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Improved parsing of "charset" parameter in MIME Content-Type header.
In Issue #177, the reported problem message header was "Content-Type: text/plain; charset=utf-8; format=flowed" The fact that the "charset" value was not quoted and not space delimited means the charset would have been parsed as "utf-8;", which would not provide an exact match (against "utf-8") in smb_msg_is_utf8() and thus the message body would not be considered to be utf-8 encoded. The solution is to terminate the "charset" parameter value at the semicolon, if it exists, and the value was not quoted. Also, for good measure, only search for " charset" or ";charset" to avoid false-positive parameter matches, like "notcharset".
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