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2022-01-20reftable: make reftable_record a tagged unionLibravatar Han-Wen Nienhuys1-2/+2
This reduces the amount of glue code, because we don't need a void pointer or vtable within the structure. The only snag is that reftable_index_record contain a strbuf, so it cannot be zero-initialized. To address this, use reftable_new_record() to return fresh instance, given a record type. Since reftable_new_record() doesn't cause heap allocation anymore, it should be balanced with reftable_record_release() rather than reftable_record_destroy(). Thanks to Peff for the suggestion. Helped-by: Jeff King <peff@peff.net> Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-08reftable: read reftable filesLibravatar Han-Wen Nienhuys1-0/+194
This supports reading a single reftable file. The commit introduces an abstract iterator type, which captures the usecases both of reading individual refs, and iterating over a segment of the ref namespace. Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>