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memory.pas
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memory.pas
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{********[ SOURCE FILE OF GRAPHICAL FREE VISION ]**********}
{ }
{ System independent clone of MEMORY.PAS }
{ }
{ Interface Copyright (c) 1992 Borland International }
{ }
{ Copyright (c) 1996, 1997, 1998, 1999 by Leon de Boer }
{ [email protected] - primary e-mail address }
{ [email protected] - backup e-mail address }
{ }
{****************[ THIS CODE IS FREEWARE ]*****************}
{ }
{ This sourcecode is released for the purpose to }
{ promote the pascal language on all platforms. You may }
{ redistribute it and/or modify with the following }
{ DISCLAIMER. }
{ }
{ This SOURCE CODE is distributed "AS IS" WITHOUT }
{ WARRANTIES AS TO PERFORMANCE OF MERCHANTABILITY OR }
{ ANY OTHER WARRANTIES WHETHER EXPRESSED OR IMPLIED. }
{ }
{*****************[ SUPPORTED PLATFORMS ]******************}
{ 16 and 32 Bit compilers }
{ DOS - Turbo Pascal 7.0 + (16 Bit) }
{ DPMI - Turbo Pascal 7.0 + (16 Bit) }
{ - FPC 0.9912+ (GO32V2) (32 Bit) }
{ WINDOWS - Turbo Pascal 7.0 + (16 Bit) }
{ - Delphi 1.0+ (16 Bit) }
{ WIN95/NT - Delphi 2.0+ (32 Bit) }
{ - Virtual Pascal 2.0+ (32 Bit) }
{ - Speedsoft Sybil 2.0+ (32 Bit) }
{ - FPC 0.9912+ (32 Bit) }
{ OS2 - Virtual Pascal 1.0+ (32 Bit) }
{ }
{******************[ REVISION HISTORY ]********************}
{ Version Date Fix }
{ ------- --------- --------------------------------- }
{ 1.00 19 feb 96 Initial DOS/DPMI code released. }
{ 1.10 18 Jul 97 Windows conversion added. }
{ 1.20 29 Aug 97 Platform.inc sort added. }
{ 1.30 05 May 98 Virtual pascal 2.0 code added. }
{ 1.40 01 Oct 99 Complete multiplatform rewrite }
{ 1.41 03 Nov 99 FPC Windows support added }
{**********************************************************}
UNIT Memory;
{====Include file to sort compiler platform out =====================}
{$I platform.inc}
{<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>}
INTERFACE
{<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>}
{====================================================================}
{==== Compiler directives ===========================================}
{$IFNDEF PPC_FPC}{ FPC doesn't support these switches }
{$F+} { Force far calls }
{$A+} { Word Align Data }
{$B-} { Allow short circuit boolean evaluations }
{$O+} { This unit may be overlaid }
{$G+} { 286 Code optimization - if you're on an 8088 get a real computer }
{$P-} { Normal string variables }
{$N-} { No 80x87 code generation }
{$E+} { Emulation is on }
{$ENDIF}
{$X+} { Extended syntax is ok }
{$R-} { Disable range checking }
{$S-} { Disable Stack Checking }
{$I-} { Disable IO Checking }
{$Q-} { Disable Overflow Checking }
{$V-} { Turn off strict VAR strings }
{====================================================================}
USES FVCommon;
{***************************************************************************}
{ INTERFACE ROUTINES }
{***************************************************************************}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ MEMORY ACCESS ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{-MemAlloc-----------------------------------------------------------
Allocates the requested size of memory if this takes memory free below
the safety pool then a nil pointer is returned.
01Oct99 LdB
---------------------------------------------------------------------}
FUNCTION MemAlloc (Size: Word): Pointer;
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ MEMORY MANAGER SYSTEM CONTROL ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{-LowMemory----------------------------------------------------------
Returns if the free memory left is below the safety pool value.
