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#ifndef BYTEME_SOME_FILE_READER_HPP
#define BYTEME_SOME_FILE_READER_HPP
#include "Reader.hpp"
#include "RawFileReader.hpp"
#include "GzipFileReader.hpp"
#include "magic_numbers.hpp"
#include <memory>
#include <cstdio>
/**
* @file SomeFileReader.hpp
*
* @brief Read a possibly-Gzipped file.
*/
namespace byteme {
/**
* @brief Read a file that may or may not be Gzipped.
*
* This class will automatically detect whether `path` refers to a text file or a Gzip-compressed file, based on its initial magic numbers.
* After that, it will dispatch appropriately to `RawFileReader` or `GzipFileReader` respectively.
*/
class SomeFileReader : public Reader {
public:
/**
* @param path Path to the file.
* @param buffer_size Size of the buffer to use for reading.
*/
SomeFileReader(const char* path, size_t buffer_size = 65536) {
unsigned char header[3];
size_t read;
{
SelfClosingFILE file(path, "rb");
read = std::fread(header, sizeof(unsigned char), 3, file.handle);
}
if (is_gzip(header, read)) {
source.reset(new GzipFileReader(path, buffer_size));
} else {
source.reset(new RawFileReader(path, buffer_size));
}
}
/**
* @param path Path to the file.
* @param buffer_size Size of the buffer to use for reading.
*/
SomeFileReader(const std::string& path, size_t buffer_size = 65536) : SomeFileReader(path.c_str(), buffer_size) {}
bool load() {
return source->load();
}
const unsigned char* buffer() const {
return source->buffer();
}
size_t available() const {
return source->available();
}
private:
std::unique_ptr<Reader> source;
};
}
#endif
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