ref: d311c8e87038a48dc4162df0e2821c04dc0f6fa3
dir: /src/ENDIANAC.h/
/*
ENDIANAC.h
Copyright (C) 2006 Bernd Schmidt, Paul C. Pratt
You can redistribute this file and/or modify it under the terms
of version 2 of the GNU General Public License as published by
the Free Software Foundation. You should have received a copy
of the license along with this file; see the file COPYING.
This file 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
license for more details.
*/
/*
ENDIAN ACcess
Deals with endian issues in memory access.
This code is adapted from code in the Un*x Amiga Emulator by
Bernd Schmidt, as found in vMac by Philip Cummins.
*/
#ifdef ENDIANAC_H
#ifndef AllFiles
#error "header already included"
#endif
#else
#define ENDIANAC_H
#endif
#define do_get_mem_byte(a) ((ui3r)*((ui3b *)(a)))
#if BigEndianUnaligned
#define do_get_mem_word(a) ((ui4r)*((ui4b *)(a)))
#else
LOCALINLINEFUNC ui4r do_get_mem_word(ui3p a)
{
#if LittleEndianUnaligned
ui4b b = (*((ui4b *)(a)));
return ((b & 0x00FF) << 8) | ((b >> 8) & 0x00FF);
#else
return (((ui4r)*a) << 8) | ((ui4r)*(a + 1));
#endif
}
#endif
#if BigEndianUnaligned
#define do_get_mem_long(a) ((ui5r)*((ui5b *)(a)))
#elif HaveMySwapUi5r && LittleEndianUnaligned
#define do_get_mem_long(a) (MySwapUi5r((ui5r)*((ui5b *)(a))))
#else
LOCALINLINEFUNC ui5r do_get_mem_long(ui3p a)
{
#if LittleEndianUnaligned
#if 0
ui5b b = (*((ui5b *)(a)));
return ((b & 0x000000FF) << 24)
| ((b & 0x0000FF00) << 8)
| ((b & 0x00FF0000) >> 8)
| ((b & 0xFF000000) >> 24);
#endif
#if 0
ui5b b = (*((ui5b *)(a)));
return ((b << 24) & 0xFF000000)
| ((b << 8) & 0x00FF0000)
| ((b >> 8) & 0x0000FF00)
| ((b >> 24) & 0x000000FF);
/*
no, this doesn't do well with apple tools,
instead try combining two 16 bit swaps.
*/
#endif
ui5b b = (*((ui5b *)(a)));
ui4b b1 = b;
ui4b b2 = b >> 16;
ui4b c1 = ((b1 & 0x00FF) << 8) | ((b1 >> 8) & 0x00FF);
ui4b c2 = ((b2 & 0x00FF) << 8) | ((b2 >> 8) & 0x00FF);
return (((ui5r)c1) << 16) | ((ui5r)c2);
/*
better, though still doesn't use BSWAP
instruction with apple tools for intel.
*/
#else
return (((ui5r)*a) << 24) | (((ui5r)*(a + 1)) << 16)
| (((ui5r)*(a + 2)) << 8) | ((ui5r)*(a + 3));
#endif
}
#endif
#define do_put_mem_byte(a, v) ((*((ui3b *)(a))) = (v))
#if BigEndianUnaligned
#define do_put_mem_word(a, v) ((*((ui4b *)(a))) = (v))
#else
LOCALINLINEFUNC void do_put_mem_word(ui3p a, ui4r v)
{
#if LittleEndianUnaligned
ui4b b = ((v & 0x00FF) << 8) | ((v >> 8) & 0x00FF);
*(ui4b *)a = b;
#else
*a = v >> 8;
*(a + 1) = v;
#endif
}
#endif
#if BigEndianUnaligned
#define do_put_mem_long(a, v) ((*((ui5b *)(a))) = (v))
#elif HaveMySwapUi5r && LittleEndianUnaligned
#define do_put_mem_long(a, v) ((*((ui5b *)(a))) = MySwapUi5r(v))
#else
LOCALINLINEFUNC void do_put_mem_long(ui3p a, ui5r v)
{
#if LittleEndianUnaligned
ui4b b1 = v;
ui4b b2 = v >> 16;
ui4b c1 = ((b1 & 0x00FF) << 8) | ((b1 >> 8) & 0x00FF);
ui4b c2 = ((b2 & 0x00FF) << 8) | ((b2 >> 8) & 0x00FF);
*(ui5b *)a = (c1 << 16) | c2;
#else
*a = v >> 24;
*(a + 1) = v >> 16;
*(a + 2) = v >> 8;
*(a + 3) = v;
#endif
}
#endif