Index: include/utils.h
===================================================================
--- include/utils.h	(revision 99e4d8fe41706a83d3ba384b8c90b6da90e220f0)
+++ include/utils.h	(revision ce57b1bc09a45e86accc62c7c251f8bb9a9e3ef1)
@@ -26,4 +26,5 @@
 void generate_crc32_table(void);
 unsigned long calculate_crc32(const char *buffer, int buffer_size);
+unsigned long calculate_crc32(const unsigned char *buffer, int buffer_size);