diff --git a/src/chunkedbuffer.cpp b/src/chunkedbuffer.cpp
new file mode 100644
--- /dev/null
+++ b/src/chunkedbuffer.cpp
@@ -0,0 +1,88 @@
+/*
+  Copyright © 2017 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "chunkedbuffer.h"
+
+ChunkedBuffer::ChunkedBuffer()
+{
+    numChunks = 0;
+    _size = 0;
+
+    // create first chunk
+    addChunk();
+}
+
+~ChunkedBuffer::ChunkedBuffer()
+{
+    for (auto chunk : chunks)
+    {
+        delete chunk;
+    }
+}
+
+void ChunkedBuffer::addSamples(double* samples, size_t size)
+{
+    size_t i = 0;
+
+    while (i < size)
+    {
+        // select chunk to add data
+        auto chunk = chunk->last();
+        if (chunk->isFull())
+        {
+            chunk = addChunk(); // create a new chunk
+        }
+
+        // add data to chunk
+        size_t c = std::min(chunk->left(), (size - i));
+        chunk->addSamples(&samples[i], c);
+        i += c;
+    }
+
+    _size += size;
+}
+
+DataChunk* ChunkedBuffer::addChunk()
+{
+    auto chunk = new DataChunk(_size, CHUNK_SIZE);
+    chunks.append(chunk);
+    return chunk;
+}
+
+size_t ChunkedBuffer::size() const
+{
+    return _size;
+}
+
+QRectF ChunkedBuffer::boundingRect() const
+{
+    // TODO: it should be possible to cache boundingRect and only
+    // update on 'addSamples' and when dropping chunks
+
+    // find ymin and ymax
+    ymin = chunks->first().min();
+    ymax = chunks->first().max();
+    for (auto c : chunks)
+    {
+        ymin = std::min(ymin, c->min());
+        ymax = std::max(ymax, c->max());
+    }
+
+    return QRectF(0, ymax, _size, (ymax-ymin));
+}