01Oct99 LdB
---------------------------------------------------------------------}
FUNCTION LowMemory: Boolean;
{-InitMemory---------------------------------------------------------
Initializes the memory and safety pool manager. This should be called
prior to using any of the memory manager routines.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE InitMemory;
{-DoneMemory---------------------------------------------------------
Closes the memory and safety pool manager. This should be called after
using the memory manager routines so as to clean up.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE DoneMemory;
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ CACHE MEMORY ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{-NewCache-----------------------------------------------------------
Create a new cache of given size in pointer P failure will return nil.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE NewCache (Var P: Pointer; Size: Word);
{-DisposeCache-------------------------------------------------------
Dispose of a cache buffer given by pointer P.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE DisposeCache (P: Pointer);
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ BUFFER MEMORY ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{-GetBufferSize------------------------------------------------------
Returns the size of memory buffer given by pointer P.
01Oct99 LdB
---------------------------------------------------------------------}
FUNCTION GetBufferSize (P: Pointer): Word;
{-SetBufferSize------------------------------------------------------
Change the size of buffer given by pointer P to the size requested.
01Oct99 LdB
---------------------------------------------------------------------}
FUNCTION SetBufferSize (var P: Pointer; Size: Word): Boolean;
{-DisposeBuffer------------------------------------------------------
Dispose of buffer given by pointer P.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE DisposeBuffer (P: Pointer);
{-NewBuffer----------------------------------------------------------
Create a new buffer of given size in ptr P failure will return nil.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE NewBuffer (Var P: Pointer; Size: Word);
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ DOS MEMORY CONTROL ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{-InitDosMem---------------------------------------------------------
Initialize memory manager routine for a shell to launch a DOS window.
Interface for compatability only under DPMI/WIN/NT/OS2 platforms.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE InitDosMem;
{-DoneDosMem---------------------------------------------------------
Finished shell to a DOS window so reset memory manager again.
Interface for compatability only under DPMI/WIN/NT/OS2 platforms.
01Oct99 LdB
---------------------------------------------------------------------}
PROCEDURE DoneDosMem;
{***************************************************************************}
{ PUBLIC INITIALIZED VARIABLES }
{***************************************************************************}
CONST
LowMemSize : Word = 4096 DIV 16; { 4K }
SafetyPoolSize: Word = 8192; { Safety pool size }
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
MaxHeapSize : Word = 655360 DIV 16; { 640K }
MaxBufMem : Word = 65536 DIV 16; { 64K }
{$ENDIF}
{<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>}
IMPLEMENTATION
{<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>}
{$IFDEF OS_WINDOWS} { WIN/NT CODE }
{$IFDEF PPC_FPC} { FPC WINDOWS COMPILER }
USES Windows; { Standard unit }
{$ELSE} { OTHER COMPILERS }
USES WinProcs, WinTypes; { Standard units }
{$ENDIF}
{$ENDIF}
{$IFDEF OS_OS2} { OS2 CODE }
{$IFDEF PPC_FPC}
USES DosCalls; { Standard unit }
{$ELSE}
USES Os2Base; { Standard unit }
{$ENDIF}
{$ENDIF}
{***************************************************************************}
