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-rw-r--r--libcommon/buffer.hxx104
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diff --git a/libcommon/buffer.hxx b/libcommon/buffer.hxx
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+// file : libcommon/buffer.hxx
+// license : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef LIBCOMMON_BUFFER_HXX
+#define LIBCOMMON_BUFFER_HXX
+
+#include <new>
+#include <cstddef> // std::size_t
+#include <cstring> // std::{memcmp,memcpy}
+
+struct basic_buffer_base
+{
+ ~basic_buffer_base ()
+ {
+ operator delete (data_);
+ }
+
+ basic_buffer_base ()
+ : data_ (0), size_ (0)
+ {
+ }
+
+ basic_buffer_base (const void* data, std::size_t size)
+ : data_ (0), size_ (size)
+ {
+ data_ = operator new (size_);
+ std::memcpy (data_, data, size_);
+ }
+
+ basic_buffer_base (const basic_buffer_base& y)
+ : data_ (0), size_ (0)
+ {
+ assign (y.data_, y.size_);
+ }
+
+ basic_buffer_base&
+ operator= (const basic_buffer_base& y)
+ {
+ if (this != &y)
+ assign (y.data_, y.size_);
+
+ return *this;
+ }
+
+ void
+ assign (const void* data, std::size_t size)
+ {
+ if (size_ < size)
+ {
+ void *p (operator new (size));
+ operator delete (data_);
+ data_ = p;
+ }
+
+ std::memcpy (data_, data, size);
+ size_ = size;
+ }
+
+ std::size_t
+ size () const
+ {
+ return size_;
+ }
+
+ bool
+ operator== (const basic_buffer_base& y) const
+ {
+ return size_ == y.size_ && std::memcmp (data_, y.data_, size_) == 0;
+ }
+
+protected:
+ void* data_;
+ std::size_t size_;
+};
+
+template <typename T>
+struct basic_buffer: basic_buffer_base
+{
+ basic_buffer ()
+ {
+ }
+
+ basic_buffer (const T* data, std::size_t size)
+ : basic_buffer_base (data, size)
+ {
+ }
+
+ T*
+ data ()
+ {
+ return static_cast<T*> (data_);
+ }
+
+ const T*
+ data () const
+ {
+ return static_cast<const T*> (data_);
+ }
+};
+
+typedef basic_buffer<char> buffer;
+typedef basic_buffer<unsigned char> ubuffer;
+
+#endif // LIBCOMMON_BUFFER_HXX