FSPXI:ReadFileSHA256: Difference between revisions
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| 1 | | 1 | ||
| File | | File handle lower word | ||
|- | |- | ||
| 2 | | 2 | ||
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| 5 | | 5 | ||
| Size of | | Size of read buffer | ||
|- | |- | ||
| 6 | | 6 | ||
| Line 27: | Line 27: | ||
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| 7 | | 7 | ||
| Size of | | Size of hashtable | ||
|- | |- | ||
| 8 | | 8 | ||
| (size of | | (size of hashtable << 8) <nowiki>|</nowiki> 4 | ||
|- | |- | ||
| 9 | | 9 | ||
| Pointer to | | Pointer to hashtable | ||
|- | |- | ||
| 10 | | 10 | ||
| (size of | | (size of read buffer << 8) <nowiki>|</nowiki> 0x14 | ||
|- | |- | ||
| 11 | | 11 | ||
| Pointer to | | Pointer to read buffer | ||
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The data read are stored in the | 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. | |||
Revision as of 15:36, 28 March 2015
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.