/*

 * Copyright (C)2021-2026 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 "../src/turbojpeg.h"

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#define NUMPF  5

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

{

  tjhandle handle = NULL;

  void *dstBuf = NULL;

  int width = 0, height = 0, precision, sampleSize, 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_ABGR, TJPF_GRAY, TJPF_CMYK };

  if ((handle = tj3Init(TJINIT_DECOMPRESS)) == NULL)

    goto bailout;

  /* We ignore the return value of tj3DecompressHeader(), because malformed

     JPEG images that might expose issues in libjpeg-turbo might also have

     header errors that cause tj3DecompressHeader() to fail. */

  tj3DecompressHeader(handle, data, size);

  width = tj3Get(handle, TJPARAM_JPEGWIDTH);

  height = tj3Get(handle, TJPARAM_JPEGHEIGHT);

  precision = tj3Get(handle, TJPARAM_PRECISION);

  sampleSize = (precision > 8 ? 2 : 1);

  /* 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;

  tj3Set(handle, TJPARAM_SCANLIMIT, 500);

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

    int w = width, h = height;

    int pf = pixelFormats[pfi], i;

    int64_t sum = 0;

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

    tj3Set(handle, TJPARAM_BOTTOMUP, pfi == 0);

    tj3Set(handle, TJPARAM_FASTUPSAMPLE, pfi == 0);

    if (!tj3Get(handle, TJPARAM_LOSSLESS)) {

      tj3Set(handle, TJPARAM_FASTDCT, pfi == 0);

      /* Test IDCT scaling on the second and third iterations. */

      if (pfi == 1 || pfi == 2) {

        tjscalingfactor sf = { 1, pfi == 1 ? 2 : 8 };

        tj3SetScalingFactor(handle, sf);

        w = TJSCALED(width, sf);

        h = TJSCALED(height, sf);

      } else

        tj3SetScalingFactor(handle, TJUNSCALED);

      /* Test partial image decompression on the second and fourth iterations,

         if the image is large enough. */

      if ((pfi == 1 || pfi == 3) && w >= 97 && h >= 75) {

        tjregion cr = { 32, 16, 65, 59 };

        tj3SetCroppingRegion(handle, cr);

      } else

        tj3SetCroppingRegion(handle, TJUNCROPPED);

    }

    if ((dstBuf = tj3Alloc(w * h * tjPixelSize[pf] * sampleSize)) == NULL)

      goto bailout;

    if (precision == 8) {

      if (tj3Decompress8(handle, data, size, (unsigned char *)dstBuf, 0,

                         pf) == 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 += ((unsigned char *)dstBuf)[i];

      } else if (!strcmp(tj3GetErrorStr(handle),

                         "Progressive JPEG image has more than 500 scans"))

        goto bailout;

    } else if (precision == 12) {

      if (tj3Decompress12(handle, data, size, (short *)dstBuf, 0, pf) == 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 += ((short *)dstBuf)[i];

      } else if (!strcmp(tj3GetErrorStr(handle),

                         "Progressive JPEG image has more than 500 scans"))

        goto bailout;

    } else {

      if (tj3Decompress16(handle, data, size, (unsigned short *)dstBuf, 0,

                          pf) == 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 += ((unsigned short *)dstBuf)[i];

      } else if (!strcmp(tj3GetErrorStr(handle),

                         "Progressive JPEG image has more than 500 scans"))

        goto bailout;

    }

    tj3Free(dstBuf);

    dstBuf = NULL;

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

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

    if (sum > ((1LL << precision) - 1LL) * 1048576LL * tjPixelSize[pf])

      goto bailout;

  }

bailout:

  tj3Free(dstBuf);

  tj3Destroy(handle);

  return 0;

}