Rearrange source files.

1 files changed, 77 insertions, 0 deletions

diff --git a/source/pdf/pdf-unicode.c b/source/pdf/pdf-unicode.c
new file mode 100644
index 00000000..694cbac6
--- /dev/null
+++ b/source/pdf/pdf-unicode.c
@@ -0,0 +1,77 @@
+#include "mupdf/pdf.h"
+
+/* Load or synthesize ToUnicode map for fonts */
+
+void
+pdf_load_to_unicode(pdf_document *xref, pdf_font_desc *font,
+	char **strings, char *collection, pdf_obj *cmapstm)
+{
+	pdf_cmap *cmap;
+	int cid;
+	int ucsbuf[8];
+	int ucslen;
+	int i;
+	fz_context *ctx = xref->ctx;
+
+	if (pdf_is_stream(xref, pdf_to_num(cmapstm), pdf_to_gen(cmapstm)))
+	{
+		cmap = pdf_load_embedded_cmap(xref, 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);
+		font->size += pdf_cmap_size(ctx, font->to_unicode);
+	}
+
+	else if (collection)
+	{
+		if (!strcmp(collection, "Adobe-CNS1"))
+			font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-CNS1-UCS2");
+		else if (!strcmp(collection, "Adobe-GB1"))
+			font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-GB1-UCS2");
+		else if (!strcmp(collection, "Adobe-Japan1"))
+			font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-Japan1-UCS2");
+		else if (!strcmp(collection, "Adobe-Korea1"))
+			font->to_unicode = pdf_load_system_cmap(ctx, "Adobe-Korea1-UCS2");
+
+		return;
+	}
+
+	if (strings)
+	{
+		/* TODO one-to-many mappings */
+
+		font->cid_to_ucs_len = 256;
+		font->cid_to_ucs = fz_malloc_array(ctx, 256, sizeof(unsigned short));
+		font->size += 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. */
+	}
+}