What is the meaning of the following pseudo-code?:

  1. BYTE1(v2) or BYTE1(v2)

  2. HIBYTE(v2)

Is there any explanation for those macros? How can I implement those macros in C code?


BYTE1(v2) is the second byte of value v2. according to the reference it's Zero-Indexed. defined as:

#define BYTEn(x, n)   (*((_BYTE*)&(x)+n))
#define BYTE1(x)   BYTEn(x,  1)         // byte 1 (counting from 0)

for example BYTE1(0x1213141516) is 0x15. (according to Little Endian Byte Order)

HIBYTE(v2) is the higher byte of value v2. defined as:

#define HIBYTE(x)   (*((_BYTE*)&(x)+1))

for example HIBYTE(0x1213) is 0x12. (according to Little Endian Byte Order)

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Open your IDA installation folder open plugins\defs.h, this file contains all of the macros used by the hexrays decompiler. It can also be found at the github in arman's answer.

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