1 files changed, 50 insertions, 0 deletions
diff --git a/libparsepcf_get_metrics.c b/libparsepcf_get_metrics.c
new file mode 100644
index 0000000..5e2fbe0
--- /dev/null
+++ b/libparsepcf_get_metrics.c
@@ -0,0 +1,50 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsepcf_get_metrics(const char *file, size_t size,
+                        const struct libparsepcf_table *table,
+                        struct libparsepcf_metrics *out, size_t first, size_t count)
+{
+	size_t pos, i;
+	int msb = table->format & LIBPARSEPCF_BYTE;
+	int compressed = table->format & LIBPARSEPCF_COMPRESSED_METRICS;
+
+	(void) size;
+
+	pos = table->offset + (compressed ? 6 : 8);
+	pos += first * (compressed ? 5 : 12);
+
+	if (compressed) {
+		for (i = 0; i < count; i++, pos += 5) {
+			out[i].left_side_bearing  = (int16_t)((int)((const uint8_t *)file)[pos + 0] - 128);
+			out[i].right_side_bearing = (int16_t)((int)((const uint8_t *)file)[pos + 1] - 128);
+			out[i].character_width    = (int16_t)((int)((const uint8_t *)file)[pos + 2] - 128);
+			out[i].character_ascent   = (int16_t)((int)((const uint8_t *)file)[pos + 3] - 128);
+			out[i].character_descent  = (int16_t)((int)((const uint8_t *)file)[pos + 4] - 128);
+			out[i].character_attributes = 0;
+			if (out[i].left_side_bearing > out[i].right_side_bearing ||
+			    (int32_t)out[i].character_ascent < -(int32_t)out[i].character_descent)
+				goto ebfont;
+		}
+	} else {
+		for (i = 0; i < count; i++, pos += 12) {
+			out[i].left_side_bearing    = PARSE_INT16(&file[pos + 0], msb);
+			out[i].right_side_bearing   = PARSE_INT16(&file[pos + 2], msb);
+			out[i].character_width      = PARSE_INT16(&file[pos + 4], msb);
+			out[i].character_ascent     = PARSE_INT16(&file[pos + 6], msb);
+			out[i].character_descent    = PARSE_INT16(&file[pos + 8], msb);
+			out[i].character_attributes = PARSE_UINT16(&file[pos + 10], msb);
+			if (out[i].left_side_bearing > out[i].right_side_bearing ||
+			    (int32_t)out[i].character_ascent < -(int32_t)out[i].character_descent)
+				goto ebfont;
+		}
+	}
+
+	return 0;
+
+ebfont:
+	errno = EBFONT;
+	return -1;
+}