Added functions to translate integers to/from byte streams.

cpukit/include/rtems/endian.h

@@ -89,4 +89,136 @@ static inline uint16_t htons( uint16_t _x )
 #error "Unknown endian-ness for this cpu"
 #endif
 
+static inline uint16_t rtems_uint16_from_little_endian( const uint8_t *data)
+{
+  uint16_t value = 0;
+  ssize_t i = 0;
+
+  for (i = 1; i >= 0; --i) {
+    value = (uint16_t) ((value << 8) + data [i]);
+  }
+
+  return value;
+}
+
+static inline uint32_t rtems_uint32_from_little_endian( const uint8_t *data)
+{
+  uint32_t value = 0;
+  ssize_t i = 0;
+
+  for (i = 3; i >= 0; --i) {
+    value = (value << 8) + data [i];
+  }
+
+  return value;
+}
+
+static inline uint64_t rtems_uint64_from_little_endian( const uint8_t *data)
+{
+  uint64_t value = 0;
+  ssize_t i = 0;
+
+  for (i = 7; i >= 0; --i) {
+    value = (value << 8) + (uint64_t) data [i];
+  }
+
+  return value;
+}
+
+static inline uint16_t rtems_uint16_from_big_endian( const uint8_t *data)
+{
+  uint16_t value = 0;
+  size_t i = 0;
+
+  for (i = 0; i < 2; ++i) {
+    value = (uint16_t) ((value << 8) + data [i]);
+  }
+
+  return value;
+}
+
+static inline uint32_t rtems_uint32_from_big_endian( const uint8_t *data)
+{
+  uint32_t value = 0;
+  size_t i = 0;
+
+  for (i = 0; i < 4; ++i) {
+    value = (value << 8) + (uint32_t) data [i];
+  }
+
+  return value;
+}
+
+static inline uint64_t rtems_uint64_from_big_endian( const uint8_t *data)
+{
+  uint64_t value = 0;
+  size_t i = 0;
+
+  for (i = 0; i < 8; ++i) {
+    value = (value << 8) + (uint64_t) data [i];
+  }
+
+  return value;
+}
+
+static inline void rtems_uint16_to_little_endian( uint16_t value, uint8_t *data)
+{
+  size_t i = 0;
+
+  for (i = 0; i < 2; ++i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
+static inline void rtems_uint32_to_little_endian( uint32_t value, uint8_t *data)
+{
+  size_t i = 0;
+
+  for (i = 0; i < 4; ++i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
+static inline void rtems_uint64_to_little_endian( uint64_t value, uint8_t *data)
+{
+  size_t i = 0;
+
+  for (i = 0; i < 8; ++i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
+static inline void rtems_uint16_to_big_endian( uint16_t value, uint8_t *data)
+{
+  ssize_t i = 0;
+
+  for (i = 1; i >= 0; --i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
+static inline void rtems_uint32_to_big_endian( uint32_t value, uint8_t *data)
+{
+  ssize_t i = 0;
+
+  for (i = 3; i >= 0; --i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
+static inline void rtems_uint64_to_big_endian( uint64_t value, uint8_t *data)
+{
+  ssize_t i = 0;
+
+  for (i = 7; i >= 0; --i) {
+    data [i] = (uint8_t) value;
+    value >>= 8;
+  }
+}
+
 #endif /* _RTEMS_ENDIAN_H */