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AX = 4405h BL = drive number (00h = default, 01h = A:, etc) (BH = 0???) CX = 000Ch (size of SuperStor packet structure) DS:DX -> SuperStor packet structure (see #04114)
Return:
CF clear if IOCTL successful -- check SuperStor packet for actual status AX = number of bytes actually transferred??? CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Note: This function is called with CX = 0008h for command 06h by NWCACHE although the Request Packet can be larger. WINSWAP.SYS calls it with 000Ch - also for command 06h.
Format of SuperStor packet: Offset Size Description (Table 04114) 00h WORD (call) product signature AA55h (ret) result code, 0000h if successful 02h BYTE (call) SuperStor product ID (01h) 03h BYTE (call) SuperStor command parameter: 06h = get compressed drive structure / drive parameters 07h = return the compressed length of a file 08h = return real drive ID for swapped drive 09h = validate the contents of the cluster 0Bh = checks whether deleted cluster is free 0Ch = reallocate previously deleted cluster 0Dh = read absolute sector from the drive 0Eh = write absolute sector to the drive 0Fh = instruct the driver to rebuild tables 10h = flush any cached Replacement Block Table (RBT) sectors to the drive ---command 06h--- 04h DWORD (ret) pointer to SuperStor CVF's compressed unit structure (see #04115) 08h DWORD (ret) pointer to internal status structure ---command 07h--- 04h DWORD (ret) size of file in bytes 08h WORD (ret) first cluster number ---command 08h--- 04h BYTE (ret) swapped drive (0-based) ---commands 09h,0Bh,0Ch--- 04h WORD (call) cluster ---commands 0Dh,0Eh--- 04h DWORD (call) first logical sector to transfer 08h WORD (call) number of logical sectors to transfer 0Ah DWORD (call) pointer to buffer ---command 0Fh--- 04h WORD (call) temporary buffer area ---command 10h--- no additional parameters
Format of SuperStor CVF compressed unit structure: Offset Size Description (Table 04115) 00h 31 BYTEs BIOS parameter block for compressed drive (see #01663) 1Fh 5 BYTEs reserved for future expansion of the BPB 24h 33 BYTEs DOS 4-6 style drive parameter block for compressed drive (see #01395) 45h 2 BYTEs reserved for future expansion of the DPB 47h WORD first sector of relocation table (RBT) 49h WORD first sector of file allocation table 4Bh WORD first sector of the data area 4Dh BYTE sec2byteshift 4Eh 2 BYTEs ???
Note: Reportedly these two bytes did not exist in ADDSTOR's specification, so the whole structure would have been documented differently. 50h WORD sectors per cluster 52h BYTE sector shift 53h WORD compression ratio 55h DWORD number of physical sectors in the host file 59h WORD OS version 5Bh BYTE SuperStor level 5Ch BYTE unknown??? 5Dh BYTE flags
bits 7-1:
???bit 0:
Drive is mounted 5Eh BYTE unknown??? 5Fh DWORD pointer to CVF's underlaying host DCB this should be the physical DPB for this unit -> +00h BYTE host unit DOS unit number +01h BYTE CVF's driver host subunit number
Note: As this SuperStor compressed unit structure's structure is located within the segment the SuperStor driver has occupied, the segment value of its address can be used as an installation check, since it contains the signature "ADDSTOR" at offset 20h in the SuperStor driver. This is used by Novell DOS 7 WINSWAP.SYS to check for the presence of SuperStor.
See Also: #04114
Index:
Installation check;SuperStor
Category: Uncatagorized - Int 21h - S
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