Function DecodeEXRImage

tutorials/common/image/tinyexr.h:5974–6163

}

static int DecodeEXRImage(EXRImage *exr_image, const EXRHeader *exr_header,
                          const unsigned char *head,
                          const unsigned char *marker, const size_t size,
                          const char **err) {
  if (exr_image == NULL || exr_header == NULL || head == NULL ||
      marker == NULL || (size <= tinyexr::kEXRVersionSize)) {
    tinyexr::SetErrorMessage("Invalid argument for DecodeEXRImage().", err);
    return TINYEXR_ERROR_INVALID_ARGUMENT;
  }

  int num_scanline_blocks = 1;
  if (exr_header->compression_type == TINYEXR_COMPRESSIONTYPE_ZIP) {
    num_scanline_blocks = 16;
  } else if (exr_header->compression_type == TINYEXR_COMPRESSIONTYPE_PIZ) {
    num_scanline_blocks = 32;
  } else if (exr_header->compression_type == TINYEXR_COMPRESSIONTYPE_ZFP) {
    num_scanline_blocks = 16;
  }

  if (exr_header->data_window.max_x < exr_header->data_window.min_x ||
      exr_header->data_window.max_x - exr_header->data_window.min_x ==
          std::numeric_limits<int>::max()) {
    // Issue 63
    tinyexr::SetErrorMessage("Invalid data width value", err);
    return TINYEXR_ERROR_INVALID_DATA;
  }
  tinyexr_int64 data_width =
      static_cast<tinyexr_int64>(exr_header->data_window.max_x) - static_cast<tinyexr_int64>(exr_header->data_window.min_x) + static_cast<tinyexr_int64>(1);
  if (data_width <= 0) {
    tinyexr::SetErrorMessage("Invalid data window width value", err);
    return TINYEXR_ERROR_INVALID_DATA;
  }

  if (exr_header->data_window.max_y < exr_header->data_window.min_y ||
      exr_header->data_window.max_y - exr_header->data_window.min_y ==
          std::numeric_limits<int>::max()) {
    tinyexr::SetErrorMessage("Invalid data height value", err);
    return TINYEXR_ERROR_INVALID_DATA;
  }
  tinyexr_int64 data_height =
      static_cast<tinyexr_int64>(exr_header->data_window.max_y) - static_cast<tinyexr_int64>(exr_header->data_window.min_y) + static_cast<tinyexr_int64>(1);

  if (data_height <= 0) {
    tinyexr::SetErrorMessage("Invalid data window height value", err);
    return TINYEXR_ERROR_INVALID_DATA;
  }

  // Do not allow too large data_width and data_height. header invalid?
  {
    if (data_width > TINYEXR_DIMENSION_THRESHOLD) {
      tinyexr::SetErrorMessage("data width too large.", err);
      return TINYEXR_ERROR_INVALID_DATA;
    }
    if (data_height > TINYEXR_DIMENSION_THRESHOLD) {
      tinyexr::SetErrorMessage("data height too large.", err);
      return TINYEXR_ERROR_INVALID_DATA;
    }
  }