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base64: Reformat _bin_to_base64()

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Fixes T188

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
(cherry picked from commit fe9991b3c6)
This commit is contained in:
Andreas Schneider
2019-10-31 16:22:20 +01:00
parent 31f65d1ffb
commit d5b10f569d
1 changed files with 25 additions and 22 deletions
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47
src/base64.c
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@@ -234,29 +234,32 @@ static int get_equals(char *string) {
}
/* thanks sysk for debugging my mess :) */
static void _bin_to_base64(unsigned char *dest,
const unsigned char source[3],
int len)
{
#define BITS(n) ((1 << (n)) - 1)
static void _bin_to_base64(unsigned char *dest, const unsigned char source[3],
int len) {
switch (len) {
case 1:
dest[0] = alphabet[(source[0] >> 2)];
dest[1] = alphabet[((source[0] & BITS(2)) << 4)];
dest[2] = '=';
dest[3] = '=';
break;
case 2:
dest[0] = alphabet[source[0] >> 2];
dest[1] = alphabet[(source[1] >> 4) | ((source[0] & BITS(2)) << 4)];
dest[2] = alphabet[(source[1] & BITS(4)) << 2];
dest[3] = '=';
break;
case 3:
dest[0] = alphabet[(source[0] >> 2)];
dest[1] = alphabet[(source[1] >> 4) | ((source[0] & BITS(2)) << 4)];
dest[2] = alphabet[ (source[2] >> 6) | (source[1] & BITS(4)) << 2];
dest[3] = alphabet[source[2] & BITS(6)];
break;
}
switch (len) {
case 1:
dest[0] = alphabet[(source[0] >> 2)];
dest[1] = alphabet[((source[0] & BITS(2)) << 4)];
dest[2] = '=';
dest[3] = '=';
break;
case 2:
dest[0] = alphabet[source[0] >> 2];
dest[1] = alphabet[(source[1] >> 4) | ((source[0] & BITS(2)) << 4)];
dest[2] = alphabet[(source[1] & BITS(4)) << 2];
dest[3] = '=';
break;
case 3:
dest[0] = alphabet[(source[0] >> 2)];
dest[1] = alphabet[(source[1] >> 4) | ((source[0] & BITS(2)) << 4)];
dest[2] = alphabet[(source[2] >> 6) | (source[1] & BITS(4)) << 2];
dest[3] = alphabet[source[2] & BITS(6)];
break;
}
#undef BITS
}
/**