1 files changed, 48 insertions, 0 deletions
diff --git a/xref.c b/xref.c
new file mode 100644
index 0000000..edec384
--- /dev/null
+++ b/xref.c
@@ -0,0 +1,48 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsesfnt_parse_xref(
+			const char *data, size_t size,
+			struct libparsesfnt_xref *infop,
+			const struct libparsesfnt_tabdir_entry *tag)
+{
+	return PARSE(LIBPARSESFNT_XREF__, tag->offset, 0, 0, 0, 1, tag);
+}
+
+
+int
+libparsesfnt_parse_xref_entries(
+			const char *data, size_t size,
+			struct libparsesfnt_xref_entry *infop,
+			const struct libparsesfnt_tabdir_entry *tag,
+			size_t first, size_t count)
+{
+	return PARSE(LIBPARSESFNT_XREF_ENTRY__, tag->offset, 16, 0, first, count, tag);
+}
+
+
+int
+libparsesfnt_get_xref_offset(
+			size_t size,
+			size_t *offsetp,
+			const struct libparsesfnt_tabdir_entry *tag, const struct libparsesfnt_xref *xref,
+			const struct libparsesfnt_xref_entry *entry)
+{
+	size_t offset = (size_t)tag->offset;
+	if ((size_t)xref->string_offset > size - offset)
+		goto ebfont;
+	offset += (size_t)xref->string_offset;
+	if ((size_t)entry->string_offset > size - offset)
+		goto ebfont;
+	offset += (size_t)entry->string_offset;
+	if ((size_t)entry->string_length > size - offset)
+		goto ebfont;
+	*offsetp = offset;
+	return 0;
+
+ebfont:
+	errno = EBFONT;
+	return -1;
+}