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//----------------------------------------------------------------------------
// Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
// and Clark Cooper
// Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Expat maintainers.
//
// Expat - Version 2.0.0 Release Milano 0.83 (PasExpat 2.0.0 RM0.83)
// Pascal Port By: Milan Marusinec alias Milano
// milan@marusinec.sk
// http://www.pasports.org/pasexpat
// Copyright (c) 2006
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// [Pascal Port History] -----------------------------------------------------
//
// 10.05.2006-Milano: Unit port establishment
//
{ expat_basics.pas }
unit
expat_basics ;
INTERFACE
{$I expat_mode.inc }
{ GLOBAL PROCEDURES }
function expat_getmem (var ptr : pointer; sz : integer ) : boolean;
function expat_realloc(var ptr : pointer; old ,sz : integer ) : boolean;
function expat_freemem(var ptr : pointer; sz : integer ) : boolean;
procedure NoP;
// SHR for signed integers is differently implemented in pascal compilers
// than in c++ compilers. On the assembler level, c++ is using the SAR and
// pascal is using SHR. That gives completely different result, when the
// number is negative. We have to be compatible with c++ implementation,
// thus instead of directly using SHR we emulate c++ solution.
function shr_int8 (i ,shift : shortint ) : shortint;
function shr_int16(i ,shift : smallint ) : smallint;
function shr_int32(i ,shift : longint ) : longint;
IMPLEMENTATION
{ LOCAL VARIABLES & CONSTANTS }
{ UNIT IMPLEMENTATION }
{ EXPAT_GETMEM }
function expat_getmem;
begin
result:=false;
try
getmem(ptr ,sz );
{$IFDEF EXPAT_CLEARMEM}
FillByte(ptr^,sz,0);
{$ENDIF}
result:=true;
except
ptr:=NIL;
end;
end;
{ EXPAT_REALLOC }
function expat_realloc;
var
nb : pointer;
max : integer;
begin
if expat_getmem(nb ,sz ) then
begin
max:=old;
if max > sz then
max:=sz;
move(ptr^ ,nb^ ,max );
expat_freemem(ptr ,old );
ptr :=nb;
result:=true;
end
else
result:=false;
end;
{ EXPAT_FREEMEM }
function expat_freemem;
begin
if ptr = NIL then
result:=true
else
try
freemem(ptr ,sz );
ptr :=NIL;
result:=true;
except
result:=false;
end;
end;
{ NOP }
procedure NoP;
begin
end;
{ SHR_INT8 }
function shr_int8;
begin
{$IFDEF EXPAT_CPU_386 }
asm
mov al ,byte ptr [i ]
mov cl ,byte ptr [shift ]
sar al ,cl
mov byte ptr [result ] ,al
end;
{$ENDIF }
{$IFDEF EXPAT_CPU_PPC }
asm
lbz r2,i
extsb r2,r2
lbz r3,shift
extsb r3,r3
sraw r2,r2,r3
extsb r2,r2
stb r2,result
end;
{$ENDIF }
end;
{ SHR_INT16 }
function shr_int16;
begin
{$IFDEF EXPAT_CPU_386 }
asm
mov ax ,word ptr [i ]
mov cx ,word ptr [shift ]
sar ax ,cl
mov word ptr [result ] ,ax
end;
{$ENDIF }
{$IFDEF EXPAT_CPU_PPC }
asm
lha r2,i
lha r3,shift
sraw r2,r2,r3
extsh r2,r2
sth r2,result
end;
{$ENDIF }
end;
{ SHR_INT32 }
function shr_int32;
begin
{$IFDEF EXPAT_CPU_386 }
asm
mov eax ,dword ptr [i ]
mov ecx ,dword ptr [shift ]
sar eax ,cl
mov dword ptr [result ] ,eax
end;
{$ENDIF }
{$IFDEF EXPAT_CPU_PPC }
asm
lwz r3,i
lwz r2,shift
sraw r3,r3,r2
stw r3,result
end;
{$ENDIF }
end;
END.
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