Format: BLK editor blocks

Format: BLK editor blocks (old)

An older format for level editor block icons, that was replaced in favor of BLX files.

File format

Byte Order: Little Endian

BLK Header

Off/Len	Type	Value	Description
0,4	char[4]	"INDX"	File signature
4,4	uint32	Unknown	PREDUG.BLK: 12, TERRAIN.BLK: 32, HEIGHT.BLK: 68
8,4	uint32	Count	Number of icons PREDUG.BLK: 02, TERRAIN.BLK: 07, HEIGHT.BLK: 16
c,4N	uint32[N]	Offsets	Icon offsets, relative to end of this table (first should be 0)
10,*N	Icon[N]	Icons	Region of icons data. Refer to offsets, over reading without seeking

BLK Icon

Off/Len	Type	Value	Description
0,4	uint32	Size	Size of structure (everything after this field)
4,4	uint32	Unknown1	0
8,4	uint32	Unknown2	8
c,4	uint32	Unknown3	0
10,4	char[4]	Format	"64K " Designated output format after reading the icon?
14,4	char[4]	Compression	"RAW " Method for reading the icon data?
18,4	uint32	PackSize	Storage size of icon data payload (everything after this field)
1c,4	char[4]	PackFormat	"64K " Storage format of icon data being read? (same as Format since Compression == "RAW "?)
20,4	uint32	Width	Icon pixel width
24,4	uint32	Height	Icon pixel height
28,2N	uint16[w*h]	Pixels	Pixels stored in true 16-bit colour, lines are not vertically flipped.

channel: RRRR RGGG GGGB BBBB
    bit: 31                0