FSPXI:WriteFileSHA256

Request

Index Word	Description
0	Header code [0x004E0204]
1	File handle lower word
2	File handle upper word
3	Offset lower word
4	Offset upper word
5	Size of write buffer
6	Alignment size (always 0x00001000)
7	Size of hashtable
8	Flush flags
9	(size of hashtable << 8) | 6
10	Pointer to hashtable
11	(size of write buffer << 8) | 0x14
12	Pointer to write buffer

Response

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

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

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