1 files changed, 72 insertions, 0 deletions
diff --git a/botan/doc/examples/hasher2.cpp b/botan/doc/examples/hasher2.cpp
new file mode 100644
index 0000000..12d3c85
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+++ b/botan/doc/examples/hasher2.cpp
@@ -0,0 +1,72 @@
+/*
+Identical to hasher.cpp, but uses Pipe in a different way.
+
+Note this tends to be much less efficient than hasher.cpp, because it does
+three passes over the file. For a small file, it doesn't really matter. But for
+a large file, or for something you can't re-read easily (socket, stdin, ...)
+this is a bad idea.
+
+Written by Jack Lloyd (lloyd@randombit.net), Feb 8 2001
+
+This file is in the public domain
+*/
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <botan/botan.h>
+
+int main(int argc, char* argv[])
+   {
+   if(argc < 2)
+      {
+      std::cout << "Usage: " << argv[0] << " <filenames>" << std::endl;
+      return 1;
+      }
+
+   Botan::LibraryInitializer init;
+
+   const int COUNT = 3;
+   std::string name[COUNT] = { "MD5", "SHA-1", "RIPEMD-160" };
+
+   Botan::Pipe pipe;
+
+   int skipped = 0;
+   for(int j = 1; argv[j] != 0; j++)
+      {
+      Botan::Filter* hash[COUNT] = {
+         new Botan::Hash_Filter(name[0]),
+         new Botan::Hash_Filter(name[1]),
+         new Botan::Hash_Filter(name[2]),
+      };
+
+      std::ifstream file(argv[j]);
+      if(!file)
+         {
+         std::cout << "ERROR: could not open " << argv[j] << std::endl;
+         skipped++;
+         continue;
+         }
+      for(int k = 0; k != COUNT; k++)
+         {
+         pipe.reset();
+         pipe.append(hash[k]);
+         pipe.append(new Botan::Hex_Encoder);
+         pipe.start_msg();
+
+         // trickiness: the >> op reads until EOF, but seekg won't work
+         // unless we're in the "good" state (which EOF is not).
+         file.clear();
+         file.seekg(0, std::ios::beg);
+         file >> pipe;
+         pipe.end_msg();
+         }
+      file.close();
+      for(int k = 0; k != COUNT; k++)
+         {
+         std::string out = pipe.read_all_as_string(COUNT*(j-1-skipped) + k);
+         std::cout << name[k] << "(" << argv[j] << ") = " << out << std::endl;
+         }
+      }
+
+   return 0;
+   }