tree 85b1e59b2f4e88d6dd6c4dbb379d34749988a858
parent 7946a5fd25edd32027141d512031f96e94ff8fbd
author Johan Corveleyn <jcorvel@apache.org> 1290989168 +0000
committer Johan Corveleyn <jcorvel@apache.org> 1290989168 +0000

On the diff-optimizations-tokens branch:

Add skeleton implementation of suffix scanning.

Getting tokens backwards (datasource_get_previous_token), and pushing back
suffix tokens (token_pushback_suffix), are still stub implementations, which
will be added in a follow up commit.

* subversion/include/svn_diff.h
  (svn_diff_fns_t): Add new function types datasource_get_previous_token and
   token_pushback_suffix. Add parameter open_at_end to datasource_open.

* subversion/libsvn_diff/diff_file.c
  (datasource_get_previous_token): New function, stub implementation.
  (token_pushback_suffix): New function, stub implementation.
  (datasource_open): Add parameter open_at_end. Add implementation to open the
   datasource at the end (read last chunk, point curp to the last byte). Make
   sure the actual file is only opened if hasn't been opened yet, so this
   function can be reused to jump to the end or the beginning of the file
   at will. While we are at it, remove local variables curp and endp, since
   they aren't needed anymore.

* subversion/libsvn_diff/diff_memory.c
  (datasource_get_previous_token): New function, stub implementation.
  (token_pushback_suffix): New function, stub implementation.
  (datasource_open): Add parameter open_at_end.

* subversion/libsvn_diff/token.c
  (svn_diff__get_tokens): Pass FALSE for parameter open_at_end to
   datasource_open, for backwards compatibility.
  (find_identical_suffix): New function.
  (find_identical_prefix): Remove parameter reached_one_eof, and convert it to
   a local variable, since it doesn't need to be returned anymore.
  (svn_diff__get_all_tokens): Add call to find_identical_suffix, before
   calling find_identical_prefix, and call datasource_open in between to
   reposition the datasource at the end and the start respectively.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/diff-optimizations-tokens@1039986 13f79535-47bb-0310-9956-ffa450edef68