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add functions for incrementing to the next tag

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Quinn
2025-08-07 12:06:53 +02:00
parent f952268152
commit 1052dcaac9
2 changed files with 57 additions and 23 deletions
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21
src/dat/nbt.h
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@@ -48,18 +48,25 @@ CONST int nbt_primsize(u8 tag);
* returns a boolean value. */
CONST int nbt_isprim(u8 tag);
/* searches for the end of a compound tag without processing data, the final pointer is returned.
* `NULL` is returned upon failure, the otherwise returned pointer is not guaranteed to be valid.
* `cdat` is assumed to be the start of the **compound tag's data**. */
PURE NONNULL((1)) const u8 *nbt_nextcompound(const u8 *restrict cdat);
/* searches for the end of a list tag without processing data, the final pointer is returned.
* `NULL` is returned upon failure, the otherwise returned pointer is not guaranteed to be valid.
* `ldat` is assumed to be the start of the **list tag's data.** */
PURE NONNULL((1)) const u8 *nbt_nextlist(const u8 *restrict ldat);
/* searches for the end of a named tag without processing data, the final pointer is returned.
* `NULL` is returned upon failure, the otherwise returned pointer is not guaranteed to be valid. */
PURE NONNULL((1)) const u8 *nbt_nexttag(const u8 *restrict buf, u16 naml);
/* returns the name length of a specific tag. `buf` is the pointer to start of the tag */
atrb_pure atrb_nonnull(1) static inline u16 nbt_namelen(const u8 *restrict buf) {
assert(*buf != NBT_END);
return be16toh(*(u16 *)(buf + 1));
}
/* returns the (expected) pointer of the tag following this one.
* `NULL` is returned if anything went wrong. */
atrb_pure atrb_nonnull(1) const u8 *nbt_nexttag(const u8 *restrict buf, u16 naml);
/* gets the byte size of an NBT tag's data (excluding id and name), returns `0` upon error. */
atrb_pure size_t nbt_tagdatlen(const u8 *buf);
/* processes the uncompressed `NBT` data in `buf`, with a size of `len`. */
atrb_nonnull(1, 3) int nbt_proc(struct nbt_path const *restrict paths, uint npaths, const u8 *restrict buf, size_t len);