refactor string memory initializer into tools/shared.py

emcc

@@ -1355,29 +1355,7 @@ try:
       if not membytes: return ''
       if not memory_init_file:
         # memory initializer in a string literal
-        s = list(membytes)
-        if shared.Settings.ASSERTIONS:
-          # append checksum of length and content
-          crcTable = []
-          for i in range(256):
-            crc = i
-            for bit in range(8):
-              crc = (crc >> 1) ^ ((crc & 1) * 0xedb88320)
-            crcTable.append(crc)
-          crc = 0xffffffff
-          n = len(s)
-          crc = crcTable[(crc ^ n) & 0xff] ^ (crc >> 8)
-          crc = crcTable[(crc ^ (n >> 8)) & 0xff] ^ (crc >> 8)
-          for i in s:
-            crc = crcTable[(crc ^ i) & 0xff] ^ (crc >> 8)
-          for i in range(4):
-            s.append((crc >> (8 * i)) & 0xff)
-        s = ''.join(map(chr, s))
-        s = s.replace('\\', '\\\\').replace("'", "\\'")
-        s = s.replace('\n', '\\n').replace('\r', '\\r')
-        def escape(x): return '\\x{:02x}'.format(ord(x.group()))
-        s = re.sub('[\x80-\xff]', escape, s)
-        return "memoryInitializer = '%s';" % s
+        return "memoryInitializer = '%s';" % shared.JS.generate_string_initializer(list(membytes))
       open(memfile, 'wb').write(''.join(map(chr, membytes)))
       if DEBUG:
         # Copy into temp dir as well, so can be run there too

tools/shared.py

@@ -1810,6 +1810,30 @@ class JS:
     if len(contents) <= JS.INITIALIZER_CHUNK_SIZE: return None
     return JS.replace_initializers(src, JS.split_initializer(contents))
 
+  @staticmethod
+  def generate_string_initializer(s):
+    if Settings.ASSERTIONS:
+      # append checksum of length and content
+      crcTable = []
+      for i in range(256):
+        crc = i
+        for bit in range(8):
+          crc = (crc >> 1) ^ ((crc & 1) * 0xedb88320)
+        crcTable.append(crc)
+      crc = 0xffffffff
+      n = len(s)
+      crc = crcTable[(crc ^ n) & 0xff] ^ (crc >> 8)
+      crc = crcTable[(crc ^ (n >> 8)) & 0xff] ^ (crc >> 8)
+      for i in s:
+        crc = crcTable[(crc ^ i) & 0xff] ^ (crc >> 8)
+      for i in range(4):
+        s.append((crc >> (8 * i)) & 0xff)
+    s = ''.join(map(chr, s))
+    s = s.replace('\\', '\\\\').replace("'", "\\'")
+    s = s.replace('\n', '\\n').replace('\r', '\\r')
+    def escape(x): return '\\x{:02x}'.format(ord(x.group()))
+    return re.sub('[\x80-\xff]', escape, s)
+
 # Compression of code and data for smaller downloads
 class Compression:
   on = False