endian.h

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00001 /*
00002  * This file is part of LibParserUtils.
00003  * Licensed under the MIT License,
00004  *                http://www.opensource.org/licenses/mit-license.php
00005  * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
00006  */
00007 
00008 #ifndef parserutils_endian_h_
00009 #define parserutils_endian_h_
00010 
00011 static inline bool endian_host_is_le(void)
00012 {
00013         static uint32_t magic = 0x10000002;
00014 
00015         return (((uint8_t *) &magic)[0] == 0x02);
00016 }
00017 
00018 static inline uint32_t endian_swap(uint32_t val)
00019 {
00020         return ((val & 0xff000000) >> 24) | ((val & 0x00ff0000) >> 8) |
00021                 ((val & 0x0000ff00) << 8) | ((val & 0x000000ff) << 24);
00022 }
00023 
00024 static inline uint32_t endian_host_to_big(uint32_t host)
00025 {
00026         if (endian_host_is_le())
00027                 return endian_swap(host);
00028 
00029         return host;
00030 }
00031 
00032 static inline uint32_t endian_big_to_host(uint32_t big)
00033 {
00034         if (endian_host_is_le())
00035                 return endian_swap(big);
00036 
00037         return big;
00038 }
00039 
00040 #endif