Move CPDFSDK_MemoryAccess to fxcrt.

Rename it CFX_ReadOnlyMemoryStream and swap out one use of CFX_MemoryStream.

BUG=pdfium:263

Change-Id: I15012df156a6a4d7c36f6fd58f32c355eae5fa1a
Reviewed-on: https://pdfium-review.googlesource.com/39878
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/core/fxcrt/cfx_readonlymemorystream.h b/core/fxcrt/cfx_readonlymemorystream.h
new file mode 100644
index 0000000000..e9d18222a4
--- /dev/null
+++ b/core/fxcrt/cfx_readonlymemorystream.h
@@ -0,0 +1,30 @@
+// Copyright 2018 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_READONLYMEMORYSTREAM_H_
+#define CORE_FXCRT_CFX_READONLYMEMORYSTREAM_H_
+
+#include "core/fxcrt/fx_stream.h"
+#include "core/fxcrt/retain_ptr.h"
+
+class CFX_ReadOnlyMemoryStream final : public IFX_SeekableReadStream {
+ public:
+  template <typename T, typename... Args>
+  friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+  // IFX_SeekableReadStream:
+  FX_FILESIZE GetSize() override;
+  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+
+ private:
+  CFX_ReadOnlyMemoryStream(const uint8_t* pBuf, FX_FILESIZE size);
+  ~CFX_ReadOnlyMemoryStream() override;
+
+  const uint8_t* const m_pBuf;
+  const FX_FILESIZE m_size;
+};
+
+#endif  // CORE_FXCRT_CFX_READONLYMEMORYSTREAM_H_