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#ifndef BYTEME_ISTREAM_READER_HPP
#define BYTEME_ISTREAM_READER_HPP
#include <istream>
#include <vector>
#include <stdexcept>
#include "Reader.hpp"
/**
* @file IstreamReader.hpp
*
* @brief Read bytes from an input stream.
*/
namespace byteme {
/**
* @brief Read bytes from a `std::istream`.
*
* @tparam Pointer_ A (possibly smart) pointer to an `std::istream` object.
*
* This is just a wrapper around `std::istream::read`,
* mostly to avoid having to remember the correct way to check for end of file.
*/
template<class Pointer_ = std::istream*>
class IstreamReader : public Reader {
public:
/**
* @param input Pointer to an input stream.
* @param buffer_size Size of the buffer to use for reading.
*/
IstreamReader(Pointer_ input, size_t buffer_size = 65536) : ptr(std::move(input)), buffer_(buffer_size) {}
bool load() {
if (!okay) {
return false;
}
ptr->read(reinterpret_cast<char*>(buffer_.data()), buffer_.size());
read = ptr->gcount();
if (read < buffer_.size()) {
if (ptr->eof()) {
okay = false;
} else {
throw std::runtime_error("failed to finish reading the input stream");
}
}
return true;
}
const unsigned char* buffer() const {
return buffer_.data();
}
size_t available() const {
return read;
}
private:
Pointer_ ptr;
std::vector<unsigned char> buffer_;
size_t read = 0;
bool okay = true;
};
}
#endif
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