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FMTUNIT.PAS
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FMTUNIT.PAS
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{/////////////////////////////////////////////////////////////////////////
//
// Dos Navigator Version 1.51 Copyright (C) 1991-99 RIT Research Labs
//
// This programs is free for commercial and non-commercial use as long as
// the following conditions are aheared to.
//
// Copyright remains RIT Research Labs, and as such any Copyright notices
// in the code are not to be removed. If this package is used in a
// product, RIT Research Labs should be given attribution as the RIT Research
// Labs of the parts of the library used. This can be in the form of a textual
// message at program startup or in documentation (online or textual)
// provided with the package.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. All advertising materials mentioning features or use of this software
// must display the following acknowledgement:
// "Based on Dos Navigator by RIT Research Labs."
//
// THIS SOFTWARE IS PROVIDED BY RIT RESEARCH LABS "AS IS" AND ANY EXPRESS
// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The licence and distribution terms for any publically available
// version or derivative of this code cannot be changed. i.e. this code
// cannot simply be copied and put under another distribution licence
// (including the GNU Public Licence).
//
//////////////////////////////////////////////////////////////////////////}
Unit FmtUnit;
Interface
const
DetectDrive : Boolean = True;
SystemDisk : Boolean = False;
Uncondition : Boolean = False;
Interleave : Byte = 1;
TCylinders : Byte = 80;
SecPerT : Byte = 15;
CurDrive : Byte = 0;
FormatMode : Byte = 0;
type
PArrOfByte = ^TArrOfByte;
TArrOfByte = array[0..65000] of byte;
PParaType = ^TParaType;
TParaType = array[0..10] of Byte;
BPBType = record
BPerSect : Word;
ClustSize : Byte;
ReservdSec : Word;
FATCount : Byte;
RootSize : Word;
TotalSec : Word;
Media : Byte;
FATSize : Word;
SecPerTrk : Word;
Heads : Word;
HiddenSec : LongInt;
Reserved : array[0..9] of Byte;
Length : Byte;
end;
IOCTLPacket = record
SpecFunc : Byte;
DeviceType : Byte;
DeviceAttr : Word;
NumOfCyl : Word;
MediaType : Byte;
DeviceBPB : BPBType;
end;
SecDescript = record
C,H,N,S : Byte;
end;
AllDescript = array[1..25] of SecDescript;
var IOCTL : IOCTLPacket;
BadSp,SysSp,FreeSp : Word;
Cylinder,NumOfDrives,Side,
MediaDescr,DriveType,
SecPerFAT,SecPerCluster,
RootEntries,IOError : Byte;
SerialNo : LongInt;
SecDescr : ^AllDescript;
Old1E : Pointer;
dFAT : PArrOfByte;
VolumeLabel : String[11];
Procedure BOOTsector;
Procedure GetIOCTL;
Function PrepareFormat : Boolean;
