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#include "fitz.h"
#include "mupdf.h"
/* Load or synthesize ToUnicode map for fonts */
fz_error
pdf_load_to_unicode(pdf_font_desc *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;
fz_context *ctx = xref->ctx;
if (pdf_is_stream(xref, fz_to_num(cmapstm), fz_to_gen(cmapstm)))
{
error = pdf_load_embedded_cmap(&cmap, xref, cmapstm);
if (error)
return fz_error_note(error, "cannot load embedded cmap (%d %d R)", fz_to_num(cmapstm), fz_to_gen(cmapstm));
font->to_unicode = pdf_new_cmap(ctx);
for (i = 0; i < (strings ? 256 : 65536); i++)
{
cid = pdf_lookup_cmap(font->encoding, i);
if (cid >= 0)
{
ucslen = pdf_lookup_cmap_full(cmap, i, ucsbuf);
if (ucslen == 1)
pdf_map_range_to_range(ctx, font->to_unicode, cid, cid, ucsbuf[0]);
if (ucslen > 1)
pdf_map_one_to_many(ctx, font->to_unicode, cid, ucsbuf, ucslen);
}
}
pdf_sort_cmap(ctx, font->to_unicode);
pdf_drop_cmap(ctx, cmap);
}
else if (collection)
{
error = fz_okay;
if (!strcmp(collection, "Adobe-CNS1"))
error = pdf_load_system_cmap(ctx, &font->to_unicode, "Adobe-CNS1-UCS2");
else if (!strcmp(collection, "Adobe-GB1"))
error = pdf_load_system_cmap(ctx, &font->to_unicode, "Adobe-GB1-UCS2");
else if (!strcmp(collection, "Adobe-Japan1"))
error = pdf_load_system_cmap(ctx, &font->to_unicode, "Adobe-Japan1-UCS2");
else if (!strcmp(collection, "Adobe-Korea1"))
error = pdf_load_system_cmap(ctx, &font->to_unicode, "Adobe-Korea1-UCS2");
if (error)
return fz_error_note(error, "cannot load ToUnicode system cmap %s-UCS2", collection);
}
if (strings)
{
/* TODO one-to-many mappings */
font->cid_to_ucs_len = 256;
font->cid_to_ucs = fz_calloc(ctx, 256, sizeof(unsigned short));
for (i = 0; i < 256; i++)
{
if (strings[i])
font->cid_to_ucs[i] = pdf_lookup_agl(strings[i]);
else
font->cid_to_ucs[i] = '?';
}
}
if (!font->to_unicode && !font->cid_to_ucs)
{
/* 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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