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Diffstat (limited to 'src/lib/encoding/binascii.c')
| -rw-r--r-- | src/lib/encoding/binascii.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/lib/encoding/binascii.c b/src/lib/encoding/binascii.c index bd063440d6..de4d1648bb 100644 --- a/src/lib/encoding/binascii.c +++ b/src/lib/encoding/binascii.c @@ -179,6 +179,18 @@ base64_encode_size(size_t srclen, int flags) return enclen; } +/** Return an upper bound on the number of bytes that might be needed to hold + * the data from decoding the base64 string <b>srclen</b>. This is only an + * upper bound, since some part of the base64 string might be padding or + * space. */ +size_t +base64_decode_maxsize(size_t srclen) +{ + tor_assert(srclen < INT_MAX / 3); + + return CEIL_DIV(srclen * 3, 4); +} + /** Internal table mapping 6 bit values to the Base64 alphabet. */ static const char base64_encode_table[64] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |