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Diffstat (limited to 'contrib/epee/include/net/levin_helper.h')
| -rw-r--r-- | contrib/epee/include/net/levin_helper.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/contrib/epee/include/net/levin_helper.h b/contrib/epee/include/net/levin_helper.h new file mode 100644 index 000000000..a8406103c --- /dev/null +++ b/contrib/epee/include/net/levin_helper.h @@ -0,0 +1,137 @@ +// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are met: +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// * Neither the name of the Andrey N. Sabelnikov nor the +// names of its contributors may be used to endorse or promote products +// derived from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY +// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// + + + +#pragma once + +#include "levin_base.h" +#include "serializeble_struct_helper.h" + +namespace epee +{ +namespace levin +{ + template<class t_struct> + bool pack_struct_to_levin_message(const t_struct& t, std::string& buff, int command_id) + { + buff.resize(sizeof(levin::bucket_head)); + levin::bucket_head& head = *(levin::bucket_head*)(&buff[0]); + head.m_signature = LEVIN_SIGNATURE; + head.m_cb = 0; + head.m_have_to_return_data = true; + head.m_command = command_id; + head.m_return_code = 1; + head.m_reservedA = rand(); //probably some flags in future + head.m_reservedB = rand(); //probably some check summ in future + + std::string buff_strg; + if(!StorageNamed::save_struct_as_storage_to_buff_t<t_struct, StorageNamed::DefaultStorageType>(t, buff_strg)) + return false; + + head.m_cb = buff_strg.size(); + buff.append(buff_strg); + return true; + } + + + bool pack_data_to_levin_message(const std::string& data, std::string& buff, int command_id) + { + buff.resize(sizeof(levin::bucket_head)); + levin::bucket_head& head = *(levin::bucket_head*)(&buff[0]); + head.m_signature = LEVIN_SIGNATURE; + head.m_cb = 0; + head.m_have_to_return_data = true; + head.m_command = command_id; + head.m_return_code = 1; + head.m_reservedA = rand(); //probably some flags in future + head.m_reservedB = rand(); //probably some check summ in future + + head.m_cb = data.size(); + buff.append(data); + return true; + } + + bool load_levin_data_from_levin_message(std::string& levin_data, const std::string& buff, int& command) + { + if(buff.size() < sizeof(levin::bucket_head) ) + { + LOG_PRINT_L3("size of buff(" << buff.size() << ") is too small, at load_struct_from_levin_message"); + return false; + } + + levin::bucket_head& head = *(levin::bucket_head*)(&buff[0]); + if(head.m_signature != LEVIN_SIGNATURE) + { + LOG_PRINT_L3("Failed to read signature in levin message, at load_struct_from_levin_message"); + return false; + } + if(head.m_cb != buff.size()-sizeof(levin::bucket_head)) + { + LOG_PRINT_L3("sizes missmatch, at load_struct_from_levin_message"); + return false; + } + + //std::string buff_strg; + levin_data.assign(&buff[sizeof(levin::bucket_head)], buff.size()-sizeof(levin::bucket_head)); + command = head.m_command; + return true; + } + + template<class t_struct> + bool load_struct_from_levin_message(t_struct& t, const std::string& buff, int& command) + { + if(buff.size() < sizeof(levin::bucket_head) ) + { + LOG_ERROR("size of buff(" << buff.size() << ") is too small, at load_struct_from_levin_message"); + return false; + } + + levin::bucket_head& head = *(levin::bucket_head*)(&buff[0]); + if(head.m_signature != LEVIN_SIGNATURE) + { + LOG_ERROR("Failed to read signature in levin message, at load_struct_from_levin_message"); + return false; + } + if(head.m_cb != buff.size()-sizeof(levin::bucket_head)) + { + LOG_ERROR("sizes missmatch, at load_struct_from_levin_message"); + return false; + } + + std::string buff_strg; + buff_strg.assign(&buff[sizeof(levin::bucket_head)], buff.size()-sizeof(levin::bucket_head)); + + if(!StorageNamed::load_struct_from_storage_buff_t<t_struct, StorageNamed::DefaultStorageType>(t, buff_strg)) + { + LOG_ERROR("Failed to read storage, at load_struct_from_levin_message"); + return false; + } + command = head.m_command; + return true; + } +} +}
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