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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you 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 .
+ */
+
+#ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_PDFPARSE_HXX
+#define INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_PDFPARSE_HXX
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+#include <rtl/string.hxx>
+
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+#include <memory>
+
+namespace pdfparse
+{
+
+struct EmitImplData;
+struct PDFContainer;
+class EmitContext
+{
+public:
+ virtual bool write( const void* pBuf, unsigned int nLen ) = 0;
+ virtual unsigned int getCurPos() = 0;
+ virtual bool copyOrigBytes( unsigned int nOrigOffset, unsigned int nLen ) = 0;
+ virtual unsigned int readOrigBytes( unsigned int nOrigOffset, unsigned int nLen, void* pBuf ) = 0;
+
+ explicit EmitContext( const PDFContainer* pTop = nullptr );
+ virtual ~EmitContext();
+
+ // set this to deflate contained streams
+ bool m_bDeflate;
+ // set this to decrypt the PDF file
+ bool m_bDecrypt;
+
+private:
+ friend struct PDFEntry;
+ std::unique_ptr<EmitImplData> m_pImplData;
+};
+
+struct PDFEntry
+{
+ PDFEntry() {}
+ virtual ~PDFEntry();
+
+ virtual bool emit( EmitContext& rWriteContext ) const = 0;
+ virtual PDFEntry* clone() const = 0;
+
+protected:
+ static EmitImplData* getEmitData( EmitContext const & rContext );
+ static void setEmitData( EmitContext& rContext, EmitImplData* pNewEmitData );
+};
+
+struct PDFComment final : public PDFEntry
+{
+ OString m_aComment;
+
+ explicit PDFComment( const OString& rComment )
+ : PDFEntry(), m_aComment( rComment ) {}
+ virtual ~PDFComment() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFValue : public PDFEntry
+{
+ // abstract base class for simple values
+ PDFValue() : PDFEntry() {}
+ virtual ~PDFValue() override;
+};
+
+struct PDFName final : public PDFValue
+{
+ OString m_aName;
+
+ explicit PDFName( const OString& rName )
+ : PDFValue(), m_aName( rName ) {}
+ virtual ~PDFName() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ OUString getFilteredName() const;
+};
+
+struct PDFString final : public PDFValue
+{
+ OString m_aString;
+
+ explicit PDFString( const OString& rString )
+ : PDFValue(), m_aString( rString ) {}
+ virtual ~PDFString() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ OString getFilteredString() const;
+};
+
+struct PDFNumber final : public PDFValue
+{
+ double m_fValue;
+
+ explicit PDFNumber( double fVal )
+ : PDFValue(), m_fValue( fVal ) {}
+ virtual ~PDFNumber() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFBool final : public PDFValue
+{
+ bool m_bValue;
+
+ explicit PDFBool( bool bVal )
+ : PDFValue(), m_bValue( bVal ) {}
+ virtual ~PDFBool() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFObjectRef final : public PDFValue
+{
+ unsigned int m_nNumber;
+ unsigned int m_nGeneration;
+
+ PDFObjectRef( unsigned int nNr, unsigned int nGen )
+ : PDFValue(), m_nNumber( nNr ), m_nGeneration( nGen ) {}
+ virtual ~PDFObjectRef() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFNull final : public PDFValue
+{
+ PDFNull() {}
+ virtual ~PDFNull() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFObject;
+struct PDFContainer : public PDFEntry
+{
+ sal_Int32 m_nOffset;
+ std::vector<std::unique_ptr<PDFEntry>> m_aSubElements;
+
+ // this is an abstract base class for identifying
+ // entries that can contain sub elements besides comments
+ PDFContainer() : PDFEntry(), m_nOffset( 0 ) {}
+ virtual ~PDFContainer() override;
+ bool emitSubElements( EmitContext& rWriteContext ) const;
+ void cloneSubElements( std::vector<std::unique_ptr<PDFEntry>>& rNewSubElements ) const;
+
+ PDFObject* findObject( unsigned int nNumber, unsigned int nGeneration ) const;
+ PDFObject* findObject( PDFObjectRef const * pRef ) const
