mirror of https://github.com/qpdf/qpdf.git
123 lines
4.1 KiB
C++
123 lines
4.1 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 QPDFEFSTREAMOBJECTHELPER_HH
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#define QPDFEFSTREAMOBJECTHELPER_HH
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#include <qpdf/QPDFObjectHelper.hh>
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#include <qpdf/DLL.h>
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#include <qpdf/QPDFObjectHandle.hh>
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#include <functional>
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// This class provides a higher level interface around Embedded File
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// Streams, which are discussed in section 7.11.4 of the ISO-32000 PDF
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// specification.
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class QPDFEFStreamObjectHelper: public QPDFObjectHelper
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{
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public:
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QPDF_DLL
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QPDFEFStreamObjectHelper(QPDFObjectHandle);
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QPDF_DLL
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virtual ~QPDFEFStreamObjectHelper() = default;
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// Date parameters are strings that conform to the PDF spec for
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// date/time strings, which is "D:yyyymmddhhmmss<z>" where <z> is
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// either "Z" for UTC or "-hh'mm'" or "+hh'mm'" for timezone
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// offset. Examples: "D:20210207161528-05'00'",
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// "D:20210207211528Z". See QUtil::qpdf_time_to_pdf_time.
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QPDF_DLL
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std::string getCreationDate();
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QPDF_DLL
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std::string getModDate();
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// Get size as reported in the object; return 0 if not present.
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QPDF_DLL
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size_t getSize();
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// Subtype is a mime type such as "text/plain"
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QPDF_DLL
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std::string getSubtype();
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// Return the MD5 checksum as stored in the object as a binary
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// string. This does not check consistency with the data. If not
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// present, return an empty string.
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QPDF_DLL
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std::string getChecksum();
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// Setters return a reference to this object so that they can be
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// used as fluent interfaces, e.g.
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// efsoh.setCreationDate(x).setModDate(y);
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// Create a new embedded file stream with the given stream data,
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// which can be provided in any of several ways. To get the new
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// object back, call getObjectHandle() on the returned object. The
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// checksum and size are computed automatically and stored. Other
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// parameters may be supplied using setters defined below.
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QPDF_DLL
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static QPDFEFStreamObjectHelper
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createEFStream(QPDF& qpdf, PointerHolder<Buffer> data);
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QPDF_DLL
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static QPDFEFStreamObjectHelper
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createEFStream(QPDF& qpdf, std::string const& data);
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// The provider function must write the data to the given
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// pipeline. The function may be called multiple times by the qpdf
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// library. You can pass QUtil::file_provider(filename) as the
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// provider to have the qpdf library provide the contents of
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// filename as a binary.
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QPDF_DLL
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static QPDFEFStreamObjectHelper
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createEFStream(QPDF& qpdf, std::function<void(Pipeline*)> provider);
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// Setters for other parameters
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QPDF_DLL
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QPDFEFStreamObjectHelper& setCreationDate(std::string const&);
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QPDF_DLL
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QPDFEFStreamObjectHelper& setModDate(std::string const&);
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// Set subtype as a mime-type, e.g. "text/plain" or
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// "application/pdf".
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QPDF_DLL
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QPDFEFStreamObjectHelper& setSubtype(std::string const&);
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private:
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QPDFObjectHandle getParam(std::string const& pkey);
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void setParam(std::string const& pkey, QPDFObjectHandle const&);
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static QPDFEFStreamObjectHelper newFromStream(QPDFObjectHandle stream);
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class Members
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{
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friend class QPDFEFStreamObjectHelper;
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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();
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Members(Members const&) = delete;
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};
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PointerHolder<Members> m;
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};
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#endif // QPDFEFSTREAMOBJECTHELPER_HH
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