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add funciton for data loading/processing

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Quinn
2025-07-23 16:37:10 +02:00
parent 1fb878b5ae
commit 54e4bf45f9
1 changed files with 31 additions and 5 deletions
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36
src/dat/nbt.c
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@@ -37,12 +37,38 @@ static u8 const *nbt_nexttag(u8 const *restrict buf, u16 naml) {
return buf + naml + len + 3; return buf + naml + len + 3;
} }
// TODO: not actually doing anything
/* readies the output data for export, returns the new buffer position, or `NULL` upon an error (may be out of bounds) */
static u8 const *nbt_proctag(u8 const *restrict buf, u16 slen) {
u8 const *ptr = buf + 3 + slen;
u8 dat[8];
size_t arrlen = 0;
switch (*buf) {
// integral types
case NBT_I8: *dat = *ptr; return ptr;
case NBT_I16: *(u16 *)dat = be16toh(*(u16 *)ptr); return ptr + 2;
case NBT_I32: __attribute__((fallthrough));
case NBT_F32: *(u32 *)dat = be16toh(*(u32 *)ptr); return ptr + 4;
case NBT_I64: __attribute__((fallthrough));
case NBT_F64: *(u64 *)dat = be16toh(*(u64 *)ptr); return ptr + 8;
// arrays, handled differently
case NBT_LIST: __attribute__((fallthrough));
case NBT_ARR_I8: __attribute__((fallthrough));
case NBT_STR: __attribute__((fallthrough));
case NBT_ARR_I32: __attribute__((fallthrough));
case NBT_ARR_I64:
// arrlen = nbt_arrbsize(ptr);
break;
default: return NULL;
}
if (!arrlen) return NULL;
return ptr + nbt_primsize(*buf);
}
int nbt_proc(void **restrict datout, u8 const *restrict buf, size_t len) { int nbt_proc(void **restrict datout, u8 const *restrict buf, size_t len) {
// first byte should be a compound tag
if (*buf != NBT_COMPOUND) return 1;
uint ncomp = 1;
// ignore the first tag + its name, so we start with the juicy data // ignore the first tag + its name, so we start with the juicy data
uint tmp = nbt_strlen(buf + 1) + 3; uint tmp = nbt_strlen(buf + 1) + 3;
buf += tmp; buf += tmp;