File: Pl_RunLength.hh

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// Copyright (c) 2005-2018 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.

#ifndef __PL_RUNLENGTH_HH__
#define __PL_RUNLENGTH_HH__

#include <qpdf/Pipeline.hh>

class Pl_RunLength: public Pipeline
{
  public:
    enum action_e { a_encode, a_decode };

    QPDF_DLL
    Pl_RunLength(char const* identifier, Pipeline* next,
                 action_e action);
    QPDF_DLL
    virtual ~Pl_RunLength();

    QPDF_DLL
    virtual void write(unsigned char* data, size_t len);
    QPDF_DLL
    virtual void finish();

  private:
    void encode(unsigned char* data, size_t len);
    void decode(unsigned char* data, size_t len);
    void flush_encode();

    enum state_e { st_top, st_copying, st_run };

    action_e action;
    state_e state;
    unsigned char buf[128];
    unsigned int length;
};

#endif // __PL_RUNLENGTH_HH__