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// Copyright (c) 2005-2021 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 QPDFPAGELABELDOCUMENTHELPER_HH
#define QPDFPAGELABELDOCUMENTHELPER_HH
#include <qpdf/QPDFDocumentHelper.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFNumberTreeObjectHelper.hh>
#include <vector>
#include <qpdf/DLL.h>
// Page labels are discussed in the PDF spec (ISO-32000) in section
// 12.4.2.
//
// Page labels are implemented as a number tree. Each key is a page
// index, numbered from 0. The values are dictionaries with the
// following keys, all optional:
//
// * /Type: if present, must be /PageLabel
// * /S: one of /D, /R, /r, /A, or /a for decimal, upper-case and
// lower-case Roman numeral, or upper-case and lower-case alphabetic
// * /P: if present, a fixed prefix string that is prepended to each
// page number
// * /St: the starting number, or 1 if not specified
class QPDFPageLabelDocumentHelper: public QPDFDocumentHelper
{
public:
QPDF_DLL
QPDFPageLabelDocumentHelper(QPDF&);
QPDF_DLL
virtual ~QPDFPageLabelDocumentHelper()
{
}
QPDF_DLL
bool hasPageLabels();
// Return a page label dictionary representing the page label for
// the given page. The page does not need to appear explicitly in
// the page label dictionary. This method will adjust /St as
// needed to produce a label that is suitable for the page.
QPDF_DLL
QPDFObjectHandle getLabelForPage(long long page_idx);
// Append to the incoming vector a list of objects suitable for
// inclusion in a /PageLabels dictionary's /Nums field. start_idx
// and end_idx are the indexes to the starting and ending pages
// (inclusive) in the original file, and new_start_idx is the
// index to the first page in the new file. For example, if pages
// 10 through 12 of one file are being copied to a new file as
// pages 6 through 8, you would call getLabelsForPageRange(10, 12,
// 6), which would return as many entries as are required to add
// to the new file's PageLabels. This method fabricates a suitable
// entry even if the original document has no page labels. This
// behavior facilitates using this function to incrementally build
// up a page labels tree when merging files.
QPDF_DLL
void
getLabelsForPageRange(long long start_idx, long long end_idx,
long long new_start_idx,
std::vector<QPDFObjectHandle>& new_labels);
private:
class Members
{
friend class QPDFPageLabelDocumentHelper;
public:
QPDF_DLL
~Members();
private:
Members();
Members(Members const&);
PointerHolder<QPDFNumberTreeObjectHelper> labels;
};
PointerHolder<Members> m;
};
#endif // QPDFPAGELABELDOCUMENTHELPER_HH
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