Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Foundation/include/Poco/DigestStream.h

@@ -0,0 +1,100 @@
+//
+// DigestStream.h
+//
+// Library: Foundation
+// Package: Crypt
+// Module:  DigestStream
+//
+// Definition of classes DigestInputStream and DigestOutputStream.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_DigestStream_INCLUDED
+#define Foundation_DigestStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/BufferedStreamBuf.h"
+#include "Poco/DigestEngine.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API DigestBuf: public BufferedStreamBuf
+	/// This streambuf computes a digest of all data going
+	/// through it.
+{
+public:
+	DigestBuf(DigestEngine& eng);
+	DigestBuf(DigestEngine& eng, std::istream& istr);
+	DigestBuf(DigestEngine& eng, std::ostream& ostr);
+	~DigestBuf();	
+	int readFromDevice(char* buffer, std::streamsize length);
+	int writeToDevice(const char* buffer, std::streamsize length);
+	void close();
+
+private:
+	DigestEngine& _eng;
+	std::istream* _pIstr;
+	std::ostream* _pOstr;
+	static const int BUFFER_SIZE;
+};
+
+
+class Foundation_API DigestIOS: public virtual std::ios
+	/// The base class for DigestInputStream and DigestOutputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	DigestIOS(DigestEngine& eng);
+	DigestIOS(DigestEngine& eng, std::istream& istr);
+	DigestIOS(DigestEngine& eng, std::ostream& ostr);
+	~DigestIOS();
+	DigestBuf* rdbuf();
+
+protected:
+	DigestBuf _buf;
+};
+
+
+class Foundation_API DigestInputStream: public DigestIOS, public std::istream
+	/// This istream computes a digest of
+	/// all the data passing through it,
+	/// using a DigestEngine.
+{
+public:
+	DigestInputStream(DigestEngine& eng, std::istream& istr);
+	~DigestInputStream();
+};
+
+
+class Foundation_API DigestOutputStream: public DigestIOS, public std::ostream
+	/// This ostream computes a digest of
+	/// all the data passing through it,
+	/// using a DigestEngine.
+	/// To ensure that all data has been incorporated
+	/// into the digest, call close() or flush() before 
+	/// you obtain the digest from the digest engine.
+{
+public:
+	DigestOutputStream(DigestEngine& eng);
+	DigestOutputStream(DigestEngine& eng, std::ostream& ostr);
+	~DigestOutputStream();
+	void close();
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_DigestStream_INCLUDED