Procedure EndFormat;
Procedure ReadSector (SecNo : Word; var Buf);
Procedure WriteSector(SecNo : Word; var Buf);
Procedure FormatTrack;
Procedure VerifyTrack;
Function Verify(SectNo : Byte) : Boolean;
Implementation
uses Dos;
const
Para08 : TParaType =($DF,$02,$25,$02,08,$02,$FF,$58,$DA,$0F,$08);
Para09 : TParaType =($DF,$02,$25,$02,09,$02,$FF,$50,$DA,$0F,$08);
Para10 : TParaType =($DF,$02,$25,$02,10,$02,$FF,$2E,$DA,$0F,$08);
Para11 : TParaType =($DF,$02,$25,$02,11,$02,$FF,$02,$DA,$0F,$08);
Para15 : TParaType =($DF,$02,$25,$02,15,$02,$FF,$54,$DA,$0F,$08);
Para17 : TParaType =($DF,$02,$25,$02,17,$02,$FF,$23,$DA,$0F,$08);
Para18 : TParaType =($DF,$02,$25,$02,18,$02,$FF,$6C,$DA,$0F,$08);
Para20 : TParaType =($DF,$02,$25,$02,20,$02,$FF,$2A,$DA,$0F,$08);
Para21 : TParaType =($DF,$02,$25,$02,21,$02,$FF,$0C,$DA,$0F,$08);
Para22 : TParaType =($DF,$02,$25,$02,22,$02,$FF,$01,$DA,$0F,$08);
var DPB : TParaType;
Procedure BOOTsector; assembler;
asm db 235, 60,144, 68, 78, 32, 49, 46, 48, 32, 32, 0, 2, 0, 1, 0
db 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0
db 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 32, 32, 32, 32, 32
db 32, 32, 32, 32, 32, 32, 70, 65, 84, 49, 50, 32, 32, 32,250, 51
db 192,142,208,188, 0,124, 22, 7,187,120, 0, 54,197, 55, 30, 86
db 22, 83,191, 62,124,185, 11, 0,252,243,164, 6, 31,198, 69,254
db 15,139, 14, 24,124,136, 77,249,137, 71, 2,199, 7, 62,124,251
db 205, 19,114,121, 51,192, 57, 6, 19,124,116, 8,139, 14, 19,124
db 137, 14, 32,124,160, 16,124,247, 38, 22,124, 3, 6, 28,124, 19
db 22, 30,124, 3, 6, 14,124,131,210, 0,163, 80,124,137, 22, 82
db 124,163, 73,124,137, 22, 75,124,184, 32, 0,247, 38, 17,124,139
db 30, 11,124, 3,195, 72,247,243, 1, 6, 73,124,131, 22, 75,124
db 0,187, 0, 5,139, 22, 82,124,161, 80,124,232,146, 0,114, 29
db 176, 1,232,172, 0,114, 22,139,251,185, 11, 0,190,230,125,243
db 166,117, 10,141,127, 32,185, 11, 0,243,166,116, 24,190,158,125
db 232, 95, 0, 51,192,205, 22, 94, 31,143, 4,143, 68, 2,205, 25
db 88, 88, 88,235,232,139, 71, 26, 72, 72,138, 30, 13,124, 50,255
db 247,227, 3, 6, 73,124, 19, 22, 75,124,187, 0, 7,185, 3, 0
db 80, 82, 81,232, 58, 0,114,216,176, 1,232, 84, 0, 89, 90, 88
db 114,187, 5, 1, 0,131,210, 0, 3, 30, 11,124,226,226,138, 46
db 21,124,138, 22, 36,124,139, 30, 73,124,161, 75,124,234, 0, 0
db 112, 0,172, 10,192,116, 41,180, 14,187, 7, 0,205, 16,235,242
db 59, 22, 24,124,115, 25,247, 54, 24,124,254,194,136, 22, 79,124
db 51,210,247, 54, 26,124,136, 22, 37,124,163, 77,124,248,195,249
db 195,180, 2,139, 22, 77,124,177, 6,210,230, 10, 54, 79,124,139
db 202,134,233,138, 22, 36,124,138, 54, 37,124,205, 19,195, 13, 10
db 78,111,110, 45, 83,121,115,116,101,109, 32,100,105,115,107, 32
