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Fix parser on big endian hosts

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pancake committed 2026-04-16 18:45:50 +02:00
1 parent e76592a587
commit 2b39ebd659
1 file changed
+14 -9
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src/lib/lib.c
+14 -9
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@@ -33,21 +33,18 @@ R_API R2UnityMetadata *r2unity_parse_metadata (RBuffer *buf) {
if (!meta) {
return NULL;
}
// read sanity and version first
uint32_t sanity = 0;
int32_t version = 0;
if (r_buf_read_at (buf, 0, (ut8 *)&sanity, 4) != 4) {
// Read sanity and version from the on-disk little-endian layout.
ut8 preamble[8];
if (r_buf_read_at (buf, 0, preamble, sizeof (preamble)) != (st64) sizeof (preamble)) {
R_FREE (meta);
return NULL;
}
uint32_t sanity = RD_LE32 (preamble);
if (sanity != IL2CPP_MAGIC) {
R_FREE (meta);
return NULL;
}
if (r_buf_read_at (buf, 4, (ut8 *)&version, 4) != 4) {
R_FREE (meta);
return NULL;
}
int32_t version = (int32_t) RD_LE32 (preamble + 4);
meta->version = version;
size_t header_size = 0;
if (version < 24 || version > 31) {
@@ -63,10 +60,18 @@ R_API R2UnityMetadata *r2unity_parse_metadata (RBuffer *buf) {
header_size = sizeof (Il2CppGlobalMetadataHeader_v29);
}
// read full header for selected version
if (r_buf_read_at (buf, 0, (ut8 *)&meta->header.v24, header_size) != (st64)header_size) {
if (r_buf_read_at (buf, 0, (ut8 *) &meta->header.v24, header_size) != (st64) header_size) {
R_FREE (meta);
return NULL;
}
// Normalize header from on-disk little-endian to native byte order.
// Every field in the Il2Cpp header structs is a 32-bit word, so a single
// in-place RD_LE32 sweep handles all versions and is a no-op on LE hosts.
uint32_t *hdr_words = (uint32_t *) &meta->header;
size_t nfields = header_size / sizeof (uint32_t);
for (size_t i = 0; i < nfields; i++) {
hdr_words[i] = RD_LE32 ((const ut8 *) &hdr_words[i]);
}
meta->buf = buf;
/* Normalize header fields depending on version to simplify later access */
if (meta->version < 27) {