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/*
* net/mime - MIME utilities
*
* Copyright (C) 2010--2011 Enrico Zini <enrico@enricozini.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <wibble/net/mime.h>
#include <wibble/exception.h>
#include <wibble/string.h>
#include <unistd.h>
using namespace std;
namespace wibble {
namespace net {
namespace mime {
Reader::Reader()
: header_splitter("^([^:[:blank:]]+)[[:blank:]]*:[[:blank:]]*(.+)", 3)
{
}
bool Reader::read_line(int sock, string& res)
{
bool has_cr = false;
res.clear();
while (true)
{
char c;
ssize_t count = read(sock, &c, 1);
if (count == 0) return false;
if (count < 0)
throw wibble::exception::System("reading from socket");
switch (c)
{
case '\r':
if (has_cr)
res.append(1, '\r');
has_cr = true;
break;
case '\n':
if (has_cr)
return true;
else
res.append(1, '\n');
break;
default:
res.append(1, c);
break;
}
}
}
bool Reader::read_headers(int sock, std::map<std::string, std::string>& headers)
{
string line;
map<string, string>::iterator last_inserted = headers.end();
while (read_line(sock, line))
{
// Headers are terminated by an empty line
if (line.empty())
return true;
if (isblank(line[0]))
{
// Append continuation of previous header body
if (last_inserted != headers.end())
{
last_inserted->second.append(" ");
last_inserted->second.append(str::trim(line));
}
} else {
if (header_splitter.match(line))
{
// rfc2616, 4.2 Message Headers:
// Multiple message-header fields with
// the same field-name MAY be present
// in a message if and only if the
// entire field-value for that header
// field is defined as a
// comma-separated list [i.e.,
// #(values)]. It MUST be possible to
// combine the multiple header fields
// into one "field-name: field-value"
// pair, without changing the semantics
// of the message, by appending each
// subsequent field-value to the first,
// each separated by a comma.
string key = str::tolower(header_splitter[1]);
string val = str::trim(header_splitter[2]);
map<string, string>::iterator old = headers.find(key);
if (old == headers.end())
{
// Insert new
pair< map<string, string>::iterator, bool > res =
headers.insert(make_pair(key, val));
last_inserted = res.first;
} else {
// Append comma-separated
old->second.append(",");
old->second.append(val);
last_inserted = old;
}
} else
last_inserted = headers.end();
}
}
return false;
}
bool Reader::readboundarytail(int sock)
{
// [\-\s]*\r\n
bool has_cr = false;
bool has_dash = false;
while (true)
{
char c;
ssize_t count = read(sock, &c, 1);
if (count == 0) throw wibble::exception::Consistency("reading from socket", "data ends before MIME boundary");
if (count < 0) throw wibble::exception::System("reading from socket");
switch (c)
{
case '\r':
has_cr = true;
break;
case '\n':
if (has_cr) return !has_dash;
break;
case '\t':
case ' ':
has_cr = false;
break;
case '-':
has_dash = true;
has_cr = false;
break;
default:
throw wibble::exception::Consistency("reading from socket", "line ends with non-whitespace");
break;
}
}
}
bool Reader::read_until_boundary(int sock, const std::string& boundary, std::ostream& out, size_t max)
{
size_t read_so_far = 0;
unsigned got = 0;
while (got < boundary.size())
{
char c;
ssize_t count = read(sock, &c, 1);
if (count == 0) throw wibble::exception::Consistency("reading from socket", "data ends before MIME boundary");
if (count < 0) throw wibble::exception::System("reading from socket");
if (c == boundary[got])
++got;
else
{
if (max == 0 || read_so_far < max)
{
if (got > 0)
{
out.write(boundary.data(), got);
read_so_far += got;
}
out.put(c);
++read_so_far;
}
got = 0;
}
}
return readboundarytail(sock);
}
bool Reader::discard_until_boundary(int sock, const std::string& boundary)
{
unsigned got = 0;
while (got < boundary.size())
{
char c;
ssize_t count = read(sock, &c, 1);
if (count == 0) throw wibble::exception::Consistency("reading from socket", "data ends before MIME boundary");
if (count < 0) throw wibble::exception::System("reading from socket");
if (c == boundary[got])
++got;
else
got = 0;
}
return readboundarytail(sock);
}
}
}
}
// vim:set ts=4 sw=4:
|
