exif: JavaScript parsing library

This page hosts a formal specification of exif using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Usage

Runtime library

All parsing code for JavaScript generated by Kaitai Struct depends on the JavaScript runtime library. You have to install it before you can parse data.

The JavaScript runtime library is available at npm:

npm install kaitai-struct

Code

See the usage examples in the JavaScript notes.

Parse structure from an ArrayBuffer:

var arrayBuffer = ...;
var data = new Exif(new KaitaiStream(arrayBuffer));

After that, one can get various attributes from the structure by accessing fields or properties like:

data.endianness // => get endianness

JavaScript source code to parse exif

Exif.js

// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

(function (root, factory) {
  if (typeof define === 'function' && define.amd) {
    define(['kaitai-struct/KaitaiStream'], factory);
  } else if (typeof module === 'object' && module.exports) {
    module.exports = factory(require('kaitai-struct/KaitaiStream'));
  } else {
    root.Exif = factory(root.KaitaiStream);
  }
}(this, function (KaitaiStream) {
var Exif = (function() {
  function Exif(_io, _parent, _root) {
    this._io = _io;
    this._parent = _parent;
    this._root = _root || this;

    this._read();
  }
  Exif.prototype._read = function() {
    this.endianness = this._io.readU2le();
    this.body = new ExifBody(this._io, this, this._root);
  }

  var ExifBody = Exif.ExifBody = (function() {
    function ExifBody(_io, _parent, _root) {
      this._io = _io;
      this._parent = _parent;
      this._root = _root || this;

      this._read();
    }
    ExifBody.prototype._read = function() {
      switch (this._root.endianness) {
      case 18761:
        this._is_le = true;
        break;
      case 19789:
        this._is_le = false;
        break;
      }

      if (this._is_le === true) {
        this._readLE();
      } else if (this._is_le === false) {
        this._readBE();
      } else {
        throw new KaitaiStream.UndecidedEndiannessError();
      }
    }
    ExifBody.prototype._readLE = function() {
      this.version = this._io.readU2le();
      this.ifd0Ofs = this._io.readU4le();
    }
    ExifBody.prototype._readBE = function() {
      this.version = this._io.readU2be();
      this.ifd0Ofs = this._io.readU4be();
    }

    var Ifd = ExifBody.Ifd = (function() {
      function Ifd(_io, _parent, _root, _is_le) {
        this._io = _io;
        this._parent = _parent;
        this._root = _root || this;
        this._is_le = _is_le;

        this._read();
      }
      Ifd.prototype._read = function() {

        if (this._is_le === true) {
          this._readLE();
        } else if (this._is_le === false) {
          this._readBE();
        } else {
          throw new KaitaiStream.UndecidedEndiannessError();
        }
      }
      Ifd.prototype._readLE = function() {
        this.numFields = this._io.readU2le();
        this.fields = new Array(this.numFields);
        for (var i = 0; i < this.numFields; i++) {
          this.fields[i] = new IfdField(this._io, this, this._root, this._is_le);
        }
        this.nextIfdOfs = this._io.readU4le();
      }
      Ifd.prototype._readBE = function() {
        this.numFields = this._io.readU2be();
        this.fields = new Array(this.numFields);
        for (var i = 0; i < this.numFields; i++) {
          this.fields[i] = new IfdField(this._io, this, this._root, this._is_le);
        }
        this.nextIfdOfs = this._io.readU4be();
      }
      Object.defineProperty(Ifd.prototype, 'nextIfd', {
        get: function() {
          if (this._m_nextIfd !== undefined)
            return this._m_nextIfd;
          if (this.nextIfdOfs != 0) {
            var _pos = this._io.pos;
            this._io.seek(this.nextIfdOfs);
            if (this._is_le) {
              this._m_nextIfd = new Ifd(this._io, this, this._root, this._is_le);
            } else {
              this._m_nextIfd = new Ifd(this._io, this, this._root, this._is_le);
            }
            this._io.seek(_pos);
          }
          return this._m_nextIfd;
        }
      });

      return Ifd;
    })();

    var IfdField = ExifBody.IfdField = (function() {
      IfdField.FieldTypeEnum = Object.freeze({
        BYTE: 1,
        ASCII_STRING: 2,
        WORD: 3,
        DWORD: 4,
        RATIONAL: 5,
        UNDEFINED: 7,
        SLONG: 9,
        SRATIONAL: 10,

        1: "BYTE",
        2: "ASCII_STRING",
        3: "WORD",
        4: "DWORD",
        5: "RATIONAL",
        7: "UNDEFINED",
        9: "SLONG",
        10: "SRATIONAL",
      });

