diff options
Diffstat (limited to 'reftable/iter.c')
| -rw-r--r-- | reftable/iter.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/reftable/iter.c b/reftable/iter.c new file mode 100644 index 0000000000..a8d174c040 --- /dev/null +++ b/reftable/iter.c @@ -0,0 +1,194 @@ +/* +Copyright 2020 Google LLC + +Use of this source code is governed by a BSD-style +license that can be found in the LICENSE file or at +https://developers.google.com/open-source/licenses/bsd +*/ + +#include "iter.h" + +#include "system.h" + +#include "block.h" +#include "generic.h" +#include "constants.h" +#include "reader.h" +#include "reftable-error.h" + +int iterator_is_null(struct reftable_iterator *it) +{ + return !it->ops; +} + +static void filtering_ref_iterator_close(void *iter_arg) +{ + struct filtering_ref_iterator *fri = iter_arg; + strbuf_release(&fri->oid); + reftable_iterator_destroy(&fri->it); +} + +static int filtering_ref_iterator_next(void *iter_arg, + struct reftable_record *rec) +{ + struct filtering_ref_iterator *fri = iter_arg; + struct reftable_ref_record *ref = &rec->u.ref; + int err = 0; + while (1) { + err = reftable_iterator_next_ref(&fri->it, ref); + if (err != 0) { + break; + } + + if (fri->double_check) { + struct reftable_iterator it = { NULL }; + + err = reftable_table_seek_ref(&fri->tab, &it, + ref->refname); + if (err == 0) { + err = reftable_iterator_next_ref(&it, ref); + } + + reftable_iterator_destroy(&it); + + if (err < 0) { + break; + } + + if (err > 0) { + continue; + } + } + + if (ref->value_type == REFTABLE_REF_VAL2 && + (!memcmp(fri->oid.buf, ref->value.val2.target_value, + fri->oid.len) || + !memcmp(fri->oid.buf, ref->value.val2.value, + fri->oid.len))) + return 0; + + if (ref->value_type == REFTABLE_REF_VAL1 && + !memcmp(fri->oid.buf, ref->value.val1, fri->oid.len)) { + return 0; + } + } + + reftable_ref_record_release(ref); + return err; +} + +static struct reftable_iterator_vtable filtering_ref_iterator_vtable = { + .next = &filtering_ref_iterator_next, + .close = &filtering_ref_iterator_close, +}; + +void iterator_from_filtering_ref_iterator(struct reftable_iterator *it, + struct filtering_ref_iterator *fri) +{ + assert(!it->ops); + it->iter_arg = fri; + it->ops = &filtering_ref_iterator_vtable; +} + +static void indexed_table_ref_iter_close(void *p) +{ + struct indexed_table_ref_iter *it = p; + block_iter_close(&it->cur); + reftable_block_done(&it->block_reader.block); + reftable_free(it->offsets); + strbuf_release(&it->oid); +} + +static int indexed_table_ref_iter_next_block(struct indexed_table_ref_iter *it) +{ + uint64_t off; + int err = 0; + if (it->offset_idx == it->offset_len) { + it->is_finished = 1; + return 1; + } + + reftable_block_done(&it->block_reader.block); + + off = it->offsets[it->offset_idx++]; + err = reader_init_block_reader(it->r, &it->block_reader, off, + BLOCK_TYPE_REF); + if (err < 0) { + return err; + } + if (err > 0) { + /* indexed block does not exist. */ + return REFTABLE_FORMAT_ERROR; + } + block_reader_start(&it->block_reader, &it->cur); + return 0; +} + +static int indexed_table_ref_iter_next(void *p, struct reftable_record *rec) +{ + struct indexed_table_ref_iter *it = p; + struct reftable_ref_record *ref = &rec->u.ref; + + while (1) { + int err = block_iter_next(&it->cur, rec); + if (err < 0) { + return err; + } + + if (err > 0) { + err = indexed_table_ref_iter_next_block(it); + if (err < 0) { + return err; + } + + if (it->is_finished) { + return 1; + } + continue; + } + /* BUG */ + if (!memcmp(it->oid.buf, ref->value.val2.target_value, + it->oid.len) || + !memcmp(it->oid.buf, ref->value.val2.value, it->oid.len)) { + return 0; + } + } +} + +int new_indexed_table_ref_iter(struct indexed_table_ref_iter **dest, + struct reftable_reader *r, uint8_t *oid, + int oid_len, uint64_t *offsets, int offset_len) +{ + struct indexed_table_ref_iter empty = INDEXED_TABLE_REF_ITER_INIT; + struct indexed_table_ref_iter *itr = + reftable_calloc(sizeof(struct indexed_table_ref_iter)); + int err = 0; + + *itr = empty; + itr->r = r; + strbuf_add(&itr->oid, oid, oid_len); + + itr->offsets = offsets; + itr->offset_len = offset_len; + + err = indexed_table_ref_iter_next_block(itr); + if (err < 0) { + reftable_free(itr); + } else { + *dest = itr; + } + return err; +} + +static struct reftable_iterator_vtable indexed_table_ref_iter_vtable = { + .next = &indexed_table_ref_iter_next, + .close = &indexed_table_ref_iter_close, +}; + +void iterator_from_indexed_table_ref_iter(struct reftable_iterator *it, + struct indexed_table_ref_iter *itr) +{ + assert(!it->ops); + it->iter_arg = itr; + it->ops = &indexed_table_ref_iter_vtable; +} |