endianness.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __ENDIANNESS_H__
#define __ENDIANNESS_H__

#include "rofl_config.h"
#include <stdint.h>

/*
* Add a macro implementation for htonb and ntohb
*/

#if defined(BIG_ENDIAN_DETECTED)
        //Host -> Network
        #define HTONB16(x) x 
        #define HTONB32(x) x
        #define HTONB64(x) x

        //Network -> Host
        #define NTOHB16(x) x 
        #define NTOHB32(x) x
        #define NTOHB64(x) x

        //
        // Conditional byte swappers. Convienience wrapper
        //
        #define COND_NTOHB16(nbo, x) x 
        #define COND_NTOHB32(nbo, x) x
        #define COND_NTOHB64(nbo, x) x
#elif defined(LITTLE_ENDIAN_DETECTED)
        #if defined(BYTESWAP_HEADER_DETECTED)
                #include <byteswap.h>
                
                //Host -> Network
                #define HTONB16(x) __bswap_16(x)  
                #define HTONB32(x) __bswap_32(x) 
                #define HTONB64(x) __bswap_64(x) 
        
                //Network -> Host
                #define NTOHB16(x) __bswap_16(x)
                #define NTOHB32(x) __bswap_32(x)
                #define NTOHB64(x) __bswap_64(x)
        #else
                //Host -> Network
                #define HTONB16(x) ( (((x) >> 8) & 0x00FF) | (((x) << 8) & 0xFF00) )
                #define HTONB32(x) \
                        ( (((x) >> 24) & 0x000000FF) | (((x) >>  8) & 0x0000FF00) | \
                        (((x) <<  8) & 0x00FF0000) | (((x) << 24) & 0xFF000000) )

                 
                #define HTONB64(x) \
                        ( (((x) >> 56) & 0x00000000000000FF) | (((x) >> 40) & 0x000000000000FF00) | \
                        (((x) >> 24) & 0x0000000000FF0000) | (((x) >>  8) & 0x00000000FF000000) | \
                        (((x) <<  8) & 0x000000FF00000000) | (((x) << 24) & 0x0000FF0000000000) | \
                        (((x) << 40) & 0x00FF000000000000) | (((x) << 56) & 0xFF00000000000000) )
                
                //Network -> Host
                #define NTOHB16(x) HTONB16(x)
                #define NTOHB32(x) HTONB32(x)
                #define NTOHB64(x) HTONB64(x)
        
        #endif

        //
        // Conditional byte swappers. Convienience wrapper
        //
        #define COND_NTOHB16(nbo, x) ( (nbo)? x : NTOHB16(x) )
        #define COND_NTOHB32(nbo, x) ( (nbo)? x : NTOHB32(x) )
        #define COND_NTOHB64(nbo, x) ( (nbo)? x : NTOHB64(x) )
#else
        #error Unsupported endianness
#endif //endianness check

#endif //__ENDIANNESS_H__