/******************************************************************************
 *
 * Project:  GDAL
 * Purpose:  GDALJP2Box Implementation - Low level JP2 box reader.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2005, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2010-2012, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "gdaljp2metadata.h"

#include <cstddef>
#include <cstdio>
#include <cstring>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include <algorithm>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "cpl_vsi.h"

/*! @cond Doxygen_Suppress */

/************************************************************************/
/*                             GDALJP2Box()                             */
/************************************************************************/

// GDALJP2Box does *not* take ownership of fpIn
GDALJP2Box::GDALJP2Box(VSILFILE *fpIn) : fpVSIL(fpIn)
{
}

/************************************************************************/
/*                            ~GDALJP2Box()                             */
/************************************************************************/

GDALJP2Box::~GDALJP2Box()

{
    // Do not close fpVSIL. Ownership remains to the caller of GDALJP2Box
    // constructor
    CPLFree(pabyData);
}

/************************************************************************/
/*                             SetOffset()                              */
/************************************************************************/

int GDALJP2Box::SetOffset(GIntBig nNewOffset)

{
    szBoxType[0] = '\0';
    return VSIFSeekL(fpVSIL, nNewOffset, SEEK_SET) == 0;
}

/************************************************************************/
/*                             ReadFirst()                              */
/************************************************************************/

int GDALJP2Box::ReadFirst()

{
    return SetOffset(0) && ReadBox();
}

/************************************************************************/
/*                              ReadNext()                              */
/************************************************************************/

int GDALJP2Box::ReadNext()

{
    return SetOffset(nBoxOffset + nBoxLength) && ReadBox();
}

/************************************************************************/
/*                           ReadFirstChild()                           */
/************************************************************************/

int GDALJP2Box::ReadFirstChild(GDALJP2Box *poSuperBox)

{
    if (poSuperBox == nullptr)
        return ReadFirst();

    szBoxType[0] = '\0';
    if (!poSuperBox->IsSuperBox())
        return FALSE;

    return SetOffset(poSuperBox->nDataOffset) && ReadBox();
}

/************************************************************************/
/*                           ReadNextChild()                            */
/************************************************************************/

int GDALJP2Box::ReadNextChild(GDALJP2Box *poSuperBox)

{
    if (poSuperBox == nullptr)
        return ReadNext();

    if (!ReadNext())
        return FALSE;

    if (nBoxOffset >= poSuperBox->nBoxOffset + poSuperBox->nBoxLength)
    {
        szBoxType[0] = '\0';
        return FALSE;
    }

    return TRUE;
}

/************************************************************************/
/*                              ReadBox()                               */
/************************************************************************/

int GDALJP2Box::ReadBox()

{
    GUInt32 nLBox = 0;
    GUInt32 nTBox = 0;

    nBoxOffset = VSIFTellL(fpVSIL);

    if (VSIFReadL(&nLBox, 4, 1, fpVSIL) != 1 ||
        VSIFReadL(&nTBox, 4, 1, fpVSIL) != 1)
    {
        return FALSE;
    }

    memcpy(szBoxType, &nTBox, 4);
    szBoxType[4] = '\0';

    nLBox = CPL_MSBWORD32(nLBox);

    if (nLBox != 1)
    {
        nBoxLength = nLBox;
        nDataOffset = nBoxOffset + 8;
    }
    else
    {
        GByte abyXLBox[8] = {0};
        if (VSIFReadL(abyXLBox, 8, 1, fpVSIL) != 1)
            return FALSE;

#ifdef CPL_HAS_GINT64
        CPL_MSBPTR64(abyXLBox);
        memcpy(&nBoxLength, abyXLBox, 8);
#else
        // In case we lack a 64 bit integer type
        if (abyXLBox[0] != 0 || abyXLBox[1] != 0 || abyXLBox[2] != 0 ||
            abyXLBox[3] != 0)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Box size requires a 64 bit integer type");
            return FALSE;
        }
        CPL_MSBPTR32(abyXLBox + 4);
        memcpy(&nBoxLength, abyXLBox + 4, 4);
#endif
        if (nBoxLength < 0)
        {
            CPLDebug("GDALJP2", "Invalid length for box %s", szBoxType);
            return FALSE;
        }
        nDataOffset = nBoxOffset + 16;
    }

    if (nBoxLength == 0 && m_bAllowGetFileSize)
    {
        if (VSIFSeekL(fpVSIL, 0, SEEK_END) != 0)
            return FALSE;
        nBoxLength = VSIFTellL(fpVSIL) - nBoxOffset;
        if (VSIFSeekL(fpVSIL, nDataOffset, SEEK_SET) != 0)
            return FALSE;
    }

    if (EQUAL(szBoxType, "uuid"))
    {
        if (VSIFReadL(abyUUID, 16, 1, fpVSIL) != 1)
            return FALSE;
        nDataOffset += 16;
    }

    if (m_bAllowGetFileSize && GetDataLength() < 0)
    {
        CPLDebug("GDALJP2", "Invalid length for box %s", szBoxType);
        return FALSE;
    }

    return TRUE;
}

/************************************************************************/
/*                             IsSuperBox()                             */
/************************************************************************/

int GDALJP2Box::IsSuperBox()

{
    if (EQUAL(GetType(), "asoc") || EQUAL(GetType(), "jp2h") ||
        EQUAL(GetType(), "res ") || EQUAL(GetType(), "jumb"))
        return TRUE;

    return FALSE;
}

/************************************************************************/
/*                            ReadBoxData()                             */
/************************************************************************/

GByte *GDALJP2Box::ReadBoxData()

{
    GIntBig nDataLength = GetDataLength();
    if (nDataLength > 100 * 1024 * 1024)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Too big box : " CPL_FRMT_GIB " bytes", nDataLength);
        return nullptr;
    }

    if (VSIFSeekL(fpVSIL, nDataOffset, SEEK_SET) != 0)
        return nullptr;

    char *pszData = static_cast<char *>(
        VSI_MALLOC_VERBOSE(static_cast<int>(nDataLength) + 1));
    if (pszData == nullptr)
        return nullptr;

    if (static_cast<GIntBig>(VSIFReadL(
            pszData, 1, static_cast<int>(nDataLength), fpVSIL)) != nDataLength)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Cannot read box content");
        CPLFree(pszData);
        return nullptr;
    }

    pszData[nDataLength] = '\0';

    return reinterpret_cast<GByte *>(pszData);
}

/************************************************************************/
/*                           GetDataLength()                            */
/************************************************************************/

GIntBig GDALJP2Box::GetDataLength() const
{
    return nBoxLength - (nDataOffset - nBoxOffset);
}

/************************************************************************/
/*                            DumpReadable()                            */
/************************************************************************/

int GDALJP2Box::DumpReadable(FILE *fpOut, int nIndentLevel)

{
    if (fpOut == nullptr)
        fpOut = stdout;

    for (int i = 0; i < nIndentLevel; ++i)
        fprintf(fpOut, "  ");

    char szBuffer[128];
    CPLsnprintf(szBuffer, sizeof(szBuffer),
                "  Type=%s, Offset=" CPL_FRMT_GIB "/" CPL_FRMT_GIB
                ", Data Size=" CPL_FRMT_GIB,
                szBoxType, nBoxOffset, nDataOffset, GetDataLength());
    fprintf(fpOut, "%s", szBuffer);

    if (IsSuperBox())
    {
        fprintf(fpOut, " (super)");
    }

    fprintf(fpOut, "\n");

    if (IsSuperBox())
    {
        GDALJP2Box oSubBox(GetFILE());

        for (oSubBox.ReadFirstChild(this); strlen(oSubBox.GetType()) > 0;
             oSubBox.ReadNextChild(this))
        {
            oSubBox.DumpReadable(fpOut, nIndentLevel + 1);
        }
    }

    if (EQUAL(GetType(), "uuid"))
    {
        char *pszHex = CPLBinaryToHex(16, GetUUID());
        for (int i = 0; i < nIndentLevel; ++i)
            fprintf(fpOut, "  ");

        fprintf(fpOut, "    UUID=%s", pszHex);

        if (EQUAL(pszHex, "B14BF8BD083D4B43A5AE8CD7D5A6CE03"))
            fprintf(fpOut, " (GeoTIFF)");
        if (EQUAL(pszHex, "96A9F1F1DC98402DA7AED68E34451809"))
            fprintf(fpOut, " (MSI Worldfile)");
        if (EQUAL(pszHex, "BE7ACFCB97A942E89C71999491E3AFAC"))
            fprintf(fpOut, " (XMP)");
        CPLFree(pszHex);

        fprintf(fpOut, "\n");
    }

    return 0;
}

/************************************************************************/
/*                              SetType()                               */
/************************************************************************/

void GDALJP2Box::SetType(const char *pszType)

{
    CPLAssert(strlen(pszType) == 4);

    memcpy(szBoxType, pszType, 4);
    szBoxType[4] = '\0';
}

/************************************************************************/
/*                          GetWritableBoxData()                        */
/************************************************************************/

GByte *GDALJP2Box::GetWritableBoxData() const
{
    GByte *pabyRet =
        static_cast<GByte *>(CPLMalloc(static_cast<GUInt32>(nBoxLength)));
    const GUInt32 nLBox = CPL_MSBWORD32(static_cast<GUInt32>(nBoxLength));
    memcpy(pabyRet, &nLBox, sizeof(GUInt32));
    memcpy(pabyRet + 4, szBoxType, 4);
    memcpy(pabyRet + 8, pabyData, static_cast<GUInt32>(nBoxLength) - 8);
    return pabyRet;
}

/************************************************************************/
/*                          SetWritableData()                           */
/************************************************************************/

void GDALJP2Box::SetWritableData(int nLength, const GByte *pabyDataIn)

{
    CPLFree(pabyData);

    pabyData = static_cast<GByte *>(CPLMalloc(nLength));
    memcpy(pabyData, pabyDataIn, nLength);

    nBoxOffset = -9;  // Virtual offsets for data length computation.
    nDataOffset = -1;

    nBoxLength = 8 + nLength;
}

/************************************************************************/
/*                          AppendWritableData()                        */
/************************************************************************/

void GDALJP2Box::AppendWritableData(int nLength, const void *pabyDataIn)

{
    if (pabyData == nullptr)
    {
        nBoxOffset = -9;  // Virtual offsets for data length computation.
        nDataOffset = -1;
        nBoxLength = 8;
    }

    pabyData = static_cast<GByte *>(
        CPLRealloc(pabyData, static_cast<size_t>(GetDataLength() + nLength)));
    memcpy(pabyData + GetDataLength(), pabyDataIn, nLength);

    nBoxLength += nLength;
}

/************************************************************************/
/*                              AppendUInt32()                          */
/************************************************************************/

void GDALJP2Box::AppendUInt32(GUInt32 nVal)
{
    CPL_MSBPTR32(&nVal);
    AppendWritableData(4, &nVal);
}

/************************************************************************/
/*                              AppendUInt16()                          */
/************************************************************************/

void GDALJP2Box::AppendUInt16(GUInt16 nVal)
{
    CPL_MSBPTR16(&nVal);
    AppendWritableData(2, &nVal);
}

/************************************************************************/
/*                              AppendUInt8()                           */
/************************************************************************/

void GDALJP2Box::AppendUInt8(GByte nVal)
{
    AppendWritableData(1, &nVal);
}

/************************************************************************/
/*                           CreateUUIDBox()                            */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateUUIDBox(const GByte *pabyUUID, int nDataSize,
                                      const GByte *pabyDataIn)

{
    GDALJP2Box *const poBox = new GDALJP2Box();
    poBox->SetType("uuid");

    poBox->AppendWritableData(16, pabyUUID);
    poBox->AppendWritableData(nDataSize, pabyDataIn);

    return poBox;
}

/************************************************************************/
/*                           CreateAsocBox()                            */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateAsocBox(int nCount,
                                      const GDALJP2Box *const *papoBoxes)
{
    return CreateSuperBox("asoc", nCount, papoBoxes);
}

/************************************************************************/
/*                           CreateAsocBox()                            */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateSuperBox(const char *pszType, int nCount,
                                       const GDALJP2Box *const *papoBoxes)
{
    int nDataSize = 0;

