Make the dump stream parser more resilient to malformed dump streams thatdo not contain \n characters at all.Previously, we'd attempt to load the whole input into memory due to howsvn_stream_readline() is currently implemented. Doing so could potentiallychoke for large files. The corresponding real-world case is where a user(accidentally) attempts to load a huge binary file that does not contain \ncharacters as the repository dump.This is the potential cause of the OOM reported in https://lists.apache.org/thread.html/c96eb5618ac0bf6e083345e0fdcdcf834e30913f26eabe6ada7bab62@%3Cusers.subversion.apache.org%3E* subversion/libsvn_repos/load.c (parse_format_version): Read the dump version string directly from stream, with an upper limit of 80 bytes. Comment on why we don't use svn_stream_readline() for this particular case. (svn_repos_parse_dumpstream3): Update the call to parse_format_version().