Macro implementation Size-end conversion

Source: Internet
Author: User
Macro implementation Size-end conversion
/*  define multiline macros after each line with a ' \ '/
#define SW16 (x) \ (short) ((short)
        (x) & (short) 0x00ffu) << 8 | \< c5/> ((short) (x) & (short) 0xff00u) >> 8))

Suppose X=0xaabb
(short) (x) & (short) 0x00ffu) and 16-digit high 8-bit 0 0X00BB

Then <<8 to the left 8-bit lower 8-bit into a high 8-bit low 8-bit 0 results for 0XBB00

((short) (x) & (short) 0xff00u) >> 8)) The exact opposite result is 0X00AA

Two results again or one 0xbb00 | The 0X00AA is 0xbbaa.

macro implements size and spin network byte order

typedef unsigned short int uint16;
typedef unsigned long int uint32;

#define BIGLITTLESWAP16 (a)        (((UInt16) (a) & 0xff00) >> 8) | ((
                                                       uint16) (a) & 0X00FF) << 8) c4/> #define BIGLITTLESWAP32 (a)        ((UInt32) (a) & 0xff000000) >>) |
                                                       ((UINT32) (a) & 0x00ff0000 ) >> 8) | \ ((
                                                       UInt32) (a) & 0x0000ff00) << 8 | ((
                                                       uint32) (a) & 0x000000ff) << 24)

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