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.
All parsing code for Ruby generated by Kaitai Struct depends on the Ruby runtime library. You have to install it before you can parse data.
The Ruby runtime library can be installed from RubyGems:
gem install kaitai-structParse a local file and get structure in memory:
data = Exif.from_file("path/to/local/file.bin")
Or parse structure from a string of bytes:
bytes = "\x00\x01\x02..."
data = Exif.new(Kaitai::Struct::Stream.new(bytes))
After that, one can get various attributes from the structure by invoking getter methods like:
data.endianness # => get endianness
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
require 'kaitai/struct/struct'
unless Gem::Version.new(Kaitai::Struct::VERSION) >= Gem::Version.new('0.9')
raise "Incompatible Kaitai Struct Ruby API: 0.9 or later is required, but you have #{Kaitai::Struct::VERSION}"
end
class Exif < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
@endianness = @_io.read_u2le
@body = ExifBody.new(@_io, self, @_root)
self
end
class ExifBody < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
case _root.endianness
when 18761
@_is_le = true
when 19789
@_is_le = false
end
if @_is_le == true
_read_le
elsif @_is_le == false
_read_be
else
raise Kaitai::Struct::UndecidedEndiannessError.new("/types/exif_body")
end
self
end
def _read_le
@version = @_io.read_u2le
@ifd0_ofs = @_io.read_u4le
self
end
def _read_be
@version = @_io.read_u2be
@ifd0_ofs = @_io.read_u4be
self
end
class Ifd < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self, _is_le = nil)
super(_io, _parent, _root)
@_is_le = _is_le
_read
end
def _read
if @_is_le == true
_read_le
elsif @_is_le == false
_read_be
else
raise Kaitai::Struct::UndecidedEndiannessError.new("/types/exif_body/types/ifd")
end
self
end
def _read_le
@num_fields = @_io.read_u2le
@fields = []
(num_fields).times { |i|
@fields << IfdField.new(@_io, self, @_root, @_is_le)
}
@next_ifd_ofs = @_io.read_u4le
self
end
def _read_be
@num_fields = @_io.read_u2be
@fields = []
(num_fields).times { |i|
@fields << IfdField.new(@_io, self, @_root, @_is_le)
}
@next_ifd_ofs = @_io.read_u4be
self
end
def next_ifd
return @next_ifd unless @next_ifd.nil?
if next_ifd_ofs != 0
_pos = @_io.pos
@_io.seek(next_ifd_ofs)
if @_is_le
@next_ifd = Ifd.new(@_io, self, @_root, @_is_le)
else
@next_ifd = Ifd.new(@_io, self, @_root, @_is_le)
end
@_io.seek(_pos)
end
@next_ifd
end
attr_reader :num_fields
attr_reader :fields
attr_reader :next_ifd_ofs
end
class IfdField < Kaitai::Struct::Struct
FIELD_TYPE_ENUM = {
1 => :field_type_enum_byte,
2 => :field_type_enum_ascii_string,
3 => :field_type_enum_word,
4 => :field_type_enum_dword,
5 => :field_type_enum_rational,
7 => :field_type_enum_undefined,
9 => :field_type_enum_slong,
10 => :field_type_enum_srational,
}
I__FIELD_TYPE_ENUM = FIELD_TYPE_ENUM.invert
TAG_ENUM = {
256 => :tag_enum_image_width,
257 => :tag_enum_image_height,
258 => :tag_enum_bits_per_sample,
259 => :tag_enum_compression,
262 => :tag_enum_photometric_interpretation,