{ PRIVATE RECORD TYPE DEFINITIONS }
{***************************************************************************}
{---------------------------------------------------------------------------}
{ TBuffer RECORD DEFINITION }
{---------------------------------------------------------------------------}
TYPE
PBuffer = ^TBuffer; { Buffer pointer }
TBuffer =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
PACKED
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
RECORD
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
Size : Word; { Buffer size }
Master: ^Word; { Master buffer }
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
Next: PBuffer; { Next buffer }
Size: Word; { Buffer size }
Data: RECORD END; { Buffer data }
{$ENDIF}
END;
{---------------------------------------------------------------------------}
{ POINTER TYPE CONVERSION RECORDS }
{---------------------------------------------------------------------------}
TYPE
PtrRec =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
PACKED
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
RECORD
Ofs, Seg: Word; { Pointer to words }
END;
{---------------------------------------------------------------------------}
{ TCache RECORD DEFINITION }
{---------------------------------------------------------------------------}
TYPE
PCache = ^TCache; { Cache pointer }
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
TCache =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
PACKED
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
RECORD
Size : Word; { Cache size }
Master: ^Pointer; { Master cache }
Data : RECORD END; { Cache data }
END;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
TCache =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
PACKED
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
RECORD
Next : PCache; { Next cache }
Master: ^Pointer; { Master cache }
Size : Word; { Size of cache }
Data : RECORD END; { Cache data }
End;
{$ENDIF}
{***************************************************************************}
{ INITIALIZED PRIVATE VARIABLES }
{***************************************************************************}
CONST
DisablePool: Boolean = False; { Disable safety pool }
SafetyPool : Pointer = Nil; { Safety pool memory }
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
HeapResult: Integer = 0; { Heap result }
BufHeapPtr: Word = 0; { Heap position }
BufHeapEnd: Word = 0; { Heap end }
CachePtr : Pointer = Nil; { Cache list }
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
CacheList : PCache = Nil; { Cache list }
BufferList: PBuffer = Nil; { Buffer list }
{$ENDIF}
{***************************************************************************}
{ PRIVATE UNIT ROUTINES }
{***************************************************************************}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ PRIVATE UNIT ROUTINES - REAL MODE DOS PLATFORMS }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
{---------------------------------------------------------------------------}
{ GetBufSize -> Platforms DOS REAL MODE - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION GetBufSize (P: PBuffer): Word; {$IFNDEF PPC_FPC}FAR;{$ENDIF}
BEGIN
GetBufSize := (P^.Size + 15) SHR 4 + 1; { Buffer paragraphs }
END;
{---------------------------------------------------------------------------}
{ FreeCacheMem -> Platforms DOS REAL MODE - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE FreeCacheMem; {$IFNDEF PPC_FPC}FAR;{$ENDIF}
BEGIN
While (CachePtr <> HeapEnd) Do
DisposeCache(CachePtr); { Release blocks }
END;
{---------------------------------------------------------------------------}
{ SetMemTop -> Platforms DOS REAL MODE - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE SetMemTop (MemTop: Pointer); ASSEMBLER;
ASM
MOV BX, MemTop.Word[0]; { Top of memory }
ADD BX, 15;
MOV CL, 4;
SHR BX, CL; { Size in paragraphs }
ADD BX, MemTop.Word[2];
