Add jpeg app0 sof0 com parsing

2 files changed, 764 insertions, 0 deletions

diff --git a/mitmproxy/contrib/kaitaistruct/exif.py b/mitmproxy/contrib/kaitaistruct/exif.py
new file mode 100644
index 00000000..f2356f42
--- /dev/null
+++ b/mitmproxy/contrib/kaitaistruct/exif.py
@@ -0,0 +1,573 @@
+# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+
+import array
+import struct
+import zlib
+from enum import Enum
+
+from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
+
+
+class Exif(KaitaiStruct):
+    def __init__(self, _io, _parent=None, _root=None):
+        self._io = _io
+        self._parent = _parent
+        self._root = _root if _root else self
+        self.endianness = self._io.read_bytes(2)
+        self.version = self._io.read_u2be()
+        self.ifd0_ofs = self._io.read_u4be()
+
+    class Ifd(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.num_fields = self._io.read_u2be()
+            self.fields = [None] * (self.num_fields)
+            for i in range(self.num_fields):
+                self.fields[i] = self._root.IfdField(self._io, self, self._root)
+
+            self.next_ifd_ofs = self._io.read_u4be()
+
+        @property
+        def next_ifd(self):
+            if hasattr(self, '_m_next_ifd'):
+                return self._m_next_ifd if hasattr(self, '_m_next_ifd') else None
+
+            if self.next_ifd_ofs != 0:
+                _pos = self._io.pos()
+                self._io.seek(self.next_ifd_ofs)
+                self._m_next_ifd = self._root.Ifd(self._io, self, self._root)
+                self._io.seek(_pos)
+
+            return self._m_next_ifd if hasattr(self, '_m_next_ifd') else None
+
+
+    class IfdField(KaitaiStruct):
+
+        class FieldTypeEnum(Enum):
+            byte = 1
+            ascii_string = 2
+            word = 3
+            dword = 4
+            rational = 5
+
+        class TagEnum(Enum):
+            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
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.tag = self._root.IfdField.TagEnum(self._io.read_u2be())
+            self.field_type = self._root.IfdField.FieldTypeEnum(self._io.read_u2be())
+            self.length = self._io.read_u4be()
+            self.ofs_or_data = self._io.read_u4be()
+
+        @property
+        def type_byte_length(self):
+            if hasattr(self, '_m_type_byte_length'):
+                return self._m_type_byte_length if hasattr(self, '_m_type_byte_length') else None
+
+            self._m_type_byte_length = (2 if self.field_type == self._root.IfdField.FieldTypeEnum.word else (4 if self.field_type == self._root.IfdField.FieldTypeEnum.dword else 1))
+            return self._m_type_byte_length if hasattr(self, '_m_type_byte_length') else None
+
+        @property
+        def byte_length(self):
+            if hasattr(self, '_m_byte_length'):
+                return self._m_byte_length if hasattr(self, '_m_byte_length') else None
+
+            self._m_byte_length = (self.length * self.type_byte_length)
+            return self._m_byte_length if hasattr(self, '_m_byte_length') else None
+
+        @property
+        def is_immediate_data(self):
+            if hasattr(self, '_m_is_immediate_data'):
+                return self._m_is_immediate_data if hasattr(self, '_m_is_immediate_data') else None
+
+            self._m_is_immediate_data = self.byte_length <= 4
+            return self._m_is_immediate_data if hasattr(self, '_m_is_immediate_data') else None
+
+        @property
+        def data(self):
+            if hasattr(self, '_m_data'):
+                return self._m_data if hasattr(self, '_m_data') else None
+
+            if not self.is_immediate_data:
+                io = self._root._io
+                _pos = io.pos()
+                io.seek(self.ofs_or_data)
+                self._m_data = io.read_bytes(self.byte_length)
+                io.seek(_pos)
+
+            return self._m_data if hasattr(self, '_m_data') else None
+
+
+    @property
+    def ifd0(self):
+        if hasattr(self, '_m_ifd0'):
+            return self._m_ifd0 if hasattr(self, '_m_ifd0') else None
+
+        _pos = self._io.pos()
+        self._io.seek(self.ifd0_ofs)
+        self._m_ifd0 = self._root.Ifd(self._io, self, self._root)
+        self._io.seek(_pos)
+        return self._m_ifd0 if hasattr(self, '_m_ifd0') else None
+
+
diff --git a/mitmproxy/contrib/kaitaistruct/jpeg.py b/mitmproxy/contrib/kaitaistruct/jpeg.py
new file mode 100644
index 00000000..ca846a1e
--- /dev/null
+++ b/mitmproxy/contrib/kaitaistruct/jpeg.py
@@ -0,0 +1,191 @@
+# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+
+import array
+import struct
+import zlib
+from enum import Enum
+
+from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
+
+
+from .exif import Exif
+class Jpeg(KaitaiStruct):
+
+    class ComponentId(Enum):
+        y = 1
+        cb = 2
+        cr = 3
+        i = 4
+        q = 5
+    def __init__(self, _io, _parent=None, _root=None):
+        self._io = _io
+        self._parent = _parent
+        self._root = _root if _root else self
+        self.segments = []
+        while not self._io.is_eof():
+            self.segments.append(self._root.Segment(self._io, self, self._root))
+
+
+    class Segment(KaitaiStruct):
+
+        class MarkerEnum(Enum):
+            tem = 1
+            sof0 = 192
+            sof1 = 193
+            sof2 = 194
+            sof3 = 195
+            dht = 196
+            sof5 = 197
+            sof6 = 198
+            sof7 = 199
+            soi = 216
+            eoi = 217
+            sos = 218
+            dqt = 219
+            dnl = 220
+            dri = 221
+            app0 = 224
+            app1 = 225
+            app2 = 226
+            com = 254
