fat_types.h

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#ifndef __FAT_TYPES_H__
#define __FAT_TYPES_H__
 
// Detect 64-bit compilation on GCC
#if defined(__GNUC__) && defined(__SIZEOF_LONG__)
    #if __SIZEOF_LONG__ == 8
        #define FATFS_DEF_UINT32_AS_INT
    #endif
#endif
 
//-------------------------------------------------------------
// System specific types
//-------------------------------------------------------------
#ifndef FATFS_NO_DEF_TYPES
    typedef unsigned char uint8;
    typedef unsigned short uint16;
 
    // If compiling on a 64-bit machine, use int as 32-bits
    #ifdef FATFS_DEF_UINT32_AS_INT
        typedef unsigned int uint32;
    // Else for 32-bit machines & embedded systems, use long...
    #else
        typedef unsigned long uint32;
    #endif
#endif
 
#ifndef NULL
    #define NULL 0
#endif
 
//-------------------------------------------------------------
// Endian Macros
//-------------------------------------------------------------
// FAT is little endian so big endian systems need to swap words
 
// Little Endian - No swap required
#if FATFS_IS_LITTLE_ENDIAN == 1
 
    #define FAT_HTONS(n) (n)
    #define FAT_HTONL(n) (n)
 
// Big Endian - Swap required
#else
 
    #define FAT_HTONS(n) ((((uint16)((n) & 0xff)) << 8) | (((n) & 0xff00) >> 8))
    #define FAT_HTONL(n) (((((uint32)(n) & 0xFF)) << 24) | \
                    ((((uint32)(n) & 0xFF00)) << 8) | \
                    ((((uint32)(n) & 0xFF0000)) >> 8) | \
                    ((((uint32)(n) & 0xFF000000)) >> 24))
 
#endif
 
//-------------------------------------------------------------
// Structure Packing Compile Options
//-------------------------------------------------------------
#ifdef __GNUC__
    #define STRUCT_PACK
    #define STRUCT_PACK_BEGIN
    #define STRUCT_PACK_END
    #define STRUCT_PACKED           __attribute__ ((packed))
#else
    // Other compilers may require other methods of packing structures
    #define STRUCT_PACK
    #define STRUCT_PACK_BEGIN
    #define STRUCT_PACK_END
    #define STRUCT_PACKED
#endif
 
#endif