[PATCH 10 of 11] hgweb: use compression engine API for zlib compression

[Gregory Szorc]

# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1477160356 25200
#      Sat Oct 22 11:19:16 2016 -0700
# Node ID fc426af4f25c3403703e913ccb4a6865865fcb02
# Parent  03555032b7e3bc7192fd8bebf6af3f05b1e70516
hgweb: use compression engine API for zlib compression

More low-level compression code elimination because we now have nice
APIs.

diff --git a/mercurial/hgweb/protocol.py b/mercurial/hgweb/protocol.py
--- a/mercurial/hgweb/protocol.py
+++ b/mercurial/hgweb/protocol.py
@@ -83,24 +83,18 @@ class webproto(wireproto.abstractserverp
                 yield chunk
 
         return self.compresschunks(getchunks())
 
     def compresschunks(self, chunks):
         # Don't allow untrusted settings because disabling compression or
         # setting a very high compression level could lead to flooding
         # the server's network or CPU.
-        z = zlib.compressobj(self.ui.configint('server', 'zliblevel', -1))
-        for chunk in chunks:
-            data = z.compress(chunk)
-            # Not all calls to compress() emit data. It is cheaper to inspect
-            # that here than to send it via the generator.
-            if data:
-                yield data
-        yield z.flush()
+        opts = {'level': self.ui.configint('server', 'zliblevel', -1)}
+        return util.compressionengines['zlib'].compressstream(chunks, opts)
 
     def _client(self):
         return 'remote:%s:%s:%s' % (
             self.req.env.get('wsgi.url_scheme') or 'http',
             urlreq.quote(self.req.env.get('REMOTE_HOST', '')),
             urlreq.quote(self.req.env.get('REMOTE_USER', '')))
 
 def iscmd(cmd):