91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
#ifndef REMOTE_HEADER_HPP
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#define REMOTE_HEADER_HPP
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#include <iomanip>
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namespace Remote
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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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std::cerr << "Header: bad magic ('" << std::hex << std::setfill('0') << std::setw(8) << decode32(&buffer[0]) << "' instead of '" << std::hex << std::setfill('0') << std::setw(8) << _magic << "')" << std::endl;
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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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if (_dataSize > max_data_size)
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std::cerr << "Header: msg too big (" << _dataSize << ")!" << std::endl;
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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 Remote
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#endif
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