RawFileWriter.hpp

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#ifndef BYTEME_RAW_FILE_WRITER_HPP
#define BYTEME_RAW_FILE_WRITER_HPP
 
#include <vector>
#include <stdexcept>
#include <string>
#include <cstdio>
#include "Writer.hpp"
#include "SelfClosingFILE.hpp"
 
namespace byteme {
 
class RawFileWriter : public Writer {
public:
    RawFileWriter(const char* path, size_t buffer_size = 65536) : my_file(path, "wb") {
        if (std::setvbuf(my_file.handle, nullptr, _IOFBF, buffer_size)) {
            throw std::runtime_error("failed to set a buffer size for file writing");
        }
    }
 
    RawFileWriter(const std::string& path, size_t buffer_size = 65536) : RawFileWriter(path.c_str(), buffer_size) {}
 
public:
    using Writer::write;
 
    void write(const unsigned char* buffer, size_t n) {
        size_t ok = std::fwrite(buffer, sizeof(unsigned char), n, my_file.handle);
        if (ok < n) {
            throw std::runtime_error("failed to write raw binary file (fwrite error " + std::to_string(std::ferror(my_file.handle)) + ")");
        }
    }
 
    void finish() {
        if (std::fclose(my_file.handle)) {
            throw std::runtime_error("failed to close raw binary file");
        }
        my_file.handle = nullptr;
    }
 
private:
    SelfClosingFILE my_file;
};
 
}
 
#endif