Move Zlib and Hashing libs to third_party directory

third_party/hashing/hashers/md5.h

@@ -0,0 +1,61 @@
+// //////////////////////////////////////////////////////////
+// md5.h
+// Copyright (c) 2014 Stephan Brumme. All rights reserved.
+// see http://create.stephan-brumme.com/disclaimer.html
+//
+
+#pragma once
+
+#include "../hashing.h"
+
+/// compute MD5 hash
+/** Usage:
+    MD5 md5;
+    std::string myHash  = md5("Hello World");     // std::string
+    std::string myHash2 = md5("How are you", 11); // arbitrary data, 11 bytes
+
+    // or in a streaming fashion:
+
+    MD5 md5;
+    while (more data available)
+      md5.add(pointer to fresh data, number of new bytes);
+    std::string myHash3 = md5.getHash();
+  */
+class MD5 //: public Hash
+{
+public:
+  /// same as reset()
+  MD5();
+
+  /// compute MD5 of a memory block
+  const char* operator()(const void* data, size_t numBytes);
+  /// compute MD5 of a string, excluding final zero
+  const char* operator()(const char* text, size_t size);
+
+  /// add arbitrary number of bytes
+  void add(const void* data, size_t numBytes);
+
+  /// return latest hash as 16 hex characters
+  const char* getHash();
+
+  /// restart
+  void reset();
+
+private:
+  /// process 64 bytes
+  void processBlock(const void* data);
+  /// process everything left in the internal buffer
+  void processBuffer();
+
+  /// split into 64 byte blocks (=> 512 bits)
+  enum { BlockSize = 512 / 8 };
+
+  /// size of processed data in bytes
+  uint64_t m_numBytes;
+  /// valid bytes in m_buffer
+  size_t   m_bufferSize;
+  /// bytes not processed yet
+  uint8_t  m_buffer[BlockSize];
+  /// hash, stored as integers
+  uint32_t m_hash[4];
+};