Split CFX_FixedBufGrow out of fx_basicchromium/3201

This CL moves CFX_FixedBufGrow to its own files and updates includes as
needed.

Change-Id: Ia0cb70569b30acdb3ba9f23d8937ab8f9c17d6e6
Reviewed-on: https://pdfium-review.googlesource.com/12490
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/core/fxcrt/cfx_fixedbufgrow.h b/core/fxcrt/cfx_fixedbufgrow.h
new file mode 100644
index 0000000000..b12b710473
--- /dev/null
+++ b/core/fxcrt/cfx_fixedbufgrow.h
@@ -0,0 +1,31 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCRT_CFX_FIXEDBUFGROW_H_
+#define CORE_FXCRT_CFX_FIXEDBUFGROW_H_
+
+#include <memory>
+
+#include "core/fxcrt/fx_memory.h"
+
+template <class DataType, int FixedSize>
+class CFX_FixedBufGrow {
+ public:
+  explicit CFX_FixedBufGrow(int data_size) {
+    if (data_size > FixedSize) {
+      m_pGrowData.reset(FX_Alloc(DataType, data_size));
+      return;
+    }
+    memset(m_FixedData, 0, sizeof(DataType) * FixedSize);
+  }
+  operator DataType*() { return m_pGrowData ? m_pGrowData.get() : m_FixedData; }
+
+ private:
+  DataType m_FixedData[FixedSize];
+  std::unique_ptr<DataType, FxFreeDeleter> m_pGrowData;
+};
+
+#endif  // CORE_FXCRT_CFX_FIXEDBUFGROW_H_