Classes
class	Bnd4Entry
	One decoded BND4 entry: its index and where its blob lives in the file. More...

Functions
	parse_bnd4 (data)
	Parse and validate the BND4 entry table.

	checksum_ok (data, entry)
	Does this entry blob carry a valid MD5 checksum wrapper?

Variables
int	BND4_HEADER_LEN = 64
	Size of the fixed BND4 file header, in bytes.

int	BND4_ENTRY_LEN = 32
	Size of one BND4 entry header, in bytes.

Detailed Description

The BND4 archive every .sl2 is, and its entry table.

Function Documentation

◆ parse_bnd4()

sl2.bnd4.parse_bnd4 ( data )

Parse and validate the BND4 entry table.

Refuses anything that is not a well-formed BND4 archive: bad magic, a silly entry count, or an entry whose blob would fall outside the file. This is the boundary check that lets everything downstream trust its offsets.

Parameters

data	The full `.sl2` bytes.

Returns: A list of Bnd4Entry.

Exceptions

SystemExit on any structural problem.

Definition at line 37 of file bnd4.py.

◆ checksum_ok()

sl2.bnd4.checksum_ok	(	data,
		entry
	)

Does this entry blob carry a valid MD5 checksum wrapper?

Every Souls game prefixes each entry with MD5(rest). It is not a game discriminator (they all have it), but it is a cheap integrity check.

Parameters

data	The full file bytes.
entry	The entry to check.

Returns: True if blob[0:16] equals the MD5 of the remaining blob bytes.

Definition at line 65 of file bnd4.py.

Variable Documentation

◆ BND4_HEADER_LEN

int sl2.bnd4.BND4_HEADER_LEN = 64

Size of the fixed BND4 file header, in bytes.

Definition at line 9 of file bnd4.py.

◆ BND4_ENTRY_LEN

int sl2.bnd4.BND4_ENTRY_LEN = 32

Size of one BND4 entry header, in bytes.

Definition at line 13 of file bnd4.py.

Classes

Functions