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## see https://ragnarokresearchlab.github.io/file-formats/grf
class_name GRF
var header: Header
class Header:
const BYTE_LENGTH := 46
## Byte Length: 15
## Master of Magic
var signature: String
## Byte Length: 15
var encryption: PackedByteArray
## Byte Type: u32
## Byte Length: 4
var file_table_offset: int
## Byte Type: u32
## Byte Length: 4
var scrambling_seed: int
## Byte Type: u32
## Byte Length: 4
var scrambled_file_count: int
## Byte Type: u32
## Byte Length: 4
var version: int
func get_file_count() -> int:
return scrambled_file_count - scrambling_seed - 7
static func from_bytes(bytes: PackedByteArray):
var header = Header.new()
header.signature = bytes.slice(0, 15).get_string_from_utf8()
header.encryption = bytes.slice(15, 15 + 15)
header.file_table_offset = bytes.decode_u32(30)
header.scrambling_seed = bytes.decode_u32(34)
header.scrambled_file_count = bytes.decode_u32(38)
header.version = bytes.decode_u32(42)
return header
var file_table: FileTable
class FileTable:
const BYTE_LENGTH := 8
## Byte Type: u32
## Byte Length: 4
var compressed_size: int
## Byte Type: u32
## Byte Length: 4
var decompressed_size: int
var compressed_record_headers: PackedByteArray
var decompressed_record_headers: PackedByteArray
func generate_compressed_record_headers(grf_file: FileAccess):
compressed_record_headers = grf_file.get_buffer(compressed_size)
func decompress():
decompressed_record_headers = compressed_record_headers.decompress(
decompressed_size,
FileAccess.CompressionMode.COMPRESSION_DEFLATE
)
static func from_bytes(bytes: PackedByteArray):
var file_table = FileTable.new()
file_table.compressed_size = bytes.decode_u32(0)
file_table.decompressed_size = bytes.decode_u32(4)
return file_table
var file_entries: Array[FileEntry]
class FileEntry:
const BYTE_LENGTH := 17
var file_name: String
## Byte Type: u32
## Byte Length: 4
var compressed_size: int
## Byte Type: u32
## Byte Length: 4
var byte_aligned_size: int
## Byte Type: u32
## Byte Length: 4
var decompressed_size: int
## Byte Type: u8
## Byte Length: 1
var file_type: int
## Byte Type: u32
## Byte Length: 4
var offset: int
func get_byte_length() -> int:
return BYTE_LENGTH #+ file_name.to_ascii_buffer().size()
func get_file_path() -> String:
var parts = file_name.split("\\")
return "/".join(parts)
func get_contents(grf_file: FileAccess):
var previous_position = grf_file.get_position()
grf_file.seek(Header.BYTE_LENGTH + offset)
var buffer = grf_file.get_buffer(byte_aligned_size)
var contents = buffer.decompress(
decompressed_size,
FileAccess.CompressionMode.COMPRESSION_DEFLATE
)
grf_file.seek(previous_position)
return contents
static func from_bytes_with_filename(bytes: PackedByteArray, file_name: String):
var file_entry = FileEntry.new()
file_entry.file_name = file_name
file_entry.compressed_size = bytes.decode_u32(0)
file_entry.byte_aligned_size = bytes.decode_u32(4)
file_entry.decompressed_size = bytes.decode_u32(8)
file_entry.file_type = bytes.decode_u8(12)
file_entry.offset = bytes.decode_u32(13)
return file_entry
var file_access: FileAccess
static func open(path: String):
var grf = GRF.new()
grf.file_access = FileAccess.open(path, FileAccess.ModeFlags.READ)
grf.header = GRF.Header.from_bytes(grf.file_access.get_buffer(Header.BYTE_LENGTH))
grf.file_access.seek(Header.BYTE_LENGTH + grf.header.file_table_offset)
grf.file_table = FileTable.from_bytes(grf.file_access.get_buffer(8))
grf.file_table.generate_compressed_record_headers(grf.file_access)
grf.file_table.decompress()
grf.file_entries = [] as Array[FileEntry]
var file_entry_offset = 0
while file_entry_offset < grf.file_table.decompressed_record_headers.size():
var file_name_size = grf.file_table.decompressed_record_headers.find(0, file_entry_offset) + 1 - file_entry_offset
var file_entry = FileEntry.from_bytes_with_filename(
grf.file_table.decompressed_record_headers.slice(
file_entry_offset + file_name_size,
file_entry_offset + file_name_size + FileEntry.BYTE_LENGTH
),
grf.file_table.decompressed_record_headers.slice(
file_entry_offset,
file_entry_offset + file_name_size
).get_string_from_ascii()
)
grf.file_entries.append(file_entry)
file_entry_offset += file_entry.get_byte_length() + file_name_size
grf.write()
return grf
func write():
for file_entry in file_entries:
var file_path: String = file_entry.get_file_path()
var base_directory = DirAccess.open("res://data")
base_directory.make_dir_recursive("extracted/" + file_path.get_base_dir())
var file = FileAccess.open("res://data/extracted/%s" % [file_path], FileAccess.WRITE_READ)
file.store_buffer(file_entry.get_contents(file_access))
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