File Structure fully deciphered!

Decompiling not guaranteed to be fully deciphered, need to play around with custom line type values.

The structure and basic language syntax for Cat Scenes are slightly over 20 years old now, as they existed in the original CatSystem (1) engine in the late 1990's.

Data Type	Value	Description
char[8]	"CatScene"	File Signature
uint32	CompressedSize	Compressed size of ScriptData
uint32	DecompressedSize	Decompressed size of ScriptData
byte[CompressedSize]	ScriptData	Zlib-compressed scene script contents

Data Type	Value	Description
uint32	ScriptLength	Size of ScriptData excluding sizeof(Header)
uint32	InputCount	Number of Input Offsets
uint32	OffsetTable	Offset to String Offset Table
uint32	StringTable	Offset to String Table

EntryCount = (StringTable - OffsetTable) / 4

These values can be calculated programmatically and are not necessary to read when parsing the file. They mark the offsets and indexes of the script line after every Input Flag line and most likely aid the game engine in skipping.

N = InputCount

Data Type	Value	Description
uint32	OffsetNext	Offset from Index to line after next input
uint32	Index	Index of line after input

Position = sizeof(Header) + OffsetTable
N = EntryCount

Data Type	Value	Description
uint32	Offset	Offset of to String n

The string table for script lines. Each line has a type that determines what it does, and content that is either used to parse a command or display a message or name.

Position = sizeof(Header) + StringTable + StringOffsets[n]
N = EntryCount

Data Type	Value	Description
uint16	Type	Action performed by the line
string	Content	Content of the line

(There may be more unknown values that are not listed here)

Name	Value	Description
Input	0x0201	Wait for input after message
Page	0x0301	Novel page break and wait for input after message
Message	0x2001	Display a message
Name	0x2101	Set speaker of the message
Command	0x3001	Perform any other command
InputFlag	0x0200	Any type with this flag is treated as input