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testFuzzScanLines.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2007, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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// All rights reserved.
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// *       Redistributions in binary form must reproduce the above
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// its contributors may be used to endorse or promote products derived
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#include <tmpDir.h>
#include <fuzzFile.h>

#include <ImfRgbaFile.h>
#include <ImfArray.h>
#include <ImfThreading.h>
#include <IlmThread.h>
#include <Iex.h>
#include <iostream>
#include <cassert>

using namespace std;
using namespace Imath;
using namespace Imf;

namespace {

void
fillPixels (Array2D<Rgba> &pixels, int w, int h)
{
    for (int y = 0; y < h; ++y)
    {
      for (int x = 0; x < w; ++x)
      {
          Rgba &p = pixels[y][x];

          p.r = 0.5 + 0.5 * sin (0.1 * x + 0.1 * y);
          p.g = 0.5 + 0.5 * sin (0.1 * x + 0.2 * y);
          p.b = 0.5 + 0.5 * sin (0.1 * x + 0.3 * y);
          p.a = (p.r + p.b + p.g) / 3.0;
      }
    }
}


void
writeImage (const char fileName[],
          int width,
          int height,
          const Array2D<Rgba> &pixels,
          Compression comp)
{
    //
    // Save the image with the specified compression.
    //

    cout << "compression " << comp << endl;

    Header header (width, height);
    header.compression() = comp;

    RgbaOutputFile out (fileName, header, WRITE_RGBA);
    out.setFrameBuffer (&pixels[0][0], 1, width);
    out.writePixels (height);
}


void
readImage (const char fileName[])
{
    //
    // Try to read the specified file.
    // Reading should either succeed or throw an exception,
    // but it should not crash for any reason.
    //

    try
    {
      RgbaInputFile in (fileName);
      const Box2i &dw = in.dataWindow();
      
      int w = dw.max.x - dw.min.x + 1;
      int dx = dw.min.x;

      if (w > (1 << 24))
          return;

      Array<Rgba> pixels (w);
      in.setFrameBuffer (&pixels[-dx], 1, 0);

      for (int y = dw.min.y; y <= dw.max.y; ++y)
          in.readPixels (y);
    }
    catch (...)
    {
      // empty
    }
}


void
fuzzScanLines (int numThreads, Rand48 &random)
{
    if (IlmThread::supportsThreads())
    {
      setGlobalThreadCount (numThreads);
      cout << "\nnumber of threads: " << globalThreadCount() << endl;
    }

    Header::setMaxImageSize (10000, 10000);

    const int W = 217;
    const int H = 197;

    Array2D<Rgba> pixels (H, W);
    fillPixels (pixels, W, H);

    const char *goodFile = IMF_TMP_DIR "imf_test_file_fuzz_good.exr";
    const char *brokenFile = IMF_TMP_DIR "imf_test_file_fuzz_broken.exr";

    for (int comp = 0; comp < NUM_COMPRESSION_METHODS; ++comp)
    {
      writeImage (goodFile, W, H, pixels, Compression (comp));
      fuzzFile (goodFile, brokenFile, readImage, 5000, 3000, random);
    }

    remove (goodFile);
    remove (brokenFile);
}

} // namespace


void
testFuzzScanLines ()
{
    try
    {
      cout << "Testing scanline-based files "
            "with randomly inserted errors" << endl;

      Rand48 random (1);

      fuzzScanLines (0, random);

      if (IlmThread::supportsThreads())
          fuzzScanLines (2, random);

      cout << "ok\n" << endl;
    }
    catch (const std::exception &e)
    {
      cerr << "ERROR -- caught exception: " << e.what() << endl;
      assert (false);
    }
}

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