Kindle driver: Upload cover thumbnails when sending books to device by USB to workaround Amazon bug of not displaying covers for sync-enabled books

src/calibre/devices/kindle/driver.py

@@ -13,6 +13,7 @@ import datetime, os, re, sys, json, hashlib
 from calibre.devices.kindle.bookmark import Bookmark
 from calibre.devices.usbms.driver import USBMS
 from calibre import strftime
+from calibre.utils.logging import default_log
 
 '''
 Notes on collections:
@@ -324,6 +325,7 @@ class KINDLE2(KINDLE):
     OPT_APNX           = 0
     OPT_APNX_ACCURATE  = 1
     OPT_APNX_CUST_COL  = 2
+    THUMBNAIL_HEIGHT = 180
 
     def formats_to_scan_for(self):
         ans = USBMS.formats_to_scan_for(self) | {'azw3'}
@@ -375,8 +377,36 @@ class KINDLE2(KINDLE):
 
     def upload_cover(self, path, filename, metadata, filepath):
         '''
-        Hijacking this function to write the apnx file.
+        Upload sidecar files: cover thumbnails and page count
         '''
+        # Upload the cover thumbnail
+        try:
+            self.upload_kindle_thumbnail(metadata, filepath)
+        except:
+            import traceback
+            traceback.print_exc()
+        # Upload the apnx file
+        self.upload_apnx(filename, metadata, filepath)
+
+    def upload_kindle_thumbnail(self, metadata, filepath):
+        coverdata = getattr(metadata, 'thumbnail', None)
+        if not coverdata or not coverdata[2]:
+            return
+        thumb_dir = os.path.join(self._main_prefix, 'system', 'thumbnails')
+        if not os.path.exists(thumb_dir): return
+
+        from calibre.ebooks.mobi.reader.headers import MetadataHeader
+        with lopen(filepath, 'rb') as f:
+            mh = MetadataHeader(f, default_log)
+        if mh.exth is None or not mh.exth.uuid or not mh.exth.cdetype:
+            return
+        thumbfile = os.path.join(thumb_dir,
+                'thumbnail_{uuid}_{cdetype}_portrait.jpg'.format(
+                    uuid=mh.exth.uuid, cdetype=mh.exth.cdetype))
+        with open(thumbfile, 'wb') as f:
+            f.write(coverdata[2])
+
+    def upload_apnx(self, filename, metadata, filepath):
         from calibre.devices.kindle.apnx import APNXBuilder
 
         opts = self.settings()
@@ -422,6 +452,9 @@ class KINDLE_DX(KINDLE2):
     PRODUCT_ID = [0x0003]
     BCD        = [0x0100]
 
+    def upload_kindle_thumbnail(self, metadata, filepath):
+        pass
+
 class KINDLE_FIRE(KINDLE2):
 
     name = 'Kindle Fire Device Interface'
@@ -440,4 +473,6 @@ class KINDLE_FIRE(KINDLE2):
     VENDOR_NAME = 'AMAZON'
     WINDOWS_MAIN_MEM = 'KINDLE'
 
+    def upload_kindle_thumbnail(self, metadata, filepath):
+        pass
 

src/calibre/ebooks/mobi/reader/headers.py

@@ -45,6 +45,10 @@ class EXTHHeader(object): # {{{
             elif idx == 202:
                 self.thumbnail_offset, = struct.unpack('>L', content)
             elif idx == 501:
+                try:
+                    self.cdetype = content.decode('ascii')
+                except UnicodeDecodeError:
+                    self.cdetype = None
                 # cdetype
                 if content == b'EBSP':
                     if not self.mi.tags:
@@ -109,8 +113,11 @@ class EXTHHeader(object): # {{{
                         self.mi.isbn = raw
             except:
                 pass
-        elif idx == 113:
-            pass # ASIN or UUID
+        elif idx == 113: # ASIN or other id
+            try:
+                self.uuid = content.decode('ascii')
+            except:
+                self.uuid = None
         elif idx == 116:
             self.start_offset, = struct.unpack(b'>L', content)
         elif idx == 121: