Class ImageFileDirectoryParser

constructor

• new ImageFileDirectoryParser(
      source: BaseSource,
      littleEndian: boolean,
      bigTiff: boolean,
      eager?: boolean,
  ): ImageFileDirectoryParser

  Parameters

  • source: BaseSource

    the data source to fetch from

  • littleEndian: boolean

    the endianness of the file

  • bigTiff: boolean

    whether the file is a BigTIFF

  • Optionaleager: boolean = false

    whether to eagerly fetch deferred fields. When false (default), tags are loaded lazily on-demand. When true, all tags are loaded immediately during parsing.

  Returns ImageFileDirectoryParser

bigTiff

eager

littleEndian

source

getSlice

• getSlice(offset: number, length?: number): Promise<default>

  Helper function to retrieve a DataSlice from the source.

  Parameters

  • offset: number

    Byte offset of the slice

  • Optionallength: number

    Length of the slice

  Returns Promise<default>

parseFileDirectoryAt

• parseFileDirectoryAt(offset: number): Promise<ImageFileDirectory>

  Instructs to parse an image file directory at the given file offset. As there is no way to ensure that a location is indeed the start of an IFD, this function must be called with caution (e.g only using the IFD offsets from the headers or other IFDs).

  Parameters

  • offset: number

    the offset to parse the IFD at

  Returns Promise<ImageFileDirectory>

  the parsed IFD