block_source.hpp

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#ifndef EAGINE_SERIALIZE_BLOCK_SOURCE_HPP
#define EAGINE_SERIALIZE_BLOCK_SOURCE_HPP
 
#include "../memory/block.hpp"
#include "../memory/span_algo.hpp"
#include "data_source.hpp"
#include <istream>
 
namespace eagine {
//------------------------------------------------------------------------------
class block_data_source : public deserializer_data_source {
public:
    block_data_source() noexcept = default;
 
    block_data_source(memory::const_block src) noexcept
      : _src{src} {}
 
    void reset(memory::const_block src) {
        _src = src;
        _done = 0;
    }
 
    auto top(span_size_t req_size) -> memory::const_block final {
        return head(skip(_src, _done), req_size);
    }
 
    void pop(span_size_t del_size) final {
        _done += del_size;
    }
 
    auto remaining() const noexcept -> memory::const_block {
        return skip(_src, _done);
    }
 
private:
    memory::const_block _src{};
    span_size_t _done{0};
};
//------------------------------------------------------------------------------
} // namespace eagine
 
#endif // EAGINE_SERIALIZE_BLOCK_SOURCE_HPP