blob: 554a7b870fce5e9c8b6f0728c0447f9ad1df6475 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2018 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx 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 3 of the License, or (at your option) any later version.
*
* ndn-cxx 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 copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#include "base64-encode.hpp"
#include "../detail/openssl.hpp"
namespace ndn {
namespace security {
namespace transform {
/**
* @brief The implementation class which contains the internal state of the filter
* which includes openssl specific structures.
*/
class Base64Encode::Impl
{
public:
Impl()
: m_base64(BIO_new(BIO_f_base64()))
, m_sink(BIO_new(BIO_s_mem()))
{
// connect base64 transform to the data sink.
BIO_push(m_base64, m_sink);
}
~Impl()
{
BIO_free_all(m_base64);
}
public:
BIO* m_base64;
BIO* m_sink; // BIO_f_base64 alone does not work without a sink
};
Base64Encode::Base64Encode(bool needBreak)
: m_impl(make_unique<Impl>())
{
if (!needBreak)
BIO_set_flags(m_impl->m_base64, BIO_FLAGS_BASE64_NO_NL);
}
Base64Encode::~Base64Encode() = default;
void
Base64Encode::preTransform()
{
fillOutputBuffer();
}
size_t
Base64Encode::convert(const uint8_t* data, size_t dataLen)
{
if (dataLen == 0)
return 0;
int wLen = BIO_write(m_impl->m_base64, data, dataLen);
if (wLen <= 0) { // fail to write data
if (!BIO_should_retry(m_impl->m_base64)) {
// we haven't written everything but some error happens, and we cannot retry
BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to accept more input"));
}
return 0;
}
else { // update number of bytes written
fillOutputBuffer();
return wLen;
}
}
void
Base64Encode::finalize()
{
if (BIO_flush(m_impl->m_base64) != 1)
BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to flush"));
while (!isConverterEmpty()) {
fillOutputBuffer();
while (!isOutputBufferEmpty()) {
flushOutputBuffer();
}
}
}
void
Base64Encode::fillOutputBuffer()
{
int nRead = BIO_pending(m_impl->m_sink);
if (nRead <= 0)
return;
// there is something to read from BIO
auto buffer = make_unique<OBuffer>(nRead);
int rLen = BIO_read(m_impl->m_sink, buffer->data(), nRead);
if (rLen < 0)
return;
if (rLen < nRead)
buffer->erase(buffer->begin() + rLen, buffer->end());
setOutputBuffer(std::move(buffer));
}
bool
Base64Encode::isConverterEmpty()
{
return (BIO_pending(m_impl->m_sink) <= 0);
}
unique_ptr<Transform>
base64Encode(bool needBreak)
{
return make_unique<Base64Encode>(needBreak);
}
} // namespace transform
} // namespace security
} // namespace ndn