/* -*- C++ -*-
 * File: libraw_crxdec.cpp
 * Copyright (C) 2018-2019 Alexey Danilchenko
 * Copyright (C) 2019 Alex Tutubalin, LibRaw LLC
 *
   Canon CR3 file decoder

LibRaw is free software; you can redistribute it and/or modify
it under the terms of the one of two licenses as you choose:

1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
   (See file LICENSE.LGPL provided in LibRaw distribution archive for details).

2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
   (See file LICENSE.CDDL provided in LibRaw distribution archive for details).

 */

#include "../../internal/libraw_cxx_defs.h"

#ifdef _abs
#undef _abs
#undef _min
#undef _constrain
#endif
#define _abs(x) (((x) ^ ((int32_t)(x) >> 31)) - ((int32_t)(x) >> 31))
#define _min(a, b) ((a) < (b) ? (a) : (b))
#define _constrain(x, l, u) ((x) < (l) ? (l) : ((x) > (u) ? (u) : (x)))

#if defined(__clang__) || defined(__GNUG__)
#define libraw_inline inline __attribute__((always_inline))
#elif defined(_MSC_VER) && _MSC_VER > 1400
#define libraw_inline __forceinline
#else
#define libraw_inline inline
#endif

// this should be divisible by 4
#define CRX_BUF_SIZE 0x10000
#if !defined(_WIN32) || (defined(__GNUC__) && !defined(__INTRINSIC_SPECIAL__BitScanReverse))
/* __INTRINSIC_SPECIAL__BitScanReverse found in MinGW32-W64 v7.30 headers, may be there is a better solution? */
typedef uint32_t DWORD;
libraw_inline void _BitScanReverse(DWORD *Index, unsigned long Mask)
{
  *Index = sizeof(unsigned long) * 8 - 1 - __builtin_clzl(Mask);
}
#if LibRawBigEndian
#define _byteswap_ulong(x) (x)
#else
#define _byteswap_ulong(x) __builtin_bswap32(x)
#endif
#endif

struct CrxBitstream
{
  uint8_t mdatBuf[CRX_BUF_SIZE];
  uint64_t mdatSize;
  uint64_t curBufOffset;
  uint32_t curPos;
  uint32_t curBufSize;
  uint32_t bitData;
  int32_t bitsLeft;
  LibRaw_abstract_datastream *input;
};

struct CrxBandParam
{
  CrxBitstream bitStream;
  int16_t subbandWidth;
  int16_t subbandHeight;
  int32_t roundedBitsMask;
  int32_t roundedBits;
  int16_t curLine;
  int32_t *lineBuf0;
  int32_t *lineBuf1;
  int32_t *lineBuf2;
  int32_t sParam;
  int32_t kParam;
  int32_t *paramData;
  int32_t *nonProgrData;
  bool supportsPartial;
};

struct CrxWaveletTransform
{
  int32_t *subband0Buf;
  int32_t *subband1Buf;
  int32_t *subband2Buf;
  int32_t *subband3Buf;
  int32_t *lineBuf[8];
  int16_t curLine;
  int16_t curH;
  int8_t fltTapH;
  int16_t height;
  int16_t width;
};

struct CrxSubband
{
  CrxBandParam *bandParam;
  uint64_t mdatOffset;
  uint8_t *bandBuf;
  uint16_t width;
  uint16_t height;
  int32_t qParam;
  int32_t kParam;
  int32_t qStepBase;
  uint32_t qStepMult;
  bool supportsPartial;
  int32_t bandSize;
  uint64_t dataSize;
  int64_t dataOffset;
  short rowStartAddOn;
  short rowEndAddOn;
  short colStartAddOn;
  short colEndAddOn;
  short levelShift;
};

struct CrxPlaneComp
{
  uint8_t *compBuf;
  CrxSubband *subBands;
  CrxWaveletTransform *wvltTransform;
  int8_t compNumber;
  int64_t dataOffset;
  int32_t compSize;
  bool supportsPartial;
  int32_t roundedBitsMask;
  int8_t tileFlag;
};

struct CrxQStep
{
  uint32_t *qStepTbl;
  int width;
  int height;
};

struct CrxTile
{
  CrxPlaneComp *comps;
  int8_t tileFlag;
  int8_t tileNumber;
  int64_t dataOffset;
  int32_t tileSize;
  uint16_t width;
  uint16_t height;
  bool hasQPData;
  CrxQStep *qStep;
  uint32_t mdatQPDataSize;
  uint16_t mdatExtraSize;
};

struct CrxImage
{
  uint8_t nPlanes;
  uint16_t planeWidth;
  uint16_t planeHeight;
  uint8_t samplePrecision;
  uint8_t medianBits;
  uint8_t subbandCount;
  uint8_t levels;
  uint8_t nBits;
  uint8_t encType;
  uint8_t tileCols;
  uint8_t tileRows;
  CrxTile *tiles;
  uint64_t mdatOffset;
  uint64_t mdatSize;
  int16_t *outBufs[4]; // one per plane
  int16_t *planeBuf;
  LibRaw_abstract_datastream *input;
#ifdef LIBRAW_CR3_MEMPOOL
  libraw_memmgr memmgr;
  CrxImage() : memmgr(0) {}
#endif
};

enum TileFlags
{
  E_HAS_TILES_ON_THE_RIGHT = 1,
  E_HAS_TILES_ON_THE_LEFT = 2,
  E_HAS_TILES_ON_THE_BOTTOM = 4,
  E_HAS_TILES_ON_THE_TOP = 8
};

int32_t exCoefNumTbl[144] = {1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
                             0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0,
                             0, 0, 1, 2, 2, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 2, 2,
                             1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 2, 2, 2, 2, 1, 1, 1,
                             1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 0, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1};

int32_t q_step_tbl[8] = {0x28, 0x2D, 0x33, 0x39, 0x40, 0x48};

uint32_t JS[32] = {1,    1,    1,     1,     2,     2,     2,      2,      4,      4,     4,
                   4,    8,    8,     8,     8,     0x10,  0x10,   0x20,   0x20,   0x40,  0x40,
                   0x80, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000};

uint32_t J[32] = {0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,    2,    3,    3,    3,    3,
                  4, 4, 5, 5, 6, 6, 7, 7, 8, 9, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};

static inline void crxFillBuffer(CrxBitstream *bitStrm)
{
  if (bitStrm->curPos >= bitStrm->curBufSize && bitStrm->mdatSize)
  {
    bitStrm->curPos = 0;
    bitStrm->curBufOffset += bitStrm->curBufSize;
#ifdef LIBRAW_USE_OPENMP
#pragma omp critical
#endif
    {
#ifndef LIBRAW_USE_OPENMP
      bitStrm->input->lock();
#endif
      bitStrm->input->seek(bitStrm->curBufOffset, SEEK_SET);
      bitStrm->curBufSize = bitStrm->input->read(bitStrm->mdatBuf, 1, _min(bitStrm->mdatSize, CRX_BUF_SIZE));
#ifndef LIBRAW_USE_OPENMP
      bitStrm->input->unlock();
#endif
    }
    if (bitStrm->curBufSize < 1) // nothing read
      throw LIBRAW_EXCEPTION_IO_EOF;
    bitStrm->mdatSize -= bitStrm->curBufSize;
  }
}

libraw_inline int crxBitstreamGetZeros(CrxBitstream *bitStrm)
{
  uint32_t nonZeroBit = 0;
  uint64_t nextData = 0;
  int32_t result = 0;

  if (bitStrm->bitData)
  {
    _BitScanReverse((DWORD *)&nonZeroBit, (DWORD)bitStrm->bitData);
    result = 31 - nonZeroBit;
    bitStrm->bitData <<= 32 - nonZeroBit;
    bitStrm->bitsLeft -= 32 - nonZeroBit;
  }
  else
  {
    uint32_t bitsLeft = bitStrm->bitsLeft;
    while (1)
    {
      while (bitStrm->curPos + 4 <= bitStrm->curBufSize)
      {
        nextData = _byteswap_ulong(*(uint32_t *)(bitStrm->mdatBuf + bitStrm->curPos));
        bitStrm->curPos += 4;
        crxFillBuffer(bitStrm);
        if (nextData)
        {
          _BitScanReverse((DWORD *)&nonZeroBit, (DWORD)nextData);
          result = bitsLeft + 31 - nonZeroBit;
          bitStrm->bitData = nextData << (32 - nonZeroBit);
          bitStrm->bitsLeft = nonZeroBit;
          return result;
        }
        bitsLeft += 32;
      }
      if (bitStrm->curBufSize < bitStrm->curPos + 1)
        break; // error
      nextData = bitStrm->mdatBuf[bitStrm->curPos++];
      crxFillBuffer(bitStrm);
      if (nextData)
        break;
      bitsLeft += 8;
    }
    _BitScanReverse((DWORD *)&nonZeroBit, (DWORD)nextData);
    result = (uint32_t)(bitsLeft + 7 - nonZeroBit);
    bitStrm->bitData = nextData << (32 - nonZeroBit);
    bitStrm->bitsLeft = nonZeroBit;
  }
  return result;
}

libraw_inline uint32_t crxBitstreamGetBits(CrxBitstream *bitStrm, int bits)
{
  int bitsLeft = bitStrm->bitsLeft;
  uint32_t bitData = bitStrm->bitData;
  uint32_t nextWord;
  uint8_t nextByte;
  uint32_t result;

  if (bitsLeft < bits)
  {
    // get them from stream
    if (bitStrm->curPos + 4 <= bitStrm->curBufSize)
    {
      nextWord = _byteswap_ulong(*(uint32_t *)(bitStrm->mdatBuf + bitStrm->curPos));
      bitStrm->curPos += 4;
      crxFillBuffer(bitStrm);
      bitStrm->bitsLeft = 32 - (bits - bitsLeft);
      result = ((nextWord >> bitsLeft) | bitData) >> (32 - bits);
      bitStrm->bitData = nextWord << (bits - bitsLeft);
      return result;
    }
    // less than a word left - read byte at a time
    do
    {
      if (bitStrm->curPos >= bitStrm->curBufSize)
        break; // error
      bitsLeft += 8;
      nextByte = bitStrm->mdatBuf[bitStrm->curPos++];
      crxFillBuffer(bitStrm);
      bitData |= nextByte << (32 - bitsLeft);
    } while (bitsLeft < bits);
  }
  result = bitData >> (32 - bits); // 32-bits
  bitStrm->bitData = bitData << bits;
  bitStrm->bitsLeft = bitsLeft - bits;
  return result;
}

libraw_inline int32_t crxPrediction(int32_t left, int32_t top, int32_t deltaH, int32_t deltaV)
{
  int32_t symb[4] = {left + deltaH, left + deltaH, left, top};

  return symb[(((deltaV < 0) ^ (deltaH < 0)) << 1) + ((left < top) ^ (deltaH < 0))];
}

libraw_inline int32_t crxPredictKParameter(int32_t prevK, int32_t bitCode, int32_t maxVal = 0)
{
  int32_t newKParam = prevK - (bitCode < (1 << prevK >> 1)) + ((bitCode >> prevK) > 2) + ((bitCode >> prevK) > 5);

  return !maxVal || newKParam < maxVal ? newKParam : maxVal;
}

libraw_inline void crxDecodeSymbolL1(CrxBandParam *param, int32_t doMedianPrediction, int32_t notEOL = 0)
{
  if (doMedianPrediction)
  {
    int32_t symb[4];

    int32_t delta = param->lineBuf0[1] - param->lineBuf0[0];
    symb[2] = param->lineBuf1[0];
    symb[0] = symb[1] = delta + symb[2];
    symb[3] = param->lineBuf0[1];

    param->lineBuf1[1] = symb[(((param->lineBuf0[0] < param->lineBuf1[0]) ^ (delta < 0)) << 1) +
                              ((param->lineBuf1[0] < param->lineBuf0[1]) ^ (delta < 0))];
  }
  else
    param->lineBuf1[1] = param->lineBuf0[1];

  // get next error symbol
  uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
  if (bitCode >= 41)
    bitCode = crxBitstreamGetBits(&param->bitStream, 21);
  else if (param->kParam)
    bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);

  // add converted (+/-) error code to predicted value
  param->lineBuf1[1] += -(bitCode & 1) ^ (bitCode >> 1);

  // for not end of the line - use one symbol ahead to estimate next K
  if (notEOL)
  {
    int32_t nextDelta = (param->lineBuf0[2] - param->lineBuf0[1]) << 1;
    bitCode = (bitCode + _abs(nextDelta)) >> 1;
    ++param->lineBuf0;
  }

  // update K parameter
  param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);

  ++param->lineBuf1;
}

int crxDecodeLine(CrxBandParam *param)
{
  int length = param->subbandWidth;

  param->lineBuf1[0] = param->lineBuf0[1];
  for (; length > 1; --length)
  {
    if (param->lineBuf1[0] != param->lineBuf0[1] || param->lineBuf1[0] != param->lineBuf0[2])
    {
      crxDecodeSymbolL1(param, 1, 1);
    }
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        while (crxBitstreamGetBits(&param->bitStream, 1))
        {
          nSyms += JS[param->sParam];
          if (nSyms > length)
          {
            nSyms = length;
            break;
          }
          if (param->sParam < 31)
            ++param->sParam;
          if (nSyms == length)
            break;
        }

        if (nSyms < length)
        {
          if (J[param->sParam])
            nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
          if (param->sParam > 0)
            --param->sParam;
          if (nSyms > length)
            return -1;
        }

        length -= nSyms;

        // copy symbol nSyms times
        param->lineBuf0 += nSyms;

        // copy symbol nSyms times
        while (nSyms-- > 0)
        {
          param->lineBuf1[1] = param->lineBuf1[0];
          ++param->lineBuf1;
        }
      }

      if (length > 0)
        crxDecodeSymbolL1(param, 0, (length > 1));
    }
  }

  if (length == 1)
    crxDecodeSymbolL1(param, 1, 0);

  param->lineBuf1[1] = param->lineBuf1[0] + 1;

  return 0;
}

libraw_inline void crxDecodeSymbolL1Rounded(CrxBandParam *param, int32_t doSym = 1, int32_t doCode = 1)
{
  int32_t sym = param->lineBuf0[1];

  if (doSym)
  {
    // calculate the next symbol gradient
    int32_t symb[4];
    int32_t deltaH = param->lineBuf0[1] - param->lineBuf0[0];
    symb[2] = param->lineBuf1[0];
    symb[0] = symb[1] = deltaH + symb[2];
    symb[3] = param->lineBuf0[1];
    sym = symb[(((param->lineBuf0[0] < param->lineBuf1[0]) ^ (deltaH < 0)) << 1) +
               ((param->lineBuf1[0] < param->lineBuf0[1]) ^ (deltaH < 0))];
  }

  uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
  if (bitCode >= 41)
    bitCode = crxBitstreamGetBits(&param->bitStream, 21);
  else if (param->kParam)
    bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
  int32_t code = -(bitCode & 1) ^ (bitCode >> 1);
  param->lineBuf1[1] = param->roundedBitsMask * 2 * code + (code >> 31) + sym;

  if (doCode)
  {
    if (param->lineBuf0[2] > param->lineBuf0[1])
      code = (param->lineBuf0[2] - param->lineBuf0[1] + param->roundedBitsMask - 1) >> param->roundedBits;
    else
      code = -((param->lineBuf0[1] - param->lineBuf0[2] + param->roundedBitsMask) >> param->roundedBits);

    param->kParam = crxPredictKParameter(param->kParam, (bitCode + 2 * _abs(code)) >> 1, 15);
  }
  else
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);

  ++param->lineBuf1;
}

int crxDecodeLineRounded(CrxBandParam *param)
{
  int32_t valueReached = 0;

  param->lineBuf0[0] = param->lineBuf0[1];
  param->lineBuf1[0] = param->lineBuf0[1];
  int32_t length = param->subbandWidth;

  for (; length > 1; --length)
  {
    if (_abs(param->lineBuf0[2] - param->lineBuf0[1]) > param->roundedBitsMask)
    {
      crxDecodeSymbolL1Rounded(param);
      ++param->lineBuf0;
      valueReached = 1;
    }
    else if (valueReached || _abs(param->lineBuf0[0] - param->lineBuf1[0]) > param->roundedBitsMask)
    {
      crxDecodeSymbolL1Rounded(param);
      ++param->lineBuf0;
      valueReached = 0;
    }
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        while (crxBitstreamGetBits(&param->bitStream, 1))
        {
          nSyms += JS[param->sParam];
          if (nSyms > length)
          {
            nSyms = length;
            break;
          }
          if (param->sParam < 31)
            ++param->sParam;
          if (nSyms == length)
            break;
        }
        if (nSyms < length)
        {
          if (J[param->sParam])
            nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
          if (param->sParam > 0)
            --param->sParam;
        }
        if (nSyms > length)
          return -1;
      }
      length -= nSyms;

      // copy symbol nSyms times
      param->lineBuf0 += nSyms;

      // copy symbol nSyms times
      while (nSyms-- > 0)
      {
        param->lineBuf1[1] = param->lineBuf1[0];
        ++param->lineBuf1;
      }

      if (length > 1)
      {
        crxDecodeSymbolL1Rounded(param, 0);
        ++param->lineBuf0;
        valueReached = _abs(param->lineBuf0[1] - param->lineBuf0[0]) > param->roundedBitsMask;
      }
      else if (length == 1)
        crxDecodeSymbolL1Rounded(param, 0, 0);
    }
  }
  if (length == 1)
    crxDecodeSymbolL1Rounded(param, 1, 0);

  param->lineBuf1[1] = param->lineBuf1[0] + 1;

  return 0;
}

int crxDecodeLineNoRefPrevLine(CrxBandParam *param)
{
  int32_t i = 0;

  for (; i < param->subbandWidth - 1; i++)
  {
    if (param->lineBuf0[i + 2] | param->lineBuf0[i + 1] | param->lineBuf1[i])
    {
      uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
      if (bitCode >= 41)
        bitCode = crxBitstreamGetBits(&param->bitStream, 21);
      else if (param->kParam)
        bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
      param->lineBuf1[i + 1] = -(bitCode & 1) ^ (bitCode >> 1);
      param->kParam = crxPredictKParameter(param->kParam, bitCode);
      if (param->lineBuf2[i + 1] - param->kParam <= 1)
      {
        if (param->kParam >= 15)
          param->kParam = 15;
      }
      else
        ++param->kParam;
    }
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        if (i != param->subbandWidth - 1)
        {
          while (crxBitstreamGetBits(&param->bitStream, 1))
          {
            nSyms += JS[param->sParam];
            if (i + nSyms > param->subbandWidth)
            {
              nSyms = param->subbandWidth - i;
              break;
            }
            if (param->sParam < 31)
              ++param->sParam;
            if (i + nSyms == param->subbandWidth)
              break;
          }
          if (i + nSyms < param->subbandWidth)
          {
            if (J[param->sParam])
              nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
            if (param->sParam > 0)
              --param->sParam;
          }
          if (i + nSyms > param->subbandWidth)
            return -1;
        }
      }
      else if (i > param->subbandWidth)
        return -1;

      if (nSyms > 0)
      {
        memset(param->lineBuf1 + i + 1, 0, nSyms * sizeof(int32_t));
        memset(param->lineBuf2 + i, 0, nSyms * sizeof(int32_t));
        i += nSyms;
      }

      if (i >= param->subbandWidth - 1)
      {
        if (i == param->subbandWidth - 1)
        {
          uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
          if (bitCode >= 41)
            bitCode = crxBitstreamGetBits(&param->bitStream, 21);
          else if (param->kParam)
            bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
          param->lineBuf1[i + 1] = -((bitCode + 1) & 1) ^ ((bitCode + 1) >> 1);
          param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
          param->lineBuf2[i] = param->kParam;
        }
        continue;
      }
      else
      {
        uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
        if (bitCode >= 41)
          bitCode = crxBitstreamGetBits(&param->bitStream, 21);
        else if (param->kParam)
          bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
        param->lineBuf1[i + 1] = -((bitCode + 1) & 1) ^ ((bitCode + 1) >> 1);
        param->kParam = crxPredictKParameter(param->kParam, bitCode);
        if (param->lineBuf2[i + 1] - param->kParam <= 1)
        {
          if (param->kParam >= 15)
            param->kParam = 15;
        }
        else
          ++param->kParam;
      }
    }
    param->lineBuf2[i] = param->kParam;
  }
  if (i == param->subbandWidth - 1)
  {
    int32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
    param->lineBuf1[i + 1] = -(bitCode & 1) ^ (bitCode >> 1);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    param->lineBuf2[i] = param->kParam;
  }

  return 0;
}

int crxDecodeTopLine(CrxBandParam *param)
{
  param->lineBuf1[0] = 0;

  int32_t length = param->subbandWidth;

  // read the line from bitstream
  for (; length > 1; --length)
  {
    if (param->lineBuf1[0])
      param->lineBuf1[1] = param->lineBuf1[0];
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        while (crxBitstreamGetBits(&param->bitStream, 1))
        {
          nSyms += JS[param->sParam];
          if (nSyms > length)
          {
            nSyms = length;
            break;
          }
          if (param->sParam < 31)
            ++param->sParam;
          if (nSyms == length)
            break;
        }
        if (nSyms < length)
        {
          if (J[param->sParam])
            nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
          if (param->sParam > 0)
            --param->sParam;
          if (nSyms > length)
            return -1;
        }

        length -= nSyms;

        // copy symbol nSyms times
        while (nSyms-- > 0)
        {
          param->lineBuf1[1] = param->lineBuf1[0];
          ++param->lineBuf1;
        }

        if (length <= 0)
          break;
      }

      param->lineBuf1[1] = 0;
    }

    uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
    param->lineBuf1[1] += -(bitCode & 1) ^ (bitCode >> 1);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    ++param->lineBuf1;
  }

  if (length == 1)
  {
    param->lineBuf1[1] = param->lineBuf1[0];
    uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
    param->lineBuf1[1] += -(bitCode & 1) ^ (bitCode >> 1);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    ++param->lineBuf1;
  }

  param->lineBuf1[1] = param->lineBuf1[0] + 1;

  return 0;
}

int crxDecodeTopLineRounded(CrxBandParam *param)
{
  param->lineBuf1[0] = 0;

  int32_t length = param->subbandWidth;

  // read the line from bitstream
  for (; length > 1; --length)
  {
    if (_abs(param->lineBuf1[0]) > param->roundedBitsMask)
      param->lineBuf1[1] = param->lineBuf1[0];
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        while (crxBitstreamGetBits(&param->bitStream, 1))
        {
          nSyms += JS[param->sParam];
          if (nSyms > length)
          {
            nSyms = length;
            break;
          }
          if (param->sParam < 31)
            ++param->sParam;
          if (nSyms == length)
            break;
        }
        if (nSyms < length)
        {
          if (J[param->sParam])
            nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
          if (param->sParam > 0)
            --param->sParam;
          if (nSyms > length)
            return -1;
        }
      }

      length -= nSyms;

      // copy symbol nSyms times
      while (nSyms-- > 0)
      {
        param->lineBuf1[1] = param->lineBuf1[0];
        ++param->lineBuf1;
      }

      if (length <= 0)
        break;

      param->lineBuf1[1] = 0;
    }

    uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);

    int32_t sVal = -(bitCode & 1) ^ (bitCode >> 1);
    param->lineBuf1[1] += param->roundedBitsMask * 2 * sVal + (sVal >> 31);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    ++param->lineBuf1;
  }

  if (length == 1)
  {
    uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
    int32_t sVal = -(bitCode & 1) ^ (bitCode >> 1);
    param->lineBuf1[1] += param->roundedBitsMask * 2 * sVal + (sVal >> 31);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    ++param->lineBuf1;
  }

  param->lineBuf1[1] = param->lineBuf1[0] + 1;

  return 0;
}

int crxDecodeTopLineNoRefPrevLine(CrxBandParam *param)
{
  param->lineBuf0[0] = 0;
  param->lineBuf1[0] = 0;
  int32_t length = param->subbandWidth;
  for (; length > 1; --length)
  {
    if (param->lineBuf1[0])
    {
      uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
      if (bitCode >= 41)
        bitCode = crxBitstreamGetBits(&param->bitStream, 21);
      else if (param->kParam)
        bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
      param->lineBuf1[1] = -(bitCode & 1) ^ (bitCode >> 1);
      param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    }
    else
    {
      int nSyms = 0;
      if (crxBitstreamGetBits(&param->bitStream, 1))
      {
        nSyms = 1;
        while (crxBitstreamGetBits(&param->bitStream, 1))
        {
          nSyms += JS[param->sParam];
          if (nSyms > length)
          {
            nSyms = length;
            break;
          }
          if (param->sParam < 31)
            ++param->sParam;
          if (nSyms == length)
            break;
        }
        if (nSyms < length)
        {
          if (J[param->sParam])
            nSyms += crxBitstreamGetBits(&param->bitStream, J[param->sParam]);
          if (param->sParam > 0)
            --param->sParam;
          if (nSyms > length)
            return -1;
        }
      }

      length -= nSyms;

      // copy symbol nSyms times
      while (nSyms-- > 0)
      {
        param->lineBuf2[0] = 0;
        param->lineBuf1[1] = 0;
        ++param->lineBuf1;
        ++param->lineBuf2;
      }

      if (length <= 0)
        break;
      uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
      if (bitCode >= 41)
        bitCode = crxBitstreamGetBits(&param->bitStream, 21);
      else if (param->kParam)
        bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
      param->lineBuf1[1] = -((bitCode + 1) & 1) ^ ((bitCode + 1) >> 1);
      param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    }
    param->lineBuf2[0] = param->kParam;
    ++param->lineBuf2;
    ++param->lineBuf1;
  }

  if (length == 1)
  {
    uint32_t bitCode = crxBitstreamGetZeros(&param->bitStream);
    if (bitCode >= 41)
      bitCode = crxBitstreamGetBits(&param->bitStream, 21);
    else if (param->kParam)
      bitCode = crxBitstreamGetBits(&param->bitStream, param->kParam) | (bitCode << param->kParam);
    param->lineBuf1[1] = -(bitCode & 1) ^ (bitCode >> 1);
    param->kParam = crxPredictKParameter(param->kParam, bitCode, 15);
    param->lineBuf2[0] = param->kParam;
    ++param->lineBuf1;
  }

  param->lineBuf1[1] = 0;

  return 0;
}

int crxDecodeLine(CrxBandParam *param, uint8_t *bandBuf)
{
  if (!param || !bandBuf)
    return -1;
  if (param->curLine >= param->subbandHeight)
    return -1;

  if (param->curLine == 0)
  {
    int32_t lineLength = param->subbandWidth + 2;

    param->sParam = 0;
    param->kParam = 0;
    if (param->supportsPartial)
    {
      if (param->roundedBitsMask <= 0)
      {
        param->lineBuf0 = (int32_t *)param->paramData;
        param->lineBuf1 = param->lineBuf0 + lineLength;
        int32_t *lineBuf = param->lineBuf1 + 1;
        if (crxDecodeTopLine(param))
          return -1;
        memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
        ++param->curLine;
      }
      else
      {
        param->roundedBits = 1;
        if (param->roundedBitsMask & ~1)
        {
          while (param->roundedBitsMask >> param->roundedBits)
            ++param->roundedBits;
        }
        param->lineBuf0 = (int32_t *)param->paramData;
        param->lineBuf1 = param->lineBuf0 + lineLength;
        int32_t *lineBuf = param->lineBuf1 + 1;
        if (crxDecodeTopLineRounded(param))
          return -1;
        memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
        ++param->curLine;
      }
    }
    else
    {
      param->lineBuf2 = (int32_t *)param->nonProgrData;
      param->lineBuf0 = (int32_t *)param->paramData;
      param->lineBuf1 = param->lineBuf0 + lineLength;
      int32_t *lineBuf = param->lineBuf1 + 1;
      if (crxDecodeTopLineNoRefPrevLine(param))
        return -1;
      memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
      ++param->curLine;
    }
  }
  else if (!param->supportsPartial)
  {
    int32_t lineLength = param->subbandWidth + 2;
    param->lineBuf2 = (int32_t *)param->nonProgrData;
    if (param->curLine & 1)
    {
      param->lineBuf1 = (int32_t *)param->paramData;
      param->lineBuf0 = param->lineBuf1 + lineLength;
    }
    else
    {
      param->lineBuf0 = (int32_t *)param->paramData;
      param->lineBuf1 = param->lineBuf0 + lineLength;
    }
    int32_t *lineBuf = param->lineBuf1 + 1;
    if (crxDecodeLineNoRefPrevLine(param))
      return -1;
    memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
    ++param->curLine;
  }
  else if (param->roundedBitsMask <= 0)
  {
    int32_t lineLength = param->subbandWidth + 2;
    if (param->curLine & 1)
    {
      param->lineBuf1 = (int32_t *)param->paramData;
      param->lineBuf0 = param->lineBuf1 + lineLength;
    }
    else
    {
      param->lineBuf0 = (int32_t *)param->paramData;
      param->lineBuf1 = param->lineBuf0 + lineLength;
    }
    int32_t *lineBuf = param->lineBuf1 + 1;
    if (crxDecodeLine(param))
      return -1;
    memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
    ++param->curLine;
  }
  else
  {
    int32_t lineLength = param->subbandWidth + 2;
    if (param->curLine & 1)
    {
      param->lineBuf1 = (int32_t *)param->paramData;
      param->lineBuf0 = param->lineBuf1 + lineLength;
    }
    else
    {
      param->lineBuf0 = (int32_t *)param->paramData;
      param->lineBuf1 = param->lineBuf0 + lineLength;
    }
    int32_t *lineBuf = param->lineBuf1 + 1;
    if (crxDecodeLineRounded(param))
      return -1;
    memcpy(bandBuf, lineBuf, param->subbandWidth * sizeof(int32_t));
    ++param->curLine;
  }
  return 0;
}

int crxUpdateQparam(CrxSubband *subband)
{
  uint32_t bitCode = crxBitstreamGetZeros(&subband->bandParam->bitStream);
  if (bitCode >= 23)
    bitCode = crxBitstreamGetBits(&subband->bandParam->bitStream, 8);
  else if (subband->kParam)
    bitCode = crxBitstreamGetBits(&subband->bandParam->bitStream, subband->kParam) | (bitCode << subband->kParam);

  subband->qParam += -(bitCode & 1) ^ (bitCode >> 1); // converting encoded to signed integer
  subband->kParam = crxPredictKParameter(subband->kParam, bitCode);
  if (subband->kParam > 7)
    return -1;
  return 0;
}

libraw_inline int getSubbandRow(CrxSubband *band, int row)
{
  return row < band->rowStartAddOn
             ? 0
             : (row < band->height - band->rowEndAddOn ? row - band->rowEndAddOn
                                                       : band->height - band->rowEndAddOn - band->rowStartAddOn - 1);
}
int crxDecodeLineWithIQuantization(CrxSubband *band, CrxQStep *qStep)
{
  if (!band->dataSize)
  {
    memset(band->bandBuf, 0, band->bandSize);
    return 0;
  }

  if (band->supportsPartial && !qStep && crxUpdateQparam(band))
    return -1;
  if (crxDecodeLine(band->bandParam, band->bandBuf))
    return -1;

  if (band->width <= 0)
    return 0;

  // update band buffers
  int32_t *bandBuf = (int32_t *)band->bandBuf;
  if (qStep)
  {
    // new version
    uint32_t *qStepTblPtr = &qStep->qStepTbl[qStep->width * getSubbandRow(band, band->bandParam->curLine - 1)];

    for (int i = 0; i < band->colStartAddOn; ++i)
    {
      int32_t quantVal = band->qStepBase + ((qStepTblPtr[0] * band->qStepMult) >> 3);
      bandBuf[i] *= _constrain(quantVal, 1, 0x168000);
    }

    for (int i = band->colStartAddOn; i < band->width - band->colEndAddOn; ++i)
    {
      int32_t quantVal =
          band->qStepBase + ((qStepTblPtr[(i - band->colStartAddOn) >> band->levelShift] * band->qStepMult) >> 3);
      bandBuf[i] *= _constrain(quantVal, 1, 0x168000);
    }
    int lastIdx = (band->width - band->colEndAddOn - band->colStartAddOn - 1) >> band->levelShift;
    for (int i = band->width - band->colEndAddOn; i < band->width; ++i)
    {
      int32_t quantVal = band->qStepBase + ((qStepTblPtr[lastIdx] * band->qStepMult) >> 3);
      bandBuf[i] *= _constrain(quantVal, 1, 0x168000);
    }
  }
  else
  {
    // prev. version
    int32_t qScale = q_step_tbl[band->qParam % 6] >> (6 - band->qParam / 6);
    if (band->qParam / 6 >= 6)
      qScale = q_step_tbl[band->qParam % 6] * (1 << (band->qParam / 6 + 26));

    if (qScale != 1)
      for (int32_t i = 0; i < band->width; ++i)
        bandBuf[i] *= qScale;
  }

  return 0;
}

void crxHorizontal53(int32_t *lineBufLA, int32_t *lineBufLB, CrxWaveletTransform *wavelet, uint32_t tileFlag)
{
  int32_t *band0Buf = wavelet->subband0Buf;
  int32_t *band1Buf = wavelet->subband1Buf;
  int32_t *band2Buf = wavelet->subband2Buf;
  int32_t *band3Buf = wavelet->subband3Buf;

  if (wavelet->width <= 1)
  {
    lineBufLA[0] = band0Buf[0];
    lineBufLB[0] = band2Buf[0];
  }
  else
  {
    if (tileFlag & E_HAS_TILES_ON_THE_LEFT)
    {
      lineBufLA[0] = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
      lineBufLB[0] = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
      ++band1Buf;
      ++band3Buf;
    }
    else
    {
      lineBufLA[0] = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
      lineBufLB[0] = band2Buf[0] - ((band3Buf[0] + 1) >> 1);
    }
    ++band0Buf;
    ++band2Buf;

    for (int i = 0; i < wavelet->width - 3; i += 2)
    {
      int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
      lineBufLA[1] = band1Buf[0] + ((delta + lineBufLA[0]) >> 1);
      lineBufLA[2] = delta;

      delta = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
      lineBufLB[1] = band3Buf[0] + ((delta + lineBufLB[0]) >> 1);
      lineBufLB[2] = delta;

      ++band0Buf;
      ++band1Buf;
      ++band2Buf;
      ++band3Buf;
      lineBufLA += 2;
      lineBufLB += 2;
    }
    if (tileFlag & E_HAS_TILES_ON_THE_RIGHT)
    {
      int32_t deltaA = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
      lineBufLA[1] = band1Buf[0] + ((deltaA + lineBufLA[0]) >> 1);

      int32_t deltaB = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
      lineBufLB[1] = band3Buf[0] + ((deltaB + lineBufLB[0]) >> 1);

      if (wavelet->width & 1)
      {
        lineBufLA[2] = deltaA;
        lineBufLB[2] = deltaB;
      }
    }
    else if (wavelet->width & 1)
    {
      lineBufLA[1] = band1Buf[0] + ((lineBufLA[0] + band0Buf[0] - ((band1Buf[0] + 1) >> 1)) >> 1);
      lineBufLA[2] = band0Buf[0] - ((band1Buf[0] + 1) >> 1);

      lineBufLB[1] = band3Buf[0] + ((lineBufLB[0] + band2Buf[0] - ((band3Buf[0] + 1) >> 1)) >> 1);
      lineBufLB[2] = band2Buf[0] - ((band3Buf[0] + 1) >> 1);
    }
    else
    {
      lineBufLA[1] = lineBufLA[0] + band1Buf[0];
      lineBufLB[1] = lineBufLB[0] + band3Buf[0];
    }
  }
}

int32_t *crxIdwt53FilterGetLine(CrxPlaneComp *comp, int32_t level)
{
  int32_t *result = comp->wvltTransform[level]
                        .lineBuf[(comp->wvltTransform[level].fltTapH - comp->wvltTransform[level].curH + 5) % 5 + 3];
  comp->wvltTransform[level].curH--;
  return result;
}

int crxIdwt53FilterDecode(CrxPlaneComp *comp, int32_t level, CrxQStep *qStep)
{
  if (comp->wvltTransform[level].curH)
    return 0;

