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/*

* 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 "blocksource.h"

#include "constants.h"

#include "reftable-error.h"

#include "table.h"

int iterator_seek(struct reftable_iterator *it, struct reftable_record *want)

{

return it->ops->seek(it->iter_arg, want);

}

int iterator_next(struct reftable_iterator *it, struct reftable_record *rec)

{

return it->ops->next(it->iter_arg, rec);

}

static int empty_iterator_seek(void *arg REFTABLE_UNUSED, struct reftable_record *want REFTABLE_UNUSED)

{

return 0;

}

static int empty_iterator_next(void *arg REFTABLE_UNUSED, struct reftable_record *rec REFTABLE_UNUSED)

{

return 1;

}

static void empty_iterator_close(void *arg REFTABLE_UNUSED)

{

}

static struct reftable_iterator_vtable empty_vtable = {

.seek = &empty_iterator_seek,

.next = &empty_iterator_next,

.close = &empty_iterator_close,

};

void iterator_set_empty(struct reftable_iterator *it)

{

assert(!it->ops);

it->iter_arg = NULL;

it->ops = &empty_vtable;

}

static void filtering_ref_iterator_close(void *iter_arg)

{

struct filtering_ref_iterator *fri = iter_arg;

reftable_buf_release(&fri->oid);

reftable_iterator_destroy(&fri->it);

}

static int filtering_ref_iterator_seek(void *iter_arg,

struct reftable_record *want)

{

struct filtering_ref_iterator *fri = iter_arg;

return iterator_seek(&fri->it, want);

}

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 (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 = {

.seek = &filtering_ref_iterator_seek,

.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);

block_source_release_data(&it->block.block_data);

reftable_free(it->offsets);

reftable_buf_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;

}

block_source_release_data(&it->block.block_data);

off = it->offsets[it->offset_idx++];

err = table_init_block(it->table, &it->block, off, REFTABLE_BLOCK_TYPE_REF);

if (err < 0) {

return err;

}

if (err > 0) {

/* indexed block does not exist. */

return REFTABLE_FORMAT_ERROR;

}

block_iter_init(&it->cur, &it->block);

return 0;

}

static int indexed_table_ref_iter_seek(void *p REFTABLE_UNUSED,

struct reftable_record *want REFTABLE_UNUSED)

{

return REFTABLE_API_ERROR;

}

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 indexed_table_ref_iter_new(struct indexed_table_ref_iter **dest,

struct reftable_table *t, 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;

int err = 0;

itr = reftable_calloc(1, sizeof(*itr));

if (!itr) {

err = REFTABLE_OUT_OF_MEMORY_ERROR;

goto out;

}

*itr = empty;

itr->table = t;

err = reftable_buf_add(&itr->oid, oid, oid_len);

if (err < 0)

goto out;

itr->offsets = offsets;

itr->offset_len = offset_len;

err = indexed_table_ref_iter_next_block(itr);

if (err < 0)

goto out;

*dest = itr;

err = 0;

out:

if (err < 0) {

*dest = NULL;

reftable_free(itr);

}

return err;

}

static struct reftable_iterator_vtable indexed_table_ref_iter_vtable = {

.seek = &indexed_table_ref_iter_seek,

.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;

}

void reftable_iterator_destroy(struct reftable_iterator *it)

{

if (!it->ops)

return;

it->ops->close(it->iter_arg);

it->ops = NULL;

REFTABLE_FREE_AND_NULL(it->iter_arg);

}

int reftable_iterator_seek_ref(struct reftable_iterator *it,

const char *name)

{

struct reftable_record want = {

.type = REFTABLE_BLOCK_TYPE_REF,

.u.ref = {

.refname = (char *)name,

},

};

return it->ops->seek(it->iter_arg, &want);

}

int reftable_iterator_next_ref(struct reftable_iterator *it,

struct reftable_ref_record *ref)

{

struct reftable_record rec = {

.type = REFTABLE_BLOCK_TYPE_REF,

.u = {

.ref = *ref

},

};

int err = iterator_next(it, &rec);

*ref = rec.u.ref;

return err;

}

int reftable_iterator_seek_log_at(struct reftable_iterator *it,

const char *name, uint64_t update_index)

{

struct reftable_record want = {

.type = REFTABLE_BLOCK_TYPE_LOG,

.u.log = {

.refname = (char *)name,

.update_index = update_index,

},

};

return it->ops->seek(it->iter_arg, &want);

}

int reftable_iterator_seek_log(struct reftable_iterator *it,

const char *name)

{

return reftable_iterator_seek_log_at(it, name, ~((uint64_t) 0));

}

int reftable_iterator_next_log(struct reftable_iterator *it,

struct reftable_log_record *log)

{

struct reftable_record rec = {

.type = REFTABLE_BLOCK_TYPE_LOG,

.u = {

.log = *log,

},

};

int err = iterator_next(it, &rec);

*log = rec.u.log;

return err;

}