db 111,114, 32,100,105,115,107, 32,101,114,114,111,114, 13, 10, 82
db 101,112,108, 97, 99,101, 32, 97,110,100, 32,112,114,101,115,115
db 32, 97,110,121, 32,107,101,121, 32,119,104,101,110, 32,114,101
db 97,100,121, 13, 10, 0, 73, 79, 32, 32, 32, 32, 32, 32, 83, 89
db 83, 77, 83, 68, 79, 83, 32, 32, 32, 83, 89, 83, 0, 0, 85,170
end;
Procedure GetIOCTL; assembler;
asm mov ax,$440D
mov cx,$0860
mov bl,CurDrive
inc bl
mov bh,0
lea dx,IOCTL
mov byte ptr IOCTL,0
mov IOCTL.SpecFunc,0
int $21
jnc @Exit
mov IOError,al
@Exit:
end;
Procedure CheckDStep; assembler;
asm push ax
xor ax,ax
mov es,ax
mov al,CurDrive
mov ah,0
mov si,ax
or byte ptr es:[490h+si],$10
cmp DriveType,1
je @Check
cmp DriveType,7
jne @Exit
@Check: cmp TCylinders,43
ja @Reset
@Set: or byte ptr es:[490h+si],$20
jmp @Exit
@Reset: and byte ptr es:[490h+si],not $20
@Exit: pop ax
end;
Procedure ReadSector; assembler;
asm mov ax,SecNo
div byte ptr SecPerT
mov dh,0
shr al,1
jnc @NoChg
inc dh
@NoChg: mov cl,ah
inc cl
mov ch,al
call CheckDStep
mov dl,CurDrive
mov ax,$0201
les bx,Buf
int $13
jc @Exit
xor ah,ah
@Exit: mov IOError,ah
end;
Procedure WriteSector; assembler;
asm mov ax,SecNo
div byte ptr SecPerT
mov dh,0
shr al,1
jnc @NoChg
inc dh
@NoChg: mov cl,ah
inc cl
mov ch,al
call CheckDStep
mov dl,CurDrive
mov ax,$0301
les bx,Buf
int $13
jc @Exit
xor ah,ah
@Exit: mov IOError,ah
end;
Procedure SetDrive(MediaByte,Parm : Byte);
begin
asm mov ah,17;mov dl,CurDrive;mov al,Parm; int $13;end;
mem[0:$490+CurDrive]:=MediaByte;
end;
Function PrepareFormat : Boolean;
label BadPar;
var i,j,k : Byte;
p : PArrOfByte;
w1,w2 : Byte;
begin
PrepareFormat:=False;IOError:=0;SecDescr:=NIL;
SecPerCluster:=1+Byte(TCylinders<44);
GetIOCTL;DriveType:=IOCTL.DeviceType;
if FormatMode=2 then
begin
SetIntVec($1E, Old1E); GetMem(p,512); FillChar(p^,512,1);
ReadSector(SecPerT*2,p^); ReadSector(0,p^);
w1:=SecPerT;w2:=TCylinders;
if IOError=0 then
begin
SecPerT:=p^[$18];SecPerCluster:=p^[$0D];
TCylinders:=(p^[$13] or Word(p^[$14]) shl 8) div p^[$1A] div SecPerT;
SecPerFAT:=(((TCylinders*SecPerT*2 div SecPerCluster)*3 div 2)+511) div 512;
end;
if (IOError>0) or ((p^[$B] or Word(p^[$C]) shl 8)<>$200)
or (p^[$10]<>2) or (p^[$1A]<>2) or ((p^[$16]
or Word(p^[$17]) shl 8)<>SecPerFAT) or (p^[$E]<>1) or
(TCylinders>85) then begin
SecPerT:=w1;TCylinders:=w2;
FreeMem(p,512);Exit;
end;
FreeMem(p,512);
end;
if DetectDrive and (TCylinders>43) then
if (IOCTL.DeviceType=0) or (TCylinders>85) then Exit;
if (Interleave>=SecPerT) or (Interleave=0) then Exit;
PrepareFormat:=True;
New(SecDescr);j:=1;
SecPerFAT:=(((TCylinders*SecPerT*2 div SecPerCluster)*3 div 2)+511) div 512;
FillChar(SecDescr^,SizeOf(SecDescr^),0);
for i:=1 to SecPerT do
begin
