SoloCodigo

Hace uso de una tabla con los 256 bytes a modo de strings, dicha tabla se usa como referencia en dos funciones las cuales son las que hacen la conversión tal como el título dice, y a la inversa también.
Se que no es la única ni la mejor forma de hacerlo, pero como puede apreciarse no se requere saber nada acerca de manejo de bytes para usar este código. Creo que esa es la ventaja.

Atte

/********************************************************************************************************

// By 85
// boyscout_arg@hotmail.com
// etalking.com.ar
// David Riedel
// 2013

*********************************************************************************************************/

#include <windows.h>
#include <stdlib.h>
#include <stdio.h>

/////
/////////////////////////////////////

char* hextabla[] = { //256 BYTES
"00","01","02","03","04","05","06","07","08","09",
"0A","0B","0C","0D","0E","0F","10","11","12","13",
"14","15","16","17","18","19","1A","1B","1C","1D",
"1E","1F","20","21","22","23","24","25","26","27",
"28","29","2A","2B","2C","2D","2E","2F","30","31",
"32","33","34","35","36","37","38","39","3A","3B",
"3C","3D","3E","3F","40","41","42","43","44","45",
"46","47","48","49","4A","4B","4C","4D","4E","4F",
"50","51","52","53","54","55","56","57","58","59",
"5A","5B","5C","5D","5E","5F","60","61","62","63",
"64","65","66","67","68","69","6A","6B","6C","6D",
"6E","6F","70","71","72","73","74","75","76","77",
"78","79","7A","7B","7C","7D","7E","7F","80","81",
"82","83","84","85","86","87","88","89","8A","8B",
"8C","8D","8E","8F","90","91","92","93","94","95",
"96","97","98","99","9A","9B","9C","9D","9E","9F",
"A0","A1","A2","A3","A4","A5","A6","A7","A8","A9",
"AA","AB","AC","AD","AE","AF","B0","B1","B2","B3",
"B4","B5","B6","B7","B8","B9","BA","BB","BC","BD",
"BE","BF","C0","C1","C2","C3","C4","C5","C6","C7",
"C8","C9","CA","CB","CC","CD","CE","CF","D0","D1",
"D2","D3","D4","D5","D6","D7","D8","D9","DA","DB",
"DC","DD","DE","DF","E0","E1","E2","E3","E4","E5",
"E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",
"F0","F1","F2","F3","F4","F5","F6","F7","F8","F9",
"FA","FB","FC","FD","FE","FF",
};

void Test1(BYTE* array_de_bytes, char* cadena_de_bytes_en_formato_string){ //Cadena de bytes a string

for(int i=0; i<(int)strlen( (char*)array_de_bytes); i++)
strcat(cadena_de_bytes_en_formato_string,hextabla[(int)array_de_bytes[i]]);
printf(cadena_de_bytes_en_formato_string);
printf("\n");
}

//////////

void Test2(char* cadena_de_bytes, BYTE* cadena_de_bytes_resultante){//String a cadena de bytes

int bytes=0;
for(int i=0; i<(int)strlen( cadena_de_bytes); i+=2){
for(int j=0; j<256; j++){
if( cadena_de_bytes[i]==hextabla[j][0] && cadena_de_bytes[i+1]==hextabla[j][1] ){
cadena_de_bytes_resultante[bytes++]=j;
j=256;
}
}
}
for(int x=0; x<(int)strlen( cadena_de_bytes)/2; x++)
printf("%X",*(cadena_de_bytes_resultante+x));
printf("\n");
}

///////

int main(){//Programa

BYTE* array_de_bytes = (BYTE*)"\x68\x68\x68\x68\x68\x68\xFF\xFF\xFF\xFF\x69";
char cadena_de_bytes_en_formato_string[256];
memset(cadena_de_bytes_en_formato_string,0,sizeof(cadena_de_bytes_en_formato_string));
printf("TEST1:\n");
Test1(array_de_bytes, cadena_de_bytes_en_formato_string);
system("pause");

char* cadena_de_bytes = (char*)"686868686868FFFFFFFF69\0";
BYTE* cadena_de_bytes_resultante = (BYTE*)"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
printf("TEST2:\n");
Test2(cadena_de_bytes, cadena_de_bytes_resultante);
system("pause");

return 0;
}
voy a dejar el proyecto en MSVCPP 6
está listo para compilar en modo 'Release', pero si sólo quitan el archivo .cpp para usarlo en otro compilador, compilen en modo Release también..
DESCARGA