Ensure fragment pointers passed to cleanup

This patch achieves a couple of things as follows:

- Undoing the liberasurecode_encode_cleanup specification to
  expect "fragment" pointers as its arguments.

- Ensuring liberasurecode_encode to pass "fratment" pointers to
  liberasurecode_encode_cleanup.

liberasurecode_encode_cleanup is used also in pyeclib so that
it is expected that the argument pointers (i.e. encoded_data and
encoded_parity) should be the collection of the heads of "fragment"
pointers.

However, when the backend encode fails, liberasurecode keeps "data"
pointers behind of fragment_header, and then, goes to "out:" statement
to cleanup its memories. It causes invalid pointer failure.

This patch adds a translation function from "data" pointers to "fragment"
pointers and ensure liberasurecode_encode to pass correct pointers to
libersurecode_encode_cleanup.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/erasurecode/erasurecode_helpers.h b/include/erasurecode/erasurecode_helpers.h
index 93a8b6f..9c4e50d 100644
--- a/include/erasurecode/erasurecode_helpers.h
+++ b/include/erasurecode/erasurecode_helpers.h
@@ -126,6 +126,8 @@ int get_aligned_data_size(ec_backend_t instance, int data_len);
 char *get_data_ptr_from_fragment(char *buf);
 int get_data_ptr_array_from_fragments(char **data_array, char **fragments,
         int num_fragments);
+int get_fragment_ptr_array_from_data(char **frag_array, char **data,
+        int num_data);
 char *get_fragment_ptr_from_data_novalidate(char *buf);
 char *get_fragment_ptr_from_data(char *buf);
 uint64_t get_fragment_size(char *buf);