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| -rw-r--r-- | include/oox/helper/binaryinputstream.hxx | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/include/oox/helper/binaryinputstream.hxx b/include/oox/helper/binaryinputstream.hxx new file mode 100644 index 000000000..e27b2def9 --- /dev/null +++ b/include/oox/helper/binaryinputstream.hxx @@ -0,0 +1,385 @@ +/* -*- 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_BINARYINPUTSTREAM_HXX +#define INCLUDED_OOX_HELPER_BINARYINPUTSTREAM_HXX + +#include <cstddef> +#include <memory> +#include <vector> + +#include <com/sun/star/uno/Reference.hxx> +#include <oox/dllapi.h> +#include <oox/helper/binarystreambase.hxx> +#include <oox/helper/helper.hxx> +#include <rtl/string.hxx> +#include <rtl/textenc.h> +#include <rtl/ustring.hxx> +#include <sal/types.h> + +namespace com::sun::star { + namespace io { class XInputStream; } +} + +namespace oox { + +class BinaryOutputStream; + + +/** Interface for binary input stream classes. + + The binary data in the stream is assumed to be in little-endian format. + */ +class OOX_DLLPUBLIC BinaryInputStream : public virtual BinaryStreamBase +{ +public: + /** Derived classes implement reading nBytes bytes to the passed sequence. + The sequence will be reallocated internally. + + @param nAtomSize + The size of the elements in the memory block, if available. Derived + classes may be interested in this information. + + @return + Number of bytes really read. + */ + virtual sal_Int32 readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0; + + /** Derived classes implement reading nBytes bytes to the (preallocated!) + memory buffer opMem. + + @param nAtomSize + The size of the elements in the memory block, if available. Derived + classes may be interested in this information. + + @return + Number of bytes really read. + */ + virtual sal_Int32 readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0; + + /** Derived classes implement seeking the stream forward by the passed + number of bytes. This should work for non-seekable streams too. + + @param nAtomSize + The size of the elements in the memory block, if available. Derived + classes may be interested in this information. + */ + virtual void skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0; + + /** Reads a value from the stream and converts it to platform byte order. + All data types supported by the ByteOrderConverter class can be used. + */ + template< typename Type > + [[nodiscard]] + Type readValue(); + + [[nodiscard]] + sal_Int8 readInt8() { return readValue<sal_Int8>(); } + [[nodiscard]] + sal_uInt8 readuInt8() { return readValue<sal_uInt8>(); } + [[nodiscard]] + sal_Int16 readInt16() { return readValue<sal_Int16>(); } + [[nodiscard]] + sal_uInt16 readuInt16() { return readValue<sal_uInt16>(); } + [[nodiscard]] + sal_Int32 readInt32() { return readValue<sal_Int32>(); } + [[nodiscard]] + sal_uInt32 readuInt32() { return readValue<sal_uInt32>(); } + [[nodiscard]] + sal_Int64 readInt64() { return readValue<sal_Int64>(); } + [[nodiscard]] + float readFloat() { return readValue<float>(); } + [[nodiscard]] + double readDouble() { return readValue<double>(); } + [[nodiscard]] + unsigned char readuChar() { return readValue<unsigned char>(); } + + /** Reads a (preallocated!) C array of values from the stream. + + Converts all values in the array to platform byte order. All data types + supported by the ByteOrderConverter class can be used. + + @param nElemCount + Number of array elements to read (NOT byte count). + + @return + Number of array elements really read (NOT byte count). + */ + template< typename Type > + sal_Int32 readArray( Type* opnArray, sal_Int32 nElemCount ); + + /** Reads a vector of values from the stream. + + The vector will be resized internally. Converts all values in the + vector to platform byte order. All data types supported by the + ByteOrderConverter class can be used. + + @param nElemCount + Number of elements to put into the vector (NOT byte count). + + @return + Number of vector elements really read (NOT byte count). + */ + template< typename Type > + sal_Int32 readArray( ::std::vector< Type >& orVector, sal_Int32 nElemCount ); + + /** Reads a NUL-terminated Unicode character