/* -*- C++ -*-
 *
 *  This file is part of ART.
 *
 *  ART is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ART is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with ART.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "dcraw.h"
#include <iostream>

#if defined __GNUC__ && !defined __clang__ // silence warning
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
#endif

// Code adapted from libraw
/* -*- 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).

*/

void DCraw::parse_canon_cr3()
{
    int err;
    unsigned long long szAtomList;
    short nesting = -1;
    short nTrack = -1;
    short TrackType;
    char AtomNameStack[128];
    strcpy(make, "Canon");

    szAtomList = ifp->size;
    err = parseCR3(0ULL, szAtomList, nesting, AtomNameStack, nTrack, TrackType);
    if ((err == 0 || err == -14) &&
        nTrack >= 0) // no error, or too deep nesting
        selectCRXTrack(nTrack);
}

#define LIBRAW_CRXTRACKS_MAXCOUNT RT_canon_CR3_data.CRXTRACKS_MAXCOUNT

void DCraw::selectCRXTrack(short maxTrack)
{
    if (maxTrack < 0)
        return;
    INT64 bitcounts[LIBRAW_CRXTRACKS_MAXCOUNT], maxbitcount = 0;
    uint32_t maxjpegbytes = 0;
    memset(bitcounts, 0, sizeof(bitcounts));
    for (int i = 0; i <= maxTrack && i < LIBRAW_CRXTRACKS_MAXCOUNT; i++) {
        CanonCR3Data::crx_data_header_t *d = &RT_canon_CR3_data.crx_header[i];
        if (d->MediaType == 1) // RAW
        {
            bitcounts[i] =
                INT64(d->nBits) * INT64(d->f_width) * INT64(d->f_height);
            if (bitcounts[i] > maxbitcount)
                maxbitcount = bitcounts[i];
        } else if (d->MediaType == 2) // JPEG
        {
            if (d->MediaSize > maxjpegbytes) {
                maxjpegbytes = d->MediaSize;
                thumb_offset = d->MediaOffset;
                thumb_length = d->MediaSize;
            }
        }
    }
    if (maxbitcount < 8)
        return;
    int framei = -1, framecnt = 0;
    for (int i = 0; i <= maxTrack && i < LIBRAW_CRXTRACKS_MAXCOUNT; i++) {
        if (bitcounts[i] == maxbitcount) {
            if (framecnt <= shot_select)
                framei = i;
            framecnt++;
        }
    }
    is_raw = framecnt;
    if (framei >= 0 && framei < LIBRAW_CRXTRACKS_MAXCOUNT) {
        CanonCR3Data::crx_data_header_t *d =
            &RT_canon_CR3_data.crx_header[framei];
        data_offset = d->MediaOffset;
        // data_size = d->MediaSize;
        raw_width = d->f_width;
        raw_height = d->f_height;
        load_raw = &DCraw::crxLoadRaw;
        switch (d->cfaLayout) {
        case 0:
            filters = 0x94949494;
            break;
        case 1:
            filters = 0x61616161;
            break;
        case 2:
            filters = 0x49494949;
            break;
        case 3:
            filters = 0x16161616;
            break;
        }

        RT_canon_CR3_data.crx_track_selected = framei;

        int tiff_idx = -1;
        INT64 tpixels = 0;
        for (int i = 0; i < tiff_nifds; i++)
            if (INT64(tiff_ifd[i].height) * INT64(tiff_ifd[i].height) >
                tpixels) {
                tpixels = INT64(tiff_ifd[i].height) * INT64(tiff_ifd[i].height);
                tiff_idx = i;
            }
        if (tiff_idx >= 0)
            flip = tiff_ifd[tiff_idx].flip;
    }
}

#define FORC4 for (c = 0; c < 4; c++)

#define bad_hdr                                                                \
    (((order != 0x4d4d) && (order != 0x4949)) || (get2() != 0x002a) ||         \
     (get4() != 0x00000008))
int DCraw::parseCR3(unsigned long long oAtomList, unsigned long long szAtomList,
                    short &nesting, char *AtomNameStack, short &nTrack,
                    short &TrackType)
{
    /*
    Atom starts with 4 bytes for Atom size and 4 bytes containing Atom name
    Atom size includes the length of the header and the size of all "contained"
    Atoms if Atom size == 1, Atom has the extended size stored in 8 bytes
    located after the Atom name if Atom size == 0, it is the last top-level Atom
    extending to the end of the file Atom name is often a 4 symbol mnemonic, but
    can be a 4-byte integer
    */
    const char UIID_Canon[17] =
        "\x85\xc0\xb6\x87\x82\x0f\x11\xe0\x81\x11\xf4\xce\x46\x2b\x6a\x48";
    // const char UIID_Preview[17] =
    //     "\xea\xf4\x2b\x5e\x1c\x98\x4b\x88\xb9\xfb\xb7\xdc\x40\x6e\x4d\x16";

    /*
    AtomType = 0 - unknown: "unk."
    AtomType = 1 - container atom: "cont"
    AtomType = 2 - leaf atom: "leaf"
    AtomType = 3 - can be container, can be leaf: "both"
    */
    // const char sAtomeType[4][5] = {"unk.", "cont", "leaf", "both"};
    short AtomType;
    static const struct {
        char AtomName[5];
        short AtomType;
    } AtomNamesList[] = {
        {"dinf", 1},
        {"edts", 1},
        {"fiin", 1},
        {"ipro", 1},
        {"iprp", 1},
        {"mdia", 1},
        {"meco", 1},
        {"mere", 1},
        {"mfra", 1},
        {"minf", 1},
        {"moof", 1},
        {"moov", 1},
        {"mvex", 1},
        {"paen", 1},
        {"schi", 1},
        {"sinf", 1},
        {"skip", 1},
        {"stbl", 1},
        {"stsd", 1},
        {"strk", 1},
        {"tapt", 1},
        {"traf", 1},
        {"trak", 1},

        {"cdsc", 2},
        {"colr", 2},
        {"dimg", 2},
        // {"dref", 2},
        {"free", 2},
        {"frma", 2},
        {"ftyp", 2},
        {"hdlr", 2},
        {"hvcC", 2},
        {"iinf", 2},
        {"iloc", 2},
        {"infe", 2},
        {"ipco", 2},
        {"ipma", 2},
        {"iref", 2},
        {"irot", 2},
        {"ispe", 2},
        {"meta", 2},
        {"mvhd", 2},
        {"pitm", 2},
        {"pixi", 2},
        {"schm", 2},
        {"thmb", 2},
        {"tkhd", 2},
        {"url ", 2},
        {"urn ", 2},

        {"CCTP", 1},
        {"CRAW", 1},

        {"JPEG", 2},
        {"CDI1", 2},
        {"CMP1", 2},

        {"CNCV", 2},
        {"CCDT", 2},
        {"CTBO", 2},
        {"CMT1", 2},
        {"CMT2", 2},
        {"CMT3", 2},
        {"CMT4", 2},
        {"THMB", 2},
        {"co64", 2},
        {"mdat", 2},
        {"mdhd", 2},
        {"nmhd", 2},
        {"stsc", 2},
        {"stsz", 2},
        {"stts", 2},
        {"vmhd", 2},

        {"dref", 3},
        {"uuid", 3},
    };

    const char sHandlerType[5][5] = {"unk.", "soun", "vide", "hint", "meta"};

    int c, err = 0;

    ushort tL;                        // Atom length represented in 4 or 8 bytes
    char nmAtom[5];                   // Atom name
    unsigned long long oAtom, szAtom; // Atom offset and Atom size
    unsigned long long oAtomContent,
        szAtomContent; // offset and size of Atom content
    unsigned long long lHdr;

    char UIID[16];
    uchar CMP1[36];
    char HandlerType[5], MediaFormatID[5];
    // unsigned ImageWidth, ImageHeight;
    long relpos_inDir, relpos_inBox;
    unsigned szItem, Tag, lTag;
    ushort tItem;

    nmAtom[0] = MediaFormatID[0] = nmAtom[4] = MediaFormatID[4] = '\0';
    strcpy(HandlerType, sHandlerType[0]);
    // ImageWidth = ImageHeight = 0U;
    oAtom = oAtomList;
    nesting++;
    if (nesting > 31)
        return -14; // too deep nesting
    short s_order = order;

    while ((oAtom + 8ULL) <= (oAtomList + szAtomList)) {
        lHdr = 0ULL;
        err = 0;
        order = 0x4d4d;
        fseek(ifp, oAtom, SEEK_SET);
        szAtom = get4();
        FORC4 nmAtom[c] = AtomNameStack[nesting * 4 + c] = fgetc(ifp);
        AtomNameStack[(nesting + 1) * 4] = '\0';
        tL = 4;
        AtomType = 0;

        for (c = 0; c < sizeof AtomNamesList / sizeof *AtomNamesList; c++)
            if (!strcmp(nmAtom, AtomNamesList[c].AtomName)) {
                AtomType = AtomNamesList[c].AtomType;
                break;
            }

        if (!AtomType) {
            err = 1;
        }

        if (szAtom == 0ULL) {
            if (nesting != 0) {
                err = -2;
                goto fin;
            }
            szAtom = szAtomList - oAtom;
            oAtomContent = oAtom + 8ULL;
            szAtomContent = szAtom - 8ULL;
        } else if (szAtom == 1ULL) {
            if ((oAtom + 16ULL) > (oAtomList + szAtomList)) {
                err = -3;
                goto fin;
            }
            tL = 8;
            szAtom = (((unsigned long long)get4()) << 32) | get4();
            oAtomContent = oAtom + 16ULL;
            szAtomContent = szAtom - 16ULL;
        } else {
            oAtomContent = oAtom + 8ULL;
            szAtomContent = szAtom - 8ULL;
        }

        if (!strcmp(nmAtom, "trak")) {
            nTrack++;
            TrackType = 0;
            if (nTrack >= LIBRAW_CRXTRACKS_MAXCOUNT)
                break;
        }
        if (!strcmp(AtomNameStack, "moovuuid")) {
            lHdr = 16ULL;
            fread(UIID, 1, lHdr, ifp);
            if (!strncmp(UIID, UIID_Canon, lHdr)) {
                AtomType = 1;
            } else
                fseek(ifp, -lHdr, SEEK_CUR);
        } else if (!strcmp(AtomNameStack, "moovuuidCCTP")) {
            lHdr = 12ULL;
        } else if (!strcmp(AtomNameStack, "moovuuidCMT1")) {
            short q_order = order;
            order = get2();
            if ((tL != 4) || bad_hdr) {
                err = -4;
                goto fin;
            }
            parse_tiff_ifd(oAtomContent);
            order = q_order;
        } else if (!strcmp(AtomNameStack, "moovuuidCMT2")) {
            short q_order = order;
            order = get2();
            if ((tL != 4) || bad_hdr) {
                err = -5;
                goto fin;
            }
            parse_exif(oAtomContent);
            order = q_order;
        } else if (!strcmp(AtomNameStack, "moovuuidCMT3")) {
            short q_order = order;
            order = get2();
            if ((tL != 4) || bad_hdr) {
                err = -6;
                goto fin;
            }
            fseek(ifp, -12L, SEEK_CUR);
            parse_makernote(oAtomContent, 0);
            order = q_order;
        } else if (!strcmp(AtomNameStack, "moovuuidCMT4")) {
            short q_order = order;
            order = get2();
            if ((tL != 4) || bad_hdr) {
                err = -6;
                goto fin;
            }
            INT64 off = ftell(ifp);
            parse_gps(oAtomContent);
            fseek(ifp, off, SEEK_SET);
            //      parse_gps_libraw(oAtomContent);
            order = q_order;
        } else if (!strcmp(AtomNameStack, "moovtrakmdiahdlr")) {
            fseek(ifp, 8L, SEEK_CUR);
            FORC4 HandlerType[c] = fgetc(ifp);
            for (c = 1; c < sizeof sHandlerType / sizeof *sHandlerType; c++)
                if (!strcmp(HandlerType, sHandlerType[c])) {
                    TrackType = c;
                    break;
                }
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblstsd")) {
            if (szAtomContent >= 16) {
                fseek(ifp, 12L, SEEK_CUR);
                lHdr = 8;
            } else {
                err = -7;
                goto fin;
            }
            FORC4 MediaFormatID[c] = fgetc(ifp);
            if ((TrackType == 2) && (!strcmp(MediaFormatID, "CRAW"))) {
                if (szAtomContent >= 44)
                    fseek(ifp, 24L, SEEK_CUR);
                else {
                    err = -8;
                    goto fin;
                }
            } else {
                AtomType = 2; // only continue for CRAW
                lHdr = 0;
            }
#define current_track RT_canon_CR3_data.crx_header[nTrack]

