Lot Subfile
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This page pertains to the format of the Lot Subfile within the Savegame files. This file has Type ID C9BD5D4A. It can be viewed and mapped using the SC4 Savegame Explorer, but not edited. This particular subfile was decoded by RippleJet.
Description
This subfile contains data about all the lots in the city. Used for both ploppable and growable lots.
Structure
The Lot Subfile has the following format:
DWORD Size DWORD CRC DWORD Memory WORD Major Version? (only seen 0x0008) DWORD Lot IID BYTE Flag byte 1 (See Appendix 1 below) BYTE Min X Tile BYTE Min Z Tile BYTE Max X Tile BYTE Max Z Tile BYTE Commute X Tile BYTE Commute Z Tile FLOAT32 Y Position FLOAT32 Y Coordinate if slope conforming, height above Y Position (0x00000000 if Lot Foundation) FLOAT32 Y Coordinate if slope conforming, height above Y Position (0x00000000 if Lot Foundation) BYTE Lot Width BYTE Lot Depth BYTE Lot Orientation BYTE Flag byte 2 (See Appendix 2 below) BYTE Flag byte 3 (See Appendix 3 below) BYTE Zone Type BYTE Zone Wealth DWORD Date Lot Appeared (was plopped or grew) DWORD Building IID BYTE Unknown, several values seen, but the same value often appears in several lots DWORD Memory Address for linked industrial lot DWORD 0x4A232DA8, Industry Subfile Type ID. Appears only if the previous DWORD is not 0x00000000 DWORD Memory Address of the Anchor or Farm Lot DWORD 0xC9BD5D4A, Lot Subfile Type ID. Appears only if the previous DWORD is not 0x00000000 BYTE Count (0x00 or 0x01) BYTE Count of RCI Types (0x01, 0x02 or 0x03) DWORD Demand Source Index (See Appendix 4 below) WORD Capacity BYTE Count of RCI Types (0x00, 0x01, 0x02 or 0x03) DWORD Demand Source Index (See Appendix 4 below) WORD Total Capacity (including filler lots, e.g. farm fields, mechanics and outs) FLOAT32 Total § Capacity (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100 FLOAT32 Total §§ Capacity (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100 FLOAT32 Total §§§ Capacity (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100 WORD 0x0002 (Unknown) DWORD Count of Properties (I've seen up to 0x00000007) SGPROP SaveGame Properties, repeated Count times (See Appendix 5 below) DWORD Count of Commute Blocks (number of destinations commuted to from here) DWORD Count of Commute Paths (usually 0x00000002 = morning and evening) DWORD Count of Bytes in the Path BYTES Commute Path (See Appendix 6 below) DWORD Number of Commuters BYTE Unknown, 0x00 or 0x03 BYTE Unknown, 0x00, 0x01 or 0x02 BYTE Unknown, 0x08, 0x09, 0x0A or 0x0B (0x00 if the commute path has disappeared) BYTE Unknown, 0x00 or 0x03 (0x04 if the commute path has disappeared) SINT16 Commute Destination, X Tile (See Appendix 7 below) SINT16 Commute Destination, Z Tile (See Appendix 7 below) FLOAT32 Trip Length DWORD Unknown (See Appendix 8 below) BYTE Unknown (takes many different values)
Appendix 1 - Flag Byte 1
0x01 (00000001b) - Might have to do with road access
0x02 (00000010b) - Might have to do with road (job?) access
0x04 (00000100b) - Might have to do with road access
0x08 (00001000b) - Means the lot is watered
0x10 (00010000b) - Means the lot is powered
0x20 (00100000b) - Means the lot is marked historical
0x40 (01000000b) - Might mean the lot is built
Appendix 2 - Flag Byte 2
This one is normally 0x03, but 0x00, 0x01, 0x02, 0x04 and 0x06 have also been seen. It seems to be going hand-in-hand with Flag Byte 1:
0x01 (00000001b) - Flag Byte 1 = 0x10 - Powered (empty growable zones)
0x02 (00000010b) - Flag Byte 1 = 0x50 - Powered and built
0x03 (00000011b) - Flag Byte 1 = 0x58 - Powered, watered and built
0x04 (00000100b) - Seen it once on a tall office under construction
0x06 (00000110b) - Seen it once on a water tower without power
Appendix 3 - Flag Byte 3
This is normally 0x00, but 0x01, 0x03 and 0x06 have also been seen. All those having 0x01 or 0x03 were growable lots under construction. Thus, the lowest bit seems obvious after a number of confirmations:
0x01 (00000001b) - A growable lot that is under construction
0x02 (00000010b) - ?
0x04 (00000100b) - ?
