big_io.cpp

Go to the documentation of this file.

/*
* BigInt Input/Output
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/bigint.h>
 
#include <botan/exceptn.h>
#include <istream>
#include <ostream>
 
namespace Botan {
 
/*
* Write the BigInt into a stream
*/
std::ostream& operator<<(std::ostream& stream, const BigInt& n) {
   const auto stream_flags = stream.flags();
   if((stream_flags & std::ios::oct) != 0) {
      throw Invalid_Argument("Octal output of BigInt not supported");
   }
 
   const size_t base = (stream_flags & std::ios::hex) != 0 ? 16 : 10;
 
   if(base == 10) {
      stream << n.to_dec_string();
   } else {
      stream << n.to_hex_string();
   }
 
   if(!stream.good()) {
      throw Stream_IO_Error("BigInt output operator has failed");
   }
   return stream;
}
 
/*
* Read the BigInt from a stream
*/
std::istream& operator>>(std::istream& stream, BigInt& n) {
   std::string str;
   std::getline(stream, str);
   if(stream.bad() || (stream.fail() && !stream.eof())) {
      throw Stream_IO_Error("BigInt input operator has failed");
   }
   n = BigInt(str);
   return stream;
}
 
}  // namespace Botan