1 files changed, 89 insertions, 0 deletions
diff --git a/include/rtems/rfs/rtems-rfs-data.h b/include/rtems/rfs/rtems-rfs-data.h
new file mode 100644
index 0000000000..6217e74587
--- /dev/null
+++ b/include/rtems/rfs/rtems-rfs-data.h
@@ -0,0 +1,89 @@
+/**
+ * @file
+ *
+ * @brief RTEMS File System Data
+ *
+ * @ingroup rtems_rfs
+ *
+ * RTEMS File System Data.
+ *
+ * Access data in the correct byte order for the specific target we are running
+ * on.
+ *
+ * @todo Make direct access on matching byte ordered targets.
+ */
+
+/*
+ *  COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+
+#if !defined (_RTEMS_RFS_DATA_H_)
+#define _RTEMS_RFS_DATA_H_
+
+#include <stdint.h>
+
+/**
+ * Helper function to make sure we have a byte pointer.
+ */
+#define rtems_rfs_data_ptr(_d) ((uint8_t*)(_d))
+
+/**
+ * Helper function to get the data shifted in the correctly sized type.
+ */
+#define rtems_rfs_data_get(_d, _t, _o, _s) \
+  (((_t)(rtems_rfs_data_ptr (_d)[_o])) << (_s))
+
+/**
+ * RFS Read Unsigned 8bit Integer
+ */
+#define rtems_rfs_read_u8(_d) \
+  (*rtems_rfs_data_ptr (_d))
+
+/**
+ * RFS Read Unsigned 16bit Integer
+ */
+#define rtems_rfs_read_u16(_d) \
+  (rtems_rfs_data_get (_d, uint16_t, 0, 8) | \
+   rtems_rfs_data_get (_d, uint16_t, 1, 0))
+
+/**
+ * RFS Read Unsigned 32bit Integer
+ */
+#define rtems_rfs_read_u32(_d) \
+  (rtems_rfs_data_get (_d, uint32_t, 0, 24) | \
+   rtems_rfs_data_get (_d, uint32_t, 1, 16) | \
+   rtems_rfs_data_get (_d, uint32_t, 2, 8) | \
+   rtems_rfs_data_get (_d, uint32_t, 3, 0))
+
+/**
+ * RFS Write Unsigned 8bit Integer
+ */
+#define rtems_rfs_write_u8(_d, _v) \
+  (*rtems_rfs_data_ptr (_d) = (uint8_t)(_v))
+
+/**
+ * RFS Write Unsigned 16bit Integer
+ */
+#define rtems_rfs_write_u16(_d, _v) \
+  do { \
+    rtems_rfs_data_ptr (_d)[0] = (uint8_t)(((uint16_t)(_v)) >> 8); \
+    rtems_rfs_data_ptr (_d)[1] = (uint8_t)((_v)); \
+  } while (0)
+
+/**
+ * RFS Write Unsigned 32bit Integer
+ */
+#define rtems_rfs_write_u32(_d, _v) \
+  do { \
+    rtems_rfs_data_ptr (_d)[0] = (uint8_t)(((uint32_t)(_v)) >> 24); \
+    rtems_rfs_data_ptr (_d)[1] = (uint8_t)(((uint32_t)(_v)) >> 16); \
+    rtems_rfs_data_ptr (_d)[2] = (uint8_t)(((uint32_t)(_v)) >> 8);  \
+    rtems_rfs_data_ptr (_d)[3] = (uint8_t)((uint32_t)(_v)); \
+  } while (0)
+
+#endif