reftable/iter.h

   1 /*
   2 Copyright 2020 Google LLC
   3
   4 Use of this source code is governed by a BSD-style
   5 license that can be found in the LICENSE file or at
   6 https://developers.google.com/open-source/licenses/bsd
   7 */
   8
   9 #ifndef ITER_H
  10 #define ITER_H
  11
  12 #include "system.h"
  13 #include "block.h"
  14 #include "record.h"
  15
  16 #include "reftable-iterator.h"
  17 #include "reftable-generic.h"
  18
  19 /* iterator that produces only ref records that point to `oid` */
  20 struct filtering_ref_iterator {
  21         int double_check;
  22         struct reftable_table tab;
  23         struct strbuf oid;
  24         struct reftable_iterator it;
  25 };
  26 #define FILTERING_REF_ITERATOR_INIT \
  27         {                           \
  28                 .oid = STRBUF_INIT  \
  29         }
  30
  31 void iterator_from_filtering_ref_iterator(struct reftable_iterator *,
  32                                           struct filtering_ref_iterator *);
  33
  34 /* iterator that produces only ref records that point to `oid`,
  35  * but using the object index.
  36  */
  37 struct indexed_table_ref_iter {
  38         struct reftable_reader *r;
  39         struct strbuf oid;
  40
  41         /* mutable */
  42         uint64_t *offsets;
  43
  44         /* Points to the next offset to read. */
  45         int offset_idx;
  46         int offset_len;
  47         struct block_reader block_reader;
  48         struct block_iter cur;
  49         int is_finished;
  50 };
  51
  52 #define INDEXED_TABLE_REF_ITER_INIT { \
  53         .cur = BLOCK_ITER_INIT, \
  54         .oid = STRBUF_INIT, \
  55 }
  56
  57 void iterator_from_indexed_table_ref_iter(struct reftable_iterator *it,
  58                                           struct indexed_table_ref_iter *itr);
  59
  60 /* Takes ownership of `offsets` */
  61 int new_indexed_table_ref_iter(struct indexed_table_ref_iter **dest,
  62                                struct reftable_reader *r, uint8_t *oid,
  63                                int oid_len, uint64_t *offsets, int offset_len);
  64
  65 #endif