Initialize at openlb-1-3

1 files changed, 82 insertions, 0 deletions

diff --git a/src/io/base64.h b/src/io/base64.h
new file mode 100644
index 0000000..f2248e6
--- /dev/null
+++ b/src/io/base64.h
@@ -0,0 +1,82 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2007 Jonas Latt
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+/* Acknowledgment: The strategy adopted here to encode
+ * and decode Base64, and in particular the expression of the
+ * arrays Base64Encoder::enc64 and Base64Decoder::dec64,
+ * is inspired by the open source library b64 by Bob Trower,
+ * which is distributed with a MIT license at the address
+ * http://base64.sourceforge.net/b64.c
+ */
+
+
+#ifndef BASE64_H
+#define BASE64_H
+
+#include <iosfwd>
+
+namespace olb {
+
+template<typename T>
+class Base64Encoder {
+public:
+  Base64Encoder(std::ostream& ostr_, size_t fullLength_);
+  void encode(const T* data, size_t length);
+private:
+  void fillOverflow(const unsigned char* charData, size_t charLength, size_t& pos);
+  void flushOverflow();
+  void writeSize();
+  void encodeBlock( const unsigned char* data);
+  void encodeUnfinishedBlock( const unsigned char* data, int length);
+private:
+  static const char enc64[65];
+private:
+  std::ostream& ostr;
+  size_t charFullLength;
+  size_t numWritten;
+  int numOverflow;
+  unsigned char overflow[3];
+};
+
+template<typename T>
+class Base64Decoder {
+public:
+  Base64Decoder(std::istream& istr_, size_t fullLength_);
+  void decode(T* data, size_t length);
+private:
+  void flushOverflow(unsigned char* charData, size_t charLength, size_t& pos);
+  unsigned char getNext();
+  void decodeBlock(unsigned char* data);
+private:
+  static const char dec64[82];
+private:
+  std::istream& istr;
+  size_t charFullLength;
+  size_t numRead;
+  int posOverflow;
+  unsigned char overflow[3];
+};
+
+} // namespace olb
+
+#endif