MOV AX, PrefixSeg; { Add prefix seg }
SUB BX, AX;
MOV ES, AX;
MOV AH, 4AH;
INT 21H; { Call to DOS }
END;
{---------------------------------------------------------------------------}
{ MoveSeg -> Platforms DOS REAL MODE - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE MoveSeg (Source, Dest, Size: Word); NEAR; ASSEMBLER;
ASM
PUSH DS; { Save register }
MOV AX, Source;
MOV DX, Dest; { Destination }
MOV BX, Size;
CMP AX, DX; { Does Source=Dest? }
JB @@3;
CLD; { Go forward }
@@1:
MOV CX, 0FFFH;
CMP CX, BX;
JB @@2;
MOV CX, BX;
@@2:
MOV DS, AX;
MOV ES, DX;
ADD AX, CX;
ADD DX, CX;
SUB BX, CX;
SHL CX, 3; { Mult x8 }
XOR SI, SI;
XOR DI, DI;
REP MOVSW;
OR BX, BX;
JNE @@1;
JMP @@6;
@@3: { Source=Dest }
ADD AX, BX; { Hold register }
ADD DX, BX; { Must go backwards }
STD;
@@4:
MOV CX, 0FFFH;
CMP CX, BX;
JB @@5;
MOV CX, BX;
@@5:
SUB AX, CX;
SUB DX, CX;
SUB BX, CX;
MOV DS, AX;
MOV ES, DX;
SHL CX, 3; { Mult x8 }
MOV SI, CX;
DEC SI;
SHL SI, 1;
MOV DI, SI;
REP MOVSW; { Move data }
OR BX, BX;
JNE @@4;
@@6:
POP DS; { Recover register }
END;
{---------------------------------------------------------------------------}
{ SetBufSize -> Platforms DOS REAL MODE - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE SetBufSize (P: PBuffer; NewSize: Word); {$IFNDEF PPC_FPC}FAR;{$ENDIF}
VAR CurSize: Word;
BEGIN
CurSize := GetBufSize(P); { Current size }
MoveSeg(PtrRec(P).Seg + CurSize, PtrRec(P).Seg+
NewSize, BufHeapPtr - PtrRec(P).Seg - CurSize); { Move data }
Inc(BufHeapPtr, NewSize - CurSize); { Adjust heap space }
Inc(PtrRec(P).Seg, NewSize); { Adjust pointer }
While PtrRec(P).Seg < BufHeapPtr Do Begin
Inc(P^.Master^, NewSize - CurSize); { Adjust master }
Inc(PtrRec(P).Seg, (P^.Size + 15) SHR 4 + 1); { Adjust paragraphs }
End;
END;
{$ENDIF}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ PRIVATE UNIT ROUTINES - DPMI/WIN/NT/OS2 PLATFORMS }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{$IFNDEF PROC_REAL} { DPMI/WIN/NT/OS2 CODE }
{---------------------------------------------------------------------------}
{ FreeCache -> Platforms DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION FreeCache: Boolean; {$IFNDEF PPC_FPC}FAR;{$ENDIF}
BEGIN
FreeCache := False; { Preset fail }
If (CacheList <> Nil) Then Begin
DisposeCache(CacheList^.Next^.Master^); { Dispose cache }
FreeCache := True; { Return success }
End;
END;
{---------------------------------------------------------------------------}
{ FreeCache -> Platforms DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION FreeSafetyPool: Boolean; {$IFNDEF PPC_FPC}FAR;{$ENDIF}
BEGIN
FreeSafetyPool := False; { Preset fail }
If (SafetyPool <> Nil) Then Begin { Pool exists }
FreeMem(SafetyPool, SafetyPoolSize); { Release memory }
SafetyPool := Nil; { Clear pointer }
FreeSafetyPool := True; { Return true }
End;
END;
{$ENDIF}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ PRIVATE UNIT ROUTINES - ALL PLATFORMS }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ HeapNotify -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION HeapNotify (Size: Word): Integer; {$IFNDEF PPC_FPC}FAR;{$ENDIF}
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
ASSEMBLER;
ASM
CMP Size, 0; { Check for zero size }
JNE @@3; { Exit if size = zero }
@@1:
MOV AX, CachePtr.Word[2];
CMP AX, HeapPtr.Word[2]; { Compare segments }
JA @@3;
JB @@2;
MOV AX, CachePtr.Word[0];
CMP AX, HeapPtr.Word[0]; { Compare offsets }
JAE @@3;
@@2:
XOR AX, AX; { Clear register }
PUSH AX; { Push zero }
PUSH AX; { Push zero }
CALL DisposeCache; { Dispose cache }
JMP @@1;
@@3:
MOV AX, HeapResult; { Return result }
END;
{$ELSE} { DPMI/WIN/NT/OS2 }
BEGIN
If FreeCache Then HeapNotify := 2 Else { Release cache }
If DisablePool Then HeapNotify := 1 Else { Safetypool disabled }
If FreeSafetyPool Then HeapNotify := 2 Else { Free safety pool }
HeapNotify := 0; { Return success }
END;
{$ENDIF}
{***************************************************************************}
