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reftable/table: introduce iterator for table blocks

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Introduce a new iterator that allows the caller to iterate through all
blocks contained in a table. This gives users more fine-grained control
over how exactly those blocks are being read and exposes information to
callers that was previously inaccessible.

This iterator will be required by a future patch series that adds
consistency checks for the reftable backend. In addition to that though
we will also reimplement `reftable_table_print_blocks()` on top of this
new iterator in a subsequent commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-04-07 15:16:26 +02:00
committed by Junio C Hamano
parent c8cbe85a23
commit da89659365
3 changed files with 173 additions and 0 deletions
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16
reftable/reftable-table.h
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@@ -10,6 +10,7 @@
#define REFTABLE_TABLE_H
#include "reftable-iterator.h"
#include "reftable-block.h"
#include "reftable-blocksource.h"
/*
@@ -99,4 +100,19 @@ uint64_t reftable_table_min_update_index(struct reftable_table *t);
/* print blocks onto stdout for debugging. */
int reftable_table_print_blocks(const char *tablename);
/*
* An iterator that iterates through the blocks contained in a given table.
*/
struct reftable_table_iterator {
void *iter_arg;
};
int reftable_table_iterator_init(struct reftable_table_iterator *it,
struct reftable_table *t);
void reftable_table_iterator_release(struct reftable_table_iterator *it);
int reftable_table_iterator_next(struct reftable_table_iterator *it,
const struct reftable_block **out);
#endif