ubifs-utils: Split common source files from mkfs.ubifs

Split common source files into common dir from mkfs.ubifs, this is a
preparation for importing libubifs(from linux kernel) to replace
current UBIFS libs.

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 27 insertions, 0 deletions

diff --git a/ubifs-utils/common/crc16.h b/ubifs-utils/common/crc16.h
new file mode 100644
index 0000000..539d21a
--- /dev/null
+++ b/ubifs-utils/common/crc16.h
@@ -0,0 +1,27 @@
+/*
+ * Implements the standard CRC-16:
+ *   Width 16
+ *   Poly  0x8005 (x^16 + x^15 + x^2 + 1)
+ *   Init  0
+ *
+ * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
+ *
+ * This code was taken from the linux kernel. The license is GPL Version 2.
+ */
+
+#ifndef __CRC16_H__
+#define __CRC16_H__
+
+#include <stdlib.h>
+#include <stdint.h>
+
+extern uint16_t const crc16_table[256];
+
+extern uint16_t crc16(uint16_t crc, const uint8_t *buffer, size_t len);
+
+static inline uint16_t crc16_byte(uint16_t crc, const uint8_t data)
+{
+	return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
+}
+
+#endif /* __CRC16_H__ */