LengthDelimitedOutputManager takes --prefix_length to determine the size in bytes of the length prefix to output, but endianness is currently hard-coded. Additionally, the prefix length being read by LengthDelimitedFileMessageSource should be separately optioned from the prefix length written out. Hence --source_prefix_length should be an option for LengthDelimitedFileMessageSource and --output_prefix_length should be come an option instrumenting LengthDelimitedOutputManager.
LengthDelimitedOutputManagertakes--prefix_lengthto determine the size in bytes of the length prefix to output, but endianness is currently hard-coded. Additionally, the prefix length being read byLengthDelimitedFileMessageSourceshould be separately optioned from the prefix length written out. Hence--source_prefix_lengthshould be an option forLengthDelimitedFileMessageSourceand--output_prefix_lengthshould be come an option instrumentingLengthDelimitedOutputManager.