Add macros for baseXX encoding lengths

#include "testsupport.h"

#include "torint.h"

/** @{ */

/** These macros don't check for overflow.  Use them only for constant inputs

 * (like array declarations).  The *_LEN macros are the raw encoding lengths

 * (without terminating NUL), while the *_BUFSIZE macros count the terminating

 * NUL. */

#define BASE64_LEN(n) (CEIL_DIV((n), 3) * 4)

#define BASE32_LEN(n) (CEIL_DIV((n), 5) * 8)

#define BASE16_LEN(n) ((n) * 2)

#define BASE64_BUFSIZE(n) (BASE64_LEN(n) + 1)

#define BASE32_BUFSIZE(n) (BASE32_LEN(n) + 1)

#define BASE16_BUFSIZE(n) (BASE16_LEN(n) + 1)

#define BASE64_NOPAD_LEN(n) (CEIL_DIV((n) * 4, 3)

#define BASE32_NOPAD_LEN(n) (CEIL_DIV((n) * 8, 5)

#define BASE64_NOPAD_BUFSIZE(n) (BASE64_NOPAD_LEN(n) + 1))

#define BASE32_NOPAD_BUFSIZE(n) (BASE32_NOPAD_LEN(n) + 1))

/** @} */

#define BASE64_ENCODE_MULTILINE 1

size_t base64_encode_size(size_t srclen, int flags);

int base64_encode(char *dest, size_t destlen, const char *src, size_t srclen,