Serialization Helper

serial.h

/*
 * serial.h - Serialization helper
 *
 *             DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *                    Version 2, December 2004
 *
 * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 *            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 *  0. You just DO WHAT THE FUCK YOU WANT TO.
 *
 *  Why memcpy ? http://stackoverflow.com/a/32095106
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <string.h>

uint16_t inline BsWord(uint16_t x){
	return ((x & 0x00FF) << 8) |
	       ((x & 0xFF00) >> 8);
}

uint32_t inline BsDword(uint32_t x){
	return ((x & 0x000000FF) << 24) |
	       ((x & 0x0000FF00) <<  8) |
	       ((x & 0x00FF0000) >>  8) |
	       ((x & 0xFF000000) >> 24);
}

#define BsData(i) ({		\
	_Generic((i),		\
	uint16_t: BsWord(i),	\
	uint32_t: BsDword(i),	\
	default: (i));		\
})

#define ToData(o, i) ({			\
	memcpy(&o, i, sizeof(i));	\
})

#define FrData(o, i) ({			\
	memcpy(o, &i, sizeof(i));	\
})

#define RdData(o, i) ({	\
	ToData(o, i);	\
	i += sizeof(o);	\
})

#define WrData(o, i) ({	\
	FrData(o, i);	\
	o += sizeof(i);	\
})

#define RsData(o, i) ({	\
	RdData(o, i);	\
	o = BsData(o);	\
})

#define WsData(o, i) ({	\
	i = BsData(i);	\
	WrData(o, i);	\
})

#ifdef __cplusplus
}
#endif

TODO.

• Force gcc to push large input (>5 bytes) with 4, 2 and 1 bytes primitives.
• Use internal temporary variable to allow non pointers input or output.
• Add documentation (doxygen).