[i].subrules[j].bglyphs = galloc((rules[i].subrules[j].bcnt+1)*sizeof(uint16));
	    for ( k=0; k<rules[i].subrules[j].bcnt; ++k )
		rules[i].subrules[j].bglyphs[k] = getushort(ttf);
	    rules[i].subrules[j].bglyphs[k] = 0xffff;

	    rules[i].subrules[j].gcnt = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Unexpected end of file in contextual chaining subtable.\n") );
		info->bad_ot = true;
return;
	    }
	    rules[i].subrules[j].glyphs = galloc((rules[i].subrules[j].gcnt+1)*sizeof(uint16));
	    rules[i].subrules[j].glyphs[0] = glyphs[i];
	    for ( k=1; k<rules[i].subrules[j].gcnt; ++k )
		rules[i].subrules[j].glyphs[k] = getushort(ttf);
	    rules[i].subrules[j].glyphs[k] = 0xffff;

	    rules[i].subrules[j].fcnt = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Unexpected end of file in contextual chaining subtable.\n") );
		info->bad_ot = true;
return;
	    }
	    rules[i].subrules[j].fglyphs = galloc((rules[i].subrules[j].fcnt+1)*sizeof(uint16));
	    for ( k=0; k<rules[i].subrules[j].fcnt; ++k )
		rules[i].subrules[j].fglyphs[k] = getushort(ttf);
	    rules[i].subrules[j].fglyphs[k] = 0xffff;

	    for ( which = 0; which<3; ++which ) {
		for ( k=0; k<(&rules[i].subrules[j].gcnt)[which]; ++k ) {
		    if ( (&rules[i].subrules[j].glyphs)[which][k]>=info->glyph_cnt ) {
			if ( !warned )
			    LogError( _("Bad contextual or chaining sub table. Glyph %d out of range [0,%d)\n"),
				    (&rules[i].subrules[j].glyphs)[which][k], info->glyph_cnt );
			info->bad_ot = true;
			warned = true;
			(&rules[i].subrules[j].glyphs)[which][k] = 0;
		    }
		}
	    }

	    rules[i].subrules[j].scnt = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Unexpected end of file in contextual chaining subtable.\n") );
		info->bad_ot = true;
return;
	    }
	    rules[i].subrules[j].sl = galloc(rules[i].subrules[j].scnt*sizeof(struct seqlookup));
	    for ( k=0; k<rules[i].subrules[j].scnt; ++k ) {
		rules[i].subrules[j].sl[k].seq = getushort(ttf);
		if ( rules[i].subrules[j].sl[k].seq >= rules[i].subrules[j].gcnt+1 )
		    if ( !warned2 ) {
			LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d max=%d\n"),
				rules[i].subrules[j].sl[k].seq, rules[i].subrules[j].gcnt );
			info->bad_ot = true;
			warned2 = true;
		    }
		rules[i].subrules[j].sl[k].lookup = (void *) (intpt) getushort(ttf);
	    }
	}
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_chainpos : pst_chainsub;
	fpst->format = pst_glyphs;
	fpst->subtable = subtable;
	fpst->next = info->possub;
	info->possub = fpst;
	subtable->fpst = fpst;

	fpst->rules = rule = gcalloc(cnt,sizeof(struct fpst_rule));
	fpst->rule_cnt = cnt;

	cnt = 0;
	for ( i=0; i<rcnt; ++i ) for ( j=0; j<rules[i].scnt; ++j ) {
	    rule[cnt].u.glyph.back = GlyphsToNames(info,rules[i].subrules[j].bglyphs,false);
	    rule[cnt].u.glyph.names = GlyphsToNames(info,rules[i].subrules[j].glyphs,false);
	    rule[cnt].u.glyph.fore = GlyphsToNames(info,rules[i].subrules[j].fglyphs,false);
	    rule[cnt].lookup_cnt = rules[i].subrules[j].scnt;
	    rule[cnt].lookups = rules[i].subrules[j].sl;
	    rules[i].subrules[j].sl = NULL;
	    for ( k=0; k<rule[cnt].lookup_cnt; ++k )
		ProcessSubLookups(ttf,info,gpos,alllooks,&rule[cnt].lookups[k]);
	    ++cnt;
	}
    }

    for ( i=0; i<rcnt; ++i ) {
	for ( j=0; j<rules[i].scnt; ++j ) {
	    free(rules[i].subrules[j].bglyphs);
	    free(rules[i].subrules[j].glyphs);
	    free(rules[i].subrules[j].fglyphs);
	    free(rules[i].subrules[j].sl);
	}
	free(rules[i].subrules);
    }
    free(rules);
    free(glyphs);
}

static void g___ContextSubTable2(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, j, k, rcnt, cnt;
    uint16 coverage;
    uint16 classoff;
    struct subrule {
	uint32 offset;
	int ccnt;
	int scnt;
	uint16 *classindeces;
	struct seqlookup *sl;
    };
    struct rule {
	uint32 offsets;
	int scnt;
	struct subrule *subrules;
    } *rules;
    FPST *fpst;
    struct fpst_rule *rule;
    uint16 *glyphs, *class;
    int warned2 = false;
    (void)l; /* for -Wall */
    coverage = getushort(ttf);
    classoff = getushort(ttf);
    rcnt = getushort(ttf);		/* class count in coverage table *//* == number of top level rules */
    rules = gcalloc(rcnt,sizeof(struct rule));
    for ( i=0; i<rcnt; ++i )
	rules[i].offsets = getushort(ttf)+stoffset;
    cnt = 0;
    for ( i=0; i<rcnt; ++i ) if ( rules[i].offsets!=(unsigned)stoffset ) { /* some classes might be unused */
	fseek(ttf,rules[i].offsets,SEEK_SET);
	rules[i].scnt = getushort(ttf);
	if ( rules[i].scnt<0 ) {
	    LogError( _("Bad count in context chaining sub-table.\n") );
	    info->bad_ot = true;
return;
	}
	cnt += rules[i].scnt;
	rules[i].subrules = galloc(rules[i].scnt*sizeof(struct subrule));
	for ( j=0; j<rules[i].scnt; ++j )
	    rules[i].subrules[j].offset = getushort(ttf)+rules[i].offsets;
	for ( j=0; j<rules[i].scnt; ++j ) {
	    fseek(ttf,rules[i].subrules[j].offset,SEEK_SET);
	    rules[i].subrules[j].ccnt = getushort(ttf);
	    rules[i].subrules[j].scnt = getushort(ttf);
	    if ( rules[i].subrules[j].ccnt<0 ) {
		LogError( _("Bad class count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].classindeces = galloc(rules[i].subrules[j].ccnt*sizeof(uint16));
	    rules[i].subrules[j].classindeces[0] = i;
	    for ( k=1; k<rules[i].subrules[j].ccnt; ++k )
		rules[i].subrules[j].classindeces[k] = getushort(ttf);
	    if ( rules[i].subrules[j].scnt<0 ) {
		LogError( _("Bad count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].sl = galloc(rules[i].subrules[j].scnt*sizeof(struct seqlookup));
	    for ( k=0; k<rules[i].subrules[j].scnt; ++k ) {
		rules[i].subrules[j].sl[k].seq = getushort(ttf);
		if ( rules[i].subrules[j].sl[k].seq >= rules[i].subrules[j].ccnt )
		    if ( !warned2 ) {
			LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d max=%d\n"),
				rules[i].subrules[j].sl[k].seq, rules[i].subrules[j].ccnt-1);
			info->bad_ot = true;
			warned2 = true;
		    }
		rules[i].subrules[j].sl[k].lookup = (void *) (intpt) getushort(ttf);
	    }
	}
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_contextpos : pst_contextsub;
	fpst->format = pst_class;
	fpst->subtable = subtable;
	subtable->fpst = fpst;
	fpst->next = info->possub;
	info->possub = fpst;

	fpst->rules = rule = gcalloc(cnt,sizeof(struct fpst_rule));
	fpst->rule_cnt = cnt;
	class = getClassDefTable(ttf, stoffset+classoff, info);
	fpst->nccnt = ClassFindCnt(class,info->glyph_cnt);
	fpst->nclass = ClassToNames(info,fpst->nccnt,class,info->glyph_cnt);

	/* Just in case they used the coverage table to redefine class 0 */
	glyphs = getCoverageTable(ttf,stoffset+coverage,info);
	fpst->nclass[0] = CoverageMinusClasses(glyphs,class,info);
	free(glyphs); free(class); class = NULL;

	cnt = 0;
	for ( i=0; i<rcnt; ++i ) for ( j=0; j<rules[i].scnt; ++j ) {
	    rule[cnt].u.class.nclasses = rules[i].subrules[j].classindeces;
	    rule[cnt].u.class.ncnt = rules[i].subrules[j].ccnt;
	    rules[i].subrules[j].classindeces = NULL;
	    rule[cnt].lookup_cnt = rules[i].subrules[j].scnt;
	    rule[cnt].lookups = rules[i].subrules[j].sl;
	    rules[i].subrules[j].sl = NULL;
	    for ( k=0; k<rule[cnt].lookup_cnt; ++k )
		ProcessSubLookups(ttf,info,gpos,alllooks,&rule[cnt].lookups[k]);
	    ++cnt;
	}
    }

    for ( i=0; i<rcnt; ++i ) {
	for ( j=0; j<rules[i].scnt; ++j ) {
	    free(rules[i].subrules[j].classindeces);
	    free(rules[i].subrules[j].sl);
	}
	free(rules[i].subrules);
    }
    free(rules);
}

static void g___ChainingSubTable2(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, j, k, rcnt, cnt;
    uint16 coverage, offset;
    uint16 bclassoff, classoff, fclassoff;
    struct subrule {
	uint32 offset;
	int ccnt, bccnt, fccnt;
	int scnt;
	uint16 *classindeces, *bci, *fci;
	struct seqlookup *sl;
    };
    struct rule {
	uint32 offsets;
	int scnt;
	struct subrule *subrules;
    } *rules;
    FPST *fpst;
    struct fpst_rule *rule;
    uint16 *glyphs, *class;
    int warned2 = false;
    (void)l; /* for -Wall */
    coverage = getushort(ttf);
    bclassoff = getushort(ttf);
    classoff = getushort(ttf);
    fclassoff = getushort(ttf);
    rcnt = getushort(ttf);		/* class count *//* == max number of top level rules */
    rules = gcalloc(rcnt,sizeof(struct rule));
    for ( i=0; i<rcnt; ++i ) {
	offset = getushort(ttf);
	rules[i].offsets = offset==0 ? 0 : offset+stoffset;
    }
    cnt = 0;
    for ( i=0; i<rcnt; ++i ) if ( rules[i].offsets!=0 ) { /* some classes might be unused */
	fseek(ttf,rules[i].offsets,SEEK_SET);
	rules[i].scnt = getushort(ttf);
	if ( rules[i].scnt<0 ) {
	    LogError( _("Bad count in context chaining sub-table.\n") );
	    info->bad_ot = true;
return;
	}
	cnt += rules[i].scnt;
	rules[i].subrules = galloc(rules[i].scnt*sizeof(struct subrule));
	for ( j=0; j<rules[i].scnt; ++j )
	    rules[i].subrules[j].offset = getushort(ttf)+rules[i].offsets;
	for ( j=0; j<rules[i].scnt; ++j ) {
	    fseek(ttf,rules[i].subrules[j].offset,SEEK_SET);
	    rules[i].subrules[j].bccnt = getushort(ttf);
	    if ( rules[i].subrules[j].bccnt<0 ) {
		LogError( _("Bad class count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].bci = galloc(rules[i].subrules[j].bccnt*sizeof(uint16));
	    for ( k=0; k<rules[i].subrules[j].bccnt; ++k )
		rules[i].subrules[j].bci[k] = getushort(ttf);
	    rules[i].subrules[j].ccnt = getushort(ttf);
	    if ( rules[i].subrules[j].ccnt<0 ) {
		LogError( _("Bad class count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].classindeces = galloc(rules[i].subrules[j].ccnt*sizeof(uint16));
	    rules[i].subrules[j].classindeces[0] = i;
	    for ( k=1; k<rules[i].subrules[j].ccnt; ++k )
		rules[i].subrules[j].classindeces[k] = getushort(ttf);
	    rules[i].subrules[j].fccnt = getushort(ttf);
	    if ( rules[i].subrules[j].fccnt<0 ) {
		LogError( _("Bad class count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].fci = galloc(rules[i].subrules[j].fccnt*sizeof(uint16));
	    for ( k=0; k<rules[i].subrules[j].fccnt; ++k )
		rules[i].subrules[j].fci[k] = getushort(ttf);
	    rules[i].subrules[j].scnt = getushort(ttf);
	    if ( rules[i].subrules[j].scnt<0 ) {
		LogError( _("Bad count in contextual chaining sub-table.\n") );
		info->bad_ot = true;
		free(rules);
return;
	    }
	    rules[i].subrules[j].sl = galloc(rules[i].subrules[j].scnt*sizeof(struct seqlookup));
	    for ( k=0; k<rules[i].subrules[j].scnt; ++k ) {
		rules[i].subrules[j].sl[k].seq = getushort(ttf);
		if ( rules[i].subrules[j].sl[k].seq >= rules[i].subrules[j].ccnt )
		    if ( !warned2 ) {
			LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d max=%d\n"),
				rules[i].subrules[j].sl[k].seq, rules[i].subrules[j].ccnt-1);
			info->bad_ot = true;
			warned2 = true;
		    }
		rules[i].subrules[j].sl[k].lookup = (void *) (intpt) getushort(ttf);
	    }
	}
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_chainpos : pst_chainsub;
	fpst->format = pst_class;
	fpst->subtable = subtable;
	subtable->fpst = fpst;
	fpst->next = info->possub;
	info->possub = fpst;

	fpst->rules = rule = gcalloc(cnt,sizeof(struct fpst_rule));
	fpst->rule_cnt = cnt;

	class = getClassDefTable(ttf, stoffset+classoff, info);
	fpst->nccnt = ClassFindCnt(class,info->glyph_cnt);
	fpst->nclass = ClassToNames(info,fpst->nccnt,class,info->glyph_cnt);