            // ImageWidth = get2();
            // ImageHeight = get2();
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblstsdCRAW")) {
            lHdr = 82;
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblstsdCRAWCMP1")) {
            if (szAtomContent >= 40)
                fread(CMP1, 1, 36, ifp);
            else {
                err = -7;
                goto fin;
            }
            if (!crxParseImageHeader(CMP1, nTrack))
                current_track.MediaType = 1;
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblstsdCRAWJPEG")) {
            current_track.MediaType = 2;
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblstsz")) {
            if (szAtomContent == 12)
                fseek(ifp, 4L, SEEK_CUR);
            else if (szAtomContent == 16)
                fseek(ifp, 12L, SEEK_CUR);
            else {
                err = -9;
                goto fin;
            }
            current_track.MediaSize = get4();
        } else if (!strcmp(AtomNameStack, "moovtrakmdiaminfstblco64")) {
            if (szAtomContent == 16)
                fseek(ifp, 8L, SEEK_CUR);
            else {
                err = -10;
                goto fin;
            }
            current_track.MediaOffset =
                (((unsigned long long)get4()) << 32) | get4();
        }

        if (nTrack >= 0 && nTrack < LIBRAW_CRXTRACKS_MAXCOUNT &&
            current_track.MediaSize && current_track.MediaOffset &&
            ((oAtom + szAtom) >= (oAtomList + szAtomList)) &&
            !strncmp(AtomNameStack, "moovtrakmdiaminfstbl", 20)) {
            if ((TrackType == 4) && (!strcmp(MediaFormatID, "CTMD"))) {
                order = 0x4949;
                relpos_inDir = 0L;
                while (relpos_inDir + 6 < current_track.MediaSize) {
                    fseek(ifp, current_track.MediaOffset + relpos_inDir,
                          SEEK_SET);
                    szItem = get4();
                    tItem = get2();
                    if ((relpos_inDir + szItem) > current_track.MediaSize) {
                        err = -11;
                        goto fin;
                    }
                    if ((tItem == 7) || (tItem == 8) || (tItem == 9)) {
                        relpos_inBox = relpos_inDir + 12L;
                        while (relpos_inBox + 8 < relpos_inDir + szItem) {
                            fseek(ifp, current_track.MediaOffset + relpos_inBox,
                                  SEEK_SET);
                            lTag = get4();
                            Tag = get4();
                            if (lTag < 8) {
                                err = -12;
                                goto fin;
                            } else if ((relpos_inBox + lTag) >
                                       (relpos_inDir + szItem)) {
                                err = -11;
                                goto fin;
                            }
                            if ((Tag == 0x927c) &&
                                ((tItem == 7) || (tItem == 8))) {
                                fseek(ifp,
                                      current_track.MediaOffset + relpos_inBox +
                                          8L,
                                      SEEK_SET);
                                short q_order = order;
                                order = get2();
                                if (bad_hdr) {
                                    err = -13;
                                    goto fin;
                                }
                                fseek(ifp, -8L, SEEK_CUR);
                                RT_canon_CR3_data.CR3_CTMDtag = 1;
                                parse_makernote(current_track.MediaOffset +
                                                    relpos_inBox + 8,
                                                0);
                                RT_canon_CR3_data.CR3_CTMDtag = 0;
                                order = q_order;
                            }
                            relpos_inBox += lTag;
                        }
                    }

                    if (!szItem) {
                        goto fin;
                    }

                    relpos_inDir += szItem;
                }
                order = 0x4d4d;
            }
        }
#undef current_track
        if (AtomType == 1) {
            err = parseCR3(oAtomContent + lHdr, szAtomContent - lHdr, nesting,
                           AtomNameStack, nTrack, TrackType);
            if (err)
                goto fin;
        }
        oAtom += szAtom;
    }

fin:
    nesting--;
    if (nesting >= 0)
        AtomNameStack[nesting * 4] = '\0';
    order = s_order;
    return err;
}
#undef bad_hdr

//-----------------------------------------------------------------------------

#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

namespace {

// 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);
}
#define _byteswap_ulong(x) __builtin_bswap32(x)
#endif

#ifdef _OPENMP
#define LIBRAW_USE_OPENMP
#endif

#define LIBRAW_EXCEPTION_IO_EOF std::exception()

struct LibRaw_abstract_datastream {
    IMFILE *ifp;

    void lock() {}
    void unlock() {}
    void seek(int p, int how) { fseek(ifp, p, how); }
    int read(void *dst, int es, int count)
    {
        return fread(dst, es, count, ifp);
    }
};

