SF python#75103: imghdr -- identify JPEGs in EXIF format

Author: rhettinger

Doc/lib/libimghdr.tex

@@ -31,11 +31,13 @@ \section{\module{imghdr} ---
   \lineii{'tiff'}{TIFF Files}
   \lineii{'rast'}{Sun Raster Files}
   \lineii{'xbm'}{X Bitmap Files}
-  \lineii{'jpeg'}{JPEG data in JFIF format}
+  \lineii{'jpeg'}{JPEG data in JFIF or Exif formats}
   \lineii{'bmp'}{BMP files}
   \lineii{'png'}{Portable Network Graphics}
 \end{tableii}
 
+\versionadded[Exif detection]{2.5}
+
 You can extend the list of file types \module{imghdr} can recognize by
 appending to this variable:
 

Lib/imghdr.py

@@ -101,6 +101,13 @@ def test_jpeg(h, f):
 
 tests.append(test_jpeg)
 
+def test_exif(h, f):
+    """JPEG data in Exif format"""
+    if h[6:10] == 'Exif':
+        return 'jpeg'
+
+tests.append(test_exif)
+
 def test_bmp(h, f):
     if h[:2] == 'BM':
         return 'bmp'

Misc/NEWS

@@ -33,6 +33,8 @@ Extension Modules
 Library
 -------
 
+- The imghdr module now detects Exif files.
+
 - StringIO.truncate() now correctly adjusts the size attribute.
   (Bug #951915).