Implement progress output

GCryptCLI/include/DataIngestionLayer.h

@@ -35,6 +35,9 @@ namespace IO {
       //! Returns true, if EOF is reached, and there are no more blocks to fetch (GetNextBlock())
       static bool IsFinished();
 
+      //! Returns how many blocks have been read, in total
+      static std::size_t NBlocksRead();
+
     private:
       static std::istream* in;
 
@@ -57,6 +60,9 @@ namespace IO {
       // Are we reading ciphertext or regular text?
       static bool isReadingCiphertext;
 
+      // How many blocks have been read in total
+      static std::size_t nBlocksRead;
+
       // All read blocks, that haven't been given out yet
       static std::queue<Block> blocks;
 

GCryptCLI/include/ProgressPrinter.h

@@ -0,0 +1,23 @@
+#ifndef GCRYPTCLI_PROGRESSPRINTER_H
+#define GCRYPTCLI_PROGRESSPRINTER_H
+
+#include <iostream>
+#include "CommandlineInterface.h"
+
+// This class has the task to output progress to stderr, if requested
+class ProgressPrinter {
+  public:
+    //! Will print progress to stderr, if requested, and the interval matches
+    static void PrintIfAppropriate(
+      const std::string& message,
+      const std::size_t current,
+      const std::size_t target
+    );
+
+  private:
+    // No instanciation! >:(
+    ProgressPrinter() {};
+};
+
+#endif
+

GCryptCLI/include/Version.h

@@ -1,7 +1,7 @@
 #ifndef GCRYPTCLI_VERSION_H
 #define GCRYPTCLI_VERSION_H
 
-#define GCRYPTCLI_VERSION 0.125
+#define GCRYPTCLI_VERSION 0.1251
 
 #endif