1 files changed, 34 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_checksumcontext.h b/core/fxcrt/cfx_checksumcontext.h
new file mode 100644
index 0000000000..8869c540fb
--- /dev/null
+++ b/core/fxcrt/cfx_checksumcontext.h
@@ -0,0 +1,34 @@
+// Copyright 2014 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_CHECKSUMCONTEXT_H_
+#define CORE_FXCRT_CFX_CHECKSUMCONTEXT_H_
+
+#include <memory>
+
+#include "core/fdrm/crypto/fx_crypt.h"
+#include "core/fxcrt/xml/cfx_saxreader.h"
+
+class CFX_ChecksumContext {
+ public:
+  CFX_ChecksumContext();
+  ~CFX_ChecksumContext();
+
+  void StartChecksum();
+  void Update(const CFX_ByteStringC& bsText);
+  bool UpdateChecksum(const CFX_RetainPtr<IFX_SeekableReadStream>& pSrcFile,
+                      FX_FILESIZE offset = 0,
+                      size_t size = 0);
+  void FinishChecksum();
+  CFX_ByteString GetChecksum() const;
+
+ private:
+  std::unique_ptr<CFX_SAXReader> m_pSAXReader;
+  std::unique_ptr<CRYPT_sha1_context> m_pByteContext;
+  CFX_ByteString m_bsChecksum;
+};
+
+#endif  // CORE_FXCRT_CFX_CHECKSUMCONTEXT_H_