View source for FSPXI:ReadFileSHA256

=Request=
{| class="wikitable" border="1"
|-
!  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
| Alignment size (always 0x00001000)
|-
| 7
| Size of hashtable
|-
| 8
| (size of hashtable << 8)  <nowiki>|</nowiki> 6
|-
| 9
| Pointer to hashtable
|-
| 10
| (size of read buffer << 8)  <nowiki>|</nowiki> 0x14
|-
| 11
| Pointer to read buffer
|}

=Response=
{| class="wikitable" border="1"
|-
!  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.