Create mobi-meta command line tool and make cover extraction from MOBI files more efficient

src/calibre/ebooks/metadata/mobi.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env  python
+__license__   = 'GPL v3'
+__copyright__ = '2009, Kovid Goyal kovid@kovidgoyal.net'
+__docformat__ = 'restructuredtext en'
+
+'''
+'''
+
+import sys, os
+
+from calibre.ebooks.mobi.reader import get_metadata
+
+def main(args=sys.argv):
+    if len(args) != 2:
+        print >>sys.stderr, 'Usage: %s file.mobi' % args[0]
+        return 1
+    fname = args[1]
+    mi = get_metadata(open(fname, 'rb'))
+    print unicode(mi)
+    if mi.cover_data[1]:
+        cover = os.path.abspath(
+            '.'.join((os.path.splitext(os.path.basename(fname))[0],
+                      mi.cover_data[0].lower())))
+        open(cover, 'wb').write(mi.cover_data[1])
+        print _('Cover saved to'), cover
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())

src/calibre/ebooks/mobi/reader.py

@@ -311,7 +311,7 @@ class MobiReader(object):
             opf.cover = 'images/%05d.jpg'%(self.book_header.exth.cover_offset+1)
         manifest = [(htmlfile, 'text/x-oeb1-document')]
         bp = os.path.dirname(htmlfile)
-        for i in self.image_names:
+        for i in getattr(self, 'image_names', []):
             manifest.append((os.path.join(bp, 'images/', i), 'image/jpg'))
         
         opf.create_manifest(manifest)
@@ -451,7 +451,7 @@ class MobiReader(object):
             image_index += 1
             try:
                 im = PILImage.open(buf)                
-            except IOError, e:
+            except IOError:
                 continue
              
             path = os.path.join(output_dir, '%05d.jpg'%image_index)
@@ -476,31 +476,23 @@ def get_metadata(stream):
     if mr.book_header.exth is None:
         mi = MetaInformation(mr.name, [_('Unknown')])
     else:
-        tdir = tempfile.mkdtemp('_mobi_meta', __appname__+'_')
-        atexit.register(shutil.rmtree, tdir)
-        #print tdir
-        mr.extract_images([], tdir)
         mi = mr.create_opf('dummy.html')
-        if mi.cover:
+        try:
-            cover =  os.path.join(tdir, mi.cover)
+            if hasattr(mr.book_header.exth, 'cover_offset'):
-            if not os.access(cover, os.R_OK):
+                cover_index = mr.book_header.first_image_index + mr.book_header.exth.cover_offset
-                fname = os.path.basename(cover)
+                data  = mr.sections[cover_index][0]
-                match = re.match(r'(\d+)(.+)', fname)
+            else:
-                if match:
+                data  = mr.sections[mr.book_header.first_image_index][0]
-                    num, ext = int(match.group(1), 10), match.group(2)
+            buf = cStringIO.StringIO(data)
-                    while num > 0:
+            im = PILImage.open(buf)
-                        num -= 1
+            obuf = cStringIO.StringIO()
-                        candidate = os.path.join(os.path.dirname(cover), '%05d%s'%(num, ext))
+            im.convert('RGBA').save(obuf, format='JPEG')
-                        if os.access(candidate, os.R_OK):
+            mi.cover_data = ('jpg', obuf.getvalue())
-                            cover = candidate
+        except:
-                            break
+            import traceback
-            if os.access(cover, os.R_OK):
+            traceback.print_exc()
-                mi.cover_data = ('JPEG', open(os.path.join(tdir, cover), 'rb').read())
+        return mi
-        else:
+        
-            path = os.path.join(tdir, 'images', '00001.jpg')
-            if os.access(path, os.R_OK):
-                mi.cover_data = ('JPEG', open(path, 'rb').read())
-    return mi
         
 def option_parser():
     from calibre.utils.config import OptionParser

src/calibre/linux.py

@@ -26,6 +26,7 @@ entry_points = {
                              'opf-meta  = calibre.ebooks.metadata.opf2:main',
                              'odt-meta  = calibre.ebooks.metadata.odt:main',
                              'epub-meta = calibre.ebooks.metadata.epub:main',
+                             'mobi-meta = calibre.ebooks.metadata.mobi:main',
                              'txt2lrf   = calibre.ebooks.lrf.txt.convert_from:main',
                              'html2lrf  = calibre.ebooks.lrf.html.convert_from:main',
                              'html2oeb  = calibre.ebooks.html:main',
@@ -423,7 +424,7 @@ def install_man_pages(fatal_errors):
         if prog in ('prs500', 'pdf-meta', 'epub-meta', 'lit-meta',
                     'markdown-calibre', 'calibre-debug', 'fb2-meta',
                     'calibre-fontconfig', 'calibre-parallel', 'odt-meta',
-                    'rb-meta', 'imp-meta'):
+                    'rb-meta', 'imp-meta', 'mobi-meta'):
             continue
 
         help2man = ('help2man', prog, '--name', 'part of %s'%__appname__,