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write a function for processing NBT_LIST

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Quinn
2025-08-24 13:06:04 +02:00
parent ec04177f45
commit a6442a851e
1 changed files with 14 additions and 1 deletions
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15
src/dat/nbt.c
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@@ -124,6 +124,19 @@ MALLOC static void *nbt_procarr(const u8 *restrict buf, i32 nmem, uint size) {
return ptr; return ptr;
} }
/* processes a `NBT_LIST` tag, and returns a pointer to malloc'd data, or `NULL`, depending on its success */
MALLOC static void *nbt_proclist(const u8 *restrict buf) {
switch (*buf) {
case NBT_I8: return nbt_procarr(buf + 5, (i32)be32toh(*(u32 *)buf + 1), 1);
case NBT_I16: return nbt_procarr(buf + 5, (i32)be32toh(*(u32 *)buf + 1), 2);
case NBT_I32: // fall through
case NBT_F32: return nbt_procarr(buf + 5, (i32)be32toh(*(u32 *)buf + 1), 4);
case NBT_I64: // fall though
case NBT_F64: return nbt_procarr(buf + 5, (i32)be32toh(*(u32 *)buf + 1), 8);
default: return NULL;
}
}
/* readies the output data for export, returns the new buffer position, or `NULL` upon an error (may be out of bounds) */ /* readies the output data for export, returns the new buffer position, or `NULL` upon an error (may be out of bounds) */
const u8 *nbt_proctag(const u8 *restrict buf, u16 slen, void *restrict out) { const u8 *nbt_proctag(const u8 *restrict buf, u16 slen, void *restrict out) {
const u8 *ptr = buf + 3 + slen; const u8 *ptr = buf + 3 + slen;
@@ -141,7 +154,7 @@ const u8 *nbt_proctag(const u8 *restrict buf, u16 slen, void *restrict out) {
case NBT_ARR_I32: *(void **)out = nbt_procarr(ptr += 4, be32toh(*(u32 *)buf), 4); break; case NBT_ARR_I32: *(void **)out = nbt_procarr(ptr += 4, be32toh(*(u32 *)buf), 4); break;
case NBT_ARR_I64: *(void **)out = nbt_procarr(ptr += 8, be32toh(*(u64 *)buf), 8); break; case NBT_ARR_I64: *(void **)out = nbt_procarr(ptr += 8, be32toh(*(u64 *)buf), 8); break;
case NBT_LIST: // TODO: handle simple lists case NBT_LIST: return nbt_proclist(ptr);
default: default:
return NULL; return NULL;
} }