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{
Copyright (c) 2013-2016 by Free Pascal development team
Routines to read/write pcp files
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit pcp;
{$i fpcdefs.inc}
{$H+}
interface
uses
cstreams,entfile;
const
CurrentPCPVersion=3;
{ unit flags }
//uf_init = $000001; { unit has initialization section }
//uf_finalize = $000002; { unit has finalization section }
pf_big_endian = $000004;
//uf_has_browser = $000010;
//uf_in_library = $000020; { is the file in another file than <ppufile>.* ? }
//uf_smart_linked = $000040; { the ppu can be smartlinked }
//uf_static_linked = $000080; { the ppu can be linked static }
//uf_shared_linked = $000100; { the ppu can be linked shared }
//uf_local_browser = $000200;
//uf_no_link = $000400; { unit has no .o generated, but can still have external linking! }
//uf_has_resourcestrings = $000800; { unit has resource string section }
pf_little_endian = $001000;
type
tpcpheader=record
common : tentryheader;
checksum : cardinal; { checksum for this pcpfile }
requiredlistsize, { number of entries for required packages }
ppulistsize : longint; { number of entries for contained PPUs }
end;
tpcpfile=class(tentryfile)
public
header : tpcpheader;
{ crc for the entire package }
crc : cardinal;
do_crc : boolean;
protected
function getheadersize:longint;override;
function getheaderaddr:pentryheader;override;
procedure newheader;override;
function readheader:longint;override;
procedure resetfile;override;
procedure RaiseAssertion(Code: Longint); override;
public
procedure writeheader;override;
function checkpcpid:boolean;
procedure putdata(const b;len:integer);override;
end;
implementation
uses
fpccrc;
{ tpcpfile }
function tpcpfile.getheadersize: longint;
begin
result:=sizeof(tpcpheader);
end;
function tpcpfile.getheaderaddr: pentryheader;
begin
result:=@header;
end;
procedure tpcpfile.RaiseAssertion(Code: Longint);
begin
// InternalError(nb);
inherited RaiseAssertion(Code);
end;
procedure tpcpfile.newheader;
var
s : string;
begin
fillchar(header,sizeof(tpcpheader),0);
str(CurrentPCPVersion,s);
while length(s)<3 do
s:='0'+s;
with header.common do
begin
id[1]:='P';
id[2]:='C';
id[3]:='P';
ver[1]:=s[1];
ver[2]:=s[2];
ver[3]:=s[3];
end;
end;
function tpcpfile.readheader: longint;
begin
if fsize<sizeof(tpcpheader) then
exit(0);
result:=f.Read(header,sizeof(tpcpheader));
{ The header is always stored in little endian order }
{ therefore swap if on a big endian machine }
{$IFDEF ENDIAN_BIG}
header.common.compiler := swapendian(header.common.compiler);
header.common.cpu := swapendian(header.common.cpu);
header.common.target := swapendian(header.common.target);
header.common.flags := swapendian(header.common.flags);
header.common.size := swapendian(header.common.size);
header.checksum := swapendian(header.checksum);
header.requiredlistsize:=swapendian(header.requiredlistsize);
header.ppulistsize:=swapendian(header.ppulistsize);
{$ENDIF}
{ the PPU DATA is stored in native order }
if (header.common.flags and pf_big_endian) = pf_big_endian then
Begin
{$IFDEF ENDIAN_LITTLE}
change_endian := TRUE;
{$ELSE}
change_endian := FALSE;
{$ENDIF}
End
else if (header.common.flags and pf_little_endian) = pf_little_endian then
Begin
{$IFDEF ENDIAN_BIG}
change_endian := TRUE;
{$ELSE}
change_endian := FALSE;
{$ENDIF}
End;
end;
procedure tpcpfile.resetfile;
begin
crc:=0;
do_crc:=true;
end;
procedure tpcpfile.writeheader;
var
opos : integer;
begin
{ flush buffer }
writebuf;
{ update size (w/o header!) in the header }
header.common.size:=bufstart-sizeof(tpcpheader);
{ set the endian flag }
{$ifndef FPC_BIG_ENDIAN}
header.common.flags:=header.common.flags or pf_little_endian;
{$else not FPC_BIG_ENDIAN}
header.common.flags:=header.common.flags or pf_big_endian;
{ Now swap the header in the correct endian (always little endian) }
header.common.compiler:=swapendian(header.common.compiler);
header.common.cpu:=swapendian(header.common.cpu);
header.common.target:=swapendian(header.common.target);
header.common.flags:=swapendian(header.common.flags);
header.common.size:=swapendian(header.common.size);
header.checksum:=swapendian(header.checksum);
header.requiredlistsize:=swapendian(header.requiredlistsize);
header.ppulistsize:=swapendian(header.ppulistsize);
{$endif not FPC_BIG_ENDIAN}
{ write header and restore filepos after it }
opos:=f.Position;
f.Position:=0;
f.Write(header,sizeof(tpcpheader));
f.Position:=opos;
end;
function tpcpfile.checkpcpid:boolean;
begin
result:=((Header.common.Id[1]='P') and
(Header.common.Id[2]='C') and
(Header.common.Id[3]='P'));
end;
procedure tpcpfile.putdata(const b;len:integer);
begin
if do_crc then
begin
crc:=UpdateCrc32(crc,b,len);
end;
inherited putdata(b, len);
end;
end.
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