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byteswap.c File Reference

#include "nt.h"
#include "ntrtlp.h"

Go to the source code of this file.

Functions

USHORT FASTCALL RtlUshortByteSwap (IN USHORT Source)
ULONG FASTCALL RtlUlongByteSwap (IN ULONG Source)
ULONGLONG FASTCALL RtlUlonglongByteSwap (IN ULONGLONG Source)

Function Documentation

ULONG FASTCALL RtlUlongByteSwap (  IN ULONG  Source  ) 
 

Definition at line 60 of file byteswap.c. 

00066                    :
00067 
00068     The RtlUlongByteSwap function exchanges byte pairs 0:3 and 1:2 of
00069     Source and returns the resulting ULONG.
00070 
00071 Arguments:
00072 
00073     Source - 32-bit value to byteswap.
00074 
00075 Return Value:
00076 
00077     Swapped 32-bit value.
00078 
00079 --*/
00080 {
00081     ULONG swapped;
00082 
00083     swapped = ((Source)              << (8 * 3)) |
00084               ((Source & 0x0000FF00) << (8 * 1)) |
00085               ((Source & 0x00FF0000) >> (8 * 1)) |
00086               ((Source)              >> (8 * 3));
00087 
00088     return swapped;
00089 }

ULONGLONG FASTCALL RtlUlonglongByteSwap (  IN ULONGLONG  Source  ) 
 

Definition at line 94 of file byteswap.c. 

00100                    :
00101 
00102     The RtlUlongByteSwap function exchanges byte pairs 0:7, 1:6, 2:5, and
00103     3:4 of Source and returns the resulting ULONGLONG.
00104 
00105 Arguments:
00106 
00107     Source - 64-bit value to byteswap.
00108 
00109 Return Value:
00110 
00111     Swapped 64-bit value.
00112 
00113 --*/
00114 {
00115     ULONGLONG swapped;
00116 
00117     swapped = ((Source)                      << (8 * 7)) |
00118               ((Source & 0x000000000000FF00) << (8 * 5)) |
00119               ((Source & 0x0000000000FF0000) << (8 * 3)) |
00120               ((Source & 0x00000000FF000000) << (8 * 1)) |
00121               ((Source & 0x000000FF00000000) >> (8 * 1)) |
00122               ((Source & 0x0000FF0000000000) >> (8 * 3)) |
00123               ((Source & 0x00FF000000000000) >> (8 * 5)) |
00124               ((Source)                      >> (8 * 7));
00125 
00126     return swapped;
00127 }

USHORT FASTCALL RtlUshortByteSwap (  IN USHORT  Source  ) 
 

Definition at line 28 of file byteswap.c.

References USHORT. 

00034                    :
00035 
00036     The RtlUshortByteSwap function exchanges bytes 0 and 1 of Source
00037     and returns the resulting USHORT.
00038 
00039 Arguments:
00040 
00041     Source - 16-bit value to byteswap.
00042 
00043 Return Value:
00044 
00045     Swapped 16-bit value.
00046 
00047 --*/
00048 {
00049     USHORT swapped;
00050 
00051     swapped = ((Source) << (8 * 1)) |
00052               ((Source) >> (8 * 1));
00053 
00054     return swapped;
00055 }

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