array and returns the string. + */ + OUString readNulUnicodeArray(); + + /** Reads a byte character array and returns the string. + NUL characters are replaced by question marks. + + @param nChars + Number of characters (bytes) to read from the stream. + */ + OString readCharArray( sal_Int32 nChars ); + + /** Reads a byte character array and returns a Unicode string. + NUL characters are replaced by question marks. + + @param nChars + Number of characters (bytes) to read from the stream. + + @param eTextEnc + The text encoding used to create the Unicode string. + */ + OUString readCharArrayUC( sal_Int32 nChars, rtl_TextEncoding eTextEnc ); + + /** Reads a Unicode character array and returns the string. + NUL characters are replaced by question marks (default). + + @param nChars + Number of 16-bit characters to read from the stream. + */ + OUString readUnicodeArray( sal_Int32 nChars ); + + /** Reads a Unicode character array (may be compressed) and returns the + string. + NUL characters are replaced by question marks (default). + + @param nChars + Number of 8-bit or 16-bit characters to read from the stream. + + @param bCompressed + True = Character array is compressed (stored as 8-bit characters). + False = Character array is not compressed (stored as 16-bit characters). + */ + OUString readCompressedUnicodeArray( sal_Int32 nChars, bool bCompressed ); + + /** Copies bytes from the current position to the passed output stream. + */ + void copyToStream( BinaryOutputStream& rOutStrm ); + +protected: + /** This dummy default c'tor will never call the c'tor of the virtual base + class BinaryStreamBase as this class cannot be instantiated directly. */ + BinaryInputStream() : BinaryStreamBase( false ) {} + +private: + BinaryInputStream( BinaryInputStream const& ) = delete; + BinaryInputStream& operator=( BinaryInputStream const& ) = delete; +}; + +typedef std::shared_ptr< BinaryInputStream > BinaryInputStreamRef; + + +template< typename Type > +Type BinaryInputStream::readValue() +{ + Type ornValue = Type(); + readMemory( &ornValue, static_cast< sal_Int32 >( sizeof( Type ) ), sizeof( Type ) ); + ByteOrderConverter::convertLittleEndian( ornValue ); + return ornValue; +} + +template< typename Type > +sal_Int32 BinaryInputStream::readArray( Type* opnArray, sal_Int32 nElemCount ) +{ + sal_Int32 nRet = 0; + if( !mbEof ) + { + sal_Int32 nReadSize = getLimitedValue< sal_Int32, sal_Int32 >( nElemCount, 0, SAL_MAX_INT32 / sizeof( Type ) ) * sizeof( Type ); + nRet = readMemory( opnArray, nReadSize, sizeof( Type ) ) / sizeof( Type ); + ByteOrderConverter::convertLittleEndianArray( opnArray, static_cast< size_t >( nRet ) ); + } + return nRet; +} + +template< typename Type > +sal_Int32 BinaryInputStream::readArray( ::std::vector< Type >& orVector, sal_Int32 nElemCount ) +{ + orVector.resize( static_cast< size_t >( nElemCount ) ); + return orVector.empty() ? 0 : readArray(orVector.data(), nElemCount); +} + + +/** Wraps a UNO input stream and provides convenient access functions. + + The binary data in the stream is assumed to be in little-endian format. + */ +class OOX_DLLPUBLIC BinaryXInputStream final : public BinaryXSeekableStream, public BinaryInputStream +{ +public: + /** Constructs the wrapper object for the passed input stream. + + @param rxInStream + The com.sun.star.io.XInputStream interface of the UNO input stream + to be wrapped. + + @param bAutoClose + True = automatically close the wrapped input stream on destruction + of this wrapper or when close() is called. + */ + explicit BinaryXInputStream( + const css::uno::Reference< css::io::XInputStream >& rxInStrm, + bool bAutoClose ); + + virtual ~BinaryXInputStream() override; + + /** Closes the input stream. Does also close the wrapped UNO input stream + if bAutoClose has been set to true in the constructor. */ + virtual void close() override; + + /** Reads nBytes bytes to the passed sequence. + @return Number of bytes really read. */ + virtual sal_Int32 readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Reads nBytes bytes to the (existing) buffer opMem. + @return Number of bytes really read. */ + virtual sal_Int32 readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Seeks the stream forward by the