While (SecDescr^[j].N<>0) or (j>SecPerT) do
begin Inc(j);if j>SecPerT then j:=1;end;
SecDescr^[j].N:=i; SecDescr^[i].S:=2;
Inc(j,Interleave);
end;
DPB[0]:=0;
case SecPerT of
8 : DPB:=Para08;
9 : DPB:=Para09;
10 : DPB:=Para10;
11 : if DriveType<>7 then Goto BadPar else DPB:=Para11;
12..16 : DPB:=Para15;
17 : DPB:=Para17;
18,19 : case IOCTL.DeviceType of
1 : begin PrepareFormat:=False;EndFormat;Exit;end;
7 : DPB:=Para18;
end;
20 : if DriveType<>7 then Goto BadPar else DPB:=Para20;
21 : if DriveType<>7 then Goto BadPar else DPB:=Para21;
22 : if DriveType<>7 then Goto BadPar else DPB:=Para22;
else begin
BadPar: PrepareFormat:=False;EndFormat;Exit;
end;
end;
if DPB[0]<>0 then SetIntVec($1E, @DPB);
case SecPerT of
8 : MediaDescr:=$FF;
9 : MediaDescr:=$FD;
15 : MediaDescr:=$F9;
else MediaDescr:=$F0;
end;
if TCylinders>43 then RootEntries:=224 else RootEntries:=112;
case DriveType of
0: SetDrive($53,1);
1: if (TCylinders>43) and (SecPerT>11)
then SetDrive($15,3)
else if (TCylinders>43) and (SecPerT<12)
then SetDrive($53,5)
else if SecPerT<12
then SetDrive($73,2)
else SetDrive($34,2);
2: if (TCylinders>43)
then SetDrive($97,4)
else SetDrive($B7,2);
7: if (TCylinders>43) and (SecPerT>11)
then SetDrive($14,3)
else if (TCylinders>43) and (SecPerT<12)
then SetDrive($97,5)
else if SecPerT<12
then SetDrive($B7,2)
else SetDrive($34,3);
end;
asm mov ah,0; mov dl,CurDrive; int $13;end;
if FormatMode=2 then Exit;FormatMode:=0;
if Uncondition then Exit;
Side:=1;Cylinder:=TCylinders-3 or 1;VerifyTrack;
Side:=0;Cylinder:=0;if IOError<>0 then Exit;
VerifyTrack;if IOError<>0 then Exit;
Inc(SecPerT);VerifyTrack;Dec(SecPerT);
if IOError<>0 then FormatMode:=1;
end;
Procedure EndFormat;
begin
if SecDescr<>NIL then Dispose(SecDescr);
SetIntVec($1E, Old1E); SecDescr:=NIL;
asm mov ah, 0h;
mov dl, CurDrive;
int 13h
mov ah, 17h
mov al, 0
mov dl, CurDrive
int 13h
end;
end;
Procedure FormatTrack; assembler;
asm call CheckDStep
mov cx,22
les di,SecDescr
mov al,Cylinder
mov ah,Side
cld
@NextSec:stosw
add di,2
loop @NextSec
xor ax,ax
mov es,ax
les bx,es:[$78]
mov al,SecPerT
mov byte ptr es:[bx+4],al
mov ah,5
mov dl,CurDrive
mov dh,Side
mov ch,Cylinder
les bx,SecDescr
int $13
jc @Exit
xor ah,ah
@Exit: mov IOError,ah
end;
Function Verify; assembler;
asm call CheckDStep
mov ax,$0401
mov dl,CurDrive
mov dh,Side
mov ch,Cylinder
mov cl,SectNo
int $13
mov al,0
jnc @Ex
inc al
@Ex:
end;
Procedure VerifyTrack; assembler;
asm call CheckDStep
mov ah,4
mov al,SecPerT
mov dl,CurDrive
mov dh,Side
mov ch,Cylinder
mov cl,1
int $13
jc @Ex
mov ah,0
@Ex: mov IOError,ah
end;
begin
if mem[$40:$10] and 1>0 then NumOfDrives:=mem[$40:$10] shr 6+1
else NumOfDrives:=0;
GetIntVec($1E, Old1E); VolumeLabel:='';
end.