binfilter/inc/bf_sfx2/swap.hxx

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  30 #ifndef _SWAP_HXX
  31 #define _SWAP_HXX
  32
  33 #include <solar.h>
  34 namespace binfilter {
  35
  36 inline BOOL SwapShort()
  37 {
  38     short aLoHiTst = 0x55AA;
  39     return (*((char*)&aLoHiTst) == 0x55 );
  40 }
  41
  42 inline BOOL SwapLong()
  43 {
  44     long aLoHiTst = 0x5555AAAA;
  45     return (*((short*)&aLoHiTst) == 0x5555 );
  46 }
  47
  48 union LoHi
  49 {
  50     BYTE nBytes[2];
  51     short nShort;
  52 };
  53
  54 #define SWAP( n )   (( ((LoHi&)n).nBytes[1] << 8 ) + ((LoHi&)n).nBytes[0] )
  55
  56 inline short Swap(short nV)
  57 {
  58     return SwapShort()? SWAP(nV): nV;
  59 }
  60
  61 inline unsigned short Swap(unsigned short nV)
  62 {
  63     return SwapShort()? SWAP(nV): nV;
  64 }
  65
  66
  67 union LL
  68 {
  69     USHORT nBytes[2];
  70     long l;
  71 };
  72
  73 #define SWAPL(n)   (( ((LL&)n).nBytes[1] << 16 ) + ((LL&)n).nBytes[0] )
  74
  75 inline long SwapL(long l)
  76 {
  77     LL aL;
  78     aL.l = l;
  79     aL.nBytes[0] = SWAP(aL.nBytes[0]);
  80     aL.nBytes[1] = SWAP(aL.nBytes[1]);
  81     aL.l = SWAPL(aL.l);
  82     return aL.l;
  83 }
  84
  85 inline long Swap(long lV)
  86 {
  87     return SwapLong()? SwapL(lV): lV;
  88 }
  89
  90 inline unsigned long Swap(unsigned long lV)
  91 {
  92     return SwapLong()? SwapL(lV): lV;
  93 }
  94
  95 }//end of namespace binfilter
  96 #endif