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Slight optimization to decode_base64.

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Bobbi Webber-Manners 2020-07-28 23:03:27 -04:00
parent 514ff964e2
commit 854227751d
1 changed files with 4 additions and 3 deletions
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7
apps/email.c
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@ -592,12 +592,13 @@ static const int8_t b64dec[] =
*/
uint16_t decode_base64(char *p) {
uint16_t i = 0, j = 0;
const int8_t *b = b64dec - 43;
while (p[i] != '\r') {
p[j++] = b64dec[p[i] - 43] << 2 | b64dec[p[i + 1] - 43] >> 4;
p[j++] = b[p[i]] << 2 | b[p[i + 1]] >> 4;
if (p[i + 2] != '=')
p[j++] = b64dec[p[i + 1] - 43] << 4 | b64dec[p[i + 2] - 43] >> 2;
p[j++] = b[p[i + 1]] << 4 | b[p[i + 2]] >> 2;
if (linebuf[i + 3] != '=')
p[j++] = b64dec[p[i + 2] - 43] << 6 | b64dec[p[i + 3] - 43];
p[j++] = b[p[i + 2]] << 6 | b[p[i + 3]];
i += 4;
}
return j;