Add BIGENDIAN detection logic.

Author: shumow

lib/sha1.c

@@ -13,6 +13,24 @@
 #include"sha1.h"
 #include"ubc_check.h"
 
+
+/* 
+ Because Little-Endian architectures are most common,
+ we only set BIGENDIAN if one of these conditions is met.
+ Note that all MSFT platforms are little endian,
+ so none of these will be defined under the MSC compiler.
+ If you are compiling on a big endian platform and your compiler does not define one of these,
+ you will have to add whatever macros your tool chain defines to indicate Big-Endianness.
+ */
+#if (defined(__BYTE_ORDER) && (__BYTE_ORDER==__BIG_ENDIAN)) || \
+ (defined(__BYTE_ORDER__) && (__BYTE_ORDER__==__BIG_ENDIAN__)) || \
+ defined(__BIG_ENDIAN__) || defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \
+ defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__)
+
+#defineBIGENDIAN (1)
+
+#endif/*ENDIANNESS SELECTION*/
+
 #definerotate_right(x,n) (((x)>>(n))|((x)<<(32-(n))))
 #definerotate_left(x,n) (((x)<<(n))|((x)>>(32-(n))))