ChunkedBufferReader.hpp

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#ifndef BYTEME_CHUNKED_BUFFER_READER_HPP
#define BYTEME_CHUNKED_BUFFER_READER_HPP
 
#include <cstddef>
#include <algorithm>
 
#include "Reader.hpp"
 
namespace byteme {
 
class ChunkedBufferReader final : public byteme::Reader {
public:
    ChunkedBufferReader(const unsigned char* buffer, std::size_t length, std::size_t chunk_size) : my_buffer(buffer), my_length(length), my_chunk_size(chunk_size) {
        my_position = -my_chunk_size; // deliberate underflow so that load() overflows to zero.
    }
 
public:
    bool load() {
        my_position += my_chunk_size; 
        return (my_position < my_length);
    }
 
    const unsigned char * buffer () const {
        return my_buffer + my_position;
    }
 
    std::size_t available() const {
        return std::min(my_chunk_size, my_length - my_position);
    }
 
private:
    const unsigned char* my_buffer;
    std::size_t my_length;
    std::size_t my_position;
    std::size_t my_chunk_size;
};
 
}
 
#endif