00001 00005 /* 00006 * Author: Steven Ludtke, 04/10/2003 (sludtke@bcm.edu) 00007 * Copyright (c) 2000-2006 Baylor College of Medicine 00008 * 00009 * This software is issued under a joint BSD/GNU license. You may use the 00010 * source code in this file under either license. However, note that the 00011 * complete EMAN2 and SPARX software packages have some GPL dependencies, 00012 * so you are responsible for compliance with the licenses of these packages 00013 * if you opt to use BSD licensing. The warranty disclaimer below holds 00014 * in either instance. 00015 * 00016 * This complete copyright notice must be included in any revised version of the 00017 * source code. Additional authorship citations may be added, but existing 00018 * author citations must be preserved. 00019 * 00020 * This program is free software; you can redistribute it and/or modify 00021 * it under the terms of the GNU General Public License as published by 00022 * the Free Software Foundation; either version 2 of the License, or 00023 * (at your option) any later version. 00024 * 00025 * This program is distributed in the hope that it will be useful, 00026 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00027 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00028 * GNU General Public License for more details. 00029 * 00030 * You should have received a copy of the GNU General Public License 00031 * along with this program; if not, write to the Free Software 00032 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00033 * 00034 * */ 00035 00036 #include "byteorder.h" 00037 #include "util.h" 00038 00039 using namespace EMAN; 00040 00041 bool ByteOrder::is_host_endian_checked = false; 00042 bool ByteOrder::host_big_endian = false; 00043 00044 bool ByteOrder::is_host_big_endian() 00045 { 00046 if (!is_host_endian_checked) { 00047 int one = 1; 00048 char *p_one = (char *) (&one); 00049 00050 if (p_one[0] == 1 && p_one[1] == 0 && p_one[2] == 0 && p_one[3] == 0) { 00051 host_big_endian = false; 00052 } 00053 else { 00054 host_big_endian = true; 00055 } 00056 00057 is_host_endian_checked = true; 00058 } 00059 00060 return host_big_endian; 00061 } 00062 00063 bool ByteOrder::is_float_big_endian(float f) 00064 { 00065 bool is_big = false; 00066 00067 if (Util::goodf(&f) && f > 0 && f < 65535.0 && f == floor(f)) { 00068 is_big = is_host_big_endian(); 00069 } 00070 else { 00071 is_big = !is_host_big_endian(); 00072 } 00073 00074 return is_big; 00075 }