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#include "Picture.h"

#include "libmd5/MD5.h"

#include "SEI_internal.h"

namespace vvdec

{

/**

 * Update md5 using n samples from plane, each sample is adjusted to

 * OUTBIT_BITDEPTH_DIV8.

 */

template<uint32_t OUTPUT_BITDEPTH_DIV8>

static void md5_block( libmd5::MD5& md5, const Pel* plane, uint32_t n)

{

  /* create a 64 byte buffer for packing Pel's into */

  uint8_t buf[64/OUTPUT_BITDEPTH_DIV8][OUTPUT_BITDEPTH_DIV8];

  for (uint32_t i = 0; i < n; i++)

  {

    Pel pel = plane[i];

    /* perform bitdepth and endian conversion */

    for (uint32_t d = 0; d < OUTPUT_BITDEPTH_DIV8; d++)

    {

      buf[i][d] = pel >> (d*8);

    }

  }

  md5.update((uint8_t*)buf, n * OUTPUT_BITDEPTH_DIV8);

}

Unexecuted instantiation: PicYuvMD5.cpp:void vvdec::md5_block<1u>(vvdec::libmd5::MD5&, short const*, unsigned int)

Unexecuted instantiation: PicYuvMD5.cpp:void vvdec::md5_block<2u>(vvdec::libmd5::MD5&, short const*, unsigned int)

/**

 * Update md5 with all samples in plane in raster order, each sample

 * is adjusted to OUTBIT_BITDEPTH_DIV8.

 */

template<uint32_t OUTPUT_BITDEPTH_DIV8>

static void md5_plane( libmd5::MD5& md5, const Pel* plane, uint32_t width, uint32_t height, ptrdiff_t stride)

{

  /* N is the number of samples to process per md5 update.

   * All N samples must fit in buf */

  uint32_t N = 32;

  uint32_t width_modN = width % N;

  uint32_t width_less_modN = width - width_modN;

  for (uint32_t y = 0; y < height; y++)

  {

    /* convert pels into unsigned chars in little endian byte order.

     * NB, for 8bit data, data is truncated to 8bits. */

    for (uint32_t x = 0; x < width_less_modN; x += N)

    {

      md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + x], N);

    }

    /* mop up any of the remaining line */

    md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + width_less_modN], width_modN);

  }

}

Unexecuted instantiation: PicYuvMD5.cpp:void vvdec::md5_plane<1u>(vvdec::libmd5::MD5&, short const*, unsigned int, unsigned int, long)

Unexecuted instantiation: PicYuvMD5.cpp:void vvdec::md5_plane<2u>(vvdec::libmd5::MD5&, short const*, unsigned int, unsigned int, long)

uint32_t compCRC(int bitdepth, const Pel* plane, uint32_t width, uint32_t height, ptrdiff_t stride, PictureHash &digest)

{

  uint32_t crcMsb;

  uint32_t bitVal;

  uint32_t crcVal = 0xffff;

  uint32_t bitIdx;

  for (uint32_t y = 0; y < height; y++)

  {

    for (uint32_t x = 0; x < width; x++)

    {

      // take CRC of first pictureData byte

      for(bitIdx=0; bitIdx<8; bitIdx++)

      {

        crcMsb = (crcVal >> 15) & 1;

        bitVal = (plane[y*stride+x] >> (7 - bitIdx)) & 1;

        crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);

      }

      // take CRC of second pictureData byte if bit depth is greater than 8-bits

      if(bitdepth > 8)

      {

        for(bitIdx=0; bitIdx<8; bitIdx++)

        {

          crcMsb = (crcVal >> 15) & 1;

          bitVal = (plane[y*stride+x] >> (15 - bitIdx)) & 1;

          crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);

        }

      }

    }

  }

  for(bitIdx=0; bitIdx<16; bitIdx++)

  {

    crcMsb = (crcVal >> 15) & 1;

    crcVal = ((crcVal << 1) & 0xffff) ^ (crcMsb * 0x1021);

  }

  digest.hash.push_back((crcVal>>8)  & 0xff);

  digest.hash.push_back( crcVal      & 0xff);

  return 2;

}

uint32_t calcCRC(const CPelUnitBuf& pic, PictureHash &digest, const BitDepths &bitDepths)

{

  uint32_t digestLen=0;

  digest.hash.clear();

  for (uint32_t chan = 0; chan< (uint32_t)pic.bufs.size(); chan++)

  {

    const ComponentID compID = ComponentID(chan);

    const CPelBuf area = pic.get(compID);

    digestLen = compCRC(bitDepths.recon, area.bufAt(0, 0), area.width, area.height, area.stride, digest );

  }

  return digestLen;

}

uint32_t compChecksum(int bitdepth, const Pel* plane, uint32_t width, uint32_t height, ptrdiff_t stride, PictureHash &digest, const BitDepths &/*bitDepths*/)

{

  uint32_t checksum = 0;

  uint8_t xor_mask;

  for (uint32_t y = 0; y < height; y++)

  {

    for (uint32_t x = 0; x < width; x++)

    {

      xor_mask = (x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8);

      checksum = (checksum + ((plane[y*stride+x] & 0xff) ^ xor_mask)) & 0xffffffff;

      if(bitdepth > 8)

      {

        checksum = (checksum + ((plane[y*stride+x]>>8) ^ xor_mask)) & 0xffffffff;

