[los-cocos] r1351 committed - support gzip compression in .TMX maps, #185, thanks fred@reichbier.de ...

[los-...@googlecode.com]

Revision: 1351
Author: ccanepacc
Date: Thu Mar 20 18:23:25 2014 UTC
Log: support gzip compression in .TMX maps, #185, thanks
fr...@reichbier.de for suggestion
http://code.google.com/p/los-cocos/source/detail?r=1351

Modified:
/trunk/cocos/tiles.py

=======================================
--- /trunk/cocos/tiles.py Wed Mar 19 14:11:44 2014 UTC
+++ /trunk/cocos/tiles.py Thu Mar 20 18:23:25 2014 UTC
@@ -239,8 +239,25 @@
import base64
b = s.encode('utf-8')
return base64.b64decode(b)
-
-
+
+def decompress_zlib(in_bytes):
+ """decompress the input array of bytes to an array of bytes using
zlib"""
+ if six.PY2:
+ out_bytes = in_bytes.decode('zlib')
+ else:
+ import zlib
+ out_bytes = zlib.decompress(in_bytes)
+ return out_bytes
+
+def decompress_gzip(in_bytes):
+ """decompress the input array of bytes to an array of bytes using
gzip"""
+ import gzip
+ inp = six.BytesIO(in_bytes)
+ f = gzip.GzipFile(fileobj=inp)
+ out_bytes = f.read()
+ f.close()
+ inp.close()
+ return out_bytes

def load_tmx(filename):
'''Load some tile mapping resources from a TMX file.
@@ -303,13 +320,17 @@
if data is None:
raise ValueError('layer %s does not contain <data>' %
layer.name)

+ compression = data.attrib.get('compression')
data = data.text.strip()
data = decode_base64(data)
- if six.PY2:
- data = data.decode('zlib')
- else:
- import zlib
- data = zlib.decompress(data)
+ if compression is not None:
+ if compression == 'zlib':
+ data = decompress_zlib(data)
+ elif compression == 'gzip':
+ data = decompress_gzip(data)
+ else:
+ raise ResourceError('Unknown compression method: %r' %
compression)
+
data = struct.unpack(str('<%di' % (len(data)//4)), data)
assert len(data) == width * height