1 files changed, 135 insertions, 0 deletions
diff --git a/pdf/pdf_cmap_load.c b/pdf/pdf_cmap_load.c
new file mode 100644
index 00000000..eae52d8d
--- /dev/null
+++ b/pdf/pdf_cmap_load.c
@@ -0,0 +1,135 @@
+#include "fitz.h"
+#include "mupdf.h"
+
+/*
+ * Load CMap stream in PDF file
+ */
+fz_error
+pdf_loadembeddedcmap(pdf_cmap **cmapp, pdf_xref *xref, fz_obj *stmobj)
+{
+	fz_error error = fz_okay;
+	fz_stream *file = nil;
+	pdf_cmap *cmap = nil;
+	pdf_cmap *usecmap;
+	fz_obj *wmode;
+	fz_obj *obj;
+
+	if ((*cmapp = pdf_finditem(xref->store, pdf_dropcmap, stmobj)))
+	{
+		pdf_keepcmap(*cmapp);
+		return fz_okay;
+	}
+
+	pdf_logfont("load embedded cmap (%d %d R) {\n", fz_tonum(stmobj), fz_togen(stmobj));
+
+	error = pdf_openstream(&file, xref, fz_tonum(stmobj), fz_togen(stmobj));
+	if (error)
+	{
+		error = fz_rethrow(error, "cannot open cmap stream (%d %d R)", fz_tonum(stmobj), fz_togen(stmobj));
+		goto cleanup;
+	}
+
+	error = pdf_parsecmap(&cmap, file);
+	if (error)
+	{
+		error = fz_rethrow(error, "cannot parse cmap stream (%d %d R)", fz_tonum(stmobj), fz_togen(stmobj));
+		goto cleanup;
+	}
+
+	fz_close(file);
+
+	wmode = fz_dictgets(stmobj, "WMode");
+	if (fz_isint(wmode))
+	{
+		pdf_logfont("wmode %d\n", wmode);
+		pdf_setwmode(cmap, fz_toint(wmode));
+	}
+
+	obj = fz_dictgets(stmobj, "UseCMap");
+	if (fz_isname(obj))
+	{
+		pdf_logfont("usecmap /%s\n", fz_toname(obj));
+		error = pdf_loadsystemcmap(&usecmap, fz_toname(obj));
+		if (error)
+		{
+			error = fz_rethrow(error, "cannot load system usecmap '%s'", fz_toname(obj));
+			goto cleanup;
+		}
+		pdf_setusecmap(cmap, usecmap);
+		pdf_dropcmap(usecmap);
+	}
+	else if (fz_isindirect(obj))
+	{
+		pdf_logfont("usecmap (%d %d R)\n", fz_tonum(obj), fz_togen(obj));
+		error = pdf_loadembeddedcmap(&usecmap, xref, obj);
+		if (error)
+		{
+			error = fz_rethrow(error, "cannot load embedded usecmap (%d %d R)", fz_tonum(obj), fz_togen(obj));
+			goto cleanup;
+		}
+		pdf_setusecmap(cmap, usecmap);
+		pdf_dropcmap(usecmap);
+	}
+
+	pdf_logfont("}\n");
+
+	pdf_storeitem(xref->store, pdf_keepcmap, pdf_dropcmap, stmobj, cmap);
+
+	*cmapp = cmap;
+	return fz_okay;
+
+cleanup:
+	if (file)
+		fz_close(file);
+	if (cmap)
+		pdf_dropcmap(cmap);
+	return error; /* already rethrown */
+}
+
+/*
+ * Create an Identity-* CMap (for both 1 and 2-byte encodings)
+ */
+pdf_cmap *
+pdf_newidentitycmap(int wmode, int bytes)
+{
+	pdf_cmap *cmap = pdf_newcmap();
+	sprintf(cmap->cmapname, "Identity-%c", wmode ? 'V' : 'H');
+	pdf_addcodespace(cmap, 0x0000, 0xffff, bytes);
+	pdf_maprangetorange(cmap, 0x0000, 0xffff, 0);
+	pdf_sortcmap(cmap);
+	pdf_setwmode(cmap, wmode);
+	return cmap;
+}
+
+/*
+ * Load predefined CMap from system.
+ */
+fz_error
+pdf_loadsystemcmap(pdf_cmap **cmapp, char *cmapname)
+{
+	fz_error error;
+	pdf_cmap *usecmap;
+	pdf_cmap *cmap;
+	int i;
+
+	pdf_logfont("loading system cmap %s\n", cmapname);
+
+	for (i = 0; pdf_cmaptable[i]; i++)
+	{
+		if (!strcmp(cmapname, pdf_cmaptable[i]->cmapname))
+		{
+			cmap = pdf_cmaptable[i];
+			if (cmap->usecmapname[0] && !cmap->usecmap)
+			{
+				error = pdf_loadsystemcmap(&usecmap, cmap->usecmapname);
+				if (error)
+					return fz_rethrow(error, "cannot load usecmap: %s", cmap->usecmapname);
+				pdf_setusecmap(cmap, usecmap);
+			}
+			*cmapp = cmap;
+			return fz_okay;
+		}
+	}
+
+	return fz_throw("no builtin cmap file: %s", cmapname);
+}