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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_OOX_HELPER_BINARYSTREAMBASE_HXX
+#define INCLUDED_OOX_HELPER_BINARYSTREAMBASE_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <oox/dllapi.h>
+#include <sal/types.h>
+
+namespace com::sun::star {
+ namespace io { class XSeekable; }
+}
+
+namespace oox {
+
+typedef css::uno::Sequence< sal_Int8 > StreamDataSequence;
+
+
+/** Base class for binary stream classes.
+ */
+class OOX_DLLPUBLIC BinaryStreamBase
+{
+public:
+ virtual ~BinaryStreamBase();
+
+ /** Implementations return the size of the stream, if possible.
+
+ This function may be implemented for some types of unseekable streams,
+ and MUST be implemented for all seekable streams.
+
+ @return
+ The size of the stream in bytes, or -1, if not implemented.
+ */
+ virtual sal_Int64 size() const = 0;
+
+ /** Implementations return the current stream position, if possible.
+
+ This function may be implemented for some types of unseekable streams,
+ and MUST be implemented for all seekable streams.
+
+ @return
+ The current position in the stream, or -1, if not implemented.
+ */
+ virtual sal_Int64 tell() const = 0;
+
+ /** Implementations seek the stream to the passed position, if
+ the stream is seekable.
+ */
+ virtual void seek( sal_Int64 nPos ) = 0;
+
+ /** Implementations close the stream.
+ */
+ virtual void close() = 0;
+
+ /** Returns true, if the implementation supports the seek() operation.
+
+ Implementations may still implement size() and tell() even if the
+ stream is not seekable.
+ */
+ bool isSeekable() const { return mbSeekable; }
+
+ /** Returns true, if the stream position is invalid (EOF). This flag turns
+ true *after* the first attempt to seek/read beyond the stream end.
+ */
+ bool isEof() const { return mbEof; }
+
+ /** Returns the size of the remaining data available in the stream, if
+ stream supports size() and tell(), otherwise -1.
+ */
+ sal_Int64 getRemaining() const;
+
+ /** Seeks the stream to the beginning, if stream is seekable.
+ */
+ void seekToStart() { seek( 0 ); }
+
+ /** Seeks the stream forward to a position that is a multiple of the passed
+ block size, if stream is seekable.
+
+ @param nBlockSize
+ The size of the data blocks the streams needs to be aligned to.
+
+ @param nAnchorPos
+ Position in the stream the data blocks are aligned to.
+ */
+ void alignToBlock( sal_Int32 nBlockSize, sal_Int64 nAnchorPos );
+
+protected:
+ explicit BinaryStreamBase( bool bSeekable ) : mbEof( false ), mbSeekable( bSeekable ) {}
+
+private:
+ BinaryStreamBase( const BinaryStreamBase& ) = delete;
+ BinaryStreamBase& operator=( const BinaryStreamBase& ) = delete;
+
+protected:
+ bool mbEof; ///< End of stream flag.
+
+private:
+ const bool mbSeekable; ///< True = implementation supports seeking.
+};
+
+
+/** Base class for binary input and output streams wrapping a UNO stream,
+ seekable via the com.sun.star.io.XSeekable interface.
+ */
+class BinaryXSeekableStream : public virtual BinaryStreamBase
+{
+public:
+ virtual ~BinaryXSeekableStream() override;
+
+ /** Returns the size of the stream, if wrapped stream is seekable, otherwise -1. */
+ virtual sal_Int64 size() const override;
+ /** Returns the current stream position, if wrapped stream is seekable, otherwise -1. */
+ virtual sal_Int64 tell() const override;
+ /** Seeks the stream to the passed position, if wrapped stream is seekable. */
+ virtual void seek( sal_Int64 nPos ) override;
+ /** Releases the reference to the UNO XSeekable interface. */
+ virtual void close() override;
+
+protected:
+ explicit BinaryXSeekableStream(
+ const css::uno::Reference< css::io::XSeekable >& rxSeekable );
+
+private:
+ css::uno::Reference< css::io::XSeekable >
+ mxSeekable; ///< Stream seeking interface.
+};
+
+
+/** Base class for binary input and output streams wrapping a
+ StreamDataSequence, which is always seekable.
+
+ The wrapped data sequence MUST live at least as long as this stream
+ wrapper. The data sequence MUST NOT be changed from outside as long as this
+ stream wrapper is used to modify it.
+ */
+class OOX_DLLPUBLIC SequenceSeekableStream : public virtual BinaryStreamBase
+{
+public:
+ /** Returns the size of the wrapped data sequence. */
+ virtual sal_Int64 size() const override;
+ /** Returns the current stream position. */
+ virtual sal_Int64 tell() const override;
+ /** Seeks the stream to the passed position. */
+ virtual void seek( sal_Int64 nPos ) override;
+ /** Releases the reference to the data sequence. */
+ virtual void close() override;
+
+protected:
+ explicit SequenceSeekableStream( const StreamDataSequence& rData );
+
+protected:
+ const StreamDataSequence* mpData; ///< Wrapped data sequence.
+ sal_Int32 mnPos; ///< Current position in the sequence.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */