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#ifdef rfc2045_rfc2045_h_included
#ifdef rfc2045_encode_h_included
template<bool crlf>
template<typename out_iter, typename src_type>
void rfc2045::entity::line_iter<crlf>
::autoconvert_entity(const entity &e, out_iter &closure, src_type &src,
std::string_view appname)
{
char buffer[BUFSIZ];
std::function<void (const char *, size_t)> reencoder;
std::optional<rfc822::encode<out_iter &>> encoder;
bool preserve_transfer_encoding=false;
auto rewrite_transfer_encoding=e.rewrite_transfer_encoding;
switch (e.rewrite_transfer_encoding) {
case cte::error:
preserve_transfer_encoding=true;
rewrite_transfer_encoding=e.content_transfer_encoding;
break;
case cte::sevenbit:
case cte::eightbit:
reencoder=[&]
(const char *ptr, size_t n)
{
if (ptr)
closure(ptr, n);
};
break;
case cte::qp:
case cte::base64: // autoconvert_check never does this
reencoder=[encoder=std::ref(
encoder.emplace(
closure,
e.rewrite_transfer_encoding == cte::qp ?
"quoted-printable":"base64"))]
(const char *ptr, size_t n)
{
if (!ptr)
{
encoder.get().end();
return;
}
encoder(ptr, n);
};
break;
}
headers existing_headers{e, src};
existing_headers.name_lc=false;
existing_headers.keep_eol=true;
std::string content_type_header="Content-Type: " +
e.content_type.value;
if (std::string_view{e.content_type.value}.substr(0, 5) == "text/")
{
content_type_header += "; charset=";
content_type_header += e.content_type_charset();
}
content_type_header += eol;
std::string content_transfer_encoding_header;
content_transfer_encoding_header.reserve(80);
content_transfer_encoding_header =
"Content-Transfer-Encoding: ";
content_transfer_encoding_header += rfc2045::to_cte(
rewrite_transfer_encoding
);
content_transfer_encoding_header += eol;
bool mime1=e.mime1;
std::string_view mime1_0{"Mime-Version: 1.0"};
do
{
auto [name_lc, this_line_is_empty] =
existing_headers.convert_name_check_empty();
if (name_lc == "content-type")
{
if (!mime1)
{
closure(mime1_0.data(), mime1_0.size());
closure(eol.data(), eol.size());
mime1=true;
}
if (!content_type_header.empty())
closure(content_type_header.data(),
content_type_header.size());
content_type_header.clear();
continue;
}
if (name_lc == "content-transfer-encoding")
{
if (!mime1)
{
closure(mime1_0.data(), mime1_0.size());
closure(eol.data(), eol.size());
mime1=true;
}
if (!content_transfer_encoding_header.empty())
closure(content_transfer_encoding_header.data(),
content_transfer_encoding_header.size()
);
content_transfer_encoding_header.clear();
continue;
}
if (!this_line_is_empty)
{
auto current_header=existing_headers.current_header();
closure(current_header.data(), current_header.size());
}
} while (existing_headers.next());
if (!mime1)
{
closure(mime1_0.data(), mime1_0.size());
closure(eol.data(), eol.size());
}
if (!content_type_header.empty())
closure(content_type_header.data(),
content_type_header.size());
if (!content_transfer_encoding_header.empty())
closure(content_transfer_encoding_header.data(),
content_transfer_encoding_header.size()
);
if (preserve_transfer_encoding)
{
closure(eol.data(), eol.size());
// Don't bother to decode and reencode. Copy verbatim.
src.pubseekpos(e.startbody);
auto n=e.endbody-e.startbody;
while (n)
{
auto chunk=n;
if (chunk > BUFSIZ) chunk=BUFSIZ;
auto done=src.sgetn(buffer, chunk);
if (done == 0)
return; // Must be an error;
closure(buffer, done);
n -= done;
}
return;
}
closure("X-Mime-Autoconverted: from ", 27);
std::string_view cte_name{
rfc2045::to_cte(e.content_transfer_encoding)
};
closure(cte_name.data(), cte_name.size());
closure(" to ", 4);
cte_name=rfc2045::to_cte(e.rewrite_transfer_encoding);
closure(cte_name.data(), cte_name.size());
if (appname.size())
{
closure(" by ", 4);
closure(appname.data(), appname.size());
}
closure(eol.data(), eol.size());
closure(eol.data(), eol.size());
rfc822::mime_decoder do_decoder{reencoder, src};
do_decoder.decode_header=false;
do_decoder.decode(e);
reencoder(nullptr, 0);
}
#endif
#endif
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