263 => :tag_enum_thresholding,
264 => :tag_enum_cell_width,
265 => :tag_enum_cell_length,
266 => :tag_enum_fill_order,
269 => :tag_enum_document_name,
270 => :tag_enum_image_description,
271 => :tag_enum_make,
272 => :tag_enum_model,
273 => :tag_enum_strip_offsets,
274 => :tag_enum_orientation,
277 => :tag_enum_samples_per_pixel,
278 => :tag_enum_rows_per_strip,
279 => :tag_enum_strip_byte_counts,
280 => :tag_enum_min_sample_value,
281 => :tag_enum_max_sample_value,
282 => :tag_enum_x_resolution,
283 => :tag_enum_y_resolution,
284 => :tag_enum_planar_configuration,
285 => :tag_enum_page_name,
286 => :tag_enum_x_position,
287 => :tag_enum_y_position,
288 => :tag_enum_free_offsets,
289 => :tag_enum_free_byte_counts,
290 => :tag_enum_gray_response_unit,
291 => :tag_enum_gray_response_curve,
292 => :tag_enum_t4_options,
293 => :tag_enum_t6_options,
296 => :tag_enum_resolution_unit,
297 => :tag_enum_page_number,
300 => :tag_enum_color_response_unit,
301 => :tag_enum_transfer_function,
305 => :tag_enum_software,
306 => :tag_enum_modify_date,
315 => :tag_enum_artist,
316 => :tag_enum_host_computer,
317 => :tag_enum_predictor,
318 => :tag_enum_white_point,
319 => :tag_enum_primary_chromaticities,
320 => :tag_enum_color_map,
321 => :tag_enum_halftone_hints,
322 => :tag_enum_tile_width,
323 => :tag_enum_tile_length,
324 => :tag_enum_tile_offsets,
325 => :tag_enum_tile_byte_counts,
326 => :tag_enum_bad_fax_lines,
327 => :tag_enum_clean_fax_data,
328 => :tag_enum_consecutive_bad_fax_lines,
330 => :tag_enum_sub_ifd,
332 => :tag_enum_ink_set,
333 => :tag_enum_ink_names,
334 => :tag_enum_numberof_inks,
336 => :tag_enum_dot_range,
337 => :tag_enum_target_printer,
338 => :tag_enum_extra_samples,
339 => :tag_enum_sample_format,
340 => :tag_enum_s_min_sample_value,
341 => :tag_enum_s_max_sample_value,
342 => :tag_enum_transfer_range,
343 => :tag_enum_clip_path,
344 => :tag_enum_x_clip_path_units,
345 => :tag_enum_y_clip_path_units,
346 => :tag_enum_indexed,
347 => :tag_enum_jpeg_tables,
351 => :tag_enum_opi_proxy,
400 => :tag_enum_global_parameters_ifd,
401 => :tag_enum_profile_type,
402 => :tag_enum_fax_profile,
403 => :tag_enum_coding_methods,
404 => :tag_enum_version_year,
405 => :tag_enum_mode_number,
433 => :tag_enum_decode,
434 => :tag_enum_default_image_color,
435 => :tag_enum_t82_options,
437 => :tag_enum_jpeg_tables2,
512 => :tag_enum_jpeg_proc,
513 => :tag_enum_thumbnail_offset,
514 => :tag_enum_thumbnail_length,
515 => :tag_enum_jpeg_restart_interval,
517 => :tag_enum_jpeg_lossless_predictors,
518 => :tag_enum_jpeg_point_transforms,
519 => :tag_enum_jpegq_tables,
520 => :tag_enum_jpegdc_tables,
521 => :tag_enum_jpegac_tables,
529 => :tag_enum_y_cb_cr_coefficients,
530 => :tag_enum_y_cb_cr_sub_sampling,
531 => :tag_enum_y_cb_cr_positioning,
532 => :tag_enum_reference_black_white,
559 => :tag_enum_strip_row_counts,
700 => :tag_enum_application_notes,
999 => :tag_enum_uspto_miscellaneous,
4096 => :tag_enum_related_image_file_format,
4097 => :tag_enum_related_image_width,
