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224 lines
8.8 KiB
224 lines
8.8 KiB
;----------------------------------------------------------------------------
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; MDEQU.INC - General equate file
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;
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; Microsoft Confidential
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; Copyright (C) Microsoft Corporation 1992-1993
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; All Rights Reserved.
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;
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; History:
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; 20-Jul-92 chuckst Initial version.
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;
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; VxD History:
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; 21-Apr-93 jeffpar Adapted for MRCI.386
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;----------------------------------------------------------------------------
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; Define the following variable to generate the standalone
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; version of DBLSPACE.BIN, which loads as a device driver under
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; MS-DOS 5.0 or greater.
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;
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;STANDALONE equ 0ffffh
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; Note that the final version of DblSpace switched to 6-8-12 encoding
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; which assumes the following scheme:
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;
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; ccccccc10 raw char ( < 128)
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; ccccccc01 raw char ( >=128)
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; oooooo00 6-bit offset
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; oooooooo011 8-bit offset
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; oooooooooooo111 12-bit offset
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;
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MAX_6BIT_OFFSET equ 63
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MAX_8BIT_OFFSET equ (MAX_6BIT_OFFSET+256)
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MAX_12BIT_OFFSET equ ((MAX_8BIT_OFFSET+4096)-1)
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SPECIAL_EOS equ 4415 ;End of Sector code
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.errnz MAX_12BIT_OFFSET+1 ne SPECIAL_EOS
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MAX_LENGTH_BITS equ 17
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MAX_TRUE_LENGTH equ 512
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MAX_RAW_LENGTH equ (MAX_TRUE_LENGTH-2) ; lengths are stored 2 less than true length
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fatal_error_0 equ 0 ; re-entered at strat
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fatal_error_1 equ 1 ; irpt without 1 strat
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fatal_error_2 equ 2 ; 2 irpts per strat
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fatal_error_3 equ 3 ; get_sqztor, number too low
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fatal_error_4 equ 4 ; put_sqztor, number too low
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fatal_error_5 equ 5 ; get_sqztor, number too high
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fatal_error_6 equ 6 ; put_sqztor, number too high
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fatal_error_7 equ 7 ; DOS system I/O too high
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fatal_error_8 equ 8 ; DOS system I/O too low
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fatal_error_9 equ 9 ; HEAP I/O too high
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fatal_error_10 equ 10 ; HEAP I/O too low
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fatal_error_11 equ 11 ; BITFAT I/O too high
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fatal_error_12 equ 12 ; BITFAT I/O too low
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fatal_error_13 equ 13 ; MDFAT I/O too high
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fatal_error_14 equ 14 ; MDFAT I/O too low
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fatal_error_15 equ 15 ; Bad signature check on CVF fragment list
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fatal_error_16 equ 16 ; Invalid int2f subfn (for forcing popup)
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fatal_error_17 equ 17 ; free to free sqztor
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fatal_error_18 equ 18 ; unfree to used sqztor
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;;
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;; Equates
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;;
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multMagicdrv equ 4a11h ; Int2f multiplex number
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DRVMAP_CPR_BIT equ 80h ; bit indicating mounted CVF in drv_map array
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cr = 13
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lf = 10
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tab = 9
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ctrlz = 1ah
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CVF_SEQ_SWAP equ 0 ; Sequence number which implies SWAP
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CVF_SEQ_MAX equ 255 ; Maximum allowable sequence number
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MAX_ACTIVATES equ 24 ; 26 drive letters, less two floppies
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BIG_CLUSTER equ 8192 ;Size of BIG cluster (8K)
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SMALL_CLUSTER equ 4096 ;Size of SMALL cluster (4K)
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BPTR equ BYTE PTR
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MAX_FULL equ 32 ;;64;Minimum of free sectors b4 we declare this disk as full
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MAX_WARN equ 256 ;Minimum free sectors to generate an 'almost full' warning
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;; temp_buf_list values
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ORIGINAL_DATA equ 1 ;This sector has an original data
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NEW_DATA equ 2 ;This sector contains new data
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MAX_DEMO_HIWORD_SIZE equ 48 ;Maximum high word for demo file
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MAX_SECTOR_SIZE equ 2048 ;Maximum host sector size (2K)
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IO_PART_SPACE equ 2048 ;Page size for sqztor table
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PART_CLUSTER_SIZE_POW2 equ 9 ;How many clusters per one page (DWORD per cluster)
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BIT_FAT_SPACE equ 2048 ;Page size of sec_list table (free space)
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SECTORS_PER_BIT_FAT_POW2 equ 14 ;In power 2 if sectors
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SECTORS_PER_BIT_FAT equ 16384 ;Number of bits (sectors) in one page
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;BPB equates
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DBL_SIGN equ 512 ;Where the 'DBL' signature can be located
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RETRACT_SIGNATURE equ 1 ; signature is last full sector, ie:
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; ; end of file (rounded down to sector)
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; ; minus 1
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RH equ ds:[bx] ;Addressability to Request Header structure
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MAX_DISK_UNITS equ 15 ;Maximumm of extended disk we can handle
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cMINFILEFRAGMENTS equ 50 ;Minimum file fragment heap size