	/* Just in case they used the coverage table to redefine class 0 */
	glyphs = getCoverageTable(ttf,stoffset+coverage,info);
	fpst->nclass[0] = CoverageMinusClasses(glyphs,class,info);
	free(glyphs); free(class); class = NULL;

	/* The docs don't mention this, but in mangal.ttf fclassoff==0 NULL */
	if ( bclassoff!=0 )
	    class = getClassDefTable(ttf, stoffset+bclassoff, info);
	else
	    class = gcalloc(info->glyph_cnt,sizeof(uint16));
	fpst->bccnt = ClassFindCnt(class,info->glyph_cnt);
	fpst->bclass = ClassToNames(info,fpst->bccnt,class,info->glyph_cnt);
	free(class);
	if ( fclassoff!=0 )
	    class = getClassDefTable(ttf, stoffset+fclassoff, info);
	else
	    class = gcalloc(info->glyph_cnt,sizeof(uint16));
	fpst->fccnt = ClassFindCnt(class,info->glyph_cnt);
	fpst->fclass = ClassToNames(info,fpst->fccnt,class,info->glyph_cnt);
	free(class);

	cnt = 0;
	for ( i=0; i<rcnt; ++i ) for ( j=0; j<rules[i].scnt; ++j ) {
	    rule[cnt].u.class.nclasses = rules[i].subrules[j].classindeces;
	    rule[cnt].u.class.ncnt = rules[i].subrules[j].ccnt;
	    rules[i].subrules[j].classindeces = NULL;
	    rule[cnt].u.class.bclasses = rules[i].subrules[j].bci;
	    rule[cnt].u.class.bcnt = rules[i].subrules[j].bccnt;
	    rules[i].subrules[j].bci = NULL;
	    rule[cnt].u.class.fclasses = rules[i].subrules[j].fci;
	    rule[cnt].u.class.fcnt = rules[i].subrules[j].fccnt;
	    rules[i].subrules[j].fci = NULL;
	    rule[cnt].lookup_cnt = rules[i].subrules[j].scnt;
	    rule[cnt].lookups = rules[i].subrules[j].sl;
	    rules[i].subrules[j].sl = NULL;
	    for ( k=0; k<rule[cnt].lookup_cnt; ++k )
		ProcessSubLookups(ttf,info,gpos,alllooks,&rule[cnt].lookups[k]);
	    ++cnt;
	}
    }

    for ( i=0; i<rcnt; ++i ) {
	for ( j=0; j<rules[i].scnt; ++j ) {
	    free(rules[i].subrules[j].classindeces);
	    free(rules[i].subrules[j].sl);
	}
	free(rules[i].subrules);
    }
    free(rules);
}

static void g___ContextSubTable3(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, k, scnt, gcnt;
    uint16 *coverage;
    struct seqlookup *sl;
    uint16 *glyphs;
    FPST *fpst;
    struct fpst_rule *rule;
    int warned2 = false;
    (void)l; /* for -Wall */
    gcnt = getushort(ttf);
    scnt = getushort(ttf);
    if ( feof(ttf) ) {
	LogError( _("End of file in context chaining sub-table.\n") );
	info->bad_ot = true;
return;
    }
    coverage = galloc(gcnt*sizeof(uint16));
    for ( i=0; i<gcnt; ++i )
	coverage[i] = getushort(ttf);
    sl = galloc(scnt*sizeof(struct seqlookup));
    for ( k=0; k<scnt; ++k ) {
	sl[k].seq = getushort(ttf);
	if ( sl[k].seq >= gcnt && !warned2 ) {
	    LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d, max=%d\n"),
		    sl[k].seq, gcnt-1 );
	    info->bad_ot = true;
	    warned2 = true;
	}
	sl[k].lookup = (void *) (intpt) getushort(ttf);
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_contextpos : pst_contextsub;
	fpst->format = pst_coverage;
	fpst->subtable = subtable;
	subtable->fpst = fpst;
	fpst->next = info->possub;
	info->possub = fpst;

	fpst->rules = rule = gcalloc(1,sizeof(struct fpst_rule));
	fpst->rule_cnt = 1;
	rule->u.coverage.ncnt = gcnt;
	rule->u.coverage.ncovers = galloc(gcnt*sizeof(char **));
	for ( i=0; i<gcnt; ++i ) {
	    glyphs =  getCoverageTable(ttf,stoffset+coverage[i],info);
	    rule->u.coverage.ncovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}
	rule->lookup_cnt = scnt;
	rule->lookups = sl;
	for ( k=0; k<scnt; ++k )
	    ProcessSubLookups(ttf,info,gpos,alllooks,&sl[k]);
    }

    free(coverage);
}

static void g___ChainingSubTable3(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks, int gpos) {
    int i, k, scnt, gcnt, bcnt, fcnt;
    uint16 *coverage, *bcoverage, *fcoverage;
    struct seqlookup *sl;
    uint16 *glyphs;
    FPST *fpst;
    struct fpst_rule *rule;
    int warned2 = false;
    (void)l; /* for -Wall */
    bcnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("End of file in context chaining subtable.\n") );
	info->bad_ot = true;
return;
    }
    bcoverage = galloc(bcnt*sizeof(uint16));
    for ( i=0; i<bcnt; ++i )
	bcoverage[i] = getushort(ttf);
    gcnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("End of file in context chaining subtable.\n") );
	info->bad_ot = true;
return;
    }
    coverage = galloc(gcnt*sizeof(uint16));
    for ( i=0; i<gcnt; ++i )
	coverage[i] = getushort(ttf);
    fcnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("End of file in context chaining subtable.\n") );
	info->bad_ot = true;
return;
    }
    fcoverage = galloc(fcnt*sizeof(uint16));
    for ( i=0; i<fcnt; ++i )
	fcoverage[i] = getushort(ttf);
    scnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("End of file in context chaining subtable.\n") );
	info->bad_ot = true;
return;
    }
    sl = galloc(scnt*sizeof(struct seqlookup));
    for ( k=0; k<scnt; ++k ) {
	sl[k].seq = getushort(ttf);
	if ( sl[k].seq >= gcnt && !warned2 ) {
	    LogError( _("Attempt to apply a lookup to a location out of the range of this contextual\n lookup seq=%d, max=%d\n"),
		    sl[k].seq, gcnt-1 );
	    info->bad_ot = true;
	    warned2 = true;
	}
	sl[k].lookup = (void *) (intpt) getushort(ttf);
    }

    if ( justinuse==git_justinuse ) {
	/* Nothing to do. This lookup doesn't really reference any glyphs */
	/*  any lookups it invokes will be processed on their own */
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = gpos ? pst_chainpos : pst_chainsub;
	fpst->format = pst_coverage;
	fpst->subtable = subtable;
	subtable->fpst = fpst;
	fpst->next = info->possub;
	info->possub = fpst;

	fpst->rules = rule = gcalloc(1,sizeof(struct fpst_rule));
	fpst->rule_cnt = 1;

	rule->u.coverage.bcnt = bcnt;
	rule->u.coverage.bcovers = galloc(bcnt*sizeof(char **));
	for ( i=0; i<bcnt; ++i ) {
	    glyphs =  getCoverageTable(ttf,stoffset+bcoverage[i],info);
	    rule->u.coverage.bcovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}

	rule->u.coverage.ncnt = gcnt;
	rule->u.coverage.ncovers = galloc(gcnt*sizeof(char **));
	for ( i=0; i<gcnt; ++i ) {
	    glyphs =  getCoverageTable(ttf,stoffset+coverage[i],info);
	    rule->u.coverage.ncovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}

	rule->u.coverage.fcnt = fcnt;
	rule->u.coverage.fcovers = galloc(fcnt*sizeof(char **));
	for ( i=0; i<fcnt; ++i ) {
	    glyphs =  getCoverageTable(ttf,stoffset+fcoverage[i],info);
	    rule->u.coverage.fcovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}

	rule->lookup_cnt = scnt;
	rule->lookups = sl;
	for ( k=0; k<scnt; ++k )
	    ProcessSubLookups(ttf,info,gpos,alllooks,&sl[k]);
    }

    free(bcoverage);
    free(coverage);
    free(fcoverage);
}

static void gposContextSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable,
	struct lookup *alllooks) {
    switch( getushort(ttf)) {
      case 1:
	g___ContextSubTable1(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
      case 2:
	g___ContextSubTable2(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
      case 3:
	g___ContextSubTable3(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
    }
}

static void gposChainingSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable,
	struct lookup *alllooks) {
    switch( getushort(ttf)) {
      case 1:
	g___ChainingSubTable1(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
      case 2:
	g___ChainingSubTable2(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
      case 3:
	g___ChainingSubTable3(ttf,stoffset,info,l,subtable,git_normal,alllooks,true);
      break;
    }
}

static struct { uint32 tag; char *str; } tagstr[] = {
    { CHR('v','r','t','2'), "vert" },
    { CHR('s','m','c','p'), "sc" },
    { CHR('s','m','c','p'), "small" },
    { CHR('o','n','u','m'), "oldstyle" },
    { CHR('s','u','p','s'), "superior" },
    { CHR('s','u','b','s'), "inferior" },
    { CHR('s','w','s','h'), "swash" },
    { 0, NULL }
};


static void gsubSimpleSubTable(FILE *ttf, int stoffset, struct ttfinfo *info,
	struct lookup *l, struct lookup_subtable *subtable, int justinuse) {
    int coverage, cnt, i, j, which;
    uint16 format;
    uint16 *glyphs, *glyph2s=NULL;
    int delta=0;

    format=getushort(ttf);
    if ( format!=1 && format!=2 )	/* Unknown subtable format */
return;
    coverage = getushort(ttf);
    if ( format==1 ) {
	delta = getushort(ttf);
    } else {
	cnt = getushort(ttf);
	glyph2s = galloc(cnt*sizeof(uint16));
	for ( i=0; i<cnt; ++i )
	    glyph2s[i] = getushort(ttf);
	    /* in range check comes later */
    }
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    if ( glyphs==NULL ) {
	free(glyph2s);
return;
    }
    if ( justinuse==git_findnames ) {
	FeatureScriptLangList *fl;
	fl = l->otlookup->features;
	/* Unnamed glyphs get a name built of the base name and the feature tag */
	/*  assuming this lookup is tagged with a feature... */
	if ( fl!=NULL )
	for ( i=0; glyphs[i]!=0xffff; ++i ) if ( glyphs[i]<info->glyph_cnt ) {
	    if ( info->chars[glyphs[i]]->name!=NULL ) {
		which = format==1 ? (uint16) (glyphs[i]+delta) : glyph2s[i];
		if ( which<info->glyph_cnt && which>=0 && info->chars[which]!=NULL &&
			info->chars[which]->name==NULL ) {
		    char *basename = info->chars[glyphs[i]]->name;
		    char *str;
		    char tag[5], *pt=tag;
		    for ( j=0; tagstr[j].tag!=0 && tagstr[j].tag!=fl->featuretag; ++j );
		    if ( tagstr[j].tag!=0 )
			pt = tagstr[j].str;
		    else {
			tag[0] = fl->featuretag>>24;
			if ( (tag[1] = (fl->featuretag>>16)&0xff)==' ' ) tag[1] = '\0';
			if ( (tag[2] = (fl->featuretag>>8)&0xff)==' ' ) tag[2] = '\0';
			if ( (tag[3] = (fl->featuretag)&0xff)==' ' ) tag[3] = '\0';
			tag[4] = '\0';
			pt = tag;
		    }
		    str = galloc(strlen(basename)+strlen(pt)+2);
		    sprintf(str,"%s.%s", basename, pt );
		    info->chars[which]->name = str;
		}
	    }
	}
    } else if ( justinuse==git_justinuse ) {
	for ( i=0; glyphs[i]!=0xffff; ++i ) if ( glyphs[i]<info->glyph_cnt ) {
	    info->inuse[glyphs[i]]= true;
	    which = format==1 ? (uint16) (glyphs[i]+delta) : glyph2s[i];
	    info->inuse[which]= true;
	}
    } else if ( justinuse==git_normal ) {
	for ( i=0; glyphs[i]!=0xffff; ++i ) if ( glyphs[i]<info->glyph_cnt && info->chars[glyphs[i]]!=NULL ) {
	    which = format==1 ? (uint16) (glyphs[i]+delta) : glyph2s[i];
	    if ( which>=info->glyph_cnt ) {
		LogError( _("Bad substitution glyph: GID %d not less than %d\n"),
			which, info->glyph_cnt);
		info->bad_ot = true;
		which = 0;
	    }
	    if ( info->chars[which]!=NULL ) {	/* Might be in a ttc file */
		PST *pos = chunkalloc(sizeof(PST));
		pos->type = pst_substitution;
		pos->subtable = subtable;
		pos->next = info->chars[glyphs[i]]->possub;
		info->chars[glyphs[i]]->possub = pos;
		pos->u.subs.variant = copy(info->chars[which]->name);
	    }
	}
    }
    subtable->per_glyph_pst_or_kern = true;
    free(glyph2s);
    free(glyphs);
}

