1 /* Copyright 2007-2012 Fredrik Wikstrom. All rights reserved.
3 ** Redistribution and use in source and binary forms, with or without
4 ** modification, are permitted provided that the following conditions
7 ** 1. Redistributions of source code must retain the above copyright
8 ** notice, this list of conditions and the following disclaimer.
10 ** 2. Redistributions in binary form must reproduce the above copyright
11 ** notice, this list of conditions and the following disclaimer in the
12 ** documentation and/or other materials provided with the distribution.
14 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
15 ** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 ** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18 ** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 ** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 ** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 ** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 ** POSSIBILITY OF SUCH DAMAGE.
30 void swab2 (CONST_APTR source
, APTR dest
, ULONG bytes
) {
31 ULONG longs
= (bytes
>> 1) >> 2;
32 ULONG words
= (bytes
>> 1) & 3;
37 const ULONG m1
= 0xff00ff00;
38 const ULONG m2
= 0x00ff00ff;
39 l_src
= (const ULONG
*)source
;
40 l_dst
= (ULONG
*)dest
;
42 *l_dst
++ = ((*l_src
<< 8) & m1
)|((*l_src
>> 8) & m2
);
44 *l_dst
++ = ((*l_src
<< 8) & m1
)|((*l_src
>> 8) & m2
);
48 w_src
= (const UWORD
*)l_src
;
49 w_dst
= (UWORD
*)l_dst
;
52 wswap16(w_dst
++, *w_src
); w_src
++;
54 wswap16(w_dst
++, *w_src
); w_src
++;
56 wswap16(w_dst
++, *w_src
); w_src
++;