\section{Implementation Specification}
-\subsection{Building \pname}
+\subsection{Theory of operation}
+\subsubsection{Overview}
+
+The program is implemented using standard C++.
+
+While the data structures according to \cite{ser16:progref}
+are designed consequently object oriented,
+most of the actual processing of the data after reading in is done
+by the routines contained in
+\verb|main.cpp|, \verb|config.cpp| and \verb|tool.cpp|.
+
+Program configuration is capsuled into the class \verb|configuration_manager|,
+used by the routines in \verb|config.cpp|.
+
+\subsubsection{Program flow}
+The \verb|main()| routine sets up the working environment using the \verb|do_config()|
+subroutine contained in \verb|config.cpp|. This contains parsing the command line,
+reading a configuration file, and setting the global \verb|cfg_*| flags. The input and
+output file descriptors \verb|in_fd| and \verb|out_fd| are assigned to 0 and 1 respective
+files as stated in the configuration (command line option or configuration file).
+The \verb|configuration_manager| is able to dynamically generate help output for all
+options.
+
+The next call is \verb|read_tape()|, the data input routine. In \verb|read_tape()|,
+the static factory method \verb|tape_block::gen_from_fd()| is used to create and
+check blocks, taking data directly from the global file descriptor \verb|in_fd|.\\
+At the end of \verb|read_tape()|, the vector \verb|tape| has been filled with
+pointers to instances of \verb|tape_block|.
+
+In the next step, the routine \verb|process_tape()| is called, in which
+integrity checks on object level and splitting to files (if desired)
+are accomplished. Every valid and complete object consist of either one
+single \verb|eot_block| or a series of \verb|data_block|s, while the last block
+of each object must be one of the types which mark the end of an object.
+
+After all that, \verb|process_symbols()| is called. This routine generates three vectors
+containing symbol names: \verb|exported|, \verb|called|, and \verb|unsatisfied|.
+The latter is the difference of \verb|called| and \verb|exported|.\\
+If desired, those vectors are written out to \verb|out_fd|, one symbol per line.
+\subsubsection{Block factory}
+The software makes use of C++ virtual methods allowing for convinient processing of
+multiple kinds of blocks without knowing much about the block type currently worked
+on.\\
+The block factory consists of the static factory method \verb|tape_block::gen_from_fd()|
+and a corresponding private constructor of class \verb|tape_block|. The constructor
+creates a block and reads data from the given file descriptor. The factory method
+then tries to determine the block's type and recreate an object of the most accurate
+subtype applying to the block. Information about the block types is contained in
+the block data itself. A pointer to the newly created object is returned or one
+of the exception defined in class \verb|tape_block| is thrown.
+
+
+\subsection{Detailed documentation}
+\subsubsection{Doxygen}
+The source code has been documented using Doxygen and appropriate
+comments throughout the program code. Doxygen generates a very useful
+html documentation containing very usable diagrams (not strictly UML, but
+very fine anyway), lists and detailed documentation.
+
+The Doxygen configuration also creates man pages, latex sources with
+makefile for PostScript and PDF output.
+
+\subsubsection{Not in this document}
+I have decided not to create UML class and collaboration diagrams because
+in my opinion the Doxygen documentation perfectly covers those needs.
+
+The project already took several times the time I allocated in my schedule....
+
+\subsection{Building \pname}
\subsubsection{Build environment}
The program has been successfully built under Linux with the following
programs:
\begin{itemize}
-\item GCC version 4.1.2
-\item GNU make version 3.81
-\item Doxygen version 1.4.2
+\item GNU GCC, version 4.1.2
+\item GNU make, version 3.81
+\item Doxygen, version 1.4.2
\item Debian teTex package, version 3.0
-\item Graphviz dot version 2.8
+\item Graphviz dot tool, version 2.8
\end{itemize}
At least the the software (without docs) should be compile on any
POSIX compatible system with a fairly recent GCC and GNU make
process for the application and documentation. Changes may be
necessary to compile on a system other than stated in the last
paragraph.
-\\
To build the application, follow these easy steps:
\begin{itemize}
including binaries and documentation.
\end{itemize}
+
+% End of the show....
\ No newline at end of file
projects / h316.git / blobdiff