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#ifndef BYTEME_GZIP_FILE_READER_HPP
#define BYTEME_GZIP_FILE_READER_HPP
#include "zlib.h"
#include <stdexcept>
#include <vector>
#include <string>
#include "SelfClosingGzFile.hpp"
#include "Reader.hpp"
/**
* @file GzipFileReader.hpp
*
* @brief Read a Gzip-compressed file.
*/
namespace byteme {
/**
* @brief Read uncompressed bytes from a Gzip-compressed file.
*
* This is basically a wrapper around Zlib's `gzFile` with correct closing and error checking.
*/
class GzipFileReader : public Reader {
public:
/**
* @param path Path to the file.
* @param buffer_size Size of the buffer to use for reading.
*/
GzipFileReader(const char* path, size_t buffer_size = 65536) : gz(path, "rb"), buffer_(buffer_size) {}
/**
* @param path Path to the file.
* @param buffer_size Size of the buffer to use for reading.
*/
GzipFileReader(const std::string& path, size_t buffer_size = 65536) : GzipFileReader(path.c_str(), buffer_size) {}
public:
bool load() {
read = gzread(gz.handle, buffer_.data(), buffer_.size());
if (read) {
return true;
}
if (!gzeof(gz.handle)) {
int dummy;
throw std::runtime_error(gzerror(gz.handle, &dummy));
}
return false;
}
const unsigned char* buffer() const {
return buffer_.data();
}
size_t available() const {
return read;
}
private:
SelfClosingGzFile gz;
std::vector<unsigned char> buffer_;
size_t read = 0;
};
}
#endif
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