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implement handling compound lists

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This commit is contained in:
Quinn
2025-08-20 16:40:24 +02:00
parent 6a9d6f75a4
commit 23b64199d7
1 changed files with 42 additions and 6 deletions
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48
src/dat/nbt.c
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@@ -9,17 +9,34 @@
#include "../util/compat/endian.h"
#include "../util/intdef.h"
#define MAX_DEPTH 512
/* TODO: write test cases for this function:
* - list:compound...
* - non-existent type
* - compound:list:int32
* - string
*/
const u8 *nbt_nexttag(const u8 *restrict buf) {
const u8 *tag, *ptr;
u8 tags[MAX_DEPTH] = {0};
i32 lens[MAX_DEPTH] = {0};
uint dpt = 0;
u8 type;
tag = buf;
do {
ptr = tag + be16toh(*(u16 *)(tag + 1)) + 3; // set `ptr` to start of data
mems = 0;
ptr = tag;
if (lens[dpt]) {
type = lens[dpt];
lens[dpt]--;
dpt -= !lens[dpt];
} else {
type = *tag;
ptr += be16toh(*(u16 *)(tag + 1)) + 3;
}
switch (*tag) {
switch (type) {
case NBT_I8: ptr += 1; break;
case NBT_I16: ptr += 2; break;
case NBT_I32: // fall through
@@ -33,9 +50,28 @@ const u8 *nbt_nexttag(const u8 *restrict buf) {
case NBT_STR: ptr += 2 + (u16)be16toh(*(u16 *)ptr) * 1; break;
case NBT_END: dpt--; break;
case NBT_COMPOUND: dpt++; break;
case NBT_COMPOUND: dpt += (tags[dpt] && *tag) ? 1 : -1; break;
// TODO: handle (compound) lists somehow
case NBT_LIST: {
tag = ptr; // temporarily store the tag to cache later
switch (*(ptr++)) {
case NBT_I8: ptr += 1 * (i32)be32toh(*(u32 *)ptr); break;
case NBT_I16: ptr += 2 * (i32)be32toh(*(u32 *)ptr); break;
case NBT_I32: // fall through
case NBT_F32: ptr += 4 * (i32)be32toh(*(u32 *)ptr); break;
case NBT_I64: // fall through
case NBT_F64: ptr += 8 * (i32)be32toh(*(u32 *)ptr); break;
default:
// TODO: handle out of bounds... Might not be required if we use flexible array member
dpt++;
tags[dpt] = *tag;
lens[dpt] = (i32)be32toh(*(u32 *)ptr);
break;
}
ptr += 4;
break;
}
default: return NULL; // unexpected value; buffer is likely corrupt
}