PLearn 0.1
byte_order.h
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00001 // -*- C++ -*-
00002 
00003 // byte_order.h
00004 // Copyright (C) 1998-2002 Pascal Vincent
00005 //
00006 // Redistribution and use in source and binary forms, with or without
00007 // modification, are permitted provided that the following conditions are met:
00008 //
00009 //  1. Redistributions of source code must retain the above copyright
00010 //     notice, this list of conditions and the following disclaimer.
00011 //
00012 //  2. Redistributions in binary form must reproduce the above copyright
00013 //     notice, this list of conditions and the following disclaimer in the
00014 //     documentation and/or other materials provided with the distribution.
00015 //
00016 //  3. The name of the authors may not be used to endorse or promote
00017 //     products derived from this software without specific prior written
00018 //     permission.
00019 //
00020 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00021 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00022 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00023 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00024 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00025 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00026 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00027 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00028 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00029 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030 //
00031 // This file is part of the PLearn library. For more information on the PLearn
00032 // library, go to the PLearn Web site at www.plearn.org
00033 
00034 
00035 #ifndef byte_order_INC
00036 #define byte_order_INC
00037 
00038 // norman:
00039 // If I don't add a definition of the namespace std .NET it does not compile
00040 // (weird..)!
00041 #ifdef WIN32
00042 #include <string>
00043 #endif
00044 
00045 #include <stdlib.h>
00046 
00047 namespace PLearn {
00048 using namespace std;
00049 
00052 
00053 #define LITTLE_ENDIAN_ORDER 'L'
00054 #define BIG_ENDIAN_ORDER 'B'
00055 
00056 inline char byte_order()
00057 {
00058 #ifdef BIGENDIAN
00059     return BIG_ENDIAN_ORDER;
00060 #else
00061     return LITTLE_ENDIAN_ORDER;
00062 #endif
00063 }
00064 
00065 
00067 void endianswap2(void* ptr, int n);
00069 void endianswap4(void* ptr, int n);
00071 void endianswap8(void* ptr, int n);
00072 
00075 inline void endianswap(void* ptr, int nelems, int elemsize)
00076 {
00077     switch(elemsize)
00078     {
00079     case 1:
00080         break;
00081     case 2:
00082         endianswap2(ptr,nelems);
00083         break;
00084     case 4:
00085         endianswap4(ptr,nelems);
00086         break;
00087     case 8:
00088         endianswap8(ptr,nelems);
00089         break;
00090     default:
00091         abort();
00092     }
00093 }
00094 
00095 
00096 template<class T>
00097 inline void endianswap(T* ptr, int n=1)
00098 { endianswap(ptr,n,sizeof(T)); }
00099 
00100 }
00101 
00102 #endif
00103 
00104 
00105 /*
00106   Local Variables:
00107   mode:c++
00108   c-basic-offset:4
00109   c-file-style:"stroustrup"
00110   c-file-offsets:((innamespace . 0)(inline-open . 0))
00111   indent-tabs-mode:nil
00112   fill-column:79
00113   End:
00114 */
00115 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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