      IfdField.TagEnum = Object.freeze({
        IMAGE_WIDTH: 256,
        IMAGE_HEIGHT: 257,
        BITS_PER_SAMPLE: 258,
        COMPRESSION: 259,
        PHOTOMETRIC_INTERPRETATION: 262,
        THRESHOLDING: 263,
        CELL_WIDTH: 264,
        CELL_LENGTH: 265,
        FILL_ORDER: 266,
        DOCUMENT_NAME: 269,
        IMAGE_DESCRIPTION: 270,
        MAKE: 271,
        MODEL: 272,
        STRIP_OFFSETS: 273,
        ORIENTATION: 274,
        SAMPLES_PER_PIXEL: 277,
        ROWS_PER_STRIP: 278,
        STRIP_BYTE_COUNTS: 279,
        MIN_SAMPLE_VALUE: 280,
        MAX_SAMPLE_VALUE: 281,
        X_RESOLUTION: 282,
        Y_RESOLUTION: 283,
        PLANAR_CONFIGURATION: 284,
        PAGE_NAME: 285,
        X_POSITION: 286,
        Y_POSITION: 287,
        FREE_OFFSETS: 288,
        FREE_BYTE_COUNTS: 289,
        GRAY_RESPONSE_UNIT: 290,
        GRAY_RESPONSE_CURVE: 291,
        T4_OPTIONS: 292,
        T6_OPTIONS: 293,
        RESOLUTION_UNIT: 296,
        PAGE_NUMBER: 297,
        COLOR_RESPONSE_UNIT: 300,
        TRANSFER_FUNCTION: 301,
        SOFTWARE: 305,
        MODIFY_DATE: 306,
        ARTIST: 315,
        HOST_COMPUTER: 316,
        PREDICTOR: 317,
        WHITE_POINT: 318,
        PRIMARY_CHROMATICITIES: 319,
        COLOR_MAP: 320,
        HALFTONE_HINTS: 321,
        TILE_WIDTH: 322,
        TILE_LENGTH: 323,
        TILE_OFFSETS: 324,
        TILE_BYTE_COUNTS: 325,
        BAD_FAX_LINES: 326,
        CLEAN_FAX_DATA: 327,
        CONSECUTIVE_BAD_FAX_LINES: 328,
        SUB_IFD: 330,
        INK_SET: 332,
        INK_NAMES: 333,
        NUMBEROF_INKS: 334,
        DOT_RANGE: 336,
        TARGET_PRINTER: 337,
        EXTRA_SAMPLES: 338,
        SAMPLE_FORMAT: 339,
        S_MIN_SAMPLE_VALUE: 340,
        S_MAX_SAMPLE_VALUE: 341,
        TRANSFER_RANGE: 342,
        CLIP_PATH: 343,
        X_CLIP_PATH_UNITS: 344,
        Y_CLIP_PATH_UNITS: 345,
        INDEXED: 346,
        JPEG_TABLES: 347,
        OPI_PROXY: 351,
        GLOBAL_PARAMETERS_IFD: 400,
        PROFILE_TYPE: 401,
        FAX_PROFILE: 402,
        CODING_METHODS: 403,
        VERSION_YEAR: 404,
        MODE_NUMBER: 405,
        DECODE: 433,
        DEFAULT_IMAGE_COLOR: 434,
        T82_OPTIONS: 435,
        JPEG_TABLES2: 437,
        JPEG_PROC: 512,
        THUMBNAIL_OFFSET: 513,
        THUMBNAIL_LENGTH: 514,
        JPEG_RESTART_INTERVAL: 515,
        JPEG_LOSSLESS_PREDICTORS: 517,
        JPEG_POINT_TRANSFORMS: 518,
        JPEGQ_TABLES: 519,
        JPEGDC_TABLES: 520,
        JPEGAC_TABLES: 521,
        Y_CB_CR_COEFFICIENTS: 529,
        Y_CB_CR_SUB_SAMPLING: 530,
        Y_CB_CR_POSITIONING: 531,
        REFERENCE_BLACK_WHITE: 532,
        STRIP_ROW_COUNTS: 559,
        APPLICATION_NOTES: 700,
        USPTO_MISCELLANEOUS: 999,
        RELATED_IMAGE_FILE_FORMAT: 4096,
        RELATED_IMAGE_WIDTH: 4097,
        RELATED_IMAGE_HEIGHT: 4098,
        RATING: 18246,
        XP_DIP_XML: 18247,
        STITCH_INFO: 18248,
        RATING_PERCENT: 18249,
        SONY_RAW_FILE_TYPE: 28672,
        LIGHT_FALLOFF_PARAMS: 28722,
        CHROMATIC_ABERRATION_CORR_PARAMS: 28725,
        DISTORTION_CORR_PARAMS: 28727,
        IMAGE_ID: 32781,
        WANG_TAG1: 32931,
        WANG_ANNOTATION: 32932,
        WANG_TAG3: 32933,
        WANG_TAG4: 32934,
        IMAGE_REFERENCE_POINTS: 32953,
        REGION_XFORM_TACK_POINT: 32954,
        WARP_QUADRILATERAL: 32955,
        AFFINE_TRANSFORM_MAT: 32956,
        MATTEING: 32995,
        DATA_TYPE: 32996,
        IMAGE_DEPTH: 32997,
        TILE_DEPTH: 32998,
        IMAGE_FULL_WIDTH: 33300,
        IMAGE_FULL_HEIGHT: 33301,
        TEXTURE_FORMAT: 33302,
        WRAP_MODES: 33303,
        FOV_COT: 33304,
        MATRIX_WORLD_TO_SCREEN: 33305,
        MATRIX_WORLD_TO_CAMERA: 33306,
        MODEL2: 33405,
        CFA_REPEAT_PATTERN_DIM: 33421,
        CFA_PATTERN2: 33422,
        BATTERY_LEVEL: 33423,
        KODAK_IFD: 33424,
        COPYRIGHT: 33432,
        EXPOSURE_TIME: 33434,
        F_NUMBER: 33437,
        MD_FILE_TAG: 33445,
        MD_SCALE_PIXEL: 33446,
        MD_COLOR_TABLE: 33447,
        MD_LAB_NAME: 33448,
        MD_SAMPLE_INFO: 33449,
        MD_PREP_DATE: 33450,
        MD_PREP_TIME: 33451,
        MD_FILE_UNITS: 33452,
        PIXEL_SCALE: 33550,
        ADVENT_SCALE: 33589,
        ADVENT_REVISION: 33590,
        UIC1_TAG: 33628,
        UIC2_TAG: 33629,
        UIC3_TAG: 33630,
        UIC4_TAG: 33631,
        IPTC_NAA: 33723,
        INTERGRAPH_PACKET_DATA: 33918,
        INTERGRAPH_FLAG_REGISTERS: 33919,
        INTERGRAPH_MATRIX: 33920,
        INGR_RESERVED: 33921,
        MODEL_TIE_POINT: 33922,
        SITE: 34016,
        COLOR_SEQUENCE: 34017,
        IT8_HEADER: 34018,
        RASTER_PADDING: 34019,
        BITS_PER_RUN_LENGTH: 34020,
        BITS_PER_EXTENDED_RUN_LENGTH: 34021,
        COLOR_TABLE: 34022,
        IMAGE_COLOR_INDICATOR: 34023,