4098 => :tag_enum_related_image_height,
18246 => :tag_enum_rating,
18247 => :tag_enum_xp_dip_xml,
18248 => :tag_enum_stitch_info,
18249 => :tag_enum_rating_percent,
28672 => :tag_enum_sony_raw_file_type,
28722 => :tag_enum_light_falloff_params,
28725 => :tag_enum_chromatic_aberration_corr_params,
28727 => :tag_enum_distortion_corr_params,
32781 => :tag_enum_image_id,
32931 => :tag_enum_wang_tag1,
32932 => :tag_enum_wang_annotation,
32933 => :tag_enum_wang_tag3,
32934 => :tag_enum_wang_tag4,
32953 => :tag_enum_image_reference_points,
32954 => :tag_enum_region_xform_tack_point,
32955 => :tag_enum_warp_quadrilateral,
32956 => :tag_enum_affine_transform_mat,
32995 => :tag_enum_matteing,
32996 => :tag_enum_data_type,
32997 => :tag_enum_image_depth,
32998 => :tag_enum_tile_depth,
33300 => :tag_enum_image_full_width,
33301 => :tag_enum_image_full_height,
33302 => :tag_enum_texture_format,
33303 => :tag_enum_wrap_modes,
33304 => :tag_enum_fov_cot,
33305 => :tag_enum_matrix_world_to_screen,
33306 => :tag_enum_matrix_world_to_camera,
33405 => :tag_enum_model2,
33421 => :tag_enum_cfa_repeat_pattern_dim,
33422 => :tag_enum_cfa_pattern2,
33423 => :tag_enum_battery_level,
33424 => :tag_enum_kodak_ifd,
33432 => :tag_enum_copyright,
33434 => :tag_enum_exposure_time,
33437 => :tag_enum_f_number,
33445 => :tag_enum_md_file_tag,
33446 => :tag_enum_md_scale_pixel,
33447 => :tag_enum_md_color_table,
33448 => :tag_enum_md_lab_name,
33449 => :tag_enum_md_sample_info,
33450 => :tag_enum_md_prep_date,
33451 => :tag_enum_md_prep_time,
33452 => :tag_enum_md_file_units,
33550 => :tag_enum_pixel_scale,
33589 => :tag_enum_advent_scale,
33590 => :tag_enum_advent_revision,
33628 => :tag_enum_uic1_tag,
33629 => :tag_enum_uic2_tag,
33630 => :tag_enum_uic3_tag,
33631 => :tag_enum_uic4_tag,
33723 => :tag_enum_iptc_naa,
33918 => :tag_enum_intergraph_packet_data,
33919 => :tag_enum_intergraph_flag_registers,
33920 => :tag_enum_intergraph_matrix,
33921 => :tag_enum_ingr_reserved,
33922 => :tag_enum_model_tie_point,
34016 => :tag_enum_site,
34017 => :tag_enum_color_sequence,
34018 => :tag_enum_it8_header,
34019 => :tag_enum_raster_padding,
34020 => :tag_enum_bits_per_run_length,
34021 => :tag_enum_bits_per_extended_run_length,
34022 => :tag_enum_color_table,
34023 => :tag_enum_image_color_indicator,
34024 => :tag_enum_background_color_indicator,
34025 => :tag_enum_image_color_value,
34026 => :tag_enum_background_color_value,
34027 => :tag_enum_pixel_intensity_range,
34028 => :tag_enum_transparency_indicator,
34029 => :tag_enum_color_characterization,
34030 => :tag_enum_hc_usage,
34031 => :tag_enum_trap_indicator,
34032 => :tag_enum_cmyk_equivalent,
34118 => :tag_enum_sem_info,
34152 => :tag_enum_afcp_iptc,
34232 => :tag_enum_pixel_magic_jbig_options,
34263 => :tag_enum_jpl_carto_ifd,
34264 => :tag_enum_model_transform,
34306 => :tag_enum_wb_grgb_levels,
34310 => :tag_enum_leaf_data,
34377 => :tag_enum_photoshop_settings,
34665 => :tag_enum_exif_offset,
34675 => :tag_enum_icc_profile,
34687 => :tag_enum_tiff_fx_extensions,
