Data Block Structure

Note: Data Block 10, the “Image Data” Data Block, has no Data Block Header, no Data Block Footer, and no Data Fields. It only consists of image data.

All other Data Blocks follow the structure described below.

Data Block Header

The start of each Data Block starts with 2x uint32 numbers.

The first number is the length in bytes of this Data Block Header and all the following Data Block fields, (including the last field, Field Type 0.) This length does not include the Data Block Footer.

The second number is currently of unknown significance. It has been observed to be one of: 1, 2, 4, 7, 8.

Data Block Header

Bytes	Type	Description
0-3	uint32	Data Block Length in Bytes (Header + Fields)
4-7	uint32	Unknown (1, 2, 4, 7, or 8)

Data Block Fields

Following the bytes of the Data Block Header, the fields inside the Data Block are parsed contiguously as normal.

The last field of the Data Block fields is Field Type 0. Field Type 0, Field Len 8 signifies End Of Data Block. This field is only a Field Header–the length of 8 bytes only allows for the length of a Field Header.

Data Block Footer

The data after this Field Type 0 until the end of the Data Block is the Data Block Footer.

The footer is a summary of information about the fields seen in this Data Block. It is composed of groups of 14 bytes. Each group summarizes information on a particular Field Type. The groups are in the following format:

Data Block Footer

Bytes	Type	Description
0-1	uint16	Item 0 Field Type
2-5	uint32	Item 0 Num. Occurrences A
6-9	uint32	Item 0 Num. Occurrences B
10-13	uint32	Item 0 Unknown
14-15	uint16	Item 1 Field Type
…	…	…

“Occurrences A” and “Occurrences B” sum to the total number of occurrences of the Field Type in the Data Block. They must refer to different types of occurrences, but in which way is unknown.

The Unknown field may be (?) the number of times a given Field Type has been referenced in the Data Block.