diff options
Diffstat (limited to 'cpukit/libfs/src/rfs/rtems-rfs-data.h')
-rw-r--r-- | cpukit/libfs/src/rfs/rtems-rfs-data.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/cpukit/libfs/src/rfs/rtems-rfs-data.h b/cpukit/libfs/src/rfs/rtems-rfs-data.h new file mode 100644 index 0000000000..67e820faac --- /dev/null +++ b/cpukit/libfs/src/rfs/rtems-rfs-data.h @@ -0,0 +1,78 @@ +/* + * 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.com/license/LICENSE. + * + * $Id$ + */ +/** + * @file + * + * @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. + */ + +#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)) + +/** + * 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_ptr (_d)[0] << 8) | (rtems_rfs_data_ptr (_d)[1])) + +/** + * RFS Read Unsigned 32bit Integer + */ +#define rtems_rfs_read_u32(_d) \ + ((rtems_rfs_data_ptr (_d)[0] << 24) | (rtems_rfs_data_ptr (_d)[1] << 16) | \ + (rtems_rfs_data_ptr (_d)[2] << 8) | (rtems_rfs_data_ptr (_d)[3])) + +/** + * 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)((_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)((_v) >> 24); \ + rtems_rfs_data_ptr (_d)[1] = (uint8_t)((_v) >> 16); \ + rtems_rfs_data_ptr (_d)[2] = (uint8_t)((_v) >> 8); \ + rtems_rfs_data_ptr (_d)[3] = (uint8_t)((_v)); \ + } while (0) + +#endif |