        BACKGROUND_COLOR_INDICATOR: 34024,
        IMAGE_COLOR_VALUE: 34025,
        BACKGROUND_COLOR_VALUE: 34026,
        PIXEL_INTENSITY_RANGE: 34027,
        TRANSPARENCY_INDICATOR: 34028,
        COLOR_CHARACTERIZATION: 34029,
        HC_USAGE: 34030,
        TRAP_INDICATOR: 34031,
        CMYK_EQUIVALENT: 34032,
        SEM_INFO: 34118,
        AFCP_IPTC: 34152,
        PIXEL_MAGIC_JBIG_OPTIONS: 34232,
        JPL_CARTO_IFD: 34263,
        MODEL_TRANSFORM: 34264,
        WB_GRGB_LEVELS: 34306,
        LEAF_DATA: 34310,
        PHOTOSHOP_SETTINGS: 34377,
        EXIF_OFFSET: 34665,
        ICC_PROFILE: 34675,
        TIFF_FX_EXTENSIONS: 34687,
        MULTI_PROFILES: 34688,
        SHARED_DATA: 34689,
        T88_OPTIONS: 34690,
        IMAGE_LAYER: 34732,
        GEO_TIFF_DIRECTORY: 34735,
        GEO_TIFF_DOUBLE_PARAMS: 34736,
        GEO_TIFF_ASCII_PARAMS: 34737,
        JBIG_OPTIONS: 34750,
        EXPOSURE_PROGRAM: 34850,
        SPECTRAL_SENSITIVITY: 34852,
        GPS_INFO: 34853,
        ISO: 34855,
        OPTO_ELECTRIC_CONV_FACTOR: 34856,
        INTERLACE: 34857,
        TIME_ZONE_OFFSET: 34858,
        SELF_TIMER_MODE: 34859,
        SENSITIVITY_TYPE: 34864,
        STANDARD_OUTPUT_SENSITIVITY: 34865,
        RECOMMENDED_EXPOSURE_INDEX: 34866,
        ISO_SPEED: 34867,
        ISO_SPEED_LATITUDEYYY: 34868,
        ISO_SPEED_LATITUDEZZZ: 34869,
        FAX_RECV_PARAMS: 34908,
        FAX_SUB_ADDRESS: 34909,
        FAX_RECV_TIME: 34910,
        FEDEX_EDR: 34929,
        LEAF_SUB_IFD: 34954,
        EXIF_VERSION: 36864,
        DATE_TIME_ORIGINAL: 36867,
        CREATE_DATE: 36868,
        GOOGLE_PLUS_UPLOAD_CODE: 36873,
        OFFSET_TIME: 36880,
        OFFSET_TIME_ORIGINAL: 36881,
        OFFSET_TIME_DIGITIZED: 36882,
        COMPONENTS_CONFIGURATION: 37121,
        COMPRESSED_BITS_PER_PIXEL: 37122,
        SHUTTER_SPEED_VALUE: 37377,
        APERTURE_VALUE: 37378,
        BRIGHTNESS_VALUE: 37379,
        EXPOSURE_COMPENSATION: 37380,
        MAX_APERTURE_VALUE: 37381,
        SUBJECT_DISTANCE: 37382,
        METERING_MODE: 37383,
        LIGHT_SOURCE: 37384,
        FLASH: 37385,
        FOCAL_LENGTH: 37386,
        FLASH_ENERGY: 37387,
        SPATIAL_FREQUENCY_RESPONSE: 37388,
        NOISE: 37389,
        FOCAL_PLANE_X_RESOLUTION: 37390,
        FOCAL_PLANE_Y_RESOLUTION: 37391,
        FOCAL_PLANE_RESOLUTION_UNIT: 37392,
        IMAGE_NUMBER: 37393,
        SECURITY_CLASSIFICATION: 37394,
        IMAGE_HISTORY: 37395,
        SUBJECT_AREA: 37396,
        EXPOSURE_INDEX: 37397,
        TIFF_EP_STANDARD_ID: 37398,
        SENSING_METHOD: 37399,
        CIP3_DATA_FILE: 37434,
        CIP3_SHEET: 37435,
        CIP3_SIDE: 37436,
        STO_NITS: 37439,
        MAKER_NOTE: 37500,
        USER_COMMENT: 37510,
        SUB_SEC_TIME: 37520,
        SUB_SEC_TIME_ORIGINAL: 37521,
        SUB_SEC_TIME_DIGITIZED: 37522,
        MS_DOCUMENT_TEXT: 37679,
        MS_PROPERTY_SET_STORAGE: 37680,
        MS_DOCUMENT_TEXT_POSITION: 37681,
        IMAGE_SOURCE_DATA: 37724,
        AMBIENT_TEMPERATURE: 37888,
        HUMIDITY: 37889,
        PRESSURE: 37890,
        WATER_DEPTH: 37891,
        ACCELERATION: 37892,
        CAMERA_ELEVATION_ANGLE: 37893,
        XP_TITLE: 40091,
        XP_COMMENT: 40092,
        XP_AUTHOR: 40093,
        XP_KEYWORDS: 40094,
        XP_SUBJECT: 40095,
        FLASHPIX_VERSION: 40960,
        COLOR_SPACE: 40961,
        EXIF_IMAGE_WIDTH: 40962,
        EXIF_IMAGE_HEIGHT: 40963,
        RELATED_SOUND_FILE: 40964,
        INTEROP_OFFSET: 40965,
        SAMSUNG_RAW_POINTERS_OFFSET: 40976,
        SAMSUNG_RAW_POINTERS_LENGTH: 40977,
        SAMSUNG_RAW_BYTE_ORDER: 41217,
        SAMSUNG_RAW_UNKNOWN: 41218,
        FLASH_ENERGY2: 41483,
        SPATIAL_FREQUENCY_RESPONSE2: 41484,
        NOISE2: 41485,
        FOCAL_PLANE_X_RESOLUTION2: 41486,
        FOCAL_PLANE_Y_RESOLUTION2: 41487,
        FOCAL_PLANE_RESOLUTION_UNIT2: 41488,
        IMAGE_NUMBER2: 41489,
        SECURITY_CLASSIFICATION2: 41490,
        IMAGE_HISTORY2: 41491,
        SUBJECT_LOCATION: 41492,
        EXPOSURE_INDEX2: 41493,
        TIFF_EP_STANDARD_ID2: 41494,
        SENSING_METHOD2: 41495,
        FILE_SOURCE: 41728,
        SCENE_TYPE: 41729,
        CFA_PATTERN: 41730,
        CUSTOM_RENDERED: 41985,
        EXPOSURE_MODE: 41986,
        WHITE_BALANCE: 41987,
        DIGITAL_ZOOM_RATIO: 41988,
        FOCAL_LENGTH_IN35MM_FORMAT: 41989,
        SCENE_CAPTURE_TYPE: 41990,
        GAIN_CONTROL: 41991,
        CONTRAST: 41992,
        SATURATION: 41993,
        SHARPNESS: 41994,
        DEVICE_SETTING_DESCRIPTION: 41995,
        SUBJECT_DISTANCE_RANGE: 41996,
        IMAGE_UNIQUE_ID: 42016,
        OWNER_NAME: 42032,
        SERIAL_NUMBER: 42033,
        LENS_INFO: 42034,
        LENS_MAKE: 42035,
        LENS_MODEL: 42036,
        LENS_SERIAL_NUMBER: 42037,
        GDAL_METADATA: 42112,
