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(svn r11694) -Codechange: move more endianness related stuff to endian_func.hpp.

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This commit is contained in:
rubidium
2007-12-25 13:28:09 +00:00
parent 81bf9f8503
commit 851f19b341
11 changed files with 81 additions and 53 deletions
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30
src/core/bitmath_func.hpp
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@@ -291,4 +291,34 @@ template<typename T> static inline T ROR(const T x, const uint8 n)
for (i = 0; b != 0; i++, b >>= 1) \
if (b & 1)
#if defined(__APPLE__)
/* Make endian swapping use Apple's macros to increase speed
* (since it will use hardware swapping if available).
* Even though they should return uint16 and uint32, we get
* warnings if we don't cast those (why?) */
#define BSWAP32(x) ((uint32)Endian32_Swap(x))
#define BSWAP16(x) ((uint16)Endian16_Swap(x))
#else
/**
* Perform a 32 bits endianness bitswap on x.
* @param x the variable to bitswap
* @return the bitswapped value.
*/
static inline uint32 BSWAP32(uint32 x)
{
return ((x >> 24) & 0xFF) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000) | ((x << 24) & 0xFF000000);
}
/**
* Perform a 16 bits endianness bitswap on x.
* @param x the variable to bitswap
* @return the bitswapped value.
*/
static inline uint16 BSWAP16(uint16 x)
{
return (x >> 8) | (x << 8);
}
#endif /* __APPLE__ */
#endif /* BITMATH_FUNC_HPP */

45
src/core/endian_func.hpp
View File

@@ -5,6 +5,49 @@
#ifndef ENDIAN_FUNC_H
#define ENDIAN_FUNC_H
#include "bitmath_func.hpp"
#if defined(ARM) || defined(__arm__) || defined(__alpha__)
#define OTTD_ALIGNMENT
#endif
/* Windows has always LITTLE_ENDIAN */
#if defined(WIN32) || defined(__OS2__) || defined(WIN64)
#define TTD_LITTLE_ENDIAN
#elif !defined(TESTING)
/* Else include endian[target/host].h, which has the endian-type, autodetected by the Makefile */
#if defined(STRGEN)
#include "/endian_host.h"
#else
#include "endian_target.h"
#endif
#endif /* WIN32 || __OS2__ || WIN64 */
/* Setup alignment and conversion macros */
#if defined(TTD_BIG_ENDIAN)
#define TO_BE32X(x) (x)
#define FROM_BE32(x) (x)
#define TO_BE32(x) (x)
#define FROM_BE16(x) (x)
#define TO_BE16(x) (x)
#define TO_LE32X(x) BSWAP32(x)
static inline uint32 FROM_LE32(uint32 x) { return BSWAP32(x); }
static inline uint32 TO_LE32(uint32 x) { return BSWAP32(x); }
static inline uint16 FROM_LE16(uint16 x) { return BSWAP16(x); }
static inline uint16 TO_LE16(uint16 x) { return BSWAP16(x); }
#else
#define TO_BE32X(x) BSWAP32(x)
static inline uint32 FROM_BE32(uint32 x) { return BSWAP32(x); }
static inline uint32 TO_BE32(uint32 x) { return BSWAP32(x); }
static inline uint16 FROM_BE16(uint16 x) { return BSWAP16(x); }
static inline uint16 TO_BE16(uint16 x) { return BSWAP16(x); }
#define TO_LE32X(x) (x)
#define FROM_LE32(x) (x)
#define TO_LE32(x) (x)
#define FROM_LE16(x) (x)
#define TO_LE16(x) (x)
#endif /* TTD_BIG_ENDIAN */
static inline uint16 ReadLE16Aligned(const void *x)
{
return FROM_LE16(*(const uint16*)x);
@@ -19,4 +62,4 @@ static inline uint16 ReadLE16Unaligned(const void *x)
#endif
}
#endif /* ENDIAN_FUNC_H */
#endif /* ENDIAN_FUNC_HPP */