Add a generalized Buffered_Operation. Relies on tr1 for sane callbacks

(std::tr1::function).

1 files changed, 45 insertions, 0 deletions

diff --git a/src/utils/buf_op/buf_op.h b/src/utils/buf_op/buf_op.h
new file mode 100644
index 000000000..cc864c47d
--- /dev/null
+++ b/src/utils/buf_op/buf_op.h
@@ -0,0 +1,45 @@
+/**
+* Buffering Central
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_BUFFERED_OPTION_H__
+#define BOTAN_BUFFERED_OPTION_H__
+
+#include <botan/types.h>
+#include <tr1/functional>
+#include <vector>
+
+namespace Botan {
+
+class BOTAN_DLL Buffered_Operation
+   {
+   public:
+      typedef std::tr1::function<void (const byte[], size_t)> callback_fn;
+
+      void write(const byte input[], size_t input_size);
+
+      void final();
+
+      void reset();
+
+      size_t current_position() const { return buffer_pos; }
+
+      Buffered_Operation(callback_fn main_block,
+                         callback_fn final_block,
+                         size_t main_buf_mod,
+                         size_t final_minimum = 0);
+
+   private:
+      callback_fn main_fn, final_fn;
+      size_t final_minimum, main_block_mod;
+
+      std::vector<byte> buffer;
+      size_t buffer_pos;
+   };
+
+}
+
+#endif