/* Multiple and alternate substitution lookups have the same format */
static void gsubMultipleSubTable(FILE *ttf, int stoffset, struct ttfinfo *info,
	struct lookup *l, struct lookup_subtable *subtable, int justinuse) {
    int coverage, cnt, i, j, len, max;
    uint16 format;
    uint16 *offsets;
    uint16 *glyphs, *glyph2s;
    char *pt;
    int bad;
    int badcnt = 0;

    if ( justinuse==git_findnames )
return;

    format=getushort(ttf);
    if ( format!=1 )	/* Unknown subtable format */
return;
    coverage = getushort(ttf);
    cnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("Unexpected end of file in GSUB sub-table.\n"));
	info->bad_ot = true;
return;
    }
    offsets = galloc(cnt*sizeof(uint16));
    for ( i=0; i<cnt; ++i )
	offsets[i] = getushort(ttf);
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    if ( glyphs==NULL ) {
	free(offsets);
return;
    }
    for ( i=0; glyphs[i]!=0xffff; ++i );
    if ( i!=cnt ) {
	LogError( _("Coverage table specifies a different number of glyphs than the sub-table expects.\n" ));
	info->bad_ot = true;
	if ( cnt<i )
	    glyphs[cnt] = 0xffff;
	else
	    cnt = i;
    }
    max = 20;
    glyph2s = galloc(max*sizeof(uint16));
    for ( i=0; glyphs[i]!=0xffff; ++i ) {
	PST *alt;
	fseek(ttf,stoffset+offsets[i],SEEK_SET);
	cnt = getushort(ttf);
	if ( feof(ttf)) {
	    LogError( _("Unexpected end of file in GSUB sub-table.\n"));
	    info->bad_ot = true;
return;
	}
	if ( cnt>max ) {
	    max = cnt+30;
	    glyph2s = grealloc(glyph2s,max*sizeof(uint16));
	}
	len = 0; bad = false;
	for ( j=0; j<cnt; ++j ) {
	    glyph2s[j] = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Unexpected end of file in GSUB sub-table.\n" ));
		info->bad_ot = true;
return;
	    }
	    if ( glyph2s[j]>=info->glyph_cnt ) {
		if ( !justinuse )
		    LogError( _("Bad Multiple/Alternate substitution glyph. GID %d not less than %d\n"),
			    glyph2s[j], info->glyph_cnt );
		info->bad_ot = true;
		if ( ++badcnt>20 )
return;
		glyph2s[j] = 0;
	    }
	    if ( justinuse==git_justinuse )
		/* Do Nothing */;
	    else if ( info->chars[glyph2s[j]]==NULL )
		bad = true;
	    else
		len += strlen( info->chars[glyph2s[j]]->name) +1;
	}
	if ( justinuse==git_justinuse ) {
	    info->inuse[glyphs[i]] = 1;
	    for ( j=0; j<cnt; ++j )
		info->inuse[glyph2s[j]] = 1;
	} else if ( info->chars[glyphs[i]]!=NULL && !bad ) {
	    alt = chunkalloc(sizeof(PST));
	    alt->type = l->otlookup->lookup_type==gsub_multiple?pst_multiple:pst_alternate;
	    alt->subtable = subtable;
	    alt->next = info->chars[glyphs[i]]->possub;
	    info->chars[glyphs[i]]->possub = alt;
	    pt = alt->u.subs.variant = galloc(len+1);
	    *pt = '\0';
	    for ( j=0; j<cnt; ++j ) {
		strcat(pt,info->chars[glyph2s[j]]->name);
		strcat(pt," ");
	    }
	    if ( *pt!='\0' && pt[strlen(pt)-1]==' ' )
		pt[strlen(pt)-1] = '\0';
	}
    }
    subtable->per_glyph_pst_or_kern = true;
    free(glyphs);
    free(glyph2s);
    free(offsets);
}

static void gsubLigatureSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse) {
    int coverage, cnt, i, j, k, lig_cnt, cc, len;
    uint16 *ls_offsets, *lig_offsets;
    uint16 *glyphs, *lig_glyphs, lig;
    char *pt;
    PST *liga;

    /* Format = */ getushort(ttf);
    coverage = getushort(ttf);
    cnt = getushort(ttf);
    if ( feof(ttf)) {
	LogError( _("Unexpected end of file in GSUB ligature sub-table.\n" ));
	info->bad_ot = true;
return;
    }
    ls_offsets = galloc(cnt*sizeof(uint16));
    for ( i=0; i<cnt; ++i )
	ls_offsets[i]=getushort(ttf);
    glyphs = getCoverageTable(ttf,stoffset+coverage,info);
    if ( glyphs==NULL )
return;
    for ( i=0; i<cnt; ++i ) {
	fseek(ttf,stoffset+ls_offsets[i],SEEK_SET);
	lig_cnt = getushort(ttf);
	if ( feof(ttf)) {
	    LogError( _("Unexpected end of file in GSUB ligature sub-table.\n" ));
	    info->bad_ot = true;
return;
	}
	lig_offsets = galloc(lig_cnt*sizeof(uint16));
	for ( j=0; j<lig_cnt; ++j )
	    lig_offsets[j] = getushort(ttf);
	if ( feof(ttf)) {
	    LogError( _("Unexpected end of file in GSUB ligature sub-table.\n" ));
	    info->bad_ot = true;
return;
	}
	for ( j=0; j<lig_cnt; ++j ) {
	    fseek(ttf,stoffset+ls_offsets[i]+lig_offsets[j],SEEK_SET);
	    lig = getushort(ttf);
	    if ( lig>=info->glyph_cnt ) {
		LogError( _("Bad ligature glyph. GID %d not less than %d\n"),
			lig, info->glyph_cnt );
		info->bad_ot = true;
		lig = 0;
	    }
	    cc = getushort(ttf);
	    if ( cc<0 || cc>100 ) {
		LogError( _("Unlikely count of ligature components (%d), I suspect this ligature sub-\n table is garbage, I'm giving up on it.\n"), cc );
		info->bad_ot = true;
		free(glyphs); free(lig_offsets);
return;
	    }
	    lig_glyphs = galloc(cc*sizeof(uint16));
	    lig_glyphs[0] = glyphs[i];
	    for ( k=1; k<cc; ++k ) {
		lig_glyphs[k] = getushort(ttf);
		if ( lig_glyphs[k]>=info->glyph_cnt ) {
		    if ( justinuse==git_normal )
			LogError( _("Bad ligature component glyph. GID %d not less than %d (in ligature %d)\n"),
				lig_glyphs[k], info->glyph_cnt, lig );
		    info->bad_ot = true;
		    lig_glyphs[k] = 0;
		}
	    }
	    if ( justinuse==git_justinuse ) {
		info->inuse[lig] = 1;
		for ( k=0; k<cc; ++k )
		    info->inuse[lig_glyphs[k]] = 1;
	    } else if ( justinuse==git_findnames ) {
		FeatureScriptLangList *fl = l->otlookup->features;
		/* If our ligature glyph has no name (and its components do) */
		/*  give it a name by concatenating components with underscores */
		/*  between them, and appending the tag */
		if ( fl!=NULL && info->chars[lig]!=NULL && info->chars[lig]->name==NULL ) {
		    int len=0;
		    for ( k=0; k<cc; ++k ) {
			if ( info->chars[lig_glyphs[k]]==NULL || info->chars[lig_glyphs[k]]->name==NULL )
		    break;
			len += strlen(info->chars[lig_glyphs[k]]->name)+1;
		    }
		    if ( k==cc ) {
			char *str = galloc(len+6), *pt;
			char tag[5];
			tag[0] = fl->featuretag>>24;
			if ( (tag[1] = (fl->featuretag>>16)&0xff)==' ' ) tag[1] = '\0';
			if ( (tag[2] = (fl->featuretag>>8)&0xff)==' ' ) tag[2] = '\0';
			if ( (tag[3] = (fl->featuretag)&0xff)==' ' ) tag[3] = '\0';
			tag[4] = '\0';
			*str='\0';
			for ( k=0; k<cc; ++k ) {
			    strcat(str,info->chars[lig_glyphs[k]]->name);
			    strcat(str,"_");
			}
			pt = str+strlen(str);
			pt[-1] = '.';
			strcpy(pt,tag);
			info->chars[lig]->name = str;
		    }
		}
	    } else if ( info->chars[lig]!=NULL ) {
		for ( k=len=0; k<cc; ++k )
		    if ( lig_glyphs[k]<info->glyph_cnt &&
			    info->chars[lig_glyphs[k]]!=NULL )
			len += strlen(info->chars[lig_glyphs[k]]->name)+1;
		liga = chunkalloc(sizeof(PST));
		liga->type = pst_ligature;
		liga->subtable = subtable;
		liga->next = info->chars[lig]->possub;
		info->chars[lig]->possub = liga;
		liga->u.lig.lig = info->chars[lig];
		liga->u.lig.components = pt = galloc(len);
		for ( k=0; k<cc; ++k ) {
		    if ( lig_glyphs[k]<info->glyph_cnt &&
			    info->chars[lig_glyphs[k]]!=NULL ) {
			strcpy(pt,info->chars[lig_glyphs[k]]->name);
			pt += strlen(pt);
			*pt++ = ' ';
		    }
		}
		pt[-1] = '\0';
	    }
	    free(lig_glyphs);
	}
	free(lig_offsets);
    }
    subtable->per_glyph_pst_or_kern = true;
    free(ls_offsets); free(glyphs);
}

static void gsubContextSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks) {
    if ( justinuse==git_findnames )
return;		/* Don't give names to these guys, they might not be unique */
	/* ie. because these are context based there is not a one to one */
	/*  mapping between input glyphs and output glyphs. One input glyph */
	/*  may go to several output glyphs (depending on context) and so */
	/*  <input-glyph-name>"."<tag-name> would be used for several glyphs */
    switch( getushort(ttf)) {
      case 1:
	g___ContextSubTable1(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
      case 2:
	g___ContextSubTable2(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
      case 3:
	g___ContextSubTable3(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
    }
}

static void gsubChainingSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks) {
    if ( justinuse==git_findnames )
return;		/* Don't give names to these guys, the names might not be unique */
    switch( getushort(ttf)) {
      case 1:
	g___ChainingSubTable1(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
      case 2:
	g___ChainingSubTable2(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
      case 3:
	g___ChainingSubTable3(ttf,stoffset,info,l,subtable,justinuse,alllooks,false);
      break;
    }
}

static void gsubReverseChainSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse) {
    int scnt, bcnt, fcnt, i;
    uint16 coverage, *bcoverage, *fcoverage, *sglyphs, *glyphs;
    FPST *fpst;
    struct fpst_rule *rule;
    (void)l; /* for -Wall */
    if ( justinuse==git_findnames )
return;		/* Don't give names to these guys, they might not be unique */
    if ( getushort(ttf)!=1 )
return;		/* Don't understand this format type */