{ INTERFACE ROUTINES }
{***************************************************************************}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ MEMORY ACCESS ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ MemAlloc -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION MemAlloc (Size: Word): Pointer;
VAR P: Pointer;
BEGIN
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
HeapResult := 1; { Stop error calls }
GetMem(P, Size); { Get memory }
HeapResult := 0; { Reset error calls }
If (P <> Nil) AND LowMemory Then Begin { Low memory }
FreeMem(P, Size); { Release memory }
P := Nil; { Clear pointer }
End;
MemAlloc := P; { Return result }
{$ELSE} { DPMI/WIN/NT/OS2 }
DisablePool := True; { Disable safety }
GetMem(P, Size); { Allocate memory }
DisablePool := False; { Enable safety }
MemAlloc := P; { Return result }
{$ENDIF}
END;
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ MEMORY MANAGER SYSTEM CONTROL ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ LowMemory -> Platforms DOS/DPMI/WIN/NT/OS2 - Checked 29Jun98 LdB }
{---------------------------------------------------------------------------}
FUNCTION LowMemory: Boolean;
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
ASSEMBLER;
ASM
MOV AX, HeapEnd.Word[2]; { Get heap end }
SUB AX, HeapPtr.Word[2];
SUB AX, LowMemSize; { Subtract size }
SBB AX, AX;
NEG AX; { Return result }
END;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
BEGIN
LowMemory := False; { Preset false }
If (SafetyPool = Nil) Then Begin { Not initialized }
SafetyPool := MemAlloc(SafetyPoolSize); { Allocate safety pool }
If (SafetyPool = Nil) Then LowMemory := True; { Return if low memory }
End;
END;
{$ENDIF}
{---------------------------------------------------------------------------}
{ InitMemory -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE InitMemory;
{$IFDEF PROC_REAL} VAR HeapSize: Word; {$ENDIF}
BEGIN
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
HeapError := @HeapNotify; { Point to error proc }
If (BufHeapPtr = 0) Then Begin
HeapSize := PtrRec(HeapEnd).Seg
- PtrRec(HeapOrg).Seg; { Calculate size }
If (HeapSize > MaxHeapSize) Then
HeapSize := MaxHeapSize; { Restrict max size }
BufHeapEnd := PtrRec(HeapEnd).Seg; { Set heap end }
PtrRec(HeapEnd).Seg := PtrRec(HeapOrg).Seg
+ HeapSize; { Add heapsize }
BufHeapPtr := PtrRec(HeapEnd).Seg; { Set heap pointer }
End;
CachePtr := HeapEnd; { Cache starts at end }
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
{$IFNDEF PPC_FPC}
HeapError := @HeapNotify; { Set heap error proc }
{$ENDIF}
SafetyPoolSize := LowMemSize * 16; { Fix safety pool size }
LowMemory; { Check for low memory }
{$ENDIF}
END;
{---------------------------------------------------------------------------}
{ DoneMemory -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE DoneMemory;
BEGIN
{$IFDEF PROC_REAL} { REAl MODE DOS CODE }
FreeCacheMem; { Release cache memory }
{$ELSE} { DPMI/WIN/NT/OS2 }
While FreeCache Do; { Free cache memory }
FreeSafetyPool; { Release safety pool }
{$ENDIF}
END;
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ CACHE MEMORY ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ NewCache -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE NewCache (Var P: Pointer; Size: Word);
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
ASSEMBLER;
ASM
LES DI, P; { Addres of var P }
MOV AX, Size;
ADD AX, (TYPE TCache)+15; { Add offset }
MOV CL, 4;
SHR AX, CL;
MOV DX, CachePtr.Word[2]; { Reteive cache ptr }
SUB DX, AX;
JC @@1;
CMP DX, HeapPtr.Word[2]; { Heap ptr end }
JBE @@1;
MOV CX, HeapEnd.Word[2];
SUB CX, DX;
CMP CX, MaxBufMem; { Compare to maximum }
JA @@1;
MOV CachePtr.Word[2], DX; { Exchange ptr }
PUSH DS;
MOV DS, DX;
XOR SI, SI;
MOV DS:[SI].TCache.Size, AX; { Get cache size }
MOV DS:[SI].TCache.Master.Word[0], DI;
MOV DS:[SI].TCache.Master.Word[2], ES; { Get master ptr }
POP DS;
MOV AX, OFFSET TCache.Data;
JMP @@2;
@@1:
XOR AX, AX;
