[C language utility] Convert hex string to string represented by its corresponding hex values

/* For Example
* Hex string:
* Unsigned char * src = "0a0b0c0d"
* Converted string:
* Unsigned char * des = {0x0a, 0x0b, 0x0c, 0x0d}
* Reference:
* Http://bdn.borland.com/article/0,1410,17203,00.html
*/

# Include "stdafx. H"
# Include <iostream. h>
# Include <string. h>

Int axtoi (char * hexstg ){
Int n = 0; // position in string
Int m = 0; // position in digit [] to shift
Int count; // loop index
Int intvalue = 0; // integer value of hex string
Int digit [5]; // hold values to convert
While (n <4 ){
If (hexstg [N] = '/0 ')
Break;
If (hexstg [N]> 0x29 & hexstg [N] <0x40) // If 0 to 9
Digit [N] = hexstg [N] & 0x0f; // convert to int
Else if (hexstg [N]> = 'A' & hexstg [N] <= 'F') // If A to F
Digit [N] = (hexstg [N] & 0x0f) + 9; // convert to int
Else if (hexstg [N]> = 'A' & hexstg [N] <= 'F') // If A to F
Digit [N] = (hexstg [N] & 0x0f) + 9; // convert to int
Else break;
N ++;
}
Count = N;
M = n-1;
N = 0;
While (n <count ){
// Digit [N] is value of hex digit at position n
// (M <2) is the number of positions to shift
// Or the bits into Return Value
Intvalue = intvalue | (digit [N] <(M <2 ));
M --; // adjust the position to set
N ++; // next digit to process
}
Return (intvalue );
}

Void convert (char * SRC, long src_len, char * des, long * des_len)

{

Char tempstr [4] = {0 };

* Des_len = src_len> 2;

For (INT I = 0; I <(* des_len); I ++)

{

Strncpy (tempstr, SRC + I * 2, 2 );

Des [I] = (char) axtoi (tempstr );

}

}

Int main (){

Char SRC [20] = "01020304aa ";
 
Char supposed_des [10] = {0x01,0x02,0x03,0x04, 0xaa };

Char des [10] = {0 };
Long des_len = 0;

Convert (SRC, 10, Des, & des_len );

If (0 = memcmp (DES, supposed_des, des_len ))
Cout <"successful! "<Endl;
Else
Cout <"failed! /N "<Endl;

Return 0;
}