1 files changed, 50 insertions, 0 deletions
diff --git a/src/libs/7zip/win/CPP/Common/DynamicBuffer.h b/src/libs/7zip/win/CPP/Common/DynamicBuffer.h
new file mode 100644
index 000000000..bf52a7425
--- /dev/null
+++ b/src/libs/7zip/win/CPP/Common/DynamicBuffer.h
@@ -0,0 +1,50 @@
+// Common/DynamicBuffer.h
+
+#ifndef __COMMON_DYNAMIC_BUFFER_H
+#define __COMMON_DYNAMIC_BUFFER_H
+
+#include "Buffer.h"
+
+template <class T> class CDynamicBuffer: public CBuffer<T>
+{
+  void GrowLength(size_t size)
+  {
+    size_t delta;
+    if (this->_capacity > 64)
+      delta = this->_capacity / 4;
+    else if (this->_capacity > 8)
+      delta = 16;
+    else
+      delta = 4;
+    delta = MyMax(delta, size);
+    size_t newCap = this->_capacity + delta;
+    if (newCap < delta)
+      newCap = this->_capacity + size;
+    SetCapacity(newCap);
+  }
+public:
+  CDynamicBuffer(): CBuffer<T>() {};
+  CDynamicBuffer(const CDynamicBuffer &buffer): CBuffer<T>(buffer) {};
+  CDynamicBuffer(size_t size): CBuffer<T>(size) {};
+  CDynamicBuffer& operator=(const CDynamicBuffer &buffer)
+  {
+    this->Free();
+    if (buffer._capacity > 0)
+    {
+      SetCapacity(buffer._capacity);
+      memmove(this->_items, buffer._items, buffer._capacity * sizeof(T));
+    }
+    return *this;
+  }
+  void EnsureCapacity(size_t capacity)
+  {
+    if (this->_capacity < capacity)
+      GrowLength(capacity - this->_capacity);
+  }
+};
+
+typedef CDynamicBuffer<char> CCharDynamicBuffer;
+typedef CDynamicBuffer<wchar_t> CWCharDynamicBuffer;
+typedef CDynamicBuffer<unsigned char> CByteDynamicBuffer;
+
+#endif