SomeFileReader.hpp

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#ifndef BYTEME_SOME_FILE_READER_HPP
#define BYTEME_SOME_FILE_READER_HPP
 
#include <memory>
#include <cstdio>
#include <cstddef>
 
#include "Reader.hpp"
#include "RawFileReader.hpp"
#include "GzipFileReader.hpp"
#include "magic_numbers.hpp"
 
namespace byteme {
 
struct SomeFileReaderOptions {
    std::size_t buffer_size = 65536;
};
 
class SomeFileReader final : public Reader {
public:
    SomeFileReader(const char* path, const SomeFileReaderOptions& options) { 
        unsigned char header[3];
        std::size_t read;
        {
            SelfClosingFILE file(path, "rb");
            read = std::fread(header, sizeof(unsigned char), 3, file.handle);
        }
 
        if (is_gzip(header, read)) {
            GzipFileReaderOptions gopt;
            gopt.buffer_size = options.buffer_size;
            my_source.reset(new GzipFileReader(path, gopt));
        } else {
            RawFileReaderOptions ropt;
            ropt.buffer_size = options.buffer_size;
            my_source.reset(new RawFileReader(path, ropt));
        }
    }
 
public:
    bool load() {
        return my_source->load();
    }
 
    const unsigned char* buffer() const {
        return my_source->buffer();
    }
 
    std::size_t available() const {
        return my_source->available();
    }
 
private:
    std::unique_ptr<Reader> my_source;
};
 
}
 
#endif