From 13d08cbe978c4cd0de01aa0120c39470508cbbcb Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Tue, 30 Sep 2008 22:41:49 +0000
Subject: Rearrange BigInt directories:   math/bigint - BigInt implementation  
 math/numbertheory - Math stuff built on top of BigInt

Coming soon: math/gfp (parts of pk/ecdsa)

Update deps in the pk files
---
 src/math/bigint/big_io.cpp | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/math/bigint/big_io.cpp

(limited to 'src/math/bigint/big_io.cpp')

diff --git a/src/math/bigint/big_io.cpp b/src/math/bigint/big_io.cpp
new file mode 100644
index 000000000..3c201e8b2
--- /dev/null
+++ b/src/math/bigint/big_io.cpp
@@ -0,0 +1,53 @@
+/*************************************************
+* BigInt Input/Output Source File                *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#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)
+      base = BigInt::Octal;
+
+   if(n == 0)
+      stream.write("0", 1);
+   else
+      {
+      if(n < 0)
+         stream.write("-", 1);
+      SecureVector<byte> buffer = BigInt::encode(n, base);
+      u32bit skip = 0;
+      while(buffer[skip] == '0' && skip < buffer.size())
+         ++skip;
+      stream.write(reinterpret_cast<const char*>(buffer.begin()) + 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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