        GDAL_NO_DATA: 42113,
        GAMMA: 42240,
        EXPAND_SOFTWARE: 44992,
        EXPAND_LENS: 44993,
        EXPAND_FILM: 44994,
        EXPAND_FILTER_LENS: 44995,
        EXPAND_SCANNER: 44996,
        EXPAND_FLASH_LAMP: 44997,
        PIXEL_FORMAT: 48129,
        TRANSFORMATION: 48130,
        UNCOMPRESSED: 48131,
        IMAGE_TYPE: 48132,
        IMAGE_WIDTH2: 48256,
        IMAGE_HEIGHT2: 48257,
        WIDTH_RESOLUTION: 48258,
        HEIGHT_RESOLUTION: 48259,
        IMAGE_OFFSET: 48320,
        IMAGE_BYTE_COUNT: 48321,
        ALPHA_OFFSET: 48322,
        ALPHA_BYTE_COUNT: 48323,
        IMAGE_DATA_DISCARD: 48324,
        ALPHA_DATA_DISCARD: 48325,
        OCE_SCANJOB_DESC: 50215,
        OCE_APPLICATION_SELECTOR: 50216,
        OCE_ID_NUMBER: 50217,
        OCE_IMAGE_LOGIC: 50218,
        ANNOTATIONS: 50255,
        PRINT_IM: 50341,
        ORIGINAL_FILE_NAME: 50547,
        USPTO_ORIGINAL_CONTENT_TYPE: 50560,
        DNG_VERSION: 50706,
        DNG_BACKWARD_VERSION: 50707,
        UNIQUE_CAMERA_MODEL: 50708,
        LOCALIZED_CAMERA_MODEL: 50709,
        CFA_PLANE_COLOR: 50710,
        CFA_LAYOUT: 50711,
        LINEARIZATION_TABLE: 50712,
        BLACK_LEVEL_REPEAT_DIM: 50713,
        BLACK_LEVEL: 50714,
        BLACK_LEVEL_DELTA_H: 50715,
        BLACK_LEVEL_DELTA_V: 50716,
        WHITE_LEVEL: 50717,
        DEFAULT_SCALE: 50718,
        DEFAULT_CROP_ORIGIN: 50719,
        DEFAULT_CROP_SIZE: 50720,
        COLOR_MATRIX1: 50721,
        COLOR_MATRIX2: 50722,
        CAMERA_CALIBRATION1: 50723,
        CAMERA_CALIBRATION2: 50724,
        REDUCTION_MATRIX1: 50725,
        REDUCTION_MATRIX2: 50726,
        ANALOG_BALANCE: 50727,
        AS_SHOT_NEUTRAL: 50728,
        AS_SHOT_WHITE_XY: 50729,
        BASELINE_EXPOSURE: 50730,
        BASELINE_NOISE: 50731,
        BASELINE_SHARPNESS: 50732,
        BAYER_GREEN_SPLIT: 50733,
        LINEAR_RESPONSE_LIMIT: 50734,
        CAMERA_SERIAL_NUMBER: 50735,
        DNG_LENS_INFO: 50736,
        CHROMA_BLUR_RADIUS: 50737,
        ANTI_ALIAS_STRENGTH: 50738,
        SHADOW_SCALE: 50739,
        SR2_PRIVATE: 50740,
        MAKER_NOTE_SAFETY: 50741,
        RAW_IMAGE_SEGMENTATION: 50752,
        CALIBRATION_ILLUMINANT1: 50778,
        CALIBRATION_ILLUMINANT2: 50779,
        BEST_QUALITY_SCALE: 50780,
        RAW_DATA_UNIQUE_ID: 50781,
        ALIAS_LAYER_METADATA: 50784,
        ORIGINAL_RAW_FILE_NAME: 50827,
        ORIGINAL_RAW_FILE_DATA: 50828,
        ACTIVE_AREA: 50829,
        MASKED_AREAS: 50830,
        AS_SHOT_ICC_PROFILE: 50831,
        AS_SHOT_PRE_PROFILE_MATRIX: 50832,
        CURRENT_ICC_PROFILE: 50833,
        CURRENT_PRE_PROFILE_MATRIX: 50834,
        COLORIMETRIC_REFERENCE: 50879,
        S_RAW_TYPE: 50885,
        PANASONIC_TITLE: 50898,
        PANASONIC_TITLE2: 50899,
        CAMERA_CALIBRATION_SIG: 50931,
        PROFILE_CALIBRATION_SIG: 50932,
        PROFILE_IFD: 50933,
        AS_SHOT_PROFILE_NAME: 50934,
        NOISE_REDUCTION_APPLIED: 50935,
        PROFILE_NAME: 50936,
        PROFILE_HUE_SAT_MAP_DIMS: 50937,
        PROFILE_HUE_SAT_MAP_DATA1: 50938,
        PROFILE_HUE_SAT_MAP_DATA2: 50939,
        PROFILE_TONE_CURVE: 50940,
        PROFILE_EMBED_POLICY: 50941,
        PROFILE_COPYRIGHT: 50942,
        FORWARD_MATRIX1: 50964,
        FORWARD_MATRIX2: 50965,
        PREVIEW_APPLICATION_NAME: 50966,
        PREVIEW_APPLICATION_VERSION: 50967,
        PREVIEW_SETTINGS_NAME: 50968,
        PREVIEW_SETTINGS_DIGEST: 50969,
        PREVIEW_COLOR_SPACE: 50970,
        PREVIEW_DATE_TIME: 50971,
        RAW_IMAGE_DIGEST: 50972,
        ORIGINAL_RAW_FILE_DIGEST: 50973,
        SUB_TILE_BLOCK_SIZE: 50974,
        ROW_INTERLEAVE_FACTOR: 50975,
        PROFILE_LOOK_TABLE_DIMS: 50981,
        PROFILE_LOOK_TABLE_DATA: 50982,
        OPCODE_LIST1: 51008,
        OPCODE_LIST2: 51009,
        OPCODE_LIST3: 51022,
        NOISE_PROFILE: 51041,
        TIME_CODES: 51043,
        FRAME_RATE: 51044,
        T_STOP: 51058,
        REEL_NAME: 51081,
        ORIGINAL_DEFAULT_FINAL_SIZE: 51089,
        ORIGINAL_BEST_QUALITY_SIZE: 51090,
        ORIGINAL_DEFAULT_CROP_SIZE: 51091,
        CAMERA_LABEL: 51105,
        PROFILE_HUE_SAT_MAP_ENCODING: 51107,
        PROFILE_LOOK_TABLE_ENCODING: 51108,
        BASELINE_EXPOSURE_OFFSET: 51109,
        DEFAULT_BLACK_RENDER: 51110,
        NEW_RAW_IMAGE_DIGEST: 51111,
        RAW_TO_PREVIEW_GAIN: 51112,
        DEFAULT_USER_CROP: 51125,
        PADDING: 59932,
        OFFSET_SCHEMA: 59933,
        OWNER_NAME2: 65000,
        SERIAL_NUMBER2: 65001,
        LENS: 65002,
        KDC_IFD: 65024,
        RAW_FILE: 65100,
        CONVERTER: 65101,
        WHITE_BALANCE2: 65102,
        EXPOSURE: 65105,
        SHADOWS: 65106,
        BRIGHTNESS: 65107,
        CONTRAST2: 65108,
        SATURATION2: 65109,
        SHARPNESS2: 65110,
        SMOOTHNESS: 65111,
        MOIRE_FILTER: 65112,

