mirror of https://github.com/qpdf/qpdf.git
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
|
|
//
|
|
// This file is part of qpdf.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// Versions of qpdf prior to version 7 were released under the terms
|
|
// of version 2.0 of the Artistic License. At your option, you may
|
|
// continue to consider qpdf to be licensed under those terms. Please
|
|
// see the manual for additional information.
|
|
|
|
#ifndef QPDF_CLOSEDFILEINPUTSOURCE_HH
|
|
#define QPDF_CLOSEDFILEINPUTSOURCE_HH
|
|
|
|
// This is an input source that reads from files, like
|
|
// FileInputSource, except that it opens and close the file
|
|
// surrounding every operation. This decreases efficiency, but it allows
|
|
// many more of these to exist at once than the maximum number of open
|
|
// file descriptors. This is used for merging large numbers of files.
|
|
|
|
#include <qpdf/InputSource.hh>
|
|
#include <qpdf/PointerHolder.hh>
|
|
|
|
class FileInputSource;
|
|
|
|
class ClosedFileInputSource: public InputSource
|
|
{
|
|
public:
|
|
QPDF_DLL
|
|
ClosedFileInputSource(char const* filename);
|
|
QPDF_DLL
|
|
virtual ~ClosedFileInputSource();
|
|
QPDF_DLL
|
|
virtual qpdf_offset_t findAndSkipNextEOL();
|
|
QPDF_DLL
|
|
virtual std::string const& getName() const;
|
|
QPDF_DLL
|
|
virtual qpdf_offset_t tell();
|
|
QPDF_DLL
|
|
virtual void seek(qpdf_offset_t offset, int whence);
|
|
QPDF_DLL
|
|
virtual void rewind();
|
|
QPDF_DLL
|
|
virtual size_t read(char* buffer, size_t length);
|
|
QPDF_DLL
|
|
virtual void unreadCh(char ch);
|
|
|
|
// The file stays open between calls to stayOpen(true) and
|
|
// stayOpen(false). You can use this to surround multiple
|
|
// operations on a single ClosedFileInputSource to reduce the
|
|
// overhead of a separate open/close on each call.
|
|
QPDF_DLL
|
|
void stayOpen(bool);
|
|
|
|
private:
|
|
ClosedFileInputSource(ClosedFileInputSource const&) = delete;
|
|
ClosedFileInputSource& operator=(ClosedFileInputSource const&) = delete;
|
|
|
|
void before();
|
|
void after();
|
|
|
|
class Members
|
|
{
|
|
friend class ClosedFileInputSource;
|
|
|
|
public:
|
|
QPDF_DLL
|
|
~Members();
|
|
|
|
private:
|
|
Members(char const* filename);
|
|
|
|
std::string filename;
|
|
qpdf_offset_t offset;
|
|
PointerHolder<FileInputSource> fis;
|
|
bool stay_open;
|
|
};
|
|
PointerHolder<Members> m;
|
|
};
|
|
|
|
#endif // QPDF_CLOSEDFILEINPUTSOURCE_HH
|