mirror of
https://github.com/Tolik-Trek/Estex-DSS.git
synced 2026-06-15 09:21:47 +03:00
186 lines
2.9 KiB
NASM
186 lines
2.9 KiB
NASM
; HL - BUFFER ADDRESS
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; DE - BLOCK SIZE
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; A - FM
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READ: LD (.R_POINT),HL
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LD (.S_POINT),HL
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CALL SET_FM
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RET C
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CALL .TEST_SIZE
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;
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LD A,D
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OR E
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JP Z,.NOREAD
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;
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PUSH DE
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LD A,(IY+_sFM.DRIVE)
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CALL OPENDSK
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JP C,.ERR_1
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CALL GET_OFFSET_IN_SECTORS
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; ;<3B> áçñâ á¬¥é¥¨ï ¢ ᥪâ®à å ;!HARDCODE sector size
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; LD H,0 ;!HARDCODE max file size = 8 gb
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; LD E,(IY+_sFM.F_POSITION+1)
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; LD D,(IY+_sFM.F_POSITION+2)
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; LD L,(IY+_sFM.F_POSITION+3)
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; LD A,E
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; AND #01
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; LD B,A
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; LD C,(IY+_sFM.F_POSITION)
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; RR L
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; RR D
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; RR E
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; ;HL:DE FP (in sectors)
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; ;BC FP residue (in bytes)
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; ;
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; OR C
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JP NZ,.ROV1
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.ROV4: POP BC
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PUSH BC
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SRL B
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JR Z,.ROV2
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LD (.SECTORH),HL
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LD (.SECTORL),DE
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.R_POINT+2: LD IX,0
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CALL BLOCK_READ
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JP C,.ERR_1
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LD DE,(.R_POINT)
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.PointerOnBuffer+1:
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LD HL,0 // LD HL,(READMEM)
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AND A
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SBC HL,DE
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LD C,H
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LD B,0
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ADD HL,DE
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LD (.R_POINT),HL
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SRL C
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.SECTORL+1: LD HL,0 // LD HL,(SECTORL)
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ADD HL,BC
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EX DE,HL
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.SECTORH+1: LD HL,0 // LD HL,(SECTORH)
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LD C,B
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ADC HL,BC
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.ROV2: POP BC
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LD A,B
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AND #01
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LD B,A
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OR C
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JP Z,.ROV6
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PUSH BC
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LD IX,CORE_BUFFERS.BUFFER+#C000
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LD B,1
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IN A,(SLOT3)
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PUSH AF
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IN A,(SLOT0)
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OUT (SLOT3),A
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CALL BLOCK_READ
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POP BC
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LD C,SLOT3
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OUT (C),B
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JP C,.ERR_1
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LD HL,CORE_BUFFERS.BUFFER
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LD DE,(.R_POINT)
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POP BC
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LDIR
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LD (.R_POINT),DE
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.ROV6: LD HL,(.R_POINT)
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.S_POINT+1: LD DE,0
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;EX DE,HL
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AND A
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SBC HL,DE
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PUSH HL
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EX DE,HL
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LD XH,D
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LD XL,E
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LD HL,0
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CALL MOVE_FP.F_current
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POP DE
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.NOREAD: ;
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.COD+1: LD A,0
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OR A
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RET
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;
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.ROV1: PUSH BC
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PUSH HL
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PUSH DE
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LD IX,CORE_BUFFERS.BUFFER+#C000
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LD B,1
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IN A,(SLOT3)
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PUSH AF
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IN A,(SLOT0)
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OUT (SLOT3),A
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CALL BLOCK_READ
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POP BC
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LD C,SLOT3
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OUT (C),B
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POP HL
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JP C,.ERR_3
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; inc HL:DE
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LD BC,1
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ADD HL,BC
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EX DE,HL
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POP HL
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LD C,B
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ADC HL,BC
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;
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EXX
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POP DE
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LD HL,512 ;!HARDCODE sector size!
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AND A
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SBC HL,DE
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LD B,H
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LD C,L
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POP HL
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AND A
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SBC HL,BC
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JR NC,.ROV3
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ADD HL,BC
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LD B,H
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LD C,L
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LD HL,0 ;!TODO ¬®¦® âãâ ã¯à®áâ¨âì ¤ «ì¥©èãî ¢¥âªã?
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.ROV3: PUSH HL
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LD HL,CORE_BUFFERS.BUFFER
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ADD HL,DE
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LD DE,(.R_POINT)
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LDIR
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LD (.R_POINT),DE
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EXX
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JP .ROV4
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;
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.ERR_3: POP HL
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POP HL
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.ERR_1: POP BC
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;SCF
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RET
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;
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.TEST_SIZE: XOR A
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LD (READ.COD),A
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LD L,(IY+_sFM.F_POSITION) ;FP LOW
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LD H,(IY+_sFM.F_POSITION+1)
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ADD HL,DE
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;
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EXX
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;LD DE,0 ;!TEST
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LD L,(IY+_sFM.F_POSITION+2) ;FP HIGH
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LD H,(IY+_sFM.F_POSITION+3)
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;!TEST
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JR NC,.no_inc_hl
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INC HL
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;ADC HL,DE
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;
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.no_inc_hl: EXX ;HL':HL - NEW FP
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;
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LD C,(IY+_sFM.FS_REC.F_SIZE)
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LD B,(IY+_sFM.FS_REC.F_SIZE+1) ;SIZE LOW
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AND A
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SBC HL,BC
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EXX
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LD C,(IY+_sFM.FS_REC.F_SIZE+2) ;SIZE HIGH
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LD B,(IY+_sFM.FS_REC.F_SIZE+3)
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SBC HL,BC
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EXX
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RET C ;OK READ ALL
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EX DE,HL
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SBC HL,DE ;VERY BIG
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EX DE,HL
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LD A,#FF
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LD (READ.COD),A
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RET |