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nostrdb/blocks: expose block iterator internals

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so we don't need heap allocation. we will be calling this a lot in tight
render loops, we don't want to be allocating on each frame.

Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin
2023-12-30 19:19:15 -08:00
committed by Daniel D’Aquino
parent d063362bd7
commit c677233dcb
5 changed files with 50 additions and 56 deletions
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36
nostrdb/src/block.c
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@@ -4,13 +4,6 @@
#include "block.h"
#include <stdlib.h>
struct ndb_block_iterator {
const char *content;
struct ndb_blocks *blocks;
struct ndb_block block;
struct cursor cur;
};
int push_str_block(struct cursor *buf, const char *content, struct ndb_str_block *block) {
return cursor_push_varint(buf, block->str - content) &&
cursor_push_varint(buf, block->len);
@@ -133,32 +126,25 @@ enum ndb_block_type ndb_get_block_type(struct ndb_block *block) {
}
// BLOCK ITERATORS
struct ndb_block_iterator *ndb_blocks_iterate_start(const char *content, struct ndb_blocks *blocks) {
struct ndb_block_iterator *iter = malloc(sizeof(*iter));
if (!iter)
return NULL;
void ndb_blocks_iterate_start(const char *content, struct ndb_blocks *blocks, struct ndb_block_iterator *iter) {
iter->blocks = blocks;
iter->content = content;
make_cursor((unsigned char *)blocks->blocks,
blocks->blocks + blocks->blocks_size, &iter->cur);
return iter;
}
void ndb_blocks_iterate_free(struct ndb_block_iterator *iter)
{
if (iter)
free(iter);
iter->p = blocks->blocks;
}
struct ndb_block *ndb_blocks_iterate_next(struct ndb_block_iterator *iter)
{
while (iter->cur.p < iter->cur.end) {
if (!pull_block(iter->content, &iter->cur, &iter->block)) {
struct cursor cur;
cur.start = iter->blocks->blocks;
cur.p = iter->p;
cur.end = iter->blocks->blocks + iter->blocks->blocks_size;
while (cur.p < cur.end) {
if (!pull_block(iter->content, &cur, &iter->block)) {
iter->p = cur.p;
return NULL;
} else {
iter->p = cur.p;
return &iter->block;
}
}