1 files changed, 36 insertions, 0 deletions
diff --git a/libparsepcf_get_glyph_index.c b/libparsepcf_get_glyph_index.c
new file mode 100644
index 0000000..86150d6
--- /dev/null
+++ b/libparsepcf_get_glyph_index.c
@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsepcf_get_glyph_index(const char *file, size_t size,
+                            const struct libparsepcf_table *table,
+                            const struct libparsepcf_encoding *meta,
+                            const char *text, size_t *out)
+{
+	int msb = table->format & LIBPARSEPCF_BYTE;
+	size_t pos, i, j;
+
+	(void) size;
+
+	i = (size_t)*(const uint8_t *)text;
+	if (i < (size_t)meta->min_byte1 || i > (size_t)meta->max_byte1)
+		goto not_encoded;
+	i -= (size_t)meta->min_byte1;
+
+	if (meta->min_byte2 | meta->max_byte2) {
+		j = (size_t)*(const uint8_t *)text;
+		if (j < (size_t)meta->min_byte2 || j > (size_t)meta->max_byte2)
+			goto not_encoded;
+		j -= (size_t)meta->min_byte2;
+		i = i * (meta->max_byte2 - meta->min_byte2 + 1) + j;
+	}
+
+	pos = table->offset + 14 + i * 2;
+	*out = (size_t)PARSE_UINT16(&file[pos], msb);
+	return 0;
+
+not_encoded:
+	*out = (size_t)0xFFFF;
+	return 0;
+}