Factor out common buffer implementation

1 files changed, 89 insertions, 0 deletions

diff --git a/libcommon/common/buffer.hxx b/libcommon/common/buffer.hxx
new file mode 100644
index 0000000..97e8962
--- /dev/null
+++ b/libcommon/common/buffer.hxx
@@ -0,0 +1,89 @@
+// file      : libcommon/common/buffer.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef LIBCOMMON_COMMON_BUFFER_HXX
+#define LIBCOMMON_COMMON_BUFFER_HXX
+
+#include <cstddef> // std::size_t
+#include <cstring> // std::{memcmp,memcpy}
+
+struct buffer
+{
+  ~buffer ()
+  {
+    delete[] data_;
+  }
+
+  buffer ()
+      : data_ (0), size_ (0)
+  {
+  }
+
+  buffer (const void* data, std::size_t size)
+      : data_ (0), size_ (size)
+  {
+    data_ = new char[size_];
+    std::memcpy (data_, data, size_);
+  }
+
+  buffer (const buffer& y)
+      : data_ (0), size_ (0)
+  {
+    assign (y.data_, y.size_);
+  }
+
+  buffer&
+  operator= (const buffer& y)
+  {
+    if (this != &y)
+      assign (y.data_, y.size_);
+
+    return *this;
+  }
+
+  void
+  assign (const void* data, std::size_t size)
+  {
+    if (size_ < size)
+    {
+      char* p (new char[size]);
+      delete[] data_;
+      data_ = p;
+    }
+
+    std::memcpy (data_, data, size);
+    size_ = size;
+  }
+
+  char*
+  data ()
+  {
+    return data_;
+  }
+
+  const char*
+  data () const
+  {
+    return data_;
+  }
+
+  std::size_t
+  size () const
+  {
+    return size_;
+  }
+
+  bool
+  operator== (const buffer& y) const
+  {
+    return size_ == y.size_ && std::memcmp (data_, y.data_, size_) == 0;
+  }
+
+private:
+  char* data_;
+  std::size_t size_;
+};
+
+#endif // LIBCOMMON_COMMON_BUFFER_HXX