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/* tfm.c */
/************************************************************************
Part of the dvipng distribution
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
Copyright (C) 2002-2009, 2019 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
bool ReadTFM(struct font_entry * tfontp, char* tfmname)
{
struct filemmap fmmap;
struct char_entry *tcharptr;
unsigned char *position;
int lh,bc,ec,nw, c;
dviunits* width;
DEBUG_PRINT((DEBUG_DVI|DEBUG_FT|DEBUG_TFM),
("\n OPEN METRICS:\t'%s'", tfmname));
if (MmapFile(tfmname,&fmmap)) return(false);
position=(unsigned char*)fmmap.data;
if (fmmap.size<10) Fatal("TFM file %s ends prematurely",tfmname);
lh = UNumRead(position+2,2);
bc = UNumRead(position+4,2);
ec = UNumRead(position+6,2);
nw = UNumRead(position+8,2);
DEBUG_PRINT(DEBUG_TFM,(" %d %d %d %d",lh,bc,ec,nw));
if (nw>0) {
unsigned char *end=(unsigned char *) fmmap.data+fmmap.size;
if ((width=malloc(nw*sizeof(dviunits)))==NULL)
Fatal("cannot allocate memory for TFM widths");
c=0;
position=position+24+(lh+ec-bc+1)*4;
while( c < nw ) {
if (position >= end - 4) Fatal("TFM file %s ends prematurely",tfmname);
width[c] = SNumRead(position,4);
c++;
position += 4;
}
/* Read char widths */
c=bc;
position=(unsigned char*)fmmap.data+24+lh*4;
while(c <= ec) {
if (position >= end) Fatal("TFM file %s ends prematurely",tfmname);
DEBUG_PRINT(DEBUG_TFM,("\n@%ld TFM METRICS:\t",
(long)((char *)position - fmmap.data)));
if ((tcharptr=malloc(sizeof(struct char_entry)))==NULL)
Fatal("cannot allocate memory for TFM char entry");
tcharptr->data=NULL;
if (*position < nw) {
tcharptr->tfmw=width[*position];
} else {
Fatal("TFM file %s lacks width for char %u", tfmname, *position);
}
DEBUG_PRINT(DEBUG_TFM,("%d [%d] %d",c,*position,tcharptr->tfmw));
tcharptr->tfmw = (dviunits)
((int64_t) tcharptr->tfmw * tfontp->s / (1 << 20));
DEBUG_PRINT(DEBUG_TFM,(" (%d)",tcharptr->tfmw));
if (c >= NFNTCHARS) /* Only positive for now */
Fatal("tfm file %s exceeds char numbering limit %u",tfmname,NFNTCHARS);
tfontp->chr[c] = tcharptr;
c++;
position += 4;
}
free(width);
}
UnMmapFile(&fmmap);
return(true);
}
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