/*

* BigInt Input/Output

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/bigint.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) {

      throw Invalid_Argument("Octal output of BigInt not supported");

   }

   const size_t base = (stream_flags & std::ios::hex) ? 16 : 10;

   std::string enc;

   if(base == 10) {

      enc = n.to_dec_string();

   } else {

      enc = n.to_hex_string();

   }

   stream.write(enc.data(), enc.size());

   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