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ImfTestFile.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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//-----------------------------------------------------------------------------
//
//    Utility routines to test quickly if a given
//    file is an OpenEXR file, and whether the
//    file is scanline-based or tiled.
//
//-----------------------------------------------------------------------------


#include <ImfTestFile.h>
#include <ImfStdIO.h>
#include <ImfXdr.h>
#include <ImfVersion.h>

namespace Imf {


bool
isOpenExrFile (const char fileName[], bool &tiled)
{
    try
    {
      StdIFStream is (fileName);

      int magic, version;
      Xdr::read <StreamIO> (is, magic);
      Xdr::read <StreamIO> (is, version);

      tiled = isTiled (version);
      return magic == MAGIC;
    }
    catch (...)
    {
      tiled = false;
      return false;
    }
}


bool
isOpenExrFile (const char fileName[])
{
    bool tiled;
    return isOpenExrFile (fileName, tiled);
}


bool
isTiledOpenExrFile (const char fileName[])
{
    bool exr, tiled;
    exr = isOpenExrFile (fileName, tiled);
    return exr && tiled;
}


bool
isOpenExrFile (IStream &is, bool &tiled)
{
    try
    {
      Int64 pos = is.tellg();

      if (pos != 0)
          is.seekg (0);

      int magic, version;
      Xdr::read <StreamIO> (is, magic);
      Xdr::read <StreamIO> (is, version);

      is.seekg (pos);

      tiled = isTiled (version);
      return magic == MAGIC;
    }
    catch (...)
    {
      is.clear();
      tiled = false;
      return false;
    }
}


bool
isOpenExrFile (IStream &is)
{
    bool tiled;
    return isOpenExrFile (is, tiled);
}


bool
isTiledOpenExrFile (IStream &is)
{
    bool exr, tiled;
    exr = isOpenExrFile (is, tiled);
    return exr && tiled;
}

} // namespace Imf

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