FSPXI:ReadFileSHA256

Request

Index Word	Description
0	Header code [0x004D01C4]
1	File handle lower word
2	File handle upper word
3	Offset lower word
4	Offset upper word
5	Size of read buffer
6	Unknown (always 0x00001000)
7	Size of hashtable
8	(size of hashtable << 8) | 4
9	Pointer to hashtable
10	(size of read buffer << 8) | 0x14
11	Pointer to read buffer

Response

Index Word	Description
0	Header code
1	Result code
2	Size read
3	4

The data read are stored in the read buffer. For each 0x1000-byte block read, a SHA256 hash of the block is stored in the hashtable.

It is unknown how hashing behaves if the read offset/size are not aligned to a 0x1000-byte boundary.