New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/drape/buffer_base.cpp

@@ -0,0 +1,58 @@
+#include "drape/buffer_base.hpp"
+#include "base/assert.hpp"
+
+namespace dp
+{
+
+BufferBase::BufferBase(uint8_t elementSize, uint32_t capacity)
+  : m_elementSize(elementSize)
+  , m_capacity(capacity)
+  , m_size(0)
+{
+}
+
+uint32_t BufferBase::GetCapacity() const
+{
+  return m_capacity;
+}
+
+uint32_t BufferBase::GetCurrentSize() const
+{
+  return m_size;
+}
+
+uint32_t BufferBase::GetAvailableSize() const
+{
+  return m_capacity - m_size;
+}
+
+void BufferBase::Resize(uint32_t elementCount)
+{
+  m_capacity = elementCount;
+  m_size = 0;
+}
+
+uint8_t BufferBase::GetElementSize() const
+{
+  return m_elementSize;
+}
+
+void BufferBase::Seek(uint32_t elementNumber)
+{
+  ASSERT(elementNumber <= m_capacity, ());
+  m_size = elementNumber;
+}
+
+void BufferBase::UploadData(uint32_t elementCount)
+{
+  ASSERT(m_size + elementCount <= m_capacity, ());
+  m_size += elementCount;
+}
+
+void BufferBase::SetDataSize(uint32_t elementCount)
+{
+  ASSERT(elementCount <= m_capacity, ());
+  m_size = elementCount;
+}
+
+} // namespace dp