1 files changed, 58 insertions, 0 deletions
diff --git a/lib/libucsi/crc32.h b/lib/libucsi/crc32.h
new file mode 100644
index 0000000..7d781ce
--- /dev/null
+++ b/lib/libucsi/crc32.h
@@ -0,0 +1,58 @@
+/**
+ * crc32 calculation routines.
+ *
+ * Copyright (c) 2005 by Andrew de Quincey <adq_dvb@lidskialf.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef _UCSI_CRC32_H
+#define _UCSI_CRC32_H 1
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define CRC32_INIT (~0)
+
+extern uint32_t crc32tbl[];
+
+/**
+ * Calculate a CRC32 over a piece of data.
+ *
+ * @param crc Current CRC value (use CRC32_INIT for first call).
+ * @param buf Buffer to calculate over.
+ * @param len Number of bytes.
+ * @return Calculated CRC.
+ */
+static inline uint32_t crc32(uint32_t crc, uint8_t* buf, size_t len)
+{
+	size_t i;
+
+	for (i=0; i< len; i++) {
+		crc = (crc << 8) ^ crc32tbl[((crc >> 24) ^ buf[i]) & 0xff];
+	}
+
+	return crc;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif