1 files changed, 77 insertions, 0 deletions
diff --git a/xfa/fxfa/xfa_checksum.h b/xfa/fxfa/xfa_checksum.h
new file mode 100644
index 0000000000..69adc0a023
--- /dev/null
+++ b/xfa/fxfa/xfa_checksum.h
@@ -0,0 +1,77 @@
+// 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 XFA_FXFA_XFA_CHECKSUM_H_
+#define XFA_FXFA_XFA_CHECKSUM_H_
+
+#include "xfa/fde/xml/cfx_saxreader.h"
+#include "xfa/fxfa/fxfa.h"
+
+class CXFA_SAXReaderHandler;
+class CXFA_ChecksumContext;
+
+class CXFA_SAXContext {
+ public:
+  CXFA_SAXContext() : m_eNode(CFX_SAXItem::Type::Unknown) {}
+
+  CFX_ByteTextBuf m_TextBuf;
+  CFX_ByteString m_bsTagName;
+  CFX_SAXItem::Type m_eNode;
+};
+
+class CXFA_SAXReaderHandler {
+ public:
+  CXFA_SAXReaderHandler(CXFA_ChecksumContext* pContext);
+  ~CXFA_SAXReaderHandler();
+
+  CXFA_SAXContext* OnTagEnter(const CFX_ByteStringC& bsTagName,
+                              CFX_SAXItem::Type eType,
+                              uint32_t dwStartPos);
+  void OnTagAttribute(CXFA_SAXContext* pTag,
+                      const CFX_ByteStringC& bsAttri,
+                      const CFX_ByteStringC& bsValue);
+  void OnTagBreak(CXFA_SAXContext* pTag);
+  void OnTagData(CXFA_SAXContext* pTag,
+                 CFX_SAXItem::Type eType,
+                 const CFX_ByteStringC& bsData,
+                 uint32_t dwStartPos);
+  void OnTagClose(CXFA_SAXContext* pTag, uint32_t dwEndPos);
+  void OnTagEnd(CXFA_SAXContext* pTag,
+                const CFX_ByteStringC& bsTagName,
+                uint32_t dwEndPos);
+
+  void OnTargetData(CXFA_SAXContext* pTag,
+                    CFX_SAXItem::Type eType,
+                    const CFX_ByteStringC& bsData,
+                    uint32_t dwStartPos);
+
+ protected:
+  void UpdateChecksum(FX_BOOL bCheckSpace);
+
+  CXFA_ChecksumContext* m_pContext;
+  CXFA_SAXContext m_SAXContext;
+};
+
+class CXFA_ChecksumContext {
+ public:
+  CXFA_ChecksumContext();
+  ~CXFA_ChecksumContext();
+
+  void StartChecksum();
+  void Update(const CFX_ByteStringC& bsText);
+  FX_BOOL UpdateChecksum(IFX_FileRead* pSrcFile,
+                         FX_FILESIZE offset = 0,
+                         size_t size = 0);
+  void FinishChecksum();
+  CFX_ByteString GetChecksum() const;
+
+ protected:
+  CFX_SAXReader* m_pSAXReader;
+  uint8_t* m_pByteContext;
+  CFX_ByteString m_bsChecksum;
+};
+
+#endif  // XFA_FXFA_XFA_CHECKSUM_H_