NSD

NSD is a custom file format created by Naughty Dog for use in the Crash games. The root directory of a Crash game CD will have several sub-directories, with names S0, S1, S2, and S3; within these sub-directories are pairs of files with the name S00000**.NSD/.NSF. Each pair corresponds to a specific level in the game, and these files contain the game data for that level. An NSD file is essentially an index for its paired NSF file, but in Crash 1 it contains additional information such as a level descriptor/header and a loading screen descriptor.

Format

Crash 1

Offset	Field	Size	Value
0x0	Entry Hash Table Offsets	4 bytes x 256	*
0x400	Chunk Count	4 bytes	c
0x404	Entry Hash Table Size	4 bytes	s
0x408	Unknown	4 bytes	*
0x40C	Unknown	4 bytes	*
0x410	Unknown	4 bytes	*
0x414	Unknown	4 bytes	*
0x418	Offset of Uncompressed Chunks	4 bytes	*
0x41C	Compressed Chunk Count	4 bytes	*
0x420	Compressed Chunk Offsets	4 bytes x 64	*
0x520	Entry Hash Table	4 bytes x 2 x s	*
0x520 + (8 x s) + 0x0	Level Header Magic Number	4 bytes	0x1
0x520 + (8 x s) + 0x4	Level ID	4 bytes	*
0x520 + (8 x s) + 0x8	Initial Zone EID	4 bytes	*
0x520 + (8 x s) + 0xC	Initial Camera Path (Item Index)	4 bytes	*
0x520 + (8 x s) + 0x10	Unknown	4 bytes	*
0x520 + (8 x s) + 0x14	Object Type -> Executable EID map	4 bytes x 64	*
?	Descriptor for 'loading screen' image	?

Structure

Crash 1

struct NSD
{
  union
  {
    unsigned long entryhashoffsets[256];
    unsigned long *entryhashbuckets[256];
  }
  unsigned long chunkcount;
  unsigned long entryhashcount;
  unsigned long unk_408;
  unsigned long unk_40C;
  unsigned long unk_410;
  unsigned long unk_414;
  unsigned long uncompressedoffset;
  unsigned long compressedcount;
  unsigned long compressedoffsets[64];
  hashpair      entryhash[entryhashcount];
  struct levelheader
  {
    const unsigned long magic = ?
    unsigned long levelID;
    unsigned long firstzone;
    unsigned long firstcampath;
    unsigned long unknown;
    unsigned long execeidmap[64];
  };
};

Purpose

TBD