106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
/*
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* Copyright (C) 2013 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REMOTE_HEADER_HPP
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#define REMOTE_HEADER_HPP
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#include <iomanip>
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namespace LmsAPI
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{
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class Header
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{
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public:
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static const std::size_t size = 8; // HeaderSize
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static const std::size_t max_data_size = 65536*64 - size;
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Header() : _dataSize(0) {}
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void setDataSize(std::size_t size) { _dataSize = size; }
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std::size_t getDataSize(void) const {return _dataSize;}
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bool from_istream(std::istream &is)
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{
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std::array<unsigned char, size> buffer;
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bool res = is.read(reinterpret_cast<char*>(buffer.data()), buffer.size());
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if (res && is.gcount() == buffer.size())
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return from_buffer(buffer);
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else
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return false;
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}
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bool from_buffer(const std::array<unsigned char, size>& buffer)
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{
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if (decode32(&buffer[0]) != _magic)
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{
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return false;
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}
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else
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{
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_dataSize = decode32(&buffer[4]);
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return _dataSize <= max_data_size;
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}
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}
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/* void to_ostream(std::ostream& os)
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{
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}*/
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void to_buffer(std::array<unsigned char, size>& buffer) const
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{
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encode32(_magic, &buffer[0]);
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encode32(_dataSize, &buffer[4]);
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}
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private:
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static uint32_t decode32(const unsigned char* data)
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{
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return (static_cast<uint32_t>(data[0]) << 24)
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+ (static_cast<uint32_t>(data[1]) << 16)
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+ (static_cast<uint32_t>(data[2]) << 8)
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+ (static_cast<uint32_t>(data[3]));
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}
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static void encode32(uint32_t value, unsigned char* data)
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{
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data[0] = (value >> 24) & 0xFF;
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data[1] = (value >> 16) & 0xFF;
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data[2] = (value >> 8) & 0xFF;
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data[3] = (value) & 0xFF;
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}
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static const uint32_t _magic = 0xdeadbeef;
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uint32_t _dataSize;
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};
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} // namespace LmsAPI
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#endif
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