More pubkey doc updates

1 files changed, 70 insertions, 0 deletions

diff --git a/doc/examples/hash_fd.cpp b/doc/examples/hash_fd.cpp
new file mode 100644
index 000000000..32acdbec3
--- /dev/null
+++ b/doc/examples/hash_fd.cpp
@@ -0,0 +1,70 @@
+/*
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+/*
+This is just like the normal hash application, but uses the Unix I/O
+system calls instead of C++ iostreams. Previously, this version was
+much faster and smaller, but GCC 3.1's libstdc++ seems to have been
+improved enough that the difference is now fairly minimal.
+
+Nicely enough, doing the change required changing only about 3 lines
+of code.
+*/
+
+#include <iostream>
+#include <botan/botan.h>
+
+#if !defined(BOTAN_HAS_PIPE_UNIXFD_IO)
+  #error "You didn't compile the pipe_unixfd module into Botan"
+#endif
+
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[])
+   {
+   if(argc < 3)
+      {
+      std::cout << "Usage: " << argv[0] << " digest <filenames>" << std::endl;
+      return 1;
+      }
+
+   Botan::LibraryInitializer init;
+
+   try
+      {
+      Botan::Pipe pipe(new Botan::Hash_Filter(argv[1]),
+                       new Botan::Hex_Encoder);
+
+      int skipped = 0;
+      for(int j = 2; argv[j] != 0; j++)
+         {
+         int file = open(argv[j], O_RDONLY);
+         if(file == -1)
+            {
+            std::cout << "ERROR: could not open " << argv[j] << std::endl;
+            skipped++;
+            continue;
+            }
+         pipe.start_msg();
+         file >> pipe;
+         pipe.end_msg();
+         close(file);
+         pipe.set_default_msg(j-2-skipped);
+         std::cout << pipe << "  " << argv[j] << std::endl;
+         }
+   }
+   catch(Botan::Algorithm_Not_Found)
+      {
+      std::cout << "Don't know about the hash function \"" << argv[1] << "\""
+                << std::endl;
+      }
+   catch(std::exception& e)
+      {
+      std::cout << "Exception caught: " << e.what() << std::endl;
+      }
+   return 0;
+   }