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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) 2002-2008 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif
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;
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));
width=alloca(nw*sizeof(dviunits));
c=0;
position=position+24+(lh+ec-bc+1)*4;
while( c < nw ) {
width[c] = SNumRead(position,4);
c++;
position += 4;
}
/* Read char widths */
c=bc;
position=(unsigned char*)fmmap.data+24+lh*4;
while(c <= ec) {
DEBUG_PRINT(DEBUG_TFM,("\n@%ld TFM METRICS:\t",
(long)position - (long)fmmap.data));
tcharptr=xmalloc(sizeof(struct char_entry));
tcharptr->data=NULL;
tcharptr->tfmw=width[*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",tfmname);
tfontp->chr[c] = tcharptr;
c++;
position += 4;
}
UnMmapFile(&fmmap);
return(true);
}
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