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650 lines
12 KiB
ObjectPascal
650 lines
12 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1993-98 by Florian Klaempfl
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Routines to read/write ppu files
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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 ppu;
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interface
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const
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{ buffer sizes }
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maxentrysize = 1024;
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{$ifdef TP}
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ppubufsize = 1024;
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{$else}
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ppubufsize = 16384;
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{$endif}
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{ppu entries}
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ibunitname = 1;
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ibsourcefile = 2;
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ibloadunit_int = 3;
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ibloadunit_imp = 4;
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ibinitunit = 5;
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iblinkofile = 6;
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ibsharedlibs = 7;
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ibstaticlibs = 8;
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ibdbxcount = 9;
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ibref = 10;
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ibentry = 254;
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ibend = 255;
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{syms}
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ibtypesym = 20;
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ibprocsym = 21;
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ibvarsym = 22;
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ibconstsym = 23;
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ibenumsym = 24;
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ibtypedconstsym = 25;
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ibabsolutesym = 26;
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ibpropertysym = 27;
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{defenitions}
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iborddef = 40;
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ibpointerdef = 41;
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ibarraydef = 42;
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ibprocdef = 43;
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ibstringdef = 44;
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ibrecorddef = 45;
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ibfiledef = 46;
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ibformaldef = 47;
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ibobjectdef = 48;
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ibenumdef = 49;
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ibsetdef = 50;
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ibprocvardef = 51;
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ibfloatdef = 52;
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ibextsymref = 53;
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ibextdefref = 54;
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ibclassrefdef = 55;
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iblongstringdef = 56;
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ibansistringdef = 57;
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ibwidestringdef = 58;
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{ unit flags }
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uf_init = $1;
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uf_uses_dbx = $2;
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uf_uses_browser = $4;
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uf_big_endian = $8;
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uf_in_library = $10;
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uf_shared_library = $20;
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uf_smartlink = $40;
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type
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tppuerror=(ppuentrytoobig,ppuentryerror);
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tppuheader=packed record
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id : array[1..3] of char; { = 'PPU' }
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ver : array[1..3] of char;
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compiler : word;
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target : word;
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flags : longint;
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size : longint;
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checksum : longint;
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end;
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tppuentry=packed record
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id : byte;
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nr : byte;
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size : word;
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end;
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pppufile=^tppufile;
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tppufile=object
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f : file;
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error,
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writing : boolean;
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fname : string;
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fsize : longint;
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header : tppuheader;
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size,crc : longint;
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do_crc,
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change_endian : boolean;
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buf : pchar;
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bufstart,
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bufsize,
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bufidx : longint;
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entry : tppuentry;
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entrystart,
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entryidx : longint;
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constructor init(fn:string);
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destructor done;
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procedure flush;
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procedure close;
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function CheckPPUId:boolean;
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function GetPPUVersion:longint;
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procedure NewHeader;
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procedure NewEntry;
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function EndOfEntry:boolean;
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{read}
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function open:boolean;
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procedure reloadbuf;
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procedure readdata(var b;len:longint);
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function readentry:byte;
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procedure getdata(var b;len:longint);
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function getbyte:byte;
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function getword:word;
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function getlongint:longint;
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function getstring:string;
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{write}
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function create:boolean;
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procedure writeheader;
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procedure writebuf;
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procedure writedata(var b;len:longint);
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procedure writeentry(ibnr:byte);
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procedure putdata(var b;len:longint);
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procedure putbyte(b:byte);
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procedure putword(w:word);
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procedure putlongint(l:longint);
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procedure putstring(s:string);
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end;
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implementation
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{*****************************************************************************
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Crc 32
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*****************************************************************************}
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var
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Crc32Tbl : array[0..255] of longint;
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procedure MakeCRC32Tbl;
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var
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crc : longint;
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i,n : byte;
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begin
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for i:=0 to 255 do
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begin
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crc:=i;
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for n:=1 to 8 do
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if odd(crc) then
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crc:=(crc shr 1) xor $edb88320
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else
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crc:=crc shr 1;
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Crc32Tbl[i]:=crc;
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end;
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end;
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{CRC 32}
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Function Crc32(Const HStr:String):longint;
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var
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i,InitCrc : longint;
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begin
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if Crc32Tbl[1]=0 then
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MakeCrc32Tbl;
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InitCrc:=$ffffffff;
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for i:=1to Length(Hstr) do
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InitCrc:=Crc32Tbl[byte(InitCrc) xor ord(Hstr[i])] xor (InitCrc shr 8);
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Crc32:=InitCrc;
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end;
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Function UpdateCrc32(InitCrc:longint;var InBuf;InLen:Longint):longint;
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var
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i : word;
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p : pchar;
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begin
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if Crc32Tbl[1]=0 then
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MakeCrc32Tbl;
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p:=@InBuf;
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for i:=1to InLen do
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begin
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InitCrc:=Crc32Tbl[byte(InitCrc) xor byte(p^)] xor (InitCrc shr 8);
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inc(longint(p));
