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https://github.com/kichikuou/xsystem35-sdl2.git
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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* LittleEndian.c get little endian value
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*
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* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
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* 1998- <masaki-c@is.aist-nara.ac.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* @version 0.00 97/11/06 初版
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*/
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/* $Id: LittleEndian.c,v 1.5 2000/11/25 13:08:56 chikama Exp $ */
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#include "portab.h"
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int LittleEndian_getDW(const BYTE *b,int index) {
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int c0, c1, c2, c3;
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int d0, d1;
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c0 = *(b + index + 0);
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c1 = *(b + index + 1);
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c2 = *(b + index + 2);
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c3 = *(b + index + 3);
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d0 = c0 + (c1 << 8);
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d1 = c2 + (c3 << 8);
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return (DWORD)(d0 + (d1 << 16));
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}
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int LittleEndian_get3B(const BYTE *b,int index) {
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int c0, c1, c2;
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c0 = *(b + index + 0);
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c1 = *(b + index + 1);
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c2 = *(b + index + 2);
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return c0 + (c1 << 8) + (c2 << 16);
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}
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int LittleEndian_getW(const BYTE *b,int index) {
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int c0, c1;
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c0 = *(b + index + 0);
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c1 = *(b + index + 1);
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return c0 + (c1 << 8);
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}
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void LittleEndian_putW(int num, BYTE *b, int index) {
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int c0, c1;
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num %= 65536;
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c0 = num % 256;
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c1 = num / 256;
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b[index] = c0; b[index+1] = c1;
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}
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