CWD; { Make double word }
@@2:
CLD;
STOSW; { Write low word }
XCHG AX, DX;
STOSW; { Write high word }
END;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
VAR Cache: PCache;
BEGIN
Inc(Size, SizeOf(TCache)); { Add cache size }
If (MaxAvail >= Size) Then GetMem(Cache, Size) { Allocate memory }
Else Cache := Nil; { Not enough memory }
If (Cache <> Nil) Then Begin { Cache is valid }
If (CacheList = Nil) Then Cache^.Next := Cache
Else Begin
Cache^.Next := CacheList^.Next; { Insert in list }
CacheList^.Next := Cache; { Complete link }
End;
CacheList := Cache; { Hold cache ptr }
Cache^.Size := Size; { Hold cache size }
Cache^.Master := @P; { Hold master ptr }
{$ifdef fpc}
Inc(Pointer(Cache), SizeOf(TCache)); { Set cache offset }
{$else fpc}
Inc(PtrRec(Cache).Ofs, SizeOf(TCache)); { Set cache offset }
{$endif fpc}
End;
P := Cache; { Return pointer }
END;
{$ENDIF}
{---------------------------------------------------------------------------}
{ DisposeCache -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE DisposeCache (P: Pointer);
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
ASSEMBLER;
ASM
MOV AX, CachePtr.Word[2]; { Cache high word }
XOR BX, BX;
XOR CX, CX;
MOV DX, P.Word[2]; { P high word }
@@1:
MOV ES, AX;
CMP AX, DX; { Check for match }
JE @@2;
ADD AX, ES:[BX].TCache.Size; { Move to next cache }
CMP AX, HeapEnd.Word[2];
JE @@2; { Are we at heap end }
PUSH ES;
INC CX; { No so try next }
JMP @@1;
@@2:
PUSH ES;
LES DI, ES:[BX].TCache.Master; { Pointe to master }
XOR AX, AX;
CLD;
STOSW; { Clear master ptr }
STOSW;
POP ES;
MOV AX, ES:[BX].TCache.Size; { Next cache }
JCXZ @@4;
@@3:
POP DX;
PUSH DS;
PUSH CX; { Hold registers }
MOV DS, DX;
ADD DX, AX;
MOV ES, DX;
MOV SI, DS:[BX].TCache.Size; { Get cache size }
MOV CL, 3;
SHL SI, CL; { Multiply x8 }
MOV CX, SI;
SHL SI, 1;
DEC SI; { Adjust position }
DEC SI;
MOV DI, SI;
STD;
REP MOVSW; { Move cache memory }
LDS SI, ES:[BX].TCache.Master;
MOV DS:[SI].Word[2], ES; { Store new master }
POP CX;
POP DS; { Recover registers }
LOOP @@3;
@@4:
ADD CachePtr.Word[2], AX; { Add offset }
END;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
VAR Cache, C: PCache;
BEGIN
{$ifdef fpc}
Cache:=pointer(p)-SizeOf(TCache);
{$else fpc}
PtrRec(Cache).Ofs := PtrRec(P).Ofs-SizeOf(TCache); { Previous cache }
PtrRec(Cache).Seg := PtrRec(P).Seg; { Segment }
{$endif fpc}
C := CacheList; { Start at 1st cache }
While (C^.Next <> Cache) AND (C^.Next <> CacheList)
Do C := C^.Next; { Find previous }
If (C^.Next = Cache) Then Begin { Cache found }
If (C = Cache) Then CacheList := Nil Else Begin { Only cache in list }
If CacheList = Cache Then CacheList := C; { First in list }
C^.Next := Cache^.Next; { Remove from list }
End;
Cache^.Master^ := Nil; { Clear master }
FreeMem(Cache, Cache^.Size); { Release memory }
End;
END;
{$ENDIF}
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ BUFFER MEMORY ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ GetBufferSize -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION GetBufferSize (P: Pointer): Word;
BEGIN
{$IFDEF PROC_REAL} { DOS CODE }
Dec(PtrRec(P).Seg); { Segment prior }
GetBufferSize := PBuffer(P)^.Size; { Size of this buffer }
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
If (P <> Nil) Then { Check pointer }
Begin
{$ifdef fpc}
Dec(Pointer(P),SizeOf(TBuffer)); { Correct to buffer }
{$else fpc}
Dec(PtrRec(P).Ofs,SizeOf(TBuffer)); { Correct to buffer }
{$endif fpc}
GetBufferSize := PBuffer(P)^.Size; { Return buffer size }
End
Else
GetBufferSize := 0; { Invalid pointer }
{$ENDIF}
END;
{---------------------------------------------------------------------------}
{ SetBufferSize -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
FUNCTION SetBufferSize (var P: Pointer; Size: Word): Boolean;
VAR NewSize: Word;
BEGIN
SetBufferSize := False; { Preset failure }
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
Dec(PtrRec(P).Seg); { Prior segment }
NewSize := (Size + 15) SHR 4 + 1; { Paragraph size }