  CrxSubband *sband = comp->subBands + 3 * level;
  CrxQStep *qStepLevel = qStep ? qStep + level : 0;

  if (comp->wvltTransform[level].height - 3 <= comp->wvltTransform[level].curLine &&
      !(comp->tileFlag & E_HAS_TILES_ON_THE_BOTTOM))
  {
    if (comp->wvltTransform[level].height & 1)
    {
      if (level)
      {
        if (crxIdwt53FilterDecode(comp, level - 1, qStep))
          return -1;
      }
      else if (crxDecodeLineWithIQuantization(sband, qStepLevel))
        return -1;

      if (crxDecodeLineWithIQuantization(sband + 1, qStepLevel))
        return -1;
    }
  }
  else
  {
    if (level)
    {
      if (crxIdwt53FilterDecode(comp, level - 1, qStep))
        return -1;
    }
    else if (crxDecodeLineWithIQuantization(sband, qStepLevel)) // LL band
      return -1;

    if (crxDecodeLineWithIQuantization(sband + 1, qStepLevel) || // HL band
        crxDecodeLineWithIQuantization(sband + 2, qStepLevel) || // LH band
        crxDecodeLineWithIQuantization(sband + 3, qStepLevel))   // HH band
      return -1;
  }

  return 0;
}

int crxIdwt53FilterTransform(CrxPlaneComp *comp, uint32_t level)
{
  CrxWaveletTransform *wavelet = comp->wvltTransform + level;

  if (wavelet->curH)
    return 0;

  if (wavelet->curLine >= wavelet->height - 3)
  {
    if (!(comp->tileFlag & E_HAS_TILES_ON_THE_BOTTOM))
    {
      if (wavelet->height & 1)
      {
        if (level)
        {
          if (!wavelet[-1].curH)
            if (crxIdwt53FilterTransform(comp, level - 1))
              return -1;
          wavelet->subband0Buf = crxIdwt53FilterGetLine(comp, level - 1);
        }
        int32_t *band0Buf = wavelet->subband0Buf;
        int32_t *band1Buf = wavelet->subband1Buf;
        int32_t *lineBufH0 = wavelet->lineBuf[wavelet->fltTapH + 3];
        int32_t *lineBufH1 = wavelet->lineBuf[(wavelet->fltTapH + 1) % 5 + 3];
        int32_t *lineBufH2 = wavelet->lineBuf[(wavelet->fltTapH + 2) % 5 + 3];

        int32_t *lineBufL0 = wavelet->lineBuf[0];
        int32_t *lineBufL1 = wavelet->lineBuf[1];
        wavelet->lineBuf[1] = wavelet->lineBuf[2];
        wavelet->lineBuf[2] = lineBufL1;

        // process L bands
        if (wavelet->width <= 1)
        {
          lineBufL0[0] = band0Buf[0];
        }
        else
        {
          if (comp->tileFlag & E_HAS_TILES_ON_THE_LEFT)
          {
            lineBufL0[0] = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
            ++band1Buf;
          }
          else
          {
            lineBufL0[0] = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
          }
          ++band0Buf;
          for (int i = 0; i < wavelet->width - 3; i += 2)
          {
            int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
            lineBufL0[1] = band1Buf[0] + ((lineBufL0[0] + delta) >> 1);
            lineBufL0[2] = delta;
            ++band0Buf;
            ++band1Buf;
            lineBufL0 += 2;
          }
          if (comp->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
          {
            int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
            lineBufL0[1] = band1Buf[0] + ((lineBufL0[0] + delta) >> 1);
            if (wavelet->width & 1)
              lineBufL0[2] = delta;
          }
          else if (wavelet->width & 1)
          {
            int32_t delta = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
            lineBufL0[1] = band1Buf[0] + ((lineBufL0[0] + delta) >> 1);
            lineBufL0[2] = delta;
          }
          else
            lineBufL0[1] = band1Buf[0] + lineBufL0[0];
        }

        // process H bands
        lineBufL0 = wavelet->lineBuf[0];
        lineBufL1 = wavelet->lineBuf[1];
        for (int32_t i = 0; i < wavelet->width; i++)
        {
          int32_t delta = lineBufL0[i] - ((lineBufL1[i] + 1) >> 1);
          lineBufH1[i] = lineBufL1[i] + ((delta + lineBufH0[i]) >> 1);
          lineBufH2[i] = delta;
        }
        wavelet->curH += 3;
        wavelet->curLine += 3;
        wavelet->fltTapH = (wavelet->fltTapH + 3) % 5;
      }
      else
      {
        int32_t *lineBufL2 = wavelet->lineBuf[2];
        int32_t *lineBufH0 = wavelet->lineBuf[wavelet->fltTapH + 3];
        int32_t *lineBufH1 = wavelet->lineBuf[(wavelet->fltTapH + 1) % 5 + 3];
        wavelet->lineBuf[1] = lineBufL2;
        wavelet->lineBuf[2] = wavelet->lineBuf[1];

        for (int32_t i = 0; i < wavelet->width; i++)
          lineBufH1[i] = lineBufH0[i] + lineBufL2[i];

        wavelet->curH += 2;
        wavelet->curLine += 2;
        wavelet->fltTapH = (wavelet->fltTapH + 2) % 5;
      }
    }
  }
  else
  {
    if (level)
    {
      if (!wavelet[-1].curH && crxIdwt53FilterTransform(comp, level - 1))
        return -1;
      wavelet->subband0Buf = crxIdwt53FilterGetLine(comp, level - 1);
    }

    int32_t *band0Buf = wavelet->subband0Buf;
    int32_t *band1Buf = wavelet->subband1Buf;
    int32_t *band2Buf = wavelet->subband2Buf;
    int32_t *band3Buf = wavelet->subband3Buf;

    int32_t *lineBufL0 = wavelet->lineBuf[0];
    int32_t *lineBufL1 = wavelet->lineBuf[1];
    int32_t *lineBufL2 = wavelet->lineBuf[2];
    int32_t *lineBufH0 = wavelet->lineBuf[wavelet->fltTapH + 3];
    int32_t *lineBufH1 = wavelet->lineBuf[(wavelet->fltTapH + 1) % 5 + 3];
    int32_t *lineBufH2 = wavelet->lineBuf[(wavelet->fltTapH + 2) % 5 + 3];

    wavelet->lineBuf[1] = wavelet->lineBuf[2];
    wavelet->lineBuf[2] = lineBufL1;

    // process L bands
    if (wavelet->width <= 1)
    {
      lineBufL0[0] = band0Buf[0];
      lineBufL1[0] = band2Buf[0];
    }
    else
    {
      if (comp->tileFlag & E_HAS_TILES_ON_THE_LEFT)
      {
        lineBufL0[0] = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
        lineBufL1[0] = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
        ++band1Buf;
        ++band3Buf;
      }
      else
      {
        lineBufL0[0] = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
        lineBufL1[0] = band2Buf[0] - ((band3Buf[0] + 1) >> 1);
      }
      ++band0Buf;
      ++band2Buf;
      for (int i = 0; i < wavelet->width - 3; i += 2)
      {
        int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
        lineBufL0[1] = band1Buf[0] + ((delta + lineBufL0[0]) >> 1);
        lineBufL0[2] = delta;

        delta = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
        lineBufL1[1] = band3Buf[0] + ((delta + lineBufL1[0]) >> 1);
        lineBufL1[2] = delta;

        ++band0Buf;
        ++band1Buf;
        ++band2Buf;
        ++band3Buf;
        lineBufL0 += 2;
        lineBufL1 += 2;
      }
      if (comp->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
      {
        int32_t deltaA = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
        lineBufL0[1] = band1Buf[0] + ((deltaA + lineBufL0[0]) >> 1);

        int32_t deltaB = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
        lineBufL1[1] = band3Buf[0] + ((deltaB + lineBufL1[0]) >> 1);

        if (wavelet->width & 1)
        {
          lineBufL0[2] = deltaA;
          lineBufL1[2] = deltaB;
        }
      }
      else if (wavelet->width & 1)
      {
        int32_t delta = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
        lineBufL0[1] = band1Buf[0] + ((delta + lineBufL0[0]) >> 1);
        lineBufL0[2] = delta;

        delta = band2Buf[0] - ((band3Buf[0] + 1) >> 1);
        lineBufL1[1] = band3Buf[0] + ((delta + lineBufL1[0]) >> 1);
        lineBufL1[2] = delta;
      }
      else
      {
        lineBufL0[1] = lineBufL0[0] + band1Buf[0];
        lineBufL1[1] = lineBufL1[0] + band3Buf[0];
      }
    }

    // process H bands
    lineBufL0 = wavelet->lineBuf[0];
    lineBufL1 = wavelet->lineBuf[1];
    lineBufL2 = wavelet->lineBuf[2];
    for (int32_t i = 0; i < wavelet->width; i++)
    {
      int32_t delta = lineBufL0[i] - ((lineBufL2[i] + lineBufL1[i] + 2) >> 2);
      lineBufH1[i] = lineBufL1[i] + ((delta + lineBufH0[i]) >> 1);
      lineBufH2[i] = delta;
    }
    if (wavelet->curLine >= wavelet->height - 3 && wavelet->height & 1)
    {
      wavelet->curH += 3;
      wavelet->curLine += 3;
      wavelet->fltTapH = (wavelet->fltTapH + 3) % 5;
    }
    else
    {
      wavelet->curH += 2;
      wavelet->curLine += 2;
      wavelet->fltTapH = (wavelet->fltTapH + 2) % 5;
    }
  }

  return 0;
}

int crxIdwt53FilterInitialize(CrxPlaneComp *comp, int32_t level, CrxQStep *qStep)
{
  if (level == 0)
    return 0;

  for (int curLevel = 0, curBand = 0; curLevel < level; curLevel++, curBand += 3)
  {
    CrxQStep *qStepLevel = qStep ? qStep + curLevel : 0;
    CrxWaveletTransform *wavelet = comp->wvltTransform + curLevel;
    if (curLevel)
      wavelet[0].subband0Buf = crxIdwt53FilterGetLine(comp, curLevel - 1);
    else if (crxDecodeLineWithIQuantization(comp->subBands + curBand, qStepLevel))
      return -1;

    int32_t *lineBufH0 = wavelet->lineBuf[wavelet->fltTapH + 3];
    if (wavelet->height > 1)
    {
      if (crxDecodeLineWithIQuantization(comp->subBands + curBand + 1, qStepLevel) ||
          crxDecodeLineWithIQuantization(comp->subBands + curBand + 2, qStepLevel) ||
          crxDecodeLineWithIQuantization(comp->subBands + curBand + 3, qStepLevel))
        return -1;

      int32_t *lineBufL0 = wavelet->lineBuf[0];
      int32_t *lineBufL1 = wavelet->lineBuf[1];
      int32_t *lineBufL2 = wavelet->lineBuf[2];

      if (comp->tileFlag & E_HAS_TILES_ON_THE_TOP)
      {
        crxHorizontal53(lineBufL0, wavelet->lineBuf[1], wavelet, comp->tileFlag);
        if (crxDecodeLineWithIQuantization(comp->subBands + curBand + 3, qStepLevel) ||
            crxDecodeLineWithIQuantization(comp->subBands + curBand + 2, qStepLevel))
          return -1;

        int32_t *band2Buf = wavelet->subband2Buf;
        int32_t *band3Buf = wavelet->subband3Buf;

        // process L band
        if (wavelet->width <= 1)
          lineBufL2[0] = band2Buf[0];
        else
        {
          if (comp->tileFlag & E_HAS_TILES_ON_THE_LEFT)
          {
            lineBufL2[0] = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
            ++band3Buf;
          }
          else
            lineBufL2[0] = band2Buf[0] - ((band3Buf[0] + 1) >> 1);

          ++band2Buf;

          for (int i = 0; i < wavelet->width - 3; i += 2)
          {
            int32_t delta = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
            lineBufL2[1] = band3Buf[0] + ((lineBufL2[0] + delta) >> 1);
            lineBufL2[2] = delta;

            ++band2Buf;
            ++band3Buf;
            lineBufL2 += 2;
          }
          if (comp->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
          {
            int32_t delta = band2Buf[0] - ((band3Buf[0] + band3Buf[1] + 2) >> 2);
            lineBufL2[1] = band3Buf[0] + ((lineBufL2[0] + delta) >> 1);
            if (wavelet->width & 1)
              lineBufL2[2] = delta;
          }
          else if (wavelet->width & 1)
          {
            int32_t delta = band2Buf[0] - ((band3Buf[0] + 1) >> 1);

            lineBufL2[1] = band3Buf[0] + ((lineBufL2[0] + delta) >> 1);
            lineBufL2[2] = delta;
          }
          else
          {
            lineBufL2[1] = band3Buf[0] + lineBufL2[0];
          }
        }