        256: "IMAGE_WIDTH",
        257: "IMAGE_HEIGHT",
        258: "BITS_PER_SAMPLE",
        259: "COMPRESSION",
        262: "PHOTOMETRIC_INTERPRETATION",
        263: "THRESHOLDING",
        264: "CELL_WIDTH",
        265: "CELL_LENGTH",
        266: "FILL_ORDER",
        269: "DOCUMENT_NAME",
        270: "IMAGE_DESCRIPTION",
        271: "MAKE",
        272: "MODEL",
        273: "STRIP_OFFSETS",
        274: "ORIENTATION",
        277: "SAMPLES_PER_PIXEL",
        278: "ROWS_PER_STRIP",
        279: "STRIP_BYTE_COUNTS",
        280: "MIN_SAMPLE_VALUE",
        281: "MAX_SAMPLE_VALUE",
        282: "X_RESOLUTION",
        283: "Y_RESOLUTION",
        284: "PLANAR_CONFIGURATION",
        285: "PAGE_NAME",
        286: "X_POSITION",
        287: "Y_POSITION",
        288: "FREE_OFFSETS",
        289: "FREE_BYTE_COUNTS",
        290: "GRAY_RESPONSE_UNIT",
        291: "GRAY_RESPONSE_CURVE",
        292: "T4_OPTIONS",
        293: "T6_OPTIONS",
        296: "RESOLUTION_UNIT",
        297: "PAGE_NUMBER",
        300: "COLOR_RESPONSE_UNIT",
        301: "TRANSFER_FUNCTION",
        305: "SOFTWARE",
        306: "MODIFY_DATE",
        315: "ARTIST",
        316: "HOST_COMPUTER",
        317: "PREDICTOR",
        318: "WHITE_POINT",
        319: "PRIMARY_CHROMATICITIES",
        320: "COLOR_MAP",
        321: "HALFTONE_HINTS",
        322: "TILE_WIDTH",
        323: "TILE_LENGTH",
        324: "TILE_OFFSETS",
        325: "TILE_BYTE_COUNTS",
        326: "BAD_FAX_LINES",
        327: "CLEAN_FAX_DATA",
        328: "CONSECUTIVE_BAD_FAX_LINES",
        330: "SUB_IFD",
        332: "INK_SET",
        333: "INK_NAMES",
        334: "NUMBEROF_INKS",
        336: "DOT_RANGE",
        337: "TARGET_PRINTER",
        338: "EXTRA_SAMPLES",
        339: "SAMPLE_FORMAT",
        340: "S_MIN_SAMPLE_VALUE",
        341: "S_MAX_SAMPLE_VALUE",
        342: "TRANSFER_RANGE",
        343: "CLIP_PATH",
        344: "X_CLIP_PATH_UNITS",
        345: "Y_CLIP_PATH_UNITS",
        346: "INDEXED",
        347: "JPEG_TABLES",
        351: "OPI_PROXY",
        400: "GLOBAL_PARAMETERS_IFD",
        401: "PROFILE_TYPE",
        402: "FAX_PROFILE",
        403: "CODING_METHODS",
        404: "VERSION_YEAR",
        405: "MODE_NUMBER",
        433: "DECODE",
        434: "DEFAULT_IMAGE_COLOR",
        435: "T82_OPTIONS",
        437: "JPEG_TABLES2",
        512: "JPEG_PROC",
        513: "THUMBNAIL_OFFSET",
        514: "THUMBNAIL_LENGTH",
        515: "JPEG_RESTART_INTERVAL",
        517: "JPEG_LOSSLESS_PREDICTORS",
        518: "JPEG_POINT_TRANSFORMS",
        519: "JPEGQ_TABLES",
        520: "JPEGDC_TABLES",
        521: "JPEGAC_TABLES",
        529: "Y_CB_CR_COEFFICIENTS",
        530: "Y_CB_CR_SUB_SAMPLING",
        531: "Y_CB_CR_POSITIONING",
        532: "REFERENCE_BLACK_WHITE",
        559: "STRIP_ROW_COUNTS",
        700: "APPLICATION_NOTES",
        999: "USPTO_MISCELLANEOUS",
        4096: "RELATED_IMAGE_FILE_FORMAT",
        4097: "RELATED_IMAGE_WIDTH",
        4098: "RELATED_IMAGE_HEIGHT",
        18246: "RATING",
        18247: "XP_DIP_XML",
        18248: "STITCH_INFO",
        18249: "RATING_PERCENT",
        28672: "SONY_RAW_FILE_TYPE",
        28722: "LIGHT_FALLOFF_PARAMS",
        28725: "CHROMATIC_ABERRATION_CORR_PARAMS",
        28727: "DISTORTION_CORR_PARAMS",
        32781: "IMAGE_ID",
        32931: "WANG_TAG1",
        32932: "WANG_ANNOTATION",
        32933: "WANG_TAG3",
        32934: "WANG_TAG4",
        32953: "IMAGE_REFERENCE_POINTS",
        32954: "REGION_XFORM_TACK_POINT",
        32955: "WARP_QUADRILATERAL",
        32956: "AFFINE_TRANSFORM_MAT",
        32995: "MATTEING",
        32996: "DATA_TYPE",
        32997: "IMAGE_DEPTH",
        32998: "TILE_DEPTH",
        33300: "IMAGE_FULL_WIDTH",
        33301: "IMAGE_FULL_HEIGHT",
        33302: "TEXTURE_FORMAT",
        33303: "WRAP_MODES",
        33304: "FOV_COT",
        33305: "MATRIX_WORLD_TO_SCREEN",
        33306: "MATRIX_WORLD_TO_CAMERA",
        33405: "MODEL2",
        33421: "CFA_REPEAT_PATTERN_DIM",
        33422: "CFA_PATTERN2",
        33423: "BATTERY_LEVEL",
        33424: "KODAK_IFD",
        33432: "COPYRIGHT",
        33434: "EXPOSURE_TIME",
        33437: "F_NUMBER",
        33445: "MD_FILE_TAG",
        33446: "MD_SCALE_PIXEL",
        33447: "MD_COLOR_TABLE",
        33448: "MD_LAB_NAME",
        33449: "MD_SAMPLE_INFO",
        33450: "MD_PREP_DATE",
        33451: "MD_PREP_TIME",
        33452: "MD_FILE_UNITS",
        33550: "PIXEL_SCALE",
        33589: "ADVENT_SCALE",
        33590: "ADVENT_REVISION",
        33628: "UIC1_TAG",
        33629: "UIC2_TAG",
        33630: "UIC3_TAG",
        33631: "UIC4_TAG",
        33723: "IPTC_NAA",
        33918: "INTERGRAPH_PACKET_DATA",
        33919: "INTERGRAPH_FLAG_REGISTERS",
        33920: "INTERGRAPH_MATRIX",
        33921: "INGR_RESERVED",
        33922: "MODEL_TIE_POINT",
        34016: "SITE",
        34017: "COLOR_SEQUENCE",
        34018: "IT8_HEADER",
        34019: "RASTER_PADDING",
        34020: "BITS_PER_RUN_LENGTH",
        34021: "BITS_PER_EXTENDED_RUN_LENGTH",
        34022: "COLOR_TABLE",
        34023: "IMAGE_COLOR_INDICATOR",