34688 => :tag_enum_multi_profiles,
34689 => :tag_enum_shared_data,
34690 => :tag_enum_t88_options,
34732 => :tag_enum_image_layer,
34735 => :tag_enum_geo_tiff_directory,
34736 => :tag_enum_geo_tiff_double_params,
34737 => :tag_enum_geo_tiff_ascii_params,
34750 => :tag_enum_jbig_options,
34850 => :tag_enum_exposure_program,
34852 => :tag_enum_spectral_sensitivity,
34853 => :tag_enum_gps_info,
34855 => :tag_enum_iso,
34856 => :tag_enum_opto_electric_conv_factor,
34857 => :tag_enum_interlace,
34858 => :tag_enum_time_zone_offset,
34859 => :tag_enum_self_timer_mode,
34864 => :tag_enum_sensitivity_type,
34865 => :tag_enum_standard_output_sensitivity,
34866 => :tag_enum_recommended_exposure_index,
34867 => :tag_enum_iso_speed,
34868 => :tag_enum_iso_speed_latitudeyyy,
34869 => :tag_enum_iso_speed_latitudezzz,
34908 => :tag_enum_fax_recv_params,
34909 => :tag_enum_fax_sub_address,
34910 => :tag_enum_fax_recv_time,
34929 => :tag_enum_fedex_edr,
34954 => :tag_enum_leaf_sub_ifd,
36864 => :tag_enum_exif_version,
36867 => :tag_enum_date_time_original,
36868 => :tag_enum_create_date,
36873 => :tag_enum_google_plus_upload_code,
36880 => :tag_enum_offset_time,
36881 => :tag_enum_offset_time_original,
36882 => :tag_enum_offset_time_digitized,
37121 => :tag_enum_components_configuration,
37122 => :tag_enum_compressed_bits_per_pixel,
37377 => :tag_enum_shutter_speed_value,
37378 => :tag_enum_aperture_value,
37379 => :tag_enum_brightness_value,
37380 => :tag_enum_exposure_compensation,
37381 => :tag_enum_max_aperture_value,
37382 => :tag_enum_subject_distance,
37383 => :tag_enum_metering_mode,
37384 => :tag_enum_light_source,
37385 => :tag_enum_flash,
37386 => :tag_enum_focal_length,
37387 => :tag_enum_flash_energy,
37388 => :tag_enum_spatial_frequency_response,
37389 => :tag_enum_noise,
37390 => :tag_enum_focal_plane_x_resolution,
37391 => :tag_enum_focal_plane_y_resolution,
37392 => :tag_enum_focal_plane_resolution_unit,
37393 => :tag_enum_image_number,
37394 => :tag_enum_security_classification,
37395 => :tag_enum_image_history,
37396 => :tag_enum_subject_area,
37397 => :tag_enum_exposure_index,
37398 => :tag_enum_tiff_ep_standard_id,
37399 => :tag_enum_sensing_method,
37434 => :tag_enum_cip3_data_file,
37435 => :tag_enum_cip3_sheet,
37436 => :tag_enum_cip3_side,
37439 => :tag_enum_sto_nits,
37500 => :tag_enum_maker_note,
37510 => :tag_enum_user_comment,
37520 => :tag_enum_sub_sec_time,
37521 => :tag_enum_sub_sec_time_original,
37522 => :tag_enum_sub_sec_time_digitized,
37679 => :tag_enum_ms_document_text,
37680 => :tag_enum_ms_property_set_storage,
37681 => :tag_enum_ms_document_text_position,
37724 => :tag_enum_image_source_data,
37888 => :tag_enum_ambient_temperature,
37889 => :tag_enum_humidity,
37890 => :tag_enum_pressure,
37891 => :tag_enum_water_depth,
37892 => :tag_enum_acceleration,
37893 => :tag_enum_camera_elevation_angle,
40091 => :tag_enum_xp_title,
40092 => :tag_enum_xp_comment,
40093 => :tag_enum_xp_author,
40094 => :tag_enum_xp_keywords,