        // process H band
        for (int32_t i = 0; i < wavelet->width; i++)
          lineBufH0[i] = lineBufL0[i] - ((lineBufL1[i] + lineBufL2[i] + 2) >> 2);
      }
      else
      {
        crxHorizontal53(lineBufL0, wavelet->lineBuf[2], wavelet, comp->tileFlag);
        for (int i = 0; i < wavelet->width; i++)
          lineBufH0[i] = lineBufL0[i] - ((lineBufL2[i] + 1) >> 1);
      }

      if (crxIdwt53FilterDecode(comp, curLevel, qStep) || crxIdwt53FilterTransform(comp, curLevel))
        return -1;
    }
    else
    {
      if (crxDecodeLineWithIQuantization(comp->subBands + curBand + 1, qStepLevel))
        return -1;

      int32_t *band0Buf = wavelet->subband0Buf;
      int32_t *band1Buf = wavelet->subband1Buf;

      // process H band
      if (wavelet->width <= 1)
        lineBufH0[0] = band0Buf[0];
      else
      {
        if (comp->tileFlag & E_HAS_TILES_ON_THE_LEFT)
        {
          lineBufH0[0] = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
          ++band1Buf;
        }
        else
          lineBufH0[0] = band0Buf[0] - ((band1Buf[0] + 1) >> 1);

        ++band0Buf;

        for (int i = 0; i < wavelet->width - 3; i += 2)
        {
          int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
          lineBufH0[1] = band1Buf[0] + ((lineBufH0[0] + delta) >> 1);
          lineBufH0[2] = delta;

          ++band0Buf;
          ++band1Buf;
          lineBufH0 += 2;
        }

        if (comp->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
        {
          int32_t delta = band0Buf[0] - ((band1Buf[0] + band1Buf[1] + 2) >> 2);
          lineBufH0[1] = band1Buf[0] + ((lineBufH0[0] + delta) >> 1);
          lineBufH0[2] = delta;
        }
        else if (wavelet->width & 1)
        {
          int32_t delta = band0Buf[0] - ((band1Buf[0] + 1) >> 1);
          lineBufH0[1] = band1Buf[0] + ((lineBufH0[0] + delta) >> 1);
          lineBufH0[2] = delta;
        }
        else
        {
          lineBufH0[1] = band1Buf[0] + lineBufH0[0];
        }
      }
      ++wavelet->curLine;
      ++wavelet->curH;
      wavelet->fltTapH = (wavelet->fltTapH + 1) % 5;
    }
  }

  return 0;
}

void crxFreeSubbandData(CrxImage *image, CrxPlaneComp *comp)
{
  if (comp->compBuf)
  {
    free(comp->compBuf);
    comp->compBuf = 0;
  }

  if (!comp->subBands)
    return;

  for (int32_t i = 0; i < image->subbandCount; i++)
  {
    if (comp->subBands[i].bandParam)
    {
      free(comp->subBands[i].bandParam);
      comp->subBands[i].bandParam = 0LL;
    }

    comp->subBands[i].bandBuf = 0;
    comp->subBands[i].bandSize = 0;
  }
}

void crxConvertPlaneLine(CrxImage *img, int imageRow, int imageCol = 0, int plane = 0, int32_t *lineData = 0,
                         int lineLength = 0)
{
  if (lineData)
  {
    uint64_t rawOffset = 4 * img->planeWidth * imageRow + 2 * imageCol;
    if (img->encType == 1)
    {
      int32_t maxVal = 1 << (img->nBits - 1);
      int32_t minVal = -maxVal;
      --maxVal;
      for (int i = 0; i < lineLength; i++)
        img->outBufs[plane][rawOffset + 2 * i] = _constrain(lineData[i], minVal, maxVal);
    }
    else if (img->encType == 3)
    {
      // copy to intermediate planeBuf
      rawOffset = plane * img->planeWidth * img->planeHeight + img->planeWidth * imageRow + imageCol;
      for (int i = 0; i < lineLength; i++)
        img->planeBuf[rawOffset + i] = lineData[i];
    }
    else if (img->nPlanes == 4)
    {
      int32_t median = 1 << (img->nBits - 1);
      int32_t maxVal = (1 << img->nBits) - 1;
      for (int i = 0; i < lineLength; i++)
        img->outBufs[plane][rawOffset + 2 * i] = _constrain(median + lineData[i], 0, maxVal);
    }
    else if (img->nPlanes == 1)
    {
      int32_t maxVal = (1 << img->nBits) - 1;
      int32_t median = 1 << (img->nBits - 1);
      rawOffset = img->planeWidth * imageRow + imageCol;
      for (int i = 0; i < lineLength; i++)
        img->outBufs[0][rawOffset + i] = _constrain(median + lineData[i], 0, maxVal);
    }
  }
  else if (img->encType == 3 && img->planeBuf)
  {
    int32_t planeSize = img->planeWidth * img->planeHeight;
    int16_t *plane0 = img->planeBuf + imageRow * img->planeWidth;
    int16_t *plane1 = plane0 + planeSize;
    int16_t *plane2 = plane1 + planeSize;
    int16_t *plane3 = plane2 + planeSize;

    int32_t median = (1 << (img->medianBits - 1)) << 10;
    int32_t maxVal = (1 << img->medianBits) - 1;
    uint32_t rawLineOffset = 4 * img->planeWidth * imageRow;

    // for this stage - all except imageRow is ignored
    for (int i = 0; i < img->planeWidth; i++)
    {
      int32_t gr = median + (plane0[i] << 10) - 168 * plane1[i] - 585 * plane3[i];
      int32_t val = 0;
      if (gr < 0)
        gr = -(((_abs(gr) + 512) >> 9) & ~1);
      else
        gr = ((_abs(gr) + 512) >> 9) & ~1;

      // Essentially R = round(median + P0 + 1.474*P3)
      val = (median + (plane0[i] << 10) + 1510 * plane3[i] + 512) >> 10;
      img->outBufs[0][rawLineOffset + 2 * i] = _constrain(val, 0, maxVal);
      // Essentially G1 = round(median + P0 + P2 - 0.164*P1 - 0.571*P3)
      val = (plane2[i] + gr + 1) >> 1;
      img->outBufs[1][rawLineOffset + 2 * i] = _constrain(val, 0, maxVal);
      // Essentially G2 = round(median + P0 - P2 - 0.164*P1 - 0.571*P3)
      val = (gr - plane2[i] + 1) >> 1;
      img->outBufs[2][rawLineOffset + 2 * i] = _constrain(val, 0, maxVal);
      // Essentially B = round(median + P0 + 1.881*P1)
      val = (median + (plane0[i] << 10) + 1927 * plane1[i] + 512) >> 10;
      img->outBufs[3][rawLineOffset + 2 * i] = _constrain(val, 0, maxVal);
    }
  }
}

int crxParamInit(CrxImage *img, CrxBandParam **param, uint64_t subbandMdatOffset, uint64_t subbandDataSize,
                 uint32_t subbandWidth, uint32_t subbandHeight, bool supportsPartial, uint32_t roundedBitsMask)
{
  int32_t progrDataSize = supportsPartial ? 0 : sizeof(int32_t) * subbandWidth;
  int32_t paramLength = 2 * subbandWidth + 4;
  uint8_t *paramBuf = 0;
#if  defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
#pragma omp critical
  {
#else
  img->input->lock();
#endif
#endif
    paramBuf = (uint8_t *)
#ifdef LIBRAW_CR3_MEMPOOL
                   img->memmgr.
#endif
               calloc(1, sizeof(CrxBandParam) + sizeof(int32_t) * paramLength + progrDataSize);

#if  defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
  }
#else
  img->input->unlock();
#endif
#endif

  if (!paramBuf)
    return -1;

  *param = (CrxBandParam *)paramBuf;

  paramBuf += sizeof(CrxBandParam);

  (*param)->paramData = (int32_t *)paramBuf;
  (*param)->nonProgrData = progrDataSize ? (*param)->paramData + paramLength : 0;
  (*param)->subbandWidth = subbandWidth;
  (*param)->subbandHeight = subbandHeight;
  (*param)->roundedBits = 0;
  (*param)->curLine = 0;
  (*param)->roundedBitsMask = roundedBitsMask;
  (*param)->supportsPartial = supportsPartial;
  (*param)->bitStream.bitData = 0;
  (*param)->bitStream.bitsLeft = 0;
  (*param)->bitStream.mdatSize = subbandDataSize;
  (*param)->bitStream.curPos = 0;
  (*param)->bitStream.curBufSize = 0;
  (*param)->bitStream.curBufOffset = subbandMdatOffset;
  (*param)->bitStream.input = img->input;

  crxFillBuffer(&(*param)->bitStream);

  return 0;
}

int crxSetupSubbandData(CrxImage *img, CrxPlaneComp *planeComp, const CrxTile *tile, uint32_t mdatOffset)
{
  long compDataSize = 0;
  long waveletDataOffset = 0;
  long compCoeffDataOffset = 0;
  int32_t toSubbands = 3 * img->levels + 1;
  int32_t transformWidth = 0;

  CrxSubband *subbands = planeComp->subBands;

  // calculate sizes
  for (int32_t subbandNum = 0; subbandNum < toSubbands; subbandNum++)
  {
    subbands[subbandNum].bandSize = subbands[subbandNum].width * sizeof(int32_t); // 4bytes
    compDataSize += subbands[subbandNum].bandSize;
  }

  if (img->levels)
  {
    int32_t encLevels = img->levels ? img->levels : 1;
    waveletDataOffset = (compDataSize + 7) & ~7;
    compDataSize = (sizeof(CrxWaveletTransform) * encLevels + waveletDataOffset + 7) & ~7;
    compCoeffDataOffset = compDataSize;

    // calc wavelet line buffer sizes (always at one level up from current)
    for (int level = 0; level < img->levels; ++level)
      if (level < img->levels - 1)
        compDataSize += 8 * sizeof(int32_t) * planeComp->subBands[3 * (level + 1) + 2].width;
      else
        compDataSize += 8 * sizeof(int32_t) * tile->width;
  }
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
#pragma omp critical
  {
#else
  img->input->lock();
#endif
#endif
    // buffer allocation
    planeComp->compBuf = (uint8_t *)
#ifdef LIBRAW_CR3_MEMPOOL
                             img->memmgr.
#endif
                         malloc(compDataSize);
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
  }
#else
  img->input->unlock();
#endif
#endif
  if (!planeComp->compBuf)
    return -1;

  // subbands buffer and sizes initialisation
  uint64_t subbandMdatOffset = img->mdatOffset + mdatOffset;
  uint8_t *subbandBuf = planeComp->compBuf;

  for (int32_t subbandNum = 0; subbandNum < toSubbands; subbandNum++)
  {
    subbands[subbandNum].bandBuf = subbandBuf;
    subbandBuf += subbands[subbandNum].bandSize;
    subbands[subbandNum].mdatOffset = subbandMdatOffset + subbands[subbandNum].dataOffset;
  }

