Bo Chen wrote on Sat, Apr 06, 2013 at 14:33:31 -0400: > Basically, what I want to do here is to retrieve a certain file from any > two revisions (directly from the repository), and compute the delta between > these two file versions. So I need to know first how can I retrieve a > certain file from any revision of the repository (what functions I can use > in the current code base? etc.), and how to compute the delta (I may > directly use the functions in \libsvn_delta\txdelta.c). Do you have any > suggestion for me?
I think your answer might not be high-level enough. That said, if you want to compute the delta between two versions, it'll be easiest to just do what 'svn update' does. svn_ra_do_update2() or svn_repos_dir_delta2() (but see comments in its doc string) might be good places to start. Or you could 'svn cat' twice and then pass the result to an svn_delta.h function.
