BC_C40Encoder.h

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// Copyright 2014 The PDFium Authors
// 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 FXBARCODE_DATAMATRIX_BC_C40ENCODER_H_
#define FXBARCODE_DATAMATRIX_BC_C40ENCODER_H_
 
#include "core/fxcrt/widestring.h"
#include "fxbarcode/datamatrix/BC_Encoder.h"
 
class CBC_C40Encoder : public CBC_Encoder {
 public:
  CBC_C40Encoder();
  ~CBC_C40Encoder() override;
 
  // CBC_Encoder
  CBC_HighLevelEncoder::Encoding GetEncodingMode() override;
  bool Encode(CBC_EncoderContext* context) override;
 
  static void WriteNextTriplet(CBC_EncoderContext* context, WideString* buffer);
 
  virtual bool HandleEOD(CBC_EncoderContext* context, WideString* buffer);
 
  // Returns the number of characters appended to |sb|, or 0 on failure.
  virtual int32_t EncodeChar(wchar_t c, WideString* sb);
 
 private:
  // Moves back by 1 position in |context| and adjusts |buffer| accordingly
  // using |lastCharSize|. Returns the length of the current character in
  // |context| after adjusting the position. If the character cannot be encoded,
  // return -1.
  int32_t BacktrackOneCharacter(CBC_EncoderContext* context,
                                WideString* buffer,
                                int32_t lastCharSize);
};
 
#endif  // FXBARCODE_DATAMATRIX_BC_C40ENCODER_H_