        34024: "BACKGROUND_COLOR_INDICATOR",
        34025: "IMAGE_COLOR_VALUE",
        34026: "BACKGROUND_COLOR_VALUE",
        34027: "PIXEL_INTENSITY_RANGE",
        34028: "TRANSPARENCY_INDICATOR",
        34029: "COLOR_CHARACTERIZATION",
        34030: "HC_USAGE",
        34031: "TRAP_INDICATOR",
        34032: "CMYK_EQUIVALENT",
        34118: "SEM_INFO",
        34152: "AFCP_IPTC",
        34232: "PIXEL_MAGIC_JBIG_OPTIONS",
        34263: "JPL_CARTO_IFD",
        34264: "MODEL_TRANSFORM",
        34306: "WB_GRGB_LEVELS",
        34310: "LEAF_DATA",
        34377: "PHOTOSHOP_SETTINGS",
        34665: "EXIF_OFFSET",
        34675: "ICC_PROFILE",
        34687: "TIFF_FX_EXTENSIONS",
        34688: "MULTI_PROFILES",
        34689: "SHARED_DATA",
        34690: "T88_OPTIONS",
        34732: "IMAGE_LAYER",
        34735: "GEO_TIFF_DIRECTORY",
        34736: "GEO_TIFF_DOUBLE_PARAMS",
        34737: "GEO_TIFF_ASCII_PARAMS",
        34750: "JBIG_OPTIONS",
        34850: "EXPOSURE_PROGRAM",
        34852: "SPECTRAL_SENSITIVITY",
        34853: "GPS_INFO",
        34855: "ISO",
        34856: "OPTO_ELECTRIC_CONV_FACTOR",
        34857: "INTERLACE",
        34858: "TIME_ZONE_OFFSET",
        34859: "SELF_TIMER_MODE",
        34864: "SENSITIVITY_TYPE",
        34865: "STANDARD_OUTPUT_SENSITIVITY",
        34866: "RECOMMENDED_EXPOSURE_INDEX",
        34867: "ISO_SPEED",
        34868: "ISO_SPEED_LATITUDEYYY",
        34869: "ISO_SPEED_LATITUDEZZZ",
        34908: "FAX_RECV_PARAMS",
        34909: "FAX_SUB_ADDRESS",
        34910: "FAX_RECV_TIME",
        34929: "FEDEX_EDR",
        34954: "LEAF_SUB_IFD",
        36864: "EXIF_VERSION",
        36867: "DATE_TIME_ORIGINAL",
        36868: "CREATE_DATE",
        36873: "GOOGLE_PLUS_UPLOAD_CODE",
        36880: "OFFSET_TIME",
        36881: "OFFSET_TIME_ORIGINAL",
        36882: "OFFSET_TIME_DIGITIZED",
        37121: "COMPONENTS_CONFIGURATION",
        37122: "COMPRESSED_BITS_PER_PIXEL",
        37377: "SHUTTER_SPEED_VALUE",
        37378: "APERTURE_VALUE",
        37379: "BRIGHTNESS_VALUE",
        37380: "EXPOSURE_COMPENSATION",
        37381: "MAX_APERTURE_VALUE",
        37382: "SUBJECT_DISTANCE",
        37383: "METERING_MODE",
        37384: "LIGHT_SOURCE",
        37385: "FLASH",
        37386: "FOCAL_LENGTH",
        37387: "FLASH_ENERGY",
        37388: "SPATIAL_FREQUENCY_RESPONSE",
        37389: "NOISE",
        37390: "FOCAL_PLANE_X_RESOLUTION",
        37391: "FOCAL_PLANE_Y_RESOLUTION",
        37392: "FOCAL_PLANE_RESOLUTION_UNIT",
        37393: "IMAGE_NUMBER",
        37394: "SECURITY_CLASSIFICATION",
        37395: "IMAGE_HISTORY",
        37396: "SUBJECT_AREA",
        37397: "EXPOSURE_INDEX",
        37398: "TIFF_EP_STANDARD_ID",
        37399: "SENSING_METHOD",
        37434: "CIP3_DATA_FILE",
        37435: "CIP3_SHEET",
        37436: "CIP3_SIDE",
        37439: "STO_NITS",
        37500: "MAKER_NOTE",
        37510: "USER_COMMENT",
        37520: "SUB_SEC_TIME",
        37521: "SUB_SEC_TIME_ORIGINAL",
        37522: "SUB_SEC_TIME_DIGITIZED",
        37679: "MS_DOCUMENT_TEXT",
        37680: "MS_PROPERTY_SET_STORAGE",
        37681: "MS_DOCUMENT_TEXT_POSITION",
        37724: "IMAGE_SOURCE_DATA",
        37888: "AMBIENT_TEMPERATURE",
        37889: "HUMIDITY",
        37890: "PRESSURE",
        37891: "WATER_DEPTH",
        37892: "ACCELERATION",
        37893: "CAMERA_ELEVATION_ANGLE",
        40091: "XP_TITLE",
        40092: "XP_COMMENT",
        40093: "XP_AUTHOR",
        40094: "XP_KEYWORDS",
        40095: "XP_SUBJECT",
        40960: "FLASHPIX_VERSION",
        40961: "COLOR_SPACE",
        40962: "EXIF_IMAGE_WIDTH",
        40963: "EXIF_IMAGE_HEIGHT",
        40964: "RELATED_SOUND_FILE",
        40965: "INTEROP_OFFSET",
        40976: "SAMSUNG_RAW_POINTERS_OFFSET",
        40977: "SAMSUNG_RAW_POINTERS_LENGTH",
        41217: "SAMSUNG_RAW_BYTE_ORDER",
        41218: "SAMSUNG_RAW_UNKNOWN",
        41483: "FLASH_ENERGY2",
        41484: "SPATIAL_FREQUENCY_RESPONSE2",
        41485: "NOISE2",
        41486: "FOCAL_PLANE_X_RESOLUTION2",
        41487: "FOCAL_PLANE_Y_RESOLUTION2",
        41488: "FOCAL_PLANE_RESOLUTION_UNIT2",
        41489: "IMAGE_NUMBER2",
        41490: "SECURITY_CLASSIFICATION2",
        41491: "IMAGE_HISTORY2",
        41492: "SUBJECT_LOCATION",
        41493: "EXPOSURE_INDEX2",
        41494: "TIFF_EP_STANDARD_ID2",
        41495: "SENSING_METHOD2",
        41728: "FILE_SOURCE",
        41729: "SCENE_TYPE",
        41730: "CFA_PATTERN",
        41985: "CUSTOM_RENDERED",
        41986: "EXPOSURE_MODE",
        41987: "WHITE_BALANCE",
        41988: "DIGITAL_ZOOM_RATIO",
        41989: "FOCAL_LENGTH_IN35MM_FORMAT",
        41990: "SCENE_CAPTURE_TYPE",
        41991: "GAIN_CONTROL",
        41992: "CONTRAST",
        41993: "SATURATION",
        41994: "SHARPNESS",
        41995: "DEVICE_SETTING_DESCRIPTION",
        41996: "SUBJECT_DISTANCE_RANGE",
        42016: "IMAGE_UNIQUE_ID",
        42032: "OWNER_NAME",
        42033: "SERIAL_NUMBER",
        42034: "LENS_INFO",
        42035: "LENS_MAKE",
        42036: "LENS_MODEL",
        42037: "LENS_SERIAL_NUMBER",
        42112: "GDAL_METADATA",