Appendix 4 - Demand Source Index
0x00001010 = R§
0x00001020 = R§§
0x00001030 = R§§§
0x00003110 = CS§
0x00003120 = CS§§
0x00003130 = CS§§§
0x00003320 = CO§§
0x00003330 = CO§§§
0x00004100 = IR
0x00004200 = ID
0x00004300 = IM
0x00004400 = IHT
Appendix 5 - Structure of SGPROP (SaveGame Properties)
This structure is used on the SGPROP entries. Known entries are listed further below.
DWORD Property Name Value DWORD Property Name Value (doubled for some unknown reason) DWORD 0x00000000 BYTE Data Type, 01=UInt8, 02=UInt16, 03=UInt32, 07=SInt32, 08=SInt64, 09=Float32, 0B=Boolean BYTE KeyType, 0x00 = 0 reps, 0x80 = more than 0 reps WORD 0x0000 DWORD Rep Count (this one appears only if KeyType = 0x80) DATA Property Value (repeated Rep Count times, type according to Data Type)
Appendix 6 - Structure of Commute Paths
BYTE Starting Traffic Type (see below)
BYTE Path Start Tile X (network in front of the lot)
BYTE Path Start Tile Z (network in front of the lot)
Commute legs, repeated for each transit switch
BYTE Transit Switch 0x4T (T = Traffic type, see below)
BYTE Length of Path (Count of quads)
TAYSTE Path Direction (0 = West, 1 = North, 2 = East, 3=South)
TAYSTES 00b (repeated 0, 1, 2 or 3 times, in order to fill the last BYTE)
Traffic types are in the same order as in the Traffic Simulator:
0x00 = Walk
0x01 = Car
0x02 = Bus
0x03 = Passenger Train
0x04 = Freight Truck
0x05 = Freight Train
0x06 = Subway
0x07 = Light Rail
0x08 = Monorail
A tayste is two bits, one byte contains four taystes. Each tayste takes the path one tile in the direction indicated.
Appendix 7 - Destination Tile
A job located in a neighbouring city has the XZ coordinate of the border crossing.
- A job located in the western neighbour has an X coordinate of -1 (0xFFFF).
- A job located in the northern neighbour has a Z coordinate of -1 (0xFFFF).
- A job located in the eastern neighbour has an X coordinate of 64 (0x0040), 128 (0x0080) or 256 (0x0100).
- A job located in the southern neighbour has a Z coordinate of 64 (0x0040), 128 (0x0080) or 256 (0x0100).
If the commute path has disappeared (e.g. work demolished or redeveloping), the X coordinate becomes 0xDFA8 (-8,280).
Appendix 8 - Unknown
For residential lots, this value is often 2, but values of 9 and 11 have also been observed. This value is always 16 for industrial lots. If the commute path has disappeared (e.g. work demolished or redeveloping), this DWORD becomes 0x0012FC70.
Savegame Properties (SGProps)
Known entries for SGPROP for the Lot Subfile are listed below.
0x2A4F9C74 - Unknown Type: UInt32 Rep Count = 1 (usually, but 6 has been seen for the passenger rail station)
0x4A611773 - Unknown Type: UInt8 (Type 01) Rep Count = 0
0x691C863C - Unknown Type: UInt32 Rep Count = 0
0x8999B10B - Unknown Type: UInt32 Rep Count = 0
0x8999B20B - Unknown Type: UInt32 Rep Count = 0
0x8A0B4100 - Job/Freight Capacity and Usage (for C, I and Civics) Type: UInt16 (Type 02) Rep Count = 12 Rep 1 = Integer Value of Total § Capacity Rep 2 = Integer Value of Total §§ Capacity Rep 3 = Integer Value of Total §§§ Capacity Rep 4 = Freight Capacity (only for ports) Rep 5 = Some § Job Count Rep 6 = Some §§ Job Count Rep 7 = Some §§§ Job Count Rep 8 = Some Freight Usage (only for ports) Rep 9 = Actual § Job Count Rep 10 = Actual §§ Job Count Rep 11 = Actual §§§ Job Count Rep 12 = Actual Freight Usage (only for ports)
0xC999C45E - Unknown Type: UInt32 Rep Count = 0
0xC999E206 - Unknown Type: UInt32 Rep Count = 0
0xE999B11F - Unknown Type: UInt32 Rep Count = 0
0xEA54D283 - Budget Item: Department Type: UInt32 Rep Count = 1 (0xC921CEEB = Mass Transit)
0xEA54D284 - Budget Item: Line Type: UInt32 Rep Count = 1 (0x00000001)
0xEA54D285 - Budget Item: Purpose Type: UInt32 Rep Count = 1 (0xCA550301 = Mass Transit Switch)
0xEA54D286 - Budget Item: Cost Type: SInt64 Rep Count = 1 (0x000000000000000A = 10 § per month)
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