40095 => :tag_enum_xp_subject,
40960 => :tag_enum_flashpix_version,
40961 => :tag_enum_color_space,
40962 => :tag_enum_exif_image_width,
40963 => :tag_enum_exif_image_height,
40964 => :tag_enum_related_sound_file,
40965 => :tag_enum_interop_offset,
40976 => :tag_enum_samsung_raw_pointers_offset,
40977 => :tag_enum_samsung_raw_pointers_length,
41217 => :tag_enum_samsung_raw_byte_order,
41218 => :tag_enum_samsung_raw_unknown,
41483 => :tag_enum_flash_energy2,
41484 => :tag_enum_spatial_frequency_response2,
41485 => :tag_enum_noise2,
41486 => :tag_enum_focal_plane_x_resolution2,
41487 => :tag_enum_focal_plane_y_resolution2,
41488 => :tag_enum_focal_plane_resolution_unit2,
41489 => :tag_enum_image_number2,
41490 => :tag_enum_security_classification2,
41491 => :tag_enum_image_history2,
41492 => :tag_enum_subject_location,
41493 => :tag_enum_exposure_index2,
41494 => :tag_enum_tiff_ep_standard_id2,
41495 => :tag_enum_sensing_method2,
41728 => :tag_enum_file_source,
41729 => :tag_enum_scene_type,
41730 => :tag_enum_cfa_pattern,
41985 => :tag_enum_custom_rendered,
41986 => :tag_enum_exposure_mode,
41987 => :tag_enum_white_balance,
41988 => :tag_enum_digital_zoom_ratio,
41989 => :tag_enum_focal_length_in35mm_format,
41990 => :tag_enum_scene_capture_type,
41991 => :tag_enum_gain_control,
41992 => :tag_enum_contrast,
41993 => :tag_enum_saturation,
41994 => :tag_enum_sharpness,
41995 => :tag_enum_device_setting_description,
41996 => :tag_enum_subject_distance_range,
42016 => :tag_enum_image_unique_id,
42032 => :tag_enum_owner_name,
42033 => :tag_enum_serial_number,
42034 => :tag_enum_lens_info,
42035 => :tag_enum_lens_make,
42036 => :tag_enum_lens_model,
42037 => :tag_enum_lens_serial_number,
42112 => :tag_enum_gdal_metadata,
42113 => :tag_enum_gdal_no_data,
42240 => :tag_enum_gamma,
44992 => :tag_enum_expand_software,
44993 => :tag_enum_expand_lens,
44994 => :tag_enum_expand_film,
44995 => :tag_enum_expand_filter_lens,
44996 => :tag_enum_expand_scanner,
44997 => :tag_enum_expand_flash_lamp,
48129 => :tag_enum_pixel_format,
48130 => :tag_enum_transformation,
48131 => :tag_enum_uncompressed,
48132 => :tag_enum_image_type,
48256 => :tag_enum_image_width2,
48257 => :tag_enum_image_height2,
48258 => :tag_enum_width_resolution,
48259 => :tag_enum_height_resolution,
48320 => :tag_enum_image_offset,
48321 => :tag_enum_image_byte_count,
48322 => :tag_enum_alpha_offset,
48323 => :tag_enum_alpha_byte_count,
48324 => :tag_enum_image_data_discard,
48325 => :tag_enum_alpha_data_discard,
50215 => :tag_enum_oce_scanjob_desc,
50216 => :tag_enum_oce_application_selector,
50217 => :tag_enum_oce_id_number,
50218 => :tag_enum_oce_image_logic,
50255 => :tag_enum_annotations,
50341 => :tag_enum_print_im,
50547 => :tag_enum_original_file_name,
50560 => :tag_enum_uspto_original_content_type,
50706 => :tag_enum_dng_version,
50707 => :tag_enum_dng_backward_version,
50708 => :tag_enum_unique_camera_model,
50709 => :tag_enum_localized_camera_model,
50710 => :tag_enum_cfa_plane_color,
50711 => :tag_enum_cfa_layout,
