mirror of https://github.com/qpdf/qpdf.git
88 lines
2.5 KiB
C++
88 lines
2.5 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_FLATE_HH
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#define PL_FLATE_HH
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#include <qpdf/Pipeline.hh>
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#include <functional>
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class Pl_Flate: public Pipeline
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{
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public:
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static unsigned int const def_bufsize = 65536;
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static int compression_level;
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enum action_e { a_inflate, a_deflate };
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QPDF_DLL
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Pl_Flate(char const* identifier, Pipeline* next,
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action_e action, unsigned int out_bufsize = def_bufsize);
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QPDF_DLL
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virtual ~Pl_Flate();
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QPDF_DLL
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virtual void write(unsigned char* data, size_t len);
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QPDF_DLL
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virtual void finish();
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// Globally set compression level from 1 (fastest, least
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// compression) to 9 (slowest, most compression). Use -1 to set
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// the default compression level. This is passed directly to zlib.
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// This method returns a pointer to the current Pl_Flate object so
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// you can create a pipeline with
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// Pl_Flate(...)->setCompressionLevel(...)
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QPDF_DLL
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static void setCompressionLevel(int);
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QPDF_DLL
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void setWarnCallback(std::function<void(char const*, int)> callback);
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private:
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void handleData(unsigned char* data, size_t len, int flush);
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void checkError(char const* prefix, int error_code);
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void warn(char const*, int error_code);
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class Members
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{
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friend class Pl_Flate;
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public:
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QPDF_DLL
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~Members();
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private:
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Members(size_t out_bufsize, action_e action);
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Members(Members const&);
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PointerHolder<unsigned char> outbuf;
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size_t out_bufsize;
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action_e action;
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bool initialized;
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void* zdata;
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std::function<void(char const*, int)> callback;
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};
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PointerHolder<Members> m;
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};
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#endif // PL_FLATE_HH
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