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74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef PL_RUNLENGTH_HH
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#define PL_RUNLENGTH_HH
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#include <qpdf/Pipeline.hh>
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class QPDF_DLL_CLASS Pl_RunLength: public Pipeline
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{
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public:
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enum action_e { a_encode, a_decode };
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QPDF_DLL
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Pl_RunLength(char const* identifier, Pipeline* next, action_e action);
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QPDF_DLL
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virtual ~Pl_RunLength();
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QPDF_DLL
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virtual void write(unsigned char const* data, size_t len);
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QPDF_DLL
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virtual void finish();
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private:
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QPDF_DLL_PRIVATE
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void encode(unsigned char const* data, size_t len);
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QPDF_DLL_PRIVATE
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void decode(unsigned char const* data, size_t len);
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QPDF_DLL_PRIVATE
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void flush_encode();
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enum state_e { st_top, st_copying, st_run };
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class QPDF_DLL_PRIVATE Members
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{
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friend class Pl_RunLength;
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public:
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QPDF_DLL
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~Members() = default;
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private:
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Members(action_e);
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Members(Members const&) = delete;
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action_e action;
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state_e state;
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unsigned char buf[128];
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unsigned int length;
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};
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std::shared_ptr<Members> m;
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};
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#endif // PL_RUNLENGTH_HH
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