RawFileReader.hpp

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#ifndef BYTEME_RAW_FILE_READER_HPP
#define BYTEME_RAW_FILE_READER_HPP
 
#include <vector>
#include <stdexcept>
#include <string>
#include <cstdio>
#include "Reader.hpp"
#include "SelfClosingFILE.hpp"
 
namespace byteme {
 
class RawFileReader : public Reader {
public:
    RawFileReader(const char* path, size_t buffer_size = 65536) : my_file(path, "rb"), my_buffer(buffer_size) {}
 
    RawFileReader(const std::string& path, size_t buffer_size = 65536) : RawFileReader(path.c_str(), buffer_size) {}
 
public:
    bool load() {
        if (!my_okay) {
            return false;
        }
 
        auto& handle = my_file.handle;
        my_read = std::fread(my_buffer.data(), sizeof(unsigned char), my_buffer.size(), handle);
 
        if (my_read < my_buffer.size()) {
            if (std::feof(handle)) {
                my_okay = false;
            } else {
                throw std::runtime_error("failed to read raw binary file (fread error " + std::to_string(std::ferror(handle)) + ")");
            }
        }
 
        return true;
    }
 
    const unsigned char* buffer() const {
        return my_buffer.data();
    }
 
    size_t available() const {
        return my_read;
    }
 
private:
    SelfClosingFILE my_file;
    std::vector<unsigned char> my_buffer;
    size_t my_read = 0;
    bool my_okay = true;
};
 
}
 
#endif