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move utility functions upwards to keep the logical order

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This commit is contained in:
Quinn
2025-08-07 09:40:46 +02:00
parent ff7598a7e3
commit 4b2404e903
2 changed files with 60 additions and 60 deletions
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106
src/dat/nbt.c
View File

@@ -7,6 +7,59 @@
#include "../util/compat/endian.h"
#include "../util/types.h"
int nbt_isprim(u8 tag) {
switch (tag) {
case NBT_I8:
case NBT_I16:
case NBT_I32:
case NBT_F32:
case NBT_I64:
case NBT_F64:
return 1;
default:
return 0;
}
}
int nbt_primsize(u8 tag) {
switch (tag) {
case NBT_I8: return 1;
case NBT_I16: return 2;
case NBT_I32: // fall through
case NBT_F32: return 4;
case NBT_I64: // fall through
case NBT_F64: return 8;
default: return -1;
}
}
size_t nbt_tagdatlen(const u8 *restrict buf) {
size_t mems = 0;
switch (*buf) {
case NBT_I8:
case NBT_I16:
case NBT_I32:
case NBT_F32:
case NBT_I64:
case NBT_F64:
mems = nbt_primsize(*buf);
return -(mems >= 0) & mems;
case NBT_ARR_I64: mems += sizeof(i64) - sizeof(i32); __attribute__((fallthrough));
case NBT_ARR_I32: mems += sizeof(i32) - sizeof(i8); __attribute__((fallthrough));
case NBT_ARR_I8: return +mems * (i32)be32toh(*(u32 *)(buf)) + 4;
case NBT_STR: return be16toh(*(u16 *)buf) + 2;
case NBT_LIST:
mems = nbt_primsize(*buf);
if (mems > 0) return mems * (i32)be32toh(*(u32 *)(buf + 1)) + 5;
return 0;
default: return 0;
}
}
const u8 *nbt_nexttag(const u8 *restrict buf, u16 naml) {
size_t len = nbt_tagdatlen(buf);
if (!len) return NULL; // TODO: compound tags should be handled here
@@ -95,56 +148,3 @@ int nbt_proc(struct nbt_path const *restrict pats, uint npats, const u8 *restric
// TODO: finish function
return !dpt;
}
int nbt_primsize(u8 tag) {
switch (tag) {
case NBT_I8: return 1;
case NBT_I16: return 2;
case NBT_I32: // fall through
case NBT_F32: return 4;
case NBT_I64: // fall through
case NBT_F64: return 8;
default: return -1;
}
}
size_t nbt_tagdatlen(const u8 *restrict buf) {
size_t mems = 0;
switch (*buf) {
case NBT_I8:
case NBT_I16:
case NBT_I32:
case NBT_F32:
case NBT_I64:
case NBT_F64:
mems = nbt_primsize(*buf);
return -(mems >= 0) & mems;
case NBT_ARR_I64: mems += sizeof(i64) - sizeof(i32); __attribute__((fallthrough));
case NBT_ARR_I32: mems += sizeof(i32) - sizeof(i8); __attribute__((fallthrough));
case NBT_ARR_I8: return +mems * (i32)be32toh(*(u32 *)(buf)) + 4;
case NBT_STR: return be16toh(*(u16 *)buf) + 2;
case NBT_LIST:
mems = nbt_primsize(*buf);
if (mems > 0) return mems * (i32)be32toh(*(u32 *)(buf + 1)) + 5;
return 0;
default: return 0;
}
}
int nbt_isprim(u8 tag) {
switch (tag) {
case NBT_I8:
case NBT_I16:
case NBT_I32:
case NBT_F32:
case NBT_I64:
case NBT_F64:
return 1;
default:
return 0;
}
}

14
src/dat/nbt.h
View File

@@ -41,6 +41,13 @@ struct nbt_path {
i16 len; // specifies the length of the NBT elements
};
/* gets the tag size of primitive types, returns `>0` on success, `<0` on failure */
CONST int nbt_primsize(u8 tag);
/* checks whether the tag is a primitive data tag. (not recommended for filtering tags, use a `switch`)
* returns a boolean value. */
CONST int nbt_isprim(u8 tag);
/* 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);
@@ -51,15 +58,8 @@ atrb_pure atrb_nonnull(1) static inline u16 nbt_namelen(const u8 *restrict buf)
* `NULL` is returned if anything went wrong. */
atrb_pure atrb_nonnull(1) const u8 *nbt_nexttag(const u8 *restrict buf, u16 naml);
/* checks whether the tag is a primitive data tag. (not recommended for filtering tags, use a `switch`)
* returns a boolean value. */
atrb_const int nbt_isprim(u8 tag);
/* 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);
/* gets the tag size of primitive types, returns `>0` on success, `<0` on failure */
atrb_const int nbt_primsize(u8 tag);
/* 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);