Reference · Formats

The file table in the executable

partialfrom#1

CoversUS SLUS_006.50:0x800b2c40US SLUS_006.50:0x80019794US SLUS_006.50:0x80019a04

The game never opens a file by name. Every load names a file number, an index into a table of 714 (lba, size) pairs compiled into SLUS_006.50. The ISO directory is only there for the disc mastering; the port reads through this table the same way (rugrats_data::files).

Layout

Little-endian.

entry[714] at 0x800b2c40 .. 0x800b4290
  u32  lba     first sector on the disc; 0 = unused entry
  u32  size    bytes; for an interleaved stream, sectors x 2336

Fields

lba - matches the ISO directory's extent for every used entry (checked with rugrats-re files). 29 entries are 0.

size - equals the ISO size for Form 1 files. For the 58 interleaved files it is the sector count times 2336 (2352 less the 12-byte sync and 4-byte header), e.g. OPEN.BIN 7071 sectors: ISO 14481408, table 16517856.

The code

read_file(index, dest, len) at 0x80019794 indexes the table (index << 3), returns 0 straight away for an unused entry, then seeks with libcd and reads with retries ("Too many retries for seeking... I'm giving up!"). file_size(index) at 0x80019a04 returns size; for an unused entry it returns an uninitialised stack word instead.

Groups

By index, as rugrats-re files prints them:

The per-database groups have a slot for DB19 that is 0 everywhere: see the DB19 database.

Unknown

• Whether any load reaches a file by LBA without this table.