mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-12-15 06:30:49 +00:00
213 lines
6.4 KiB
C
213 lines
6.4 KiB
C
|
/*
|
||
|
|
SDL - Simple DirectMedia Layer
|
||
|
|
Copyright (C) 1997-2004 Sam Lantinga
|
||
|
|
|
||
|
|
This library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Library General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
This library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with this library; if not, write to the Free
|
||
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
|
||
|
|
Sam Lantinga
|
||
|
|
slouken@libsdl.org
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef SAVE_RCSID
|
||
|
|
static char rcsid =
|
||
|
|
"@(#) $Id: SDL_endian.h,v 1.15 2005/03/30 12:38:03 pmandin Exp $";
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Functions for reading and writing endian-specific values */
|
||
|
|
|
||
|
|
#ifndef _SDL_endian_h
|
||
|
|
#define _SDL_endian_h
|
||
|
|
|
||
|
|
/* These functions read and write data of the specified endianness,
|
||
|
|
dynamically translating to the host machine endianness.
|
||
|
|
|
||
|
|
e.g.: If you want to read a 16 bit value on big-endian machine from
|
||
|
|
an open file containing little endian values, you would use:
|
||
|
|
value = SDL_ReadLE16(rp);
|
||
|
|
Note that the read/write functions use SDL_RWops pointers
|
||
|
|
instead of FILE pointers. This allows you to read and write
|
||
|
|
endian values from large chunks of memory as well as files
|
||
|
|
and other data sources.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#include "SDL_types.h"
|
||
|
|
#include "SDL_rwops.h"
|
||
|
|
#include "SDL_byteorder.h"
|
||
|
|
|
||
|
|
#include "begin_code.h"
|
||
|
|
/* Set up for C function definitions, even when using C++ */
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Use inline functions for compilers that support them, and static
|
||
|
|
functions for those that do not. Because these functions become
|
||
|
|
static for compilers that do not support inline functions, this
|
||
|
|
header should only be included in files that actually use them.
|
||
|
|
*/
|
||
|
|
#if defined(__GNUC__) && defined(__i386__)
|
||
|
|
static __inline__ Uint16 SDL_Swap16(Uint16 x)
|
||
|
|
{
|
||
|
|
__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && defined(__x86_64__)
|
||
|
|
static __inline__ Uint16 SDL_Swap16(Uint16 x)
|
||
|
|
{
|
||
|
|
__asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
|
||
|
|
static __inline__ Uint16 SDL_Swap16(Uint16 x)
|
||
|
|
{
|
||
|
|
Uint16 result;
|
||
|
|
|
||
|
|
__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
|
||
|
|
static __inline__ Uint16 SDL_Swap16(Uint16 x)
|
||
|
|
{
|
||
|
|
__asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static __inline__ Uint16 SDL_Swap16(Uint16 x) {
|
||
|
|
return((x<<8)|(x>>8));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(__GNUC__) && defined(__i386__)
|
||
|
|
static __inline__ Uint32 SDL_Swap32(Uint32 x)
|
||
|
|
{
|
||
|
|
__asm__("bswap %0" : "=r" (x) : "0" (x));
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && defined(__x86_64__)
|
||
|
|
static __inline__ Uint32 SDL_Swap32(Uint32 x)
|
||
|
|
{
|
||
|
|
__asm__("bswapl %0" : "=r" (x) : "0" (x));
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
|
||
|
|
static __inline__ Uint32 SDL_Swap32(Uint32 x)
|
||
|
|
{
|
||
|
|
Uint32 result;
|
||
|
|
|
||
|
|
__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
|
||
|
|
__asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
|
||
|
|
__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
|
||
|
|
static __inline__ Uint32 SDL_Swap32(Uint32 x)
|
||
|
|
{
|
||
|
|
__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static __inline__ Uint32 SDL_Swap32(Uint32 x) {
|
||
|
|
return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef SDL_HAS_64BIT_TYPE
|
||
|
|
#if defined(__GNUC__) && defined(__i386__)
|
||
|
|
static __inline__ Uint64 SDL_Swap64(Uint64 x)
|
||
|
|
{
|
||
|
|
union {
|
||
|
|
struct { Uint32 a,b; } s;
|
||
|
|
Uint64 u;
|
||
|
|
} v;
|
||
|
|
v.u = x;
|
||
|
|
__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
|
||
|
|
: "=r" (v.s.a), "=r" (v.s.b)
|
||
|
|
: "0" (v.s.a), "1" (v.s.b));
|
||
|
|
return v.u;
|
||
|
|
}
|
||
|
|
#elif defined(__GNUC__) && defined(__x86_64__)
|
||
|
|
static __inline__ Uint64 SDL_Swap64(Uint64 x)
|
||
|
|
{
|
||
|
|
__asm__("bswapq %0" : "=r" (x) : "0" (x));
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static __inline__ Uint64 SDL_Swap64(Uint64 x)
|
||
|
|
{
|
||
|
|
Uint32 hi, lo;
|
||
|
|
|
||
|
|
/* Separate into high and low 32-bit values and swap them */
|
||
|
|
lo = (Uint32)(x&0xFFFFFFFF);
|
||
|
|
x >>= 32;
|
||
|
|
hi = (Uint32)(x&0xFFFFFFFF);
|
||
|
|
x = SDL_Swap32(lo);
|
||
|
|
x <<= 32;
|
||
|
|
x |= SDL_Swap32(hi);
|
||
|
|
return(x);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#else
|
||
|
|
/* This is mainly to keep compilers from complaining in SDL code.
|
||
|
|
If there is no real 64-bit datatype, then compilers will complain about
|
||
|
|
the fake 64-bit datatype that SDL provides when it compiles user code.
|
||
|
|
*/
|
||
|
|
#define SDL_Swap64(X) (X)
|
||
|
|
#endif /* SDL_HAS_64BIT_TYPE */
|
||
|
|
|
||
|
|
|
||
|
|
/* Byteswap item from the specified endianness to the native endianness */
|
||
|
|
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
|
||
|
|
#define SDL_SwapLE16(X) (X)
|
||
|
|
#define SDL_SwapLE32(X) (X)
|
||
|
|
#define SDL_SwapLE64(X) (X)
|
||
|
|
#define SDL_SwapBE16(X) SDL_Swap16(X)
|
||
|
|
#define SDL_SwapBE32(X) SDL_Swap32(X)
|
||
|
|
#define SDL_SwapBE64(X) SDL_Swap64(X)
|
||
|
|
#else
|
||
|
|
#define SDL_SwapLE16(X) SDL_Swap16(X)
|
||
|
|
#define SDL_SwapLE32(X) SDL_Swap32(X)
|
||
|
|
#define SDL_SwapLE64(X) SDL_Swap64(X)
|
||
|
|
#define SDL_SwapBE16(X) (X)
|
||
|
|
#define SDL_SwapBE32(X) (X)
|
||
|
|
#define SDL_SwapBE64(X) (X)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Read an item of the specified endianness and return in native format */
|
||
|
|
extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src);
|
||
|
|
extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src);
|
||
|
|
extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src);
|
||
|
|
extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src);
|
||
|
|
extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src);
|
||
|
|
extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src);
|
||
|
|
|
||
|
|
/* Write an item of native format to the specified endianness */
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
|
||
|
|
extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
|
||
|
|
|
||
|
|
|
||
|
|
/* Ends C function definitions when using C++ */
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#include "close_code.h"
|
||
|
|
|
||
|
|
#endif /* _SDL_endian_h */
|