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#include "fitz.h"
#include "mupdf.h"
/* Load or synthesize ToUnicode map for fonts */
fz_error
pdf_loadtounicode(pdf_fontdesc *font, pdf_xref *xref,
char **strings, char *collection, fz_obj *cmapstm)
{
fz_error error = fz_okay;
pdf_cmap *cmap;
int cid;
int ucsbuf[8];
int ucslen;
int i;
if (pdf_isstream(xref, fz_tonum(cmapstm), fz_togen(cmapstm)))
{
pdf_logfont("tounicode embedded cmap\n");
error = pdf_loadembeddedcmap(&cmap, xref, cmapstm);
if (error)
return fz_rethrow(error, "cannot load embedded cmap (%d %d R)", fz_tonum(cmapstm), fz_togen(cmapstm));
font->tounicode = pdf_newcmap();
for (i = 0; i < (strings ? 256 : 65536); i++)
{
cid = pdf_lookupcmap(font->encoding, i);
if (cid >= 0)
{
ucslen = pdf_lookupcmapfull(cmap, i, ucsbuf);
if (ucslen == 1)
pdf_maprangetorange(font->tounicode, cid, cid, ucsbuf[0]);
if (ucslen > 1)
pdf_maponetomany(font->tounicode, cid, ucsbuf, ucslen);
}
}
pdf_sortcmap(font->tounicode);
pdf_dropcmap(cmap);
}
else if (collection)
{
pdf_logfont("tounicode cid collection (%s)\n", collection);
error = fz_okay;
if (!strcmp(collection, "Adobe-CNS1"))
error = pdf_loadsystemcmap(&font->tounicode, "Adobe-CNS1-UCS2");
else if (!strcmp(collection, "Adobe-GB1"))
error = pdf_loadsystemcmap(&font->tounicode, "Adobe-GB1-UCS2");
else if (!strcmp(collection, "Adobe-Japan1"))
error = pdf_loadsystemcmap(&font->tounicode, "Adobe-Japan1-UCS2");
else if (!strcmp(collection, "Adobe-Japan2"))
error = pdf_loadsystemcmap(&font->tounicode, "Adobe-Japan2-UCS2"); /* where's this? */
else if (!strcmp(collection, "Adobe-Korea1"))
error = pdf_loadsystemcmap(&font->tounicode, "Adobe-Korea1-UCS2");
if (error)
return fz_rethrow(error, "cannot load tounicode system cmap %s-UCS2", collection);
}
if (strings)
{
pdf_logfont("tounicode strings\n");
/* TODO one-to-many mappings */
font->ncidtoucs = 256;
font->cidtoucs = fz_calloc(256, sizeof(unsigned short));
for (i = 0; i < 256; i++)
{
if (strings[i])
font->cidtoucs[i] = pdf_lookupagl(strings[i]);
else
font->cidtoucs[i] = '?';
}
}
if (!font->tounicode && !font->cidtoucs)
{
pdf_logfont("tounicode could not be loaded\n");
/* TODO: synthesize a ToUnicode if it's a freetype font with
* cmap and/or post tables or if it has glyph names. */
}
return fz_okay;
}
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