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-rw-r--r--core/fxcrt/cfx_readonlymemorystream.cpp34
-rw-r--r--core/fxcrt/cfx_readonlymemorystream.h30
2 files changed, 64 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_readonlymemorystream.cpp b/core/fxcrt/cfx_readonlymemorystream.cpp
new file mode 100644
index 0000000000..1d09759208
--- /dev/null
+++ b/core/fxcrt/cfx_readonlymemorystream.cpp
@@ -0,0 +1,34 @@
+// 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
+
+#include "core/fxcrt/cfx_readonlymemorystream.h"
+
+#include "core/fxcrt/fx_safe_types.h"
+
+CFX_ReadOnlyMemoryStream::CFX_ReadOnlyMemoryStream(const uint8_t* pBuf,
+ FX_FILESIZE size)
+ : m_pBuf(pBuf), m_size(size) {}
+
+CFX_ReadOnlyMemoryStream::~CFX_ReadOnlyMemoryStream() = default;
+
+FX_FILESIZE CFX_ReadOnlyMemoryStream::GetSize() {
+ return m_size;
+}
+
+bool CFX_ReadOnlyMemoryStream::ReadBlock(void* buffer,
+ FX_FILESIZE offset,
+ size_t size) {
+ if (offset < 0)
+ return false;
+
+ FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
+ newPos += offset;
+ if (!newPos.IsValid() || newPos.ValueOrDie() > m_size)
+ return false;
+
+ memcpy(buffer, m_pBuf + offset, size);
+ return true;
+}
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_