  // wavelet data initialisation
  if (img->levels)
  {
    CrxWaveletTransform *waveletTransforms = (CrxWaveletTransform *)(planeComp->compBuf + waveletDataOffset);
    int32_t *paramData = (int32_t *)(planeComp->compBuf + compCoeffDataOffset);

    planeComp->wvltTransform = waveletTransforms;
    waveletTransforms[0].subband0Buf = (int32_t *)subbands->bandBuf;

    for (int level = 0; level < img->levels; ++level)
    {
      int32_t band = 3 * level + 1;

      if (level >= img->levels - 1)
      {
        waveletTransforms[level].height = tile->height;
        transformWidth = tile->width;
      }
      else
      {
        waveletTransforms[level].height = subbands[band + 3].height;
        transformWidth = subbands[band + 4].width;
      }
      waveletTransforms[level].width = transformWidth;
      waveletTransforms[level].lineBuf[0] = paramData;
      waveletTransforms[level].lineBuf[1] = waveletTransforms[level].lineBuf[0] + transformWidth;
      waveletTransforms[level].lineBuf[2] = waveletTransforms[level].lineBuf[1] + transformWidth;
      waveletTransforms[level].lineBuf[3] = waveletTransforms[level].lineBuf[2] + transformWidth;
      waveletTransforms[level].lineBuf[4] = waveletTransforms[level].lineBuf[3] + transformWidth;
      waveletTransforms[level].lineBuf[5] = waveletTransforms[level].lineBuf[4] + transformWidth;
      waveletTransforms[level].lineBuf[6] = waveletTransforms[level].lineBuf[5] + transformWidth;
      waveletTransforms[level].lineBuf[7] = waveletTransforms[level].lineBuf[6] + transformWidth;
      waveletTransforms[level].curLine = 0;
      waveletTransforms[level].curH = 0;
      waveletTransforms[level].fltTapH = 0;
      waveletTransforms[level].subband1Buf = (int32_t *)subbands[band].bandBuf;
      waveletTransforms[level].subband2Buf = (int32_t *)subbands[band + 1].bandBuf;
      waveletTransforms[level].subband3Buf = (int32_t *)subbands[band + 2].bandBuf;

      paramData = waveletTransforms[level].lineBuf[7] + transformWidth;
    }
  }

  // decoding params and bitstream initialisation
  for (int32_t subbandNum = 0; subbandNum < toSubbands; subbandNum++)
  {
    if (subbands[subbandNum].dataSize)
    {
      bool supportsPartial = false;
      uint32_t roundedBitsMask = 0;

      if (planeComp->supportsPartial && subbandNum == 0)
      {
        roundedBitsMask = planeComp->roundedBitsMask;
        supportsPartial = true;
      }
      if (crxParamInit(img, &subbands[subbandNum].bandParam, subbands[subbandNum].mdatOffset,
                       subbands[subbandNum].dataSize, subbands[subbandNum].width, subbands[subbandNum].height,
                       supportsPartial, roundedBitsMask))
        return -1;
    }
  }

  return 0;
}

int LibRaw::crxDecodePlane(void *p, uint32_t planeNumber)
{
  CrxImage *img = (CrxImage *)p;
  int imageRow = 0;
  for (int tRow = 0; tRow < img->tileRows; tRow++)
  {
    int imageCol = 0;
    for (int tCol = 0; tCol < img->tileCols; tCol++)
    {
      CrxTile *tile = img->tiles + tRow * img->tileCols + tCol;
      CrxPlaneComp *planeComp = tile->comps + planeNumber;
      uint64_t tileMdatOffset = tile->dataOffset + tile->mdatQPDataSize + tile->mdatExtraSize + planeComp->dataOffset;

      // decode single tile
      if (crxSetupSubbandData(img, planeComp, tile, tileMdatOffset))
        return -1;

      if (img->levels)
      {
        if (crxIdwt53FilterInitialize(planeComp, img->levels, tile->qStep))
          return -1;
        for (int i = 0; i < tile->height; ++i)
        {
          if (crxIdwt53FilterDecode(planeComp, img->levels - 1, tile->qStep) ||
              crxIdwt53FilterTransform(planeComp, img->levels - 1))
            return -1;
          int32_t *lineData = crxIdwt53FilterGetLine(planeComp, img->levels - 1);
          crxConvertPlaneLine(img, imageRow + i, imageCol, planeNumber, lineData, tile->width);
        }
      }
      else
      {
        // we have the only subband in this case
        if (!planeComp->subBands->dataSize)
        {
          memset(planeComp->subBands->bandBuf, 0, planeComp->subBands->bandSize);
          return 0;
        }

        for (int i = 0; i < tile->height; ++i)
        {
          if (crxDecodeLine(planeComp->subBands->bandParam, planeComp->subBands->bandBuf))
            return -1;
          int32_t *lineData = (int32_t *)planeComp->subBands->bandBuf;
          crxConvertPlaneLine(img, imageRow + i, imageCol, planeNumber, lineData, tile->width);
        }
      }
      imageCol += tile->width;
    }
    imageRow += img->tiles[tRow * img->tileCols].height;
  }

  return 0;
}

uint32_t crxReadQP(CrxBitstream *bitStrm, int32_t kParam)
{
  uint32_t qp = crxBitstreamGetZeros(bitStrm);
  if (qp >= 23)
    qp = crxBitstreamGetBits(bitStrm, 8);
  else if (kParam)
    qp = crxBitstreamGetBits(bitStrm, kParam) | (qp << kParam);

  return qp;
}

void crxDecodeGolombTop(CrxBitstream *bitStrm, int32_t width, int32_t *lineBuf, int32_t *kParam)
{
  lineBuf[0] = 0;
  while (width-- > 0)
  {
    lineBuf[1] = lineBuf[0];
    uint32_t qp = crxReadQP(bitStrm, *kParam);
    lineBuf[1] += -(qp & 1) ^ (qp >> 1);
    *kParam = crxPredictKParameter(*kParam, qp, 7);
    ++lineBuf;
  }
  lineBuf[1] = lineBuf[0] + 1;
}

void crxDecodeGolombNormal(CrxBitstream *bitStrm, int32_t width, int32_t *lineBuf0, int32_t *lineBuf1, int32_t *kParam)
{
  lineBuf1[0] = lineBuf0[1];
  int32_t deltaH = lineBuf0[1] - lineBuf0[0];
  while (width-- > 0)
  {
    lineBuf1[1] = crxPrediction(lineBuf1[0], lineBuf0[1], deltaH, lineBuf0[0] - lineBuf1[0]);
    uint32_t qp = crxReadQP(bitStrm, *kParam);
    lineBuf1[1] += -(qp & 1) ^ (qp >> 1);
    if (width)
    {
      deltaH = lineBuf0[2] - lineBuf0[1];
      *kParam = crxPredictKParameter(*kParam, (qp + 2 * _abs(deltaH)) >> 1, 7);
      ++lineBuf0;
    }
    else
      *kParam = crxPredictKParameter(*kParam, qp, 7);
    ++lineBuf1;
  }
  lineBuf1[1] = lineBuf1[0] + 1;
}

int crxMakeQStep(CrxImage *img, CrxTile *tile, int32_t *qpTable, uint32_t totalQP)
{
  if (img->levels > 3 || img->levels < 1)
    return -1;
  int qpWidth = (tile->width >> 3) + ((tile->width & 7) != 0);
  int qpHeight = (tile->height >> 1) + (tile->height & 1);
  int qpHeight4 = (tile->height >> 2) + ((tile->height & 3) != 0);
  int qpHeight8 = (tile->height >> 3) + ((tile->height & 7) != 0);
  uint32_t totalHeight = qpHeight;
  if (img->levels > 1)
    totalHeight += qpHeight4;
  if (img->levels > 2)
    totalHeight += qpHeight8;
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
#pragma omp critical
  {
#else
  img->input->lock();
#endif
#endif
    tile->qStep = (CrxQStep *)
#ifdef LIBRAW_CR3_MEMPOOL
                      img->memmgr.
#endif
                  malloc(totalHeight * qpWidth * sizeof(uint32_t) + img->levels * sizeof(CrxQStep));
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
  }
#else
  img->input->unlock();
#endif
#endif

  if (!tile->qStep)
    return -1;
  uint32_t *qStepTbl = (uint32_t *)(tile->qStep + img->levels);
  CrxQStep *qStep = tile->qStep;
  switch (img->levels)
  {
  case 3:
    qStep->qStepTbl = qStepTbl;
    qStep->width = qpWidth;
    qStep->height = qpHeight8;
    for (int qpRow = 0; qpRow < qpHeight8; ++qpRow)
    {
      int row0Idx = qpWidth * _min(4 * qpRow, qpHeight - 1);
      int row1Idx = qpWidth * _min(4 * qpRow + 1, qpHeight - 1);
      int row2Idx = qpWidth * _min(4 * qpRow + 2, qpHeight - 1);
      int row3Idx = qpWidth * _min(4 * qpRow + 3, qpHeight - 1);

      for (int qpCol = 0; qpCol < qpWidth; ++qpCol, ++qStepTbl)
      {
        int32_t quantVal = qpTable[row0Idx++] + qpTable[row1Idx++] + qpTable[row2Idx++] + qpTable[row3Idx++];
        // not sure about this nonsense - why is it not just avg like with 2 levels?
        quantVal = ((quantVal < 0) * 3 + quantVal) >> 2;
        if (quantVal / 6 >= 6)
          *qStepTbl = q_step_tbl[quantVal % 6] * (1 << (quantVal / 6 + 26));
        else
          *qStepTbl = q_step_tbl[quantVal % 6] >> (6 - quantVal / 6);
      }
    }
    // continue to the next level - we always decode all levels
    ++qStep;
  case 2:
    qStep->qStepTbl = qStepTbl;
    qStep->width = qpWidth;
    qStep->height = qpHeight4;
    for (int qpRow = 0; qpRow < qpHeight4; ++qpRow)
    {
      int row0Idx = qpWidth * _min(2 * qpRow, qpHeight - 1);
      int row1Idx = qpWidth * _min(2 * qpRow + 1, qpHeight - 1);

      for (int qpCol = 0; qpCol < qpWidth; ++qpCol, ++qStepTbl)
      {
        int32_t quantVal = (qpTable[row0Idx++] + qpTable[row1Idx++]) / 2;
        if (quantVal / 6 >= 6)
          *qStepTbl = q_step_tbl[quantVal % 6] * (1 << (quantVal / 6 + 26));
        else
          *qStepTbl = q_step_tbl[quantVal % 6] >> (6 - quantVal / 6);
      }
    }
    // continue to the next level - we always decode all levels
    ++qStep;
  case 1:
    qStep->qStepTbl = qStepTbl;
    qStep->width = qpWidth;
    qStep->height = qpHeight;
    for (int qpRow = 0; qpRow < qpHeight; ++qpRow)
      for (int qpCol = 0; qpCol < qpWidth; ++qpCol, ++qStepTbl, ++qpTable)
        if (*qpTable / 6 >= 6)
          *qStepTbl = q_step_tbl[*qpTable % 6] * (1 << (*qpTable / 6 + 26));
        else
          *qStepTbl = q_step_tbl[*qpTable % 6] >> (6 - *qpTable / 6);

    break;
  }
  return 0;
}

libraw_inline void crxSetupSubbandIdx(crx_data_header_t *hdr, CrxImage *img, CrxSubband *band, int level,
                                      short colStartIdx, short bandWidthExCoef, short rowStartIdx,
                                      short bandHeightExCoef)
{
  if (hdr->version == 0x200)
  {
    band->rowStartAddOn = rowStartIdx;
    band->rowEndAddOn = bandHeightExCoef;
    band->colStartAddOn = colStartIdx;
    band->colEndAddOn = bandWidthExCoef;
    band->levelShift = 3 - level;
  }
  else
  {
    band->rowStartAddOn = 0;
    band->rowEndAddOn = 0;
    band->colStartAddOn = 0;
    band->colEndAddOn = 0;
    band->levelShift = 0;
  }
}

int crxProcessSubbands(crx_data_header_t *hdr, CrxImage *img, CrxTile *tile, CrxPlaneComp *comp)
{
  CrxSubband *band = comp->subBands + img->subbandCount - 1; // set to last band
  uint32_t bandHeight = tile->height;
  uint32_t bandWidth = tile->width;
  int32_t bandWidthExCoef = 0;
  int32_t bandHeightExCoef = 0;
  if (img->levels)
  {
    // Build up subband sequences to crxDecode to a level in a header

