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Split up endianness functions into separate header file

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This commit is contained in:
twinaphex 2014-09-28 23:21:27 +02:00
parent 449cb9e9ed
commit 2523337416
2 changed files with 65 additions and 42 deletions
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64
endianness.h Normal file
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@ -0,0 +1,64 @@
/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2014 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ENDIANNESS_H
#define __ENDIANNESS_H
#include <stdint.h>
static inline uint8_t is_little_endian(void)
{
union
{
uint16_t x;
uint8_t y[2];
} u;
u.x = 1;
return u.y[0];
}
static inline uint32_t swap_if_big32(uint32_t val)
{
if (is_little_endian())
return val;
return (val >> 24) | ((val >> 8) & 0xFF00) |
((val << 8) & 0xFF0000) | (val << 24);
}
static inline uint32_t swap_if_little32(uint32_t val)
{
if (is_little_endian())
return (val >> 24) | ((val >> 8) & 0xFF00) |
((val << 8) & 0xFF0000) | (val << 24);
return val;
}
static inline uint16_t swap_if_big16(uint16_t val)
{
if (is_little_endian())
return val;
return (val >> 8) | (val << 8);
}
static inline uint16_t swap_if_little16(uint16_t val)
{
if (is_little_endian())
return (val >> 8) | (val << 8);
return val;
}
#endif

43
miscellaneous.h
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@ -38,6 +38,7 @@
#include "msvc/msvc_compat.h"
#include "retroarch_logger.h"
#include "endianness.h"
#include <limits.h>
/* Some platforms do not set this value.
@ -107,48 +108,6 @@ static inline uint32_t prev_pow2(uint32_t v)
return v - (v >> 1);
}
static inline uint8_t is_little_endian(void)
{
union
{
uint16_t x;
uint8_t y[2];
} u;
u.x = 1;
return u.y[0];
}
static inline uint32_t swap_if_big32(uint32_t val)
{
if (is_little_endian())
return val;
return (val >> 24) | ((val >> 8) & 0xFF00) |
((val << 8) & 0xFF0000) | (val << 24);
}
static inline uint32_t swap_if_little32(uint32_t val)
{
if (is_little_endian())
return (val >> 24) | ((val >> 8) & 0xFF00) |
((val << 8) & 0xFF0000) | (val << 24);
return val;
}
static inline uint16_t swap_if_big16(uint16_t val)
{
if (is_little_endian())
return val;
return (val >> 8) | (val << 8);
}
static inline uint16_t swap_if_little16(uint16_t val)
{
if (is_little_endian())
return (val >> 8) | (val << 8);
return val;
}
/* Helper macros and struct to keep track of many booleans.
* To check for multiple bits, use &&, not &.
* For OR, | can be used. */