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.magic = self._io.ensure_fixed_contents(struct.pack('1b', -1))
+            self.marker = self._root.Segment.MarkerEnum(self._io.read_u1())
+            if  ((self.marker != self._root.Segment.MarkerEnum.soi) and (self.marker != self._root.Segment.MarkerEnum.eoi)) :
+                self.length = self._io.read_u2be()
+
+            if  ((self.marker != self._root.Segment.MarkerEnum.soi) and (self.marker != self._root.Segment.MarkerEnum.eoi)) :
+                _on = self.marker
+                if _on == self._root.Segment.MarkerEnum.sos:
+                    self._raw_data = self._io.read_bytes((self.length - 2))
+                    io = KaitaiStream(BytesIO(self._raw_data))
+                    self.data = self._root.SegmentSos(io, self, self._root)
+                elif _on == self._root.Segment.MarkerEnum.app1:
+                    self._raw_data = self._io.read_bytes((self.length - 2))
+                    io = KaitaiStream(BytesIO(self._raw_data))
+                    self.data = self._root.SegmentApp1(io, self, self._root)
+                elif _on == self._root.Segment.MarkerEnum.sof0:
+                    self._raw_data = self._io.read_bytes((self.length - 2))
+                    io = KaitaiStream(BytesIO(self._raw_data))
+                    self.data = self._root.SegmentSof0(io, self, self._root)
+                elif _on == self._root.Segment.MarkerEnum.app0:
+                    self._raw_data = self._io.read_bytes((self.length - 2))
+                    io = KaitaiStream(BytesIO(self._raw_data))
+                    self.data = self._root.SegmentApp0(io, self, self._root)
+                else:
+                    self.data = self._io.read_bytes((self.length - 2))
+
+            if self.marker == self._root.Segment.MarkerEnum.sos:
+                self.image_data = self._io.read_bytes_full()
+
+
+
+    class SegmentSos(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.num_components = self._io.read_u1()
+            self.components = [None] * (self.num_components)
+            for i in range(self.num_components):
+                self.components[i] = self._root.SegmentSos.Component(self._io, self, self._root)
+
+            self.start_spectral_selection = self._io.read_u1()
+            self.end_spectral = self._io.read_u1()
+            self.appr_bit_pos = self._io.read_u1()
+
+        class Component(KaitaiStruct):
+            def __init__(self, _io, _parent=None, _root=None):
+                self._io = _io
+                self._parent = _parent
+                self._root = _root if _root else self
+                self.id = self._root.ComponentId(self._io.read_u1())
+                self.huffman_table = self._io.read_u1()
+
+
+
+    class SegmentApp1(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.magic = self._io.read_strz("ASCII", 0, False, True, True)
+            _on = self.magic
+            if _on == u"Exif":
+                self.body = self._root.ExifInJpeg(self._io, self, self._root)
+
+
+    class SegmentSof0(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.bits_per_sample = self._io.read_u1()
+            self.image_height = self._io.read_u2be()
+            self.image_width = self._io.read_u2be()
+            self.num_components = self._io.read_u1()
+            self.components = [None] * (self.num_components)
+            for i in range(self.num_components):
+                self.components[i] = self._root.SegmentSof0.Component(self._io, self, self._root)
+
+
+        class Component(KaitaiStruct):
+            def __init__(self, _io, _parent=None, _root=None):
+                self._io = _io
+                self._parent = _parent
+                self._root = _root if _root else self
+                self.id = self._root.ComponentId(self._io.read_u1())
+                self.sampling_factors = self._io.read_u1()
+                self.quantization_table_id = self._io.read_u1()
+
+            @property
+            def sampling_x(self):
+                if hasattr(self, '_m_sampling_x'):
+                    return self._m_sampling_x if hasattr(self, '_m_sampling_x') else None
+
+                self._m_sampling_x = ((self.sampling_factors & 240) >> 4)
+                return self._m_sampling_x if hasattr(self, '_m_sampling_x') else None
+
+            @property
+            def sampling_y(self):
+                if hasattr(self, '_m_sampling_y'):
+                    return self._m_sampling_y if hasattr(self, '_m_sampling_y') else None
+
+                self._m_sampling_y = (self.sampling_factors & 15)
+                return self._m_sampling_y if hasattr(self, '_m_sampling_y') else None
+
+
+
+    class ExifInJpeg(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.extra_zero = self._io.ensure_fixed_contents(struct.pack('1b', 0))
+            self._raw_data = self._io.read_bytes_full()
+            io = KaitaiStream(BytesIO(self._raw_data))
+            self.data = Exif(io)
+
+
+    class SegmentApp0(KaitaiStruct):
+
+        class DensityUnit(Enum):
+            no_units = 0
+            pixels_per_inch = 1
+            pixels_per_cm = 2
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.magic = self._io.read_str_byte_limit(5, "ASCII")
+            self.version_major = self._io.read_u1()
+            self.version_minor = self._io.read_u1()
+            self.density_units = self._root.SegmentApp0.DensityUnit(self._io.read_u1())
+            self.density_x = self._io.read_u2be()
+            self.density_y = self._io.read_u2be()
+            self.thumbnail_x = self._io.read_u1()
+            self.thumbnail_y = self._io.read_u1()
+            self.thumbnail = self._io.read_bytes(((self.thumbnail_x * self.thumbnail_y) * 3))