mirror of https://github.com/qpdf/qpdf.git
78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
// Copyright (c) 2005-2024 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"); you may not use this file except
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// in compliance with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under
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// the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
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// License. At your option, you may continue to consider qpdf to be licensed under those terms.
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// Please 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 FileInputSource, except that it opens and
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// closes the file surrounding every operation. This decreases efficiency, but it allows many more
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// of these to exist at once than the maximum number of open file descriptors. This is used for
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// merging large numbers of files.
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#include <qpdf/InputSource.hh>
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#include <qpdf/PointerHolder.hh> // unused -- remove in qpdf 12 (see #785)
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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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~ClosedFileInputSource() override;
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QPDF_DLL
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qpdf_offset_t findAndSkipNextEOL() override;
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QPDF_DLL
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std::string const& getName() const override;
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QPDF_DLL
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qpdf_offset_t tell() override;
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QPDF_DLL
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void seek(qpdf_offset_t offset, int whence) override;
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QPDF_DLL
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void rewind() override;
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QPDF_DLL
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size_t read(char* buffer, size_t length) override;
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QPDF_DLL
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void unreadCh(char ch) override;
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// The file stays open between calls to stayOpen(true) and stayOpen(false). You can use this to
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// surround multiple operations on a single ClosedFileInputSource to reduce the overhead of a
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// 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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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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#endif // QPDF_CLOSEDFILEINPUTSOURCE_HH
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