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96 lines
2.9 KiB
C++
96 lines
2.9 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 QPDF_CLOSEDFILEINPUTSOURCE_HH
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#define QPDF_CLOSEDFILEINPUTSOURCE_HH
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// This is an input source that reads from files, like
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// FileInputSource, except that it opens and close the file
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// surrounding every operation. This decreases efficiency, but it allows
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// many more of these to exist at once than the maximum number of open
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// file descriptors. This is used for merging large numbers of files.
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#include <qpdf/InputSource.hh>
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#include <qpdf/PointerHolder.hh>
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#include <memory>
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class FileInputSource;
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class QPDF_DLL_CLASS ClosedFileInputSource: public InputSource
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{
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public:
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QPDF_DLL
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ClosedFileInputSource(char const* filename);
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QPDF_DLL
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virtual ~ClosedFileInputSource();
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QPDF_DLL
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virtual qpdf_offset_t findAndSkipNextEOL();
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QPDF_DLL
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virtual std::string const& getName() const;
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QPDF_DLL
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virtual qpdf_offset_t tell();
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QPDF_DLL
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virtual void seek(qpdf_offset_t offset, int whence);
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QPDF_DLL
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virtual void rewind();
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QPDF_DLL
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virtual size_t read(char* buffer, size_t length);
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QPDF_DLL
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virtual void unreadCh(char ch);
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// The file stays open between calls to stayOpen(true) and
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// stayOpen(false). You can use this to surround multiple
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// operations on a single ClosedFileInputSource to reduce the
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// overhead of a separate open/close on each call.
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QPDF_DLL
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void stayOpen(bool);
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private:
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ClosedFileInputSource(ClosedFileInputSource const&) = delete;
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ClosedFileInputSource& operator=(ClosedFileInputSource const&) = delete;
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QPDF_DLL_PRIVATE
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void before();
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QPDF_DLL_PRIVATE
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void after();
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class QPDF_DLL_PRIVATE Members
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{
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friend class ClosedFileInputSource;
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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(char const* filename);
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std::string filename;
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qpdf_offset_t offset;
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std::shared_ptr<FileInputSource> fis;
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bool stay_open;
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};
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std::shared_ptr<Members> m;
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};
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#endif // QPDF_CLOSEDFILEINPUTSOURCE_HH
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