    // Coefficient structure is a bit unclear and convoluted:
    //   3 levels max - 8 groups (for tile width rounded to 8 bytes)
    //                  of 3 band per level 4 sets of coefficients for each
    int32_t *rowExCoef = exCoefNumTbl + 0x30 * (img->levels - 1) + 6 * (tile->width & 7);
    int32_t *colExCoef = exCoefNumTbl + 0x30 * (img->levels - 1) + 6 * (tile->height & 7);
    for (int level = 0; level < img->levels; ++level)
    {
      int32_t widthOddPixel = bandWidth & 1;
      int32_t heightOddPixel = bandHeight & 1;
      bandWidth = (widthOddPixel + bandWidth) >> 1;
      bandHeight = (heightOddPixel + bandHeight) >> 1;

      int32_t bandWidthExCoef0 = 0;
      int32_t bandWidthExCoef1 = 0;
      int32_t bandHeightExCoef0 = 0;
      int32_t bandHeightExCoef1 = 0;
      int32_t colStartIdx = 0;
      int32_t rowStartIdx = 0;
      if (tile->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
      {
        bandWidthExCoef0 = rowExCoef[2 * level];
        bandWidthExCoef1 = rowExCoef[2 * level + 1];
      }
      if (tile->tileFlag & E_HAS_TILES_ON_THE_LEFT)
      {
        ++bandWidthExCoef0;
        colStartIdx = 1;
      }

      if (tile->tileFlag & E_HAS_TILES_ON_THE_BOTTOM)
      {
        bandHeightExCoef0 = colExCoef[2 * level];
        bandHeightExCoef1 = colExCoef[2 * level + 1];
      }
      if (tile->tileFlag & E_HAS_TILES_ON_THE_TOP)
      {
        ++bandHeightExCoef0;
        rowStartIdx = 1;
      }

      band[0].width = bandWidth + bandWidthExCoef0 - widthOddPixel;
      band[0].height = bandHeight + bandHeightExCoef0 - heightOddPixel;
      crxSetupSubbandIdx(hdr, img, band, level + 1, colStartIdx, bandWidthExCoef0 - colStartIdx, rowStartIdx,
                         bandHeightExCoef0 - rowStartIdx);

      band[-1].width = bandWidth + bandWidthExCoef1;
      band[-1].height = bandHeight + bandHeightExCoef0 - heightOddPixel;

      crxSetupSubbandIdx(hdr, img, band - 1, level + 1, 0, bandWidthExCoef1, rowStartIdx,
                         bandHeightExCoef0 - rowStartIdx);

      band[-2].width = bandWidth + bandWidthExCoef0 - widthOddPixel;
      band[-2].height = bandHeight + bandHeightExCoef1;
      crxSetupSubbandIdx(hdr, img, band - 2, level + 1, colStartIdx, bandWidthExCoef0 - colStartIdx, 0,
                         bandHeightExCoef1);

      band -= 3;
    }
    bandWidthExCoef = bandHeightExCoef = 0;
    if (tile->tileFlag & E_HAS_TILES_ON_THE_RIGHT)
      bandWidthExCoef = rowExCoef[2 * img->levels - 1];
    if (tile->tileFlag & E_HAS_TILES_ON_THE_BOTTOM)
      bandHeightExCoef = colExCoef[2 * img->levels - 1];
  }
  band->width = bandWidthExCoef + bandWidth;
  band->height = bandHeightExCoef + bandHeight;
  if (img->levels)
    crxSetupSubbandIdx(hdr, img, band, img->levels, 0, bandWidthExCoef, 0, bandHeightExCoef);

  return 0;
}

int crxReadSubbandHeaders(crx_data_header_t *hdr, CrxImage *img, CrxTile *tile, CrxPlaneComp *comp,
                          uint8_t **subbandMdatPtr, int32_t *mdatSize)
{
  if (!img->subbandCount)
    return 0;
  int32_t subbandOffset = 0;
  CrxSubband *band = comp->subBands;
  for (int curSubband = 0; curSubband < img->subbandCount; curSubband++, band++)
  {
    if (*mdatSize < 4)
      return -1;

    int hdrSign = LibRaw::sgetn(2, *subbandMdatPtr);
    int hdrSize = LibRaw::sgetn(2, *subbandMdatPtr + 2);
    if (*mdatSize < hdrSize + 4)
      return -1;
    if ((hdrSign != 0xFF03 || hdrSize != 8) && (hdrSign != 0xFF13 || hdrSize != 16))
      return -1;

    int32_t subbandSize = LibRaw::sgetn(4, *subbandMdatPtr + 4);

    if (curSubband != ((*subbandMdatPtr)[8] & 0xF0) >> 4)
    {
      band->dataSize = subbandSize;
      return -1;
    }

    band->dataOffset = subbandOffset;
    band->kParam = 0;
    band->bandParam = 0;
    band->bandBuf = 0;
    band->bandSize = 0;

    if (hdrSign == 0xFF03)
    {
      // old header
      uint32_t bitData = LibRaw::sgetn(4, *subbandMdatPtr + 8);
      band->dataSize = subbandSize - (bitData & 0x7FFFF);
      band->supportsPartial = bitData & 0x8000000;
      band->qParam = (bitData >> 19) & 0xFF;
      band->qStepBase = 0;
      band->qStepMult = 0;
    }
    else
    {
      // new header
      if (LibRaw::sgetn(2, *subbandMdatPtr + 8) & 0xFFF)
        // partial and qParam are not supported
        return -1;
      if (LibRaw::sgetn(2, *subbandMdatPtr + 18))
        // new header terninated by 2 zero bytes
        return -1;
      band->supportsPartial = false;
      band->qParam = 0;
      band->dataSize = subbandSize - LibRaw::sgetn(2, *subbandMdatPtr + 16);
      band->qStepBase = LibRaw::sgetn(4, *subbandMdatPtr + 12);
      ;
      band->qStepMult = LibRaw::sgetn(2, *subbandMdatPtr + 10);
      ;
    }

    subbandOffset += subbandSize;

    *subbandMdatPtr += hdrSize + 4;
    *mdatSize -= hdrSize + 4;
  }

  return 0;
}

int crxReadImageHeaders(crx_data_header_t *hdr, CrxImage *img, uint8_t *mdatPtr, int32_t mdatHdrSize)
{
  int nTiles = img->tileRows * img->tileCols;

  if (!nTiles)
    return -1;

  if (!img->tiles)
  {
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
#pragma omp critical
    {
#else
    img->input->lock();
#endif
#endif

      img->tiles = (CrxTile *)
#ifdef LIBRAW_CR3_MEMPOOL
                       img->memmgr.
#endif
                   calloc(sizeof(CrxTile) * nTiles + sizeof(CrxPlaneComp) * nTiles * img->nPlanes +
                              sizeof(CrxSubband) * nTiles * img->nPlanes * img->subbandCount,
                          1);
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
    }
#else
    img->input->unlock();
#endif
#endif

    if (!img->tiles)
      return -1;

    // memory areas in allocated chunk
    CrxTile *tile = img->tiles;
    CrxPlaneComp *comps = (CrxPlaneComp *)(tile + nTiles);
    CrxSubband *bands = (CrxSubband *)(comps + img->nPlanes * nTiles);

    for (int curTile = 0; curTile < nTiles; curTile++, tile++)
    {
      tile->tileFlag = 0; // tile neighbouring flags
      tile->tileNumber = curTile;
      tile->tileSize = 0;
      tile->comps = comps + curTile * img->nPlanes;

      if ((curTile + 1) % img->tileCols)
      {
        // not the last tile in a tile row
        tile->width = hdr->tileWidth;
        if (img->tileCols > 1)
        {
          tile->tileFlag = E_HAS_TILES_ON_THE_RIGHT;
          if (curTile % img->tileCols)
            // not the first tile in tile row
            tile->tileFlag |= E_HAS_TILES_ON_THE_LEFT;
        }
      }
      else
      {
        // last tile in a tile row
        tile->width = img->planeWidth - hdr->tileWidth * (img->tileCols - 1);
        if (img->tileCols > 1)
          tile->tileFlag = E_HAS_TILES_ON_THE_LEFT;
      }
      if (curTile < nTiles - img->tileCols)
      {
        // in first tile row
        tile->height = hdr->tileHeight;
        if (img->tileRows > 1)
        {
          tile->tileFlag |= E_HAS_TILES_ON_THE_BOTTOM;
          if (curTile >= img->tileCols)
            tile->tileFlag |= E_HAS_TILES_ON_THE_TOP;
        }
      }
      else
      {
        // non first tile row
        tile->height = img->planeHeight - hdr->tileHeight * (img->tileRows - 1);
        if (img->tileRows > 1)
          tile->tileFlag |= E_HAS_TILES_ON_THE_TOP;
      }
      if (img->nPlanes)
      {
        CrxPlaneComp *comp = tile->comps;
        CrxSubband *band = bands + curTile * img->nPlanes * img->subbandCount;

        for (int curComp = 0; curComp < img->nPlanes; curComp++, comp++)
        {
          comp->compNumber = curComp;
          comp->supportsPartial = true;
          comp->tileFlag = tile->tileFlag;
          comp->subBands = band;
          comp->compBuf = 0;
          comp->wvltTransform = 0;
          if (img->subbandCount)
          {
            for (int curBand = 0; curBand < img->subbandCount; curBand++, band++)
            {
              band->supportsPartial = false;
              band->qParam = 4;
              band->bandParam = 0;
              band->dataSize = 0;
            }
          }
        }
      }
    }
  }

  uint32_t tileOffset = 0;
  int32_t dataSize = mdatHdrSize;
  uint8_t *dataPtr = mdatPtr;
  CrxTile *tile = img->tiles;

  for (int curTile = 0; curTile < nTiles; ++curTile, ++tile)
  {
    if (dataSize < 4)
      return -1;

    int hdrSign = LibRaw::sgetn(2, dataPtr);
    int hdrSize = LibRaw::sgetn(2, dataPtr + 2);
    if ((hdrSign != 0xFF01 || hdrSize != 8) && (hdrSign != 0xFF11 || (hdrSize != 8 && hdrSize != 16)))
      return -1;
    if (dataSize < hdrSize + 4)
      return -1;
    int tailSign = LibRaw::sgetn(2, dataPtr + 10);
    if ((hdrSize == 8 && tailSign) || (hdrSize == 16 && tailSign != 0x4000))
      return -1;
    if (LibRaw::sgetn(2, dataPtr + 8) != (unsigned)curTile)
      return -1;

    dataSize -= hdrSize + 4;

    tile->tileSize = LibRaw::sgetn(4, dataPtr + 4);
    tile->dataOffset = tileOffset;
    tile->qStep = 0;
    if (hdrSize == 16)
    {
      // extended header data - terminated by 0 bytes
      if (LibRaw::sgetn(2, dataPtr + 18) != 0)
        return -1;
      tile->hasQPData = true;
      tile->mdatQPDataSize = LibRaw::sgetn(4, dataPtr + 12);
      tile->mdatExtraSize = LibRaw::sgetn(2, dataPtr + 16);
    }
    else
    {
      tile->hasQPData = false;
      tile->mdatQPDataSize = 0;
      tile->mdatExtraSize = 0;
    }

    dataPtr += hdrSize + 4;
    tileOffset += tile->tileSize;

    uint32_t compOffset = 0;
    CrxPlaneComp *comp = tile->comps;

    for (int compNum = 0; compNum < img->nPlanes; ++compNum, ++comp)
    {
      if (dataSize < 0xC)
        return -1;
      hdrSign = LibRaw::sgetn(2, dataPtr);
      hdrSize = LibRaw::sgetn(2, dataPtr + 2);
      if ((hdrSign != 0xFF02 && hdrSign != 0xFF12) || hdrSize != 8)
        return -1;
      if (compNum != dataPtr[8] >> 4)
        return -1;
      if (LibRaw::sgetn(3, dataPtr + 9) != 0)
        return -1;

      comp->compSize = LibRaw::sgetn(4, dataPtr + 4);

      int32_t compHdrRoundedBits = (dataPtr[8] >> 1) & 3;
      comp->supportsPartial = (dataPtr[8] & 8) != 0;

      comp->dataOffset = compOffset;
      comp->tileFlag = tile->tileFlag;

      compOffset += comp->compSize;
      dataSize -= 0xC;
      dataPtr += 0xC;

      comp->roundedBitsMask = 0;

      if (compHdrRoundedBits)
      {
        if (img->levels || !comp->supportsPartial)
          return -1;

        comp->roundedBitsMask = 1 << (compHdrRoundedBits - 1);
      }

      if (crxReadSubbandHeaders(hdr, img, tile, comp, &dataPtr, &dataSize) || crxProcessSubbands(hdr, img, tile, comp))
        return -1;
    }
  }

  if (hdr->version != 0x200)
    return 0;

  tile = img->tiles;
  for (int curTile = 0; curTile < nTiles; ++curTile, ++tile)
  {
    if (tile->hasQPData)
    {
      CrxBitstream bitStrm;
      bitStrm.bitData = 0;
      bitStrm.bitsLeft = 0;
      bitStrm.curPos = 0;
      bitStrm.curBufSize = 0;
      bitStrm.mdatSize = tile->mdatQPDataSize;
      bitStrm.curBufOffset = img->mdatOffset + tile->dataOffset;
      bitStrm.input = img->input;

      crxFillBuffer(&bitStrm);

      unsigned int qpWidth = (tile->width >> 3) + ((tile->width & 7) != 0);
      unsigned int qpHeight = (tile->height >> 1) + (tile->height & 1);
      unsigned long totalQP = qpHeight * qpWidth;

      try
      {
        std::vector<int32_t> qpTable(totalQP + 2 * (qpWidth + 2));
        int32_t *qpCurElem = qpTable.data();
        // 2 lines padded with extra pixels at the start and at the end
        int32_t *qpLineBuf = qpTable.data() + totalQP;
        int32_t kParam = 0;
        for (unsigned qpRow = 0; qpRow < qpHeight; ++qpRow)
        {
          int32_t *qpLine0 = qpRow & 1 ? qpLineBuf + qpWidth + 2 : qpLineBuf;
          int32_t *qpLine1 = qpRow & 1 ? qpLineBuf : qpLineBuf + qpWidth + 2;

          if (qpRow)
            crxDecodeGolombNormal(&bitStrm, qpWidth, qpLine0, qpLine1, &kParam);
          else
            crxDecodeGolombTop(&bitStrm, qpWidth, qpLine1, &kParam);

          for (unsigned qpCol = 0; qpCol < qpWidth; ++qpCol)
            *qpCurElem++ = qpLine1[qpCol + 1] + 4;
        }