If (BufHeapPtr+NewSize-GetBufSize(P)<=BufHeapEnd) { Check enough heap }
Then Begin
SetBufSize(P, NewSize); { Set the buffer size }
PBuffer(P)^.Size := Size; { Set the size }
SetBufferSize := True; { Return success }
End;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
{$ifdef fpc}
Dec(Pointer(P),SizeOf(TBuffer)); { Correct to buffer }
SetBufferSize := ReAllocMem(P, Size + SizeOf(TBuffer)) <> nil;
if SetBufferSize then
TBuffer(P^).Size := Size + SizeOf(TBuffer);
Inc(Pointer(P), SizeOf(TBuffer)); { Correct to buffer }
{$endif fpc}
{$ENDIF}
END;
{---------------------------------------------------------------------------}
{ DisposeBuffer -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE DisposeBuffer (P: Pointer);
{$IFNDEF PROC_REAL} VAR Buffer,PrevBuf: PBuffer; {$ENDIF}
BEGIN
If (P <> Nil) Then Begin
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
Dec(PtrRec(P).Seg); { Prior segement }
SetBufSize(P, 0); { Release memory }
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
{$ifdef fpc}
Dec(Pointer(P), SizeOf(TBuffer)); { Actual buffer pointer }
{$else fpc}
Dec(PtrRec(P).Ofs, SizeOf(TBuffer)); { Actual buffer pointer }
{$endif fpc}
Buffer := BufferList; { Start on first }
PrevBuf := Nil; { Preset prevbuf to nil }
While (Buffer <> Nil) AND (P <> Buffer) Do Begin { Search for buffer }
PrevBuf := Buffer; { Hold last buffer }
Buffer := Buffer^.Next; { Move to next buffer }
End;
If (Buffer <> Nil) Then Begin { Buffer was found }
If (PrevBuf = Nil) Then { We were first on list }
BufferList := Buffer^.Next Else { Set bufferlist entry }
PrevBuf^.Next := Buffer^.Next; { Remove us from chain }
FreeMem(Buffer, Buffer^.Size); { Release buffer }
End;
{$ENDIF}
End;
END;
{---------------------------------------------------------------------------}
{ NewBuffer -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE NewBuffer (Var P: Pointer; Size: Word);
VAR BufSize: Word; Buffer: PBuffer;
BEGIN
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
BufSize := (Size + 15) SHR 4 + 1; { Paragraphs to alloc }
If (BufHeapPtr+BufSize > BufHeapEnd) Then P := Nil { Exceeeds heap }
Else Begin
Buffer := Ptr(BufHeapPtr, 0); { Current position }
Buffer^.Size := Size; { Set size }
Buffer^.Master := @PtrRec(P).Seg; { Set master }
P := Ptr(BufHeapPtr + 1, 0); { Position ptr }
Inc(BufHeapPtr, BufSize); { Allow space on heap }
End;
{$ELSE} { DPMI/WIN/NT/OS2 CODE }
BufSize := Size + SizeOf(TBuffer); { Size to allocate }
Buffer := MemAlloc(BufSize); { Allocate the memory }
If (Buffer <> Nil) Then Begin
Buffer^.Next := BufferList; { First part of chain }
BufferList := Buffer; { Complete the chain }
Buffer^.Size := BufSize; { Hold the buffer size }
{$ifdef fpc}
Inc(Pointer(Buffer), SizeOf(TBuffer)); { Buffer to data area }
{$else fpc}
Inc(PtrRec(Buffer).Ofs, SizeOf(TBuffer)); { Buffer to data area }
{$endif fpc}
End;
P := Buffer; { Return the buffer ptr }
{$ENDIF}
END;
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{ DOS MEMORY CONTROL ROUTINES }
{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++}
{---------------------------------------------------------------------------}
{ InitDosMem -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE InitDosMem;
BEGIN
{$IFDEF PROC_REAL} { REAl MODE DOS CODE }
SetMemTop(Ptr(BufHeapEnd, 0)); { Move heap to empty }
{$ENDIF}
END;
{---------------------------------------------------------------------------}
{ DoneDosMem -> Platforms DOS/DPMI/WIN/NT/OS2 - Updated 01Oct99 LdB }
{---------------------------------------------------------------------------}
PROCEDURE DoneDosMem;
{$IFDEF PROC_REAL} VAR MemTop: Pointer; {$ENDIF}
BEGIN
{$IFDEF PROC_REAL} { REAL MODE DOS CODE }
MemTop := Ptr(BufHeapPtr, 0); { Top of memory }
If (BufHeapPtr = PtrRec(HeapEnd).Seg) Then Begin { Is memory empty }
FreeCacheMem; { Release memory }
MemTop := HeapPtr; { Set pointer }
End;
SetMemTop(MemTop); { Release memory }
{$ENDIF}
END;
END.