    coverage = getushort(ttf);
    bcnt = getushort(ttf);
    bcoverage = galloc(bcnt*sizeof(uint16));
    for ( i = 0 ; i<bcnt; ++i )
	bcoverage[i] = getushort(ttf);
    fcnt = getushort(ttf);
    fcoverage = galloc(fcnt*sizeof(uint16));
    for ( i = 0 ; i<fcnt; ++i )
	fcoverage[i] = getushort(ttf);
    scnt = getushort(ttf);
    sglyphs = galloc((scnt+1)*sizeof(uint16));
    for ( i = 0 ; i<scnt; ++i )
	if (( sglyphs[i] = getushort(ttf))>=info->glyph_cnt ) {
	    LogError( _("Bad reverse contextual chaining substitution glyph: %d is not less than %d\n"),
		    sglyphs[i], info->glyph_cnt );
	    info->bad_ot = true;
	    sglyphs[i] = 0;
	}
    sglyphs[i] = 0xffff;

    if ( justinuse==git_justinuse ) {
	for ( i = 0 ; i<scnt; ++i )
	    info->inuse[sglyphs[i]] = 1;
    } else {
	fpst = chunkalloc(sizeof(FPST));
	fpst->type = pst_reversesub;
	fpst->format = pst_reversecoverage;
	fpst->subtable = subtable;
	fpst->next = info->possub;
	info->possub = fpst;
	subtable->fpst = fpst;

	fpst->rules = rule = gcalloc(1,sizeof(struct fpst_rule));
	fpst->rule_cnt = 1;

	rule->u.rcoverage.always1 = 1;
	rule->u.rcoverage.bcnt = bcnt;
	rule->u.rcoverage.fcnt = fcnt;
	rule->u.rcoverage.ncovers = galloc(sizeof(char *));
	rule->u.rcoverage.bcovers = galloc(bcnt*sizeof(char *));
	rule->u.rcoverage.fcovers = galloc(fcnt*sizeof(char *));
	rule->u.rcoverage.replacements = GlyphsToNames(info,sglyphs,false);
	glyphs = getCoverageTable(ttf,stoffset+coverage,info);
	rule->u.rcoverage.ncovers[0] = GlyphsToNames(info,glyphs,false);
	free(glyphs);
	for ( i=0; i<bcnt; ++i ) {
	    glyphs = getCoverageTable(ttf,stoffset+bcoverage[i],info);
	    rule->u.rcoverage.bcovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}
	for ( i=0; i<fcnt; ++i ) {
	    glyphs = getCoverageTable(ttf,stoffset+fcoverage[i],info);
	    rule->u.rcoverage.fcovers[i] = GlyphsToNames(info,glyphs,true);
	    free(glyphs);
	}
	rule->lookup_cnt = 0;		/* substitution lookups needed for reverse chaining */
    }
    free(sglyphs);
    free(fcoverage);
    free(bcoverage);
}

static void readttfsizeparameters(FILE *ttf,int32 broken_pos,int32 correct_pos,
	struct ttfinfo *info) {
    int32 here;
    /* Both of the two fonts I've seen that contain a 'size' feature */
    /*  have multiple features all of which point to the same parameter */
    /*  area. Odd. */
    /* When Adobe first released fonts containing the 'size' feature */
    /*  they did not follow the spec, and the offset to the size parameters */
    /*  was relative to the wrong location. They claim (Aug 2006) that */
    /*  this has been fixed. Be prepared to read either style of 'size' */
    /*  following the heuristics Adobe provides */
    int32 test[2];
    int i, nid;

    if ( info->last_size_pos==broken_pos || info->last_size_pos==correct_pos )
return;

    if ( info->last_size_pos!=0 ) {
	LogError( _("This font, %s, has multiple GPOS 'size' features. I'm not sure how to interpret that. I shall pick one arbitrarily.\n"),
		info->fontname==NULL? _("<Untitled>") : info->fontname );
	info->bad_ot = true;
return;
    }

    test[0] = correct_pos; test[1] = broken_pos;
    here = ftell(ttf);
    for ( i=0; i<2; ++i ) {
	fseek(ttf,test[i],SEEK_SET);
	info->last_size_pos = test[i];
	info->design_size = getushort(ttf);
	if ( info->design_size==0 )
    continue;
	info->fontstyle_id = getushort(ttf);
	nid = getushort(ttf);
	info->design_range_bottom = getushort(ttf);
	info->design_range_top = getushort(ttf);
	if ( info->fontstyle_id == 0 && nid==0 &&
		info->design_range_bottom==0 && info->design_range_top==0 ) {
	    /* Reasonable spec, only design size provided */
	    info->fontstyle_name = NULL;
    break;
	}
	if ( info->design_size < info->design_range_bottom ||
		info->design_size > info->design_range_top ||
		info->design_range_bottom > info->design_range_top ||
		nid<256 || nid>32767 )
    continue;
	info->fontstyle_name = FindAllLangEntries(ttf,info,nid);
	if ( info->fontstyle_name==NULL )
    continue;
	else
    break;
    }
    if ( i==2 ) {
	LogError(_("The 'size' feature does not seem to follow the standard,\nnor does it conform to Adobe's early misinterpretation of\nthe standard. I cannot parse it.\n") );
	info->bad_ot = true;
	info->design_size = info->design_range_bottom = info->design_range_top = info->fontstyle_id = 0;
	info->fontstyle_name = NULL;
    } else if ( i==1 ) {
	LogError(_("The 'size' feature of this font conforms to Adobe's early misinterpretation of the otf standard.\n") );
    }
    fseek(ttf,here,SEEK_SET);

#if 0
 printf( "pos=%d  size=%g, range=(%g,%g] id=%d name=%d\n", pos,
	 info->design_size/10.0, info->design_range_bottom/10.0, info->design_range_top/10.0,
	 info->fontstyle_id, info->fontstyle_name );
#endif
}

static struct scripts *readttfscripts(FILE *ttf,int32 pos, struct ttfinfo *info, int isgpos) {
    int i,j,k,cnt;
    int deflang, lcnt;
    struct scripts *scripts;

    if ( pos>=(int32)info->g_bounds ) {
	LogError(_("Attempt to read script data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
	info->bad_ot = true;
return( NULL );
    }
    fseek(ttf,pos,SEEK_SET);
    cnt = getushort(ttf);
    if ( cnt<=0 )
return( NULL );
    else if ( cnt>1000 ) {
	LogError( _("Too many scripts %d\n"), cnt );
	info->bad_ot = true;
return( NULL );
    }

    scripts = gcalloc(cnt+1,sizeof(struct scripts));
    for ( i=0; i<cnt; ++i ) {
	scripts[i].tag = getlong(ttf);
	scripts[i].offset = getushort(ttf);
    }
    for ( i=0; i<cnt; ++i ) {
	fseek(ttf,pos+scripts[i].offset,SEEK_SET);
	deflang = getushort(ttf);
	lcnt = getushort(ttf);
	lcnt += (deflang!=0);
	scripts[i].langcnt = lcnt;
	scripts[i].languages = gcalloc(lcnt+1,sizeof(struct language));
	j = 0;
	if ( deflang!=0 ) {
	    scripts[i].languages[0].tag = CHR('d','f','l','t');
	    scripts[i].languages[0].offset = deflang+scripts[i].offset;
	    ++j;
	}
	for ( ; j<lcnt; ++j ) {
	    scripts[i].languages[j].tag = getlong(ttf);
	    scripts[i].languages[j].offset = scripts[i].offset+getushort(ttf);
	}
	for ( j=0; j<lcnt; ++j ) {
	    if ( pos+scripts[i].languages[j].offset>=info->g_bounds ) {
		LogError(_("Attempt to read script data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
		info->bad_ot = true;
return( NULL );
	    }
	    fseek(ttf,pos+scripts[i].languages[j].offset,SEEK_SET);
	    (void) getushort(ttf);	/* lookup ordering table undefined */
	    scripts[i].languages[j].req = getushort(ttf);
	    scripts[i].languages[j].fcnt = getushort(ttf);
	    if ( feof(ttf)) {
		LogError(_("End of file when reading scripts in %s table"), isgpos ? "GPOS" : "GSUB" );
		info->bad_ot = true;
return( NULL );
	    }
	    scripts[i].languages[j].features = galloc(scripts[i].languages[j].fcnt*sizeof(uint16));
	    for ( k=0; k<scripts[i].languages[j].fcnt; ++k )
		scripts[i].languages[j].features[k] = getushort(ttf);
	}
    }

    if ( feof(ttf)) {
	LogError(_("End of file in %s table"), isgpos ? "GPOS" : "GSUB" );
	info->bad_ot = true;
return( NULL );
    }

return( scripts );
}

static struct feature *readttffeatures(FILE *ttf,int32 pos,int isgpos, struct ttfinfo *info) {
    /* read the features table returning an array containing all interesting */
    /*  features */
    int cnt;
    int i,j;
    struct feature *features;
    int parameters;

    if ( pos>=(int32)info->g_bounds ) {
	LogError(_("Attempt to read feature data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
	info->bad_ot = true;
return( NULL );
    }
    fseek(ttf,pos,SEEK_SET);
    info->feature_cnt = cnt = getushort(ttf);
    if ( cnt<=0 )
return( NULL );
    else if ( cnt>1000 ) {
	LogError( _("Too many features %d\n"), cnt );
	info->bad_ot = true;
return( NULL );
    }

    features = gcalloc(cnt+1,sizeof(struct feature));
    for ( i=0; i<cnt; ++i ) {
	features[i].tag = getlong(ttf);
	features[i].offset = getushort(ttf);
    }

    for ( i=0; i<cnt; ++i ) {
	if ( pos+features[i].offset>=info->g_bounds ) {
	    LogError(_("Attempt to read feature data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
	    info->bad_ot = true;
return( NULL );
	}
	fseek(ttf,pos+features[i].offset,SEEK_SET);
	parameters = getushort(ttf);
	if ( features[i].tag==CHR('s','i','z','e') && parameters!=0 && !feof(ttf))
	    readttfsizeparameters(ttf,pos+parameters,
		    pos+parameters+features[i].offset,info);
	features[i].lcnt = getushort(ttf);
	if ( feof(ttf) ) {
	    LogError(_("End of file when reading features in %s table"), isgpos ? "GPOS" : "GSUB" );
	    info->bad_ot = true;
return( NULL );
	}
	features[i].lookups = galloc(features[i].lcnt*sizeof(uint16));
	for ( j=0; j<features[i].lcnt; ++j )
	    features[i].lookups[j] = getushort(ttf);
    }

return( features );
}

static struct lookup *readttflookups(FILE *ttf,int32 pos, struct ttfinfo *info, int isgpos) {
    int cnt,i,j;
    struct lookup *lookups;
    OTLookup *otlookup, *last=NULL;
    struct lookup_subtable *st;

    if ( pos>=(int32)info->g_bounds ) {
	LogError(_("Attempt to read lookup data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
	info->bad_ot = true;
return( NULL );
    }

    fseek(ttf,pos,SEEK_SET);
    info->lookup_cnt = cnt = getushort(ttf);
    info->cur_lookups = NULL;
    if ( cnt<=0 )
return( NULL );
    else if ( cnt>1000 ) {
	LogError( _("Too many lookups %d\n"), cnt );
	info->bad_ot = true;
return( NULL );
    }

    lookups = gcalloc(cnt+1,sizeof(struct lookup));
    for ( i=0; i<cnt; ++i )
	lookups[i].offset = getushort(ttf);
    for ( i=0; i<cnt; ++i ) {
	if ( pos+lookups[i].offset>=info->g_bounds ) {
	    LogError(_("Attempt to read lookup data beyond end of %s table"), isgpos ? "GPOS" : "GSUB" );
	    info->bad_ot = true;
return( NULL );
	}
	fseek(ttf,pos+lookups[i].offset,SEEK_SET);
	lookups[i].type = getushort(ttf);
	lookups[i].flags = getushort(ttf);
	lookups[i].subtabcnt = getushort(ttf);
	lookups[i].subtab_offsets = galloc(lookups[i].subtabcnt*sizeof(int32));
	for ( j=0; j<lookups[i].subtabcnt; ++j )
	    lookups[i].subtab_offsets[j] = pos+lookups[i].offset+getushort(ttf);

	lookups[i].otlookup = otlookup = chunkalloc(sizeof(OTLookup));
	otlookup->lookup_index = i;
	if ( last==NULL )
	    info->cur_lookups = otlookup;
	else
	    last->next = otlookup;
	last = otlookup;
	otlookup->lookup_type = (isgpos<<8) | lookups[i].type;
	otlookup->lookup_flags = lookups[i].flags;
	otlookup->lookup_index = i;
	if ( feof(ttf) ) {
	    LogError(_("End of file when reading lookups in %s table"), isgpos ? "GPOS" : "GSUB" );
	    info->bad_ot = true;
return( NULL );
	}
	for ( j=0; j<lookups[i].subtabcnt; ++j ) {
	    st = chunkalloc(sizeof(struct lookup_subtable));
	    st->next = otlookup->subtables;
	    st->lookup = otlookup;
	    otlookup->subtables = st;
	}
    }
    if ( isgpos )
	info->gpos_lookups = info->cur_lookups;
    else
	info->gsub_lookups = info->cur_lookups;
return( lookups );
}

static void tagLookupsWithFeature(uint32 script_tag,uint32 lang_tag,
	int required_feature, struct feature *feature, struct lookup *lookups,
	struct ttfinfo *info) {
    uint32 feature_tag = required_feature ? REQUIRED_FEATURE : feature->tag;
    int i;
    OTLookup *otlookup;
    FeatureScriptLangList *fl;

