MTP driver: Handle long filenames when adding files from device to calibre on windows

src/calibre/devices/mtp/driver.py

@@ -17,6 +17,7 @@
 from calibre.ptempfile import SpooledTemporaryFile, PersistentTemporaryDirectory
 from calibre.utils.config import from_json, to_json, JSONConfig
 from calibre.utils.date import now, isoformat, utcnow
+from calibre.utils.filenames import shorten_components_to
 
 BASE = importlib.import_module('calibre.devices.mtp.%s.driver'%(
     'windows' if iswindows else 'unix')).MTP_DEVICE
@@ -264,7 +265,11 @@ def prepare_addable_books(self, paths):
                 continue
             base = os.path.join(tdir, '%s'%f.object_id)
             os.mkdir(base)
-            with open(os.path.join(base, f.name), 'wb') as out:
+            name = f.name
+            if iswindows:
+                plen = len(base)
+                name = ''.join(shorten_components_to(245-plen, [name]))
+            with open(os.path.join(base, name), 'wb') as out:
                 try:
                     self.get_mtp_file(f, out)
                 except Exception as e:

src/calibre/devices/mtp/unix/driver.py

@@ -297,14 +297,16 @@ def put_file(self, parent, name, stream, size, callback=None, replace=True):
     def get_mtp_file(self, f, stream=None, callback=None):
         if f.is_folder:
             raise ValueError('%s if a folder'%(f.full_path,))
+        set_name = stream is None
         if stream is None:
             stream = SpooledTemporaryFile(5*1024*1024, '_wpd_receive_file.dat')
-            stream.name = f.name
         ok, errs = self.dev.get_file(f.object_id, stream, callback)
         if not ok:
             raise DeviceError('Failed to get file: %s with errors: %s'%(
                 f.full_path, self.format_errorstack(errs)))
         stream.seek(0)
+        if set_name:
+            stream.name = f.name
         return stream
 
     @synchronous

src/calibre/devices/mtp/windows/driver.py

@@ -321,9 +321,9 @@ def free_space(self, end_session=True):
     def get_mtp_file(self, f, stream=None, callback=None):
         if f.is_folder:
             raise ValueError('%s if a folder'%(f.full_path,))
+        set_name = stream is None
         if stream is None:
             stream = SpooledTemporaryFile(5*1024*1024, '_wpd_receive_file.dat')
-            stream.name = f.name
         try:
             try:
                 self.dev.get_file(f.object_id, stream, callback)
@@ -334,6 +334,8 @@ def get_mtp_file(self, f, stream=None, callback=None):
             raise DeviceError('Failed to fetch the file %s with error: %s'%
                     f.full_path, as_unicode(e))
         stream.seek(0)
+        if set_name:
+            stream.name = f.name
         return stream
 
     @same_thread