晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2011, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       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.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT
// OWNER OR CONTRIBUTORS 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.
//
///////////////////////////////////////////////////////////////////////////

#ifndef IMFMULTIPARTINPUTFILE_H_
#define IMFMULTIPARTINPUTFILE_H_

#include "ImfGenericInputFile.h"
#include "ImfNamespace.h"
#include "ImfForward.h"
#include "ImfThreading.h"
#include "ImfExport.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER


class IMF_EXPORT MultiPartInputFile : public GenericInputFile
{
  public:
    MultiPartInputFile(const char fileName[],
                       int numThreads = globalThreadCount(),
                       bool reconstructChunkOffsetTable = true);

    MultiPartInputFile(IStream& is,
                       int numThreads = globalThreadCount(),
                       bool reconstructChunkOffsetTable = true);

    virtual ~MultiPartInputFile();

    // ----------------------
    // Count of number of parts in file
    // ---------------------
    int parts() const;
    
    
    //----------------------
    // Access to the headers
    //----------------------

    const Header &  header(int n) const;
    

    //----------------------------------
    // Access to the file format version
    //----------------------------------

    int			    version () const;


    // =----------------------------------------
    // Check whether the entire chunk offset
    // table for the part is written correctly
    // -----------------------------------------
    bool partComplete(int part) const;



    struct Data;


  private:
    Data*                           _data;

    MultiPartInputFile(const MultiPartInputFile &); // not implemented

    
    //
    // used internally by 'Part' types to access individual parts of the multipart file
    //
    template<class T> T*    getInputPart(int partNumber);
    InputPartData*          getPart(int);
    
    void                    initialize();


    

    friend class InputPart;
    friend class ScanLineInputPart;
    friend class TiledInputPart;
    friend class DeepScanLineInputPart;
    friend class DeepTiledInputPart;

    //
    // For backward compatibility.
    //

    friend class InputFile;
    friend class TiledInputFile;
    friend class ScanLineInputFile;
    friend class DeepScanLineInputFile;
    friend class DeepTiledInputFile;
};


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif /* IMFMULTIPARTINPUTFILE_H_ */

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