/*

 * Copyright (C)2021, 2023 D. R. Commander.  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 the libjpeg-turbo Project 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 HOLDERS 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.

 */

#include <turbojpeg.h>

#include <stdlib.h>

#include <stdint.h>

#define NUMPF  4

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

  tjhandle handle = NULL;

  unsigned char *dstBuf = NULL;

  int width = 0, height = 0, jpegSubsamp, jpegColorspace, pfi;

  /* TJPF_RGB-TJPF_BGR share the same code paths, as do TJPF_RGBX-TJPF_XRGB and

     TJPF_RGBA-TJPF_ARGB.  Thus, the pixel formats below should be the minimum

     necessary to achieve full coverage. */

  enum TJPF pixelFormats[NUMPF] =

    { TJPF_RGB, TJPF_BGRX, TJPF_GRAY, TJPF_CMYK };

#if defined(__has_feature) && __has_feature(memory_sanitizer)

  char env[18] = "JSIMD_FORCENONE=1";

  /* The libjpeg-turbo SIMD extensions produce false positives with

     MemorySanitizer. */

  putenv(env);

#endif

  if ((handle = tjInitDecompress()) == NULL)

    goto bailout;

  /* We ignore the return value of tjDecompressHeader3(), because some JPEG

     images may have unusual subsampling configurations that the TurboJPEG API

     cannot identify but can still decompress. */

  tjDecompressHeader3(handle, data, size, &width, &height, &jpegSubsamp,

                      &jpegColorspace);

  /* Ignore 0-pixel images and images larger than 1 Megapixel, as Google's

     OSS-Fuzz target for libjpeg-turbo did.  Casting width to (uint64_t)

     prevents integer overflow if width * height > INT_MAX. */

  if (width < 1 || height < 1 || (uint64_t)width * height > 1048576)

    goto bailout;

  for (pfi = 0; pfi < NUMPF; pfi++) {

    int pf = pixelFormats[pfi], flags = TJFLAG_LIMITSCANS, i, sum = 0;

    int w = width, h = height;

    /* Test non-default decompression options on the first iteration. */

    if (pfi == 0)

      flags |= TJFLAG_BOTTOMUP | TJFLAG_FASTUPSAMPLE | TJFLAG_FASTDCT;

    /* Test IDCT scaling on the second iteration. */

    else if (pfi == 1) {

      w = (width + 1) / 2;

      h = (height + 1) / 2;

    }

    if ((dstBuf = (unsigned char *)malloc(w * h * tjPixelSize[pf])) == NULL)

      goto bailout;

    if (tjDecompress2(handle, data, size, dstBuf, w, 0, h, pf, flags) == 0) {

      /* Touch all of the output pixels in order to catch uninitialized reads

         when using MemorySanitizer. */

      for (i = 0; i < w * h * tjPixelSize[pf]; i++)

        sum += dstBuf[i];

    } else

      goto bailout;

    free(dstBuf);

    dstBuf = NULL;

    /* Prevent the code above from being optimized out.  This test should never

       be true, but the compiler doesn't know that. */

    if (sum > 255 * 1048576 * tjPixelSize[pf])

      goto bailout;

  }

bailout:

  free(dstBuf);

  if (handle) tjDestroy(handle);

  return 0;

}