// "License": Public Domain
// I, Mathias Panzenböck, place this file hereby into the public domain. Use it at your own risk for whatever you like.
// In case there are jurisdictions that don't support putting things in the public domain you can also consider it to
// be "dual licensed" under the BSD, MIT and Apache licenses, if you want to. This code is trivial anyway. Consider it
// an example on how to get the endian conversion functions on different platforms.

// Modified by roberto@zenvoid.org for Slade Doom Editor, all changes under the same license as the original.

#ifndef PORTABLE_ENDIAN_H__
#define PORTABLE_ENDIAN_H__

#include <stdint.h>

#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)

#	define __WINDOWS__

#endif

#if defined(__linux__) || defined(__CYGWIN__)

#	ifndef _BSD_SOURCE
#		define _BSD_SOURCE
#	endif
#	include <endian.h>

#elif defined(__APPLE__)

#	include <libkern/OSByteOrder.h>

#	define htobe16(x) OSSwapHostToBigInt16(x)
#	define htole16(x) OSSwapHostToLittleInt16(x)
#	define be16toh(x) OSSwapBigToHostInt16(x)
#	define le16toh(x) OSSwapLittleToHostInt16(x)

#	define htobe32(x) OSSwapHostToBigInt32(x)
#	define htole32(x) OSSwapHostToLittleInt32(x)
#	define be32toh(x) OSSwapBigToHostInt32(x)
#	define le32toh(x) OSSwapLittleToHostInt32(x)

#	define htobe64(x) OSSwapHostToBigInt64(x)
#	define htole64(x) OSSwapHostToLittleInt64(x)
#	define be64toh(x) OSSwapBigToHostInt64(x)
#	define le64toh(x) OSSwapLittleToHostInt64(x)

#	define __BYTE_ORDER    BYTE_ORDER
#	define __BIG_ENDIAN    BIG_ENDIAN
#	define __LITTLE_ENDIAN LITTLE_ENDIAN
#	define __PDP_ENDIAN    PDP_ENDIAN

#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)

#	include <sys/endian.h>

#elif defined(__DragonFly__)

#	include <sys/endian.h>

#	define be16toh(x) betoh16(x)
#	define le16toh(x) letoh16(x)

#	define be32toh(x) betoh32(x)
#	define le32toh(x) letoh32(x)

#	define be64toh(x) betoh64(x)
#	define le64toh(x) letoh64(x)

#elif defined(__WINDOWS__)

//#	include <winsock2.h>
//#	include <sys/param.h>

#	if BYTE_ORDER == LITTLE_ENDIAN

#		define htobe16(x) htons(x)
#		define htole16(x) (x)
#		define be16toh(x) ntohs(x)
#		define le16toh(x) (x)

#		define htobe32(x) htonl(x)
#		define htole32(x) (x)
#		define be32toh(x) ntohl(x)
#		define le32toh(x) (x)

#		define htobe64(x) htonll(x)
#		define htole64(x) (x)
#		define be64toh(x) ntohll(x)
#		define le64toh(x) (x)

#	elif BYTE_ORDER == BIG_ENDIAN

		/* that would be xbox 360 */
#		define htobe16(x) (x)
#		define htole16(x) __builtin_bswap16(x)
#		define be16toh(x) (x)
#		define le16toh(x) __builtin_bswap16(x)

#		define htobe32(x) (x)
#		define htole32(x) __builtin_bswap32(x)
#		define be32toh(x) (x)
#		define le32toh(x) __builtin_bswap32(x)

#		define htobe64(x) (x)
#		define htole64(x) __builtin_bswap64(x)
#		define be64toh(x) (x)
#		define le64toh(x) __builtin_bswap64(x)

#	else

#		error byte order not supported

#	endif

#	define __BYTE_ORDER    BYTE_ORDER
#	define __BIG_ENDIAN    BIG_ENDIAN
#	define __LITTLE_ENDIAN LITTLE_ENDIAN
#	define __PDP_ENDIAN    PDP_ENDIAN

#else

#	error platform not supported

#endif

/* build 32 bit unsigned integer from 4 char */

#define MAKE_ID(a,b,c,d) be32toh(((uint32_t)(d))|((c)<<8)|((b)<<16)|((a)<<24))

/* macros which receive a pointer to a memory buffer */

#define BE_16U_TO_H(m) \
	((uint16_t)(((uint8_t*)(m))[1])|(uint16_t)(((uint8_t*)(m))[0]<<8))
#define BE_32U_TO_H(m) \
	((uint32_t)(((uint8_t*)(m))[3])|(uint32_t)(((uint8_t*)(m))[2]<<8)|(uint32_t)(((uint8_t*)(m))[1]<<16)|(uint32_t)(((uint8_t*)(m))[0]<<24))
#define LE_16U_TO_H(m) \
	((uint16_t)(((uint8_t*)(m))[0])|(uint16_t)(((uint8_t*)(m))[1]<<8))
#define LE_32U_TO_H(m) \
	((uint32_t)(((uint8_t*)(m))[0])|(uint32_t)(((uint8_t*)(m))[1]<<8)|(uint32_t)(((uint8_t*)(m))[2]<<16)|(uint32_t)(((uint8_t*)(m))[3]<<24))

#define BE_16I_TO_H(m) (int16_t)BE_16U_TO_H(m)
#define BE_32I_TO_H(m) (int32_t)BE_32U_TO_H(m)
#define LE_16I_TO_H(m) (int16_t)LE_16U_TO_H(m)
#define LE_32I_TO_H(m) (int32_t)LE_32U_TO_H(m)

#endif
