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Run this: for i in **/*.cc **/*.c **/*.h **/*.hh; do clang-format < $i >| $i.new && mv $i.new $i done
79 lines
3.0 KiB
C++
79 lines
3.0 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 QPDFSTREAMFILTER_HH
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#define QPDFSTREAMFILTER_HH
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#include <qpdf/DLL.h>
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#include <qpdf/Pipeline.hh>
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#include <qpdf/QPDFObjectHandle.hh>
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class QPDF_DLL_CLASS QPDFStreamFilter
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{
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public:
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QPDF_DLL
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QPDFStreamFilter() = default;
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QPDF_DLL
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virtual ~QPDFStreamFilter() = default;
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// A QPDFStreamFilter class must implement, at a minimum,
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// setDecodeParms() and getDecodePipeline(). QPDF will always call
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// setDecodeParms() before calling getDecodePipeline(). It is
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// expected that you will store any needed information from
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// decode_parms (or the decode_parms object itself) in your
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// instance so that it can be used to construct the decode
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// pipeline.
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// Return a boolean indicating whether your filter can proceed
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// with the given /DecodeParms. The default implementation accepts
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// a null object and rejects everything else.
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QPDF_DLL
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virtual bool setDecodeParms(QPDFObjectHandle decode_parms);
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// Return a pipeline that will decode data encoded with your
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// filter. Your implementation must ensure that the pipeline is
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// deleted when the instance of your class is destroyed.
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QPDF_DLL
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virtual Pipeline* getDecodePipeline(Pipeline* next) = 0;
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// If your filter implements "specialized" compression or lossy
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// compression, override one or both of these methods. The default
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// implementations return false. See comments in QPDFWriter for
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// details. QPDF defines specialized compression as non-lossy
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// compression not intended for general-purpose data. qpdf, by
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// default, doesn't mess with streams that are compressed with
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// specialized compression, the idea being that the decision to
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// use that compression scheme would fall outside of what
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// QPDFWriter would know anything about, so any attempt to decode
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// and re-encode would probably be undesirable.
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QPDF_DLL
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virtual bool isSpecializedCompression();
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QPDF_DLL
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virtual bool isLossyCompression();
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private:
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QPDFStreamFilter(QPDFStreamFilter const&) = delete;
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QPDFStreamFilter& operator=(QPDFStreamFilter const&) = delete;
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};
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#endif // QPDFSTREAMFILTER_HH
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