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end;
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UpdateCrc32:=InitCrc;
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end;
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Function UpdCrc32(InitCrc:longint;b:byte):longint;
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begin
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if Crc32Tbl[1]=0 then
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MakeCrc32Tbl;
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UpdCrc32:=Crc32Tbl[byte(InitCrc) xor b] xor (InitCrc shr 8);
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end;
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{*****************************************************************************
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TPPUFile
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*****************************************************************************}
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constructor tppufile.init(fn:string);
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begin
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fname:=fn;
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change_endian:=false;
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writing:=false;
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NewHeader;
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getmem(buf,ppubufsize);
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end;
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destructor tppufile.done;
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begin
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close;
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freemem(buf,ppubufsize);
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end;
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procedure tppufile.flush;
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begin
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if writing then
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writebuf;
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end;
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procedure tppufile.close;
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var
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i : word;
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begin
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Flush;
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{$I-}
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system.close(f);
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{$I+}
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i:=ioresult;
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end;
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function tppufile.CheckPPUId:boolean;
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begin
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CheckPPUId:=((Header.Id[1]='P') and (Header.Id[2]='P') and (Header.Id[3]='U'));
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end;
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function tppufile.GetPPUVersion:longint;
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var
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l : longint;
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code : word;
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begin
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Val(header.ver[1]+header.ver[2]+header.ver[3],l,code);
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if code=0 then
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GetPPUVersion:=l
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else
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GetPPUVersion:=0;
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end;
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procedure tppufile.NewHeader;
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begin
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fillchar(header,sizeof(tppuheader),0);
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with header do
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begin
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Id[1]:='P';
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Id[2]:='P';
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Id[3]:='U';
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Ver[1]:='0';
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Ver[2]:='1';
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Ver[3]:='5';
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end;
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end;
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procedure tppufile.NewEntry;
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begin
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with entry do
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begin
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id:=ibentry;
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nr:=ibend;
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size:=0;
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end;
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entryidx:=0;
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end;
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function tppufile.endofentry:boolean;
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begin
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endofentry:=(entryidx>=entry.size);
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end;
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{*****************************************************************************
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TPPUFile Reading
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*****************************************************************************}
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function tppufile.open:boolean;
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var
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ofmode : byte;
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i : word;
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begin
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open:=false;
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assign(f,fname);
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ofmode:=filemode;
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filemode:=$0;
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{$I-}
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reset(f,1);
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{$I+}
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filemode:=ofmode;
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if ioresult<>0 then
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exit;
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{read ppuheader}
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fsize:=filesize(f);
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if fsize<sizeof(tppuheader) then
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exit;
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blockread(f,header,sizeof(tppuheader),i);
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{reset buffer}
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bufstart:=i;
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bufsize:=0;
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writing:=false;
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open:=true;
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end;
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procedure tppufile.reloadbuf;
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{$ifdef TP}
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var
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i : word;
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{$endif}
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begin
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inc(bufstart,bufsize);
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{$ifdef TP}
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blockread(f,buf,ppubufsize,i);
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bufsize:=i;
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{$else}
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blockread(f,buf,ppubufsize,bufsize);
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{$endif}
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bufidx:=0;
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end;
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procedure tppufile.readdata(var b;len:longint);
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var
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p : pchar;
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left,
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idx : longint;
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begin
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p:=pchar(@b);
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idx:=0;
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while len>0 do
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begin
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left:=bufsize-bufidx;
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if len>left then
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begin
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move(buf[bufidx],p[idx],left);
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dec(len,left);
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inc(idx,left);
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reloadbuf;
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if bufsize=0 then
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exit;
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end
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else
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begin
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move(buf[bufidx],p[idx],len);
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inc(bufidx,len);
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exit;
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end;
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end;
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end;
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function tppufile.readentry:byte;
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begin
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readdata(entry,sizeof(tppuentry));
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if entry.id<>ibentry then
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begin
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error:=true;
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exit;
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end;
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readentry:=entry.nr;
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entryidx:=0;
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end;
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procedure tppufile.getdata(var b;len:longint);
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begin
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if entryidx+len>entry.size then
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begin
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error:=true;
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exit;
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end;
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readdata(b,len);
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inc(entryidx,len);
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end;
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function tppufile.getbyte:byte;
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var
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b : byte;
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begin
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if entryidx+1>entry.size then
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begin
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error:=true;
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exit;
