BFEVFL

bfevfl is a binary file format for event flows.

Structures

bfevfl is a little endian format, so values are stored in little endian even on Wii U.

bfevfl uses pointers very heavily. All pointers are always 64 bit long -- since the same format is used on the Switch which is a 64 bit platform -- and must be present in the #Relocation table.

There is no fixed order for most sections. Therefore, this article will only document the data structures and the most common order. For more details, it is recommended to look at the evfl library directly.

Header

Offset	Type	Description
0x0	char[8]	Magic ("BFEVFL\x00\x00")
0x8	u16	Version (0x0300)
0xa	u8	Unknown (must be zero)
0xb	u8	Unknown
0xc	u16	Byte order mark
0xe	u8	Alignment (to get the actual value: 1 << raw_value)
0xf	u8	Unknown
0x10	u32	File name offset
0x14	u16	Is relocated flag (set in memory)
0x16	u16	First block offset
0x18	u32	Relocation table offset
0x1c	u32	File size
0x20	u16	Number of flowcharts
0x22	u16	Number of timelines
0x24	u32	Padding
0x28	Flowchart*	Flowchart (nullptr if no flowchart)
0x30	Dic*	Flowchart name dictionary
0x38	Timeline*	Timeline (nullptr if no timeline)
0x40	Dic*	Timeline name dictionary

Tools

• evfl: Python library for parsing and writing event flows
• EventEditor: graphical editor for event flows