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qpdf/include/qpdf/Pl_RunLength.hh
2021-01-04 16:26:58 -05:00

72 lines
1.8 KiB
C++

// Copyright (c) 2005-2021 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 };
class Members
{
friend class Pl_RunLength;
public:
QPDF_DLL
~Members();
private:
Members(action_e);
Members(Members const&);
action_e action;
state_e state;
unsigned char buf[128];
unsigned int length;
};
PointerHolder<Members> m;
};
#endif // PL_RUNLENGTH_HH