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libbb: smaller and faster decode_base64()

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function                                             old     new   delta
decode_base64                                        195     180     -15

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2020-11-27 20:44:55 +01:00
parent dc68a5ddac
commit 170b8628fa
2 changed files with 36 additions and 101 deletions
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37
networking/httpd.c
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@@ -1017,46 +1017,9 @@ static char *encodeString(const char *string)
*/
static void decodeBase64(char *Data)
{
# if ENABLE_BASE64 || ENABLE_UUDECODE
/* Call decode_base64() from uuencode.c */
char *eptr = Data;
decode_base64(&eptr, Data);
*eptr = '\0';
# else
const unsigned char *in = (const unsigned char *)Data;
/* The decoded size will be at most 3/4 the size of the encoded */
unsigned ch = 0;
int i = 0;
while (*in) {
int t = *in++;
if (t >= '0' && t <= '9')
t = t - '0' + 52;
else if (t >= 'A' && t <= 'Z')
t = t - 'A';
else if (t >= 'a' && t <= 'z')
t = t - 'a' + 26;
else if (t == '+')
t = 62;
else if (t == '/')
t = 63;
else if (t == '=')
t = 0;
else
continue;
ch = (ch << 6) | t;
i++;
if (i == 4) {
*Data++ = (char) (ch >> 16);
*Data++ = (char) (ch >> 8);
*Data++ = (char) ch;
i = 0;
}
}
*Data = '\0';
# endif
}
#endif