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Diffstat (limited to 'lib/common/ReadGatherStream.h')
-rw-r--r-- | lib/common/ReadGatherStream.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/common/ReadGatherStream.h b/lib/common/ReadGatherStream.h new file mode 100644 index 00000000..a3e4b34d --- /dev/null +++ b/lib/common/ReadGatherStream.h @@ -0,0 +1,105 @@ +// distribution boxbackup-0.10 (svn version: 494) +// +// Copyright (c) 2003 - 2006 +// Ben Summers and contributors. All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// 1. Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// 2. Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// 3. All use of this software and associated advertising materials must +// display the following acknowledgment: +// This product includes software developed by Ben Summers. +// 4. The names of the Authors may not be used to endorse or promote +// products derived from this software without specific prior written +// permission. +// +// [Where legally impermissible the Authors do not disclaim liability for +// direct physical injury or death caused solely by defects in the software +// unless it is modified by a third party.] +// +// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR +// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, +// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +// POSSIBILITY OF SUCH DAMAGE. +// +// +// +// -------------------------------------------------------------------------- +// +// File +// Name: ReadGatherStream.h +// Purpose: Build a stream (for reading only) out of a number of other streams. +// Created: 10/12/03 +// +// -------------------------------------------------------------------------- + +#ifndef READGATHERSTREAM_H +#define READGATHERSTREAM_H + +#include "IOStream.h" + +#include <vector> + +// -------------------------------------------------------------------------- +// +// Class +// Name: ReadGatherStream +// Purpose: Build a stream (for reading only) out of a number of other streams. +// Created: 10/12/03 +// +// -------------------------------------------------------------------------- +class ReadGatherStream : public IOStream +{ +public: + ReadGatherStream(bool DeleteComponentStreamsOnDestruction); + ~ReadGatherStream(); +private: + ReadGatherStream(const ReadGatherStream &); + ReadGatherStream &operator=(const ReadGatherStream &); +public: + + int AddComponent(IOStream *pStream); + void AddBlock(int Component, pos_type Length, bool Seek = false, pos_type SeekTo = 0); + + virtual int Read(void *pBuffer, int NBytes, int Timeout = IOStream::TimeOutInfinite); + virtual pos_type BytesLeftToRead(); + virtual void Write(const void *pBuffer, int NBytes); + virtual bool StreamDataLeft(); + virtual bool StreamClosed(); + virtual pos_type GetPosition() const; + +private: + bool mDeleteComponentStreamsOnDestruction; + std::vector<IOStream *> mComponents; + + typedef struct + { + pos_type mLength; + pos_type mSeekTo; + int mComponent; + bool mSeek; + } Block; + + std::vector<Block> mBlocks; + + pos_type mCurrentPosition; + pos_type mTotalSize; + unsigned int mCurrentBlock; + pos_type mPositionInCurrentBlock; + bool mSeekDoneForCurrent; +}; + + +#endif // READGATHERSTREAM_H |