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-rw-r--r--core/fxcrt/cfx_memorystream.h56
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diff --git a/core/fxcrt/cfx_memorystream.h b/core/fxcrt/cfx_memorystream.h
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+++ b/core/fxcrt/cfx_memorystream.h
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+// 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_MEMORYSTREAM_H_
+#define CORE_FXCRT_CFX_MEMORYSTREAM_H_
+
+#include <vector>
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxcrt/fx_stream.h"
+
+class CFX_MemoryStream : public IFX_SeekableStream {
+ public:
+ enum Type { kConsecutive = 1 << 0, kTakeOver = 1 << 1 };
+
+ template <typename T, typename... Args>
+ friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+ // IFX_SeekableStream
+ FX_FILESIZE GetSize() override;
+ FX_FILESIZE GetPosition() override;
+ bool IsEOF() override;
+ bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+ size_t ReadBlock(void* buffer, size_t size) override;
+ bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
+ bool Flush() override;
+
+ bool IsConsecutive() const { return !!(m_dwFlags & Type::kConsecutive); }
+
+ uint8_t* GetBuffer() const {
+ return !m_Blocks.empty() ? m_Blocks.front() : nullptr;
+ }
+
+ void EstimateSize(size_t nInitSize, size_t nGrowSize);
+ void AttachBuffer(uint8_t* pBuffer, size_t nSize);
+ void DetachBuffer();
+
+ private:
+ explicit CFX_MemoryStream(bool bConsecutive);
+ CFX_MemoryStream(uint8_t* pBuffer, size_t nSize, bool bTakeOver);
+ ~CFX_MemoryStream() override;
+
+ bool ExpandBlocks(size_t size);
+
+ std::vector<uint8_t*> m_Blocks;
+ size_t m_nTotalSize;
+ size_t m_nCurSize;
+ size_t m_nCurPos;
+ size_t m_nGrowSize;
+ uint32_t m_dwFlags;
+};
+
+#endif // CORE_FXCRT_CFX_MEMORYSTREAM_H_