+ { return findObject( pRef->m_nNumber, pRef->m_nGeneration ); }
+};
+
+struct PDFArray final : public PDFContainer
+{
+ PDFArray() {}
+ virtual ~PDFArray() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFDict final : public PDFContainer
+{
+ typedef std::unordered_map<OString,PDFEntry*> Map;
+ Map m_aMap;
+
+ PDFDict() {}
+ virtual ~PDFDict() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ // inserting a value of NULL will remove rName and the previous value
+ // from the dictionary
+ void insertValue( const OString& rName, std::unique_ptr<PDFEntry> pValue );
+ // removes a name/value pair from the dict
+ void eraseValue( std::string_view rName );
+ // builds new map as of sub elements
+ // returns NULL if successful, else the first offending element
+ PDFEntry* buildMap();
+};
+
+struct PDFStream final : public PDFEntry
+{
+ unsigned int m_nBeginOffset;
+ unsigned int m_nEndOffset; // offset of the byte after the stream
+ PDFDict* m_pDict;
+
+ PDFStream( unsigned int nBegin, unsigned int nEnd, PDFDict* pStreamDict )
+ : PDFEntry(), m_nBeginOffset( nBegin ), m_nEndOffset( nEnd ), m_pDict( pStreamDict ) {}
+ virtual ~PDFStream() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ unsigned int getDictLength( const PDFContainer* pObjectContainer ) const; // get contents of the "Length" entry of the dict
+};
+
+struct PDFTrailer final : public PDFContainer
+{
+ PDFDict* m_pDict;
+
+ PDFTrailer() : PDFContainer(), m_pDict( nullptr ) {}
+ virtual ~PDFTrailer() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFFileImplData;
+struct PDFFile final : public PDFContainer
+{
+private:
+ mutable std::unique_ptr<PDFFileImplData> m_pData;
+ PDFFileImplData* impl_getData() const;
+public:
+ unsigned int m_nMajor; // PDF major
+ unsigned int m_nMinor; // PDF minor
+
+ PDFFile();
+ virtual ~PDFFile() override;
+
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ bool isEncrypted() const;
+
+ bool usesSupportedEncryptionFormat() const;
+
+ // this method checks whether rPwd is compatible with
+ // either user or owner password and sets up decrypt data in that case
+ // returns true if decryption can be done
+ bool setupDecryptionData( const OString& rPwd ) const;
+
+ bool decrypt( const sal_uInt8* pInBuffer, sal_uInt32 nLen,
+ sal_uInt8* pOutBuffer,
+ unsigned int nObject, unsigned int nGeneration ) const;
+};
+
+struct PDFObject final : public PDFContainer
+{
+ PDFEntry* m_pObject;
+ PDFStream* m_pStream;
+ unsigned int m_nNumber;
+ unsigned int m_nGeneration;
+
+ PDFObject( unsigned int nNr, unsigned int nGen )
+ : m_pObject( nullptr ), m_pStream( nullptr ), m_nNumber( nNr ), m_nGeneration( nGen ) {}
+ virtual ~PDFObject() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+
+ // writes only the contained stream, deflated if necessary
+ void writeStream( EmitContext& rContext, const PDFFile* pPDFFile ) const;
+
+private:
+ // returns true if stream is deflated
+ // fills *ppStream and *pBytes with start of stream and count of bytes
+ // memory returned in *ppStream must be freed with std::free afterwards
+ // fills in NULL and 0 in case of error
+ bool getDeflatedStream( std::unique_ptr<char[]>& rpStream, unsigned int* pBytes, const PDFContainer* pObjectContainer, EmitContext& rContext ) const;
+};
+
+struct PDFPart final : public PDFContainer
+{
+ PDFPart() : PDFContainer() {}
+ virtual ~PDFPart() override;
+ virtual bool emit( EmitContext& rWriteContext ) const override;
+ virtual PDFEntry* clone() const override;
+};
+
+struct PDFReader
+{
+ PDFReader() = delete;
+
+ static std::unique_ptr<PDFEntry> read( const char* pFileName );
+#ifdef _WIN32
+ static std::unique_ptr<PDFEntry> read( const char* pBuffer, unsigned int nLen );
+#endif
+};
+
+} // namespace
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */