Add ClosedFileInputSource

ClosedFileInputSource is an input source that keeps the file closed
when not reading it.

1 files changed, 83 insertions, 0 deletions

diff --git a/include/qpdf/ClosedFileInputSource.hh b/include/qpdf/ClosedFileInputSource.hh
new file mode 100644
index 00000000..349b938a
--- /dev/null
+++ b/include/qpdf/ClosedFileInputSource.hh
@@ -0,0 +1,83 @@
+// Copyright (c) 2005-2018 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 effiency, 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);
+
+  private:
+    ClosedFileInputSource(ClosedFileInputSource const&);
+    ClosedFileInputSource& operator=(ClosedFileInputSource const&);
+
+    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;
+        FileInputSource* fis;
+    };
+    PointerHolder<Members> m;
+};
+
+#endif // __QPDF_CLOSEDFILEINPUTSOURCE_HH__