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101 lines
2.5 KiB
ObjectPascal
101 lines
2.5 KiB
ObjectPascal
{
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Copyright (c) 2022 by Jonas Maebe
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Target OS version comparisons
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit versioncmp;
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{$i fpcdefs.inc}
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interface
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type
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tversion = object
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private
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fstr: string;
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fnum: cardinal;
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public
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{ initialise with string and numerical representation of the version }
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constructor init(const str: string; major: byte; minor: word; patch: byte);
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constructor invalidate;
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function relationto(const other: tversion): shortint;
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function relationto(major: byte; minor: word; patch: byte): shortint;
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function isvalid: boolean;
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property str: string read fstr;
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private
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function tonum(major: byte; minor: word; patch: byte): cardinal; inline;
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end;
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implementation
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function tversion.tonum(major: byte; minor: word; patch: byte): cardinal;
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begin
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result:=(major shl 24) or (minor shl 8) or patch;
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end;
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constructor tversion.init(const str: string; major: byte; minor: word; patch: byte);
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begin
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fstr:=str;
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fnum:=tonum(major,minor,patch);
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end;
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constructor tversion.invalidate;
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begin
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fstr:='';
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fnum:=0;
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end;
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function tversion.relationto(const other: tversion): shortint;
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begin
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if fnum>other.fnum then
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result:=1
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else if fnum<other.fnum then
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result:=-1
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else
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result:=0;
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end;
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function tversion.relationto(major: byte; minor: word; patch: byte): shortint;
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var
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othernum: cardinal;
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begin
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othernum:=tonum(major,minor,patch);
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if fnum>othernum then
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result:=1
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else if fnum<othernum then
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result:=-1
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else
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result:=0;
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end;
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function tversion.isvalid: boolean;
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begin
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result:=fstr<>'';
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end;
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end.
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