FSPXI:ReadFileSHA256

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Request[edit]

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[edit]

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.