passed number of bytes. This works for + non-seekable streams too. */ + virtual void skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + +private: + StreamDataSequence maBuffer; ///< Data buffer used in readMemory() function. + css::uno::Reference< css::io::XInputStream > + mxInStrm; ///< Reference to the input stream. + bool mbAutoClose; ///< True = automatically close stream on destruction. +}; + + +/** Wraps a StreamDataSequence and provides convenient access functions. + + The binary data in the stream is assumed to be in little-endian format. + */ +class OOX_DLLPUBLIC SequenceInputStream final : public SequenceSeekableStream, public BinaryInputStream +{ +public: + /** Constructs the wrapper object for the passed data sequence. + + @attention + The passed 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 read from it. + */ + explicit SequenceInputStream( const StreamDataSequence& rData ); + + /** Reads nBytes bytes to the passed sequence. + @return Number of bytes really read. */ + virtual sal_Int32 readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Reads nBytes bytes to the (existing) buffer opMem. + @return Number of bytes really read. */ + virtual sal_Int32 readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Seeks the stream forward by the passed number of bytes. This works for + non-seekable streams too. */ + virtual void skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + +private: + /** Returns the number of bytes available in the sequence for the passed byte count. */ + sal_Int32 getMaxBytes( sal_Int32 nBytes ) const + { return getLimitedValue< sal_Int32, sal_Int32 >( nBytes, 0, mpData->getLength() - mnPos ); } +}; + + +/** Wraps a BinaryInputStream and provides access to a specific part of the + stream data. + + Provides access to the stream data block starting at the current position + of the stream, and with a specific length. If the wrapped stream is + seekable, this wrapper will treat the position of the wrapped stream at + construction time as position "0" (therefore the class name). + + The passed input stream MUST live at least as long as this stream wrapper. + The stream MUST NOT be changed from outside as long as this stream wrapper + is used to read from it. + */ +class RelativeInputStream final : public BinaryInputStream +{ +public: + /** Constructs the wrapper object for the passed stream. + + @param nSize + If specified, restricts the amount of data that can be read from + the passed input stream. + */ + explicit RelativeInputStream( + BinaryInputStream& rInStrm, + sal_Int64 nSize ); + + /** Returns the size of the data block in the wrapped stream offered by + this wrapper. */ + virtual sal_Int64 size() const override; + + /** Returns the current relative stream position. */ + virtual sal_Int64 tell() const override; + + /** Seeks the stream to the passed relative position, if the wrapped stream + is seekable. */ + virtual void seek( sal_Int64 nPos ) override; + + /** Closes the input stream but not the wrapped stream. */ + virtual void close() override; + + /** Reads nBytes bytes to the passed sequence. Does not read out of the + data block whose size has been specified on construction. + @return Number of bytes really read. */ + virtual sal_Int32 readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Reads nBytes bytes to the (existing) buffer opMem. Does not read out of + the data block whose size has been specified on construction. + @return Number of bytes really read. */ + virtual sal_Int32 readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + + /** Seeks the stream forward by the passed number of bytes. This works for + non-seekable streams too. Does not seek out of the data block. */ + virtual void skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override; + +private: + /** Returns the number of bytes available in the sequence for the passed byte count. */ + sal_Int32 getMaxBytes( sal_Int32 nBytes ) const + { return getLimitedValue< sal_Int32, sal_Int64 >( nBytes, 0, mnSize - mnRelPos ); } + +private: + BinaryInputStream* mpInStrm; + sal_Int64 mnStartPos; + sal_Int64 mnRelPos; + sal_Int64 mnSize; +}; + + +} // namespace oox + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |