int32_t CFDE_TxtEdtPage::GetDisplayPos(const CFX_RectF& rtClip,
                                       FXTEXT_CHARPOS*& pCharPos,
                                       CFX_RectF* pBBox) const {
    pCharPos = FX_Alloc(FXTEXT_CHARPOS, m_nCharCount);
    int32_t nCharPosCount = 0;
    FDE_TEXTEDITPIECE* pPiece = nullptr;
    int32_t nVisualObjCount = m_PieceMassArr.GetSize();
    FXTEXT_CHARPOS* pos = pCharPos;
    CFX_RectF rtObj;
    for (int32_t i = 0; i < nVisualObjCount; i++) {
        pPiece = m_PieceMassArr.GetPtrAt(i);
        m_pTextSet->GetRect(pPiece, rtObj);
        if (!rtClip.IntersectWith(rtObj)) {
            continue;
        }
        int32_t nCount = m_pTextSet->GetDisplayPos(pPiece, pos, FALSE);
        nCharPosCount += nCount;
        pos += nCount;
    }
    if ((nCharPosCount * 5) < (m_nCharCount << 2)) {
        FXTEXT_CHARPOS* pTemp = FX_Alloc(FXTEXT_CHARPOS, nCharPosCount);
        FXSYS_memcpy(pTemp, pCharPos, sizeof(FXTEXT_CHARPOS) * nCharPosCount);
        FX_Free(pCharPos);
        pCharPos = pTemp;
    }
    return nCharPosCount;
}

FX_BOOL CPDF_ExpIntFunc::v_Init(CPDF_Object* pObj)
{
    CPDF_Dictionary* pDict = pObj->GetDict();
    if (pDict == NULL) {
        return FALSE;
    }
    CPDF_Array* pArray0 = pDict->GetArray(FX_BSTRC("C0"));
    if (m_nOutputs == 0) {
        m_nOutputs = 1;
        if (pArray0) {
            m_nOutputs = pArray0->GetCount();
        }
    }
    CPDF_Array* pArray1 = pDict->GetArray(FX_BSTRC("C1"));
    m_pBeginValues = FX_Alloc(FX_FLOAT, m_nOutputs * 2);
    m_pEndValues = FX_Alloc(FX_FLOAT, m_nOutputs * 2);
    for (int i = 0; i < m_nOutputs; i ++) {
        m_pBeginValues[i] = pArray0 ? pArray0->GetFloat(i) : 0.0f;
        m_pEndValues[i] = pArray1 ? pArray1->GetFloat(i) : 1.0f;
    }
    m_Exponent = pDict->GetFloat(FX_BSTRC("N"));
    m_nOrigOutputs = m_nOutputs;
    if (m_nOutputs && m_nInputs > INT_MAX / m_nOutputs) {
        return FALSE;
    }
    m_nOutputs *= m_nInputs;
    return TRUE;
}

void CPDF_TextObject::SetText(int nChars,
                              FX_DWORD* pCharCodes,
                              FX_FLOAT* pKernings) {
  if (m_nChars > 1) {
    FX_Free(m_pCharCodes);
    m_pCharCodes = nullptr;
  }
  FX_Free(m_pCharPos);
  m_pCharPos = nullptr;
  int nKernings = 0;
  int i;
  for (i = 0; i < nChars - 1; ++i) {
    if (pKernings[i] != 0) {
      ++nKernings;
    }
  }
  m_nChars = nChars + nKernings;
  if (m_nChars > 1) {
    m_pCharCodes = FX_Alloc(FX_DWORD, m_nChars);
    m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1);
    for (int i = 0, index = 0; i < nChars; ++i) {
      m_pCharCodes[index++] = pCharCodes[i];
      if (pKernings[i] != 0 && i != nChars - 1) {
        m_pCharCodes[index] = (FX_DWORD)-1;
        m_pCharPos[index - 1] = pKernings[i];
        ++index;
      }
    }
  } else {
    m_pCharCodes = (FX_DWORD*)(uintptr_t)pCharCodes[0];
  }
  RecalcPositionData();
}

void CPDF_TextObject::SetText(int nChars, FX_DWORD* pCharCodes, FX_FLOAT* pKernings)
{
    if (m_nChars > 1 && m_pCharCodes) {
        FX_Free(m_pCharCodes);
        m_pCharCodes = NULL;
    }
    if (m_pCharPos) {
        FX_Free(m_pCharPos);
        m_pCharPos = NULL;
    }
    int nKernings = 0;
    int i;
    for (i = 0; i < nChars - 1; i ++)
        if (pKernings[i] != 0) {
            nKernings ++;
        }
    m_nChars = nChars + nKernings;
    if (m_nChars > 1) {
        m_pCharCodes = FX_Alloc(FX_DWORD, m_nChars);
        m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1);
        int index = 0;
        for (int i = 0; i < nChars; i ++) {
            m_pCharCodes[index++] = pCharCodes[i];
            if (pKernings[i] != 0 && i != nChars - 1) {
                m_pCharCodes[index] = (FX_DWORD) - 1;
                m_pCharPos[index - 1] = pKernings[i];
                index ++;
            }
        }
    } else {
        m_pCharCodes = (FX_DWORD*)(FX_UINTPTR)pCharCodes[0];
    }
    RecalcPositionData();
}

void CPDF_TextObject::CopyData(const CPDF_PageObject* pSrc)
{
    const CPDF_TextObject* pSrcObj = (const CPDF_TextObject*)pSrc;
    if (m_nChars > 1 && m_pCharCodes) {
        FX_Free(m_pCharCodes);
        m_pCharCodes = nullptr;
    }
    if (m_pCharPos) {
        FX_Free(m_pCharPos);
        m_pCharPos = nullptr;
    }
    m_nChars = pSrcObj->m_nChars;
    if (m_nChars > 1) {
        m_pCharCodes = FX_Alloc(FX_DWORD, m_nChars);
        m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1);
        for (int i = 0; i < m_nChars; ++i) {
            m_pCharCodes[i] = pSrcObj->m_pCharCodes[i];
        }
        for (int i = 0; i < m_nChars - 1; ++i) {
            m_pCharPos[i] = pSrcObj->m_pCharPos[i];
        }
    } else {
        m_pCharCodes = pSrcObj->m_pCharCodes;
    }
    m_PosX = pSrcObj->m_PosX;
    m_PosY = pSrcObj->m_PosY;
}

FX_BOOL CPDF_SampledFunc::v_Init(CPDF_Object* pObj) {
  if (pObj->GetType() != PDFOBJ_STREAM) {
    return FALSE;
  }
  CPDF_Stream* pStream = (CPDF_Stream*)pObj;
  CPDF_Dictionary* pDict = pStream->GetDict();
  CPDF_Array* pSize = pDict->GetArray(FX_BSTRC("Size"));
  CPDF_Array* pEncode = pDict->GetArray(FX_BSTRC("Encode"));
  CPDF_Array* pDecode = pDict->GetArray(FX_BSTRC("Decode"));
  m_nBitsPerSample = pDict->GetInteger(FX_BSTRC("BitsPerSample"));
  if (m_nBitsPerSample > 32) {
    return FALSE;
  }
  m_SampleMax = 0xffffffff >> (32 - m_nBitsPerSample);
  m_pSampleStream = new CPDF_StreamAcc;
  m_pSampleStream->LoadAllData(pStream, FALSE);
  m_pEncodeInfo = FX_Alloc(SampleEncodeInfo, m_nInputs);
  FX_SAFE_DWORD nTotalSampleBits = 1;
  for (int i = 0; i < m_nInputs; i++) {
    m_pEncodeInfo[i].sizes = pSize ? pSize->GetInteger(i) : 0;
    if (!pSize && i == 0) {
      m_pEncodeInfo[i].sizes = pDict->GetInteger(FX_BSTRC("Size"));
    }
    nTotalSampleBits *= m_pEncodeInfo[i].sizes;
    if (pEncode) {
      m_pEncodeInfo[i].encode_min = pEncode->GetFloat(i * 2);
      m_pEncodeInfo[i].encode_max = pEncode->GetFloat(i * 2 + 1);
    } else {
      m_pEncodeInfo[i].encode_min = 0;
      if (m_pEncodeInfo[i].sizes == 1) {
        m_pEncodeInfo[i].encode_max = 1;
      } else {
        m_pEncodeInfo[i].encode_max = (FX_FLOAT)m_pEncodeInfo[i].sizes - 1;
      }
    }
  }
  nTotalSampleBits *= m_nBitsPerSample;
  nTotalSampleBits *= m_nOutputs;
  FX_SAFE_DWORD nTotalSampleBytes = nTotalSampleBits;
  nTotalSampleBytes += 7;
  nTotalSampleBytes /= 8;
  if (!nTotalSampleBytes.IsValid() || nTotalSampleBytes.ValueOrDie() == 0 ||
      nTotalSampleBytes.ValueOrDie() > m_pSampleStream->GetSize()) {
    return FALSE;
  }
  m_pDecodeInfo = FX_Alloc(SampleDecodeInfo, m_nOutputs);
  for (int i = 0; i < m_nOutputs; i++) {
    if (pDecode) {
      m_pDecodeInfo[i].decode_min = pDecode->GetFloat(2 * i);
      m_pDecodeInfo[i].decode_max = pDecode->GetFloat(2 * i + 1);
    } else {
      m_pDecodeInfo[i].decode_min = m_pRanges[i * 2];
      m_pDecodeInfo[i].decode_max = m_pRanges[i * 2 + 1];
    }
  }
  return TRUE;
}

void CPDF_TextRenderer::DrawTextString(CFX_RenderDevice* pDevice,
                                       FX_FLOAT origin_x,
                                       FX_FLOAT origin_y,
                                       CPDF_Font* pFont,
                                       FX_FLOAT font_size,
                                       const CFX_AffineMatrix* pMatrix,
                                       const CFX_ByteString& str,
                                       FX_ARGB fill_argb,
                                       FX_ARGB stroke_argb,
                                       const CFX_GraphStateData* pGraphState,
                                       const CPDF_RenderOptions* pOptions) {
  int nChars = pFont->CountChar(str, str.GetLength());
  if (nChars == 0) {
    return;
  }
  FX_DWORD charcode;
  int offset = 0;
  FX_DWORD* pCharCodes;
  FX_FLOAT* pCharPos;
  if (nChars == 1) {
    charcode = pFont->GetNextChar(str, str.GetLength(), offset);
    pCharCodes = (FX_DWORD*)(uintptr_t)charcode;
    pCharPos = NULL;
  } else {
    pCharCodes = FX_Alloc(FX_DWORD, nChars);
    pCharPos = FX_Alloc(FX_FLOAT, nChars - 1);
    FX_FLOAT cur_pos = 0;
    for (int i = 0; i < nChars; i++) {
      pCharCodes[i] = pFont->GetNextChar(str, str.GetLength(), offset);
      if (i) {
        pCharPos[i - 1] = cur_pos;
      }
      cur_pos += pFont->GetCharWidthF(pCharCodes[i]) * font_size / 1000;
    }
  }
  CFX_AffineMatrix matrix;
  if (pMatrix) {
    matrix = *pMatrix;
  }
  matrix.e = origin_x;
  matrix.f = origin_y;
  if (pFont->GetFontType() == PDFFONT_TYPE3)
    ;
  else if (stroke_argb == 0) {
    DrawNormalText(pDevice, nChars, pCharCodes, pCharPos, pFont, font_size,
                   &matrix, fill_argb, pOptions);
  } else
    DrawTextPath(pDevice, nChars, pCharCodes, pCharPos, pFont, font_size,
                 &matrix, NULL, pGraphState, fill_argb, stroke_argb, NULL);
  if (nChars > 1) {
    FX_Free(pCharCodes);
    FX_Free(pCharPos);
  }
}

