CCITT fax decoder, first part

PdfForQtLib/sources/pdfccittfaxdecoder.h

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+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFCCITTFAXDECODER_H
+#define PDFCCITTFAXDECODER_H
+
+#include "pdfutils.h"
+
+namespace pdf
+{
+
+struct PDFCCITTCode;
+
+class PDFCCITTFaxDecoder
+{
+public:
+    explicit PDFCCITTFaxDecoder(const QByteArray* stream);
+
+private:
+    uint32_t getRunLength(bool white);
+
+    uint32_t getWhiteCode();
+    uint32_t getBlackCode();
+
+    uint32_t getCode(const PDFCCITTCode* codes, size_t codeCount);
+
+    PDFBitReader m_reader;
+};
+
+}   // namespace pdf
+
+#endif // PDFCCITTFAXDECODER_H