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end;
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{ if bufidx+1>bufsize then
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getbyte:=ord(buf[bufidx]);
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inc(bufidx);}
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readdata(b,1);
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getbyte:=b;
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inc(entryidx);
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end;
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function tppufile.getword:word;
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type
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pword = ^word;
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var
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w : word;
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begin
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if entryidx+2>entry.size then
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begin
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error:=true;
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exit;
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end;
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{ getword:=pword(@entrybuf[entrybufidx])^;}
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readdata(w,2);
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getword:=w;
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inc(entryidx,2);
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end;
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function tppufile.getlongint:longint;
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type
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plongint = ^longint;
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var
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l : longint;
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begin
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if entryidx+4>entry.size then
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begin
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error:=true;
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exit;
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end;
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readdata(l,4);
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getlongint:=l;
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{
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getlongint:=plongint(@entrybuf[entrybufidx])^;}
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inc(entryidx,4);
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end;
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function tppufile.getstring:string;
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var
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s : string;
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begin
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s[0]:=chr(getbyte);
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if entryidx+length(s)>entry.size then
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begin
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error:=true;
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exit;
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end;
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ReadData(s[1],length(s));
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getstring:=s;
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{ move(entrybuf[entrybufidx],s[1],length(s));}
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inc(entryidx,length(s));
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end;
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{*****************************************************************************
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TPPUFile Writing
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*****************************************************************************}
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function tppufile.create:boolean;
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begin
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create:=false;
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assign(f,fname);
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{$I-}
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rewrite(f,1);
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{$I+}
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if ioresult<>0 then
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exit;
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{write header for sure}
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blockwrite(f,header,sizeof(tppuheader));
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bufsize:=ppubufsize;
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{reset}
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crc:=$ffffffff;
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do_crc:=true;
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size:=0;
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writing:=true;
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create:=true;
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end;
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procedure tppufile.writeheader;
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var
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opos : longint;
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begin
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writebuf;
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opos:=filepos(f);
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seek(f,0);
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blockwrite(f,header,sizeof(tppuheader));
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seek(f,opos);
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end;
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procedure tppufile.writebuf;
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begin
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if do_crc then
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UpdateCrc32(crc,buf,bufidx);
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blockwrite(f,buf,bufidx);
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inc(bufstart,bufidx);
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bufidx:=0;
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end;
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procedure tppufile.writedata(var b;len:longint);
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var
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p : pchar;
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left,
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idx : longint;
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begin
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p:=pchar(@b);
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idx:=0;
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while len>0 do
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begin
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left:=bufsize-bufidx;
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if len>left then
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begin
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move(p[idx],buf[bufidx],left);
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dec(len,left);
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inc(idx,left);
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writebuf;
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end
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else
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begin
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move(p[idx],buf[bufidx],len);
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inc(bufidx,len);
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exit;
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end;
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end;
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end;
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procedure tppufile.writeentry(ibnr:byte);
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var
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opos : longint;
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begin
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{create entry}
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entry.id:=ibentry;
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entry.nr:=ibnr;
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entry.size:=entryidx;
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{flush}
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writebuf;
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{write entry}
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opos:=filepos(f);
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seek(f,entrystart);
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blockwrite(f,entry,sizeof(tppuentry));
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seek(f,opos);
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entrystart:=opos; {next entry position}
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{Add New Entry, which is ibend by default}
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NewEntry;
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writedata(entry,sizeof(tppuentry));
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end;
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procedure tppufile.putdata(var b;len:longint);
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begin
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writedata(b,len);
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inc(entryidx,len);
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end;
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procedure tppufile.putbyte(b:byte);
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begin
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writedata(b,1);
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{
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entrybuf[entrybufidx]:=chr(b);}
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inc(entryidx);
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end;
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procedure tppufile.putword(w:word);
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type
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pword = ^word;
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begin
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if change_endian then
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w:=swap(w);
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{ pword(@entrybuf[entrybufidx])^:=w;}
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writedata(w,2);
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inc(entryidx,2);
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end;
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procedure tppufile.putlongint(l:longint);
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type
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plongint = ^longint;
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begin
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{ plongint(@entrybuf[entrybufidx])^:=l;}
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if change_endian then
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l:=swap(l shr 16) or (longint(swap(l and $ffff)) shl 16);
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writedata(l,4);
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|
inc(entryidx,4);
|
|
end;
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|
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|
|
procedure tppufile.putstring(s:string);
|
|
begin
|
|
writedata(s,length(s)+1);
|
|
{ move(s,entrybuf[entrybufidx],length(s)+1);}
|
|
inc(entryidx,length(s)+1);
|
|
end;
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|
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.1 1998-05-12 10:56:07 peter
|
|
+ the ppufile object unit
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|
|
|
} |