revlog: generate trivial deltas against null revision To avoid extra memory usage and performance issues with large files, generate a trivial delta header for deltas against the null revision rather than calling the usual delta generator. We append the delta header to meta rather than prepending it to data to avoid a large allocate and copy.

changeset:   0:61c9426e69fe
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     test

---- HEADERS
200 Script output follows
---- DATA
[('content-type', 'text/html; charset=ascii')]
---- ERRORS