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- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
- */
-
- /* Functions for reading and writing endian-specific values */
-
- /* 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.
- */
-
- import SDL_types;
- import SDL_rwops;
- import SDL_byteorder;
-
- extern(C):
-
- /* 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.
- */
-
- Uint16 SDL_Swap16(Uint16 D) {
- return((D<<8)|(D>>8));
- }
-
- Uint32 SDL_Swap32(Uint32 D) {
- return((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
- }
-
- Uint64 SDL_Swap64(Uint64 val) {
- Uint32 hi, lo;
- /* Separate into high and low 32-bit values and swap them */
- lo = (Uint32)(val&0xFFFFFFFF);
- val >>= 32;
- hi = (Uint32)(val&0xFFFFFFFF);
- val = SDL_Swap32(lo);
- val <<= 32;
- val |= SDL_Swap32(hi);
- return(val);
- }
-
- /* Byteswap item from the specified endianness to the native endianness */
- //#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)
- Uint16 SDL_SwapLE16(Uint16 X) { return SDL_Swap16(X); }
- Uint32 SDL_SwapLE32(Uint32 X) { return SDL_Swap32(X); }
- Uint64 SDL_SwapLE64(Uint64 X) { return SDL_Swap64(X); }
- Uint16 SDL_SwapBE16(Uint16 X) { return (X); }
- Uint32 SDL_SwapBE32(Uint32 X) { return (X); }
- Uint64 SDL_SwapBE64(Uint64 X) { return (X); }
-
- /* Read an item of the specified endianness and return in native format */
- Uint16 SDL_ReadLE16(SDL_RWops *src);
- Uint16 SDL_ReadBE16(SDL_RWops *src);
- Uint32 SDL_ReadLE32(SDL_RWops *src);
- Uint32 SDL_ReadBE32(SDL_RWops *src);
- Uint64 SDL_ReadLE64(SDL_RWops *src);
- Uint64 SDL_ReadBE64(SDL_RWops *src);
-
- /* Write an item of native format to the specified endianness */
- int SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
- int SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
- int SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
- int SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
- int SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
- int SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
-