godot/core/io/marshalls.h

/*************************************************************************/
/*  marshalls.h                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef MARSHALLS_H
#define MARSHALLS_H

#include "typedefs.h"

#include "variant.h"

/**
  * Miscelaneous helpers for marshalling data types, and encoding
  * in an endian independent way
  */
  

union MarshallFloat {

	uint32_t i; ///< int
	float f; ///< float
};

union MarshallDouble {

	uint64_t l; ///< long long
	double d; ///< double
};

static inline unsigned int encode_uint16(uint16_t p_uint, uint8_t *p_arr) {

	for (int i=0;i<2;i++) {
	
		*p_arr=p_uint&0xFF;
		p_arr++; p_uint>>=8;
	}
	
	return sizeof( uint16_t );
}

static inline unsigned int encode_uint32(uint32_t p_uint, uint8_t *p_arr) {

	for (int i=0;i<4;i++) {
	
		*p_arr=p_uint&0xFF;
		p_arr++; p_uint>>=8;
	}
	
	return sizeof( uint32_t );
}

static inline unsigned int encode_float(float p_float, uint8_t *p_arr) {

	MarshallFloat mf;
	mf.f=p_float;
	encode_uint32( mf.i, p_arr );

	return sizeof( uint32_t );
}

static inline unsigned int encode_uint64(uint64_t p_uint, uint8_t *p_arr) {

	for (int i=0;i<8;i++) {
	
		*p_arr=p_uint&0xFF;
		p_arr++; p_uint>>=8;
	}
	
	return sizeof(uint64_t);
}

static inline unsigned int encode_double(double p_double, uint8_t *p_arr) {

	MarshallDouble md;
	md.d=p_double;
	encode_uint64( md.l, p_arr );

	return sizeof(uint64_t);
	
}


static inline int encode_cstring(const char *p_string, uint8_t * p_data) {

	int len=0;
	
	while (*p_string) {

		if (p_data) {
		
			*p_data=(uint8_t)*p_string;
			p_data++;
		}
		p_string++;
		len++;
	};
	
	if (p_data) *p_data = 0;
	return len+1;
}

static inline uint16_t decode_uint16(const uint8_t *p_arr) {

	uint16_t u=0;
	
	for (int i=0;i<2;i++) {
	
		uint16_t b = *p_arr;
		b<<=(i*8);
		u|=b;
		p_arr++;
	}
	
	return u;
}

static inline uint32_t decode_uint32(const uint8_t *p_arr) {

	uint32_t u=0;
	
	for (int i=0;i<4;i++) {
	
		uint32_t b = *p_arr;
		b<<=(i*8);
		u|=b;
		p_arr++;
	}
	
	return u;
}

static inline float decode_float(const uint8_t *p_arr) {
	
	MarshallFloat mf;
	mf.i = decode_uint32(p_arr);
	return mf.f;
}

static inline uint64_t decode_uint64(const uint8_t *p_arr) {

	uint64_t u=0;
	
	for (int i=0;i<8;i++) {
	
		uint64_t b = (*p_arr)&0xFF;
		b<<=(i*8);
		u|=b;
		p_arr++;
	}
	
	return u;
}

static inline double decode_double(const uint8_t *p_arr) {

	MarshallDouble md;
	md.l = decode_uint64( p_arr );
	return md.d;

}


Error decode_variant(Variant& r_variant,const uint8_t *p_buffer, int p_len,int *r_len=NULL);
Error encode_variant(const Variant& p_variant, uint8_t *r_buffer, int &r_len);

#endif