    /* The otf docs are ambiguous as to the capitalization of the default */
    /*  script. The capitalized version is correct (uncapitalized is used for languages) */
    if ( script_tag == DEFAULT_LANG )
	script_tag = DEFAULT_SCRIPT;

    for ( i=0; i < feature->lcnt; ++i ) {
	if ( feature->lookups[i]>=info->lookup_cnt ) {
	    LogError( _("Lookup out of bounds in feature table.\n") );
	    info->bad_ot = true;
	} else {
	    otlookup = lookups[feature->lookups[i]].otlookup;
	    for ( fl = otlookup->features; fl!=NULL && fl->featuretag!=feature_tag; fl=fl->next );
	    if ( fl==NULL ) {
		fl = chunkalloc(sizeof(FeatureScriptLangList));
		fl->featuretag = feature_tag;
		fl->next = otlookup->features;
		otlookup->features = fl;
	    }
	    FListAppendScriptLang(fl,script_tag,lang_tag);
	}
    }
}

static void tagLookupsWithScript(struct scripts *scripts,
	struct feature *features, struct lookup *lookups,struct ttfinfo *info ) {
    int i,j;
    struct scripts *s;
    struct language *lang;
    struct lookup *l;

    if ( scripts==NULL || features==NULL )
return;		/* Legal, I'd guess, but not very interesting. Perhaps all lookups are controlled by the JSTF table or something */

    /* First tag every lookup with all script, lang, feature combinations that*/
    /*  invoke it */
    for ( s=scripts; s->tag!=0; ++s ) {
	for ( lang=s->languages, i=0; i<s->langcnt; ++i, ++lang ) {
	    if ( lang->req==0xffff )
		/* Do Nothing */;
	    else if ( lang->req>= info->feature_cnt ) {
		LogError( _("Required feature out of bounds in script table.\n") );
		info->bad_ot = true;
	    } else
		tagLookupsWithFeature(s->tag,lang->tag,true,&features[lang->req],
			lookups,info);
	    for ( j=0; j<lang->fcnt; ++j ) {
		if ( lang->features[j]>=info->feature_cnt ) {
		    LogError( _("Feature out of bounds in script table.\n") );
		    info->bad_ot = true;
		} else
		    tagLookupsWithFeature(s->tag,lang->tag,false,&features[lang->features[j]],
			    lookups,info);
	    }
	}
    }

    /* The scripts got added backwards so reverse to put them in */
    /*  alphabetic order again */
    for ( l=lookups, i=0; l->offset!=0; ++l, ++i ) {
	OTLookup *otl = l->otlookup;
	FeatureScriptLangList *fl;
	struct scriptlanglist *sl, *next, *prev;
	for ( fl=otl->features; fl!=NULL; fl=fl->next ) {
	    prev = NULL;
	    for ( sl=fl->scripts; sl!=NULL; sl = next ) {
		next = sl->next;
		sl->next = prev;
		prev = sl;
	    }
	    fl->scripts = prev;
	}
    }
}

static void gposExtensionSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable,
	struct lookup *alllooks) {
    uint32 base = ftell(ttf), st, offset;
    int lu_type;
    (void)stoffset; /* for -Wall */
    /* Format = */ getushort(ttf);
    lu_type = getushort(ttf);
    offset = getlong(ttf);

    l->otlookup->lookup_type = 0x100|lu_type;

    fseek(ttf,st = base+offset,SEEK_SET);
    switch ( lu_type ) {
      case 1:
	gposSimplePos(ttf,st,info,l,subtable);
      break;
      case 2:
	gposKernSubTable(ttf,st,info,l,subtable);
      break;
      case 3:
	gposCursiveSubTable(ttf,st,info,l,subtable);
      break;
      case 4: case 5: case 6:
	gposMarkSubTable(ttf,st,info,l,subtable);
      break;
      case 7:
	gposContextSubTable(ttf,st,info,l,subtable,alllooks);
      break;
      case 8:
	gposChainingSubTable(ttf,st,info,l,subtable,alllooks);
      break;
      case 9:
	LogError( _("This font is erroneous: it has a GPOS extension subtable that points to\nanother extension sub-table.\n") );
	info->bad_ot = true;
      break;
/* Any cases added here also need to go in the gposLookupSwitch */
      default:
	LogError( _("Unknown GPOS sub-table type: %d\n"), lu_type );
	info->bad_ot = true;
      break;
    }
    if ( ftell(ttf)>info->gpos_start+info->gpos_length ) {
	LogError( _("Subtable extends beyond end of GPOS table\n") );
	info->bad_ot = true;
    }
}

static void gsubExtensionSubTable(FILE *ttf, int stoffset,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks) {
    uint32 base = ftell(ttf), st, offset;
    int lu_type;
    (void)stoffset; /* for -Wall */
    /* Format = */ getushort(ttf);
    lu_type = getushort(ttf);
    offset = getlong(ttf);

    l->otlookup->lookup_type = lu_type;

    fseek(ttf,st = base+offset,SEEK_SET);
    switch ( lu_type ) {
      case 1:
	gsubSimpleSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case 2: case 3:	/* Multiple and alternate have same format, different semantics */
	gsubMultipleSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case 4:
	gsubLigatureSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case 5:
	gsubContextSubTable(ttf,st,info,l,subtable,justinuse,alllooks);
      break;
      case 6:
	gsubChainingSubTable(ttf,st,info,l,subtable,justinuse,alllooks);
      break;
      case 7:
	LogError( _("This font is erroneous: it has a GSUB extension subtable that points to\nanother extension sub-table.\n") );
	info->bad_ot = true;
      break;
      case 8:
	gsubReverseChainSubTable(ttf,st,info,l,subtable,justinuse);
      break;
/* Any cases added here also need to go in the gsubLookupSwitch */
      default:
	LogError( _("Unknown GSUB sub-table type: %d\n"), lu_type );
	info->bad_ot = true;
      break;
    }
    if ( ftell(ttf)>info->gsub_start+info->gsub_length ) {
	LogError( _("Subtable extends beyond end of GSUB table\n") );
	info->bad_ot = true;
    }
}

static void gposLookupSwitch(FILE *ttf, int st,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable,
	struct lookup *alllooks) {

    switch ( l->type | 0x100 ) {
      case gpos_single:
	gposSimplePos(ttf,st,info,l,subtable);
      break;
      case gpos_pair:
	gposKernSubTable(ttf,st,info,l,subtable);
      break;
      case gpos_cursive:
	gposCursiveSubTable(ttf,st,info,l,subtable);
      break;
      case gpos_mark2base: case gpos_mark2ligature: case gpos_mark2mark:
	gposMarkSubTable(ttf,st,info,l,subtable);
      break;
      case gpos_context:
	gposContextSubTable(ttf,st,info,l,subtable,alllooks);
      break;
      case gpos_contextchain:
	gposChainingSubTable(ttf,st,info,l,subtable,alllooks);
      break;
      case 0x109:
	gposExtensionSubTable(ttf,st,info,l,subtable,alllooks);
      break;
/* Any cases added here also need to go in the gposExtensionSubTable */
      default:
	LogError( _("Unknown GPOS sub-table type: %d\n"), l->otlookup->lookup_type );
	info->bad_ot = true;
      break;
    }
    if ( ftell(ttf)>info->gpos_start+info->gpos_length ) {
	LogError( _("Subtable extends beyond end of GPOS table\n") );
	info->bad_ot = true;
    }
}

static void gsubLookupSwitch(FILE *ttf, int st,
	struct ttfinfo *info, struct lookup *l, struct lookup_subtable *subtable, int justinuse,
	struct lookup *alllooks) {

    switch ( l->type ) {
      case gsub_single:
	gsubSimpleSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case gsub_multiple: case gsub_alternate:	/* Multiple and alternate have same format, different semantics */
	gsubMultipleSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case gsub_ligature:
	gsubLigatureSubTable(ttf,st,info,l,subtable,justinuse);
      break;
      case gsub_context:
	gsubContextSubTable(ttf,st,info,l,subtable,justinuse,alllooks);
      break;
      case gsub_contextchain:
	gsubChainingSubTable(ttf,st,info,l,subtable,justinuse,alllooks);
      break;
      case 7:
	gsubExtensionSubTable(ttf,st,info,l,subtable,justinuse,alllooks);
      break;
      case gsub_reversecchain:
	gsubReverseChainSubTable(ttf,st,info,l,subtable,justinuse);
      break;
/* Any cases added here also need to go in the gsubExtensionSubTable */
      default:
	LogError( _("Unknown GSUB sub-table type: %d\n"), l->otlookup->lookup_type );
	info->bad_ot = true;
      break;
    }
    if ( ftell(ttf)>info->g_bounds ) {
	LogError( _("Subtable extends beyond end of GSUB table\n" ));
	info->bad_ot = true;
    }
}

static void ScriptsFree(struct scripts *scripts) {
    int i,j;

    if ( scripts==NULL )
return;
    for ( i=0; scripts[i].offset!=0 ; ++i ) {
	for ( j=0; j<scripts[i].langcnt; ++j )
	    free( scripts[i].languages[j].features);
	free(scripts[i].languages);
    }
    free(scripts);
}

static void FeaturesFree(struct feature *features) {
    int i;

    if ( features==NULL )
return;
    for ( i=0; features[i].offset!=0 ; ++i )
	free(features[i].lookups);
    free(features);
}

static void LookupsFree(struct lookup *lookups) {
    int i;

    for ( i=0; lookups[i].offset!=0 ; ++i ) {
	free( lookups[i].subtab_offsets );
    }
    free(lookups);
}

static void ProcessGPOSGSUB(FILE *ttf,struct ttfinfo *info,int gpos,int inusetype) {
    int k;
    int32 base, lookup_start, st;
    int32 script_off, feature_off;
    struct scripts *scripts;
    struct feature *features;
    struct lookup *lookups, *l;
    struct lookup_subtable *subtable;

    if ( gpos ) {
	base = info->gpos_start;
	info->g_bounds = base + info->gpos_length;
    } else {
	base = info->gsub_start;
	info->g_bounds = base + info->gsub_length;
    }
    fseek(ttf,base,SEEK_SET);
    /* version = */ getlong(ttf);
    script_off = getushort(ttf);
    feature_off = getushort(ttf);
    lookup_start = base+getushort(ttf);

    scripts = readttfscripts(ttf,base+script_off,info,gpos);
    features = readttffeatures(ttf,base+feature_off,gpos,info);
    /* It is legal to have lookups with no features or scripts */
    /* For example if all the lookups were controlled by the JSTF table */
    lookups = readttflookups(ttf,lookup_start,info,gpos);
    if ( lookups==NULL ) {
	ScriptsFree(scripts);
	FeaturesFree(features);
return;
    }
    tagLookupsWithScript(scripts,features,lookups,info);
    ScriptsFree(scripts); scripts = NULL;
    FeaturesFree(features); features = NULL;

    for ( l = lookups; l->offset!=0; ++l ) {
	for ( k=0, subtable=l->otlookup->subtables; k<l->subtabcnt; ++k, subtable=subtable->next ) {
	    st = l->subtab_offsets[k];
	    fseek(ttf,st,SEEK_SET);
	    if ( gpos ) {
		gposLookupSwitch(ttf,st,info,l,subtable,lookups);
	    } else {
		gsubLookupSwitch(ttf,st,info,l,subtable,inusetype,lookups);
	    }
	}
    }

    /* Then generate some user-friendly names for the all the lookups */
    if ( inusetype==git_normal )
	for ( l=lookups; l->offset!=0; ++l )
	    NameOTLookup(l->otlookup,NULL);