CFX_SAXReader::CFX_SAXReader()
    : m_File(),
      m_pHandler(nullptr),
      m_iState(-1),
      m_pRoot(nullptr),
      m_pCurItem(nullptr),
      m_dwItemID(0),
      m_iDataSize(256),
      m_iNameSize(256),
      m_dwParseMode(0),
      m_pCommentContext(nullptr) {
  m_pszData = FX_Alloc(uint8_t, m_iDataSize);
  m_pszName = FX_Alloc(uint8_t, m_iNameSize);
}

void* CPDF_CryptoHandler::CryptStart(uint32_t objnum,
                                     uint32_t gennum,
                                     bool bEncrypt) {
  if (m_Cipher == FXCIPHER_NONE) {
    return this;
  }
  if (m_Cipher == FXCIPHER_AES && m_KeyLen == 32) {
    AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1);
    pContext->m_bIV = true;
    pContext->m_BlockOffset = 0;
    CRYPT_AESSetKey(pContext->m_Context, 16, m_EncryptKey, 32, bEncrypt);
    if (bEncrypt) {
      for (int i = 0; i < 16; i++) {
        pContext->m_Block[i] = (uint8_t)rand();
      }
      CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block);
    }
    return pContext;
  }
  uint8_t key1[48];
  PopulateKey(objnum, gennum, key1);

  if (m_Cipher == FXCIPHER_AES) {
    FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4);
  }
  uint8_t realkey[16];
  CRYPT_MD5Generate(
      key1, m_Cipher == FXCIPHER_AES ? m_KeyLen + 9 : m_KeyLen + 5, realkey);
  int realkeylen = m_KeyLen + 5;
  if (realkeylen > 16) {
    realkeylen = 16;
  }
  if (m_Cipher == FXCIPHER_AES) {
    AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1);
    pContext->m_bIV = true;
    pContext->m_BlockOffset = 0;
    CRYPT_AESSetKey(pContext->m_Context, 16, realkey, 16, bEncrypt);
    if (bEncrypt) {
      for (int i = 0; i < 16; i++) {
        pContext->m_Block[i] = (uint8_t)rand();
      }
      CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block);
    }
    return pContext;
  }
  CRYPT_rc4_context* pContext = FX_Alloc(CRYPT_rc4_context, 1);
  CRYPT_ArcFourSetup(pContext, realkey, realkeylen);
  return pContext;
}

void CPDF_StandardSecurityHandler::AES256_SetPerms(CPDF_Dictionary* pEncryptDict, FX_DWORD permissions,
        FX_BOOL bEncryptMetadata, FX_LPCBYTE key)
{
    FX_BYTE buf[16];
    buf[0] = (FX_BYTE)permissions;
    buf[1] = (FX_BYTE)(permissions >> 8);
    buf[2] = (FX_BYTE)(permissions >> 16);
    buf[3] = (FX_BYTE)(permissions >> 24);
    buf[4] = 0xff;
    buf[5] = 0xff;
    buf[6] = 0xff;
    buf[7] = 0xff;
    buf[8] = bEncryptMetadata ? 'T' : 'F';
    buf[9] = 'a';
    buf[10] = 'd';
    buf[11] = 'b';
    FX_BYTE* aes = FX_Alloc(FX_BYTE, 2048);
    CRYPT_AESSetKey(aes, 16, key, 32, TRUE);
    FX_BYTE iv[16], buf1[16];
    FXSYS_memset32(iv, 0, 16);
    CRYPT_AESSetIV(aes, iv);
    CRYPT_AESEncrypt(aes, buf1, buf, 16);
    FX_Free(aes);
    pEncryptDict->SetAtString(FX_BSTRC("Perms"), CFX_ByteString(buf1, 16));
}

FX_BOOL CCodec_RLScanlineDecoder::Create(const uint8_t* src_buf,
                                         FX_DWORD src_size,
                                         int width,
                                         int height,
                                         int nComps,
                                         int bpc) {
  m_pSrcBuf = src_buf;
  m_SrcSize = src_size;
  m_OutputWidth = m_OrigWidth = width;
  m_OutputHeight = m_OrigHeight = height;
  m_nComps = nComps;
  m_bpc = bpc;
  m_bColorTransformed = FALSE;
  m_DownScale = 1;
  // Aligning the pitch to 4 bytes requires an integer overflow check.
  FX_SAFE_DWORD pitch = width;
  pitch *= nComps;
  pitch *= bpc;
  pitch += 31;
  pitch /= 32;
  pitch *= 4;
  if (!pitch.IsValid()) {
    return FALSE;
  }
  m_Pitch = pitch.ValueOrDie();
  // Overflow should already have been checked before this is called.
  m_dwLineBytes = (static_cast<FX_DWORD>(width) * nComps * bpc + 7) / 8;
  m_pScanline = FX_Alloc(uint8_t, m_Pitch);
  return CheckDestSize();
}

void CPDF_PageRenderCache::CacheOptimization(FX_INT32 dwLimitCacheSize)
{
    if (m_nCacheSize <= (FX_DWORD)dwLimitCacheSize) {
        return;
    }
    int nCount = m_ImageCaches.GetCount();
    CACHEINFO* pCACHEINFO = (CACHEINFO*)FX_Alloc(FX_BYTE, (sizeof (CACHEINFO)) * nCount);
    FX_POSITION pos = m_ImageCaches.GetStartPosition();
    int i = 0;
    while (pos) {
        FX_LPVOID key, value;
        m_ImageCaches.GetNextAssoc(pos, key, value);
        pCACHEINFO[i].time = ((CPDF_ImageCache*)value)->GetTimeCount();
        pCACHEINFO[i++].pStream = ((CPDF_ImageCache*)value)->GetStream();
    }
    FXSYS_qsort(pCACHEINFO, nCount, sizeof (CACHEINFO), compare);
    FX_DWORD nTimeCount = m_nTimeCount;
    if (nTimeCount + 1 < nTimeCount) {
        for (i = 0; i < nCount; i ++) {
            ((CPDF_ImageCache*)(m_ImageCaches[pCACHEINFO[i].pStream]))->m_dwTimeCount = i;
        }
        m_nTimeCount = nCount;
    }
    i = 0;
    while(nCount > 15) {
        ClearImageCache(pCACHEINFO[i++].pStream);
        nCount--;
    }
    while (m_nCacheSize > (FX_DWORD)dwLimitCacheSize) {
        ClearImageCache(pCACHEINFO[i++].pStream);
    }
    FX_Free(pCACHEINFO);
}

void CPDF_Stream::SetData(FX_LPCBYTE pData, FX_DWORD size, FX_BOOL bCompressed, FX_BOOL bKeepBuf)
{
    if (m_GenNum == (FX_DWORD) - 1) {
        if (m_pDataBuf) {
            FX_Free(m_pDataBuf);
        }
    } else {
        m_GenNum = (FX_DWORD) - 1;
        m_pCryptoHandler = NULL;
    }
    if (bKeepBuf) {
        m_pDataBuf = (FX_LPBYTE)pData;
    } else {
        m_pDataBuf = FX_Alloc(FX_BYTE, size);
        if (pData) {
            FXSYS_memcpy32(m_pDataBuf, pData, size);
        }
    }
    m_dwSize = size;
    if (m_pDict == NULL) {
        m_pDict = new CPDF_Dictionary;
    }
    m_pDict->SetAtInteger(FX_BSTRC("Length"), size);
    if (!bCompressed) {
        m_pDict->RemoveAt(FX_BSTRC("Filter"));
        m_pDict->RemoveAt(FX_BSTRC("DecodeParms"));
    }
}

FX_BOOL FX_File_Copy(FX_BSTR fileNameSrc, FX_BSTR fileNameDst)
{
    CFXCRT_FileAccess_CRT src, dst;
    if (!src.Open(fileNameSrc, FX_FILEMODE_ReadOnly)) {
        return FALSE;
    }
    FX_FILESIZE size = src.GetSize();
    if (!size) {
        return FALSE;
    }
    if (!dst.Open(fileNameDst, FX_FILEMODE_Truncate)) {
        return FALSE;
    }
    FX_FILESIZE num = 0;
    FX_LPBYTE pBuffer = FX_Alloc(FX_BYTE, 32768);
    if (!pBuffer) {
        return FALSE;
    }
    while (num = src.Read(pBuffer, 32768)) {
        if (dst.Write(pBuffer, num) != num) {
            break;
        }
    }
    FX_Free(pBuffer);
    return TRUE;
}

void CPDF_Stream::SetData(const uint8_t* pData,
                          uint32_t size,
                          FX_BOOL bCompressed,
                          FX_BOOL bKeepBuf) {
  if (IsMemoryBased())
    FX_Free(m_pDataBuf);
  m_GenNum = kMemoryBasedGenNum;

  if (bKeepBuf) {
    m_pDataBuf = const_cast<uint8_t*>(pData);
  } else {
    m_pDataBuf = FX_Alloc(uint8_t, size);
    if (pData) {
      FXSYS_memcpy(m_pDataBuf, pData, size);
    }
  }
  m_dwSize = size;
  if (!m_pDict)
    m_pDict = new CPDF_Dictionary;
  m_pDict->SetAtInteger("Length", size);
  if (!bCompressed) {
    m_pDict->RemoveAt("Filter");
    m_pDict->RemoveAt("DecodeParms");
  }
}

void CPDF_PageRenderCache::CacheOptimization(int32_t dwLimitCacheSize) {
  if (m_nCacheSize <= (uint32_t)dwLimitCacheSize)
    return;

  size_t nCount = m_ImageCache.size();
  CACHEINFO* pCACHEINFO = FX_Alloc(CACHEINFO, nCount);
  size_t i = 0;
  for (const auto& it : m_ImageCache) {
    pCACHEINFO[i].time = it.second->GetTimeCount();
    pCACHEINFO[i++].pStream = it.second->GetStream();
  }
  FXSYS_qsort(pCACHEINFO, nCount, sizeof(CACHEINFO), compare);
  uint32_t nTimeCount = m_nTimeCount;

  // Check if time value is about to roll over and reset all entries.
  // The comparision is legal because uint32_t is an unsigned type.
  if (nTimeCount + 1 < nTimeCount) {
    for (i = 0; i < nCount; i++)
      m_ImageCache[pCACHEINFO[i].pStream]->m_dwTimeCount = i;
    m_nTimeCount = nCount;
  }

  i = 0;
  while (i + 15 < nCount)
    ClearImageCacheEntry(pCACHEINFO[i++].pStream);

  while (i < nCount && m_nCacheSize > (uint32_t)dwLimitCacheSize)
    ClearImageCacheEntry(pCACHEINFO[i++].pStream);

  FX_Free(pCACHEINFO);
}

void CFX_BinaryBuf::ExpandBuf(FX_STRSIZE add_size)
{
    FX_STRSIZE new_size = add_size + m_DataSize;
    if (m_AllocSize >= new_size) {
        return;
    }
    int alloc_step;
    if (m_AllocStep == 0) {
        alloc_step = m_AllocSize / 4;
        if (alloc_step < 128 ) {
            alloc_step = 128;
        }
    } else {
        alloc_step = m_AllocStep;
    }
    new_size = (new_size + alloc_step - 1) / alloc_step * alloc_step;
    uint8_t* pNewBuffer = m_pBuffer;
    if (pNewBuffer) {
        pNewBuffer = FX_Realloc(uint8_t, m_pBuffer, new_size);
    } else {
        pNewBuffer = FX_Alloc(uint8_t, new_size);
    }
    m_pBuffer = pNewBuffer;
    m_AllocSize = new_size;
}

FX_BOOL CFX_SAXFile::StartFile(IFX_FileRead* pFile,
                               FX_DWORD dwStart,
                               FX_DWORD dwLen) {
  FXSYS_assert(m_pFile == NULL && pFile != NULL);
  FX_DWORD dwSize = pFile->GetSize();
  if (dwStart >= dwSize) {
    return FALSE;
  }
  if (dwLen == -1 || dwStart + dwLen > dwSize) {
    dwLen = dwSize - dwStart;
  }
  if (dwLen == 0) {
    return FALSE;
  }
  m_dwBufSize = std::min(dwLen, kSaxFileBufSize);
  m_pBuf = FX_Alloc(uint8_t, m_dwBufSize);
  if (!pFile->ReadBlock(m_pBuf, dwStart, m_dwBufSize)) {
    return FALSE;
  }
  m_dwStart = dwStart;
  m_dwEnd = dwStart + dwLen;
  m_dwCur = dwStart;
  m_pFile = pFile;
  m_dwBufIndex = 0;
  return TRUE;
}

FX_DWORD _DecodeAllScanlines(ICodec_ScanlineDecoder* pDecoder, FX_LPBYTE& dest_buf, FX_DWORD& dest_size)
{
    if (pDecoder == NULL) {
        return (FX_DWORD) - 1;
    }
    int ncomps = pDecoder->CountComps();
    int bpc = pDecoder->GetBPC();
    int width = pDecoder->GetWidth();
    int height = pDecoder->GetHeight();
    int pitch = (width * ncomps * bpc + 7) / 8;
    if (height == 0 || pitch > (1 << 30) / height) {
        delete pDecoder;
        return -1;
    }
    dest_size = pitch * height;
    dest_buf = FX_Alloc( FX_BYTE, dest_size);
    for (int row = 0; row < height; row ++) {
        FX_LPBYTE pLine = pDecoder->GetScanline(row);
        if (pLine == NULL) {
            break;
        }
        FXSYS_memcpy32(dest_buf + row * pitch, pLine, pitch);
    }
    FX_DWORD srcoff = pDecoder->GetSrcOffset();
    delete pDecoder;
    return srcoff;
}

void CFX_FolderFontInfo::ScanFile(CFX_ByteString& path)
{
    FXSYS_FILE* pFile = FXSYS_fopen(path, "rb");
    if (pFile == NULL) {
        return;
    }
    FXSYS_fseek(pFile, 0, FXSYS_SEEK_END);
    FX_DWORD filesize = FXSYS_ftell(pFile);
    FX_BYTE buffer[16];
    FXSYS_fseek(pFile, 0, FXSYS_SEEK_SET);
    size_t readCnt = FXSYS_fread(buffer, 12, 1, pFile);
    if (GET_TT_LONG(buffer) == 0x74746366) {
        FX_DWORD nFaces = GET_TT_LONG(buffer + 8);
        FX_LPBYTE offsets = FX_Alloc(FX_BYTE, nFaces * 4);
        if (!offsets) {
            FXSYS_fclose(pFile);
            return;
        }
        readCnt = FXSYS_fread(offsets, nFaces * 4, 1, pFile);
        for (FX_DWORD i = 0; i < nFaces; i ++) {
            FX_LPBYTE p = offsets + i * 4;
            ReportFace(path, pFile, filesize, GET_TT_LONG(p));
        }
        FX_Free(offsets);
    } else {
        ReportFace(path, pFile, filesize, 0);
    }
    FXSYS_fclose(pFile);
}