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eb03290754
The minimum length of an encoded-word is actually the pure encoding overhead plus the length of the `output-charset` plus the minimum unit of encoded text, which is 4 for B-encoding and (for simplicity) 3 for Q-encoding. We also cater to the possibility that we need further encoded words, which would be split by the `line-break-chars` followed by a space character. Obviously, the former `out_charset_len + 12` is too simplistic and wrong in the given case (where the magic number would be 13). These simplifications are somewhat wasteful, but iconv_mime_encode() with Q-encoding is wasteful anyway (see bug 66828[1]), and the proper solution to convert the whole input to the desired output charset upfront, and applying the encoding afterwards appears too much a change for the stable releases. [1] <https://bugs.php.net/66828>