    LookupsFree(lookups);
    if ( inusetype!=git_normal && !gpos ) {
	OTLookupListFree(info->gsub_lookups);
	info->gsub_lookups = info->cur_lookups = NULL;
    }
}

void readttfgsubUsed(FILE *ttf,struct ttfinfo *info) {
    ProcessGPOSGSUB(ttf,info,false,git_justinuse);
    info->g_bounds = 0;
}

void GuessNamesFromGSUB(FILE *ttf,struct ttfinfo *info) {
    ProcessGPOSGSUB(ttf,info,false,git_findnames);
    info->g_bounds = 0;
}

void readttfgpossub(FILE *ttf,struct ttfinfo *info,int gpos) {
    ProcessGPOSGSUB(ttf,info,gpos,git_normal);
    info->g_bounds = 0;
}

void readttfgdef(FILE *ttf,struct ttfinfo *info) {
    int lclo, gclass, mac;
    int coverage, cnt, i,j, format;
    uint16 *glyphs, *lc_offsets, *offsets;
    uint32 caret_base;
    PST *pst;
    SplineChar *sc;

    fseek(ttf,info->gdef_start,SEEK_SET);
    if ( getlong(ttf)!=0x00010000 )
return;
    info->g_bounds = info->gdef_start + info->gdef_length;
    gclass = getushort(ttf);
    /* attach list = */ getushort(ttf);
    lclo = getushort(ttf);		/* ligature caret list */
    mac = getushort(ttf);		/* mark attach class */

    if ( gclass!=0 ) {
	uint16 *gclasses = getClassDefTable(ttf,info->gdef_start+gclass, info);
	for ( i=0; i<info->glyph_cnt; ++i )
	    if ( info->chars[i]!=NULL && gclasses[i]!=0 )
		info->chars[i]->glyph_class = gclasses[i]+1;
	free(gclasses);
    }

    if ( mac!=0 ) {
	uint16 *mclasses = getClassDefTable(ttf,info->gdef_start+mac, info);
	const char *format_spec = _("MarkClass-%d");
	info->mark_class_cnt = ClassFindCnt(mclasses,info->glyph_cnt);
	info->mark_classes = ClassToNames(info,info->mark_class_cnt,mclasses,info->glyph_cnt);
	info->mark_class_names = galloc(info->mark_class_cnt*sizeof(char *));
	info->mark_class_names[0] = NULL;
	for ( i=1; i<info->mark_class_cnt; ++i ) {
	    info->mark_class_names[i] = galloc((strlen(format_spec)+10));
	    sprintf( info->mark_class_names[i], format_spec, i );
	}
	free(mclasses);
    }

    if ( lclo!=0 ) {
	lclo += info->gdef_start;
	fseek(ttf,lclo,SEEK_SET);
	coverage = getushort(ttf);
	cnt = getushort(ttf);
	if ( cnt==0 )
return;
	lc_offsets = galloc(cnt*sizeof(uint16));
	for ( i=0; i<cnt; ++i )
	    lc_offsets[i]=getushort(ttf);
	glyphs = getCoverageTable(ttf,lclo+coverage,info);
	if ( glyphs==NULL )
return;
	for ( i=0; i<cnt; ++i ) if ( glyphs[i]<info->glyph_cnt ) {
	    fseek(ttf,lclo+lc_offsets[i],SEEK_SET);
	    sc = info->chars[glyphs[i]];
	    for ( pst=sc->possub; pst!=NULL && pst->type!=pst_lcaret; pst=pst->next );
	    if ( pst==NULL ) {
		pst = chunkalloc(sizeof(PST));
		pst->next = sc->possub;
		sc->possub = pst;
		pst->type = pst_lcaret;
		pst->subtable = NULL;
		sc->lig_caret_cnt_fixed = true;
	    }
	    caret_base = ftell(ttf);
	    pst->u.lcaret.cnt = getushort(ttf);
	    if ( pst->u.lcaret.carets!=NULL ) free(pst->u.lcaret.carets);
	    offsets = galloc(pst->u.lcaret.cnt*sizeof(uint16));
	    for ( j=0; j<pst->u.lcaret.cnt; ++j )
		offsets[j] = getushort(ttf);
	    pst->u.lcaret.carets = galloc(pst->u.lcaret.cnt*sizeof(int16));
	    for ( j=0; j<pst->u.lcaret.cnt; ++j ) {
		fseek(ttf,caret_base+offsets[j],SEEK_SET);
		format=getushort(ttf);
		if ( format==1 ) {
		    pst->u.lcaret.carets[j] = getushort(ttf);
		} else if ( format==2 ) {
		    pst->u.lcaret.carets[j] = 0;
		    /* point = */ getushort(ttf);
		} else if ( format==3 ) {
		    pst->u.lcaret.carets[j] = getushort(ttf);
		    /* in device table = */ getushort(ttf);
		} else {
		    LogError( _("!!!! Unknown caret format %d !!!!\n"), format );
		    info->bad_ot = true;
		}
	    }
	    free(offsets);
	}
	free(lc_offsets);
	free(glyphs);
    }
    info->g_bounds = 0;
}

static void OTLAppend(struct ttfinfo *info,OTLookup *otl,int gpos) {
    OTLookup *prev;
    int pos=0;

    if ( gpos && info->gpos_lookups == NULL )
	info->gpos_lookups = otl;
    else if ( !gpos && info->gsub_lookups == NULL )
	info->gsub_lookups = otl;
    else {
	prev = gpos ? info->gpos_lookups : info->gsub_lookups;
	pos = 1;
	while ( prev->next!=NULL ) {
	    prev = prev->next;
	    ++pos;
	}
	prev->next = otl;
    }
    otl->lookup_index = pos;
}

static void OTLRemove(struct ttfinfo *info,OTLookup *otl,int gpos) {
    /* Remove the most recent lookup. We got bad data and can't use it */
    OTLookup *prev, **base;

    base = gpos ? &info->gpos_lookups : &info->gsub_lookups;
    if ( *base==otl )
	*base = NULL;
    else if ( *base!=NULL ) {
	for ( prev = *base; prev->next!=NULL && prev->next!=otl; prev = prev->next );
	prev->next = NULL;
    }
    OTLookupFree(otl);
}

static void InfoNameOTLookup(OTLookup *otl,struct ttfinfo *info) {
    SplineFont sf;

    memset(&sf,0,sizeof(sf));
    NameOTLookup(otl,&sf);
}

/* Apple's docs imply that kerning info is always provided left to right, even*/
/*  for right to left scripts. My guess is that their docs are wrong, as they */
/*  often are, but if that be so then we need code in here to reverse */
/*  the order of the characters for right to left since pfaedit's convention */
/*  is to follow writing order rather than to go left to right */
void readttfkerns(FILE *ttf,struct ttfinfo *info) {
    int tabcnt, len, coverage,i,j, npairs, version, format, flags_good, tab;
    int left, right, offset, array, rowWidth;
    int header_size;
    KernPair *kp;
    KernClass *kc;
    uint32 begin_table;
    uint16 *class1, *class2;
    int isv;
    OTLookup *otl;

    fseek(ttf,info->kern_start,SEEK_SET);
    version = getushort(ttf);
    tabcnt = getushort(ttf);
    if ( version!=0 ) {
	LogError(_("Invalid or unsupported version (0x%x) for 'kern' table"), version );
	info->bad_gx = true;
return;
    }
    for ( tab=0; tab<tabcnt; ++tab ) {
	begin_table = ftell(ttf);
	/* version = */ getushort(ttf);
	len = getushort(ttf);
	coverage = getushort(ttf);
	format = coverage>>8;
	flags_good = ((coverage&7)<=1);
	isv = !(coverage&1);
	header_size = 6;
	otl = NULL;
	if ( flags_good ) {
	    otl = chunkalloc(sizeof(OTLookup));
	    otl->lookup_type = gpos_pair;
	    otl->subtables = chunkalloc(sizeof(struct lookup_subtable));
	    otl->subtables->lookup = otl;
	    otl->subtables->per_glyph_pst_or_kern = true;
	    otl->subtables->vertical_kerning = isv;
	    otl->features = chunkalloc(sizeof(FeatureScriptLangList));
	    if (isv)
		otl->features->featuretag = CHR('v','k','r','n');
	    else
		otl->features->featuretag = CHR('k','e','r','n');
	    OTLAppend(info,otl,true);
	}
	if ( flags_good && format==0 ) {
	    /* format 0, horizontal kerning data (as pairs) not perpendicular */
	    SplineChar **chars = info->chars;
	    npairs = getushort(ttf);
	    if ( len-14 != 6*npairs || npairs>10920 ) {
		LogError( _("In the 'kern' table, a subtable's length does not match the number of kerning pairs.") );
		info->bad_gx = true;
	    }
	    /* searchRange = */ getushort(ttf);
	    /* entrySelector = */ getushort(ttf);
	    /* rangeShift = */ getushort(ttf);
	    otl->subtables[0].per_glyph_pst_or_kern = true;
	    for ( j=0; j<npairs; ++j ) {
		left = getushort(ttf);
		right = getushort(ttf);
		offset = (short) getushort(ttf);
		if ( left<0 || right<0 ) {
		    /* We've seen such buggy fonts... */
		    LogError( _("Bad kern pair: glyphs %d & %d mustn't be negative\n"),
			    left, right );
		    info->bad_gx = true;
		} else if ( left>=info->glyph_cnt || right>=info->glyph_cnt ) {
		    /* Holes happen when reading ttc files. They are probably ok */
		    LogError( _("Bad kern pair: glyphs %d & %d must be less than %d\n"),
			    left, right, info->glyph_cnt );
		    info->bad_gx = true;
		} else if (chars[left]==NULL || chars[right]==NULL ) {
                    /* Shouldn't happen. */
		    LogError( _("Bad kern pair: glyphs at %d & %d are null\n"),
			    left, right);
		    info->bad_gx = true;
		} else {
		    kp = chunkalloc(sizeof(KernPair));
		    kp->sc = chars[right];
		    kp->off = offset;
		    kp->subtable = otl->subtables;
		    FListsAppendScriptLang(otl->features,SCScriptFromUnicode(chars[left]),
			    DEFAULT_LANG);
		    if ( isv ) {
			kp->next = chars[left]->vkerns;
			chars[left]->vkerns = kp;
		    } else {
			kp->next = chars[left]->kerns;
			chars[left]->kerns = kp;
		    }
		}
	    }
	    InfoNameOTLookup(otl,info);
	} else if ( flags_good && (format==2 || format==3 )) {
	    /* two class based formats */
	    KernClass **khead, **klast;
	    if ( isv ) {
		khead = &info->vkhead;
		klast = &info->vklast;
	    } else {
		khead = &info->khead;
		klast = &info->klast;
	    }
	    if ( *khead==NULL )
		*khead = kc = chunkalloc(sizeof(KernClass));
	    else
		kc = (*klast)->next = chunkalloc(sizeof(KernClass));
	    *klast = kc;
	    if ( format==2 ) {
		rowWidth = getushort(ttf);
		left = getushort(ttf);
		right = getushort(ttf);
		array = getushort(ttf);
		kc->second_cnt = rowWidth/sizeof(uint16);
		class1 = getAppleClassTable(ttf, begin_table+left, info->glyph_cnt, array, rowWidth, info );
		class2 = getAppleClassTable(ttf, begin_table+right, info->glyph_cnt, 0, sizeof(uint16), info );
		for ( i=0; i<info->glyph_cnt; ++i )
		    if ( class1[i]>kc->first_cnt )
			kc->first_cnt = class1[i];
		++ kc->first_cnt;
		kc->offsets = galloc(kc->first_cnt*kc->second_cnt*sizeof(int16));
#ifdef FONTFORGE_CONFIG_DEVICETABLES
		kc->adjusts = gcalloc(kc->first_cnt*kc->second_cnt,sizeof(DeviceTable));
#endif
		fseek(ttf,begin_table+array,SEEK_SET);
		for ( i=0; i<kc->first_cnt*kc->second_cnt; ++i )
		    kc->offsets[i] = getushort(ttf);
	    } else {
		/* format 3, horizontal kerning data (as classes limited to 256 entries) */
		/*  OpenType's spec doesn't document this */
		int gc, kv, flags;
		int16 *kvs;
		gc = getushort(ttf);
		kv = getc(ttf);
		kc->first_cnt = getc(ttf);
		kc->second_cnt = getc(ttf);
		flags = getc(ttf);
		if ( gc>info->glyph_cnt ) {
		    LogError( _("Kerning subtable 3 says the glyph count is %d, but maxp says %d\n"),
			    gc, info->glyph_cnt );
		    info->bad_gx = true;
		}
		class1 = gcalloc(gc>info->glyph_cnt?gc:info->glyph_cnt,sizeof(uint16));
		class2 = gcalloc(gc>info->glyph_cnt?gc:info->glyph_cnt,sizeof(uint16));
		kvs = galloc(kv*sizeof(int16));
		kc->offsets = galloc(kc->first_cnt*kc->second_cnt*sizeof(int16));
#ifdef FONTFORGE_CONFIG_DEVICETABLES
		kc->adjusts = gcalloc(kc->first_cnt*kc->second_cnt,sizeof(DeviceTable));
#endif
		for ( i=0; i<kv; ++i )
		    kvs[i] = (int16) getushort(ttf);
		for ( i=0; i<gc; ++i )
		    class1[i] = getc(ttf);
		for ( i=0; i<gc; ++i )
		    class2[i] = getc(ttf);
		for ( i=0; i<kc->first_cnt*kc->second_cnt; ++i )
		    kc->offsets[i] = kvs[getc(ttf)];
		free(kvs);
	    }
	    kc->firsts = ClassToNames(info,kc->first_cnt,class1,info->glyph_cnt);
	    kc->seconds = ClassToNames(info,kc->second_cnt,class2,info->glyph_cnt);
	    for ( i=0; i<info->glyph_cnt; ++i ) {
		if ( class1[i]>=4 && info->chars[i]!=NULL )
		    FListsAppendScriptLang(otl->features,
			    SCScriptFromUnicode(info->chars[i]),
			    DEFAULT_LANG);
	    }
	    free(class1); free(class2);
	    fseek(ttf,begin_table+len,SEEK_SET);
	    otl->subtables[0].kc = kc;
	    kc->subtable = otl->subtables;
	    InfoNameOTLookup(otl,info);
	} else {
	    LogError(_("Invalid or unsupported format (%d) for subtable of 'kern' table"), format );
	    info->bad_gx = true;
	    fseek(ttf,len-header_size,SEEK_CUR);
	    if ( otl!=NULL )
		OTLRemove(info,otl,true);
	}
    }
}

