Added functions:

* Jupiter_prefix_length_to_bitmask(uint8_t)
* Jupiter_prefix_length_to_netmask(uint8_t)

Jupiter/Functions.c

@@ -1013,4 +1013,42 @@ double Jupiter_strtod_nospace_s(const char *str, size_t length)
 	}
 
 	return total;
-}
+}
+
+/** Prefix length to bitmask conversion tables */
+
+const uint32_t bitmask_table[] =
+{
+	0x00000000U, 0x80000000U, 0xC0000000U, 0xE0000000U,
+	0xF0000000U, 0xF8000000U, 0xFC000000U, 0xFE000000U,
+	0xFF000000U, 0xFF800000U, 0xFFC00000U, 0xFFE00000U,
+	0xFFF00000U, 0xFFF80000U, 0xFFFC0000U, 0xFFFE0000U,
+	0xFFFF0000U, 0xFFFF8000U, 0xFFFFC000U, 0xFFFFE000U,
+	0xFFFFF000U, 0xFFFFF800U, 0xFFFFFC00U, 0xFFFFFE00U,
+	0xFFFFFF00U, 0xFFFFFF80U, 0xFFFFFFC0U, 0xFFFFFFE0U,
+	0xFFFFFFF0U, 0xFFFFFFF8U, 0xFFFFFFFCU, 0xFFFFFFFEU,
+	0xFFFFFFFFU
+};
+
+const unsigned char *netmask_table[] =
+{
+	"\x00\x00\x00\x00", "\x80\x00\x00\x00", "\xC0\x00\x00\x00", "\xE0\x00\x00\x00",
+	"\xF0\x00\x00\x00", "\xF8\x00\x00\x00", "\xFC\x00\x00\x00", "\xFE\x00\x00\x00",
+	"\xFF\x00\x00\x00", "\xFF\x80\x00\x00", "\xFF\xC0\x00\x00", "\xFF\xE0\x00\x00",
+	"\xFF\xF0\x00\x00", "\xFF\xF8\x00\x00", "\xFF\xFC\x00\x00", "\xFF\xFE\x00\x00",
+	"\xFF\xFF\x00\x00", "\xFF\xFF\x80\x00", "\xFF\xFF\xC0\x00", "\xFF\xFF\xE0\x00",
+	"\xFF\xFF\xF0\x00", "\xFF\xFF\xF8\x00", "\xFF\xFF\xFC\x00", "\xFF\xFF\xFE\x00",
+	"\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\x80", "\xFF\xFF\xFF\xC0", "\xFF\xFF\xFF\xE0",
+	"\xFF\xFF\xFF\xF0", "\xFF\xFF\xFF\xF8", "\xFF\xFF\xFF\xFC", "\xFF\xFF\xFF\xFE",
+	"\xFF\xFF\xFF\xFF"
+};
+
+uint32_t Jupiter_prefix_length_to_bitmask(uint8_t prefix_length)
+{
+	return bitmask_table[prefix_length];
+}
+
+uint32_t Jupiter_prefix_length_to_netmask(uint8_t prefix_length)
+{
+	return *(uint32_t *)netmask_table[prefix_length];
+}

Jupiter/Functions.h

@@ -450,6 +450,24 @@ JUPITER_API unsigned long long Jupiter_strtoull_nospace_s(const char *str, size_
 */
 JUPITER_API double Jupiter_strtod_nospace_s(const char *str, size_t length);
 
+/**
+* @brief Converts an input prefix length into a bitmask
+* Note: Local byte order
+*
+* @param prefix_length Prefix length to convert
+* @return Bitmask represented by prefix_length
+*/
+JUPITER_API uint32_t Jupiter_prefix_length_to_bitmask(uint8_t prefix_length);
+
+/**
+* @brief Converts an input prefix length into a netmask
+* Note: Network byte order
+*
+* @param prefix_length Prefix length to convert
+* @return Netmask represented by prefix_length
+*/
+JUPITER_API uint32_t Jupiter_prefix_length_to_netmask(uint8_t prefix_length);
+
 #if defined __cplusplus
 }