Resolve "Kara length"

Closes #58 (closed)

inc/common/common.h

@@ -4,6 +4,11 @@
 #include <unistd.h>
 #include <stdint.h>
 
+/* May be usefull (gcc, see something else for clang):
+   __FLOAT_WORD_ORDER__
+   __ORDER_LITTLE_ENDIAN__
+   __ORDER_BIG_ENDIAN__ */
+
 #define not_implemented() __not_implemented(__func__,__FILE__,__LINE__)
 extern void __not_implemented(const char *func, char *file, int line);
 
@@ -27,6 +32,10 @@ uint32_t be_uint32_t(const uint8_t bytes[], size_t n);
    Restriction: n <= 8 */
 uint64_t be_uint64_t(const uint8_t bytes[], size_t n);
 
+/* Same as `be_uint64_t` but for Big-endian doubles.
+   Restriction: n <= 8 */
+double be_double_t(const uint8_t bytes[], size_t n);
+
 /* Trim the string `str` of the char `c` from the right and the left.
    The string may not be null terminated.
    Returns a pointer to the the trimmed string