50712 => :tag_enum_linearization_table,
50713 => :tag_enum_black_level_repeat_dim,
50714 => :tag_enum_black_level,
50715 => :tag_enum_black_level_delta_h,
50716 => :tag_enum_black_level_delta_v,
50717 => :tag_enum_white_level,
50718 => :tag_enum_default_scale,
50719 => :tag_enum_default_crop_origin,
50720 => :tag_enum_default_crop_size,
50721 => :tag_enum_color_matrix1,
50722 => :tag_enum_color_matrix2,
50723 => :tag_enum_camera_calibration1,
50724 => :tag_enum_camera_calibration2,
50725 => :tag_enum_reduction_matrix1,
50726 => :tag_enum_reduction_matrix2,
50727 => :tag_enum_analog_balance,
50728 => :tag_enum_as_shot_neutral,
50729 => :tag_enum_as_shot_white_xy,
50730 => :tag_enum_baseline_exposure,
50731 => :tag_enum_baseline_noise,
50732 => :tag_enum_baseline_sharpness,
50733 => :tag_enum_bayer_green_split,
50734 => :tag_enum_linear_response_limit,
50735 => :tag_enum_camera_serial_number,
50736 => :tag_enum_dng_lens_info,
50737 => :tag_enum_chroma_blur_radius,
50738 => :tag_enum_anti_alias_strength,
50739 => :tag_enum_shadow_scale,
50740 => :tag_enum_sr2_private,
50741 => :tag_enum_maker_note_safety,
50752 => :tag_enum_raw_image_segmentation,
50778 => :tag_enum_calibration_illuminant1,
50779 => :tag_enum_calibration_illuminant2,
50780 => :tag_enum_best_quality_scale,
50781 => :tag_enum_raw_data_unique_id,
50784 => :tag_enum_alias_layer_metadata,
50827 => :tag_enum_original_raw_file_name,
50828 => :tag_enum_original_raw_file_data,
50829 => :tag_enum_active_area,
50830 => :tag_enum_masked_areas,
50831 => :tag_enum_as_shot_icc_profile,
50832 => :tag_enum_as_shot_pre_profile_matrix,
50833 => :tag_enum_current_icc_profile,
50834 => :tag_enum_current_pre_profile_matrix,
50879 => :tag_enum_colorimetric_reference,
50885 => :tag_enum_s_raw_type,
50898 => :tag_enum_panasonic_title,
50899 => :tag_enum_panasonic_title2,
50931 => :tag_enum_camera_calibration_sig,
50932 => :tag_enum_profile_calibration_sig,
50933 => :tag_enum_profile_ifd,
50934 => :tag_enum_as_shot_profile_name,
50935 => :tag_enum_noise_reduction_applied,
50936 => :tag_enum_profile_name,
50937 => :tag_enum_profile_hue_sat_map_dims,
50938 => :tag_enum_profile_hue_sat_map_data1,
50939 => :tag_enum_profile_hue_sat_map_data2,
50940 => :tag_enum_profile_tone_curve,
50941 => :tag_enum_profile_embed_policy,
50942 => :tag_enum_profile_copyright,
50964 => :tag_enum_forward_matrix1,
50965 => :tag_enum_forward_matrix2,
50966 => :tag_enum_preview_application_name,
50967 => :tag_enum_preview_application_version,
50968 => :tag_enum_preview_settings_name,
50969 => :tag_enum_preview_settings_digest,
50970 => :tag_enum_preview_color_space,
50971 => :tag_enum_preview_date_time,
50972 => :tag_enum_raw_image_digest,
50973 => :tag_enum_original_raw_file_digest,
50974 => :tag_enum_sub_tile_block_size,
50975 => :tag_enum_row_interleave_factor,
50981 => :tag_enum_profile_look_table_dims,
50982 => :tag_enum_profile_look_table_data,
51008 => :tag_enum_opcode_list1,
51009 => :tag_enum_opcode_list2,
51022 => :tag_enum_opcode_list3,
