mirror of https://github.com/JakubMelka/PDF4QT.git
95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
// Copyright (C) 2018-2019 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFENCODING_H
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#define PDFENCODING_H
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#include <QString>
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#include <QDateTime>
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#include <array>
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namespace pdf
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{
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namespace encoding
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{
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using EncodingTable = std::array<QChar, 256>;
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}
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/// This class can convert byte stream to the QString in unicode encoding.
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/// PDF has several encodings, see PDF Reference 1.7, Appendix D.
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class PDFEncoding
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{
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public:
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explicit PDFEncoding() = delete;
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enum class Encoding
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{
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Standard, ///< Appendix D, Section D.1, StandardEncoding
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MacRoman, ///< Appendix D, Section D.1, MacRomanEncoding
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WinAnsi, ///< Appendix D, Section D.1, WinAnsiEncoding
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PDFDoc, ///< Appendix D, Section D.1/D.2, PDFDocEncoding
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MacExpert, ///< Appendix D, Section D.3, MacExpertEncoding
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Symbol, ///< Appendix D, Section D.4, Symbol Set and Encoding
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ZapfDingbats, ///< Appendix D, Section D.5, Zapf Dingbats Encoding
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// Following encodings are used for internal use only and are not a part of PDF reference
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Custom,
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Invalid
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};
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/// Converts byte array to the unicode string using specified encoding
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/// \param stream Stream (byte array string) to be processed
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/// \param encoding Encoding used to convert to unicode string
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/// \returns Converted unicode string
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static QString convert(const QByteArray& stream, Encoding encoding);
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/// Convert text string to the unicode string, using either PDFDocEncoding,
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/// or UTF-16BE encoding. Please see PDF Reference 1.7, Chapter 3.8.1. If
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/// UTF-16BE encoding is used, then leading bytes should be 0xFE and 0xFF
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/// \param Stream
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/// \returns Converted unicode string
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static QString convertTextString(const QByteArray& stream);
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/// Converts byte array from UTF-16BE encoding to QString with same encoding.
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/// \param Stream
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/// \returns Converted unicode string
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static QString convertFromUnicode(const QByteArray& stream);
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/// Convert stream to date time according to PDF Reference 1.7, Chapter 3.8.1.
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/// If date cannot be converted (string is invalid), then invalid QDateTime
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/// is returned.
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/// \param stream Stream, from which date/time is read
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static QDateTime convertToDateTime(const QByteArray& stream);
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/// Returns conversion table for particular encoding
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/// \param encoding Encoding
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static const encoding::EncodingTable* getTableForEncoding(Encoding encoding);
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private:
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/// Returns true, if byte array has UTF-16BE unicode marking bytes at the
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/// stream start. If they are present, then byte stream is probably encoded
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/// as unicode.
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/// \param stream Stream to be tested
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static bool hasUnicodeLeadMarkings(const QByteArray& stream);
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};
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} // namespace pdf
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#endif // PDFENCODING_H
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