      }

    }

  }

  digest.hash.push_back((checksum>>24) & 0xff);

  digest.hash.push_back((checksum>>16) & 0xff);

  digest.hash.push_back((checksum>>8)  & 0xff);

  digest.hash.push_back( checksum      & 0xff);

  return 4;

}

uint32_t calcChecksum(const CPelUnitBuf& pic, PictureHash &digest, const BitDepths &bitDepths)

{

  uint32_t digestLen=0;

  digest.hash.clear();

  for(uint32_t chan=0; chan< (uint32_t)pic.bufs.size(); chan++)

  {

    const ComponentID compID=ComponentID(chan);

    const CPelBuf area = pic.get(compID);

    digestLen=compChecksum(bitDepths.recon, area.bufAt(0,0), area.width, area.height, area.stride, digest, bitDepths);

  }

  return digestLen;

}

/**

 * Calculate the MD5sum of pic, storing the result in digest.

 * MD5 calculation is performed on Y' then Cb, then Cr; each in raster order.

 * Pel data is inserted into the MD5 function in little-endian byte order,

 * using sufficient bytes to represent the picture bitdepth.  Eg, 10bit data

 * uses little-endian two byte words; 8bit data uses single byte words.

 */

uint32_t calcMD5(const CPelUnitBuf& pic, PictureHash &digest, const BitDepths &bitDepths)

{

  /* choose an md5_plane packing function based on the system bitdepth */

  typedef void (*MD5PlaneFunc)(libmd5::MD5&, const Pel*, uint32_t, uint32_t, ptrdiff_t );

  MD5PlaneFunc md5_plane_func;

  libmd5::MD5 md5[MAX_NUM_COMPONENT];

  digest.hash.clear();

  for (uint32_t chan = 0; chan< (uint32_t)pic.bufs.size(); chan++)

  {

    const ComponentID compID=ComponentID(chan);

    const CPelBuf area = pic.get(compID);

    md5_plane_func = bitDepths.recon <= 8 ? (MD5PlaneFunc)md5_plane<1> : (MD5PlaneFunc)md5_plane<2>;

    uint8_t tmp_digest[MD5_DIGEST_STRING_LENGTH];

    md5_plane_func(md5[compID], area.bufAt(0, 0), area.width, area.height, area.stride );

    md5[compID].finalize(tmp_digest);

    for(uint32_t i=0; i<MD5_DIGEST_STRING_LENGTH; i++)

    {

      digest.hash.push_back(tmp_digest[i]);

    }

  }

  return 16;

}

std::string hashToString(const PictureHash &digest, int numChar)

{

  static const char* hex = "0123456789abcdef";

  std::string result;

  CHECK_FATAL(numChar<=0, "numChar needs to be >0");

  for(int pos=0; pos<int(digest.hash.size()); pos++)

  {

    if ((pos % numChar) == 0 && pos!=0 )

    {

      result += ',';

    }

    result += hex[digest.hash[pos] >> 4];

    result += hex[digest.hash[pos] & 0xf];

  }

  return result;

}

std::string hashToString(const vvdecSEIDecodedPictureHash* digest, int numChar)

{

  static const char* hex = "0123456789abcdef";

  std::string result;

  CHECK_FATAL(numChar<=0, "numChar needs to be >0");

  for(int pos=0; pos<int(digest->digest_length); pos++)

  {

    if ((pos % numChar) == 0 && pos!=0 )

    {

      result += ',';

    }

    result += hex[digest->digest[pos] >> 4];

    result += hex[digest->digest[pos] & 0xf];

  }

  return result;

}

int calcAndPrintHashStatus(const CPelUnitBuf& pic, const vvdecSEIDecodedPictureHash* pictureHashSEI, const BitDepths &bitDepths, const MsgLevel msgl)

{

  /* calculate MD5sum for entire reconstructed picture */

  PictureHash recon_digest;

  int numChar=0;

  const char* hashType = "\0";

  if (pictureHashSEI)

  {

    switch (pictureHashSEI->method)

    {

      case vvdecHashType::VVDEC_HASHTYPE_MD5:

        {

          hashType = "MD5";

          numChar = calcMD5(pic, recon_digest, bitDepths);

          break;

        }

      case vvdecHashType::VVDEC_HASHTYPE_CRC:

        {

          hashType = "CRC";

          numChar = calcCRC(pic, recon_digest, bitDepths);

          break;

        }

      case vvdecHashType::VVDEC_HASHTYPE_CHECKSUM:

        {

          hashType = "Checksum";

          numChar = calcChecksum(pic, recon_digest, bitDepths);

          break;

        }

      default:

        {

          THROW_FATAL("Unknown hash type");

          break;

        }

    }

  }

  /* compare digest against received version */

  const char* ok = "(unk)";

  bool mismatch = false;

  if (pictureHashSEI)

  {

    ok = "(OK)";

    if ( !recon_digest.equal( *pictureHashSEI ))

    {

      ok = "(***ERROR***)";

      mismatch = true;

    }

  }

  msg( msgl, "[%s:%s,%s] ", hashType, hashToString(recon_digest, numChar).c_str(), ok);

  if (mismatch)

  {

    msg( msgl, "[rx%s:%s] ", hashType, hashToString(pictureHashSEI, numChar).c_str());

  }

  return mismatch;

}

}