Allow getexif() to access TIFF tag_v2 data

Tests/test_file_tiff.py

@@ -389,6 +389,50 @@ def test_ifd_tag_type(self):
         with Image.open("Tests/images/ifd_tag_type.tiff") as im:
             assert 0x8825 in im.tag_v2
 
+    def test_exif(self):
+        with Image.open("Tests/images/ifd_tag_type.tiff") as im:
+            exif = im.getexif()
+
+            assert sorted(exif.keys()) == [
+                256,
+                257,
+                258,
+                259,
+                262,
+                271,
+                272,
+                273,
+                277,
+                278,
+                279,
+                282,
+                283,
+                284,
+                296,
+                297,
+                305,
+                339,
+                700,
+                34665,
+                34853,
+                50735,
+            ]
+            assert exif[256] == 640
+            assert exif[271] == "FLIR"
+
+            gps = exif.get_ifd(0x8825)
+            assert list(gps.keys()) == [0, 1, 2, 3, 4, 5, 6, 18]
+            assert gps[0] == b"\x03\x02\x00\x00"
+            assert gps[18] == "WGS-84"
+
+    def test_exif_frames(self):
+        # Test that EXIF data can change across frames
+        with Image.open("Tests/images/g4-multi.tiff") as im:
+            assert im.getexif()[273] == (328, 815)
+
+            im.seek(1)
+            assert im.getexif()[273] == (1408, 1907)
+
     def test_seek(self):
         filename = "Tests/images/pil136.tiff"
         with Image.open(filename) as im:

Tests/test_image.py

@@ -773,6 +773,27 @@ def test_exif_ifd(self):
         reloaded_exif.load(exif.tobytes())
         assert reloaded_exif.get_ifd(0x8769) == exif.get_ifd(0x8769)
 
+    def test_exif_load_from_fp(self):
+        with Image.open("Tests/images/flower.jpg") as im:
+            data = im.info["exif"]
+            if data.startswith(b"Exif\x00\x00"):
+                data = data[6:]
+            fp = io.BytesIO(data)
+
+            exif = Image.Exif()
+            exif.load_from_fp(fp)
+            assert exif == {
+                271: "Canon",
+                272: "Canon PowerShot S40",
+                274: 1,
+                282: 180.0,
+                283: 180.0,
+                296: 2,
+                306: "2003:12:14 12:01:44",
+                531: 1,
+                34665: 196,
+            }
+
     @pytest.mark.skipif(
         sys.version_info < (3, 7), reason="Python 3.7 or greater required"
     )

src/PIL/Image.py

@@ -1317,11 +1317,16 @@ def getexif(self):
             self._exif = Exif()
 
         exif_info = self.info.get("exif")
-        if exif_info is None and "Raw profile type exif" in self.info:
-            exif_info = bytes.fromhex(
-                "".join(self.info["Raw profile type exif"].split("\n")[3:])
-            )
-        self._exif.load(exif_info)
+        if exif_info is None:
+            if "Raw profile type exif" in self.info:
+                exif_info = bytes.fromhex(
+                    "".join(self.info["Raw profile type exif"].split("\n")[3:])
+                )
+            elif hasattr(self, "tag_v2"):
+                self._exif.endian = self.tag_v2._endian
+                self._exif.load_from_fp(self.fp, self.tag_v2._offset)
+        if exif_info is not None:
+            self._exif.load(exif_info)
 
         # XMP tags
         if 0x0112 not in self._exif:
@@ -3297,7 +3302,7 @@ def _apply_env_variables(env=None):
 
 
 class Exif(MutableMapping):
-    endian = "<"
+    endian = None
 
     def __init__(self):
         self._data = {}
@@ -3332,6 +3337,12 @@ def _get_ifd_dict(self, offset):
             info.load(self.fp)
             return self._fixup_dict(info)
 
+    def _get_head(self):
+        if self.endian == "<":
+            return b"II\x2A\x00\x08\x00\x00\x00"
+        else:
+            return b"MM\x00\x2A\x00\x00\x00\x08"
+
     def load(self, data):
         # Extract EXIF information.  This is highly experimental,
         # and is likely to be replaced with something better in a future
@@ -3344,8 +3355,8 @@ def load(self, data):
         self._loaded_exif = data
         self._data.clear()
         self._ifds.clear()
-        self._info = None
         if not data:
+            self._info = None
             return
 
         if data.startswith(b"Exif\x00\x00"):
@@ -3360,6 +3371,27 @@ def load(self, data):
         self.fp.seek(self._info.next)
         self._info.load(self.fp)
 
+    def load_from_fp(self, fp, offset=None):
+        self._loaded_exif = None
+        self._data.clear()
+        self._ifds.clear()
+
+        # process dictionary
+        from . import TiffImagePlugin
+
+        self.fp = fp
+        if offset is not None:
+            self.head = self._get_head()
+        else:
+            self.head = self.fp.read(8)
+        self._info = TiffImagePlugin.ImageFileDirectory_v2(self.head)
+        if self.endian is None:
+            self.endian = self._info._endian
+        if offset is None:
+            offset = self._info.next
+        self.fp.seek(offset)
+        self._info.load(self.fp)
+
     def _get_merged_dict(self):
         merged_dict = dict(self)
 
@@ -3378,10 +3410,7 @@ def _get_merged_dict(self):
     def tobytes(self, offset=8):
         from . import TiffImagePlugin
 
-        if self.endian == "<":
-            head = b"II\x2A\x00\x08\x00\x00\x00"
-        else:
-            head = b"MM\x00\x2A\x00\x00\x00\x08"
+        head = self._get_head()
         ifd = TiffImagePlugin.ImageFileDirectory_v2(ifh=head)
         for tag, value in self.items():
             if tag in [0x8769, 0x8225, 0x8825] and not isinstance(value, dict):