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;
    uint32_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 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) {
            uint32_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) {
            uint32_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) {
            uint32_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->nBits - 1) << 10;
        int32_t maxVal = (1 << img->nBits) - 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;
}

static unsigned sgetn(int n, unsigned char *s)
{
    unsigned result = 0;

    while (n-- > 0) {
        result = (result << 8) | (*s++);
    }

    return result;
}

} // namespace

int DCraw::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;
}

namespace {

typedef DCraw::CanonCR3Data::crx_data_header_t crx_data_header_t;

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

        int32_t subbandSize = 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 = 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 (sgetn(2, *subbandMdatPtr + 8) & 0xFFF)
                // partial and qParam are not supported
                return -1;
            if (sgetn(2, *subbandMdatPtr + 18))
                // new header terninated by 2 zero bytes
                return -1;
            band->supportsPartial = false;
            band->qParam = 0;
            band->dataSize = subbandSize - sgetn(2, *subbandMdatPtr + 16);
            band->qStepBase = sgetn(4, *subbandMdatPtr + 12);
            ;
            band->qStepMult = 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 = sgetn(2, dataPtr);
        int hdrSize = 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 = sgetn(2, dataPtr + 10);
        if ((hdrSize == 8 && tailSign) || (hdrSize == 16 && tailSign != 0x4000))
            return -1;
        if (sgetn(2, dataPtr + 8) != (unsigned)curTile)
            return -1;

        dataSize -= hdrSize + 4;

        tile->tileSize = sgetn(4, dataPtr + 4);
        tile->dataOffset = tileOffset;
        tile->qStep = 0;
        if (hdrSize == 16) {
            // extended header data - terminated by 0 bytes
            if (sgetn(2, dataPtr + 18) != 0)
                return -1;
            tile->hasQPData = true;
            tile->mdatQPDataSize = sgetn(4, dataPtr + 12);
            tile->mdatExtraSize = 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 = sgetn(2, dataPtr);
            hdrSize = sgetn(2, dataPtr + 2);
            if ((hdrSign != 0xFF02 && hdrSign != 0xFF12) || hdrSize != 8)
                return -1;
            if (compNum != dataPtr[8] >> 4)
                return -1;
            if (sgetn(3, dataPtr + 9) != 0)
                return -1;

            comp->compSize = 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;

    // 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;
}

} // namespace

void DCraw::crxLoadDecodeLoop(void *img, int nPlanes)
{
#ifdef LIBRAW_USE_OPENMP
    int results[4]; // nPlanes is always <= 4
#pragma omp parallel for
    for (int32_t plane = 0; plane < nPlanes; ++plane)
        results[plane] = crxDecodePlane(img, plane);

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

void DCraw::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 DCraw::crxLoadRaw()
{
    // if (libraw_internal_data.unpacker_data.CR3_Version != 0x100) //??
    //	throw LIBRAW_EXCEPTION_DECODE_RAW;                       //??
    CrxImage img;
    if (RT_canon_CR3_data.crx_track_selected < 0 ||
        RT_canon_CR3_data.crx_track_selected >= LIBRAW_CRXTRACKS_MAXCOUNT)
        derror();
    crx_data_header_t hdr =
        RT_canon_CR3_data.crx_header[RT_canon_CR3_data.crx_track_selected];

    LibRaw_abstract_datastream input = {ifp};
    img.input = &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;
    tiff_bps = hdr.nBits;

    uint8_t *hdrBuf = (uint8_t *)malloc(hdr.mdatHdrSize * 2);

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

    // parse and setup the image data
    if (crxSetupImageData(&hdr, &img, (int16_t *)raw_image,
                          hdr.MediaOffset /*data_offset*/,
                          hdr.MediaSize /*RT_canon_CR3_data.data_size*/, hdrBuf,
                          hdr.mdatHdrSize * 2))
        //                        hdr.mdatHdrSize*2, hdrBuf))
        derror();
    free(hdrBuf);

    crxLoadDecodeLoop(&img, hdr.nPlanes);

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

    crxFreeImageData(&img);
}

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

    crx_data_header_t *hdr = &RT_canon_CR3_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);

    // 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
#undef LIBRAW_CRXTRACKS_MAXCOUNT

#if defined __GNUC__ && !defined __clang__ // silence warning
#pragma GCC diagnostic pop
#endif