    /* -------------------------------------------------------------------- */
    /*      Compute size of data area of asoc box.                          */
    /* -------------------------------------------------------------------- */
    for (int iBox = 0; iBox < nCount; ++iBox)
        nDataSize += 8 + static_cast<int>(papoBoxes[iBox]->GetDataLength());

    GByte *pabyNext = static_cast<GByte *>(CPLMalloc(nDataSize));
    GByte *pabyCompositeData = pabyNext;

    /* -------------------------------------------------------------------- */
    /*      Copy subboxes headers and data into buffer.                     */
    /* -------------------------------------------------------------------- */
    for (int iBox = 0; iBox < nCount; ++iBox)
    {
        GUInt32 nLBox =
            CPL_MSBWORD32(static_cast<GUInt32>(papoBoxes[iBox]->nBoxLength));
        memcpy(pabyNext, &nLBox, 4);
        pabyNext += 4;

        memcpy(pabyNext, papoBoxes[iBox]->szBoxType, 4);
        pabyNext += 4;

        memcpy(pabyNext, papoBoxes[iBox]->pabyData,
               static_cast<int>(papoBoxes[iBox]->GetDataLength()));
        pabyNext += papoBoxes[iBox]->GetDataLength();
    }

    /* -------------------------------------------------------------------- */
    /*      Create asoc box.                                                */
    /* -------------------------------------------------------------------- */
    GDALJP2Box *const poAsoc = new GDALJP2Box();

    poAsoc->SetType(pszType);
    poAsoc->SetWritableData(nDataSize, pabyCompositeData);

    CPLFree(pabyCompositeData);

    return poAsoc;
}

/************************************************************************/
/*                            CreateLblBox()                            */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateLblBox(const char *pszLabel)

{
    GDALJP2Box *const poBox = new GDALJP2Box();
    poBox->SetType("lbl ");
    poBox->SetWritableData(static_cast<int>(strlen(pszLabel) + 1),
                           reinterpret_cast<const GByte *>(pszLabel));

    return poBox;
}

/************************************************************************/
/*                       CreateLabelledXMLAssoc()                       */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateLabelledXMLAssoc(const char *pszLabel,
                                               const char *pszXML)

{
    GDALJP2Box oLabel;
    oLabel.SetType("lbl ");
    oLabel.SetWritableData(static_cast<int>(strlen(pszLabel) + 1),
                           reinterpret_cast<const GByte *>(pszLabel));

    GDALJP2Box oXML;
    oXML.SetType("xml ");
    oXML.SetWritableData(static_cast<int>(strlen(pszXML) + 1),
                         reinterpret_cast<const GByte *>(pszXML));

    GDALJP2Box *aoList[2] = {&oLabel, &oXML};

    return CreateAsocBox(2, aoList);
}

/************************************************************************/
/*                    CreateJUMBFDescriptionBox()                       */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateJUMBFDescriptionBox(const GByte *pabyUUIDType,
                                                  const char *pszLabel)

{
    GDALJP2Box *const poBox = new GDALJP2Box();
    poBox->SetType("jumd");

    poBox->AppendWritableData(16, pabyUUIDType);
    poBox->AppendUInt8(3);  // requestable field
    const size_t nLabelLen = strlen(pszLabel) + 1;
    poBox->AppendWritableData(static_cast<int>(nLabelLen), pszLabel);

    return poBox;
}

/************************************************************************/
/*                         CreateJUMBFBox()                             */
/************************************************************************/

GDALJP2Box *GDALJP2Box::CreateJUMBFBox(const GDALJP2Box *poJUMBFDescriptionBox,
                                       int nCount,
                                       const GDALJP2Box *const *papoBoxes)
{
    std::vector<const GDALJP2Box *> apoBoxes;
    apoBoxes.push_back(poJUMBFDescriptionBox);
    apoBoxes.insert(apoBoxes.end(), papoBoxes, papoBoxes + nCount);
    return CreateSuperBox("jumb", static_cast<int>(apoBoxes.size()),
                          apoBoxes.data());
}

/*! @endcond */
