/*

 * Copyright (C) 2021-2026 D. R. Commander.  All Rights Reserved.

 * Copyright (C) 2025 Leslie P. Polzer.  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 <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <unistd.h>

extern "C" unsigned char *

_tj3LoadImageFromFileHandle8(tjhandle handle, FILE *file, int *width,

                             int align, int *height, int *pixelFormat);

#define NUMTESTS  6

struct test {

  int bottomUp;

  enum TJPF pf;

  enum TJSAMP subsamp;

  int fastDCT, quality, optimize, progressive, arithmetic, restartBlocks;

};

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

{

  tjhandle handle = NULL;

  unsigned char *imgBuf = NULL, *srcBuf, *dstBuf = NULL, *yuvBuf = NULL;

  int width = 0, height = 0, ti;

  FILE *file = NULL;

  struct test tests[NUMTESTS] = {

    /*

      BU Pixel      Subsampling  Fst Qual Opt Prg Ari Rst

         Format     Level        DCT                  Blks */

    { 0, TJPF_XBGR, TJSAMP_444,  1,  100, 0,  0,  0,  0    },

    { 0, TJPF_XRGB, TJSAMP_422,  0,  90,  0,  1,  0,  4    },

    { 0, TJPF_BGR,  TJSAMP_420,  0,  75,  0,  0,  0,  0    },

    { 0, TJPF_RGB,  TJSAMP_411,  0,  50,  1,  0,  0,  0    },

    { 0, TJPF_BGR,  TJSAMP_GRAY, 0,  25,  0,  0,  1,  0    },

    { 1, TJPF_GRAY, TJSAMP_GRAY, 1,  10,  0,  1,  1,  4    }

  };

  if ((file = fmemopen((void *)data, size, "r")) == NULL)

    goto bailout;

  if ((handle = tj3Init(TJINIT_COMPRESS)) == NULL)

    goto bailout;

  for (ti = 0; ti < NUMTESTS; ti++) {

    int pf = tests[ti].pf;

    size_t dstSize = 0, maxBufSize, i, sum = 0;

    /* Test non-default compression options on specific iterations. */

    tj3Set(handle, TJPARAM_BOTTOMUP, tests[ti].bottomUp);

    tj3Set(handle, TJPARAM_FASTDCT, tests[ti].fastDCT);

    tj3Set(handle, TJPARAM_OPTIMIZE, tests[ti].optimize);

    tj3Set(handle, TJPARAM_PROGRESSIVE, tests[ti].progressive);

    tj3Set(handle, TJPARAM_ARITHMETIC, tests[ti].arithmetic);

    tj3Set(handle, TJPARAM_NOREALLOC, 1);

    tj3Set(handle, TJPARAM_RESTARTBLOCKS, tests[ti].restartBlocks);

    tj3Set(handle, TJPARAM_MAXPIXELS, 1048576);

    /* tj3LoadImage8() will refuse to load images larger than 1 Megapixel, so

       we don't need to check the width and height here. */

    fseek(file, 0, SEEK_SET);

    if ((imgBuf = _tj3LoadImageFromFileHandle8(handle, file, &width, 1,

                                               &height, &pf)) == NULL) {

      if (size < 2)

        continue;

      /* Derive image dimensions from input data.  Use first 2 bytes to

         influence width/height.  These must be multiples of the maximum iMCU

         size for the subsampling levels we plan to test. */

      width = ((data[0] % 4) + 1) * 32;   /* 32-128, multiple of 32 */

      height = ((data[1] % 8) + 1) * 16;  /* 16-128, multiple of 16 */

      size_t required_size = 2 + (size_t)width * height *

                             tjPixelSize[tests[ti].pf];

      if (size < required_size) {

        /* Not enough data - try smaller dimensions */

        width = 32;

        height = 16;

        required_size = 2 + (size_t)width * height *

                        tjPixelSize[tests[ti].pf];

        if (size < required_size)

          continue;

      }

      /* Skip header bytes. */

      srcBuf = (unsigned char *)data + 2;

    } else

      srcBuf = imgBuf;

    dstSize = maxBufSize = tj3JPEGBufSize(width, height, tests[ti].subsamp);

    if ((dstBuf = (unsigned char *)tj3Alloc(dstSize)) == NULL)

      goto bailout;

    if ((yuvBuf =

         (unsigned char *)malloc(tj3YUVBufSize(width, 1, height,

                                               tests[ti].subsamp))) == NULL)

      goto bailout;

    tj3Set(handle, TJPARAM_SUBSAMP, tests[ti].subsamp);

    tj3Set(handle, TJPARAM_QUALITY, tests[ti].quality);

    if (tj3EncodeYUV8(handle, srcBuf, width, 0, height, pf, yuvBuf, 1) == 0 &&

        tj3CompressFromYUV8(handle, yuvBuf, width, 1, height, &dstBuf,

                            &dstSize) == 0) {

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

         when using MemorySanitizer. */

      for (i = 0; i < dstSize; i++)

        sum += dstBuf[i];

    }

    tj3Free(dstBuf);

    dstBuf = NULL;

    free(yuvBuf);

    yuvBuf = NULL;

    tj3Free(imgBuf);

    imgBuf = NULL;

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

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

    if (sum > 255 * maxBufSize)

      goto bailout;

  }

bailout:

  tj3Free(dstBuf);

  free(yuvBuf);

  tj3Free(imgBuf);

  if (file) fclose(file);

  tj3Destroy(handle);

  return 0;

}