#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static const unsigned char pr2six[256] =
{
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
int Base64decode( char * bufplain, const char * bufcoded )
{
int nbytesdecoded;
register const unsigned char *bufin;
register unsigned char *bufout;
register int nprbytes;
bufin = (const unsigned char *) bufcoded;
while (pr2six[*(bufin++)] <= 63);
nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
nbytesdecoded = ((nprbytes + 3) / 4) * 3;
bufout = (unsigned char *) bufplain;
bufin = (const unsigned char *) bufcoded;
while (nprbytes > 4)
{
*(bufout++) = (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
*(bufout++) = (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
*(bufout++) = (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
bufin += 4;
nprbytes -= 4;
}
if (nprbytes > 1)
{
*(bufout++) = (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
}
if (nprbytes > 2)
{
*(bufout++) = (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
}
if (nprbytes > 3)
{
*(bufout++) = (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
}
*(bufout++) = '\0';
nbytesdecoded -= (4 - nprbytes) & 3;
return nbytesdecoded;
}
int main( void )
{
char * encoded = "eyJtZXNzYWdlIjoxLCJhZGQiOjEsInZhbHVlIjoiMSJ9";
char decoded[ 100 ] = {0};
Base64decode( decoded, encoded );
printf("String codificada : %s\n", encoded
); printf("String decodificada: %s\n", decoded
);
return 0;
}
/* fim-de-arquivo */
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