Decrease Dart binary size by 1.7MB

runtime/tools/create_resources.py

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # This python script creates string literals in a C++ source file from a C++
 # source template and one or more resource files.
 
 import os
 import sys
-from os.path import join
+from os.path import join, splitext
 import time
 from optparse import OptionParser
 import re
 from datetime import date
+import zlib
 
-def makeResources(root_dir, client_dir, input_files, table_name):
+def makeResources(root_dir, client_dir, input_files, table_name, compress, no_compress_extensions):
   result = ''
   resources = []
 
   # Write each file's contents as a byte string constant.
   for resource_file in input_files:
     if root_dir and resource_file.startswith(root_dir):
       resource_file_name = resource_file[ len(root_dir) : ]
     elif client_dir and resource_file.startswith(client_dir):
       resource_file_name = resource_file[ len(client_dir) : ]
     else:
       resource_file_name = resource_file
+    _, ext = os.path.splitext(resource_file)
+    if ext in no_compress_extensions:
+      # Force no compression for files of this extension.
+      compress = None
     resource_url = '/%s' % resource_file_name
     result += '// %s\n' % resource_file
     result += 'const char '
     resource_name = re.sub(r'(/|\.|-|\\)', '_', resource_file_name) + '_'
     result += resource_name
     result += '[] = {\n   '
     fileHandle = open(resource_file, 'rb')
     lineCounter = 0
-    for byte in fileHandle.read():
+    file_contents = fileHandle.read()
+    if compress:
+      file_contents = zlib.compress(file_contents)
+    for byte in file_contents:
       result += r" '\x%02x'," % ord(byte)
       lineCounter += 1
       if lineCounter == 10:
         result += '\n   '
         lineCounter = 0
     if lineCounter != 0:
       result += '\n   '
     result += ' 0\n};\n\n'
     resource_url_scrubbed = re.sub(r'\\', '/', resource_url)
     resources.append(
-        (resource_url_scrubbed, resource_name, os.stat(resource_file).st_size));
+        (resource_url_scrubbed, resource_name, len(file_contents)));
 
   # Write the resource table.
   result += 'ResourcesEntry __%s_resources_[] = ' % table_name
   result += '{\n'
   for res in resources:
     result += '   { "%s", %s, %d },\n' % res
   result += '   { 0, 0, 0 },\n'
   result += '};\n\n'
   return result
 
 
 def makeFile(output_file, root_dir, client_dir, input_files, outer_namespace,
-             inner_namespace, table_name):
+             inner_namespace, table_name, compress, no_compress_extensions):
   cc_text = '''
 // Copyright (c) %d, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 ''' % date.today().year
   cc_text += 'namespace %s {\n' % outer_namespace
   if inner_namespace != None:
     cc_text += 'namespace %s {\n' % inner_namespace
   cc_text += '''
 struct ResourcesEntry {
   const char* path_;
   const char* resource_;
   int length_;
 };
 
 '''
-  cc_text += makeResources(root_dir, client_dir, input_files, table_name)
+  cc_text += makeResources(root_dir, client_dir, input_files, table_name,
+                           compress, no_compress_extensions)
   cc_text += '\n'
   if inner_namespace != None:
     cc_text += '}  // namespace %s\n' % inner_namespace
   cc_text += '} // namespace %s\n' % outer_namespace
   open(output_file, 'w').write(cc_text)
   return True
 
 
 def main(args):
   try:
@@ skipping 11 matching lines @@
                       default="dart")
     parser.add_option("--inner_namespace",
                       action="store", type="string",
                       help="inner C++ namespace")
     parser.add_option("--table_name",
                       action="store", type="string",
                       help="name of table")
     parser.add_option("--client_root",
                       action="store", type="string",
                       help="root directory client resources")
+    parser.add_option("--compress",
+                      action="store_true",
+                      help="zlib compress resources")
+    parser.add_option("--no_compress_extensions",
+                      action="append",
+                      default=['.dart'],
+                      help="file extensions that should not be compressed.")
+
     (options, args) = parser.parse_args()
     if not options.output:
       sys.stderr.write('--output not specified\n')
       return -1
     if not options.table_name:
       sys.stderr.write('--table_name not specified\n')
       return -1
     if len(args) == 0:
       sys.stderr.write('No input files specified\n')
       return -1
@@ skipping 12 matching lines @@
           # Skip devtools version
           if (src_path.find("index_devtools") != -1):
               continue
           files.append(src_path)
 
     for arg in args:
       files.append(arg)
 
     if not makeFile(options.output, options.root_prefix, options.client_root,
                     files, options.outer_namespace, options.inner_namespace,
-                    options.table_name):
+                    options.table_name, options.compress,
+                    options.no_compress_extensions):
       return -1
 
     return 0
   except Exception, inst:
     sys.stderr.write('create_resources.py exception\n')
     sys.stderr.write(str(inst))
     sys.stderr.write('\n')
     return -1
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))