        42113: "GDAL_NO_DATA",
        42240: "GAMMA",
        44992: "EXPAND_SOFTWARE",
        44993: "EXPAND_LENS",
        44994: "EXPAND_FILM",
        44995: "EXPAND_FILTER_LENS",
        44996: "EXPAND_SCANNER",
        44997: "EXPAND_FLASH_LAMP",
        48129: "PIXEL_FORMAT",
        48130: "TRANSFORMATION",
        48131: "UNCOMPRESSED",
        48132: "IMAGE_TYPE",
        48256: "IMAGE_WIDTH2",
        48257: "IMAGE_HEIGHT2",
        48258: "WIDTH_RESOLUTION",
        48259: "HEIGHT_RESOLUTION",
        48320: "IMAGE_OFFSET",
        48321: "IMAGE_BYTE_COUNT",
        48322: "ALPHA_OFFSET",
        48323: "ALPHA_BYTE_COUNT",
        48324: "IMAGE_DATA_DISCARD",
        48325: "ALPHA_DATA_DISCARD",
        50215: "OCE_SCANJOB_DESC",
        50216: "OCE_APPLICATION_SELECTOR",
        50217: "OCE_ID_NUMBER",
        50218: "OCE_IMAGE_LOGIC",
        50255: "ANNOTATIONS",
        50341: "PRINT_IM",
        50547: "ORIGINAL_FILE_NAME",
        50560: "USPTO_ORIGINAL_CONTENT_TYPE",
        50706: "DNG_VERSION",
        50707: "DNG_BACKWARD_VERSION",
        50708: "UNIQUE_CAMERA_MODEL",
        50709: "LOCALIZED_CAMERA_MODEL",
        50710: "CFA_PLANE_COLOR",
        50711: "CFA_LAYOUT",
        50712: "LINEARIZATION_TABLE",
        50713: "BLACK_LEVEL_REPEAT_DIM",
        50714: "BLACK_LEVEL",
        50715: "BLACK_LEVEL_DELTA_H",
        50716: "BLACK_LEVEL_DELTA_V",
        50717: "WHITE_LEVEL",
        50718: "DEFAULT_SCALE",
        50719: "DEFAULT_CROP_ORIGIN",
        50720: "DEFAULT_CROP_SIZE",
        50721: "COLOR_MATRIX1",
        50722: "COLOR_MATRIX2",
        50723: "CAMERA_CALIBRATION1",
        50724: "CAMERA_CALIBRATION2",
        50725: "REDUCTION_MATRIX1",
        50726: "REDUCTION_MATRIX2",
        50727: "ANALOG_BALANCE",
        50728: "AS_SHOT_NEUTRAL",
        50729: "AS_SHOT_WHITE_XY",
        50730: "BASELINE_EXPOSURE",
        50731: "BASELINE_NOISE",
        50732: "BASELINE_SHARPNESS",
        50733: "BAYER_GREEN_SPLIT",
        50734: "LINEAR_RESPONSE_LIMIT",
        50735: "CAMERA_SERIAL_NUMBER",
        50736: "DNG_LENS_INFO",
        50737: "CHROMA_BLUR_RADIUS",
        50738: "ANTI_ALIAS_STRENGTH",
        50739: "SHADOW_SCALE",
        50740: "SR2_PRIVATE",
        50741: "MAKER_NOTE_SAFETY",
        50752: "RAW_IMAGE_SEGMENTATION",
        50778: "CALIBRATION_ILLUMINANT1",
        50779: "CALIBRATION_ILLUMINANT2",
        50780: "BEST_QUALITY_SCALE",
        50781: "RAW_DATA_UNIQUE_ID",
        50784: "ALIAS_LAYER_METADATA",
        50827: "ORIGINAL_RAW_FILE_NAME",
        50828: "ORIGINAL_RAW_FILE_DATA",
        50829: "ACTIVE_AREA",
        50830: "MASKED_AREAS",
        50831: "AS_SHOT_ICC_PROFILE",
        50832: "AS_SHOT_PRE_PROFILE_MATRIX",
        50833: "CURRENT_ICC_PROFILE",
        50834: "CURRENT_PRE_PROFILE_MATRIX",
        50879: "COLORIMETRIC_REFERENCE",
        50885: "S_RAW_TYPE",
        50898: "PANASONIC_TITLE",
        50899: "PANASONIC_TITLE2",
        50931: "CAMERA_CALIBRATION_SIG",
        50932: "PROFILE_CALIBRATION_SIG",
        50933: "PROFILE_IFD",
        50934: "AS_SHOT_PROFILE_NAME",
        50935: "NOISE_REDUCTION_APPLIED",
        50936: "PROFILE_NAME",
        50937: "PROFILE_HUE_SAT_MAP_DIMS",
        50938: "PROFILE_HUE_SAT_MAP_DATA1",
        50939: "PROFILE_HUE_SAT_MAP_DATA2",
        50940: "PROFILE_TONE_CURVE",
        50941: "PROFILE_EMBED_POLICY",
        50942: "PROFILE_COPYRIGHT",
        50964: "FORWARD_MATRIX1",
        50965: "FORWARD_MATRIX2",
        50966: "PREVIEW_APPLICATION_NAME",
        50967: "PREVIEW_APPLICATION_VERSION",
        50968: "PREVIEW_SETTINGS_NAME",
        50969: "PREVIEW_SETTINGS_DIGEST",
        50970: "PREVIEW_COLOR_SPACE",
        50971: "PREVIEW_DATE_TIME",
        50972: "RAW_IMAGE_DIGEST",
        50973: "ORIGINAL_RAW_FILE_DIGEST",
        50974: "SUB_TILE_BLOCK_SIZE",
        50975: "ROW_INTERLEAVE_FACTOR",
        50981: "PROFILE_LOOK_TABLE_DIMS",
        50982: "PROFILE_LOOK_TABLE_DATA",
        51008: "OPCODE_LIST1",
        51009: "OPCODE_LIST2",
        51022: "OPCODE_LIST3",
        51041: "NOISE_PROFILE",
        51043: "TIME_CODES",
        51044: "FRAME_RATE",
        51058: "T_STOP",
        51081: "REEL_NAME",
        51089: "ORIGINAL_DEFAULT_FINAL_SIZE",
        51090: "ORIGINAL_BEST_QUALITY_SIZE",
        51091: "ORIGINAL_DEFAULT_CROP_SIZE",
        51105: "CAMERA_LABEL",
        51107: "PROFILE_HUE_SAT_MAP_ENCODING",
        51108: "PROFILE_LOOK_TABLE_ENCODING",
        51109: "BASELINE_EXPOSURE_OFFSET",
        51110: "DEFAULT_BLACK_RENDER",
        51111: "NEW_RAW_IMAGE_DIGEST",
        51112: "RAW_TO_PREVIEW_GAIN",
        51125: "DEFAULT_USER_CROP",
        59932: "PADDING",
        59933: "OFFSET_SCHEMA",
        65000: "OWNER_NAME2",
        65001: "SERIAL_NUMBER2",
        65002: "LENS",
        65024: "KDC_IFD",
        65100: "RAW_FILE",
        65101: "CONVERTER",
        65102: "WHITE_BALANCE2",
        65105: "EXPOSURE",
        65106: "SHADOWS",
        65107: "BRIGHTNESS",
        65108: "CONTRAST2",
        65109: "SATURATION2",
        65110: "SHARPNESS2",
        65111: "SMOOTHNESS",
        65112: "MOIRE_FILTER",
      });

      function IfdField(_io, _parent, _root, _is_le) {
        this._io = _io;
        this._parent = _parent;
        this._root = _root || this;
        this._is_le = _is_le;

        this._read();
      }
      IfdField.prototype._read = function() {

        if (this._is_le === true) {
          this._readLE();
        } else if (this._is_le === false) {
          this._readBE();
        } else {
          throw new KaitaiStream.UndecidedEndiannessError();
        }
      }
      IfdField.prototype._readLE = function() {
        this.tag = this._io.readU2le();
        this.fieldType = this._io.readU2le();
        this.length = this._io.readU4le();
        this.ofsOrData = this._io.readU4le();
      }
      IfdField.prototype._readBE = function() {
        this.tag = this._io.readU2be();
        this.fieldType = this._io.readU2be();
        this.length = this._io.readU4be();
        this.ofsOrData = this._io.readU4be();
      }
      Object.defineProperty(IfdField.prototype, 'typeByteLength', {
        get: function() {
          if (this._m_typeByteLength !== undefined)
            return this._m_typeByteLength;
          this._m_typeByteLength = (this.fieldType == Exif.ExifBody.IfdField.FieldTypeEnum.WORD ? 2 : (this.fieldType == Exif.ExifBody.IfdField.FieldTypeEnum.DWORD ? 4 : 1));
          return this._m_typeByteLength;
        }
      });
      Object.defineProperty(IfdField.prototype, 'byteLength', {
        get: function() {
          if (this._m_byteLength !== undefined)
            return this._m_byteLength;
          this._m_byteLength = (this.length * this.typeByteLength);
          return this._m_byteLength;
        }
      });
      Object.defineProperty(IfdField.prototype, 'isImmediateData', {
        get: function() {
          if (this._m_isImmediateData !== undefined)
            return this._m_isImmediateData;
          this._m_isImmediateData = this.byteLength <= 4;
          return this._m_isImmediateData;
        }
      });
      Object.defineProperty(IfdField.prototype, 'data', {
        get: function() {
          if (this._m_data !== undefined)
            return this._m_data;
          if (!(this.isImmediateData)) {
            var io = this._root._io;
            var _pos = io.pos;
            io.seek(this.ofsOrData);
            if (this._is_le) {
              this._m_data = io.readBytes(this.byteLength);
            } else {
              this._m_data = io.readBytes(this.byteLength);
            }
            io.seek(_pos);
          }
          return this._m_data;
        }
      });

      return IfdField;
    })();
    Object.defineProperty(ExifBody.prototype, 'ifd0', {
      get: function() {
        if (this._m_ifd0 !== undefined)
          return this._m_ifd0;
        var _pos = this._io.pos;
        this._io.seek(this.ifd0Ofs);
        if (this._is_le) {
          this._m_ifd0 = new Ifd(this._io, this, this._root, this._is_le);
        } else {
          this._m_ifd0 = new Ifd(this._io, this, this._root, this._is_le);
        }
        this._io.seek(_pos);
        return this._m_ifd0;
      }
    });

    return ExifBody;
  })();

  return Exif;
})();
return Exif;
}));