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2022-01-20reftable: make reftable_record a tagged unionLibravatar Han-Wen Nienhuys1-11/+11
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: reading/writing blocksLibravatar Han-Wen Nienhuys1-0/+120
The reftable format is structured as a sequence of block. Within a block, records are prefix compressed, with an index of offsets for fully expand keys to enable binary search within blocks. This commit provides the logic to read and write these blocks. Helped-by: Carlo Marcelo Arenas Belón <carenas@gmail.com> Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>