        // now we read QP data - build tile QStep
        if (crxMakeQStep(img, tile, qpTable.data(), totalQP))
          return -1;
      }
      catch (...)
      {
        return -1;
      }
    }
  }

  return 0;
}

int crxSetupImageData(crx_data_header_t *hdr, CrxImage *img, int16_t *outBuf, uint64_t mdatOffset, uint32_t mdatSize,
                      uint8_t *mdatHdrPtr, int32_t mdatHdrSize)
{
  int IncrBitTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0};

  img->planeWidth = hdr->f_width;
  img->planeHeight = hdr->f_height;

  if (hdr->tileWidth < 0x16 || hdr->tileHeight < 0x16 || img->planeWidth > 0x7FFF || img->planeHeight > 0x7FFF)
    return -1;

  img->tileCols = (img->planeWidth + hdr->tileWidth - 1) / hdr->tileWidth;
  img->tileRows = (img->planeHeight + hdr->tileHeight - 1) / hdr->tileHeight;

  if (img->tileCols > 0xFF || img->tileRows > 0xFF || img->planeWidth - hdr->tileWidth * (img->tileCols - 1) < 0x16 ||
      img->planeHeight - hdr->tileHeight * (img->tileRows - 1) < 0x16)
    return -1;

  img->tiles = 0;
  img->levels = hdr->imageLevels;
  img->subbandCount = 3 * img->levels + 1; // 3 bands per level + one last LL
  img->nPlanes = hdr->nPlanes;
  img->nBits = hdr->nBits;
  img->encType = hdr->encType;
  img->samplePrecision = hdr->nBits + IncrBitTable[4 * hdr->encType + 2] + 1;
  img->mdatOffset = mdatOffset + hdr->mdatHdrSize;
  img->mdatSize = mdatSize;
  img->planeBuf = 0;
  img->outBufs[0] = img->outBufs[1] = img->outBufs[2] = img->outBufs[3] = 0;
  img->medianBits = hdr->medianBits;

  // The encoding type 3 needs all 4 planes to be decoded to generate row of
  // RGGB values. It seems to be using some other colour space for raw encoding
  // It is a massive buffer so ideallly it will need a different approach:
  // decode planes line by line and convert single line then without
  // intermediate plane buffer. At the moment though it's too many changes so
  // left as is.
  if (img->encType == 3 && img->nPlanes == 4 && img->nBits > 8)
  {
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
#pragma omp critical
    {
#else
    img->input->lock();
#endif
#endif
      img->planeBuf = (int16_t *)
#ifdef LIBRAW_CR3_MEMPOOL
                          img->memmgr.
#endif
                      malloc(img->planeHeight * img->planeWidth * img->nPlanes * ((img->samplePrecision + 7) >> 3));
#if defined(LIBRAW_CR3_MEMPOOL)
#if defined(LIBRAW_USE_OPENMP) 
    }
#else
    img->input->unlock();
#endif
#endif
    if (!img->planeBuf)
      return -1;
  }

  int32_t rowSize = 2 * img->planeWidth;

  if (img->nPlanes == 1)
    img->outBufs[0] = outBuf;
  else
    switch (hdr->cfaLayout)
    {
    case 0:
      // R G
      // G B
      img->outBufs[0] = outBuf;
      img->outBufs[1] = outBuf + 1;
      img->outBufs[2] = outBuf + rowSize;
      img->outBufs[3] = img->outBufs[2] + 1;
      break;
    case 1:
      // G R
      // B G
      img->outBufs[1] = outBuf;
      img->outBufs[0] = outBuf + 1;
      img->outBufs[3] = outBuf + rowSize;
      img->outBufs[2] = img->outBufs[3] + 1;
      break;
    case 2:
      // G B
      // R G
      img->outBufs[2] = outBuf;
      img->outBufs[3] = outBuf + 1;
      img->outBufs[0] = outBuf + rowSize;
      img->outBufs[1] = img->outBufs[0] + 1;
      break;
    case 3:
      // B G
      // G R
      img->outBufs[3] = outBuf;
      img->outBufs[2] = outBuf + 1;
      img->outBufs[1] = outBuf + rowSize;
      img->outBufs[0] = img->outBufs[1] + 1;
      break;
    }

  // read header
  return crxReadImageHeaders(hdr, img, mdatHdrPtr, mdatHdrSize);
}

int crxFreeImageData(CrxImage *img)
{
#ifdef LIBRAW_CR3_MEMPOOL
  img->memmgr.cleanup();
#else
  CrxTile *tile = img->tiles;
  int nTiles = img->tileRows * img->tileCols;

  if (img->tiles)
  {
    for (int32_t curTile = 0; curTile < nTiles; curTile++)
    {
      if (tile[curTile].comps)
        for (int32_t curPlane = 0; curPlane < img->nPlanes; curPlane++)
          crxFreeSubbandData(img, tile[curTile].comps + curPlane);
      if (tile[curTile].qStep)
        free(tile[curTile].qStep);
    }
    free(img->tiles);
    img->tiles = 0;
  }

  if (img->planeBuf)
  {
    free(img->planeBuf);
    img->planeBuf = 0;
  }
#endif
  return 0;
}
void LibRaw::crxLoadDecodeLoop(void *img, int nPlanes)
{
#ifdef LIBRAW_USE_OPENMP
  int results[4] ={0,0,0,0}; // nPlanes is always <= 4
#pragma omp parallel for
  for (int32_t plane = 0; plane < nPlanes; ++plane)
   try {
    results[plane] = crxDecodePlane(img, plane);
   } catch (...) {
    results[plane] = 1;
   }

  for (int32_t plane = 0; plane < nPlanes; ++plane)
    if (results[plane])
      derror();
#else
  for (int32_t plane = 0; plane < nPlanes; ++plane)
    if (crxDecodePlane(img, plane))
      derror();
#endif
}

void LibRaw::crxConvertPlaneLineDf(void *p, int imageRow) { crxConvertPlaneLine((CrxImage *)p, imageRow); }

void LibRaw::crxLoadFinalizeLoopE3(void *p, int planeHeight)
{
#ifdef LIBRAW_USE_OPENMP
#pragma omp parallel for
#endif
  for (int i = 0; i < planeHeight; ++i)
    crxConvertPlaneLineDf(p, i);
}

void LibRaw::crxLoadRaw()
{
  CrxImage img;
  if (libraw_internal_data.unpacker_data.crx_track_selected < 0 ||
      libraw_internal_data.unpacker_data.crx_track_selected >= LIBRAW_CRXTRACKS_MAXCOUNT)
    derror();

  crx_data_header_t hdr =
      libraw_internal_data.unpacker_data.crx_header[libraw_internal_data.unpacker_data.crx_track_selected];

  if (libraw_internal_data.unpacker_data.data_size < (unsigned)hdr.mdatHdrSize)
    derror();

  img.input = libraw_internal_data.internal_data.input;

  // update sizes for the planes
  if (hdr.nPlanes == 4)
  {
    hdr.f_width >>= 1;
    hdr.f_height >>= 1;
    hdr.tileWidth >>= 1;
    hdr.tileHeight >>= 1;
  }

  imgdata.color.maximum = (1 << hdr.nBits) - 1;

  uint8_t *hdrBuf = (uint8_t *)malloc(hdr.mdatHdrSize);

  // read image header
#ifdef LIBRAW_USE_OPENMP
#pragma omp critical
#endif
  {
#ifndef LIBRAW_USE_OPENMP
    libraw_internal_data.internal_data.input->lock();
#endif
    libraw_internal_data.internal_data.input->seek(libraw_internal_data.unpacker_data.data_offset, SEEK_SET);
    libraw_internal_data.internal_data.input->read(hdrBuf, 1, hdr.mdatHdrSize);
#ifndef LIBRAW_USE_OPENMP
    libraw_internal_data.internal_data.input->unlock();
#endif
  }

  // parse and setup the image data
  if (crxSetupImageData(&hdr, &img, (int16_t *)imgdata.rawdata.raw_image,
                        libraw_internal_data.unpacker_data.data_offset, libraw_internal_data.unpacker_data.data_size,
                        hdrBuf, hdr.mdatHdrSize))
    derror();
  free(hdrBuf);

  crxLoadDecodeLoop(&img, hdr.nPlanes);

  if (img.encType == 3)
    crxLoadFinalizeLoopE3(&img, img.planeHeight);

  crxFreeImageData(&img);
}

int LibRaw::crxParseImageHeader(uchar *cmp1TagData, int nTrack, int size)
{
  if (nTrack < 0 || nTrack >= LIBRAW_CRXTRACKS_MAXCOUNT)
    return -1;
  if (!cmp1TagData)
    return -1;

  crx_data_header_t *hdr = &libraw_internal_data.unpacker_data.crx_header[nTrack];

  hdr->version = sgetn(2, cmp1TagData + 4);
  hdr->f_width = sgetn(4, cmp1TagData + 8);
  hdr->f_height = sgetn(4, cmp1TagData + 12);
  hdr->tileWidth = sgetn(4, cmp1TagData + 16);
  hdr->tileHeight = sgetn(4, cmp1TagData + 20);
  hdr->nBits = cmp1TagData[24];
  hdr->nPlanes = cmp1TagData[25] >> 4;
  hdr->cfaLayout = cmp1TagData[25] & 0xF;
  hdr->encType = cmp1TagData[26] >> 4;
  hdr->imageLevels = cmp1TagData[26] & 0xF;
  hdr->hasTileCols = cmp1TagData[27] >> 7;
  hdr->hasTileRows = (cmp1TagData[27] >> 6) & 1;
  hdr->mdatHdrSize = sgetn(4, cmp1TagData + 28);
  int extHeader = cmp1TagData[32] >> 7;
  int useMedianBits = 0;
  hdr->medianBits = hdr->nBits;

  if (extHeader && size >= 56 && hdr->nPlanes == 4)
    useMedianBits = cmp1TagData[56] >> 6 & 1;

  if (useMedianBits && size >= 84)
    hdr->medianBits = cmp1TagData[84];

  // validation
  if ((hdr->version != 0x100 && hdr->version != 0x200) || !hdr->mdatHdrSize)
    return -1;
  if (hdr->encType == 1)
  {
    if (hdr->nBits > 15)
      return -1;
  }
  else
  {
    if (hdr->encType && hdr->encType != 3)
      return -1;
    if (hdr->nBits > 14)
      return -1;
  }

  if (hdr->nPlanes == 1)
  {
    if (hdr->cfaLayout || hdr->encType || hdr->nBits != 8)
      return -1;
  }
  else if (hdr->nPlanes != 4 || hdr->f_width & 1 || hdr->f_height & 1 || hdr->tileWidth & 1 || hdr->tileHeight & 1 ||
           hdr->cfaLayout > 3 || hdr->nBits == 8)
    return -1;

  if (hdr->tileWidth > hdr->f_width || hdr->tileHeight > hdr->f_height)
    return -1;

  if (hdr->imageLevels > 3 || hdr->hasTileCols > 1 || hdr->hasTileRows > 1)
    return -1;
  return 0;
}

#undef _abs
#undef _min
#undef _constrain
#undef libraw_inline