/******************************************************************************/
/* ******************************* MATH Table ******************************* */
/* ********************** (Not strictly OpenType yet) *********************** */
/******************************************************************************/

/* ******************************** Read MATH ******************************* */

static void ttf_math_read_constants(FILE *ttf,struct ttfinfo *info, uint32 start) {
    struct MATH *math;
    int i;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
    uint16 off;
#endif

    fseek(ttf,start,SEEK_SET);
    info->math = math = gcalloc(1,sizeof(struct MATH));

    for ( i=0; math_constants_descriptor[i].script_name!=NULL; ++i ) {
	int16 *pos = (int16 *) (((char *) (math)) + math_constants_descriptor[i].offset );
	if ( pos == (int16 *) &math->MinConnectorOverlap )
    continue;		/* Actually lives in the Variant table, not here */
	*pos = getushort(ttf);
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	if ( math_constants_descriptor[i].devtab_offset >= 0 ) {
	    DeviceTable **devtab = (DeviceTable **) (((char *) (math)) + math_constants_descriptor[i].devtab_offset );
	    off = getushort(ttf);
	    if ( off!=0 ) {
		*devtab = chunkalloc(sizeof(DeviceTable));
		ReadDeviceTable(ttf,*devtab,start+off,info);
	    }
	}
#else
	/* No support for device tables, skip it */
	if ( math_constants_descriptor[i].devtab_offset != -1 )
	    (void) getushort(ttf);
#endif
    }
}

static void ttf_math_read_icta(FILE *ttf,struct ttfinfo *info, uint32 start, int is_ic) {
    /* The italic correction and top accent sub-tables have the same format */
    int coverage, cnt, i, val, offset;
    uint16 *glyphs;

    fseek(ttf,start,SEEK_SET);
    coverage = getushort(ttf);
    cnt = getushort(ttf);
    glyphs = getCoverageTable(ttf,start+coverage,info);
    if ( glyphs==NULL )
return;
    fseek(ttf,start+4,SEEK_SET);
    for ( i=0; i<cnt; ++i ) {
      val = (int16) getushort(ttf);
      offset = getushort(ttf);
      if ( glyphs[i]<info->glyph_cnt && info->chars[ glyphs[i]]!=NULL ) {
	if ( is_ic )
	    info->chars[ glyphs[i] ]->italic_correction = val;
	else
	    info->chars[ glyphs[i] ]->top_accent_horiz = val;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	if ( offset!=0 ) {
	    DeviceTable *dv = chunkalloc(sizeof(DeviceTable));
	    ReadDeviceTable(ttf,dv,start+offset,info);
	    if ( is_ic )
		info->chars[ glyphs[i] ]->italic_adjusts = dv;
	    else
		info->chars[ glyphs[i] ]->top_accent_adjusts = dv;
	}
#endif
      }
    }
    free(glyphs);
}

static void ttf_math_read_extended(FILE *ttf,struct ttfinfo *info, uint32 start) {
    int i;
    uint16 *glyphs;

    glyphs = getCoverageTable(ttf,start,info);
    if ( glyphs==NULL )
return;
    for ( i=0; glyphs[i]!=0xffff; ++i ) if ( glyphs[i]<info->glyph_cnt && info->chars[ glyphs[i]]!=NULL )
	info->chars[ glyphs[i] ]->is_extended_shape = true;
    free(glyphs);
}

static void ttf_math_read_mathkernv(FILE *ttf, uint32 start,struct mathkernvertex *mkv,
	SplineChar *sc, int istop, struct ttfinfo *info) {
    int cnt, i;
    (void)info; /* for -Wall */
    fseek(ttf,start,SEEK_SET);
    /* There is one more width than height. I store the width count */
    /*  and guess a dummy height later */
    mkv->cnt = cnt = getushort(ttf)+1;
    mkv->mkd = gcalloc(cnt,sizeof(struct mathkerndata));

    for ( i=0; i<cnt-1; ++i ) {
	mkv->mkd[i].height = getushort(ttf);
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	mkv->mkd[i].height_adjusts = (void *) (intpt) getushort(ttf);
#else
	(void) getushort(ttf);
#endif
    }

    for ( i=0; i<cnt; ++i ) {
	mkv->mkd[i].kern = getushort(ttf);
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	mkv->mkd[i].kern_adjusts = (void *) (intpt) getushort(ttf);
#else
	(void) getushort(ttf);
#endif
    }

#ifdef FONTFORGE_CONFIG_DEVICETABLES
    for ( i=0; i<cnt; ++i ) {
	DeviceTable *dv;
	uint32 offset;
	if ( mkv->mkd[i].height_adjusts!=NULL ) {
	    offset = start + (intpt) mkv->mkd[i].height_adjusts;
	    mkv->mkd[i].height_adjusts = dv = chunkalloc(sizeof(DeviceTable));
	    ReadDeviceTable(ttf,dv,offset,info);
	}
	if ( mkv->mkd[i].kern_adjusts!=NULL ) {
	    offset = start + (intpt) mkv->mkd[i].kern_adjusts;
	    mkv->mkd[i].kern_adjusts = dv = chunkalloc(sizeof(DeviceTable));
	    ReadDeviceTable(ttf,dv,offset,info);
	}
    }
#endif

    if ( cnt>=3 )
	mkv->mkd[cnt-1].height = 2*mkv->mkd[cnt-2].height - mkv->mkd[cnt-3].height;
    else if ( cnt>=2 )
	mkv->mkd[cnt-1].height = mkv->mkd[cnt-2].height + 100;
    else if ( cnt==1 ) {
	if ( istop ) {
	    DBounds b;
	    SplineCharQuickBounds(sc,&b);
	    mkv->mkd[cnt-1].height = b.maxy;
	} else
	    mkv->mkd[cnt-1].height = 0;
    }
}

static void ttf_math_read_mathkern(FILE *ttf,struct ttfinfo *info, uint32 start) {
    int coverage, cnt, i;
    uint16 *glyphs;
    struct koff { uint16 tr, tl, br, bl; } *koff;

    fseek(ttf,start,SEEK_SET);
    coverage = getushort(ttf);
    cnt = getushort(ttf);
    koff = galloc(cnt*sizeof(struct koff));
    for ( i=0; i<cnt; ++i ) {
	koff[i].tr = getushort(ttf);
	koff[i].tl = getushort(ttf);
	koff[i].br = getushort(ttf);
	koff[i].bl = getushort(ttf);
    }
    glyphs = getCoverageTable(ttf,start+coverage,info);
    if ( glyphs==NULL ) {
	free(koff);
return;
    }
    for ( i=0; i<cnt; ++i ) if ( glyphs[i]<info->glyph_cnt && info->chars[ glyphs[i]]!=NULL ) {
	SplineChar *sc = info->chars[ glyphs[i]];
	sc->mathkern = chunkalloc(sizeof(struct mathkern));
	if ( koff[i].tr!=0 )
	    ttf_math_read_mathkernv(ttf,start+koff[i].tr,&sc->mathkern->top_right,sc,true,info);
	if ( koff[i].tl!=0 )
	    ttf_math_read_mathkernv(ttf,start+koff[i].tl,&sc->mathkern->top_left,sc,true,info);
	if ( koff[i].br!=0 )
	    ttf_math_read_mathkernv(ttf,start+koff[i].br,&sc->mathkern->bottom_right,sc,false,info);
	if ( koff[i].bl!=0 )
	    ttf_math_read_mathkernv(ttf,start+koff[i].bl,&sc->mathkern->bottom_left,sc,false,info);
    }
    free(koff);
    free(glyphs);
}

static void ttf_math_read_glyphinfo(FILE *ttf,struct ttfinfo *info, uint32 start) {
    int icoff,taoff,esoff,kioff;

    fseek(ttf,start,SEEK_SET);
    icoff = getushort(ttf);
    taoff = getushort(ttf);
    esoff = getushort(ttf);
    kioff = getushort(ttf);

    if ( icoff!=0 )
	ttf_math_read_icta(ttf,info,start+icoff,true);
    if ( taoff!=0 )
	ttf_math_read_icta(ttf,info,start+taoff,false);
    if ( esoff!=0 )
	ttf_math_read_extended(ttf,info,start+esoff);
    if ( kioff!=0 )
	ttf_math_read_mathkern(ttf,info,start+kioff);
}

static struct glyphvariants *ttf_math_read_gvtable(FILE *ttf,struct ttfinfo *info, uint32 start,
	enum gsub_inusetype justinuse, SplineChar *basesc, int isv ) {
    struct glyphvariants *gv = chunkalloc(sizeof(struct glyphvariants));
    int ga_offset;
    int vcnt;
    uint16 *glyphs;
    int i, j, len;
    char *pt;
    int ic_offset, pcnt;
    SplineChar *sc;
    char ebuf[20], buffer[50], *ext;

    fseek(ttf,start,SEEK_SET);
    ga_offset = getushort(ttf);
    vcnt      = getushort(ttf);
    if ( vcnt!=0 ) {
	if ( justinuse==git_justinuse ) {
	    for ( i=0; i<vcnt; ++i ) {
		int gid = getushort(ttf);
		/* sizes[i] = */ getushort(ttf);
		if ( gid>=0 && gid<info->glyph_cnt )
		    info->inuse[gid] = true;
	    }
	} else if ( justinuse==git_findnames ) {
	    for ( i=0; i<vcnt; ++i ) {
		int gid = getushort(ttf);
		/* sizes[i] = */ getushort(ttf);
		if ( basesc!=NULL && basesc->name!=NULL &&
			gid>=0 && gid<info->glyph_cnt &&
			(sc = info->chars[gid])!=NULL && sc->name==NULL ) {
		    snprintf(buffer,sizeof(buffer),"%.30s.%csize%d",
			    basesc->name, isv?'v':'h', i);
		    sc->name = copy(buffer);
		}
	    }
	} else {
	    glyphs    = galloc(vcnt*sizeof(uint16));
	    len = 0;
	    for ( i=0; i<vcnt; ++i ) {
		glyphs[i]      = getushort(ttf);
		/* sizes[i] = */ getushort(ttf);
		if ( glyphs[i]<info->glyph_cnt && (sc = info->chars[ glyphs[i]])!=NULL )
		    len += strlen(sc->name)+1;
	    }
	    if ( len!=0 ) {
		gv->variants = pt = galloc(len);
		for ( i=len=0; i<vcnt; ++i ) {
		    if ( glyphs[i]<info->glyph_cnt && (sc = info->chars[ glyphs[i]])!=NULL ) {
			strcpy(pt+len,sc->name);
			len += strlen(sc->name);
			pt[len++] = ' ';
		    }
		}
		pt[len-1] = '\0';
	    }
	    free(glyphs);
	}
    }
    if ( ga_offset!=0 ) {
	start += ga_offset;
	fseek(ttf,start,SEEK_SET);
	gv->italic_correction = getushort(ttf);
	ic_offset = getushort(ttf);
	gv->part_cnt = pcnt = getushort(ttf);
	if ( justinuse==git_normal )
	    gv->parts = gcalloc(pcnt,sizeof(struct gv_part));
	for ( i=j=0; i<pcnt; ++i ) {
	    int gid, start, end, full, flags;
	    gid = getushort(ttf);
	    start = getushort(ttf);
	    end = getushort(ttf);
	    full = getushort(ttf);
	    flags = getushort(ttf);
	    if ( feof(ttf)) {
		LogError( _("Bad glyph variant subtable of MATH table.\n") );
		info->bad_ot = true;
		chunkfree(gv,sizeof(*gv));
return( NULL );
	    }
	    if ( justinuse==git_justinuse ) {
		if ( gid<info->glyph_cnt )
		    info->inuse[gid] = true;
	    } else if ( justinuse==git_findnames ) {
		if ( basesc!=NULL && basesc->name!=NULL &&
			gid>=0 && gid<info->glyph_cnt &&
			(sc = info->chars[gid])!=NULL && sc->name==NULL ) {
		    if ( pcnt==1 )
			ext = "repeat";
		    if ( i==0 )
			ext = isv ? "bot" : "left";
		    else if ( i==pcnt-1 )
			ext = isv ? "top" : "right";
		    else if ( i==1 && pcnt==3 )
			ext = "mid";
		    else {
			sprintf( ebuf, "%cpart%d", isv?'v':'h', i );
			ext = ebuf;
		    }
		    snprintf(buffer,sizeof(buffer),"%.30s.%s",
			    basesc->name, ext );
		    sc->name = copy(buffer);
		}
	    } else {
		if ( gid<info->glyph_cnt && (sc = info->chars[gid])!=NULL ) {
		    gv->parts[j].component = copy( sc->name );
		    gv->parts[j].startConnectorLength = start;
		    gv->parts[j].endConnectorLength = end;
		    gv->parts[j].fullAdvance = full;
		    gv->parts[j++].is_extender = flags&1;
		}
	    }
	}
	gv->part_cnt = j;
#ifdef FONTFORGE_CONFIG_DEVICETABLES
	if ( ic_offset!=0 && justinuse==git_normal ) {
	    gv->italic_adjusts = chunkalloc(sizeof(DeviceTable));
	    ReadDeviceTable(ttf,gv->italic_adjusts,start+ic_offset,info);
	}
#endif
    }
    if ( justinuse==git_justinuse ) {
	chunkfree(gv,sizeof(*gv));
return( NULL );
    }
return( gv );
}

