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/*
* BigInt Input/Output
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/bigint.h>
#include <iostream>
namespace Botan {
/*
* Write the BigInt into a stream
*/
std::ostream& operator<<(std::ostream& stream, const BigInt& n)
{
BigInt::Base base = BigInt::Decimal;
if(stream.flags() & std::ios::hex)
base = BigInt::Hexadecimal;
else if(stream.flags() & std::ios::oct)
throw std::runtime_error("Octal output of BigInt not supported");
if(n == 0)
stream.write("0", 1);
else
{
if(n < 0)
stream.write("-", 1);
const std::vector<byte> buffer = BigInt::encode(n, base);
size_t skip = 0;
while(skip < buffer.size() && buffer[skip] == '0')
++skip;
stream.write(reinterpret_cast<const char*>(&buffer[0]) + skip,
buffer.size() - skip);
}
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;
}
}
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