xfa/fxfa/include/xfa_checksum.h

// 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_INCLUDE_XFA_CHECKSUM_H_
#define XFA_FXFA_INCLUDE_XFA_CHECKSUM_H_

#include "xfa/fgas/xml/fgas_sax.h"
#include "xfa/fxfa/include/fxfa.h"

class CXFA_SAXReaderHandler;
class CXFA_ChecksumContext;

class CXFA_SAXContext {
 public:
  CXFA_SAXContext() : m_eNode(FX_SAXNODE_Unknown) {}
  CFX_ByteTextBuf m_TextBuf;
  CFX_ByteString m_bsTagName;
  FX_SAXNODE m_eNode;
};
class CXFA_SAXReaderHandler : public IFX_SAXReaderHandler {
 public:
  CXFA_SAXReaderHandler(CXFA_ChecksumContext* pContext);
  virtual ~CXFA_SAXReaderHandler();
  virtual void* OnTagEnter(const CFX_ByteStringC& bsTagName,
                           FX_SAXNODE eType,
                           uint32_t dwStartPos);
  virtual void OnTagAttribute(void* pTag,
                              const CFX_ByteStringC& bsAttri,
                              const CFX_ByteStringC& bsValue);
  virtual void OnTagBreak(void* pTag);
  virtual void OnTagData(void* pTag,
                         FX_SAXNODE eType,
                         const CFX_ByteStringC& bsData,
                         uint32_t dwStartPos);
  virtual void OnTagClose(void* pTag, uint32_t dwEndPos);
  virtual void OnTagEnd(void* pTag,
                        const CFX_ByteStringC& bsTagName,
                        uint32_t dwEndPos);

  virtual void OnTargetData(void* pTag,
                            FX_SAXNODE 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 Release() { delete this; }
  FX_BOOL StartChecksum();
  FX_BOOL UpdateChecksum(IFX_FileRead* pSrcFile,
                         FX_FILESIZE offset = 0,
                         size_t size = 0);
  void FinishChecksum();
  void GetChecksum(CFX_ByteString& bsChecksum);
  void Update(const CFX_ByteStringC& bsText);

 protected:
  IFX_SAXReader* m_pSAXReader;
  uint8_t* m_pByteContext;
  CFX_ByteString m_bsChecksum;
};

#endif  // XFA_FXFA_INCLUDE_XFA_CHECKSUM_H_