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cDEFFILEFRAGMENTS equ 700 ;Default " " " "
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cMAXFILEFRAGMENTS equ 10000 ;Maximum " " " "
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; cluster_to_Sqztor equates. See globals definition
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NO_FLAGS_MASK equ 001FH ;Just the entry, without flags
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RESERVED1_MASK equ 0020H ;Reserved bit just after 21-bit sector#
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PHYSICAL_SIZE_MASK equ 03C0H ;Only the physical size bits
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PHYSICAL_SIZE_OFFSET equ 6 ;THe physical size bits offset
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PLAINTEXT_MASK equ 3C00H ;Only the plaintext size bits
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PLAINTEXT_OFFSET equ 10 ;Plaintext size bits offset
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UNCODED_CLUSTER_MASK equ 4000H ;Uncompress cluster bit
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USED_CLUSTER_MASK equ 8000H ;Used cluster bit
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PARA_SIZE_POW2 equ 4 ;Number of bytes in one 8088 paragraph
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STACK_SIZE equ 768 ;Size of our stack
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; Device driver equates
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READ_DISK_CMD equ 4
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WRITE_DISK_CMD equ 8
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STAT_WRITP equ 8000H ;Write protect violation
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STAT_DFULL equ 8027h ;Disk full error
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STAT_NRDY equ 8002H ;Device not ready
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STAT_NOCOM equ 8003H ;Unkown command
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STAT_CRC equ 8004H ;CRC error
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STAT_SNF equ 8008H ;sector not found error
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STAT_SEEK equ 8006H ;Seek error
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STAT_WRITE equ 800AH ;Write FAULT
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STAT_READ equ 800BH ;Read fault
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STAT_GEN equ 800CH ;General failore
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DOS EQU 21H ;DOS request INT
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DOS_PCHR EQU 02H ;print character function
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;Constants for compression/Decompression alg.
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MAX_BITS equ 12 ;Maximum bits (2048 entries)
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TABLESIZE equ 2048 ;Hash table size
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shCHUNK equ 9
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cbCHUNK equ (1 shl shCHUNK) ; size of a 'chunk'
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.errnz cbCHUNK ne 512
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cbLONGCOPY equ 32 ; do extra checking for string copies >= this
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;Generic IOCTL return codes
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NO_ERROR equ 0 ;No error
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LETTER_BOUNDRY_ERROR equ 1 ;Letter out of bounds
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UNIT_USED_ERROR equ 2 ;Unit already used
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NO_FREE_SLOT_ERROR equ 3 ;No reserved slot available
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STAMP_ERROR equ 4 ;Stamp error on extended disk
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;Cluster signature
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;Compressed clusters has the signature:
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; 44 53 00 00 - Cluster compressed real time
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; 44 53 00 01 - Cluster SuperCompressed offline
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; 44 53 00 02 - Cluster XCompressed real time
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;
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; NOTE: If you load these signature as words, they look like:
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;
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; low word = 5344h
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; high word = 0000h or 0100h
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; XCMP defines a different REAL_TIME_COMPRESSED signature so a XCMP and
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; non XCMP driver can be used on the same CVF and not get confused trying
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; to UpdateCompress a XCMP block (XCMP does not support UpdateCompress).
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SIG_SIZE equ 4 ; 4 byte signature
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STANDARD_COMPRESSED equ 0000h ; High word of stamp
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SUPER_COMPRESSED equ 0100h ; High word of stamp
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X_COMPRESSED equ 0200h ; High word of stamp
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REAL_TIME_COMPRESSED equ X_COMPRESSED ; Stamp used for real-time compress
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;;
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;; We always keep at least 64k of extra sqztors around so a
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;; file overwrite won't expand to more sqztors that are available.
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;; Of course this is a raw heuristic since these should also
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;; be contingous. For more info, see dospatch.asm and
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;; low_dlb.asm referenece to FUDGESTOR
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FUDGESTOR equ 128
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; eXperimental compression code uses a lookup table to find past
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; occurances of individual characters. The table is currently
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; 256 rows (1 for each possible byte value) X N (tracks N occurances
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; of each character).
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cltROWS EQU 256 ; lookup table 256 rows x
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cltCOLS EQU 8 ; N columns
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;
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; The following basic structures were moved from MDSTRUC.INC to
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; eliminate the need to include MDSTRUC.INC except where necessary;
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; MDSTRUC.INC is primarily disk-management structures that are of no
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; interest to MRCI.
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;
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;*** offst_segmt -- struc allows easy access to parts of dword pointer
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;
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offst_segmt struc
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offst dw 0
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segmt dw 0
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offst_segmt ends
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;*** loword_hiword -- struct allows easy access to words of dword
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;
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loword_hiword struc
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loword dw 0
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hiword dw 0
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loword_hiword ends
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