51041 => :tag_enum_noise_profile,
51043 => :tag_enum_time_codes,
51044 => :tag_enum_frame_rate,
51058 => :tag_enum_t_stop,
51081 => :tag_enum_reel_name,
51089 => :tag_enum_original_default_final_size,
51090 => :tag_enum_original_best_quality_size,
51091 => :tag_enum_original_default_crop_size,
51105 => :tag_enum_camera_label,
51107 => :tag_enum_profile_hue_sat_map_encoding,
51108 => :tag_enum_profile_look_table_encoding,
51109 => :tag_enum_baseline_exposure_offset,
51110 => :tag_enum_default_black_render,
51111 => :tag_enum_new_raw_image_digest,
51112 => :tag_enum_raw_to_preview_gain,
51125 => :tag_enum_default_user_crop,
59932 => :tag_enum_padding,
59933 => :tag_enum_offset_schema,
65000 => :tag_enum_owner_name2,
65001 => :tag_enum_serial_number2,
65002 => :tag_enum_lens,
65024 => :tag_enum_kdc_ifd,
65100 => :tag_enum_raw_file,
65101 => :tag_enum_converter,
65102 => :tag_enum_white_balance2,
65105 => :tag_enum_exposure,
65106 => :tag_enum_shadows,
65107 => :tag_enum_brightness,
65108 => :tag_enum_contrast2,
65109 => :tag_enum_saturation2,
65110 => :tag_enum_sharpness2,
65111 => :tag_enum_smoothness,
65112 => :tag_enum_moire_filter,
}
I__TAG_ENUM = TAG_ENUM.invert
def initialize(_io, _parent = nil, _root = self, _is_le = nil)
super(_io, _parent, _root)
@_is_le = _is_le
_read
end
def _read
if @_is_le == true
_read_le
elsif @_is_le == false
_read_be
else
raise Kaitai::Struct::UndecidedEndiannessError.new("/types/exif_body/types/ifd_field")
end
self
end
def _read_le
@tag = Kaitai::Struct::Stream::resolve_enum(TAG_ENUM, @_io.read_u2le)
@field_type = Kaitai::Struct::Stream::resolve_enum(FIELD_TYPE_ENUM, @_io.read_u2le)
@length = @_io.read_u4le
@ofs_or_data = @_io.read_u4le
self
end
def _read_be
@tag = Kaitai::Struct::Stream::resolve_enum(TAG_ENUM, @_io.read_u2be)
@field_type = Kaitai::Struct::Stream::resolve_enum(FIELD_TYPE_ENUM, @_io.read_u2be)
@length = @_io.read_u4be
@ofs_or_data = @_io.read_u4be
self
end
def type_byte_length
return @type_byte_length unless @type_byte_length.nil?
@type_byte_length = (field_type == :field_type_enum_word ? 2 : (field_type == :field_type_enum_dword ? 4 : 1))
@type_byte_length
end
def byte_length
return @byte_length unless @byte_length.nil?
@byte_length = (length * type_byte_length)
@byte_length
end
def is_immediate_data
return @is_immediate_data unless @is_immediate_data.nil?
@is_immediate_data = byte_length <= 4
@is_immediate_data
end
def data
return @data unless @data.nil?
if !(is_immediate_data)
io = _root._io
_pos = io.pos
io.seek(ofs_or_data)
if @_is_le
@data = io.read_bytes(byte_length)
else
@data = io.read_bytes(byte_length)
end
io.seek(_pos)
end
@data
end
attr_reader :tag
attr_reader :field_type
attr_reader :length
attr_reader :ofs_or_data
end
def ifd0
return @ifd0 unless @ifd0.nil?
_pos = @_io.pos
@_io.seek(ifd0_ofs)
if @_is_le
@ifd0 = Ifd.new(@_io, self, @_root, @_is_le)
else
@ifd0 = Ifd.new(@_io, self, @_root, @_is_le)
end
@_io.seek(_pos)
@ifd0
end
attr_reader :version
attr_reader :ifd0_ofs
end
attr_reader :endianness
attr_reader :body
end