static void ttf_math_read_variants(FILE *ttf,struct ttfinfo *info, uint32 start,
	enum gsub_inusetype justinuse) {
    int vcoverage, hcoverage, vcnt, hcnt;
    int *hoffs, *voffs;
    uint16 *hglyphs, *vglyphs;
    int i;

    fseek(ttf,start,SEEK_SET);
    if ( info->math==NULL )
	info->math = gcalloc(1,sizeof(struct MATH));
    info->math->MinConnectorOverlap = getushort(ttf);
    vcoverage = getushort(ttf);
    hcoverage = getushort(ttf);
    vcnt = getushort(ttf);
    hcnt = getushort(ttf);
    hoffs = galloc(hcnt*sizeof(int));
    voffs = galloc(vcnt*sizeof(int));

    for ( i=0; i<vcnt; ++i )
	voffs[i] = getushort(ttf);
    for ( i=0; i<hcnt; ++i )
	hoffs[i] = getushort(ttf);
    vglyphs = hglyphs = NULL;
    if ( vcoverage!=0 )
	vglyphs = getCoverageTable(ttf,start+vcoverage,info);
    if ( hcoverage!=0 )
	hglyphs = getCoverageTable(ttf,start+hcoverage,info);

    if ( vglyphs!=NULL ) {
	for ( i=0; i<vcnt; ++i ) if ( vglyphs[i]<info->glyph_cnt && voffs[i]!=0) {
	    if ( justinuse == git_normal || justinuse == git_findnames ) {
		SplineChar *sc = info->chars[ vglyphs[i]];
		if ( sc!=NULL )
		    sc->vert_variants = ttf_math_read_gvtable(ttf,info,start+voffs[i],justinuse,sc,true);
	    } else if ( info->inuse[ vglyphs[i]])
		ttf_math_read_gvtable(ttf,info,start+voffs[i],justinuse,NULL,true);
	}
    }
    if ( hglyphs!=NULL ) {
	for ( i=0; i<hcnt; ++i ) if ( hglyphs[i]<info->glyph_cnt && hoffs[i]!=0) {
	    if ( justinuse == git_normal || justinuse == git_findnames ) {
		SplineChar *sc = info->chars[ hglyphs[i]];
		if ( sc!=NULL )
		    sc->horiz_variants = ttf_math_read_gvtable(ttf,info,start+hoffs[i],justinuse,sc,false);
	    } else if ( info->inuse[ hglyphs[i]])
		    ttf_math_read_gvtable(ttf,info,start+hoffs[i],justinuse,NULL,false);
	}
    }

    free(vglyphs); free(voffs);
    free(hglyphs); free(hoffs);
}

static void _otf_read_math(FILE *ttf,struct ttfinfo *info,
	enum gsub_inusetype justinuse) {
    int constants, glyphinfo, variants;
    if ( info->math_start==0 )
return;
    fseek(ttf,info->math_start,SEEK_SET);

    info->g_bounds = info->math_start+info->math_length;

    if ( getlong(ttf)!=0x00010000 )
return;
    constants = getushort(ttf);
    glyphinfo = getushort(ttf);
    variants = getushort(ttf);

    if ( justinuse == git_normal ) {
	if ( constants!=0 )
	    ttf_math_read_constants(ttf,info,info->math_start+constants);
	if ( glyphinfo!=0 )
	    ttf_math_read_glyphinfo(ttf,info,info->math_start+glyphinfo);
    }
    if ( variants!=0 )
	ttf_math_read_variants(ttf,info,info->math_start+variants,justinuse);
    if ( ftell(ttf)>info->g_bounds ) {
	LogError("MATH table extends beyond table bounds");
	info->bad_ot = true;
    }
    info->g_bounds = 0;
}

void otf_read_math(FILE *ttf,struct ttfinfo *info) {
    _otf_read_math(ttf,info,git_normal);
}

void otf_read_math_used(FILE *ttf,struct ttfinfo *info) {
    _otf_read_math(ttf,info,git_justinuse);
}

void GuessNamesFromMATH(FILE *ttf,struct ttfinfo *info) {
    _otf_read_math(ttf,info,git_findnames);
}

static struct baselangextent *readttfbaseminmax(FILE *ttf,uint32 offset,struct ttfinfo *info,
	uint32 script_tag,uint32 lang_tag) {
    int j,feat_cnt;
    struct baselangextent *lang, *cur, *last;
    (void)info; /* for -Wall */
    (void)script_tag; /* for -Wall */
    fseek(ttf,offset,SEEK_SET);
    lang = chunkalloc(sizeof(struct baselangextent));
    lang->lang = lang_tag;
    lang->descent = (short) getushort(ttf);
    lang->ascent  = (short) getushort(ttf);

    feat_cnt = getushort(ttf);
    last = NULL;
    for ( j=0; j<feat_cnt; ++j ) {
	cur = chunkalloc(sizeof(struct baselangextent));
	if ( last==NULL )
	    lang->features = cur;
	else
	    last->next = cur;
	last = cur;
	cur->lang = getlong(ttf);		/* Actually feature tag here */
	cur->descent = (short) getushort(ttf);
	cur->ascent  = (short) getushort(ttf);
    }
return( lang );
}

void readttfbase(FILE *ttf,struct ttfinfo *info) {
    int version;
    uint32 axes[2];
    uint32 basetags, basescripts;
    int basescriptcnt;
    struct tagoff { uint32 tag; uint32 offset; } *bs;
    int axis,i,j, tot;
    struct Base *curBase;
    struct basescript *curScript, *last;
    struct baselangextent *cur, *lastLang;

    if ( info->base_start==0 )
return;
    fseek(ttf,info->base_start,SEEK_SET);

    version = getlong(ttf);
    if ( version!=0x00010000 )
return;
    axes[0] = getushort(ttf);	/* Horizontal */
    axes[1] = getushort(ttf);	/* Vertical */

    for ( axis=0; axis<2; ++axis ) {
	if ( axes[axis]==0 )
    continue;
	fseek(ttf,info->base_start+axes[axis],SEEK_SET);
	curBase = chunkalloc(sizeof(struct Base));
	if ( axis==0 ) info->horiz_base = curBase; else info->vert_base = curBase;
	basetags    = getushort(ttf);
	basescripts = getushort(ttf);
	if ( basetags==0 ) {
	    curBase->baseline_cnt = 0;
	    curBase->baseline_tags = NULL;
	} else {
	    fseek(ttf,info->base_start+axes[axis]+basetags,SEEK_SET);
	    curBase->baseline_cnt = getushort(ttf);
	    curBase->baseline_tags = gcalloc(curBase->baseline_cnt,sizeof(uint32));
	    for ( i=0; i<curBase->baseline_cnt; ++i )
		curBase->baseline_tags[i] = getlong(ttf);
	}
	if ( basescripts!=0 ) {
	    fseek(ttf,info->base_start+axes[axis]+basescripts,SEEK_SET);
	    basescriptcnt = getushort(ttf);
	    bs = gcalloc(basescriptcnt,sizeof(struct tagoff));
	    for ( i=0; i<basescriptcnt; ++i ) {
		bs[i].tag    = getlong(ttf);
		bs[i].offset = getushort(ttf);
		if ( bs[i].offset != 0 )
		    bs[i].offset += info->base_start+axes[axis]+basescripts;
	    }
	    last = NULL;
	    for ( i=0; i<basescriptcnt; ++i ) if ( bs[i].offset!=0 ) {
		int basevalues, defminmax;
		int langsyscnt;
		struct tagoff *ls;
		fseek(ttf,bs[i].offset,SEEK_SET);
		basevalues = getushort(ttf);
		defminmax  = getushort(ttf);
		langsyscnt = getushort(ttf);
		ls = gcalloc(langsyscnt,sizeof(struct tagoff));
		for ( j=0; j<langsyscnt; ++j ) {
		    ls[j].tag    = getlong(ttf);
		    ls[j].offset = getushort(ttf);
		}
		curScript = chunkalloc(sizeof(struct basescript));
		if ( last==NULL )
		    curBase->scripts = curScript;
		else
		    last->next = curScript;
		last = curScript;
		curScript->script = bs[i].tag;
		if ( basevalues!=0 ) {
		    int coordcnt;
		    int *coords;

		    fseek( ttf,bs[i].offset+basevalues,SEEK_SET);
		    curScript->def_baseline = getushort(ttf);
		    tot = coordcnt = getushort(ttf);
		    if ( coordcnt!=curBase->baseline_cnt ) {
			info->bad_ot = true;
			LogError( "!!!!! Coord count (%d) for '%c%c%c%c' script does not match base tag count (%d) in 'BASE' table\n",
				coordcnt,
				bs[i].tag>>24, bs[i].tag>>16, bs[i].tag>>8, bs[i].tag,
				curBase->baseline_cnt );
			if ( tot<curBase->baseline_cnt )
			    tot = curBase->baseline_cnt;
		    }
		    coords = gcalloc(coordcnt,sizeof(int));
		    curScript->baseline_pos = gcalloc(tot,sizeof(int16));
		    for ( j=0; j<coordcnt; ++j )
			coords[j] = getushort(ttf);
		    for ( j=0; j<coordcnt; ++j ) if ( coords[j]!=0 ) {
			int format;
			fseek( ttf,bs[i].offset+basevalues+coords[j],SEEK_SET);
			format = getushort(ttf);
			curScript->baseline_pos[j]  = (short) getushort(ttf);
			if ( format!=1 && format!=2 && format!=3 ) {
			    info->bad_ot = true;
			    LogError("!!!!! Bad Base Coord format (%d) for '%c%c%c%c' in '%c%c%c%c' script in 'BASE' table\n",
					format,
					curBase->baseline_tags[j]>>24, curBase->baseline_tags[j]>>16, curBase->baseline_tags[j]>>8, curBase->baseline_tags[j],
					bs[i].tag>>24, bs[i].tag>>16, bs[i].tag>>8, bs[i].tag );
			}
		    }
		    free(coords);
		}
		lastLang = NULL;
		if ( defminmax!=0 )
		    curScript->langs = lastLang = readttfbaseminmax(ttf,bs[i].offset+defminmax,info,bs[i].tag,DEFAULT_LANG);
		if ( langsyscnt!=0 ) {
		    for ( j=0; j<langsyscnt; ++j ) if ( ls[j].offset!=0 ) {
			cur = readttfbaseminmax(ttf,bs[i].offset+ls[j].offset,info,bs[i].tag,ls[j].tag);
			if ( last==NULL )
			    curScript->langs = cur;
			else
			    lastLang->next = cur;
			lastLang = cur;
		    }
		}
		free(ls);
	    }
   	    free(bs);
	}
    }
}