Buffer implementation

3 files changed, 60 insertions, 2 deletions

diff --git a/odb/buffer.cxx b/odb/buffer.cxx
new file mode 100644
index 0000000..f920258
--- /dev/null
+++ b/odb/buffer.cxx
@@ -0,0 +1,34 @@
+// file      : odb/buffer.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <cstring> // std::memcpy
+
+#include <odb/buffer.hxx>
+
+using namespace std;
+
+namespace odb
+{
+  void buffer::
+  capacity (size_t c, size_t data_size)
+  {
+    if (c > capacity_)
+    {
+      size_t n (capacity_ * 2 > c ? capacity_ * 2 : c);
+      char* d (static_cast<char*> (operator new (n)));
+
+      if (data_ != 0)
+      {
+        if (data_size != 0)
+          memcpy (d, data_, data_size);
+
+        operator delete (data_);
+      }
+
+      data_ = d;
+      capacity_ = n;
+    }
+  }
+}
diff --git a/odb/buffer.hxx b/odb/buffer.hxx
index 99482ae..2a07735 100644
--- a/odb/buffer.hxx
+++ b/odb/buffer.hxx
@@ -6,6 +6,7 @@
 #ifndef ODB_BUFFER_HXX
 #define ODB_BUFFER_HXX
 
+#include <new>
 #include <cstddef> // std::size_t
 
 namespace odb
@@ -13,10 +14,32 @@ namespace odb
   class buffer
   {
   public:
-    buffer ();
+    ~buffer ()
+    {
+      if (data_)
+        operator delete (data_);
+    }
+
+    buffer ()
+        : capacity_ (512)
+    {
+      data_ = static_cast<char*> (operator new (capacity_));
+    }
+
+    char*
+    data ()
+    {
+      return data_;
+    }
+
+    std::size_t
+    capacity () const
+    {
+      return capacity_;
+    }
 
     void
-    grow (std::size_t new_capacity, std::size_t data_size);
+    capacity (std::size_t, std::size_t data_size = 0);
 
   private:
     char* data_;
diff --git a/odb/makefile b/odb/makefile
index fdeb6ea..bae84e0 100644
--- a/odb/makefile
+++ b/odb/makefile
@@ -7,6 +7,7 @@ include $(dir $(lastword $(MAKEFILE_LIST)))../build/bootstrap.make
 
 cxx_tun   :=        \
 shared-ptr/base.cxx \
+buffer.cxx          \
 exception.cxx       \
 exceptions.cxx      \
 database.cxx        \