refactor: combined ZoneOutputStream interface with impl

src/ZoneWriting/Zone/Stream/InMemoryZoneData.cpp

@@ -0,0 +1,38 @@
+#include "InMemoryZoneData.h"
+
+#include <stdexcept>
+
+InMemoryZoneData::InMemoryZoneData()
+    : m_total_size(0)
+{
+    m_buffers.emplace_back(BUFFER_SIZE);
+}
+
+InMemoryZoneData::MemoryBuffer::MemoryBuffer(const size_t size)
+    : m_data(std::make_unique<char[]>(size)),
+      m_size(0)
+{
+    if (!m_data)
+        throw std::runtime_error("Failed to allocate memory for memory buffer.");
+}
+
+void* InMemoryZoneData::GetBufferOfSize(const size_t size)
+{
+    if (size > BUFFER_SIZE)
+    {
+        m_buffers.emplace_back(size);
+    }
+    else
+    {
+        if (m_buffers.back().m_size + size > BUFFER_SIZE)
+        {
+            m_buffers.emplace_back(BUFFER_SIZE);
+        }
+    }
+
+    auto& backBuffer = m_buffers.back();
+    void* result = &backBuffer.m_data[backBuffer.m_size];
+    backBuffer.m_size += size;
+    m_total_size += size;
+    return result;
+}